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FS-7500: switch_img_overlay now support ARGB and negtive position, also change alpha value to match doc description

This commit is contained in:
Seven Du 2015-05-05 19:00:31 +08:00 committed by Michael Jerris
parent 72db8c58d1
commit bfecc842df
1 changed files with 32 additions and 10 deletions
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42
src/switch_core_video.c
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@ -336,6 +336,9 @@ SWITCH_DECLARE(void) switch_img_fill(switch_image_t *img, int x, int y, int w, i
SWITCH_DECLARE(void) switch_img_get_yuv_pixel(switch_image_t *img, switch_yuv_color_t *yuv, int x, int y)
{
// switch_assert(img->fmt == SWITCH_IMG_FMT_I420);
if (x < 0 || y < 0 || x >= img->d_w || y >= img->d_h) return;
yuv->y = *(img->planes[SWITCH_PLANE_Y] + img->stride[SWITCH_PLANE_Y] * y + x);
yuv->u = *(img->planes[SWITCH_PLANE_U] + img->stride[SWITCH_PLANE_U] * y / 2 + x / 2);
yuv->v = *(img->planes[SWITCH_PLANE_V] + img->stride[SWITCH_PLANE_V] * y / 2 + x / 2);
@ -343,10 +346,19 @@ SWITCH_DECLARE(void) switch_img_get_yuv_pixel(switch_image_t *img, switch_yuv_co
SWITCH_DECLARE(void) switch_img_get_rgb_pixel(switch_image_t *img, switch_rgb_color_t *rgb, int x, int y)
{
switch_yuv_color_t yuv;
if (x < 0 || y < 0 || x >= img->d_w || y >= img->d_h) return;
switch_img_get_yuv_pixel(img, &yuv, x, y);
switch_color_yuv2rgb(&yuv, rgb);
if (img->fmt == SWITCH_IMG_FMT_I420) {
switch_yuv_color_t yuv;
switch_img_get_yuv_pixel(img, &yuv, x, y);
switch_color_yuv2rgb(&yuv, rgb);
} else if (img->fmt == SWITCH_IMG_FMT_ARGB) {
uint8_t *a = img->planes[SWITCH_PLANE_PACKED] + img->d_w * 4 * y + 4 * x;
rgb->r = *(++a);
rgb->g = *(++a);
rgb->b = *(++a);
}
}
SWITCH_DECLARE(void) switch_img_overlay(switch_image_t *IMG, switch_image_t *img, int x, int y, uint8_t alpha)
@ -354,12 +366,22 @@ SWITCH_DECLARE(void) switch_img_overlay(switch_image_t *IMG, switch_image_t *img
int i, j, len, max_h;
switch_rgb_color_t RGB, rgb, c;
switch_yuv_color_t yuv;
int xoff = 0, yoff = 0;
switch_assert(img->fmt == SWITCH_IMG_FMT_I420);
switch_assert(IMG->fmt == SWITCH_IMG_FMT_I420);
max_h = MIN(y + img->d_h, IMG->d_h);
len = MIN(img->d_w, IMG->d_w - x);
if (x < 0) {
xoff = -x;
x = 0;
}
if (y < 0) {
yoff = -y;
y = 0;
}
max_h = MIN(y + img->d_h - yoff, IMG->d_h);
len = MIN(img->d_w - xoff, IMG->d_w - x);
if (x & 1) { x++; len--; }
if (y & 1) y++;
@ -368,11 +390,11 @@ SWITCH_DECLARE(void) switch_img_overlay(switch_image_t *IMG, switch_image_t *img
for (i = y; i < max_h; i++) {
for (j = 0; j < len; j++) {
switch_img_get_rgb_pixel(IMG, &RGB, x + j, i);
switch_img_get_rgb_pixel(img, &rgb, j, i - y);
switch_img_get_rgb_pixel(img, &rgb, j + xoff, i - y + yoff);
c.r = ((RGB.r * alpha) >> 8) + ((rgb.r * (255 - alpha)) >> 8);
c.g = ((RGB.g * alpha) >> 8) + ((rgb.g * (255 - alpha)) >> 8);
c.b = ((RGB.b * alpha) >> 8) + ((rgb.b * (255 - alpha)) >> 8);
c.r = ((RGB.r * (255 - alpha)) >> 8) + ((rgb.r * alpha) >> 8);
c.g = ((RGB.g * (255 - alpha)) >> 8) + ((rgb.g * alpha) >> 8);
c.b = ((RGB.b * (255 - alpha)) >> 8) + ((rgb.b * alpha) >> 8);
switch_color_rgb2yuv(&c, &yuv);
switch_img_draw_pixel(IMG, x + j, i, &yuv);