void blend_ass_image(AVPicture *dest, const ASS_Image *image, int imgw,
int imgh, enum PixelFormat pixel_format)
{
uint8_t rgba_color[] =
{ AR(image->color), AG(image->color), AB(image->color), AA(image->color) };
uint8_t rect_r, rect_g, rect_b, rect_a;
int dest_r, dest_g, dest_b, dest_a;
int x, y;
uint32_t *dst2;
uint8_t *src, *src2;
uint8_t *dst = dest->data[0];
if (pixel_format != PIX_FMT_RGBA)
return;
dst += image->dst_y * dest->linesize[0] + image->dst_x * 4;
src = image->bitmap;
for (y = 0; y < image->h; y++)
{
dst2 = (uint32_t *) dst;
src2 = src;
for (x = 0; x < image->w; x++)
{
uint8_t image_pixel = *(src2++);
uint32_t *pixel = (dst2++);
rect_r = image_pixel & rgba_color[0];
rect_g = image_pixel & rgba_color[1];
rect_b = image_pixel & rgba_color[2];
rect_a = image_pixel & rgba_color[3];
RGBA_IN(dest_r, dest_g, dest_b, dest_a, pixel);
// write subtitle on the image
dest_r = ALPHA_BLEND_RGB(dest_r, rect_r, rect_a);
dest_g = ALPHA_BLEND_RGB(dest_g, rect_g, rect_a);
dest_b = ALPHA_BLEND_RGB(dest_b, rect_b, rect_a);
RGBA_OUT(pixel, dest_r, dest_g, dest_b, dest_a);
}
dst += dest->linesize[0];
src += image->stride;
}
}
void blend_subrect_rgba(AVPicture *dest, const AVSubtitleRect *rect, int imgw,
int imgh, enum PixelFormat pixel_format)
{
int rect_r, rect_g, rect_b, rect_a;
int dest_r, dest_g, dest_b, dest_a;
uint32_t *pal;
uint32_t *dst2;
uint8_t *src, *src2;
int x, y;
uint8_t *dst = dest->data[0];
if (pixel_format != PIX_FMT_RGBA)
return;
dst += rect->y * dest->linesize[0] + rect->x * 4;
src = rect->pict.data[0];
pal = (uint32_t *) rect->pict.data[1];
for (y = 0; y < rect->h; y++)
{
dst2 = (uint32_t *) dst;
src2 = src;
for (x = 0; x < rect->w; x++)
{
uint32_t *rect_pixel = &pal[*(src2++)];
uint32_t *pixel = (dst2++);
// read subtitle rgba8888
RGBA_IN(rect_r, rect_g, rect_b, rect_a, rect_pixel);
RGBA_IN(dest_r, dest_g, dest_b, dest_a, pixel);
// write subtitle on the image
dest_r = ALPHA_BLEND_RGB(dest_r, rect_r, rect_a);
dest_g = ALPHA_BLEND_RGB(dest_g, rect_g, rect_a);
dest_b = ALPHA_BLEND_RGB(dest_b, rect_b, rect_a);
RGBA_OUT(pixel, dest_r, dest_g, dest_b, dest_a);
}
dst += dest->linesize[0];
src += rect->pict.linesize[0];
}
}
/* N->1 blending with per-surface alpha */
static void
BlitNto1SurfaceAlpha(SDL_BlitInfo * info)
{
int width = info->dst_w;
int height = info->dst_h;
Uint8 *src = info->src;
int srcskip = info->src_skip;
Uint8 *dst = info->dst;
int dstskip = info->dst_skip;
Uint8 *palmap = info->table;
SDL_PixelFormat *srcfmt = info->src_fmt;
SDL_PixelFormat *dstfmt = info->dst_fmt;
int srcbpp = srcfmt->BytesPerPixel;
Uint32 Pixel;
unsigned sR, sG, sB;
unsigned dR, dG, dB;
const unsigned A = info->a;
while (height--) {
/* *INDENT-OFF* */
DUFFS_LOOP4(
{
DISEMBLE_RGB(src, srcbpp, srcfmt, Pixel, sR, sG, sB);
dR = dstfmt->palette->colors[*dst].r;
dG = dstfmt->palette->colors[*dst].g;
dB = dstfmt->palette->colors[*dst].b;
ALPHA_BLEND_RGB(sR, sG, sB, A, dR, dG, dB);
dR &= 0xff;
dG &= 0xff;
dB &= 0xff;
/* Pack RGB into 8bit pixel */
if ( palmap == NULL ) {
*dst =((dR>>5)<<(3+2))|((dG>>5)<<(2))|((dB>>6)<<(0));
} else {
*dst = palmap[((dR>>5)<<(3+2))|((dG>>5)<<(2))|((dB>>6)<<(0))];
}
dst++;
src += srcbpp;
},
