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FS-7500: add overlay func

This commit is contained in:
Seven Du 2015-02-13 20:08:31 +08:00 committed by Michael Jerris
parent e868e6eec9
commit 84a1f5f642
2 changed files with 53 additions and 0 deletions
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7
src/include/switch_core_video.h
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@ -197,6 +197,13 @@ SWITCH_DECLARE(void) switch_img_patch_hole(switch_image_t *IMG, switch_image_t *
SWITCH_DECLARE(switch_image_t *) switch_img_read_png(const char* file_name);
SWITCH_DECLARE(void) switch_img_write_png(switch_image_t *img, char* file_name);
SWITCH_DECLARE(void) switch_img_get_yuv_pixel(switch_image_t *img, switch_yuv_color_t *yuv, int x, int y);
SWITCH_DECLARE(void) switch_img_get_rgb_pixel(switch_image_t *img, switch_rgb_color_t *rgb, int x, int y);
SWITCH_DECLARE(void) switch_img_overlay(switch_image_t *IMG, switch_image_t *img, int x, int y, uint8_t alpha);
/** @} */
SWITCH_END_EXTERN_C

46
src/switch_core_video.c
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@ -215,6 +215,52 @@ 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)
{
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);
}
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;
switch_img_get_yuv_pixel(img, &yuv, x, y);
switch_color_yuv2rgb(&yuv, rgb);
}
SWITCH_DECLARE(void) switch_img_overlay(switch_image_t *IMG, switch_image_t *img, int x, int y, uint8_t alpha)
{
int i, j, len, max_h;
switch_rgb_color_t RGB, rgb, c;
switch_yuv_color_t yuv;
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 & 1) { x++; len--; }
if (y & 1) y++;
if (len <= 0) return;
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);
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);
switch_color_rgb2yuv(&c, &yuv);
switch_img_draw_pixel(IMG, x + j, i, &yuv);
}
}
}
static uint8_t scv_art[14][16] = {
{0x00, 0x7E, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x7E, 0x00},
{0x00, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x00},