/*
* tkImgPhoto.c --
*
* Implements images of type "photo" for Tk. Photo images are
* stored in full color (32 bits per pixel) and displayed using
* dithering if necessary.
*
* Copyright (c) 1994 The Australian National University.
* Copyright (c) 1994-1997 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* RCS: @(#) $Id: tkImgPhoto.c,v 1.4 1999/02/04 21:43:14 stanton Exp $
*/
#include "tkInt.h"
#include "tkPort.h"
#include "tclMath.h"
/*
* Declaration for internal Xlib function used here:
*/
extern int _XInitImageFuncPtrs _ANSI_ARGS_((XImage *image));
#include "tkVMacro.h"
#include "tkImgPhoto.h"
#include <math.h>
#include <ctype.h>
/*
* A signed 8-bit integral type. If chars are unsigned and the compiler
* isn't an ANSI one, then we have to use short instead (which wastes
* space) to get signed behavior.
*/
#if defined(__STDC__) || defined(ANSI_SIGNED_CHAR) || defined(_AIX)
typedef signed char schar;
#else
# ifndef __CHAR_UNSIGNED__
typedef char schar;
# else
typedef short schar;
# endif
#endif
/*
* An unsigned 32-bit integral type, used for pixel values.
* We use int rather than long here to accommodate those systems
* where longs are 64 bits.
*/
typedef unsigned int pixel;
/*
* The maximum number of pixels to transmit to the server in a
* single XPutImage call.
*/
#define MAX_PIXELS 65536
/*
* The set of colors required to display a photo image in a window depends on:
* - the visual used by the window
* - the palette, which specifies how many levels of each primary
* color to use, and
* - the gamma value for the image.
*
* Pixel values allocated for specific colors are valid only for the
* colormap in which they were allocated. Sets of pixel values
* allocated for displaying photos are re-used in other windows if
* possible, that is, if the display, colormap, palette and gamma
* values match. A hash table is used to locate these sets of pixel
* values, using the following data structure as key:
*/
typedef struct {
Display *display; /* Qualifies the colormap resource ID */
Colormap colormap; /* Colormap that the windows are using. */
double gamma; /* Gamma exponent value for images. */
Tk_Uid palette; /* Specifies how many shades of each primary
* we want to allocate. */
} ColorTableId;
/*
* For a particular (display, colormap, palette, gamma) combination,
* a data structure of the following type is used to store the allocated
* pixel values and other information:
*/
typedef struct ColorTable {
ColorTableId id; /* Information used in selecting this
* color table. */
int flags; /* See below. */
int refCount; /* Number of instances using this map. */
int liveRefCount; /* Number of instances which are actually
* in use, using this map. */
int numColors; /* Number of colors allocated for this map. */
XVisualInfo visualInfo; /* Information about the visual for windows
* using this color table. */
pixel redValues[256]; /* Maps 8-bit values of red intensity
* to a pixel value or index in pixelMap. */
pixel greenValues[256]; /* Ditto for green intensity */
pixel blueValues[256]; /* Ditto for blue intensity */
unsigned long *pixelMap; /* Actual pixel values allocated. */
unsigned char colorQuant[3][256];
/* Maps 8-bit intensities to quantized
* intensities. The first index is 0 for
* red, 1 for green, 2 for blue. */
} ColorTable;
/*
* Bit definitions for the flags field of a ColorTable.
* BLACK_AND_WHITE: 1 means only black and white colors are
* available.
* TK_COLOR_WINDOW: 1 means a full 3-D color cube has been
* allocated.
* DISPOSE_PENDING: 1 means a call to DisposeColorTable has
* been scheduled as an idle handler, but it
* hasn't been invoked yet.
* MAP_COLORS: 1 means pixel values should be mapped
* through pixelMap.
*/
#define BLACK_AND_WHITE 1
#define TK_COLOR_WINDOW 2
#define DISPOSE_PENDING 4
#define MAP_COLORS 8
/*
* Definition of the data associated with each photo image master.
*/
typedef struct PhotoMaster {
Tk_ImageMaster tkMaster; /* Tk's token for image master. NULL means
* the image is being deleted. */
Tcl_Interp *interp; /* Interpreter associated with the
* application using this image. */
Tcl_Command imageCmd; /* Token for image command (used to delete
* it when the image goes away). NULL means
* the image command has already been
* deleted. */
int flags; /* Sundry flags, defined below. */
int width, height; /* Dimensions of image. */
int userWidth, userHeight; /* User-declared image dimensions. */
Tk_Uid palette; /* User-specified default palette for
* instances of this image. */
double gamma; /* Display gamma value to correct for. */
Tcl_Obj *fileString; /* Name of file to read into image. */
Tcl_Obj *dataString; /* Object to use as contents of image. */
Tcl_Obj *format; /* User-specified format of data in image
* file or string value. */
unsigned char *pix24; /* Local storage for 24-bit image. */
int ditherX, ditherY; /* Location of first incorrectly
* dithered pixel in image. */
TkRegion validRegion; /* Tk region indicating which parts of
* the image have valid image data. */
struct PhotoInstance *instancePtr;
/* First in the list of instances
* associated with this master. */
} PhotoMaster;
/*
* Bit definitions for the flags field of a PhotoMaster.
* COLOR_IMAGE: 1 means that the image has different color
* components.
* IMAGE_CHANGED: 1 means that the instances of this image
* need to be redithered.
*/
#define COLOR_IMAGE 1
#define IMAGE_CHANGED 2
/*
* The following data structure represents all of the instances of
* a photo image in windows on a given screen that are using the
* same colormap.
*/
typedef struct PhotoInstance {
PhotoMaster *masterPtr; /* Pointer to master for image. */
Display *display; /* Display for windows using this instance. */
Colormap colormap; /* The image may only be used in windows with
* this particular colormap. */
struct PhotoInstance *nextPtr;
/* Pointer to the next instance in the list
* of instances associated with this master. */
int refCount; /* Number of instances using this structure. */
Tk_Uid palette; /* Palette for these particular instances. */
double gamma; /* Gamma value for these instances. */
Tk_Uid defaultPalette; /* Default palette to use if a palette
* is not specified for the master. */
ColorTable *colorTablePtr; /* Pointer to information about colors
* allocated for image display in windows
* like this one. */
Pixmap pixels; /* X pixmap containing dithered image. */
int width, height; /* Dimensions of the pixmap. */
schar *error; /* Error image, used in dithering. */
XImage *imagePtr; /* Image structure for converted pixels. */
XVisualInfo visualInfo; /* Information about the visual that these
* windows are using. */
GC gc; /* Graphics context for writing images
* to the pixmap. */
} PhotoInstance;
/*
* The following data structure is used to return information
* from ParseSubcommandOptions:
*/
struct SubcommandOptions {
int options; /* Individual bits indicate which
* options were specified - see below. */
Tcl_Obj *name; /* Name specified without an option. */
int fromX, fromY; /* Values specified for -from option. */
int fromX2, fromY2; /* Second coordinate pair for -from option. */
int toX, toY; /* Values specified for -to option. */
int toX2, toY2; /* Second coordinate pair for -to option. */
int zoomX, zoomY; /* Values specified for -zoom option. */
int subsampleX, subsampleY; /* Values specified for -subsample option. */
Tcl_Obj *format; /* Value specified for -format option. */
XColor *background; /* Value specified for -background option. */
};
/*
* Bit definitions for use with ParseSubcommandOptions:
* Each bit is set in the allowedOptions parameter on a call to
* ParseSubcommandOptions if that option is allowed for the current
* photo image subcommand. On return, the bit is set in the options
* field of the SubcommandOptions structure if that option was specified.
*
* OPT_BACKGROUND: Set if -background option allowed/specified.
* OPT_FORMAT: Set if -format option allowed/specified.
* OPT_FROM: Set if -from option allowed/specified.
* OPT_GRAYSCALE: Set if -grayscale option allowed/specified.
* OPT_SHRINK: Set if -shrink option allowed/specified.
* OPT_SUBSAMPLE: Set if -subsample option allowed/spec'd.
* OPT_TO: Set if -to option allowed/specified.
* OPT_ZOOM: Set if -zoom option allowed/specified.
*/
#define OPT_BACKGROUND 1
#define OPT_FORMAT 2
#define OPT_FROM 4
#define OPT_GRAYSCALE 8
#define OPT_SHRINK 0x10
#define OPT_SUBSAMPLE 0x20
#define OPT_TO 0x40
#define OPT_ZOOM 0x80
/*
* List of option names. The order here must match the order of
* declarations of the OPT_* constants above.
*/
static char *optionNames[] = {
"-background",
"-format",
"-from",
"-grayscale",
"-shrink",
"-subsample",
"-to",
"-zoom",
(char *) NULL
};
/*
* The type record for photo images:
*/
static int ImgPhotoCreate _ANSI_ARGS_((Tcl_Interp *interp,
char *name, int argc, Tcl_Obj *objv[],
Tk_ImageType *typePtr, Tk_ImageMaster master,
ClientData *clientDataPtr));
static ClientData ImgPhotoGet _ANSI_ARGS_((Tk_Window tkwin,
ClientData clientData));
static void ImgPhotoDisplay _ANSI_ARGS_((ClientData clientData,
Display *display, Drawable drawable,
int imageX, int imageY, int width, int height,
int drawableX, int drawableY));
static void ImgPhotoFree _ANSI_ARGS_((ClientData clientData,
Display *display));
static void ImgPhotoDelete _ANSI_ARGS_((ClientData clientData));
Tk_ImageType tkPhotoImageType = {
"photo", /* name */
ImgPhotoCreate, /* createProc */
ImgPhotoGet, /* getProc */
ImgPhotoDisplay, /* displayProc */
ImgPhotoFree, /* freeProc */
ImgPhotoDelete, /* deleteProc */
(Tk_ImagePostscriptProc *) NULL, /* postscriptProc */
(Tk_ImageType *) NULL /* nextPtr */
};
/*
* Default configuration
*/
#define DEF_PHOTO_GAMMA "1"
#define DEF_PHOTO_HEIGHT "0"
#define DEF_PHOTO_PALETTE ""
#define DEF_PHOTO_WIDTH "0"
/*
* Information used for parsing configuration specifications:
*/
static Tk_ConfigSpec configSpecs[] = {
{TK_CONFIG_LANGARG, "-data", (char *) NULL, (char *) NULL,
(char *) NULL, Tk_Offset(PhotoMaster, dataString), TK_CONFIG_NULL_OK},
{TK_CONFIG_LANGARG, "-format", (char *) NULL, (char *) NULL,
(char *) NULL, Tk_Offset(PhotoMaster, format), TK_CONFIG_NULL_OK},
{TK_CONFIG_LANGARG, "-file", (char *) NULL, (char *) NULL,
(char *) NULL, Tk_Offset(PhotoMaster, fileString), TK_CONFIG_NULL_OK},
{TK_CONFIG_DOUBLE, "-gamma", "gamma", "Gamma",
DEF_PHOTO_GAMMA, Tk_Offset(PhotoMaster, gamma), 0},
{TK_CONFIG_INT, "-height", (char *) NULL, (char *) NULL,
DEF_PHOTO_HEIGHT, Tk_Offset(PhotoMaster, userHeight), 0},
{TK_CONFIG_UID, "-palette", "palette", "Palette",
DEF_PHOTO_PALETTE, Tk_Offset(PhotoMaster, palette), 0},
{TK_CONFIG_INT, "-width", (char *) NULL, (char *) NULL,
DEF_PHOTO_WIDTH, Tk_Offset(PhotoMaster, userWidth), 0},
{TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
(char *) NULL, 0, 0}
};
/*
* Hash table used to hash from (display, colormap, palette, gamma)
* to ColorTable address.
*/
static Tcl_HashTable imgPhotoColorHash;
static int imgPhotoColorHashInitialized;
#define N_COLOR_HASH (sizeof(ColorTableId) / sizeof(int))
/*
* Pointer to the first in the list of known photo image formats.
*/
static Tk_PhotoImageFormat *formatList = NULL;
/*
* Forward declarations
*/
static int ImgPhotoCmd _ANSI_ARGS_((ClientData clientData,
Tcl_Interp *interp, int argc, Tcl_Obj *objv[]));
static int ParseSubcommandOptions _ANSI_ARGS_((
struct SubcommandOptions *optPtr,
Tcl_Interp *interp, int allowedOptions,
int *indexPtr, int argc, Tcl_Obj *objv[]));
static void ImgPhotoCmdDeletedProc _ANSI_ARGS_((
ClientData clientData));
static int ImgPhotoConfigureMaster _ANSI_ARGS_((
Tcl_Interp *interp, PhotoMaster *masterPtr,
int argc, Tcl_Obj *CONST objv[], int flags));
static void ImgPhotoConfigureInstance _ANSI_ARGS_((
PhotoInstance *instancePtr));
static void ImgPhotoSetSize _ANSI_ARGS_((PhotoMaster *masterPtr,
int width, int height));
static void ImgPhotoInstanceSetSize _ANSI_ARGS_((
PhotoInstance *instancePtr));
static int ImgStringWrite _ANSI_ARGS_((Tcl_Interp *interp,
Tcl_DString *dataPtr, Tcl_Obj *formatString,
Tk_PhotoImageBlock *blockPtr));
static char * ImgGetPhoto _ANSI_ARGS_((PhotoMaster *masterPtr,
Tk_PhotoImageBlock *blockPtr,
struct SubcommandOptions *optPtr));
static int IsValidPalette _ANSI_ARGS_((PhotoInstance *instancePtr,
char *palette));
static int CountBits _ANSI_ARGS_((pixel mask));
static void GetColorTable _ANSI_ARGS_((PhotoInstance *instancePtr));
static void FreeColorTable _ANSI_ARGS_((ColorTable *colorPtr,
int force));
static void AllocateColors _ANSI_ARGS_((ColorTable *colorPtr));
static void DisposeColorTable _ANSI_ARGS_((ClientData clientData));
static void DisposeInstance _ANSI_ARGS_((ClientData clientData));
static int ReclaimColors _ANSI_ARGS_((ColorTableId *id,
int numColors));
static int MatchFileFormat _ANSI_ARGS_((Tcl_Interp *interp,
Tcl_Channel chan, Tcl_Obj *fileName, Tcl_Obj *formatString,
Tk_PhotoImageFormat **imageFormatPtr,
int *widthPtr, int *heightPtr));
static int MatchStringFormat _ANSI_ARGS_((Tcl_Interp *interp,
Tcl_Obj *data, Tcl_Obj *formatString,
Tk_PhotoImageFormat **imageFormatPtr,
int *widthPtr, int *heightPtr));
static Tcl_CmdProc * PhotoOptionFind _ANSI_ARGS_((Tcl_Interp * interp,
char *name));
static void DitherInstance _ANSI_ARGS_((PhotoInstance *instancePtr,
int x, int y, int width, int height));
#undef MIN
#define MIN(a, b) ((a) < (b)? (a): (b))
#undef MAX
#define MAX(a, b) ((a) > (b)? (a): (b))
/*
*----------------------------------------------------------------------
*
* Tk_CreatePhotoImageFormat --
*
* This procedure is invoked by an image file handler to register
* a new photo image format and the procedures that handle the
* new format. The procedure is typically invoked during
* Tcl_AppInit.
*
* Results:
* None.
*
* Side effects:
* The new image file format is entered into a table used in the
* photo image "read" and "write" subcommands.
*
*----------------------------------------------------------------------
*/
void
Tk_CreatePhotoImageFormat(formatPtr)
Tk_PhotoImageFormat *formatPtr;
/* Structure describing the format. All of
* the fields except "nextPtr" must be filled
* in by caller. Must not have been passed
* to Tk_CreatePhotoImageFormat previously. */
{
Tk_PhotoImageFormat *copyPtr;
copyPtr = (Tk_PhotoImageFormat *) ckalloc(sizeof(Tk_PhotoImageFormat));
*copyPtr = *formatPtr;
copyPtr->name = (char *) ckalloc((unsigned) (strlen(formatPtr->name) + 1));
strcpy(copyPtr->name, formatPtr->name);
copyPtr->nextPtr = formatList;
formatList = copyPtr;
}
/*
*----------------------------------------------------------------------
*
* ImgPhotoCreate --
*
* This procedure is called by the Tk image code to create
* a new photo image.
*
* Results:
* A standard Tcl result.
*
* Side effects:
* The data structure for a new photo image is allocated and
* initialized.
*
*----------------------------------------------------------------------
*/
static int
ImgPhotoCreate(interp, name, argc, objv, typePtr, master, clientDataPtr)
Tcl_Interp *interp; /* Interpreter for application containing
* image. */
char *name; /* Name to use for image. */
int argc; /* Number of arguments. */
Tcl_Obj *objv[]; /* Argument objects for options (doesn't
* include image name or type). */
Tk_ImageType *typePtr; /* Pointer to our type record (not used). */
Tk_ImageMaster master; /* Token for image, to be used by us in
* later callbacks. */
ClientData *clientDataPtr; /* Store manager's token for image here;
* it will be returned in later callbacks. */
{
PhotoMaster *masterPtr;
/*
* Allocate and initialize the photo image master record.
*/
masterPtr = (PhotoMaster *) ckalloc(sizeof(PhotoMaster));
memset((void *) masterPtr, 0, sizeof(PhotoMaster));
masterPtr->tkMaster = master;
masterPtr->interp = interp;
masterPtr->imageCmd = Lang_CreateImage(interp, name, ImgPhotoCmd,
(ClientData) masterPtr, ImgPhotoCmdDeletedProc, typePtr);
masterPtr->palette = NULL;
masterPtr->pix24 = NULL;
masterPtr->instancePtr = NULL;
masterPtr->validRegion = TkCreateRegion();
/*
* Process configuration options given in the image create command.
*/
if (ImgPhotoConfigureMaster(interp, masterPtr, argc, objv, 0) != TCL_OK) {
ImgPhotoDelete((ClientData) masterPtr);
return TCL_ERROR;
}
*clientDataPtr = (ClientData) masterPtr;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* ImgPhotoCmd --
*
* This procedure is invoked to process the Tcl command that
* corresponds to a photo image. See the user documentation
* for details on what it does.
*
* Results:
* A standard Tcl result.
*
* Side effects:
* See the user documentation.
*
*----------------------------------------------------------------------
*/
static int
ImgPhotoCmd(clientData, interp, argc, objv)
ClientData clientData; /* Information about photo master. */
Tcl_Interp *interp; /* Current interpreter. */
int argc; /* Number of arguments. */
Tcl_Obj *objv[]; /* Argument objects. */
{
PhotoMaster *masterPtr = (PhotoMaster *) clientData;
int c, result, index;
int x, y, width, height;
int dataWidth = 0, dataHeight;
struct SubcommandOptions options;
int listArgc;
Arg *listArgv;
Arg *srcArgv;
unsigned char *pixelPtr = NULL;
Tk_PhotoImageBlock block;
Tk_Window tkwin;
char string[16];
XColor color;
Tk_PhotoImageFormat *imageFormat;
int imageWidth, imageHeight;
int matched;
Tcl_Channel chan;
Tk_PhotoHandle srcHandle;
size_t length;
char *arg1;
static char **strv = NULL;
Tcl_Obj *obj;
int i;
if (argc < 2) {
Tcl_WrongNumArgs(interp, 1, objv, "option ?arg arg ...?");
return TCL_ERROR;
}
/* the static variable "argv" keeps its information until the
* next call of ImgPhotoCmd. This is not really neaded, but still
* done for 2 reasons:
* - Otherwise argv should be freed before each "return" in the next
* part. I'm too lazy to do that everywhere.
* - Because of the changes everywhere, a conflict with the dash-patch
* would arise. I don't want to release separate dash-patch versions
* for with and without this patch.
*
* Jan Nijtmans <Jan.Nijtmans@wxs.nl>
*/
if (strv) {
ckfree((char *) strv);
}
strv = (char **) ckalloc((argc+1) * sizeof(char *));
strv[argc] = NULL;
for (index = 0; index < argc; index++) {
strv[index] = Tcl_GetStringFromObj(objv[index], (int *) NULL);
}
c = strv[1][0];
length = strlen(arg1 = strv[1]);
/*
* End of porting code. Because all arguments are now available in both
* "strv" as "objv", the code after this can use whatever it likes.
*
*/
if ((c == 'b') && (strncmp(arg1, "blank", length) == 0)) {
/*
* photo blank command - just call Tk_PhotoBlank.
*/
if (argc == 2) {
Tk_PhotoBlank(masterPtr);
} else {
Tcl_WrongNumArgs(interp, 2, objv, (char *) NULL);
return TCL_ERROR;
}
} else if ((c == 'c') && (length >= 2)
&& (strncmp(arg1, "cget", length) == 0)) {
if (argc != 3) {
Tcl_WrongNumArgs(interp, 2, objv, "option");
return TCL_ERROR;
}
#ifndef _LANG
if (strncmp(strv[2],"-data", length) == 0) {
if (masterPtr->dataString) {
Tcl_SetObjResult(interp, masterPtr->dataString);
}
return TCL_OK;
}
if (strncmp(strv[2],"-format", length) == 0) {
if (masterPtr->format) {
Tcl_SetObjResult(interp, masterPtr->format);
}
return TCL_OK;
}
#endif
Tk_ConfigureValue(interp, Tk_MainWindow(interp), configSpecs,
(char *) masterPtr, strv[2], 0);
} else if ((c == 'c') && (length >= 3)
&& (strncmp(strv[1], "configure", length) == 0)) {
/*
* photo configure command - handle this in the standard way.
*/
if (argc == 2) {
Tcl_Obj *obj, *subobj;
result = Tk_ConfigureInfo(interp, Tk_MainWindow(interp),
configSpecs, (char *) masterPtr, (char *) NULL, 0);
if (result != TCL_OK) {
return result;
}
#ifndef _LANG
obj = Tcl_NewObj();
subobj = Tcl_NewStringObj("-data {} {} {}", 14);
if (masterPtr->dataString) {
Tcl_ListObjAppendElement(interp, subobj, masterPtr->dataString);
} else {
Tcl_AppendStringsToObj(subobj, " {}", (char *) NULL);
}
Tcl_ListObjAppendElement(interp, obj, subobj);
subobj = Tcl_NewStringObj("-format {} {} {}", 16);
if (masterPtr->format) {
Tcl_ListObjAppendElement(interp, subobj, masterPtr->format);
} else {
Tcl_AppendStringsToObj(subobj, " {}", (char *) NULL);
}
Tcl_ListObjAppendElement(interp, obj, subobj);
Tcl_ListObjAppendList(interp, obj, Tcl_GetObjResult(interp));
Tcl_SetObjResult(interp, obj);
#endif
return TCL_OK;
}
if (argc == 3) {
#ifndef _LANG
length = strlen(strv[2]);
if (!strncmp(strv[2], "-data", length)) {
Tcl_AppendStringsToObj(Tcl_GetObjResult(interp),
"-data {} {} {}", (char *) NULL);
if (masterPtr->dataString) {
Tcl_ListObjAppendElement(interp, Tcl_GetObjResult(interp),
masterPtr->dataString);
} else {
Tcl_AppendStringsToObj(Tcl_GetObjResult(interp),
" {}", (char *) NULL);
}
return TCL_OK;
} else if (!strncmp(strv[2], "-format", length)) {
Tcl_AppendStringsToObj(Tcl_GetObjResult(interp),
"-format {} {} {}", (char *) NULL);
if (masterPtr->format) {
Tcl_ListObjAppendElement(interp, Tcl_GetObjResult(interp),
masterPtr->format);
} else {
Tcl_AppendStringsToObj(Tcl_GetObjResult(interp),
" {}", (char *) NULL);
}
return TCL_OK;
} else {
#endif
return Tk_ConfigureInfo(interp, Tk_MainWindow(interp),
configSpecs, (char *) masterPtr, strv[2], 0);
#ifndef _LANG
}
#endif
}
return ImgPhotoConfigureMaster(interp, masterPtr, argc-2, objv+2,
TK_CONFIG_ARGV_ONLY);
} else if ((c == 'c') && (length >= 3)
&& (strncmp(arg1, "copy", length) == 0)) {
/*
* photo copy command - first parse options.
*/
index = 2;
memset((VOID *) &options, 0, sizeof(options));
options.zoomX = options.zoomY = 1;
options.subsampleX = options.subsampleY = 1;
options.name = NULL;
if (ParseSubcommandOptions(&options, interp,
OPT_FROM | OPT_TO | OPT_ZOOM | OPT_SUBSAMPLE | OPT_SHRINK,
&index, argc, objv) != TCL_OK) {
return TCL_ERROR;
}
if (options.name == NULL || index < argc) {
Tcl_WrongNumArgs(interp, 2, objv,
"source-image ?-from x1 y1 x2 y2? ?-to x1 y1 x2 y2? ?-zoom x y? ?-subsample x y?");
return TCL_ERROR;
}
/*
* Look for the source image and get a pointer to its image data.
* Check the values given for the -from option.
*/
if ((srcHandle = Tk_FindPhoto(interp, Tcl_GetStringFromObj(options.name, NULL))) == NULL) {
Tcl_AppendResult(interp, "image \"",
Tcl_GetStringFromObj(options.name, NULL), "\" doesn't",
" exist or is not a photo image", (char *) NULL);
return TCL_ERROR;
}
Tk_PhotoGetImage(srcHandle, &block);
if ((options.fromX2 > block.width) || (options.fromY2 > block.height)
|| (options.fromX2 > block.width)
|| (options.fromY2 > block.height)) {
Tcl_AppendResult(interp, "coordinates for -from option extend ",
"outside source image", (char *) NULL);
return TCL_ERROR;
}
/*
* Fill in default values for unspecified parameters.
*/
if (((options.options & OPT_FROM) == 0) || (options.fromX2 < 0)) {
options.fromX2 = block.width;
options.fromY2 = block.height;
}
if (((options.options & OPT_TO) == 0) || (options.toX2 < 0)) {
width = options.fromX2 - options.fromX;
if (options.subsampleX > 0) {
width = (width + options.subsampleX - 1) / options.subsampleX;
} else if (options.subsampleX == 0) {
width = 0;
} else {
width = (width - options.subsampleX - 1) / -options.subsampleX;
}
options.toX2 = options.toX + width * options.zoomX;
height = options.fromY2 - options.fromY;
if (options.subsampleY > 0) {
height = (height + options.subsampleY - 1)
/ options.subsampleY;
} else if (options.subsampleY == 0) {
height = 0;
} else {
height = (height - options.subsampleY - 1)
/ -options.subsampleY;
}
options.toY2 = options.toY + height * options.zoomY;
}
/*
* Set the destination image size if the -shrink option was specified.
*/
if (options.options & OPT_SHRINK) {
ImgPhotoSetSize(masterPtr, options.toX2, options.toY2);
}
/*
* Copy the image data over using Tk_PhotoPutZoomedBlock.
*/
block.pixelPtr += options.fromX * block.pixelSize
+ options.fromY * block.pitch;
block.width = options.fromX2 - options.fromX;
block.height = options.fromY2 - options.fromY;
Tk_PhotoPutZoomedBlock((Tk_PhotoHandle) masterPtr, &block,
options.toX, options.toY, options.toX2 - options.toX,
options.toY2 - options.toY, options.zoomX, options.zoomY,
options.subsampleX, options.subsampleY);
} else if ((c == 'd') && (strncmp(arg1, "data", length) == 0)) {
Tcl_DString buffer;
char *data;
/*
* photo data command - first parse and check any options given.
*/
Tk_ImageStringWriteProc *stringWriteProc = NULL;
index = 2;
memset((VOID *) &options, 0, sizeof(options));
options.name = NULL;
options.format = NULL;
options.fromX = 0;
options.fromY = 0;
if (ParseSubcommandOptions(&options, interp,
OPT_FORMAT | OPT_FROM | OPT_GRAYSCALE | OPT_BACKGROUND,
&index, argc, objv) != TCL_OK) {
return TCL_ERROR;
}
if ((options.name != NULL) || (index < argc)) {
Tcl_WrongNumArgs(interp, 2, objv, "?options?");
return TCL_ERROR;
}
if ((options.fromX > masterPtr->width)
|| (options.fromY > masterPtr->height)
|| (options.fromX2 > masterPtr->width)
|| (options.fromY2 > masterPtr->height)) {
Tcl_AppendResult(interp, "coordinates for -from option extend ",
"outside image", (char *) NULL);
return TCL_ERROR;
}
/*
* Fill in default values for unspecified parameters.
*/
if (((options.options & OPT_FROM) == 0) || (options.fromX2 < 0)) {
options.fromX2 = masterPtr->width;
options.fromY2 = masterPtr->height;
}
/*
* Search for an appropriate image string format handler.
*/
if (options.options & OPT_FORMAT) {
for (imageFormat = formatList; imageFormat != NULL;
imageFormat = imageFormat->nextPtr) {
if ((strncasecmp(Tcl_GetStringFromObj(options.format, NULL),
imageFormat->name, strlen(imageFormat->name)) == 0)) {
if (imageFormat->stringWriteProc != NULL) {
stringWriteProc = imageFormat->stringWriteProc;
break;
}
}
}
if (stringWriteProc == NULL) {
Tcl_AppendResult(interp, "image string format \"",
Tcl_GetStringFromObj(options.format, NULL),
"\" is not supported", (char *) NULL);
return TCL_ERROR;
}
} else {
stringWriteProc = ImgStringWrite;
}
/*
* Call the handler's string write procedure to write out
* the image.
*/
data = ImgGetPhoto(masterPtr, &block, &options);
Tcl_DStringInit(&buffer);
result = stringWriteProc(interp, &buffer,
options.format, &block);
if (options.background) {
Tk_FreeColor(options.background);
}
if (data) {
ckfree(data);
}
if (result == TCL_OK) {
Tcl_DStringResult(interp, &buffer);
} else {
Tcl_DStringFree(&buffer);
}
return result;
} else if ((c == 'f') && (strncmp(arg1, "formats", length) == 0)) {
Tk_PhotoImageFormat *formatPtr;
/*
* Scan through the table of file format handlers
*/
Tcl_ResetResult(interp);
for (formatPtr = formatList; formatPtr != NULL;
formatPtr = formatPtr->nextPtr) {
Tcl_AppendElement(interp, formatPtr->name);
}
} else if ((c == 'g') && (strncmp(arg1, "get", length) == 0)) {
/*
* photo get command - first parse and check parameters.
*/
if (argc != 4) {
Tcl_WrongNumArgs(interp, 2, objv, "x y");
return TCL_ERROR;
}
if ((Tcl_GetInt(interp, objv[2], &x) != TCL_OK)
|| (Tcl_GetInt(interp, objv[3], &y) != TCL_OK)) {
return TCL_ERROR;
}
if ((x < 0) || (x >= masterPtr->width)
|| (y < 0) || (y >= masterPtr->height)) {
Tcl_AppendResult(interp, strv[0], " get: ",
"coordinates out of range", (char *) NULL);
return TCL_ERROR;
}
/*
* Extract the value of the desired pixel and format it as a string.
*/
pixelPtr = masterPtr->pix24 + (y * masterPtr->width + x) * 4;
obj = Tcl_NewListObj(0,NULL);
for (c=0; c < 3; c++) {
Tcl_ListObjAppendElement(interp, obj, Tcl_NewIntObj(pixelPtr[c]));
}
Tcl_SetObjResult(interp, obj);
} else if ((c == 'p') && (strncmp(strv[1], "put", length) == 0)) {
/*
* photo put command - first parse the options and colors specified.
*/
index = 2;
memset((VOID *) &options, 0, sizeof(options));
options.name = NULL;
if (ParseSubcommandOptions(&options, interp, OPT_TO|OPT_FORMAT,
&index, argc, objv) != TCL_OK) {
return TCL_ERROR;
}
if ((options.name == NULL) || (index < argc)) {
Tcl_WrongNumArgs(interp, 2, objv, "data ?options?");
return TCL_ERROR;
}
if (MatchStringFormat(interp, options.name ? objv[2]:NULL,
options.format, &imageFormat, &imageWidth,
&imageHeight) == TCL_OK) {
if (((options.options & OPT_TO) == 0) || (options.toX2 < 0)) {
options.toX2 = options.toX + imageWidth;
options.toY2 = options.toY + imageHeight;
}
if (imageWidth > options.toX2 - options.toX) {
imageWidth = options.toX2 - options.toX;
}
if (imageHeight > options.toY2 - options.toY) {
imageHeight = options.toY2 - options.toY;
}
if ((*imageFormat->stringReadProc)(interp, objv[2],
options.format, (Tk_PhotoHandle) masterPtr,
0, 0, imageWidth, imageHeight, options.toX, options.toY)
!= TCL_OK) {
return TCL_ERROR;
}
masterPtr->flags |= IMAGE_CHANGED;
return TCL_OK;
}
if (options.options & OPT_FORMAT) {
return TCL_ERROR;
}
Tcl_ResetResult(interp);
if (Tcl_ListObjGetElements(interp, options.name, &dataHeight, &srcArgv) != TCL_OK) {
return TCL_ERROR;
}
tkwin = Tk_MainWindow(interp);
block.pixelPtr = NULL;
dataWidth = 0;
pixelPtr = NULL;
for (y = 0; y < dataHeight; ++y) {
if (Tcl_ListObjGetElements(interp, srcArgv[y], &listArgc, &listArgv) != TCL_OK) {
break;
}
if (y == 0) {
dataWidth = listArgc;
pixelPtr = (unsigned char *) ckalloc((unsigned)
dataWidth * dataHeight * 3);
block.pixelPtr = pixelPtr;
} else {
if (listArgc != dataWidth) {
Tcl_AppendResult(interp, "all elements of color list must",
" have the same number of elements",
(char *) NULL);
break;
}
}
for (x = 0; x < dataWidth; ++x) {
if (!XParseColor(Tk_Display(tkwin), Tk_Colormap(tkwin),
LangString(listArgv[x]), &color)) {
Tcl_AppendResult(interp, "can't parse color \"",
LangString(listArgv[x]), "\"", (char *) NULL);
break;
}
*pixelPtr++ = color.red >> 8;
*pixelPtr++ = color.green >> 8;
*pixelPtr++ = color.blue >> 8;
}
if (x < dataWidth)
break;
}
if (y < dataHeight || dataHeight == 0 || dataWidth == 0) {
if (block.pixelPtr != NULL) {
ckfree((char *) block.pixelPtr);
}
if (y < dataHeight) {
return TCL_ERROR;
}
return TCL_OK;
}
/*
* Fill in default values for the -to option, then
* copy the block in using Tk_PhotoPutBlock.
*/
if (((options.options & OPT_TO) == 0) || (options.toX2 < 0)) {
options.toX2 = options.toX + dataWidth;
options.toY2 = options.toY + dataHeight;
}
block.width = dataWidth;
block.height = dataHeight;
block.pitch = dataWidth * 3;
block.pixelSize = 3;
block.offset[0] = 0;
block.offset[1] = 1;
block.offset[2] = 2;
Tk_PhotoPutBlock((ClientData)masterPtr, &block,
options.toX, options.toY, options.toX2 - options.toX,
options.toY2 - options.toY);
ckfree((char *) block.pixelPtr);
} else if ((c == 'r') && (length >= 3)
&& (strncmp(arg1, "read", length) == 0)) {
/*
* photo read command - first parse the options specified.
*/
index = 2;
memset((VOID *) &options, 0, sizeof(options));
options.name = NULL;
options.format = NULL;
if (ParseSubcommandOptions(&options, interp,
OPT_FORMAT | OPT_FROM | OPT_TO | OPT_SHRINK,
&index, argc, objv) != TCL_OK) {
return TCL_ERROR;
}
if ((options.name == NULL) || (index < argc)) {
Tcl_WrongNumArgs(interp, 2, objv,
"fileName ?options?");
return TCL_ERROR;
}
/*
* Prevent file system access in safe interpreters.
*/
if (Tcl_IsSafe(interp)) {
Tcl_AppendResult(interp, "can't get image from a file in a",
" safe interpreter", (char *) NULL);
return TCL_ERROR;
}
/*
* Open the image file and look for a handler for it.
*/
chan = Tcl_OpenFileChannel(interp,
Tcl_GetStringFromObj(options.name, NULL), "r", 0);
if (chan == NULL) {
return TCL_ERROR;
}
if (Tcl_SetChannelOption(interp, chan, "-translation", "binary")
!= TCL_OK) {
return TCL_ERROR;
}
if (MatchFileFormat(interp, chan,
options.name, options.format,
&imageFormat, &imageWidth, &imageHeight) != TCL_OK) {
Tcl_Close(NULL, chan);
return TCL_ERROR;
}
/*
* Check the values given for the -from option.
*/
if ((options.fromX > imageWidth) || (options.fromY > imageHeight)
|| (options.fromX2 > imageWidth)
|| (options.fromY2 > imageHeight)) {
Tcl_AppendResult(interp, "coordinates for -from option extend ",
"outside source image", (char *) NULL);
Tcl_Close(NULL, chan);
return TCL_ERROR;
}
if (((options.options & OPT_FROM) == 0) || (options.fromX2 < 0)) {
width = imageWidth - options.fromX;
height = imageHeight - options.fromY;
} else {
width = options.fromX2 - options.fromX;
height = options.fromY2 - options.fromY;
}
/*
* If the -shrink option was specified, set the size of the image.
*/
if (options.options & OPT_SHRINK) {
ImgPhotoSetSize(masterPtr, options.toX + width,
options.toY + height);
}
/*
* Call the handler's file read procedure to read the data
* into the image.
*/
result = (*imageFormat->fileReadProc)(interp, chan,
options.name,
options.format, (Tk_PhotoHandle) masterPtr, options.toX,
options.toY, width, height, options.fromX, options.fromY);
if (chan != NULL) {
Tcl_Close(NULL, chan);
}
return result;
} else if ((c == 'r') && (length >= 3)
&& (strncmp(arg1, "redither", length) == 0)) {
if (argc == 2) {
/*
* Call Dither if any part of the image is not correctly
* dithered at present.
*/
x = masterPtr->ditherX;
y = masterPtr->ditherY;
if (masterPtr->ditherX != 0) {
Tk_DitherPhoto((Tk_PhotoHandle) masterPtr, x, y, masterPtr->width - x, 1);
}
if (masterPtr->ditherY < masterPtr->height) {
x = 0;
Tk_DitherPhoto((Tk_PhotoHandle) masterPtr, 0, masterPtr->ditherY, masterPtr->width,
masterPtr->height - masterPtr->ditherY);
}
if (y < masterPtr->height) {
/*
* Tell the core image code that part of the image has changed.
*/
Tk_ImageChanged(masterPtr->tkMaster, x, y,
(masterPtr->width - x), (masterPtr->height - y),
masterPtr->width, masterPtr->height);
}
} else {
Tcl_WrongNumArgs(interp, 2, objv, (char *) NULL);
return TCL_ERROR;
}
} else if ((c == 'w') && (strncmp(arg1, "write", length) == 0)) {
char *data;
/*
* Prevent file system access in safe interpreters.
*/
if (Tcl_IsSafe(interp)) {
Tcl_AppendResult(interp, "can't write image to a file in a",
" safe interpreter", (char *) NULL);
return TCL_ERROR;
}
/*
* photo write command - first parse and check any options given.
*/
index = 2;
memset((VOID *) &options, 0, sizeof(options));
options.name = NULL;
options.format = NULL;
if (ParseSubcommandOptions(&options, interp,
OPT_FORMAT | OPT_FROM | OPT_GRAYSCALE | OPT_BACKGROUND,
&index, argc, objv) != TCL_OK) {
return TCL_ERROR;
}
if ((options.name == NULL) || (index < argc)) {
Tcl_WrongNumArgs(interp, 2, objv, "fileName ?options?");
return TCL_ERROR;
}
if ((options.fromX > masterPtr->width)
|| (options.fromY > masterPtr->height)
|| (options.fromX2 > masterPtr->width)
|| (options.fromY2 > masterPtr->height)) {
Tcl_AppendResult(interp, "coordinates for -from option extend ",
"outside image", (char *) NULL);
return TCL_ERROR;
}
/*
* Fill in default values for unspecified parameters.
*/
if (((options.options & OPT_FROM) == 0) || (options.fromX2 < 0)) {
options.fromX2 = masterPtr->width;
options.fromY2 = masterPtr->height;
}
/*
* Search for an appropriate image file format handler,
* and give an error if none is found.
*/
matched = 0;
for (imageFormat = formatList; imageFormat != NULL;
imageFormat = imageFormat->nextPtr) {
if ((options.format == NULL)
|| (strncasecmp(Tcl_GetStringFromObj(options.format, NULL),
imageFormat->name, strlen(imageFormat->name)) == 0)) {
matched = 1;
if (imageFormat->fileWriteProc != NULL) {
break;
}
}
}
if (imageFormat == NULL) {
if (options.format == NULL) {
Tcl_AppendResult(interp, "no available image file format ",
"has file writing capability", (char *) NULL);
} else if (!matched) {
Tcl_AppendResult(interp, "image file format \"",
Tcl_GetStringFromObj(options.format, NULL),
"\" is unknown", (char *) NULL);
} else {
Tcl_AppendResult(interp, "image file format \"",
Tcl_GetStringFromObj(options.format, NULL),
"\" has no file writing capability",
(char *) NULL);
}
return TCL_ERROR;
}
/*
* Call the handler's file write procedure to write out
* the image.
*/
data = ImgGetPhoto(masterPtr, &block, &options);
result = (*imageFormat->fileWriteProc)(interp,
Tcl_GetStringFromObj(options.name, NULL),
options.format, &block);
if (options.background) {
Tk_FreeColor(options.background);
}
if (data) {
ckfree(data);
}
return result;
} else {
Tcl_CmdProc *proc;
proc = PhotoOptionFind(interp, LangString(objv[1]));
if (proc == (Tcl_CmdProc *) NULL) {
return TCL_ERROR;
}
return proc(clientData, interp, argc, objv);
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* ParseSubcommandOptions --
*
* This procedure is invoked to process one of the options
* which may be specified for the photo image subcommands,
* namely, -from, -to, -zoom, -subsample, -format, and -shrink.
*
* Results:
* A standard Tcl result.
*
* Side effects:
* Fields in *optPtr get filled in.
*
*----------------------------------------------------------------------
*/
static int
ParseSubcommandOptions(optPtr, interp, allowedOptions, optIndexPtr, argc, objv)
struct SubcommandOptions *optPtr;
/* Information about the options specified
* and the values given is returned here. */
Tcl_Interp *interp; /* Interpreter to use for reporting errors. */
int allowedOptions; /* Indicates which options are valid for
* the current command. */
int *optIndexPtr; /* Points to a variable containing the
* current index in argv; this variable is
* updated by this procedure. */
int argc; /* Number of arguments in argv[]. */
Tcl_Obj *objv[]; /* Arguments to be parsed. */
{
int index, c, bit, currentBit;
int length;
char *option, **listPtr;
int values[4];
int numValues, maxValues, argIndex;
for (index = *optIndexPtr; index < argc; *optIndexPtr = ++index) {
/*
* We can have one value specified without an option;
* it goes into optPtr->name.
*/
option = Tcl_GetStringFromObj(objv[index], &length);
if (option[0] != '-') {
if (optPtr->name == NULL) {
optPtr->name = objv[index];
continue;
}
break;
}
/*
* Work out which option this is.
*/
c = option[0];
bit = 0;
currentBit = 1;
for (listPtr = optionNames; *listPtr != NULL; ++listPtr) {
if ((c == *listPtr[0])
&& (strncmp(option, *listPtr, length) == 0)) {
if (bit != 0) {
bit = 0; /* An ambiguous option. */
break;
}
bit = currentBit;
}
currentBit <<= 1;
}
/*
* If this option is not recognized and allowed, put
* an error message in the interpreter and return.
*/
if ((allowedOptions & bit) == 0) {
Tcl_AppendResult(interp, "unrecognized option \"",
Tcl_GetStringFromObj(objv[index], NULL),
"\": must be ", (char *)NULL);
bit = 1;
for (listPtr = optionNames; *listPtr != NULL; ++listPtr) {
if ((allowedOptions & bit) != 0) {
if ((allowedOptions & (bit - 1)) != 0) {
Tcl_AppendResult(interp, ", ", (char *) NULL);
if ((allowedOptions & ~((bit << 1) - 1)) == 0) {
Tcl_AppendResult(interp, "or ", (char *) NULL);
}
}
Tcl_AppendResult(interp, *listPtr, (char *) NULL);
}
bit <<= 1;
}
return TCL_ERROR;
}
/*
* For the -from, -to, -zoom and -subsample options,
* parse the values given. Report an error if too few
* or too many values are given.
*/
if (bit == OPT_BACKGROUND) {
/*
* The -background option takes a single XColor value.
*/
if (index + 1 < argc) {
*optIndexPtr = ++index;
optPtr->background = Tk_GetColor(interp, Tk_MainWindow(interp),
Tk_GetUid(Tcl_GetStringFromObj(objv[index], NULL)));
if (!optPtr->background) {
return TCL_ERROR;
}
} else {
Tcl_AppendResult(interp, "the \"-background\" option ",
"requires a value", (char *) NULL);
return TCL_ERROR;
}
} else if (bit == OPT_FORMAT) {
/*
* The -format option takes a single string value.
*/
if (index + 1 < argc) {
*optIndexPtr = ++index;
optPtr->format = objv[index];
} else {
Tcl_AppendResult(interp, "the \"-format\" option ",
"requires a value", (char *) NULL);
return TCL_ERROR;
}
} else if ((bit != OPT_SHRINK) && (bit != OPT_GRAYSCALE)) {
maxValues = ((bit == OPT_FROM) || (bit == OPT_TO))? 4: 2;
argIndex = index + 1;
for (numValues = 0; numValues < maxValues; ++numValues) {
char *val = Tcl_GetStringFromObj(objv[argIndex], NULL);
if ((argIndex < argc) && (isdigit(UCHAR(val[0]))
|| ((val[0] == '-') && isdigit(UCHAR(val[1]))))) {
if (Tcl_GetInt(interp, objv[argIndex], &values[numValues])
!= TCL_OK) {
return TCL_ERROR;
}
} else {
break;
}
++argIndex;
}
if (numValues == 0) {
Tcl_AppendResult(interp, "the \"", option, "\" option ",
"requires one ", maxValues == 2? "or two": "to four",
" integer values", (char *) NULL);
return TCL_ERROR;
}
*optIndexPtr = (index += numValues);
/*
* Y values default to the corresponding X value if not specified.
*/
if (numValues == 1) {
values[1] = values[0];
}
if (numValues == 3) {
values[3] = values[2];
}
/*
* Check the values given and put them in the appropriate
* field of the SubcommandOptions structure.
*/
switch (bit) {
case OPT_FROM:
if ((values[0] < 0) || (values[1] < 0) || ((numValues > 2)
&& ((values[2] < 0) || (values[3] < 0)))) {
Tcl_AppendResult(interp, "value(s) for the -from",
" option must be non-negative", (char *) NULL);
return TCL_ERROR;
}
if (numValues <= 2) {
optPtr->fromX = values[0];
optPtr->fromY = values[1];
optPtr->fromX2 = -1;
optPtr->fromY2 = -1;
} else {
optPtr->fromX = MIN(values[0], values[2]);
optPtr->fromY = MIN(values[1], values[3]);
optPtr->fromX2 = MAX(values[0], values[2]);
optPtr->fromY2 = MAX(values[1], values[3]);
}
break;
case OPT_SUBSAMPLE:
optPtr->subsampleX = values[0];
optPtr->subsampleY = values[1];
break;
case OPT_TO:
if ((values[0] < 0) || (values[1] < 0) || ((numValues > 2)
&& ((values[2] < 0) || (values[3] < 0)))) {
Tcl_AppendResult(interp, "value(s) for the -to",
" option must be non-negative", (char *) NULL);
return TCL_ERROR;
}
if (numValues <= 2) {
optPtr->toX = values[0];
optPtr->toY = values[1];
optPtr->toX2 = -1;
optPtr->toY2 = -1;
} else {
optPtr->toX = MIN(values[0], values[2]);
optPtr->toY = MIN(values[1], values[3]);
optPtr->toX2 = MAX(values[0], values[2]);
optPtr->toY2 = MAX(values[1], values[3]);
}
break;
case OPT_ZOOM:
if ((values[0] <= 0) || (values[1] <= 0)) {
Tcl_AppendResult(interp, "value(s) for the -zoom",
" option must be positive", (char *) NULL);
return TCL_ERROR;
}
optPtr->zoomX = values[0];
optPtr->zoomY = values[1];
break;
}
}
/*
* Remember that we saw this option.
*/
optPtr->options |= bit;
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* ImgPhotoConfigureMaster --
*
* This procedure is called when a photo image is created or
* reconfigured. It processes configuration options and resets
* any instances of the image.
*
* Results:
* A standard Tcl return value. If TCL_ERROR is returned then
* an error message is left in masterPtr->interp->result.
*
* Side effects:
* Existing instances of the image will be redisplayed to match
* the new configuration options.
*
*----------------------------------------------------------------------
*/
static int
ImgPhotoConfigureMaster(interp, masterPtr, argc, objv, flags)
Tcl_Interp *interp; /* Interpreter to use for reporting errors. */
PhotoMaster *masterPtr; /* Pointer to data structure describing
* overall photo image to (re)configure. */
int argc; /* Number of entries in objv. */
Tcl_Obj *CONST objv[]; /* Pairs of configuration options for image. */
int flags; /* Flags to pass to Tk_ConfigureWidget,
* such as TK_CONFIG_ARGV_ONLY. */
{
PhotoInstance *instancePtr;
Tcl_Obj *oldFileString;
char *oldPaletteString;
Tcl_Obj *oldData, *data = NULL, *oldFormat, *format = NULL;
int length, i, j;
double oldGamma;
int result;
Tcl_Channel chan;
Tk_PhotoImageFormat *imageFormat;
int imageWidth, imageHeight;
char **strv = (char **) ckalloc((argc + 1) * sizeof(char *));
for (i = 0, j = 0; i < argc; i++,j++) {
strv[j] = Tcl_GetStringFromObj(objv[i], &length);
if ((length > 1) && (strv[j][0] == '-')) {
if ((strv[j][1] == 'd') &&
!strncmp(strv[j],"-data", length)) {
if (i < argc) {
data = objv[++i];
j--;
}
} else if ((strv[j][1] == 'f') &&
!strncmp(strv[j],"-format", length)) {
if (i < argc) {
format = objv[++i];
j--;
}
}
}
}
ckfree((char *) strv);
/*
* Save the current values for fileString and dataString, so we
* can tell if the user specifies them anew.
* IMPORTANT: if the format changes we have to interpret
* "-file" and "-data" again as well!!!!!!! It might be
* that the format string influences how "-data" or "-file"
* is interpreted.
*/
oldFileString = masterPtr->fileString;
oldData = (oldFileString == NULL) ? masterPtr->dataString: NULL;
oldFormat = masterPtr->format;
oldPaletteString = masterPtr->palette;
oldGamma = masterPtr->gamma;
/*
* Process the configuration options specified.
*/
if (Tk_ConfigureWidget(interp, Tk_MainWindow(interp), configSpecs,
argc, (Tcl_Obj **) objv, (char *) masterPtr, flags) != TCL_OK) {
return TCL_ERROR;
}
/*
* Regard the empty string for -file, -data or -format as the null
* value.
*/
if (masterPtr->fileString != NULL) {
Tcl_GetStringFromObj(masterPtr->fileString, &length);
if (!length) {
Tcl_DecrRefCount(masterPtr->fileString);
masterPtr->fileString = NULL;
}
}
if (masterPtr->dataString != NULL) {
Tcl_GetStringFromObj(masterPtr->dataString, &length);
if (!length) {
Tcl_DecrRefCount(masterPtr->dataString);
masterPtr->dataString = NULL;
}
}
if (masterPtr->format != NULL) {
Tcl_GetStringFromObj(masterPtr->format, &length);
if (!length) {
Tcl_DecrRefCount(masterPtr->format);
masterPtr->format = NULL;
}
}
/*
* Set the image to the user-requested size, if any,
* and make sure storage is correctly allocated for this image.
*/
ImgPhotoSetSize(masterPtr, masterPtr->width, masterPtr->height);
/*
* Read in the image from the file or string if the user has
* specified the -file or -data option.
*/
if ((masterPtr->fileString != NULL)
&& ((masterPtr->fileString != oldFileString)
|| (masterPtr->format != oldFormat))) {
/*
* Prevent file system access in a safe interpreter.
*/
if (Tcl_IsSafe(interp)) {
Tcl_AppendResult(interp, "can't get image from a file in a",
" safe interpreter", (char *) NULL);
return TCL_ERROR;
}
chan = Tcl_OpenFileChannel(interp, LangString(masterPtr->fileString), "r", 0);
if (chan == NULL) {
return TCL_ERROR;
}
if (Tcl_SetChannelOption(interp, chan, "-translation", "binary")
!= TCL_OK) {
return TCL_ERROR;
}
if (MatchFileFormat(interp, chan, masterPtr->fileString,
masterPtr->format, &imageFormat, &imageWidth,
&imageHeight) != TCL_OK) {
Tcl_Close(NULL, chan);
return TCL_ERROR;
}
ImgPhotoSetSize(masterPtr, imageWidth, imageHeight);
result = (*imageFormat->fileReadProc)(interp, chan,
masterPtr->fileString, masterPtr->format,
(Tk_PhotoHandle) masterPtr, 0, 0,
imageWidth, imageHeight, 0, 0);
Tcl_Close(NULL, chan);
if (result != TCL_OK) {
return TCL_ERROR;
}
Tcl_ResetResult(interp);
masterPtr->flags |= IMAGE_CHANGED;
}
if ((masterPtr->fileString == NULL) && (masterPtr->dataString != NULL)
&& ((masterPtr->dataString != oldData)
|| (masterPtr->format != oldFormat))) {
if (MatchStringFormat(interp, masterPtr->dataString,
masterPtr->format, &imageFormat, &imageWidth,
&imageHeight) != TCL_OK) {
return TCL_ERROR;
}
ImgPhotoSetSize(masterPtr, imageWidth, imageHeight);
if ((*imageFormat->stringReadProc)(interp, masterPtr->dataString,
masterPtr->format, (Tk_PhotoHandle) masterPtr,
0, 0, imageWidth, imageHeight, 0, 0) != TCL_OK) {
return TCL_ERROR;
}
Tcl_ResetResult(interp);
masterPtr->flags |= IMAGE_CHANGED;
}
/*
* Enforce a reasonable value for gamma.
*/
if (masterPtr->gamma <= 0) {
masterPtr->gamma = 1.0;
}
if ((masterPtr->gamma != oldGamma)
|| (masterPtr->palette != oldPaletteString)) {
masterPtr->flags |= IMAGE_CHANGED;
}
/*
* Cycle through all of the instances of this image, regenerating
* the information for each instance. Then force the image to be
* redisplayed everywhere that it is used.
*/
for (instancePtr = masterPtr->instancePtr; instancePtr != NULL;
instancePtr = instancePtr->nextPtr) {
ImgPhotoConfigureInstance(instancePtr);
}
/*
* Inform the generic image code that the image
* has (potentially) changed.
*/
Tk_ImageChanged(masterPtr->tkMaster, 0, 0, masterPtr->width,
masterPtr->height, masterPtr->width, masterPtr->height);
masterPtr->flags &= ~IMAGE_CHANGED;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* ImgPhotoConfigureInstance --
*
* This procedure is called to create displaying information for
* a photo image instance based on the configuration information
* in the master. It is invoked both when new instances are
* created and when the master is reconfigured.
*
* Results:
* None.
*
* Side effects:
* Generates errors via Tcl_BackgroundError if there are problems
* in setting up the instance.
*
*----------------------------------------------------------------------
*/
static void
ImgPhotoConfigureInstance(instancePtr)
PhotoInstance *instancePtr; /* Instance to reconfigure. */
{
PhotoMaster *masterPtr = instancePtr->masterPtr;
XImage *imagePtr;
int bitsPerPixel;
ColorTable *colorTablePtr;
XRectangle validBox;
/*
* If the -palette configuration option has been set for the master,
* use the value specified for our palette, but only if it is
* a valid palette for our windows. Use the gamma value specified
* the master.
*/
if ((masterPtr->palette && masterPtr->palette[0])
&& IsValidPalette(instancePtr, masterPtr->palette)) {
instancePtr->palette = masterPtr->palette;
} else {
instancePtr->palette = instancePtr->defaultPalette;
}
instancePtr->gamma = masterPtr->gamma;
/*
* If we don't currently have a color table, or if the one we
* have no longer applies (e.g. because our palette or gamma
* has changed), get a new one.
*/
colorTablePtr = instancePtr->colorTablePtr;
if ((colorTablePtr == NULL)
|| (instancePtr->colormap != colorTablePtr->id.colormap)
|| (instancePtr->palette != colorTablePtr->id.palette)
|| (instancePtr->gamma != colorTablePtr->id.gamma)) {
/*
* Free up our old color table, and get a new one.
*/
if (colorTablePtr != NULL) {
colorTablePtr->liveRefCount -= 1;
FreeColorTable(colorTablePtr, 0);
}
GetColorTable(instancePtr);
/*
* Create a new XImage structure for sending data to
* the X server, if necessary.
*/
if (instancePtr->colorTablePtr->flags & BLACK_AND_WHITE) {
bitsPerPixel = 1;
} else {
bitsPerPixel = instancePtr->visualInfo.depth;
}
if ((instancePtr->imagePtr == NULL)
|| (instancePtr->imagePtr->bits_per_pixel != bitsPerPixel)) {
if (instancePtr->imagePtr != NULL) {
XFree((char *) instancePtr->imagePtr);
}
imagePtr = XCreateImage(instancePtr->display,
instancePtr->visualInfo.visual, (unsigned) bitsPerPixel,
(bitsPerPixel > 1? ZPixmap: XYBitmap), 0, (char *) NULL,
1, 1, 32, 0);
instancePtr->imagePtr = imagePtr;
/*
* Determine the endianness of this machine.
* We create images using the local host's endianness, rather
* than the endianness of the server; otherwise we would have
* to byte-swap any 16 or 32 bit values that we store in the
* image in those situations where the server's endianness
* is different from ours.
*/
if (imagePtr != NULL) {
union {
int i;
char c[sizeof(int)];
} kludge;
imagePtr->bitmap_unit = sizeof(pixel) * NBBY;
kludge.i = 0;
kludge.c[0] = 1;
imagePtr->byte_order = (kludge.i == 1) ? LSBFirst : MSBFirst;
_XInitImageFuncPtrs(imagePtr);
}
}
}
/*
* If the user has specified a width and/or height for the master
* which is different from our current width/height, set the size
* to the values specified by the user. If we have no pixmap, we
* do this also, since it has the side effect of allocating a
* pixmap for us.
*/
if ((instancePtr->pixels == None) || (instancePtr->error == NULL)
|| (instancePtr->width != masterPtr->width)
|| (instancePtr->height != masterPtr->height)) {
ImgPhotoInstanceSetSize(instancePtr);
}
/*
* Redither this instance if necessary.
*/
if ((masterPtr->flags & IMAGE_CHANGED)
|| (instancePtr->colorTablePtr != colorTablePtr)) {
TkClipBox(masterPtr->validRegion, &validBox);
if ((validBox.width > 0) && (validBox.height > 0)) {
DitherInstance(instancePtr, validBox.x, validBox.y,
validBox.width, validBox.height);
}
}
}
/*
*----------------------------------------------------------------------
*
* ImgPhotoGet --
*
* This procedure is called for each use of a photo image in a
* widget.
*
* Results:
* The return value is a token for the instance, which is passed
* back to us in calls to ImgPhotoDisplay and ImgPhotoFree.
*
* Side effects:
* A data structure is set up for the instance (or, an existing
* instance is re-used for the new one).
*
*----------------------------------------------------------------------
*/
static ClientData
ImgPhotoGet(tkwin, masterData)
Tk_Window tkwin; /* Window in which the instance will be
* used. */
ClientData masterData; /* Pointer to our master structure for the
* image. */
{
PhotoMaster *masterPtr = (PhotoMaster *) masterData;
PhotoInstance *instancePtr;
Colormap colormap;
int mono, nRed, nGreen, nBlue;
XVisualInfo visualInfo, *visInfoPtr;
XRectangle validBox;
char buf[16];
int numVisuals;
XColor *white, *black;
XGCValues gcValues;
/*
* Table of "best" choices for palette for PseudoColor displays
* with between 3 and 15 bits/pixel.
*/
static int paletteChoice[13][3] = {
/* #red, #green, #blue */
{2, 2, 2, /* 3 bits, 8 colors */},
{2, 3, 2, /* 4 bits, 12 colors */},
{3, 4, 2, /* 5 bits, 24 colors */},
{4, 5, 3, /* 6 bits, 60 colors */},
{5, 6, 4, /* 7 bits, 120 colors */},
{7, 7, 4, /* 8 bits, 198 colors */},
{8, 10, 6, /* 9 bits, 480 colors */},
{10, 12, 8, /* 10 bits, 960 colors */},
{14, 15, 9, /* 11 bits, 1890 colors */},
{16, 20, 12, /* 12 bits, 3840 colors */},
{20, 24, 16, /* 13 bits, 7680 colors */},
{26, 30, 20, /* 14 bits, 15600 colors */},
{32, 32, 30, /* 15 bits, 30720 colors */}
};
/*
* See if there is already an instance for windows using
* the same colormap. If so then just re-use it.
*/
colormap = Tk_Colormap(tkwin);
for (instancePtr = masterPtr->instancePtr; instancePtr != NULL;
instancePtr = instancePtr->nextPtr) {
if ((colormap == instancePtr->colormap)
&& (Tk_Display(tkwin) == instancePtr->display)) {
/*
* Re-use this instance.
*/
if (instancePtr->refCount == 0) {
/*
* We are resurrecting this instance.
*/
Tcl_CancelIdleCall(DisposeInstance, (ClientData) instancePtr);
if (instancePtr->colorTablePtr != NULL) {
FreeColorTable(instancePtr->colorTablePtr, 0);
}
GetColorTable(instancePtr);
}
instancePtr->refCount++;
return (ClientData) instancePtr;
}
}
/*
* The image isn't already in use in a window with the same colormap.
* Make a new instance of the image.
*/
instancePtr = (PhotoInstance *) ckalloc(sizeof(PhotoInstance));
instancePtr->masterPtr = masterPtr;
instancePtr->display = Tk_Display(tkwin);
instancePtr->colormap = Tk_Colormap(tkwin);
Tk_PreserveColormap(instancePtr->display, instancePtr->colormap);
instancePtr->refCount = 1;
instancePtr->colorTablePtr = NULL;
instancePtr->pixels = None;
instancePtr->error = NULL;
instancePtr->width = 0;
instancePtr->height = 0;
instancePtr->imagePtr = 0;
instancePtr->nextPtr = masterPtr->instancePtr;
masterPtr->instancePtr = instancePtr;
/*
* Obtain information about the visual and decide on the
* default palette.
*/
visualInfo.screen = Tk_ScreenNumber(tkwin);
visualInfo.visualid = XVisualIDFromVisual(Tk_Visual(tkwin));
visInfoPtr = XGetVisualInfo(Tk_Display(tkwin),
VisualScreenMask | VisualIDMask, &visualInfo, &numVisuals);
nRed = 2;
nGreen = nBlue = 0;
mono = 1;
if (visInfoPtr != NULL) {
instancePtr->visualInfo = *visInfoPtr;
switch (visInfoPtr->class) {
case DirectColor:
case TrueColor:
nRed = 1 << CountBits(visInfoPtr->red_mask);
nGreen = 1 << CountBits(visInfoPtr->green_mask);
nBlue = 1 << CountBits(visInfoPtr->blue_mask);
mono = 0;
break;
case PseudoColor:
case StaticColor:
if (visInfoPtr->depth > 15) {
nRed = 32;
nGreen = 32;
nBlue = 32;
mono = 0;
} else if (visInfoPtr->depth >= 3) {
int *ip = paletteChoice[visInfoPtr->depth - 3];
nRed = ip[0];
nGreen = ip[1];
nBlue = ip[2];
mono = 0;
}
break;
case GrayScale:
case StaticGray:
nRed = 1 << visInfoPtr->depth;
break;
}
XFree((char *) visInfoPtr);
} else {
panic("ImgPhotoGet couldn't find visual for window");
}
sprintf(buf, ((mono) ? "%d": "%d/%d/%d"), nRed, nGreen, nBlue);
instancePtr->defaultPalette = Tk_GetUid(buf);
/*
* Make a GC with background = black and foreground = white.
*/
white = Tk_GetColor(masterPtr->interp, tkwin, "white");
black = Tk_GetColor(masterPtr->interp, tkwin, "black");
gcValues.foreground = (white != NULL)? white->pixel:
WhitePixelOfScreen(Tk_Screen(tkwin));
gcValues.background = (black != NULL)? black->pixel:
BlackPixelOfScreen(Tk_Screen(tkwin));
gcValues.graphics_exposures = False;
instancePtr->gc = Tk_GetGC(tkwin,
GCForeground|GCBackground|GCGraphicsExposures, &gcValues);
/*
* Set configuration options and finish the initialization of the instance.
*/
ImgPhotoConfigureInstance(instancePtr);
/*
* If this is the first instance, must set the size of the image.
*/
if (instancePtr->nextPtr == NULL) {
Tk_ImageChanged(masterPtr->tkMaster, 0, 0, 0, 0,
masterPtr->width, masterPtr->height);
}
/*
* Dither the image to fill in this instance's pixmap.
*/
TkClipBox(masterPtr->validRegion, &validBox);
if ((validBox.width > 0) && (validBox.height > 0)) {
DitherInstance(instancePtr, validBox.x, validBox.y, validBox.width,
validBox.height);
}
return (ClientData) instancePtr;
}
/*
*----------------------------------------------------------------------
*
* ImgPhotoDisplay --
*
* This procedure is invoked to draw a photo image.
*
* Results:
* None.
*
* Side effects:
* A portion of the image gets rendered in a pixmap or window.
*
*----------------------------------------------------------------------
*/
static void
ImgPhotoDisplay(clientData, display, drawable, imageX, imageY, width,
height, drawableX, drawableY)
ClientData clientData; /* Pointer to PhotoInstance structure for
* for instance to be displayed. */
Display *display; /* Display on which to draw image. */
Drawable drawable; /* Pixmap or window in which to draw image. */
int imageX, imageY; /* Upper-left corner of region within image
* to draw. */
int width, height; /* Dimensions of region within image to draw. */
int drawableX, drawableY; /* Coordinates within drawable that
* correspond to imageX and imageY. */
{
PhotoInstance *instancePtr = (PhotoInstance *) clientData;
/*
* If there's no pixmap, it means that an error occurred
* while creating the image instance so it can't be displayed.
*/
if (instancePtr->pixels == None) {
return;
}
/*
* masterPtr->region describes which parts of the image contain
* valid data. We set this region as the clip mask for the gc,
* setting its origin appropriately, and use it when drawing the
* image.
*/
TkSetRegion(display, instancePtr->gc, instancePtr->masterPtr->validRegion);
XSetClipOrigin(display, instancePtr->gc, drawableX - imageX,
drawableY - imageY);
XCopyArea(display, instancePtr->pixels, drawable, instancePtr->gc,
imageX, imageY, (unsigned) width, (unsigned) height,
drawableX, drawableY);
XSetClipMask(display, instancePtr->gc, None);
XSetClipOrigin(display, instancePtr->gc, 0, 0);
}
/*
*----------------------------------------------------------------------
*
* ImgPhotoFree --
*
* This procedure is called when a widget ceases to use a
* particular instance of an image. We don't actually get
* rid of the instance until later because we may be about
* to get this instance again.
*
* Results:
* None.
*
* Side effects:
* Internal data structures get cleaned up, later.
*
*----------------------------------------------------------------------
*/
static void
ImgPhotoFree(clientData, display)
ClientData clientData; /* Pointer to PhotoInstance structure for
* for instance to be displayed. */
Display *display; /* Display containing window that used image. */
{
PhotoInstance *instancePtr = (PhotoInstance *) clientData;
ColorTable *colorPtr;
instancePtr->refCount -= 1;
if (instancePtr->refCount > 0) {
return;
}
/*
* There are no more uses of the image within this widget.
* Decrement the count of live uses of its color table, so
* that its colors can be reclaimed if necessary, and
* set up an idle call to free the instance structure.
*/
colorPtr = instancePtr->colorTablePtr;
if (colorPtr != NULL) {
colorPtr->liveRefCount -= 1;
}
Tcl_DoWhenIdle(DisposeInstance, (ClientData) instancePtr);
}
/*
*----------------------------------------------------------------------
*
* ImgPhotoDelete --
*
* This procedure is called by the image code to delete the
* master structure for an image.
*
* Results:
* None.
*
* Side effects:
* Resources associated with the image get freed.
*
*----------------------------------------------------------------------
*/
static void
ImgPhotoDelete(masterData)
ClientData masterData; /* Pointer to PhotoMaster structure for
* image. Must not have any more instances. */
{
PhotoMaster *masterPtr = (PhotoMaster *) masterData;
PhotoInstance *instancePtr;
while ((instancePtr = masterPtr->instancePtr) != NULL) {
if (instancePtr->refCount > 0) {
panic("tried to delete photo image when instances still exist");
}
Tcl_CancelIdleCall(DisposeInstance, (ClientData) instancePtr);
DisposeInstance((ClientData) instancePtr);
}
masterPtr->tkMaster = NULL;
if (masterPtr->imageCmd != NULL) {
Tcl_DeleteCommandFromToken(masterPtr->interp, masterPtr->imageCmd);
}
if (masterPtr->pix24 != NULL) {
ckfree((char *) masterPtr->pix24);
}
if (masterPtr->validRegion != NULL) {
TkDestroyRegion(masterPtr->validRegion);
}
#ifndef _LANG
if (masterPtr->dataString != NULL) {
Tcl_DecrRefCount(masterPtr->dataString);
}
if (masterPtr->format != NULL) {
Tcl_DecrRefCount(masterPtr->format);
}
#endif
Tk_FreeOptions(configSpecs, (char *) masterPtr, (Display *) NULL, 0);
ckfree((char *) masterPtr);
}
/*
*----------------------------------------------------------------------
*
* ImgPhotoCmdDeletedProc --
*
* This procedure is invoked when the image command for an image
* is deleted. It deletes the image.
*
* Results:
* None.
*
* Side effects:
* The image is deleted.
*
*----------------------------------------------------------------------
*/
static void
ImgPhotoCmdDeletedProc(clientData)
ClientData clientData; /* Pointer to PhotoMaster structure for
* image. */
{
PhotoMaster *masterPtr = (PhotoMaster *) clientData;
masterPtr->imageCmd = NULL;
if (masterPtr->tkMaster != NULL) {
Tk_DeleteImage(masterPtr->interp, Tk_NameOfImage(masterPtr->tkMaster));
}
}
/*
*----------------------------------------------------------------------
*
* ImgPhotoSetSize --
*
* This procedure reallocates the image storage and instance
* pixmaps for a photo image, as necessary, to change the
* image's size to `width' x `height' pixels.
*
* Results:
* None.
*
* Side effects:
* Storage gets reallocated, for the master and all its instances.
*
*----------------------------------------------------------------------
*/
static void
ImgPhotoSetSize(masterPtr, width, height)
PhotoMaster *masterPtr;
int width, height;
{
unsigned char *newPix24;
int h, offset, pitch;
unsigned char *srcPtr, *destPtr;
XRectangle validBox, clipBox;
TkRegion clipRegion;
PhotoInstance *instancePtr;
size_t memsize;
if (masterPtr->userWidth > 0) {
width = masterPtr->userWidth;
}
if (masterPtr->userHeight > 0) {
height = masterPtr->userHeight;
}
/*
* We have to trim the valid region if it is currently
* larger than the new image size.
*/
TkClipBox(masterPtr->validRegion, &validBox);
if ((validBox.x + validBox.width > width)
|| (validBox.y + validBox.height > height)) {
clipBox.x = 0;
clipBox.y = 0;
clipBox.width = width;
clipBox.height = height;
clipRegion = TkCreateRegion();
TkUnionRectWithRegion(&clipBox, clipRegion, clipRegion);
TkIntersectRegion(masterPtr->validRegion, clipRegion,
masterPtr->validRegion);
TkDestroyRegion(clipRegion);
TkClipBox(masterPtr->validRegion, &validBox);
}
if ((width != masterPtr->width) || (height != masterPtr->height)
|| (masterPtr->pix24 == NULL)) {
/*
* Reallocate storage for the 24-bit image and copy
* over valid regions.
*/
pitch = width * 4;
memsize = (height * pitch);
newPix24 = (memsize) ? ((unsigned char *) ckalloc(memsize)) : NULL;
/*
* Zero the new array. The dithering code shouldn't read the
* areas outside validBox, but they might be copied to another
* photo image or written to a file.
*/
if ((masterPtr->pix24 != NULL)
&& ((width == masterPtr->width) || (width == validBox.width))) {
if (validBox.y > 0) {
memset((VOID *) newPix24, 0, (size_t) (validBox.y * pitch));
}
h = validBox.y + validBox.height;
if (h < height) {
memset((VOID *) (newPix24 + h * pitch), 0,
(size_t) ((height - h) * pitch));
}
} else if (newPix24 != NULL) {
memset((VOID *) newPix24, 0, memsize);
}
if (masterPtr->pix24 != NULL) {
/*
* Copy the common area over to the new array array and
* free the old array.
*/
if (newPix24 == NULL) {
/*
* Nowhere to copy to ...
*/
} else if (width == masterPtr->width) {
/*
* The region to be copied is contiguous.
*/
offset = validBox.y * pitch;
memcpy((VOID *) (newPix24 + offset),
(VOID *) (masterPtr->pix24 + offset),
(size_t) (validBox.height * pitch));
} else if ((validBox.width > 0) && (validBox.height > 0)) {
/*
* Area to be copied is not contiguous - copy line by line.
*/
destPtr = newPix24 + (validBox.y * width + validBox.x) * 4;
srcPtr = masterPtr->pix24 + (validBox.y * masterPtr->width
+ validBox.x) * 4;
for (h = validBox.height; h > 0; h--) {
memcpy((VOID *) destPtr, (VOID *) srcPtr,
(size_t) (validBox.width * 4));
destPtr += width * 4;
srcPtr += masterPtr->width * 4;
}
}
ckfree((char *) masterPtr->pix24);
}
masterPtr->pix24 = newPix24;
masterPtr->width = width;
masterPtr->height = height;
/*
* Dithering will be correct up to the end of the last
* pre-existing complete scanline.
*/
if ((validBox.x > 0) || (validBox.y > 0)) {
masterPtr->ditherX = 0;
masterPtr->ditherY = 0;
} else if (validBox.width == width) {
if ((int) validBox.height < masterPtr->ditherY) {
masterPtr->ditherX = 0;
masterPtr->ditherY = validBox.height;
}
} else {
if ((masterPtr->ditherY > 0)
|| ((int) validBox.width < masterPtr->ditherX)) {
masterPtr->ditherX = validBox.width;
masterPtr->ditherY = 0;
}
}
}
/*
* Now adjust the sizes of the pixmaps for all of the instances.
*/
for (instancePtr = masterPtr->instancePtr; instancePtr != NULL;
instancePtr = instancePtr->nextPtr) {
ImgPhotoInstanceSetSize(instancePtr);
}
}
/*
*----------------------------------------------------------------------
*
* ImgPhotoInstanceSetSize --
*
* This procedure reallocates the instance pixmap and dithering
* error array for a photo instance, as necessary, to change the
* image's size to `width' x `height' pixels.
*
* Results:
* None.
*
* Side effects:
* Storage gets reallocated, here and in the X server.
*
*----------------------------------------------------------------------
*/
static void
ImgPhotoInstanceSetSize(instancePtr)
PhotoInstance *instancePtr; /* Instance whose size is to be
* changed. */
{
PhotoMaster *masterPtr;
schar *newError;
schar *errSrcPtr, *errDestPtr;
int h, offset;
XRectangle validBox;
Pixmap newPixmap;
masterPtr = instancePtr->masterPtr;
TkClipBox(masterPtr->validRegion, &validBox);
if ((instancePtr->width != masterPtr->width)
|| (instancePtr->height != masterPtr->height)
|| (instancePtr->pixels == None)) {
newPixmap = Tk_GetPixmap(instancePtr->display,
RootWindow(instancePtr->display,
instancePtr->visualInfo.screen),
(masterPtr->width > 0) ? masterPtr->width: 1,
(masterPtr->height > 0) ? masterPtr->height: 1,
instancePtr->visualInfo.depth);
/*
* The following is a gross hack needed to properly support colormaps
* under Windows. Before the pixels can be copied to the pixmap,
* the relevent colormap must be associated with the drawable.
* Normally we can infer this association from the window that
* was used to create the pixmap. However, in this case we're
* using the root window, so we have to be more explicit.
*/
TkSetPixmapColormap(newPixmap, instancePtr->colormap);
if (instancePtr->pixels != None) {
/*
* Copy any common pixels from the old pixmap and free it.
*/
XCopyArea(instancePtr->display, instancePtr->pixels, newPixmap,
instancePtr->gc, validBox.x, validBox.y,
validBox.width, validBox.height, validBox.x, validBox.y);
Tk_FreePixmap(instancePtr->display, instancePtr->pixels);
}
instancePtr->pixels = newPixmap;
}
if ((instancePtr->width != masterPtr->width)
|| (instancePtr->height != masterPtr->height)
|| (instancePtr->error == NULL)) {
newError = (schar *) ckalloc((unsigned)
(masterPtr->height * masterPtr->width * 3 * sizeof(schar)));
/*
* Zero the new array so that we don't get bogus error values
* propagating into areas we dither later.
*/
if ((instancePtr->error != NULL)
&& ((instancePtr->width == masterPtr->width)
|| (validBox.width == masterPtr->width))) {
if (validBox.y > 0) {
memset((VOID *) newError, 0, (size_t)
(validBox.y * masterPtr->width * 3 * sizeof(schar)));
}
h = validBox.y + validBox.height;
if (h < masterPtr->height) {
memset((VOID *) (newError + h * masterPtr->width * 3), 0,
(size_t) ((masterPtr->height - h)
* masterPtr->width * 3 * sizeof(schar)));
}
} else {
memset((VOID *) newError, 0, (size_t)
(masterPtr->height * masterPtr->width * 3 * sizeof(schar)));
}
if (instancePtr->error != NULL) {
/*
* Copy the common area over to the new array
* and free the old array.
*/
if (masterPtr->width == instancePtr->width) {
offset = validBox.y * masterPtr->width * 3;
memcpy((VOID *) (newError + offset),
(VOID *) (instancePtr->error + offset),
(size_t) (validBox.height
* masterPtr->width * 3 * sizeof(schar)));
} else if (validBox.width > 0 && validBox.height > 0) {
errDestPtr = newError
+ (validBox.y * masterPtr->width + validBox.x) * 3;
errSrcPtr = instancePtr->error
+ (validBox.y * instancePtr->width + validBox.x) * 3;
for (h = validBox.height; h > 0; --h) {
memcpy((VOID *) errDestPtr, (VOID *) errSrcPtr,
validBox.width * 3 * sizeof(schar));
errDestPtr += masterPtr->width * 3;
errSrcPtr += instancePtr->width * 3;
}
}
ckfree((char *) instancePtr->error);
}
instancePtr->error = newError;
}
instancePtr->width = masterPtr->width;
instancePtr->height = masterPtr->height;
}
/*
*----------------------------------------------------------------------
*
* IsValidPalette --
*
* This procedure is called to check whether a value given for
* the -palette option is valid for a particular instance
* of a photo image.
*
* Results:
* A boolean value: 1 if the palette is acceptable, 0 otherwise.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
IsValidPalette(instancePtr, palette)
PhotoInstance *instancePtr; /* Instance to which the palette
* specification is to be applied. */
char *palette; /* Palette specification string. */
{
int nRed, nGreen, nBlue, mono, numColors;
char *endp;
/*
* First parse the specification: it must be of the form
* %d or %d/%d/%d.
*/
nRed = strtol(palette, &endp, 10);
if ((endp == palette) || ((*endp != 0) && (*endp != '/'))
|| (nRed < 2) || (nRed > 256)) {
return 0;
}
if (*endp == 0) {
mono = 1;
nGreen = nBlue = nRed;
} else {
palette = endp + 1;
nGreen = strtol(palette, &endp, 10);
if ((endp == palette) || (*endp != '/') || (nGreen < 2)
|| (nGreen > 256)) {
return 0;
}
palette = endp + 1;
nBlue = strtol(palette, &endp, 10);
if ((endp == palette) || (*endp != 0) || (nBlue < 2)
|| (nBlue > 256)) {
return 0;
}
mono = 0;
}
switch (instancePtr->visualInfo.class) {
case DirectColor:
case TrueColor:
if ((nRed > (1 << CountBits(instancePtr->visualInfo.red_mask)))
|| (nGreen > (1
<< CountBits(instancePtr->visualInfo.green_mask)))
|| (nBlue > (1
<< CountBits(instancePtr->visualInfo.blue_mask)))) {
return 0;
}
break;
case PseudoColor:
case StaticColor:
numColors = nRed;
if (!mono) {
numColors *= nGreen*nBlue;
}
if (numColors > (1 << instancePtr->visualInfo.depth)) {
return 0;
}
break;
case GrayScale:
case StaticGray:
if (!mono || (nRed > (1 << instancePtr->visualInfo.depth))) {
return 0;
}
break;
}
return 1;
}
/*
*----------------------------------------------------------------------
*
* CountBits --
*
* This procedure counts how many bits are set to 1 in `mask'.
*
* Results:
* The integer number of bits.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
CountBits(mask)
pixel mask; /* Value to count the 1 bits in. */
{
int n;
for( n = 0; mask != 0; mask &= mask - 1 )
n++;
return n;
}
/*
*----------------------------------------------------------------------
*
* GetColorTable --
*
* This procedure is called to allocate a table of colormap
* information for an instance of a photo image. Only one such
* table is allocated for all photo instances using the same
* display, colormap, palette and gamma values, so that the
* application need only request a set of colors from the X
* server once for all such photo widgets. This procedure
* maintains a hash table to find previously-allocated
* ColorTables.
*
* Results:
* None.
*
* Side effects:
* A new ColorTable may be allocated and placed in the hash
* table, and have colors allocated for it.
*
*----------------------------------------------------------------------
*/
static void
GetColorTable(instancePtr)
PhotoInstance *instancePtr; /* Instance needing a color table. */
{
ColorTable *colorPtr;
Tcl_HashEntry *entry;
ColorTableId id;
int isNew;
/*
* Look for an existing ColorTable in the hash table.
*/
memset((VOID *) &id, 0, sizeof(id));
id.display = instancePtr->display;
id.colormap = instancePtr->colormap;
id.palette = instancePtr->palette;
id.gamma = instancePtr->gamma;
if (!imgPhotoColorHashInitialized) {
Tcl_InitHashTable(&imgPhotoColorHash, N_COLOR_HASH);
imgPhotoColorHashInitialized = 1;
}
entry = Tcl_CreateHashEntry(&imgPhotoColorHash, (char *) &id, &isNew);
if (!isNew) {
/*
* Re-use the existing entry.
*/
colorPtr = (ColorTable *) Tcl_GetHashValue(entry);
} else {
/*
* No color table currently available; need to make one.
*/
colorPtr = (ColorTable *) ckalloc(sizeof(ColorTable));
/*
* The following line of code should not normally be needed due
* to the assignment in the following line. However, it compensates
* for bugs in some compilers (HP, for example) where
* sizeof(ColorTable) is 24 but the assignment only copies 20 bytes,
* leaving 4 bytes uninitialized; these cause problems when using
* the id for lookups in imgPhotoColorHash, and can result in
* core dumps.
*/
memset((VOID *) &colorPtr->id, 0, sizeof(ColorTableId));
colorPtr->id = id;
Tk_PreserveColormap(colorPtr->id.display, colorPtr->id.colormap);
colorPtr->flags = 0;
colorPtr->refCount = 0;
colorPtr->liveRefCount = 0;
colorPtr->numColors = 0;
colorPtr->visualInfo = instancePtr->visualInfo;
colorPtr->pixelMap = NULL;
Tcl_SetHashValue(entry, colorPtr);
}
colorPtr->refCount++;
colorPtr->liveRefCount++;
instancePtr->colorTablePtr = colorPtr;
if (colorPtr->flags & DISPOSE_PENDING) {
Tcl_CancelIdleCall(DisposeColorTable, (ClientData) colorPtr);
colorPtr->flags &= ~DISPOSE_PENDING;
}
/*
* Allocate colors for this color table if necessary.
*/
if ((colorPtr->numColors == 0)
&& ((colorPtr->flags & BLACK_AND_WHITE) == 0)) {
AllocateColors(colorPtr);
}
}
/*
*----------------------------------------------------------------------
*
* FreeColorTable --
*
* This procedure is called when an instance ceases using a
* color table.
*
* Results:
* None.
*
* Side effects:
* If no other instances are using this color table, a when-idle
* handler is registered to free up the color table and the colors
* allocated for it.
*
*----------------------------------------------------------------------
*/
static void
FreeColorTable(colorPtr, force)
ColorTable *colorPtr; /* Pointer to the color table which is
* no longer required by an instance. */
int force; /* Force free to happen immediately. */
{
colorPtr->refCount--;
if (colorPtr->refCount > 0) {
return;
}
if (force) {
if ((colorPtr->flags & DISPOSE_PENDING) != 0) {
Tcl_CancelIdleCall(DisposeColorTable, (ClientData) colorPtr);
colorPtr->flags &= ~DISPOSE_PENDING;
}
DisposeColorTable((ClientData) colorPtr);
} else if ((colorPtr->flags & DISPOSE_PENDING) == 0) {
Tcl_DoWhenIdle(DisposeColorTable, (ClientData) colorPtr);
colorPtr->flags |= DISPOSE_PENDING;
}
}
/*
*----------------------------------------------------------------------
*
* AllocateColors --
*
* This procedure allocates the colors required by a color table,
* and sets up the fields in the color table data structure which
* are used in dithering.
*
* Results:
* None.
*
* Side effects:
* Colors are allocated from the X server. Fields in the
* color table data structure are updated.
*
*----------------------------------------------------------------------
*/
static void
AllocateColors(colorPtr)
ColorTable *colorPtr; /* Pointer to the color table requiring
* colors to be allocated. */
{
int i, r, g, b, rMult, mono;
int numColors, nRed, nGreen, nBlue;
double fr, fg, fb, igam;
XColor *colors;
unsigned long *pixels;
/* 16-bit intensity value for i/n of full intensity. */
# define CFRAC(i, n) ((i) * 65535 / (n))
/* As for CFRAC, but apply exponent of g. */
# define CGFRAC(i, n, g) ((int)(65535 * pow((double)(i) / (n), (g))))
/*
* First parse the palette specification to get the required number of
* shades of each primary.
*/
mono = sscanf(colorPtr->id.palette, "%d/%d/%d", &nRed, &nGreen, &nBlue)
<= 1;
igam = 1.0 / colorPtr->id.gamma;
/*
* Each time around this loop, we reduce the number of colors we're
* trying to allocate until we succeed in allocating all of the colors
* we need.
*/
for (;;) {
/*
* If we are using 1 bit/pixel, we don't need to allocate
* any colors (we just use the foreground and background
* colors in the GC).
*/
if (mono && (nRed <= 2)) {
colorPtr->flags |= BLACK_AND_WHITE;
return;
}
/*
* Calculate the RGB coordinates of the colors we want to
* allocate and store them in *colors.
*/
if ((colorPtr->visualInfo.class == DirectColor)
|| (colorPtr->visualInfo.class == TrueColor)) {
/*
* Direct/True Color: allocate shades of red, green, blue
* independently.
*/
if (mono) {
numColors = nGreen = nBlue = nRed;
} else {
numColors = MAX(MAX(nRed, nGreen), nBlue);
}
colors = (XColor *) ckalloc(numColors * sizeof(XColor));
for (i = 0; i < numColors; ++i) {
if (igam == 1.0) {
colors[i].red = CFRAC(i, nRed - 1);
colors[i].green = CFRAC(i, nGreen - 1);
colors[i].blue = CFRAC(i, nBlue - 1);
} else {
colors[i].red = CGFRAC(i, nRed - 1, igam);
colors[i].green = CGFRAC(i, nGreen - 1, igam);
colors[i].blue = CGFRAC(i, nBlue - 1, igam);
}
}
} else {
/*
* PseudoColor, StaticColor, GrayScale or StaticGray visual:
* we have to allocate each color in the color cube separately.
*/
numColors = (mono) ? nRed: (nRed * nGreen * nBlue);
colors = (XColor *) ckalloc(numColors * sizeof(XColor));
if (!mono) {
/*
* Color display using a PseudoColor or StaticColor visual.
*/
i = 0;
for (r = 0; r < nRed; ++r) {
for (g = 0; g < nGreen; ++g) {
for (b = 0; b < nBlue; ++b) {
if (igam == 1.0) {
colors[i].red = CFRAC(r, nRed - 1);
colors[i].green = CFRAC(g, nGreen - 1);
colors[i].blue = CFRAC(b, nBlue - 1);
} else {
colors[i].red = CGFRAC(r, nRed - 1, igam);
colors[i].green = CGFRAC(g, nGreen - 1, igam);
colors[i].blue = CGFRAC(b, nBlue - 1, igam);
}
i++;
}
}
}
} else {
/*
* Monochrome display - allocate the shades of grey we want.
*/
for (i = 0; i < numColors; ++i) {
if (igam == 1.0) {
r = CFRAC(i, numColors - 1);
} else {
r = CGFRAC(i, numColors - 1, igam);
}
colors[i].red = colors[i].green = colors[i].blue = r;
}
}
}
/*
* Now try to allocate the colors we've calculated.
*/
pixels = (unsigned long *) ckalloc(numColors * sizeof(unsigned long));
for (i = 0; i < numColors; ++i) {
if (!XAllocColor(colorPtr->id.display, colorPtr->id.colormap,
&colors[i])) {
/*
* Can't get all the colors we want in the default colormap;
* first try freeing colors from other unused color tables.
*/
if (!ReclaimColors(&colorPtr->id, numColors - i)
|| !XAllocColor(colorPtr->id.display,
colorPtr->id.colormap, &colors[i])) {
/*
* Still can't allocate the color.
*/
break;
}
}
pixels[i] = colors[i].pixel;
}
/*
* If we didn't get all of the colors, reduce the
* resolution of the color cube, free the ones we got,
* and try again.
*/
if (i >= numColors) {
break;
}
XFreeColors(colorPtr->id.display, colorPtr->id.colormap, pixels, i, 0);
ckfree((char *) colors);
ckfree((char *) pixels);
if (!mono) {
if ((nRed == 2) && (nGreen == 2) && (nBlue == 2)) {
/*
* Fall back to 1-bit monochrome display.
*/
mono = 1;
} else {
/*
* Reduce the number of shades of each primary to about
* 3/4 of the previous value. This should reduce the
* total number of colors required to about half the
* previous value for PseudoColor displays.
*/
nRed = (nRed * 3 + 2) / 4;
nGreen = (nGreen * 3 + 2) / 4;
nBlue = (nBlue * 3 + 2) / 4;
}
} else {
/*
* Reduce the number of shades of gray to about 1/2.
*/
nRed = nRed / 2;
}
}
/*
* We have allocated all of the necessary colors:
* fill in various fields of the ColorTable record.
*/
if (!mono) {
colorPtr->flags |= TK_COLOR_WINDOW;
/*
* The following is a hairy hack. We only want to index into
* the pixelMap on colormap displays. However, if the display
* is on Windows, then we actually want to store the index not
* the value since we will be passing the color table into the
* TkPutImage call.
*/
#ifndef __WIN32__
if ((colorPtr->visualInfo.class != DirectColor)
&& (colorPtr->visualInfo.class != TrueColor)) {
colorPtr->flags |= MAP_COLORS;
}
#endif /* __WIN32__ */
}
colorPtr->numColors = numColors;
colorPtr->pixelMap = pixels;
/*
* Set up quantization tables for dithering.
*/
rMult = nGreen * nBlue;
for (i = 0; i < 256; ++i) {
r = (i * (nRed - 1) + 127) / 255;
if (mono) {
fr = (double) colors[r].red / 65535.0;
if (colorPtr->id.gamma != 1.0 ) {
fr = pow(fr, colorPtr->id.gamma);
}
colorPtr->colorQuant[0][i] = (int)(fr * 255.99);
colorPtr->redValues[i] = colors[r].pixel;
} else {
g = (i * (nGreen - 1) + 127) / 255;
b = (i * (nBlue - 1) + 127) / 255;
if ((colorPtr->visualInfo.class == DirectColor)
|| (colorPtr->visualInfo.class == TrueColor)) {
colorPtr->redValues[i] = colors[r].pixel
& colorPtr->visualInfo.red_mask;
colorPtr->greenValues[i] = colors[g].pixel
& colorPtr->visualInfo.green_mask;
colorPtr->blueValues[i] = colors[b].pixel
& colorPtr->visualInfo.blue_mask;
} else {
r *= rMult;
g *= nBlue;
colorPtr->redValues[i] = r;
colorPtr->greenValues[i] = g;
colorPtr->blueValues[i] = b;
}
fr = (double) colors[r].red / 65535.0;
fg = (double) colors[g].green / 65535.0;
fb = (double) colors[b].blue / 65535.0;
if (colorPtr->id.gamma != 1.0) {
fr = pow(fr, colorPtr->id.gamma);
fg = pow(fg, colorPtr->id.gamma);
fb = pow(fb, colorPtr->id.gamma);
}
colorPtr->colorQuant[0][i] = (int)(fr * 255.99);
colorPtr->colorQuant[1][i] = (int)(fg * 255.99);
colorPtr->colorQuant[2][i] = (int)(fb * 255.99);
}
}
ckfree((char *) colors);
}
/*
*----------------------------------------------------------------------
*
* DisposeColorTable --
*
*
* Results:
* None.
*
* Side effects:
* The colors in the argument color table are freed, as is the
* color table structure itself. The color table is removed
* from the hash table which is used to locate color tables.
*
*----------------------------------------------------------------------
*/
static void
DisposeColorTable(clientData)
ClientData clientData; /* Pointer to the ColorTable whose
* colors are to be released. */
{
ColorTable *colorPtr;
Tcl_HashEntry *entry;
colorPtr = (ColorTable *) clientData;
if (colorPtr->pixelMap != NULL) {
if (colorPtr->numColors > 0) {
XFreeColors(colorPtr->id.display, colorPtr->id.colormap,
colorPtr->pixelMap, colorPtr->numColors, 0);
Tk_FreeColormap(colorPtr->id.display, colorPtr->id.colormap);
}
ckfree((char *) colorPtr->pixelMap);
}
entry = Tcl_FindHashEntry(&imgPhotoColorHash, (char *) &colorPtr->id);
if (entry == NULL) {
panic("DisposeColorTable couldn't find hash entry");
}
Tcl_DeleteHashEntry(entry);
ckfree((char *) colorPtr);
}
/*
*----------------------------------------------------------------------
*
* ReclaimColors --
*
* This procedure is called to try to free up colors in the
* colormap used by a color table. It looks for other color
* tables with the same colormap and with a zero live reference
* count, and frees their colors. It only does so if there is
* the possibility of freeing up at least `numColors' colors.
*
* Results:
* The return value is TRUE if any colors were freed, FALSE
* otherwise.
*
* Side effects:
* ColorTables which are not currently in use may lose their
* color allocations.
*
*---------------------------------------------------------------------- */
static int
ReclaimColors(id, numColors)
ColorTableId *id; /* Pointer to information identifying
* the color table which needs more colors. */
int numColors; /* Number of colors required. */
{
Tcl_HashSearch srch;
Tcl_HashEntry *entry;
ColorTable *colorPtr;
int nAvail;
/*
* First scan through the color hash table to get an
* upper bound on how many colors we might be able to free.
*/
nAvail = 0;
entry = Tcl_FirstHashEntry(&imgPhotoColorHash, &srch);
while (entry != NULL) {
colorPtr = (ColorTable *) Tcl_GetHashValue(entry);
if ((colorPtr->id.display == id->display)
&& (colorPtr->id.colormap == id->colormap)
&& (colorPtr->liveRefCount == 0 )&& (colorPtr->numColors != 0)
&& ((colorPtr->id.palette != id->palette)
|| (colorPtr->id.gamma != id->gamma))) {
/*
* We could take this guy's colors off him.
*/
nAvail += colorPtr->numColors;
}
entry = Tcl_NextHashEntry(&srch);
}
/*
* nAvail is an (over)estimate of the number of colors we could free.
*/
if (nAvail < numColors) {
return 0;
}
/*
* Scan through a second time freeing colors.
*/
entry = Tcl_FirstHashEntry(&imgPhotoColorHash, &srch);
while ((entry != NULL) && (numColors > 0)) {
colorPtr = (ColorTable *) Tcl_GetHashValue(entry);
if ((colorPtr->id.display == id->display)
&& (colorPtr->id.colormap == id->colormap)
&& (colorPtr->liveRefCount == 0) && (colorPtr->numColors != 0)
&& ((colorPtr->id.palette != id->palette)
|| (colorPtr->id.gamma != id->gamma))) {
/*
* Free the colors that this ColorTable has.
*/
XFreeColors(colorPtr->id.display, colorPtr->id.colormap,
colorPtr->pixelMap, colorPtr->numColors, 0);
numColors -= colorPtr->numColors;
colorPtr->numColors = 0;
ckfree((char *) colorPtr->pixelMap);
colorPtr->pixelMap = NULL;
}
entry = Tcl_NextHashEntry(&srch);
}
return 1; /* we freed some colors */
}
/*
*----------------------------------------------------------------------
*
* DisposeInstance --
*
* This procedure is called to finally free up an instance
* of a photo image which is no longer required.
*
* Results:
* None.
*
* Side effects:
* The instance data structure and the resources it references
* are freed.
*
*----------------------------------------------------------------------
*/
static void
DisposeInstance(clientData)
ClientData clientData; /* Pointer to the instance whose resources
* are to be released. */
{
PhotoInstance *instancePtr = (PhotoInstance *) clientData;
PhotoInstance *prevPtr;
if (instancePtr->pixels != None) {
Tk_FreePixmap(instancePtr->display, instancePtr->pixels);
}
if (instancePtr->gc != None) {
Tk_FreeGC(instancePtr->display, instancePtr->gc);
}
if (instancePtr->imagePtr != NULL) {
XFree((char *) instancePtr->imagePtr);
}
if (instancePtr->error != NULL) {
ckfree((char *) instancePtr->error);
}
if (instancePtr->colorTablePtr != NULL) {
FreeColorTable(instancePtr->colorTablePtr, 1);
}
if (instancePtr->masterPtr->instancePtr == instancePtr) {
instancePtr->masterPtr->instancePtr = instancePtr->nextPtr;
} else {
for (prevPtr = instancePtr->masterPtr->instancePtr;
prevPtr->nextPtr != instancePtr; prevPtr = prevPtr->nextPtr) {
/* Empty loop body */
}
prevPtr->nextPtr = instancePtr->nextPtr;
}
Tk_FreeColormap(instancePtr->display, instancePtr->colormap);
ckfree((char *) instancePtr);
}
/*
*----------------------------------------------------------------------
*
* MatchFileFormat --
*
* This procedure is called to find a photo image file format
* handler which can parse the image data in the given file.
* If a user-specified format string is provided, only handlers
* whose names match a prefix of the format string are tried.
*
* Results:
* A standard TCL return value. If the return value is TCL_OK, a
* pointer to the image format record is returned in
* *imageFormatPtr, and the width and height of the image are
* returned in *widthPtr and *heightPtr.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
char *
Tk_PhotoFormatName(interp, formatString)
Tcl_Interp *interp; /* Interpreter to use for reporting errors. */
Arg formatString; /* User-specified format string, or NULL. */
{
int objc = 0;
Tcl_Obj **objv;
if (formatString != NULL &&
Tcl_ListObjGetElements(interp, formatString, &objc, &objv) == TCL_OK &&
objc != 0) {
return LangString(objv[0]);
}
return NULL;
}
static int
MatchFileFormat(interp, chan, fileName, formatString, imageFormatPtr,
widthPtr, heightPtr)
Tcl_Interp *interp; /* Interpreter to use for reporting errors. */
Tcl_Channel chan; /* The image file, open for reading. */
Tcl_Obj *fileName; /* The name of the image file. */
Tcl_Obj *formatString; /* User-specified format string, or NULL. */
Tk_PhotoImageFormat **imageFormatPtr;
/* A pointer to the photo image format
* record is returned here. */
int *widthPtr, *heightPtr; /* The dimensions of the image are
* returned here. */
{
int matched;
Tk_PhotoImageFormat *formatPtr;
char *formatName = Tk_PhotoFormatName(interp, formatString);
/*
* Scan through the table of file format handlers to find
* one which can handle the image.
*/
matched = 0;
for (formatPtr = formatList; formatPtr != NULL;
formatPtr = formatPtr->nextPtr) {
if (formatString != NULL) {
if (strncasecmp(formatName,
formatPtr->name, strlen(formatPtr->name)) != 0) {
continue;
}
matched = 1;
if (formatPtr->fileMatchProc == NULL) {
Tcl_AppendResult(interp, "-file option isn't supported for ",
formatPtr->name, " images", (char *) NULL);
return TCL_ERROR;
}
}
if (formatPtr->fileMatchProc != NULL) {
(void) Tcl_Seek(chan, 0L, SEEK_SET);
if ((*formatPtr->fileMatchProc)(interp, chan, fileName, formatString,
widthPtr, heightPtr)) {
if (*widthPtr < 1) {
*widthPtr = 1;
}
if (*heightPtr < 1) {
*heightPtr = 1;
}
break;
}
}
}
if (formatPtr == NULL) {
if ((formatString != NULL) && !matched) {
Tcl_AppendResult(interp, "image file format \"",
Tcl_GetStringFromObj(formatString, NULL),
"\" is not supported", (char *) NULL);
} else {
Tcl_AppendResult(interp,
"couldn't recognize data in image file \"",
fileName, "\"", (char *) NULL);
}
return TCL_ERROR;
}
*imageFormatPtr = formatPtr;
(void) Tcl_Seek(chan, 0L, SEEK_SET);
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* MatchStringFormat --
*
* This procedure is called to find a photo image file format
* handler which can parse the image data in the given string.
* If a user-specified format string is provided, only handlers
* whose names match a prefix of the format string are tried.
*
* Results:
* A standard TCL return value. If the return value is TCL_OK, a
* pointer to the image format record is returned in
* *imageFormatPtr, and the width and height of the image are
* returned in *widthPtr and *heightPtr.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
MatchStringFormat(interp, data, formatString, imageFormatPtr,
widthPtr, heightPtr)
Tcl_Interp *interp; /* Interpreter to use for reporting errors. */
Tcl_Obj *data; /* Object containing the image data. */
Tcl_Obj *formatString; /* User-specified format string, or NULL. */
Tk_PhotoImageFormat **imageFormatPtr;
/* A pointer to the photo image format
* record is returned here. */
int *widthPtr, *heightPtr; /* The dimensions of the image are
* returned here. */
{
int matched;
Tk_PhotoImageFormat *formatPtr;
char *formatName = Tk_PhotoFormatName(interp, formatString);
/*
* Scan through the table of file format handlers to find
* one which can handle the image.
*/
matched = 0;
for (formatPtr = formatList; formatPtr != NULL;
formatPtr = formatPtr->nextPtr) {
if (formatString != NULL) {
if (strncasecmp(formatName,
formatPtr->name, strlen(formatPtr->name)) != 0) {
continue;
}
matched = 1;
if (formatPtr->stringMatchProc == NULL) {
Tcl_AppendResult(interp, "-data option isn't supported for ",
formatPtr->name, " images", (char *) NULL);
return TCL_ERROR;
}
}
if ((formatPtr->stringMatchProc != NULL)
&& (formatPtr->stringReadProc != NULL)
&& (*formatPtr->stringMatchProc)(interp, data, formatString,
widthPtr, heightPtr)) {
break;
}
}
if (formatPtr == NULL) {
if ((formatString != NULL) && !matched) {
Tcl_AppendResult(interp, "image format \"",
Tcl_GetStringFromObj(formatString, NULL),
"\" is not supported", (char *) NULL);
} else {
Tcl_AppendResult(interp, "couldn't recognize image data",
(char *) NULL);
}
return TCL_ERROR;
}
*imageFormatPtr = formatPtr;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tk_FindPhoto --
*
* This procedure is called to get an opaque handle (actually a
* PhotoMaster *) for a given image, which can be used in
* subsequent calls to Tk_PhotoPutBlock, etc. The `name'
* parameter is the name of the image.
*
* Results:
* The handle for the photo image, or NULL if there is no
* photo image with the name given.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
Tk_PhotoHandle
Tk_FindPhoto(interp, imageName)
Tcl_Interp *interp; /* Interpreter (application) in which image
* exists. */
char *imageName; /* Name of the desired photo image. */
{
ClientData clientData;
Tk_ImageType *typePtr;
clientData = Tk_GetImageMasterData(interp, imageName, &typePtr);
if (typePtr != &tkPhotoImageType) {
return NULL;
}
return (Tk_PhotoHandle) clientData;
}
/*
*----------------------------------------------------------------------
*
* Tk_PhotoPutBlock --
*
* This procedure is called to put image data into a photo image.
*
* Results:
* None.
*
* Side effects:
* The image data is stored. The image may be expanded.
* The Tk image code is informed that the image has changed.
*
*---------------------------------------------------------------------- */
void
Tk_PhotoPutBlock(handle, blockPtr, x, y, width, height)
Tk_PhotoHandle handle; /* Opaque handle for the photo image
* to be updated. */
register Tk_PhotoImageBlock *blockPtr;
/* Pointer to a structure describing the
* pixel data to be copied into the image. */
int x, y; /* Coordinates of the top-left pixel to
* be updated in the image. */
int width, height; /* Dimensions of the area of the image
* to be updated. */
{
register PhotoMaster *masterPtr;
int xEnd, yEnd;
int greenOffset, blueOffset, alphaOffset;
int wLeft, hLeft;
int wCopy, hCopy;
unsigned char *srcPtr, *srcLinePtr;
unsigned char *destPtr, *destLinePtr;
int pitch;
XRectangle rect;
masterPtr = (PhotoMaster *) handle;
if ((masterPtr->userWidth != 0) && ((x + width) > masterPtr->userWidth)) {
width = masterPtr->userWidth - x;
}
if ((masterPtr->userHeight != 0)
&& ((y + height) > masterPtr->userHeight)) {
height = masterPtr->userHeight - y;
}
if ((width <= 0) || (height <= 0))
return;
xEnd = x + width;
yEnd = y + height;
if ((xEnd > masterPtr->width) || (yEnd > masterPtr->height)) {
ImgPhotoSetSize(masterPtr, MAX(xEnd, masterPtr->width),
MAX(yEnd, masterPtr->height));
}
if ((y < masterPtr->ditherY) || ((y == masterPtr->ditherY)
&& (x < masterPtr->ditherX))) {
/*
* The dithering isn't correct past the start of this block.
*/
masterPtr->ditherX = x;
masterPtr->ditherY = y;
}
/*
* If this image block could have different red, green and blue
* components, mark it as a color image.
*/
greenOffset = blockPtr->offset[1] - blockPtr->offset[0];
blueOffset = blockPtr->offset[2] - blockPtr->offset[0];
alphaOffset = 0;
while ((alphaOffset == blockPtr->offset[0]) ||
(alphaOffset == blockPtr->offset[1]) ||
(alphaOffset == blockPtr->offset[2])) {
alphaOffset++;
}
if (alphaOffset >= blockPtr->pixelSize) {
alphaOffset = 0;
} else {
alphaOffset -= blockPtr->offset[0];
}
if ((greenOffset != 0) || (blueOffset != 0)) {
masterPtr->flags |= COLOR_IMAGE;
}
/*
* Copy the data into our local 24-bit/pixel array.
* If we can do it with a single memcpy, we do.
*/
destLinePtr = masterPtr->pix24 + (y * masterPtr->width + x) * 4;
pitch = masterPtr->width * 4;
if ((blockPtr->pixelSize == 4) && (greenOffset == 1) && (blueOffset == 2) && (alphaOffset == 0)
&& (width <= blockPtr->width) && (height <= blockPtr->height)
&& ((height == 1) || ((x == 0) && (width == masterPtr->width)
&& (blockPtr->pitch == pitch)))) {
memcpy((VOID *) destLinePtr,
(VOID *) (blockPtr->pixelPtr + blockPtr->offset[0]),
(size_t) (height * width * 4));
} else {
for (hLeft = height; hLeft > 0;) {
srcLinePtr = blockPtr->pixelPtr + blockPtr->offset[0];
hCopy = MIN(hLeft, blockPtr->height);
hLeft -= hCopy;
for (; hCopy > 0; --hCopy) {
destPtr = destLinePtr;
for (wLeft = width; wLeft > 0;) {
wCopy = MIN(wLeft, blockPtr->width);
wLeft -= wCopy;
srcPtr = srcLinePtr;
for (; wCopy > 0; --wCopy) {
if (!destPtr[3]) {
destPtr[0] = destPtr[1] = destPtr[2] = 0xd9;
}
if (!alphaOffset || (srcPtr[alphaOffset] == 255)) {
*destPtr++ = srcPtr[0];
*destPtr++ = srcPtr[greenOffset];
*destPtr++ = srcPtr[blueOffset];
*destPtr++ = 255;
} else {
if (srcPtr[alphaOffset]) {
destPtr[0] += (srcPtr[0] - destPtr[0]) * srcPtr[alphaOffset] / 255;
destPtr[1] += (srcPtr[greenOffset] - destPtr[1]) * srcPtr[alphaOffset] / 255;
destPtr[2] += (srcPtr[blueOffset] - destPtr[2]) * srcPtr[alphaOffset] / 255;
destPtr[3] += (255 - destPtr[3]) * srcPtr[alphaOffset] / 255;
}
destPtr+=4;
}
srcPtr += blockPtr->pixelSize;
}
}
srcLinePtr += blockPtr->pitch;
destLinePtr += pitch;
}
}
}
/*
* Add this new block to the region which specifies which data is valid.
*/
if (alphaOffset) {
int x1, y1, end;
destLinePtr = masterPtr->pix24 + (y * masterPtr->width + x) * 4 + 3;
for (y1 = 0; y1 < height; y1++) {
x1 = 0;
destPtr = destLinePtr;
while (x1 < width) {
/* search for first non-transparent pixel */
while ((x1 < width) && !*destPtr) {
x1++; destPtr += 4;
}
end = x1;
/* search for first transparent pixel */
while ((end < width) && *destPtr) {
end++; destPtr += 4;
}
if (end > x1) {
rect.x = x + x1;
rect.y = y + y1;
rect.width = end - x1;
rect.height = 1;
TkUnionRectWithRegion(&rect, masterPtr->validRegion,
masterPtr->validRegion);
}
x1 = end;
}
destLinePtr += masterPtr->width * 4;
}
} else {
rect.x = x;
rect.y = y;
rect.width = width;
rect.height = height;
TkUnionRectWithRegion(&rect, masterPtr->validRegion,
masterPtr->validRegion);
}
/*
* Update each instance.
*/
Tk_DitherPhoto((Tk_PhotoHandle) masterPtr, x, y, width, height);
/*
* Tell the core image code that this image has changed.
*/
Tk_ImageChanged(masterPtr->tkMaster, x, y, width, height, masterPtr->width,
masterPtr->height);
}
/*
*----------------------------------------------------------------------
*
* Tk_PhotoPutZoomedBlock --
*
* This procedure is called to put image data into a photo image,
* with possible subsampling and/or zooming of the pixels.
*
* Results:
* None.
*
* Side effects:
* The image data is stored. The image may be expanded.
* The Tk image code is informed that the image has changed.
*
*----------------------------------------------------------------------
*/
void
Tk_PhotoPutZoomedBlock(handle, blockPtr, x, y, width, height, zoomX, zoomY,
subsampleX, subsampleY)
Tk_PhotoHandle handle; /* Opaque handle for the photo image
* to be updated. */
register Tk_PhotoImageBlock *blockPtr;
/* Pointer to a structure describing the
* pixel data to be copied into the image. */
int x, y; /* Coordinates of the top-left pixel to
* be updated in the image. */
int width, height; /* Dimensions of the area of the image
* to be updated. */
int zoomX, zoomY; /* Zoom factors for the X and Y axes. */
int subsampleX, subsampleY; /* Subsampling factors for the X and Y axes. */
{
register PhotoMaster *masterPtr;
int xEnd, yEnd;
int greenOffset, blueOffset, alphaOffset;
int wLeft, hLeft;
int wCopy, hCopy;
int blockWid, blockHt;
unsigned char *srcPtr, *srcLinePtr, *srcOrigPtr;
unsigned char *destPtr, *destLinePtr;
int pitch;
int xRepeat, yRepeat;
int blockXSkip, blockYSkip;
XRectangle rect;
if ((zoomX == 1) && (zoomY == 1) && (subsampleX == 1)
&& (subsampleY == 1)) {
Tk_PhotoPutBlock(handle, blockPtr, x, y, width, height);
return;
}
masterPtr = (PhotoMaster *) handle;
if ((zoomX <= 0) || (zoomY <= 0))
return;
if ((masterPtr->userWidth != 0) && ((x + width) > masterPtr->userWidth)) {
width = masterPtr->userWidth - x;
}
if ((masterPtr->userHeight != 0)
&& ((y + height) > masterPtr->userHeight)) {
height = masterPtr->userHeight - y;
}
if ((width <= 0) || (height <= 0))
return;
xEnd = x + width;
yEnd = y + height;
if ((xEnd > masterPtr->width) || (yEnd > masterPtr->height)) {
int sameSrc = (blockPtr->pixelPtr == masterPtr->pix24);
ImgPhotoSetSize(masterPtr, MAX(xEnd, masterPtr->width),
MAX(yEnd, masterPtr->height));
if (sameSrc) {
blockPtr->pixelPtr = masterPtr->pix24;
}
}
if ((y < masterPtr->ditherY) || ((y == masterPtr->ditherY)
&& (x < masterPtr->ditherX))) {
/*
* The dithering isn't correct past the start of this block.
*/
masterPtr->ditherX = x;
masterPtr->ditherY = y;
}
/*
* If this image block could have different red, green and blue
* components, mark it as a color image.
*/
greenOffset = blockPtr->offset[1] - blockPtr->offset[0];
blueOffset = blockPtr->offset[2] - blockPtr->offset[0];
alphaOffset = 0;
while ((alphaOffset == blockPtr->offset[0]) ||
(alphaOffset == blockPtr->offset[1]) ||
(alphaOffset == blockPtr->offset[2])) {
alphaOffset++;
}
if (alphaOffset >= blockPtr->pixelSize) {
alphaOffset = 0;
} else {
alphaOffset -= blockPtr->offset[0];
}
if ((greenOffset != 0) || (blueOffset != 0)) {
masterPtr->flags |= COLOR_IMAGE;
}
/*
* Work out what area the pixel data in the block expands to after
* subsampling and zooming.
*/
blockXSkip = subsampleX * blockPtr->pixelSize;
blockYSkip = subsampleY * blockPtr->pitch;
if (subsampleX > 0)
blockWid = ((blockPtr->width + subsampleX - 1) / subsampleX) * zoomX;
else if (subsampleX == 0)
blockWid = width;
else
blockWid = ((blockPtr->width - subsampleX - 1) / -subsampleX) * zoomX;
if (subsampleY > 0)
blockHt = ((blockPtr->height + subsampleY - 1) / subsampleY) * zoomY;
else if (subsampleY == 0)
blockHt = height;
else
blockHt = ((blockPtr->height - subsampleY - 1) / -subsampleY) * zoomY;
/*
* Copy the data into our local 24-bit/pixel array.
*/
destLinePtr = masterPtr->pix24 + (y * masterPtr->width + x) * 4;
srcOrigPtr = blockPtr->pixelPtr + blockPtr->offset[0];
if (subsampleX < 0) {
srcOrigPtr += (blockPtr->width - 1) * blockPtr->pixelSize;
}
if (subsampleY < 0) {
srcOrigPtr += (blockPtr->height - 1) * blockPtr->pitch;
}
pitch = masterPtr->width * 4;
for (hLeft = height; hLeft > 0; ) {
hCopy = MIN(hLeft, blockHt);
hLeft -= hCopy;
yRepeat = zoomY;
srcLinePtr = srcOrigPtr;
for (; hCopy > 0; --hCopy) {
destPtr = destLinePtr;
for (wLeft = width; wLeft > 0;) {
wCopy = MIN(wLeft, blockWid);
wLeft -= wCopy;
srcPtr = srcLinePtr;
for (; wCopy > 0; wCopy -= zoomX) {
for (xRepeat = MIN(wCopy, zoomX); xRepeat > 0; xRepeat--) {
if (!destPtr[3]) {
destPtr[0] = destPtr[1] = destPtr[2] = 0xd9;
}
if (!alphaOffset || (srcPtr[alphaOffset] == 255)) {
*destPtr++ = srcPtr[0];
*destPtr++ = srcPtr[greenOffset];
*destPtr++ = srcPtr[blueOffset];
*destPtr++ = 255;
} else {
if (srcPtr[alphaOffset]) {
destPtr[0] += (srcPtr[0] - destPtr[0]) * srcPtr[alphaOffset] / 255;
destPtr[1] += (srcPtr[greenOffset] - destPtr[1]) * srcPtr[alphaOffset] / 255;
destPtr[2] += (srcPtr[blueOffset] - destPtr[2]) * srcPtr[alphaOffset] / 255;
destPtr[3] += (255 - destPtr[3]) * srcPtr[alphaOffset] / 255;
}
destPtr+=4;
}
}
srcPtr += blockXSkip;
}
}
destLinePtr += pitch;
yRepeat--;
if (yRepeat <= 0) {
srcLinePtr += blockYSkip;
yRepeat = zoomY;
}
}
}
/*
* Add this new block to the region that specifies which data is valid.
*/
if (alphaOffset) {
int x1, y1, end;
destLinePtr = masterPtr->pix24 + (y * masterPtr->width + x) * 4 + 3;
for (y1 = 0; y1 < height; y1++) {
x1 = 0;
destPtr = destLinePtr;
while (x1 < width) {
/* search for first non-transparent pixel */
while ((x1 < width) && !*destPtr) {
x1++; destPtr += 4;
}
end = x1;
/* search for first transparent pixel */
while ((end < width) && *destPtr) {
end++; destPtr += 4;
}
if (end > x1) {
rect.x = x + x1;
rect.y = y + y1;
rect.width = end - x1;
rect.height = 1;
TkUnionRectWithRegion(&rect, masterPtr->validRegion,
masterPtr->validRegion);
}
x1 = end;
}
destLinePtr += masterPtr->width * 4;
}
} else {
rect.x = x;
rect.y = y;
rect.width = width;
rect.height = height;
TkUnionRectWithRegion(&rect, masterPtr->validRegion,
masterPtr->validRegion);
}
/*
* Update each instance.
*/
Tk_DitherPhoto((Tk_PhotoHandle) masterPtr, x, y, width, height);
/*
* Tell the core image code that this image has changed.
*/
Tk_ImageChanged(masterPtr->tkMaster, x, y, width, height, masterPtr->width,
masterPtr->height);
}
/*
*----------------------------------------------------------------------
*
* Tk_DitherPhoto --
*
* This procedure is called to update an area of each instance's
* pixmap by dithering the corresponding area of the image master.
*
* Results:
* None.
*
* Side effects:
* The pixmap of each instance of this image gets updated.
* The fields in *masterPtr indicating which area of the image
* is correctly dithered get updated.
*
*----------------------------------------------------------------------
*/
void
Tk_DitherPhoto(photo, x, y, width, height)
Tk_PhotoHandle photo; /* Image master whose instances are
* to be updated. */
int x, y; /* Coordinates of the top-left pixel
* in the area to be dithered. */
int width, height; /* Dimensions of the area to be dithered. */
{
PhotoMaster *masterPtr = (PhotoMaster *) photo;
PhotoInstance *instancePtr;
if ((width <= 0) || (height <= 0)) {
return;
}
for (instancePtr = masterPtr->instancePtr; instancePtr != NULL;
instancePtr = instancePtr->nextPtr) {
DitherInstance(instancePtr, x, y, width, height);
}
/*
* Work out whether this block will be correctly dithered
* and whether it will extend the correctly dithered region.
*/
if (((y < masterPtr->ditherY)
|| ((y == masterPtr->ditherY) && (x <= masterPtr->ditherX)))
&& ((y + height) > (masterPtr->ditherY))) {
/*
* This block starts inside (or immediately after) the correctly
* dithered region, so the first scan line at least will be right.
* Furthermore this block extends into scanline masterPtr->ditherY.
*/
if ((x == 0) && (width == masterPtr->width)) {
/*
* We are doing the full width, therefore the dithering
* will be correct to the end.
*/
masterPtr->ditherX = 0;
masterPtr->ditherY = y + height;
} else {
/*
* We are doing partial scanlines, therefore the
* correctly-dithered region will be extended by
* at most one scan line.
*/
if (x <= masterPtr->ditherX) {
masterPtr->ditherX = x + width;
if (masterPtr->ditherX >= masterPtr->width) {
masterPtr->ditherX = 0;
masterPtr->ditherY++;
}
}
}
}
}
/*
*----------------------------------------------------------------------
*
* DitherInstance --
*
* This procedure is called to update an area of an instance's
* pixmap by dithering the corresponding area of the master.
*
* Results:
* None.
*
* Side effects:
* The instance's pixmap gets updated.
*
*----------------------------------------------------------------------
*/
static void
DitherInstance(instancePtr, xStart, yStart, width, height)
PhotoInstance *instancePtr; /* The instance to be updated. */
int xStart, yStart; /* Coordinates of the top-left pixel in the
* block to be dithered. */
int width, height; /* Dimensions of the block to be dithered. */
{
PhotoMaster *masterPtr;
ColorTable *colorPtr;
XImage *imagePtr;
int nLines, bigEndian;
int i, c, x, y;
int xEnd, yEnd;
int bitsPerPixel, bytesPerLine, lineLength;
unsigned char *srcLinePtr, *srcPtr;
schar *errLinePtr, *errPtr;
unsigned char *destBytePtr, *dstLinePtr;
pixel *destLongPtr;
pixel firstBit, word, mask;
int col[3];
int doDithering = 1;
colorPtr = instancePtr->colorTablePtr;
masterPtr = instancePtr->masterPtr;
/*
* Turn dithering off in certain cases where it is not
* needed (TrueColor, DirectColor with many colors).
*/
if ((colorPtr->visualInfo.class == DirectColor)
|| (colorPtr->visualInfo.class == TrueColor)) {
int nRed, nGreen, nBlue, result;
result = sscanf(colorPtr->id.palette, "%d/%d/%d", &nRed,
&nGreen, &nBlue);
if ((nRed >= 256)
&& ((result == 1) || ((nGreen >= 256) && (nBlue >= 256)))) {
doDithering = 0;
}
}
/*
* First work out how many lines to do at a time,
* then how many bytes we'll need for pixel storage,
* and allocate it.
*/
nLines = (MAX_PIXELS + width - 1) / width;
if (nLines < 1) {
nLines = 1;
}
if (nLines > height ) {
nLines = height;
}
imagePtr = instancePtr->imagePtr;
if (imagePtr == NULL) {
return; /* we must be really tight on memory */
}
bitsPerPixel = imagePtr->bits_per_pixel;
bytesPerLine = ((bitsPerPixel * width + 31) >> 3) & ~3;
imagePtr->width = width;
imagePtr->height = nLines;
imagePtr->bytes_per_line = bytesPerLine;
imagePtr->data = (char *) ckalloc((unsigned) (imagePtr->bytes_per_line * nLines));
bigEndian = imagePtr->bitmap_bit_order == MSBFirst;
firstBit = bigEndian? (1 << (imagePtr->bitmap_unit - 1)): 1;
lineLength = masterPtr->width * 3;
srcLinePtr = masterPtr->pix24 + (yStart * masterPtr->width + xStart) * 4;
errLinePtr = instancePtr->error + yStart * lineLength + xStart * 3;
xEnd = xStart + width;
/*
* Loop over the image, doing at most nLines lines before
* updating the screen image.
*/
for (; height > 0; height -= nLines) {
if (nLines > height) {
nLines = height;
}
dstLinePtr = (unsigned char *) imagePtr->data;
yEnd = yStart + nLines;
for (y = yStart; y < yEnd; ++y) {
srcPtr = srcLinePtr;
errPtr = errLinePtr;
destBytePtr = dstLinePtr;
destLongPtr = (pixel *) dstLinePtr;
if (colorPtr->flags & TK_COLOR_WINDOW) {
/*
* Color window. We dither the three components
* independently, using Floyd-Steinberg dithering,
* which propagates errors from the quantization of
* pixels to the pixels below and to the right.
*/
for (x = xStart; x < xEnd; ++x) {
if (doDithering) {
for (i = 0; i < 3; ++i) {
/*
* Compute the error propagated into this pixel
* for this component.
* If e[x,y] is the array of quantization error
* values, we compute
* 7/16 * e[x-1,y] + 1/16 * e[x-1,y-1]
* + 5/16 * e[x,y-1] + 3/16 * e[x+1,y-1]
* and round it to an integer.
*
* The expression ((c + 2056) >> 4) - 128
* computes round(c / 16), and works correctly on
* machines without a sign-extending right shift.
*/
c = (x > 0) ? errPtr[-3] * 7: 0;
if (y > 0) {
if (x > 0) {
c += errPtr[-lineLength-3];
}
c += errPtr[-lineLength] * 5;
if ((x + 1) < masterPtr->width) {
c += errPtr[-lineLength+3] * 3;
}
}
/*
* Add the propagated error to the value of this
* component, quantize it, and store the
* quantization error.
*/
c = ((c + 2056) >> 4) - 128 + *srcPtr++;
if (c < 0) {
c = 0;
} else if (c > 255) {
c = 255;
}
col[i] = colorPtr->colorQuant[i][c];
*errPtr++ = c - col[i];
}
} else {
/*
* Output is virtually continuous in this case,
* so don't bother dithering.
*/
col[0] = *srcPtr++;
col[1] = *srcPtr++;
col[2] = *srcPtr++;
}
srcPtr++;
/*
* Translate the quantized component values into
* an X pixel value, and store it in the image.
*/
i = colorPtr->redValues[col[0]]
+ colorPtr->greenValues[col[1]]
+ colorPtr->blueValues[col[2]];
if (colorPtr->flags & MAP_COLORS) {
i = colorPtr->pixelMap[i];
}
switch (bitsPerPixel) {
case NBBY:
*destBytePtr++ = i;
break;
#ifndef __WIN32__
/*
* This case is not valid for Windows because the image format is different
* from the pixel format in Win32. Eventually we need to fix the image
* code in Tk to use the Windows native image ordering. This would speed
* up the image code for all of the common sizes.
*/
case NBBY * sizeof(pixel):
*destLongPtr++ = i;
break;
#endif
default:
XPutPixel(imagePtr, x - xStart, y - yStart,
(unsigned) i);
}
}
} else if (bitsPerPixel > 1) {
/*
* Multibit monochrome window. The operation here is similar
* to the color window case above, except that there is only
* one component. If the master image is in color, use the
* luminance computed as
* 0.344 * red + 0.5 * green + 0.156 * blue.
*/
for (x = xStart; x < xEnd; ++x) {
c = (x > 0) ? errPtr[-1] * 7: 0;
if (y > 0) {
if (x > 0) {
c += errPtr[-lineLength-1];
}
c += errPtr[-lineLength] * 5;
if (x + 1 < masterPtr->width) {
c += errPtr[-lineLength+1] * 3;
}
}
c = ((c + 2056) >> 4) - 128;
if ((masterPtr->flags & COLOR_IMAGE) == 0) {
c += srcPtr[0];
} else {
c += (unsigned)(srcPtr[0] * 11 + srcPtr[1] * 16
+ srcPtr[2] * 5 + 16) >> 5;
}
srcPtr += 4;
if (c < 0) {
c = 0;
} else if (c > 255) {
c = 255;
}
i = colorPtr->colorQuant[0][c];
*errPtr++ = c - i;
i = colorPtr->redValues[i];
switch (bitsPerPixel) {
case NBBY:
*destBytePtr++ = i;
break;
#ifndef __WIN32__
/*
* This case is not valid for Windows because the image format is different
* from the pixel format in Win32. Eventually we need to fix the image
* code in Tk to use the Windows native image ordering. This would speed
* up the image code for all of the common sizes.
*/
case NBBY * sizeof(pixel):
*destLongPtr++ = i;
break;
#endif
default:
XPutPixel(imagePtr, x - xStart, y - yStart,
(unsigned) i);
}
}
} else {
/*
* 1-bit monochrome window. This is similar to the
* multibit monochrome case above, except that the
* quantization is simpler (we only have black = 0
* and white = 255), and we produce an XY-Bitmap.
*/
word = 0;
mask = firstBit;
for (x = xStart; x < xEnd; ++x) {
/*
* If we have accumulated a whole word, store it
* in the image and start a new word.
*/
if (mask == 0) {
*destLongPtr++ = word;
mask = firstBit;
word = 0;
}
c = (x > 0) ? errPtr[-1] * 7: 0;
if (y > 0) {
if (x > 0) {
c += errPtr[-lineLength-1];
}
c += errPtr[-lineLength] * 5;
if (x + 1 < masterPtr->width) {
c += errPtr[-lineLength+1] * 3;
}
}
c = ((c + 2056) >> 4) - 128;
if ((masterPtr->flags & COLOR_IMAGE) == 0) {
c += srcPtr[0];
} else {
c += (unsigned)(srcPtr[0] * 11 + srcPtr[1] * 16
+ srcPtr[2] * 5 + 16) >> 5;
}
srcPtr += 4;
if (c < 0) {
c = 0;
} else if (c > 255) {
c = 255;
}
if (c >= 128) {
word |= mask;
*errPtr++ = c - 255;
} else {
*errPtr++ = c;
}
mask = bigEndian? (mask >> 1): (mask << 1);
}
*destLongPtr = word;
}
srcLinePtr += masterPtr->width * 4;
errLinePtr += lineLength;
dstLinePtr += bytesPerLine;
}
/*
* Update the pixmap for this instance with the block of
* pixels that we have just computed.
*/
TkPutImage(colorPtr->pixelMap, colorPtr->numColors,
instancePtr->display, instancePtr->pixels,
instancePtr->gc, imagePtr, 0, 0, xStart, yStart,
(unsigned) width, (unsigned) nLines);
yStart = yEnd;
}
ckfree(imagePtr->data);
imagePtr->data = NULL;
}
/*
*----------------------------------------------------------------------
*
* Tk_PhotoBlank --
*
* This procedure is called to clear an entire photo image.
*
* Results:
* None.
*
* Side effects:
* The valid region for the image is set to the null region.
* The generic image code is notified that the image has changed.
*
*----------------------------------------------------------------------
*/
void
Tk_PhotoBlank(handle)
Tk_PhotoHandle handle; /* Handle for the image to be blanked. */
{
PhotoMaster *masterPtr;
PhotoInstance *instancePtr;
masterPtr = (PhotoMaster *) handle;
masterPtr->ditherX = masterPtr->ditherY = 0;
masterPtr->flags = 0;
/*
* The image has valid data nowhere.
*/
if (masterPtr->validRegion != NULL) {
TkDestroyRegion(masterPtr->validRegion);
}
masterPtr->validRegion = TkCreateRegion();
/*
* Clear out the 24-bit pixel storage array.
* Clear out the dithering error arrays for each instance.
*/
memset((VOID *) masterPtr->pix24, 0,
(size_t) (masterPtr->width * masterPtr->height * 4));
for (instancePtr = masterPtr->instancePtr; instancePtr != NULL;
instancePtr = instancePtr->nextPtr) {
if (instancePtr->error) {
memset((VOID *) instancePtr->error, 0,
(size_t) (masterPtr->width * masterPtr->height
* 3 * sizeof(schar)));
}
}
/*
* Tell the core image code that this image has changed.
*/
Tk_ImageChanged(masterPtr->tkMaster, 0, 0, masterPtr->width,
masterPtr->height, masterPtr->width, masterPtr->height);
}
/*
*----------------------------------------------------------------------
*
* Tk_PhotoExpand --
*
* This procedure is called to request that a photo image be
* expanded if necessary to be at least `width' pixels wide and
* `height' pixels high. If the user has declared a definite
* image size (using the -width and -height configuration
* options) then this call has no effect.
*
* Results:
* None.
*
* Side effects:
* The size of the photo image may change; if so the generic
* image code is informed.
*
*----------------------------------------------------------------------
*/
void
Tk_PhotoExpand(handle, width, height)
Tk_PhotoHandle handle; /* Handle for the image to be expanded. */
int width, height; /* Desired minimum dimensions of the image. */
{
PhotoMaster *masterPtr;
masterPtr = (PhotoMaster *) handle;
if (width <= masterPtr->width) {
width = masterPtr->width;
}
if (height <= masterPtr->height) {
height = masterPtr->height;
}
if ((width != masterPtr->width) || (height != masterPtr->height)) {
ImgPhotoSetSize(masterPtr, MAX(width, masterPtr->width),
MAX(height, masterPtr->height));
Tk_ImageChanged(masterPtr->tkMaster, 0, 0, 0, 0, masterPtr->width,
masterPtr->height);
}
}
/*
*----------------------------------------------------------------------
*
* Tk_PhotoGetSize --
*
* This procedure is called to obtain the current size of a photo
* image.
*
* Results:
* The image's width and height are returned in *widthp
* and *heightp.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
void
Tk_PhotoGetSize(handle, widthPtr, heightPtr)
Tk_PhotoHandle handle; /* Handle for the image whose dimensions
* are requested. */
int *widthPtr, *heightPtr; /* The dimensions of the image are returned
* here. */
{
PhotoMaster *masterPtr;
masterPtr = (PhotoMaster *) handle;
*widthPtr = masterPtr->width;
*heightPtr = masterPtr->height;
}
/*
*----------------------------------------------------------------------
*
* Tk_PhotoSetSize --
*
* This procedure is called to set size of a photo image.
* This call is equivalent to using the -width and -height
* configuration options.
*
* Results:
* None.
*
* Side effects:
* The size of the image may change; if so the generic
* image code is informed.
*
*----------------------------------------------------------------------
*/
void
Tk_PhotoSetSize(handle, width, height)
Tk_PhotoHandle handle; /* Handle for the image whose size is to
* be set. */
int width, height; /* New dimensions for the image. */
{
PhotoMaster *masterPtr;
masterPtr = (PhotoMaster *) handle;
masterPtr->userWidth = width;
masterPtr->userHeight = height;
ImgPhotoSetSize(masterPtr, ((width > 0) ? width: masterPtr->width),
((height > 0) ? height: masterPtr->height));
Tk_ImageChanged(masterPtr->tkMaster, 0, 0, 0, 0,
masterPtr->width, masterPtr->height);
}
/*
*----------------------------------------------------------------------
*
* ImgGetPhoto --
*
* This procedure is called to obtain image data from a photo
* image. This procedure fills in the Tk_PhotoImageBlock structure
* pointed to by `blockPtr' with details of the address and
* layout of the image data in memory.
*
* Results:
* A pointer to the allocated data which should be freed later.
* NULL if there is no need to free data because
* blockPtr->pixelPtr points directly to the image data.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static char *
ImgGetPhoto(masterPtr, blockPtr, optPtr)
PhotoMaster *masterPtr; /* Handle for the photo image from which
* image data is desired. */
Tk_PhotoImageBlock *blockPtr;
/* Information about the address and layout
* of the image data is returned here. */
struct SubcommandOptions *optPtr;
{
unsigned char *pixelPtr;
int x, y, greenOffset, blueOffset, alphaOffset;
Tk_PhotoGetImage((Tk_PhotoHandle) masterPtr, blockPtr);
blockPtr->pixelPtr += optPtr->fromY * blockPtr->pitch
+ optPtr->fromX * blockPtr->pixelSize;
blockPtr->width = optPtr->fromX2 - optPtr->fromX;
blockPtr->height = optPtr->fromY2 - optPtr->fromY;
if (!(masterPtr->flags & COLOR_IMAGE) &&
(!(optPtr->options & OPT_BACKGROUND)
|| ((optPtr->background->red == optPtr->background->green)
&& (optPtr->background->red == optPtr->background->blue)))) {
blockPtr->offset[0] = blockPtr->offset[1] =
blockPtr->offset[2];
}
alphaOffset = 0;
for (y = 0; y < blockPtr->height; y++) {
pixelPtr = blockPtr->pixelPtr + (y * blockPtr->pitch)
+ blockPtr->pixelSize - 1;
for (x = 0; x < blockPtr->width; x++) {
if (*pixelPtr != 255) {
alphaOffset = 3; break;
}
pixelPtr += blockPtr->pixelSize;
}
if (alphaOffset) break;
}
if (!alphaOffset) {
blockPtr->pixelPtr--;
blockPtr->offset[0]++;
blockPtr->offset[1]++;
blockPtr->offset[2]++;
}
greenOffset = blockPtr->offset[1] - blockPtr->offset[0];
blueOffset = blockPtr->offset[2] - blockPtr->offset[0];
if (((optPtr->options & OPT_BACKGROUND) && alphaOffset) ||
((optPtr->options & OPT_GRAYSCALE) && (greenOffset || blueOffset))) {
int newPixelSize,x,y;
unsigned char *srcPtr, *destPtr;
char *data;
newPixelSize = (!(optPtr->options & OPT_BACKGROUND) && alphaOffset) ? 2 : 1;
if ((greenOffset || blueOffset) && !(optPtr->options & OPT_GRAYSCALE)) {
newPixelSize += 2;
}
data = ckalloc(newPixelSize * blockPtr->width * blockPtr->height);
srcPtr = blockPtr->pixelPtr + blockPtr->offset[0];
destPtr = (unsigned char *) data;
if (!greenOffset && !blueOffset) {
for (y = blockPtr->height; y > 0; y--) {
for (x = blockPtr->width; x > 0; x--) {
*destPtr = *srcPtr;
srcPtr += blockPtr->pixelSize;
destPtr += newPixelSize;
}
srcPtr += blockPtr->pitch - (blockPtr->width * blockPtr->pixelSize);
}
} else if (optPtr->options & OPT_GRAYSCALE) {
for (y = blockPtr->height; y > 0; y--) {
for (x = blockPtr->width; x > 0; x--) {
*destPtr = (unsigned char) ((srcPtr[0] * 11 + srcPtr[1] * 16
+ srcPtr[2] * 5 + 16) >> 5);
srcPtr += blockPtr->pixelSize;
destPtr += newPixelSize;
}
srcPtr += blockPtr->pitch - (blockPtr->width * blockPtr->pixelSize);
}
} else {
for (y = blockPtr->height; y > 0; y--) {
for (x = blockPtr->width; x > 0; x--) {
destPtr[0] = srcPtr[0];
destPtr[1] = srcPtr[1];
destPtr[2] = srcPtr[2];
srcPtr += blockPtr->pixelSize;
destPtr += newPixelSize;
}
srcPtr += blockPtr->pitch - (blockPtr->width * blockPtr->pixelSize);
}
}
srcPtr = blockPtr->pixelPtr + alphaOffset;
destPtr = (unsigned char *) data;
if (!alphaOffset) {
/* nothing to be done */
} else if (optPtr->options & OPT_BACKGROUND) {
if (newPixelSize > 2) {
int red = optPtr->background->red>>8;
int green = optPtr->background->green>>8;
int blue = optPtr->background->blue>>8;
for (y = blockPtr->height; y > 0; y--) {
for (x = blockPtr->width; x > 0; x--) {
destPtr[0] += (unsigned char) (((255 - *srcPtr) *
(red-destPtr[0])) / 255);
destPtr[1] += (unsigned char) (((255 - *srcPtr) *
(green-destPtr[1])) / 255);
destPtr[2] += (unsigned char) (((255 - *srcPtr) *
(blue-destPtr[2])) / 255);
srcPtr += blockPtr->pixelSize;
destPtr += newPixelSize;
}
srcPtr += blockPtr->pitch - (blockPtr->width * blockPtr->pixelSize);
}
} else {
int gray = (unsigned char) (((optPtr->background->red>>8) * 11
+ (optPtr->background->green>>8) * 16
+ (optPtr->background->blue>>8) * 5 + 16) >> 5);
for (y = blockPtr->height; y > 0; y--) {
for (x = blockPtr->width; x > 0; x--) {
destPtr[0] += ((255 - *srcPtr) *
(gray-destPtr[0])) / 255;
srcPtr += blockPtr->pixelSize;
destPtr += newPixelSize;
}
srcPtr += blockPtr->pitch - (blockPtr->width * blockPtr->pixelSize);
}
}
} else {
destPtr += newPixelSize-1;
for (y = blockPtr->height; y > 0; y--) {
for (x = blockPtr->width; x > 0; x--) {
*destPtr = *srcPtr;
srcPtr += blockPtr->pixelSize;
destPtr += newPixelSize;
}
srcPtr += blockPtr->pitch - (blockPtr->width * blockPtr->pixelSize);
}
}
blockPtr->pixelPtr = (unsigned char *) data;
blockPtr->pixelSize = newPixelSize;
blockPtr->pitch = newPixelSize * blockPtr->width;
blockPtr->offset[0] = 0;
if (newPixelSize>2) {
blockPtr->offset[1]= 1;
blockPtr->offset[2]= 2;
} else {
blockPtr->offset[1]= 0;
blockPtr->offset[2]= 0;
}
return data;
}
return NULL;
}
/*
*----------------------------------------------------------------------
*
* ImgStringWrite --
*
* Default string write function. The data is formatted in
* the default format as accepted by the "<img> put" command.
*
* Results:
* A standard Tcl result.
*
* Side effects:
* See the user documentation.
*
*----------------------------------------------------------------------
*/
static int
ImgStringWrite (interp, dataPtr, formatString, blockPtr)
Tcl_Interp *interp;
Tcl_DString *dataPtr;
Tcl_Obj *formatString;
Tk_PhotoImageBlock *blockPtr;
{
int row,col;
char *line, *linePtr;
unsigned char *pixelPtr;
int greenOffset, blueOffset;
greenOffset = blockPtr->offset[1] - blockPtr->offset[0];
blueOffset = blockPtr->offset[2] - blockPtr->offset[0];
if ((blockPtr->width > 0) && (blockPtr->height > 0)) {
line = (char *) ckalloc(8 * blockPtr->width + 2);
for (row=0; row<blockPtr->height; row++) {
pixelPtr = blockPtr->pixelPtr + blockPtr->offset[0] +
row * blockPtr->pitch;
linePtr = line;
for (col=0; col<blockPtr->width; col++) {
sprintf(linePtr, " #%02x%02x%02x", *pixelPtr,
pixelPtr[greenOffset], pixelPtr[blueOffset]);
pixelPtr += blockPtr->pixelSize;
linePtr += 8;
}
Tcl_DStringAppendElement(dataPtr, line+1);
}
ckfree (line);
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tk_PhotoGetImage --
*
* This procedure is called to obtain image data from a photo
* image. This procedure fills in the Tk_PhotoImageBlock structure
* pointed to by `blockPtr' with details of the address and
* layout of the image data in memory.
*
* Results:
* TRUE (1) indicating that image data is available,
* for backwards compatibility with the old photo widget.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
Tk_PhotoGetImage(handle, blockPtr)
Tk_PhotoHandle handle; /* Handle for the photo image from which
* image data is desired. */
Tk_PhotoImageBlock *blockPtr;
/* Information about the address and layout
* of the image data is returned here. */
{
PhotoMaster *masterPtr;
masterPtr = (PhotoMaster *) handle;
blockPtr->pixelPtr = masterPtr->pix24;
blockPtr->width = masterPtr->width;
blockPtr->height = masterPtr->height;
blockPtr->pitch = masterPtr->width * 4;
blockPtr->pixelSize = 4;
blockPtr->offset[0] = 0;
blockPtr->offset[1] = 1;
blockPtr->offset[2] = 2;
return 1;
}
/*
*----------------------------------------------------------------------
*
* PhotoOptionFind --
*
* Finds a specific Photo option.
*
* Results:
* None.
*
* Side effects:
* After commands are removed.
*
*----------------------------------------------------------------------
*/
typedef struct OptionAssocData {
struct OptionAssocData *nextPtr; /* pointer to next OptionAssocData */
Tcl_CmdProc *command; /* command associated with this
* option */
char name[1]; /* name of option (remaining chars) */
} OptionAssocData;
static Tcl_CmdProc *
PhotoOptionFind(interp, name)
Tcl_Interp *interp; /* Interpreter that is being deleted. */
char *name; /* Name of option to be found. */
{
OptionAssocData *list;
char *prevname = NULL;
int length;
Tcl_CmdProc *proc = (Tcl_CmdProc *) NULL;
length = strlen(name);
list = (OptionAssocData *) Tcl_GetAssocData(interp, "photoOption",
(Tcl_InterpDeleteProc **) NULL);
while (list != (OptionAssocData *) NULL) {
if (strncmp(name, list->name, length) == 0) {
if (proc != (Tcl_CmdProc *) NULL) {
Tcl_AppendResult(interp, "ambigeous option \"", name,
"\": must be ", prevname, (char *) NULL);
while (list->nextPtr != (OptionAssocData *) NULL) {
Tcl_AppendResult(interp, prevname, ", ",(char *) NULL);
list = list->nextPtr;
prevname = list->name;
}
Tcl_AppendResult(interp, ", or", prevname, (char *) NULL);
return NULL;
}
proc = list->command;
prevname = list->name;
}
list = list->nextPtr;
}
if (proc == (Tcl_CmdProc *) NULL) {
Tcl_AppendResult(interp, "bad option \"", name,
"\": must be blank, cget, configure, copy, get, put,",
" read, redither, or write", (char *) NULL);
}
return proc;
}
/*
*----------------------------------------------------------------------
*
* PhotoOptionCleanupProc --
*
* This procedure is invoked whenever an interpreter is deleted
* to cleanup the AssocData for "photoVisitor".
*
* Results:
* None.
*
* Side effects:
* Photo Visitor options are removed.
*
*----------------------------------------------------------------------
*/
static void PhotoOptionCleanupProc _ANSI_ARGS_((ClientData clientData,
Tcl_Interp *interp));
static void
PhotoOptionCleanupProc(clientData, interp)
ClientData clientData; /* Points to "photoVisitor" AssocData
* for the interpreter. */
Tcl_Interp *interp; /* Interpreter that is being deleted. */
{
OptionAssocData *list = (OptionAssocData *) clientData;
OptionAssocData *ptr;
while (list != NULL) {
list = (ptr = list)->nextPtr;
ckfree((char *) ptr);
}
}
/*
*--------------------------------------------------------------
*
* Tk_CreatePhotoOption --
*
* This procedure may be invoked to add a new kind of photo
* option to the core photo command supported by Tk.
*
* Results:
* None.
*
* Side effects:
* From now on, the new option will be useable by the
* photo command.
*
*--------------------------------------------------------------
*/
void
Tk_CreatePhotoOption(interp, name, proc)
Tcl_Interp *interp; /* interpreter */
CONST char *name; /* option name */
Tcl_CmdProc *proc; /* proc to execute command */
{
OptionAssocData *typePtr2, *prevPtr, *ptr;
OptionAssocData *list;
list = (OptionAssocData *) Tcl_GetAssocData(interp, "photoOption",
(Tcl_InterpDeleteProc **) NULL);
/*
* If there's already a photo option with the given name, remove it.
*/
for (typePtr2 = list, prevPtr = NULL; typePtr2 != NULL;
prevPtr = typePtr2, typePtr2 = typePtr2->nextPtr) {
if (strcmp(typePtr2->name, name) == 0) {
if (prevPtr == NULL) {
list = typePtr2->nextPtr;
} else {
prevPtr->nextPtr = typePtr2->nextPtr;
}
ckfree((char *) typePtr2);
break;
}
}
ptr = (OptionAssocData *) ckalloc(sizeof(OptionAssocData) + strlen(name));
strcpy(&(ptr->name[0]), name);
ptr->command = proc;
ptr->nextPtr = list;
Tcl_SetAssocData(interp, "photoOption", PhotoOptionCleanupProc,
(ClientData) ptr);
}