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Added the ability to update a subrect of a YV12/IYUV texture.

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This commit is contained in:
Sam Lantinga 2011-12-30 18:19:35 -05:00
parent 98615b55aa
commit 5e38454931
1 changed files with 41 additions and 8 deletions
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49
src/render/SDL_yuv_sw.c
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@ -1119,15 +1119,48 @@ SDL_SW_UpdateYUVTexture(SDL_SW_YUVTexture * swdata, const SDL_Rect * rect,
switch (swdata->format) {
case SDL_PIXELFORMAT_YV12:
case SDL_PIXELFORMAT_IYUV:
if (rect
&& (rect->x != 0 || rect->y != 0 || rect->w != swdata->w
|| rect->h != swdata->h)) {
SDL_SetError
("YV12 and IYUV textures only support full surface updates");
return -1;
if (rect->x == 0 && rect->y == 0 &&
rect->w == swdata->w && rect->h == swdata->h) {
SDL_memcpy(swdata->pixels, pixels,
(swdata->h * swdata->w) + (swdata->h * swdata->w) / 2);
} else {
Uint8 *src, *dst;
int row;
size_t length;
/* Copy the Y plane */
src = (Uint8 *) pixels;
dst = swdata->pixels + rect->y * swdata->w + rect->x;
length = rect->w;
for (row = 0; row < rect->h; ++row) {
SDL_memcpy(dst, src, length);
src += pitch;
dst += swdata->w;
}
/* Copy the next plane */
src = (Uint8 *) pixels + rect->h * pitch;
dst = swdata->pixels + swdata->h * swdata->w;
dst += rect->y/2 * swdata->w/2 + rect->x/2;
length = rect->w / 2;
for (row = 0; row < rect->h/2; ++row) {
SDL_memcpy(dst, src, length);
src += pitch/2;
dst += swdata->w/2;
}
/* Copy the next plane */
src = (Uint8 *) pixels + rect->h * pitch + (rect->h * pitch) / 4;
dst = swdata->pixels + swdata->h * swdata->w +
(swdata->h * swdata->w) / 4;
dst += rect->y/2 * swdata->w/2 + rect->x/2;
length = rect->w / 2;
for (row = 0; row < rect->h/2; ++row) {
SDL_memcpy(dst, src, length);
src += pitch/2;
dst += swdata->w/2;
}
}
SDL_memcpy(swdata->pixels, pixels,
(swdata->h * swdata->w) + (swdata->h * swdata->w) / 2);
break;
case SDL_PIXELFORMAT_YUY2:
case SDL_PIXELFORMAT_UYVY: