mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-26 19:51:11 +00:00
111 lines
3.2 KiB
C
111 lines
3.2 KiB
C
|
|
#include "libimagequant.h"
|
|
#include "pam.h"
|
|
#include "viter.h"
|
|
#include "nearest.h"
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#ifdef _OPENMP
|
|
#include <omp.h>
|
|
#else
|
|
#define omp_get_max_threads() 1
|
|
#define omp_get_thread_num() 0
|
|
#endif
|
|
|
|
/*
|
|
* Voronoi iteration: new palette color is computed from weighted average of colors that map to that palette entry.
|
|
*/
|
|
LIQ_PRIVATE void
|
|
viter_init (const colormap * map, const unsigned int max_threads,
|
|
viter_state average_color[])
|
|
{
|
|
memset (average_color, 0,
|
|
sizeof (average_color[0]) * (VITER_CACHE_LINE_GAP +
|
|
map->colors) * max_threads);
|
|
}
|
|
|
|
LIQ_PRIVATE void
|
|
viter_update_color (const f_pixel acolor, const float value,
|
|
const colormap * map, unsigned int match, const unsigned int thread,
|
|
viter_state average_color[])
|
|
{
|
|
match += thread * (VITER_CACHE_LINE_GAP + map->colors);
|
|
average_color[match].a += acolor.a * value;
|
|
average_color[match].r += acolor.r * value;
|
|
average_color[match].g += acolor.g * value;
|
|
average_color[match].b += acolor.b * value;
|
|
average_color[match].total += value;
|
|
}
|
|
|
|
LIQ_PRIVATE void
|
|
viter_finalize (colormap * map, const unsigned int max_threads,
|
|
const viter_state average_color[])
|
|
{
|
|
for (unsigned int i = 0; i < map->colors; i++) {
|
|
double a = 0, r = 0, g = 0, b = 0, total = 0;
|
|
|
|
// Aggregate results from all threads
|
|
for (unsigned int t = 0; t < max_threads; t++) {
|
|
const unsigned int offset = (VITER_CACHE_LINE_GAP + map->colors) * t + i;
|
|
|
|
a += average_color[offset].a;
|
|
r += average_color[offset].r;
|
|
g += average_color[offset].g;
|
|
b += average_color[offset].b;
|
|
total += average_color[offset].total;
|
|
}
|
|
|
|
if (total && !map->palette[i].fixed) {
|
|
map->palette[i].acolor = (f_pixel) {
|
|
.a = a / total,.r = r / total,.g = g / total,.b = b / total,};
|
|
} else {
|
|
total = i / 1024.0;
|
|
}
|
|
map->palette[i].popularity = total;
|
|
}
|
|
}
|
|
|
|
LIQ_PRIVATE double
|
|
viter_do_iteration (histogram * hist, colormap * const map,
|
|
const float min_opaque_val, viter_callback callback,
|
|
const bool fast_palette)
|
|
{
|
|
viter_state *average_color;
|
|
const unsigned int max_threads = omp_get_max_threads ();
|
|
double total_diff = 0;
|
|
|
|
average_color =
|
|
g_alloca (sizeof (viter_state) * (VITER_CACHE_LINE_GAP +
|
|
map->colors) * max_threads);
|
|
|
|
viter_init (map, max_threads, average_color);
|
|
{
|
|
struct nearest_map *const n = nearest_init (map, fast_palette);
|
|
hist_item *const achv = hist->achv;
|
|
const int hist_size = hist->size;
|
|
int j;
|
|
|
|
#pragma omp parallel for if (hist_size > 3000) \
|
|
schedule(static) default(none) shared(average_color,callback) reduction(+:total_diff)
|
|
for (j = 0; j < hist_size; j++) {
|
|
float diff;
|
|
unsigned int match =
|
|
nearest_search (n, achv[j].acolor, achv[j].tmp.likely_colormap_index,
|
|
min_opaque_val, &diff);
|
|
achv[j].tmp.likely_colormap_index = match;
|
|
total_diff += diff * achv[j].perceptual_weight;
|
|
|
|
viter_update_color (achv[j].acolor, achv[j].perceptual_weight, map, match,
|
|
omp_get_thread_num (), average_color);
|
|
|
|
if (callback)
|
|
callback (&achv[j], diff);
|
|
}
|
|
|
|
nearest_free (n);
|
|
}
|
|
viter_finalize (map, max_threads, average_color);
|
|
|
|
return total_diff / hist->total_perceptual_weight;
|
|
}
|