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GRAPHICS: Add fast paths for scaleBlit when dstW == srcW

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This commit is contained in:
Cameron Cawley 2023-12-27 14:33:40 +00:00 committed by Filippos Karapetis
parent 077d4121a1
commit f3486a162d
1 changed files with 42 additions and 17 deletions
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59
graphics/blit/blit-scale.cpp
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@ -35,12 +35,31 @@ namespace Graphics {
namespace {
static void scaleVertical(byte *dst, const byte *src,
const uint dstPitch, const uint srcPitch,
const uint w, const uint dstH, const uint srcH,
const byte flip, const uint bytesPerPixel) {
const bool flipy = flip & FLIP_V;
const int dstIncY = (flipy ? -static_cast<int>(dstPitch) : static_cast<int>(dstPitch));
if (flipy) {
dst += (dstH - 1) * dstPitch;
}
for (uint y = 0; y < dstH; y++) {
const byte *srcP = src + ((y * srcH) / dstH) * srcPitch;
memcpy(dst, srcP, w * bytesPerPixel);
dst += dstIncY;
}
}
template <typename Size>
void scaleNN(byte *dst, const byte *src,
static void scaleNN(byte *dst, const byte *src,
const uint dstPitch, const uint srcPitch,
const uint dstW, const uint dstH,
const uint srcW, const uint srcH,
int *scaleCacheX, const byte flip) {
const byte flip) {
const bool flipx = flip & FLIP_H;
const bool flipy = flip & FLIP_V;
@ -55,6 +74,11 @@ void scaleNN(byte *dst, const byte *src,
dst += (dstH - 1) * dstPitch;
}
int *scaleCacheX = new int[dstW];
for (uint x = 0; x < dstW; x++) {
scaleCacheX[x] = (x * srcW) / dstW;
}
for (uint y = 0; y < dstH; y++) {
const Size *srcP = (const Size *)(src + ((y * srcH) / dstH) * srcPitch);
Size *dst1 = (Size *)dst;
@ -65,6 +89,8 @@ void scaleNN(byte *dst, const byte *src,
}
dst += dstIncY;
}
delete[] scaleCacheX;
}
} // End of anonymous namespace
@ -75,30 +101,29 @@ bool scaleBlit(byte *dst, const byte *src,
const uint srcW, const uint srcH,
const Graphics::PixelFormat &fmt,
const byte flip) {
int *scaleCacheX = new int[dstW];
for (uint x = 0; x < dstW; x++) {
scaleCacheX[x] = (x * srcW) / dstW;
if (dstW == srcW && !(flip & FLIP_H)) {
if (dstH == srcH && !(flip & FLIP_V))
copyBlit(dst, src, dstPitch, srcPitch, dstW, dstH, fmt.bytesPerPixel);
else
scaleVertical(dst, src, dstPitch, srcPitch, dstW, dstH, srcH, flip, fmt.bytesPerPixel);
return true;
}
switch (fmt.bytesPerPixel) {
case 1:
scaleNN<uint8>(dst, src, dstPitch, srcPitch, dstW, dstH, srcW, srcH, scaleCacheX, flip);
break;
scaleNN<uint8>(dst, src, dstPitch, srcPitch, dstW, dstH, srcW, srcH, flip);
return true;
case 2:
scaleNN<uint16>(dst, src, dstPitch, srcPitch, dstW, dstH, srcW, srcH, scaleCacheX, flip);
break;
scaleNN<uint16>(dst, src, dstPitch, srcPitch, dstW, dstH, srcW, srcH, flip);
return true;
case 4:
scaleNN<uint32>(dst, src, dstPitch, srcPitch, dstW, dstH, srcW, srcH, scaleCacheX, flip);
break;
scaleNN<uint32>(dst, src, dstPitch, srcPitch, dstW, dstH, srcW, srcH, flip);
return true;
default:
delete[] scaleCacheX;
return false;
break;
}
delete[] scaleCacheX;
return true;
return false;
}
/*