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GRAPHICS: Allow in-place conversion with any color formats in crossBlit.

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This commit is contained in:
Johannes Schickel 2012-07-14 05:35:20 +02:00
parent 0d78d46a0e
commit a92a509ac8
2 changed files with 60 additions and 19 deletions
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54
graphics/conversion.cpp
View file

@ -30,7 +30,7 @@ namespace Graphics {
namespace {
template<typename SrcColor, typename DstColor>
template<typename SrcColor, typename DstColor, bool backward>
FORCEINLINE void crossBlitLogic(byte *dst, const byte *src, const uint w, const uint h,
const PixelFormat &srcFmt, const PixelFormat &dstFmt,
const uint srcDelta, const uint dstDelta) {
@ -41,15 +41,27 @@ FORCEINLINE void crossBlitLogic(byte *dst, const byte *src, const uint w, const
srcFmt.colorToARGB(color, a, r, g, b);
color = dstFmt.ARGBToColor(a, r, g, b);
*(DstColor *)dst = color;
if (backward) {
src -= sizeof(SrcColor);
dst -= sizeof(DstColor);
} else {
src += sizeof(SrcColor);
dst += sizeof(DstColor);
}
}
if (backward) {
src -= srcDelta;
dst -= dstDelta;
} else {
src += srcDelta;
dst += dstDelta;
}
}
}
template<typename DstColor>
template<typename DstColor, bool backward>
FORCEINLINE void crossBlitLogic3BppSource(byte *dst, const byte *src, const uint w, const uint h,
const PixelFormat &srcFmt, const PixelFormat &dstFmt,
const uint srcDelta, const uint dstDelta) {
@ -65,13 +77,25 @@ FORCEINLINE void crossBlitLogic3BppSource(byte *dst, const byte *src, const uint
srcFmt.colorToARGB(color, a, r, g, b);
color = dstFmt.ARGBToColor(a, r, g, b);
*(DstColor *)dst = color;
if (backward) {
src -= 3;
dst -= sizeof(DstColor);
} else {
src += 3;
dst += sizeof(DstColor);
}
}
if (backward) {
src -= srcDelta;
dst -= dstDelta;
} else {
src += srcDelta;
dst += dstDelta;
}
}
}
} // End of anonymous namespace
@ -110,19 +134,33 @@ bool crossBlit(byte *dst, const byte *src,
// TODO: optimized cases for dstDelta of 0
if (dstFmt.bytesPerPixel == 2) {
if (srcFmt.bytesPerPixel == 2) {
crossBlitLogic<uint16, uint16>(dst, src, w, h, srcFmt, dstFmt, srcDelta, dstDelta);
crossBlitLogic<uint16, uint16, false>(dst, src, w, h, srcFmt, dstFmt, srcDelta, dstDelta);
} else if (srcFmt.bytesPerPixel == 3) {
crossBlitLogic3BppSource<uint16>(dst, src, w, h, srcFmt, dstFmt, srcDelta, dstDelta);
crossBlitLogic3BppSource<uint16, false>(dst, src, w, h, srcFmt, dstFmt, srcDelta, dstDelta);
} else {
crossBlitLogic<uint32, uint16>(dst, src, w, h, srcFmt, dstFmt, srcDelta, dstDelta);
crossBlitLogic<uint32, uint16, false>(dst, src, w, h, srcFmt, dstFmt, srcDelta, dstDelta);
}
} else if (dstFmt.bytesPerPixel == 4) {
if (srcFmt.bytesPerPixel == 2) {
crossBlitLogic<uint16, uint32>(dst, src, w, h, srcFmt, dstFmt, srcDelta, dstDelta);
// We need to blit the surface from bottom right to top left here.
// This is neeeded, because when we convert to the same memory
// buffer copying the surface from top left to bottom right would
// overwrite the source, since we have more bits per destination
// color than per source color.
dst += h * dstPitch - dstDelta - dstFmt.bytesPerPixel;
src += h * srcPitch - srcDelta - srcFmt.bytesPerPixel;
crossBlitLogic<uint16, uint32, true>(dst, src, w, h, srcFmt, dstFmt, srcDelta, dstDelta);
} else if (srcFmt.bytesPerPixel == 3) {
crossBlitLogic3BppSource<uint32>(dst, src, w, h, srcFmt, dstFmt, srcDelta, dstDelta);
// We need to blit the surface from bottom right to top left here.
// This is neeeded, because when we convert to the same memory
// buffer copying the surface from top left to bottom right would
// overwrite the source, since we have more bits per destination
// color than per source color.
dst += h * dstPitch - dstDelta - dstFmt.bytesPerPixel;
src += h * srcPitch - srcDelta - srcFmt.bytesPerPixel;
crossBlitLogic3BppSource<uint32, true>(dst, src, w, h, srcFmt, dstFmt, srcDelta, dstDelta);
} else {
crossBlitLogic<uint32, uint32>(dst, src, w, h, srcFmt, dstFmt, srcDelta, dstDelta);
crossBlitLogic<uint32, uint32, false>(dst, src, w, h, srcFmt, dstFmt, srcDelta, dstDelta);
}
} else {
return false;

9
graphics/conversion.h
View file

@ -60,9 +60,12 @@ inline static void RGB2YUV(byte r, byte g, byte b, byte &y, byte &u, byte &v) {
* false if there is an error.
*
* @note Blitting to a 3Bpp destination is not supported
* @note This can convert a rectangle in place, if the source and
* destination format have the same bytedepth.
*
* @note This can convert a surface in place, regardless of the
* source and destination format, as long as there is enough
* space for the destination. The dstPitch / srcPitch ratio
* must at least equal the dstBpp / srcBpp ratio for
* dstPitch >= srcPitch and at most dstBpp / srcBpp for
* dstPitch < srcPitch though.
*/
bool crossBlit(byte *dst, const byte *src,
const uint dstPitch, const uint srcPitch,