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[core] fix patch alpha on alpna image

This commit is contained in:
Seven Du 2020-05-11 22:44:32 +08:00 committed by Andrey Volk
parent 5a95afe50f
commit ec29d5ef71
1 changed files with 18 additions and 10 deletions
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28
src/switch_core_video.c
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@ -325,7 +325,7 @@ static void switch_img_patch_rgb_noalpha(switch_image_t *IMG, switch_image_t *im
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;
uint8_t alpha;
switch_rgb_color_t *rgb, *RGB;
for (i = 0; i < max_h; i++) {
@ -334,19 +334,27 @@ static void switch_img_patch_rgb_noalpha(switch_image_t *IMG, switch_image_t *im
RGB = (switch_rgb_color_t *)(IMG->planes[SWITCH_PLANE_PACKED] + (y + i) * IMG->stride[SWITCH_PLANE_PACKED] + (x + j) * 4);
alpha = rgb->a;
if (RGB->a != 0) {
if (RGB->a == 0) {
*RGB = *rgb;
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;
continue;
}
if (alpha > 0) {
uint8_t delta1, delta2, delta;
delta1 = 255 - RGB->a;
delta2 = 255 - rgb->a;
delta = (delta1 * delta2) >> 8;
RGB->r = ((RGB->r * RGB->a) + (rgb->r * rgb->a)) / (RGB->a + rgb->a);
RGB->g = ((RGB->g * RGB->a) + (rgb->g * rgb->a)) / (RGB->a + rgb->a);
RGB->b = ((RGB->b * RGB->a) + (rgb->b * rgb->a)) / (RGB->a + rgb->a);
RGB->a = 255 - delta;
}
}
}
@ -394,7 +402,7 @@ SWITCH_DECLARE(void) switch_img_patch_rgb(switch_image_t *IMG, switch_image_t *i
int height = MIN(img->d_h, IMG->d_h - abs(y));
void (*ARGBBlendRow)(const uint8_t* src_argb, const uint8_t* src_argb1, uint8_t* dst_argb, int width) = GetARGBBlend();
switch_img_attenuate(img);
// switch_img_attenuate(img);
// Coalesce rows. we have same size images, treat as a single row
if (src_stride_argb0 == width * 4 &&