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#define IMAGER_NO_CONTEXT
#include "imager.h"
#include "imageri.h"
IMAGER_STATIC_INLINE int
match_one_color(const i_sample_t *testme, const i_trim_colors_t *test) {
if (test->c1.channel[0] > testme[0] || test->c2.channel[0] < testme[0])
return 0;
if (test->c1.channel[1] > testme[1] || test->c2.channel[1] < testme[1])
return 0;
if (test->c1.channel[2] > testme[2] || test->c2.channel[2] < testme[2])
return 0;
return 1;
}
IMAGER_STATIC_INLINE int
match_one_fcolor(const i_fsample_t *testme, const i_trim_colors_t *test) {
if (test->cf1.channel[0] > testme[0] || test->cf2.channel[0] < testme[0])
return 0;
if (test->cf1.channel[1] > testme[1] || test->cf2.channel[1] < testme[1])
return 0;
if (test->cf1.channel[2] > testme[2] || test->cf2.channel[2] < testme[2])
return 0;
return 1;
}
IMAGER_STATIC_INLINE int
match_any_color(const i_sample_t *testme, const i_trim_colors_t *tests, int count) {
int i;
for (i = 0; i < count; ++i) {
if (match_one_color(testme, tests+i))
return 1;
}
return 0;
}
IMAGER_STATIC_INLINE int
match_any_fcolor(const i_fsample_t *testme, const i_trim_colors_t *tests, int count) {
int i;
for (i = 0; i < count; ++i) {
if (match_one_fcolor(testme, tests+i))
return 1;
}
return 0;
}
#!define MATCH_ANY_COLOR match_any_color match_any_fcolor
static const int gray_chans[4] = { 0, 0, 0, 1 };
#define TEST_COLOR(s) \
(color_count && MATCH_ANY_COLOR((s), colors, color_count) || \
check_alpha && (s)[3] <= work_threshold)
static int
trim_rect_simple(i_img *im, double transp_threshold, int color_count,
const i_trim_colors_t *colors, i_img_dim *left, i_img_dim *top,
i_img_dim *right, i_img_dim *bottom) {
const int color_chans = i_img_color_channels(im);
const int *chans = color_chans == 1 ? gray_chans : NULL;
const int has_alpha = i_img_has_alpha(im);
const int check_alpha = has_alpha && transp_threshold < 1.0;
const int chan_count = check_alpha ? 4 : 3;
i_img_dim x, y;
#code im->bits <= 8
IM_SAMPLE_T *samps = mymalloc(sizeof(IM_SAMPLE_T) * im->xsize * chan_count);
#if IM_EIGHT_BIT
const IM_WORK_T work_threshold = floor(IM_SAMPLE_MAX * transp_threshold);
#else
const IM_WORK_T work_threshold = transp_threshold;
#endif
/* scan down from top */
for (y = 0; y < im->ysize; ++y) {
IM_SAMPLE_T *s;
IM_GSAMP(im, 0, im->xsize, y, samps, chans, chan_count);
for (x = 0, s = samps; x < im->xsize; ++x, s += chan_count) {
if (!TEST_COLOR(s))
break;
}
if (x < im->xsize)
break;
}
*top = y;
if (y < im->ysize) {
/* scan from the bottom */
for (y = im->ysize-1; y >= 0; --y) {
IM_SAMPLE_T *s;
IM_GSAMP(im, 0, im->xsize, y, samps, chans, chan_count);
for (x = 0, s = samps; x < im->xsize; ++x, s += chan_count) {
if (!TEST_COLOR(s))
break;
}
if (x < im->xsize)
break;
}
*bottom = im->ysize - y - 1;
/* we've trimmed top and bottom, now the sides */
*left = *right = im->xsize;
for (y = *top; y < im->ysize - *bottom && (*left || *right); ++y) {
IM_SAMPLE_T *s;
IM_GSAMP(im, 0, im->xsize, y, samps, chans, chan_count);
for (x = 0, s = samps; x < *left; ++x, s += chan_count) {
if (!TEST_COLOR(s)) {
*left = x;
break;
}
}
for (x = im->xsize - 1, s = samps + chan_count * im->xsize;
x >= im->xsize - *right; --x, s -= chan_count) {
if (!TEST_COLOR(s-chan_count)) {
*right = im->xsize - x - 1;
break;
}
}
}
}
else {
/* whole image can be trimmed */
*left = im->xsize;
*right = *bottom = 0;
}
myfree(samps);
#/code
return 1;
}
int
i_trim_rect(i_img *im, double transp_threshold, int color_count, const i_trim_colors_t *colors,
i_img_dim *left, i_img_dim *top, i_img_dim *right, i_img_dim *bottom) {
dIMCTXim(im);
i_trim_colors_t *tcolors = NULL;
i_trim_colors_t *tcolorp;
const i_trim_colors_t *colorp;
int tcolor_count = 0;
int result;
if (color_count) {
tcolors = mymalloc(sizeof(i_trim_colors_t) * color_count);
tcolorp = tcolors;
/* convert 8-bit to float colors, or float colors to 8-bit depending on the
image type.
*/
if (im->bits <= 8) {
int i, ch;
for (i = 0, colorp = colors; i < color_count; ++i, ++colorp) {
if (colorp->is_float) {
for (ch = 0; ch < 3; ++ch) {
tcolorp->c1.channel[ch] = ceil(colorp->cf1.channel[ch] * 255);
tcolorp->c2.channel[ch] = floor(colorp->cf2.channel[ch] * 255);
}
}
else {
*tcolorp = *colorp;
}
for (ch = 0; ch < 3; ++ch) {
if (tcolorp->c1.channel[ch] > tcolorp->c2.channel[ch])
break;
}
if (ch == 3) {
++tcolorp, ++tcolor_count;
}
}
/* TODO optimize where the image is greyscale to remove color ranges that don't
overlap the greyscale line
*/
}
else {
int i, ch;
for (i = 0, colorp = colors; i < color_count; ++i, ++colorp) {
if (!colorp->is_float) {
for (ch = 0; ch < 3; ++ch) {
tcolorp->cf1.channel[ch] = colorp->c1.channel[ch] / 255.0;
tcolorp->cf2.channel[ch] = colorp->c2.channel[ch] / 255.0;
}
}
else {
*tcolorp = *colors;
}
for (ch = 0; ch < 3; ++ch) {
if (tcolorp->cf1.channel[ch] > tcolorp->cf2.channel[ch])
break;
}
if (ch == 3) {
++tcolorp, ++tcolor_count;
}
}
/* TODO optimize where the image is greyscale to remove color ranges that don't
overlap the greyscale line
*/
}
}
i_clear_error();
if (transp_threshold > 1.0 && tcolor_count == 0) {
/* nothing to do */
*left = *top = *right = *bottom = 0;
result = 1;
}
else {
result = trim_rect_simple(im, transp_threshold, tcolor_count, tcolors, left, top,
right, bottom);
}
myfree(tcolors);
return result;
}
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