/*
* Copy a block of pixels of one format to another format
*/
int SDL_ConvertPixels(int width, int height,
Uint32 src_format, const void * src, int src_pitch,
Uint32 dst_format, void * dst, int dst_pitch)
{
SDL_Surface src_surface, dst_surface;
SDL_PixelFormat src_fmt, dst_fmt;
SDL_BlitMap src_blitmap, dst_blitmap;
SDL_Rect rect;
void *nonconst_src = (void *) src;
/* Check to make sure we are blitting somewhere, so we don't crash */
if (!dst) {
return SDL_InvalidParamError("dst");
}
if (!dst_pitch) {
return SDL_InvalidParamError("dst_pitch");
}
if (SDL_ISPIXELFORMAT_FOURCC(src_format) && SDL_ISPIXELFORMAT_FOURCC(dst_format)) {
return SDL_ConvertPixels_YUV_to_YUV(width, height, src_format, src, src_pitch, dst_format, dst, dst_pitch);
} else if (SDL_ISPIXELFORMAT_FOURCC(src_format)) {
return SDL_ConvertPixels_YUV_to_RGB(width, height, src_format, src, src_pitch, dst_format, dst, dst_pitch);
} else if (SDL_ISPIXELFORMAT_FOURCC(dst_format)) {
return SDL_ConvertPixels_RGB_to_YUV(width, height, src_format, src, src_pitch, dst_format, dst, dst_pitch);
}
/* Fast path for same format copy */
if (src_format == dst_format) {
int i;
const int bpp = SDL_BYTESPERPIXEL(src_format);
width *= bpp;
for (i = height; i--;) {
SDL_memcpy(dst, src, width);
src = (const Uint8*)src + src_pitch;
dst = (Uint8*)dst + dst_pitch;
}
return 0;
}
if (!SDL_CreateSurfaceOnStack(width, height, src_format, nonconst_src,
src_pitch,
&src_surface, &src_fmt, &src_blitmap)) {
return -1;
}
if (!SDL_CreateSurfaceOnStack(width, height, dst_format, dst, dst_pitch,
&dst_surface, &dst_fmt, &dst_blitmap)) {
return -1;
}
/* Set up the rect and go! */
rect.x = 0;
rect.y = 0;
rect.w = width;
rect.h = height;
return SDL_LowerBlit(&src_surface, &rect, &dst_surface, &rect);
}
/*
* Copy a block of pixels of one format to another format
*/
int SDL_ConvertPixels(int width, int height,
Uint32 src_format, const void * src, int src_pitch,
Uint32 dst_format, void * dst, int dst_pitch)
{
SDL_Surface src_surface, dst_surface;
SDL_PixelFormat src_fmt, dst_fmt;
SDL_BlitMap src_blitmap, dst_blitmap;
SDL_Rect rect;
/* Fast path for same format copy */
if (src_format == dst_format) {
int bpp;
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;
default:
SDL_SetError("Unknown FOURCC pixel format");
return -1;
}
} else {
bpp = SDL_BYTESPERPIXEL(src_format);
}
width *= bpp;
while (height-- > 0) {
SDL_memcpy(dst, src, width);
src = (Uint8*)src + src_pitch;
dst = (Uint8*)dst + dst_pitch;
}
return 0;
}
if (!SDL_CreateSurfaceOnStack(width, height, src_format, (void*)src,
src_pitch,
&src_surface, &src_fmt, &src_blitmap)) {
return -1;
}
if (!SDL_CreateSurfaceOnStack(width, height, dst_format, dst, dst_pitch,
&dst_surface, &dst_fmt, &dst_blitmap)) {
return -1;
}
/* Set up the rect and go! */
rect.x = 0;
rect.y = 0;
rect.w = width;
rect.h = height;
return SDL_LowerBlit(&src_surface, &rect, &dst_surface, &rect);
}
/*
* Copy a block of pixels of one format to another format
*/
int SDL_ConvertPixels(int width, int height,
Uint32 src_format, const void * src, int src_pitch,
Uint32 dst_format, void * dst, int dst_pitch)
{
SDL_Surface src_surface, dst_surface;
SDL_PixelFormat src_fmt, dst_fmt;
SDL_BlitMap src_blitmap, dst_blitmap;
SDL_Rect rect;
void *nonconst_src = (void *) src;
/* Check to make sure we are blitting somewhere, so we don't crash */
if (!dst) {
return SDL_InvalidParamError("dst");
}
if (!dst_pitch) {
return SDL_InvalidParamError("dst_pitch");
}
/* Fast path for same format copy */
if (src_format == dst_format) {
int bpp, i;
if (SDL_ISPIXELFORMAT_FOURCC(src_format)) {
switch (src_format) {
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");
}
} else {
bpp = SDL_BYTESPERPIXEL(src_format);
}
width *= bpp;
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;
}
if (!SDL_CreateSurfaceOnStack(width, height, src_format, nonconst_src,
src_pitch,
&src_surface, &src_fmt, &src_blitmap)) {
return -1;
}
if (!SDL_CreateSurfaceOnStack(width, height, dst_format, dst, dst_pitch,
&dst_surface, &dst_fmt, &dst_blitmap)) {
return -1;
}
/* Set up the rect and go! */
rect.x = 0;
rect.y = 0;
rect.w = width;
rect.h = height;
return SDL_LowerBlit(&src_surface, &rect, &dst_surface, &rect);
}
