pandory500/SDL-mirror
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Added NV12 and NV21 texture support for OpenGL and OpenGL ES 2.0 renderers

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This commit is contained in:
Sam Lantinga 2014-08-06 11:34:54 -07:00
parent 298925e01f
commit c7790bdb2b
12 changed files with 456 additions and 183 deletions
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35
src/video/SDL_surface.c
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@ -1005,7 +1005,7 @@ int SDL_ConvertPixels(int width, int height,
SDL_Rect rect;
void *nonconst_src = (void *) src;
/* Check to make sure we are bliting somewhere, so we don't crash */
/* Check to make sure we are blitting somewhere, so we don't crash */
if (!dst) {
return SDL_InvalidParamError("dst");
}
@ -1015,17 +1015,21 @@ int SDL_ConvertPixels(int width, int height,
/* Fast path for same format copy */
if (src_format == dst_format) {
int bpp;
int bpp, i;
if (SDL_ISPIXELFORMAT_FOURCC(src_format)) {
switch (src_format) {
case SDL_PIXELFORMAT_YV12:
case SDL_PIXELFORMAT_IYUV:
case SDL_PIXELFORMAT_YUY2:
case SDL_PIXELFORMAT_UYVY:
case SDL_PIXELFORMAT_YVYU:
bpp = 2;
break;
case SDL_PIXELFORMAT_YV12:
case SDL_PIXELFORMAT_IYUV:
case SDL_PIXELFORMAT_NV12:
case SDL_PIXELFORMAT_NV21:
bpp = 1;
break;
default:
return SDL_SetError("Unknown FOURCC pixel format");
}
@ -1034,11 +1038,32 @@ int SDL_ConvertPixels(int width, int height,
}
width *= bpp;
while (height-- > 0) {
for (i = height; i--;) {
SDL_memcpy(dst, src, width);
src = (Uint8*)src + src_pitch;
dst = (Uint8*)dst + dst_pitch;
}
if (src_format == SDL_PIXELFORMAT_YV12 || src_format == SDL_PIXELFORMAT_IYUV) {
/* U and V planes are a quarter the size of the Y plane */
width /= 2;
height /= 2;
src_pitch /= 2;
dst_pitch /= 2;
for (i = height * 2; i--;) {
SDL_memcpy(dst, src, width);
src = (Uint8*)src + src_pitch;
dst = (Uint8*)dst + dst_pitch;
}
} else if (src_format == SDL_PIXELFORMAT_NV12 || src_format == SDL_PIXELFORMAT_NV21) {
/* U/V plane is half the height of the Y plane */
height /= 2;
for (i = height; i--;) {
SDL_memcpy(dst, src, width);
src = (Uint8*)src + src_pitch;
dst = (Uint8*)dst + dst_pitch;
}
}
return 0;
}