#include "imager.h"
#include "imageri.h"
/*
=head1 NAME
fills.c - implements the basic general fills
=head1 SYNOPSIS
i_fill_t *fill;
i_color c1, c2;
i_fcolor fc1, fc2;
int combine;
fill = i_new_fill_solidf(&fc1, combine);
fill = i_new_fill_solid(&c1, combine);
fill = i_new_fill_hatchf(&fc1, &fc2, combine, hatch, cust_hash, dx, dy);
fill = i_new_fill_hatch(&c1, &c2, combine, hatch, cust_hash, dx, dy);
fill = i_new_fill_image(im, matrix, xoff, yoff, combine);
fill = i_new_fill_opacity(fill, alpha_mult);
i_fill_destroy(fill);
=head1 DESCRIPTION
Implements the basic general fills, which can be used for filling some
shapes and for flood fills.
Each fill can implement up to 3 functions:
=over
=item fill_with_color
called for fills on 8-bit images. This can be NULL in which case the
fill_with_colorf function is called.
=item fill_with_fcolor
called for fills on non-8-bit images or when fill_with_color is NULL.
=item destroy
called by i_fill_destroy() if non-NULL, to release any extra resources
that the fill may need.
=back
fill_with_color and fill_with_fcolor are basically the same function
except that the first works with lines of i_color and the second with
lines of i_fcolor.
If the combines member if non-zero the line data is populated from the
target image before calling fill_with_*color.
fill_with_color needs to fill the I<data> parameter with the fill
pixels. If combines is non-zero it the fill pixels should be combined
with the existing data.
The current fills are:
=over
=item *
solid fill
=item *
hatched fill
=item *
fountain fill
=back
Fountain fill is implemented by L<filters.c>.
Other fills that could be implemented include:
=over
=item *
image - an image tiled over the fill area, with an offset either
horizontally or vertically.
=item *
checkerboard - combine 2 fills in a checkerboard
=item *
combine - combine the levels of 2 other fills based in the levels of
an image
=item *
regmach - use the register machine to generate colors
=back
=over
=cut
*/
static i_color fcolor_to_color(const i_fcolor *c) {
int ch;
i_color out;
for (ch = 0; ch < MAXCHANNELS; ++ch)
out.channel[ch] = SampleFTo8(c->channel[ch]);
return out;
}
static i_fcolor color_to_fcolor(const i_color *c) {
int ch;
i_fcolor out;
for (ch = 0; ch < MAXCHANNELS; ++ch)
out.channel[ch] = Sample8ToF(c->channel[ch]);
return out;
}
/* alpha combine in with out */
#define COMBINE(out, in, channels) \
{ \
int ch; \
for (ch = 0; ch < (channels); ++ch) { \
(out).channel[ch] = ((out).channel[ch] * (255 - (in).channel[3]) \
+ (in).channel[ch] * (in).channel[3]) / 255; \
} \
}
/* alpha combine in with out, in this case in is a simple array of
samples, potentially not integers - the mult combiner uses doubles
for accuracy */
#define COMBINEA(out, in, channels) \
{ \
int ch; \
for (ch = 0; ch < (channels); ++ch) { \
(out).channel[ch] = ((out).channel[ch] * (255 - (in)[3]) \
+ (in)[ch] * (in)[3]) / 255; \
} \
}
#define COMBINEF(out, in, channels) \
{ \
int ch; \
for (ch = 0; ch < (channels); ++ch) { \
(out).channel[ch] = (out).channel[ch] * (1.0 - (in).channel[3]) \
+ (in).channel[ch] * (in).channel[3]; \
} \
}
typedef struct
{
i_fill_t base;
i_color c;
i_fcolor fc;
} i_fill_solid_t;
static void fill_solid(i_fill_t *, i_img_dim x, i_img_dim y, i_img_dim width,
int channels, i_color *);
static void fill_solidf(i_fill_t *, i_img_dim x, i_img_dim y, i_img_dim width,
int channels, i_fcolor *);
static i_fill_solid_t base_solid_fill =
{
{
fill_solid,
fill_solidf,
NULL,
NULL,
NULL,
},
};
/*
=item i_fill_destroy(fill)
=order 90
=category Fills
=synopsis i_fill_destroy(fill);
Call to destroy any fill object.
=cut
*/
void
i_fill_destroy(i_fill_t *fill) {
if (fill->destroy)
(fill->destroy)(fill);
myfree(fill);
}
/*
=item i_new_fill_solidf(color, combine)
=category Fills
=synopsis i_fill_t *fill = i_new_fill_solidf(&fcolor, combine);
Create a solid fill based on a float color.
If combine is non-zero then alpha values will be combined.
=cut
*/
i_fill_t *
i_new_fill_solidf(const i_fcolor *c, int combine) {
int ch;
i_fill_solid_t *fill = mymalloc(sizeof(i_fill_solid_t)); /* checked 14jul05 tonyc */
*fill = base_solid_fill;
if (combine) {
i_get_combine(combine, &fill->base.combine, &fill->base.combinef);
}
fill->fc = *c;
for (ch = 0; ch < MAXCHANNELS; ++ch) {
fill->c.channel[ch] = SampleFTo8(c->channel[ch]);
}
return &fill->base;
}
/*
=item i_new_fill_solid(color, combine)
=category Fills
=synopsis i_fill_t *fill = i_new_fill_solid(&color, combine);
Create a solid fill based on an 8-bit color.
If combine is non-zero then alpha values will be combined.
=cut
*/
i_fill_t *
i_new_fill_solid(const i_color *c, int combine) {
int ch;
i_fill_solid_t *fill = mymalloc(sizeof(i_fill_solid_t)); /* checked 14jul05 tonyc */
*fill = base_solid_fill;
if (combine) {
i_get_combine(combine, &fill->base.combine, &fill->base.combinef);
}
fill->c = *c;
for (ch = 0; ch < MAXCHANNELS; ++ch) {
fill->fc.channel[ch] = Sample8ToF(c->channel[ch]);
}
return &fill->base;
}
static unsigned char
builtin_hatches[][8] =
{
{
/* 1x1 checkerboard */
0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55,
},
{
/* 2x2 checkerboard */
0xCC, 0xCC, 0x33, 0x33, 0xCC, 0xCC, 0x33, 0x33,
},
{
/* 4 x 4 checkerboard */
0xF0, 0xF0, 0xF0, 0xF0, 0x0F, 0x0F, 0x0F, 0x0F,
},
{
/* single vertical lines */
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
},
{
/* double vertical lines */
0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11,
},
{
/* quad vertical lines */
0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55,
},
{
/* single hlines */
0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
},
{
/* double hlines */
0xFF, 0x00, 0x00, 0x00, 0xFF, 0x00, 0x00, 0x00,
},
{
/* quad hlines */
0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00,
},
{
/* single / */
0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80,
},
{
/* single \ */
0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01,
},
{
/* double / */
0x11, 0x22, 0x44, 0x88, 0x11, 0x22, 0x44, 0x88,
},
{
/* double \ */
0x88, 0x44, 0x22, 0x11, 0x88, 0x44, 0x22, 0x11,
},
{
/* single grid */
0xFF, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
},
{
/* double grid */
0xFF, 0x88, 0x88, 0x88, 0xFF, 0x88, 0x88, 0x88,
},
{
/* quad grid */
0xFF, 0xAA, 0xFF, 0xAA, 0xFF, 0xAA, 0xFF, 0xAA,
},
{
/* single dots */
0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
},
{
/* 4 dots */
0x88, 0x00, 0x00, 0x00, 0x88, 0x00, 0x00, 0x00,
},
{
/* 16 dots */
0xAA, 0x00, 0xAA, 0x00, 0xAA, 0x00, 0xAA, 0x00,
},
{
/* simple stipple */
0x48, 0x84, 0x00, 0x00, 0x84, 0x48, 0x00, 0x00,
},
{
/* weave */
0x55, 0xFD, 0x05, 0xFD, 0x55, 0xDF, 0x50, 0xDF,
},
{
/* single cross hatch */
0x82, 0x44, 0x28, 0x10, 0x28, 0x44, 0x82, 0x01,
},
{
/* double cross hatch */
0xAA, 0x44, 0xAA, 0x11, 0xAA, 0x44, 0xAA, 0x11,
},
{
/* vertical lozenge */
0x11, 0x11, 0x11, 0xAA, 0x44, 0x44, 0x44, 0xAA,
},
{
/* horizontal lozenge */
0x88, 0x70, 0x88, 0x07, 0x88, 0x70, 0x88, 0x07,
},
{
/* scales overlapping downwards */
0x80, 0x80, 0x41, 0x3E, 0x08, 0x08, 0x14, 0xE3,
},
{
/* scales overlapping upwards */
0xC7, 0x28, 0x10, 0x10, 0x7C, 0x82, 0x01, 0x01,
},
{
/* scales overlapping leftwards */
0x83, 0x84, 0x88, 0x48, 0x38, 0x48, 0x88, 0x84,
},
{
/* scales overlapping rightwards */
0x21, 0x11, 0x12, 0x1C, 0x12, 0x11, 0x21, 0xC1,
},
{
/* denser stipple */
0x44, 0x88, 0x22, 0x11, 0x44, 0x88, 0x22, 0x11,
},
{
/* L-shaped tiles */
0xFF, 0x84, 0x84, 0x9C, 0x94, 0x9C, 0x90, 0x90,
},
{
/* wider stipple */
0x80, 0x40, 0x20, 0x00, 0x02, 0x04, 0x08, 0x00,
},
};
typedef struct
{
i_fill_t base;
i_color fg, bg;
i_fcolor ffg, fbg;
unsigned char hatch[8];
i_img_dim dx, dy;
} i_fill_hatch_t;
static void fill_hatch(i_fill_t *fill, i_img_dim x, i_img_dim y,
i_img_dim width, int channels, i_color *data);
static void fill_hatchf(i_fill_t *fill, i_img_dim x, i_img_dim y,
i_img_dim width, int channels, i_fcolor *data);
static
i_fill_t *
i_new_hatch_low(const i_color *fg, const i_color *bg, const i_fcolor *ffg, const i_fcolor *fbg,
int combine, int hatch, const unsigned char *cust_hatch,
i_img_dim dx, i_img_dim dy);
/*
=item i_new_fill_hatch(C<fg>, C<bg>, C<combine>, C<hatch>, C<cust_hatch>, C<dx>, C<dy>)
=category Fills
=synopsis i_fill_t *fill = i_new_fill_hatch(&fg_color, &bg_color, combine, hatch, custom_hatch, dx, dy);
Creates a new hatched fill with the C<fg> color used for the 1 bits in
the hatch and C<bg> for the 0 bits. If C<combine> is non-zero alpha
values will be combined.
If C<cust_hatch> is non-NULL it should be a pointer to 8 bytes of the
hash definition, with the high-bits to the left.
If C<cust_hatch> is NULL then one of the standard hatches is used.
(C<dx>, C<dy>) are an offset into the hatch which can be used to hatch
adjoining areas out of alignment, or to align the origin of a hatch
with the the side of a filled area.
=cut
*/
i_fill_t *
i_new_fill_hatch(const i_color *fg, const i_color *bg, int combine, int hatch,
const unsigned char *cust_hatch, i_img_dim dx, i_img_dim dy) {
return i_new_hatch_low(fg, bg, NULL, NULL, combine, hatch, cust_hatch,
dx, dy);
}
/*
=item i_new_fill_hatchf(C<fg>, C<bg>, C<combine>, C<hatch>, C<cust_hatch>, C<dx>, C<dy>)
=category Fills
=synopsis i_fill_t *fill = i_new_fill_hatchf(&fg_fcolor, &bg_fcolor, combine, hatch, custom_hatch, dx, dy);
Creates a new hatched fill with the C<fg> color used for the 1 bits in
the hatch and C<bg> for the 0 bits. If C<combine> is non-zero alpha
values will be combined.
If C<cust_hatch> is non-NULL it should be a pointer to 8 bytes of the
hash definition, with the high-bits to the left.
If C<cust_hatch> is NULL then one of the standard hatches is used.
(C<dx>, C<dy>) are an offset into the hatch which can be used to hatch
adjoining areas out of alignment, or to align the origin of a hatch
with the the side of a filled area.
=cut
*/
i_fill_t *
i_new_fill_hatchf(const i_fcolor *fg, const i_fcolor *bg, int combine, int hatch,
const unsigned char *cust_hatch, i_img_dim dx, i_img_dim dy) {
return i_new_hatch_low(NULL, NULL, fg, bg, combine, hatch, cust_hatch,
dx, dy);
}
static void fill_image(i_fill_t *fill, i_img_dim x, i_img_dim y,
i_img_dim width, int channels, i_color *data);
static void fill_imagef(i_fill_t *fill, i_img_dim x, i_img_dim y,
i_img_dim width, int channels, i_fcolor *data);
struct i_fill_image_t {
i_fill_t base;
i_img *src;
i_img_dim xoff, yoff;
int has_matrix;
double matrix[9];
};
static struct i_fill_image_t
image_fill_proto =
{
{
fill_image,
fill_imagef,
NULL
}
};
/*
=item i_new_fill_image(C<im>, C<matrix>, C<xoff>, C<yoff>, C<combine>)
=category Fills
=synopsis i_fill_t *fill = i_new_fill_image(src_img, matrix, x_offset, y_offset, combine);
Create an image based fill.
matrix is an array of 9 doubles representing a transformation matrix.
C<xoff> and C<yoff> are the offset into the image to start filling from.
=cut
*/
i_fill_t *
i_new_fill_image(i_img *im, const double *matrix, i_img_dim xoff, i_img_dim yoff, int combine) {
struct i_fill_image_t *fill = mymalloc(sizeof(*fill)); /* checked 14jul05 tonyc */
*fill = image_fill_proto;
if (combine) {
i_get_combine(combine, &fill->base.combine, &fill->base.combinef);
}
else {
fill->base.combine = NULL;
fill->base.combinef = NULL;
}
fill->src = im;
if (xoff < 0)
xoff += im->xsize;
fill->xoff = xoff;
if (yoff < 0)
yoff += im->ysize;
fill->yoff = yoff;
if (matrix) {
fill->has_matrix = 1;
memcpy(fill->matrix, matrix, sizeof(fill->matrix));
}
else
fill->has_matrix = 0;
return &fill->base;
}
static void fill_opacity(i_fill_t *fill, i_img_dim x, i_img_dim y,
i_img_dim width, int channels, i_color *data);
static void fill_opacityf(i_fill_t *fill, i_img_dim x, i_img_dim y,
i_img_dim width, int channels, i_fcolor *data);
struct i_fill_opacity_t {
i_fill_t base;
i_fill_t *other_fill;
double alpha_mult;
};
static struct i_fill_opacity_t
opacity_fill_proto =
{
{
fill_opacity,
fill_opacityf,
NULL
}
};
i_fill_t *
i_new_fill_opacity(i_fill_t *base_fill, double alpha_mult) {
struct i_fill_opacity_t *fill = mymalloc(sizeof(*fill));
*fill = opacity_fill_proto;
fill->base.combine = base_fill->combine;
fill->base.combinef = base_fill->combinef;
fill->other_fill = base_fill;
fill->alpha_mult = alpha_mult;
if (!base_fill->f_fill_with_color) {
/* base fill only does floating, so we only do that too */
fill->base.f_fill_with_color = NULL;
}
return &fill->base;
}
#define T_SOLID_FILL(fill) ((i_fill_solid_t *)(fill))
/*
=back
=head1 INTERNAL FUNCTIONS
=over
=item fill_solid(fill, x, y, width, channels, data)
The 8-bit sample fill function for non-combining solid fills.
=cut
*/
static void
fill_solid(i_fill_t *fill, i_img_dim x, i_img_dim y, i_img_dim width,
int channels, i_color *data) {
i_color c = T_SOLID_FILL(fill)->c;
i_adapt_colors(channels > 2 ? 4 : 2, 4, &c, 1);
while (width-- > 0) {
*data++ = c;
}
}
/*
=item fill_solid(fill, x, y, width, channels, data)
The floating sample fill function for non-combining solid fills.
=cut
*/
static void
fill_solidf(i_fill_t *fill, i_img_dim x, i_img_dim y, i_img_dim width,
int channels, i_fcolor *data) {
i_fcolor c = T_SOLID_FILL(fill)->fc;
i_adapt_fcolors(channels > 2 ? 4 : 2, 4, &c, 1);
while (width-- > 0) {
*data++ = c;
}
}
static i_fill_hatch_t
hatch_fill_proto =
{
{
fill_hatch,
fill_hatchf,
NULL
}
};
/*
=item i_new_hatch_low(fg, bg, ffg, fbg, combine, hatch, cust_hatch, dx, dy)
Implements creation of hatch fill objects.
=cut
*/
static
i_fill_t *
i_new_hatch_low(const i_color *fg, const i_color *bg,
const i_fcolor *ffg, const i_fcolor *fbg,
int combine, int hatch, const unsigned char *cust_hatch,
i_img_dim dx, i_img_dim dy) {
i_fill_hatch_t *fill = mymalloc(sizeof(i_fill_hatch_t)); /* checked 14jul05 tonyc */
*fill = hatch_fill_proto;
/* Some Sun C didn't like the condition expressions that were here.
See https://rt.cpan.org/Ticket/Display.html?id=21944
*/
if (fg)
fill->fg = *fg;
else
fill->fg = fcolor_to_color(ffg);
if (bg)
fill->bg = *bg;
else
fill->bg = fcolor_to_color(fbg);
if (ffg)
fill->ffg = *ffg;
else
fill->ffg = color_to_fcolor(fg);
if (fbg)
fill->fbg = *fbg;
else
fill->fbg = color_to_fcolor(bg);
if (combine) {
i_get_combine(combine, &fill->base.combine, &fill->base.combinef);
}
else {
fill->base.combine = NULL;
fill->base.combinef = NULL;
}
if (cust_hatch) {
memcpy(fill->hatch, cust_hatch, 8);
}
else {
if (hatch > sizeof(builtin_hatches)/sizeof(*builtin_hatches))
hatch = 0;
memcpy(fill->hatch, builtin_hatches[hatch], 8);
}
fill->dx = dx & 7;
fill->dy = dy & 7;
return &fill->base;
}
/*
=item fill_hatch(fill, x, y, width, channels, data)
The 8-bit sample fill function for hatched fills.
=cut
*/
static void
fill_hatch(i_fill_t *fill, i_img_dim x, i_img_dim y, i_img_dim width,
int channels, i_color *data) {
i_fill_hatch_t *f = (i_fill_hatch_t *)fill;
int byte = f->hatch[(y + f->dy) & 7];
int xpos = (x + f->dx) & 7;
int mask = 128 >> xpos;
i_color fg = f->fg;
i_color bg = f->bg;
if (channels < 3) {
i_adapt_colors(2, 4, &fg, 1);
i_adapt_colors(2, 4, &bg, 1);
}
while (width-- > 0) {
if (byte & mask)
*data++ = fg;
else
*data++ = bg;
if ((mask >>= 1) == 0)
mask = 128;
}
}
/*
=item fill_hatchf(fill, x, y, width, channels, data)
The floating sample fill function for hatched fills.
=back
*/
static void
fill_hatchf(i_fill_t *fill, i_img_dim x, i_img_dim y, i_img_dim width,
int channels, i_fcolor *data) {
i_fill_hatch_t *f = (i_fill_hatch_t *)fill;
int byte = f->hatch[(y + f->dy) & 7];
int xpos = (x + f->dx) & 7;
int mask = 128 >> xpos;
i_fcolor fg = f->ffg;
i_fcolor bg = f->fbg;
if (channels < 3) {
i_adapt_fcolors(2, 4, &fg, 1);
i_adapt_fcolors(2, 4, &bg, 1);
}
while (width-- > 0) {
if (byte & mask)
*data++ = fg;
else
*data++ = bg;
if ((mask >>= 1) == 0)
mask = 128;
}
}
/* hopefully this will be inlined (it is with -O3 with gcc 2.95.4) */
/* linear interpolation */
static i_color interp_i_color(i_color before, i_color after, double pos,
int channels) {
i_color out;
int ch;
pos -= floor(pos);
for (ch = 0; ch < channels; ++ch)
out.channel[ch] = (1-pos) * before.channel[ch] + pos * after.channel[ch];
if (channels > 3 && out.channel[3])
for (ch = 0; ch < channels; ++ch)
if (ch != 3) {
int temp = out.channel[ch] * 255 / out.channel[3];
if (temp > 255)
temp = 255;
out.channel[ch] = temp;
}
return out;
}
/* hopefully this will be inlined (it is with -O3 with gcc 2.95.4) */
/* linear interpolation */
static i_fcolor interp_i_fcolor(i_fcolor before, i_fcolor after, double pos,
int channels) {
i_fcolor out;
int ch;
pos -= floor(pos);
for (ch = 0; ch < channels; ++ch)
out.channel[ch] = (1-pos) * before.channel[ch] + pos * after.channel[ch];
if (out.channel[3])
for (ch = 0; ch < channels; ++ch)
if (ch != 3) {
int temp = out.channel[ch] / out.channel[3];
if (temp > 1.0)
temp = 1.0;
out.channel[ch] = temp;
}
return out;
}
/*
=item fill_image(fill, x, y, width, channels, data, work)
=cut
*/
static void
fill_image(i_fill_t *fill, i_img_dim x, i_img_dim y, i_img_dim width,
int channels, i_color *data) {
struct i_fill_image_t *f = (struct i_fill_image_t *)fill;
i_img_dim i = 0;
i_color *out = data;
int want_channels = channels > 2 ? 4 : 2;
if (f->has_matrix) {
/* the hard way */
while (i < width) {
double rx = f->matrix[0] * (x+i) + f->matrix[1] * y + f->matrix[2];
double ry = f->matrix[3] * (x+i) + f->matrix[4] * y + f->matrix[5];
double ix = floor(rx / f->src->xsize);
double iy = floor(ry / f->src->ysize);
i_color c[2][2];
i_color c2[2];
i_img_dim dy;
if (f->xoff) {
rx += iy * f->xoff;
ix = floor(rx / f->src->xsize);
}
else if (f->yoff) {
ry += ix * f->yoff;
iy = floor(ry / f->src->ysize);
}
rx -= ix * f->src->xsize;
ry -= iy * f->src->ysize;
for (dy = 0; dy < 2; ++dy) {
if ((i_img_dim)rx == f->src->xsize-1) {
i_gpix(f->src, f->src->xsize-1, ((i_img_dim)ry+dy) % f->src->ysize, &c[dy][0]);
i_gpix(f->src, 0, ((i_img_dim)ry+dy) % f->src->xsize, &c[dy][1]);
}
else {
i_glin(f->src, (i_img_dim)rx, (i_img_dim)rx+2, ((i_img_dim)ry+dy) % f->src->ysize,
c[dy]);
}
c2[dy] = interp_i_color(c[dy][0], c[dy][1], rx, f->src->channels);
}
*out++ = interp_i_color(c2[0], c2[1], ry, f->src->channels);
++i;
}
}
else {
/* the easy way */
/* this should be possible to optimize to use i_glin() */
while (i < width) {
i_img_dim rx = x+i;
i_img_dim ry = y;
i_img_dim ix = rx / f->src->xsize;
i_img_dim iy = ry / f->src->ysize;
if (f->xoff) {
rx += iy * f->xoff;
ix = rx / f->src->xsize;
}
else if (f->yoff) {
ry += ix * f->yoff;
iy = ry / f->src->xsize;
}
rx -= ix * f->src->xsize;
ry -= iy * f->src->ysize;
i_gpix(f->src, rx, ry, out);
++out;
++i;
}
}
if (f->src->channels != want_channels)
i_adapt_colors(want_channels, f->src->channels, data, width);
}
/*
=item fill_imagef(fill, x, y, width, channels, data, work)
=cut
*/
static void
fill_imagef(i_fill_t *fill, i_img_dim x, i_img_dim y, i_img_dim width,
int channels, i_fcolor *data) {
struct i_fill_image_t *f = (struct i_fill_image_t *)fill;
i_img_dim i = 0;
int want_channels = channels > 2 ? 4 : 2;
if (f->has_matrix) {
i_fcolor *work_data = data;
/* the hard way */
while (i < width) {
double rx = f->matrix[0] * (x+i) + f->matrix[1] * y + f->matrix[2];
double ry = f->matrix[3] * (x+i) + f->matrix[4] * y + f->matrix[5];
double ix = floor(rx / f->src->xsize);
double iy = floor(ry / f->src->ysize);
i_fcolor c[2][2];
i_fcolor c2[2];
i_img_dim dy;
if (f->xoff) {
rx += iy * f->xoff;
ix = floor(rx / f->src->xsize);
}
else if (f->yoff) {
ry += ix * f->yoff;
iy = floor(ry / f->src->ysize);
}
rx -= ix * f->src->xsize;
ry -= iy * f->src->ysize;
for (dy = 0; dy < 2; ++dy) {
if ((i_img_dim)rx == f->src->xsize-1) {
i_gpixf(f->src, f->src->xsize-1, ((i_img_dim)ry+dy) % f->src->ysize, &c[dy][0]);
i_gpixf(f->src, 0, ((i_img_dim)ry+dy) % f->src->xsize, &c[dy][1]);
}
else {
i_glinf(f->src, (i_img_dim)rx, (i_img_dim)rx+2, ((i_img_dim)ry+dy) % f->src->ysize,
c[dy]);
}
c2[dy] = interp_i_fcolor(c[dy][0], c[dy][1], rx, f->src->channels);
}
*work_data++ = interp_i_fcolor(c2[0], c2[1], ry, f->src->channels);
++i;
}
}
else {
i_fcolor *work_data = data;
/* the easy way */
/* this should be possible to optimize to use i_glin() */
while (i < width) {
i_img_dim rx = x+i;
i_img_dim ry = y;
i_img_dim ix = rx / f->src->xsize;
i_img_dim iy = ry / f->src->ysize;
if (f->xoff) {
rx += iy * f->xoff;
ix = rx / f->src->xsize;
}
else if (f->yoff) {
ry += ix * f->yoff;
iy = ry / f->src->xsize;
}
rx -= ix * f->src->xsize;
ry -= iy * f->src->ysize;
i_gpixf(f->src, rx, ry, work_data);
++work_data;
++i;
}
}
if (f->src->channels != want_channels)
i_adapt_fcolors(want_channels, f->src->channels, data, width);
}
static void
fill_opacity(i_fill_t *fill, i_img_dim x, i_img_dim y, i_img_dim width,
int channels, i_color *data) {
struct i_fill_opacity_t *f = (struct i_fill_opacity_t *)fill;
int alpha_chan = channels > 2 ? 3 : 1;
i_color *datap = data;
(f->other_fill->f_fill_with_color)(f->other_fill, x, y, width, channels, data);
while (width--) {
double new_alpha = datap->channel[alpha_chan] * f->alpha_mult;
if (new_alpha < 0)
datap->channel[alpha_chan] = 0;
else if (new_alpha > 255)
datap->channel[alpha_chan] = 255;
else datap->channel[alpha_chan] = (int)(new_alpha + 0.5);
++datap;
}
}
static void
fill_opacityf(i_fill_t *fill, i_img_dim x, i_img_dim y, i_img_dim width,
int channels, i_fcolor *data) {
struct i_fill_opacity_t *f = (struct i_fill_opacity_t *)fill;
int alpha_chan = channels > 2 ? 3 : 1;
i_fcolor *datap = data;
(f->other_fill->f_fill_with_fcolor)(f->other_fill, x, y, width, channels, data);
while (width--) {
double new_alpha = datap->channel[alpha_chan] * f->alpha_mult;
if (new_alpha < 0)
datap->channel[alpha_chan] = 0;
else if (new_alpha > 1.0)
datap->channel[alpha_chan] = 1.0;
else datap->channel[alpha_chan] = new_alpha;
++datap;
}
}
/*
=back
=head1 AUTHOR
Tony Cook <tony@develop-help.com>
=head1 SEE ALSO
Imager(3)
=cut
*/