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FS-10050: [core] chromakey

This commit is contained in:
Anthony Minessale 2017-03-03 11:20:52 -06:00
parent 2f4c9b363e
commit 5ba5f0eda4
1 changed files with 43 additions and 12 deletions
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55
src/switch_core_video.c
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@ -302,7 +302,7 @@ SWITCH_DECLARE(void) switch_img_free(switch_image_t **img)
#define MAX(a,b) ((a) > (b) ? (a) : (b))
#endif
SWITCH_DECLARE(void) switch_img_patch_rgb(switch_image_t *IMG, switch_image_t *img, int x, int y, switch_bool_t noalpha)
static void switch_img_patch_rgb_noalpha(switch_image_t *IMG, switch_image_t *img, int x, int y)
{
int i;
@ -310,7 +310,7 @@ SWITCH_DECLARE(void) switch_img_patch_rgb(switch_image_t *IMG, switch_image_t *i
int max_w = MIN(img->d_w, IMG->d_w - abs(x));
int max_h = MIN(img->d_h, IMG->d_h - abs(y));
int j;
uint8_t alpha;
uint8_t alpha, alphadiff;
switch_rgb_color_t *rgb, *RGB;
for (i = 0; i < max_h; i++) {
@ -320,24 +320,55 @@ SWITCH_DECLARE(void) switch_img_patch_rgb(switch_image_t *IMG, switch_image_t *i
alpha = rgb->a;
if (noalpha && RGB->a != 0) {
if (RGB->a != 0) {
continue;
}
if (alpha == 255) {
*RGB = *rgb;
} else if (alpha != 0) {
alphadiff = 255 - alpha;
RGB->a = 255;
RGB->r = ((RGB->r * alphadiff) + (rgb->r * alpha)) >> 8;
RGB->g = ((RGB->g * alphadiff) + (rgb->g * alpha)) >> 8;
RGB->b = ((RGB->b * alphadiff) + (rgb->b * alpha)) >> 8;
}
}
}
}
}
int tmp_a;
SWITCH_DECLARE(void) switch_img_patch_rgb(switch_image_t *IMG, switch_image_t *img, int x, int y, switch_bool_t noalpha)
{
int i;
if (RGB->a != 255) {
tmp_a = ((RGB->a * (255 - alpha)) >> 8) + ((rgb->a * alpha) >> 8);
RGB->a = RGB->a > tmp_a ? RGB->a : tmp_a;
}
RGB->r = ((RGB->r * (255 - alpha)) >> 8) + ((rgb->r * alpha) >> 8);
RGB->g = ((RGB->g * (255 - alpha)) >> 8) + ((rgb->g * alpha) >> 8);
RGB->b = ((RGB->b * (255 - alpha)) >> 8) + ((rgb->b * alpha) >> 8);
if (noalpha) {
switch_img_patch_rgb_noalpha(IMG, img, x, y);
return;
}
if (img->fmt == SWITCH_IMG_FMT_ARGB && IMG->fmt == SWITCH_IMG_FMT_ARGB) {
int max_w = MIN(img->d_w, IMG->d_w - abs(x));
int max_h = MIN(img->d_h, IMG->d_h - abs(y));
int j;
uint8_t alpha, alphadiff;
switch_rgb_color_t *rgb, *RGB;
for (i = 0; i < max_h; i++) {
for (j = 0; j < max_w; j++) {
rgb = (switch_rgb_color_t *)(img->planes[SWITCH_PLANE_PACKED] + i * img->stride[SWITCH_PLANE_PACKED] + j * 4);
RGB = (switch_rgb_color_t *)(IMG->planes[SWITCH_PLANE_PACKED] + (y + i) * IMG->stride[SWITCH_PLANE_PACKED] + (x + j) * 4);
alpha = rgb->a;
if (alpha == 255) {
*RGB = *rgb;
} else if (alpha != 0) {
alphadiff = 255 - alpha;
RGB->a = 255;
RGB->r = ((RGB->r * alphadiff) + (rgb->r * alpha)) >> 8;
RGB->g = ((RGB->g * alphadiff) + (rgb->g * alpha)) >> 8;
RGB->b = ((RGB->b * alphadiff) + (rgb->b * alpha)) >> 8;
}
}
}