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Added unaligned version of SDL_ConvertPixels_SwapNV_std()

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Fixes https://github.com/libsdl-org/SDL/issues/12546
This commit is contained in:
Sam Lantinga
2025-03-15 09:12:04 -07:00
parent ad9f9af4ed
commit 501e71f25f
1 changed files with 31 additions and 13 deletions
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44
src/video/SDL_yuv.c
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@@ -1628,26 +1628,44 @@ static bool SDL_ConvertPixels_SwapNV_std(int width, int height, const void *src,
const int UVwidth = (width + 1) / 2;
const int UVheight = (height + 1) / 2;
const int srcUVPitch = ((src_pitch + 1) / 2) * 2;
const int srcUVPitchLeft = (srcUVPitch - UVwidth * 2) / sizeof(Uint16);
const int dstUVPitch = ((dst_pitch + 1) / 2) * 2;
const int dstUVPitchLeft = (dstUVPitch - UVwidth * 2) / sizeof(Uint16);
const Uint16 *srcUV;
Uint16 *dstUV;
// Skip the Y plane
src = (const Uint8 *)src + height * src_pitch;
dst = (Uint8 *)dst + height * dst_pitch;
srcUV = (const Uint16 *)src;
dstUV = (Uint16 *)dst;
y = UVheight;
while (y--) {
x = UVwidth;
while (x--) {
*dstUV++ = SDL_Swap16(*srcUV++);
bool aligned = (((uintptr_t)src | (uintptr_t)dst) & 1) == 0;
if (aligned) {
const int srcUVPitchLeft = (srcUVPitch - UVwidth * 2) / sizeof(Uint16);
const int dstUVPitchLeft = (dstUVPitch - UVwidth * 2) / sizeof(Uint16);
const Uint16 *srcUV = (const Uint16 *)src;
Uint16 *dstUV = (Uint16 *)dst;
y = UVheight;
while (y--) {
x = UVwidth;
while (x--) {
*dstUV++ = SDL_Swap16(*srcUV++);
}
srcUV += srcUVPitchLeft;
dstUV += dstUVPitchLeft;
}
} else {
const int srcUVPitchLeft = (srcUVPitch - UVwidth * 2);
const int dstUVPitchLeft = (dstUVPitch - UVwidth * 2);
const Uint8 *srcUV = (const Uint8 *)src;
Uint8 *dstUV = (Uint8 *)dst;
y = UVheight;
while (y--) {
x = UVwidth;
while (x--) {
Uint8 u = *srcUV++;
Uint8 v = *srcUV++;
*dstUV++ = v;
*dstUV++ = u;
}
srcUV += srcUVPitchLeft;
dstUV += dstUVPitchLeft;
}
srcUV += srcUVPitchLeft;
dstUV += dstUVPitchLeft;
}
return true;
}