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Modify InitLUT to make use of ColorMasks, making it easier to add support for other color modes eventually. This also fixes the computation of LUT16to32 which so far always assumed 565 mode.

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svn-id: r21970
This commit is contained in:
Max Horn 2006-04-17 11:11:07 +00:00
parent 2732ed3dce
commit 35a2fc4028
1 changed files with 25 additions and 31 deletions
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56
graphics/scaler.cpp
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@ -73,46 +73,40 @@ uint RGBtoYUVstorage[65536];
uint *RGBtoYUV = RGBtoYUVstorage;
uint LUT16to32[65536];
}
template<class T>
void InitLUT() {
int r, g, b;
int Y, u, v;
assert(T::kBytesPerPixel == 2);
for (int color = 0; color < 65536; ++color) {
r = ((color & T::kRedMask) >> T::kRedShift) << (8 - T::kRedBits);
g = ((color & T::kGreenMask) >> T::kGreenShift) << (8 - T::kGreenBits);
b = ((color & T::kBlueMask) >> T::kBlueShift) << (8 - T::kBlueBits);
LUT16to32[color] = (r << 16) | (g << 8) | b;
Y = (r + g + b) >> 2;
u = 128 + ((r - b) >> 2);
v = 128 + ((-r + 2 * g - b) >> 3);
RGBtoYUV[color] = (Y << 16) | (u << 8) | v;
}
}
#endif
static void InitLUT(uint32 BitFormat);
void InitScalers(uint32 BitFormat) {
gBitFormat = BitFormat;
InitLUT(gBitFormat);
}
void InitLUT(uint32 BitFormat) {
#ifndef DISABLE_HQ_SCALERS
int r, g, b;
int Y, u, v;
int gInc, gShift;
for (int i = 0; i < 65536; i++) {
LUT16to32[i] = ((i & 0xF800) << 8) + ((i & 0x07E0) << 5) + ((i & 0x001F) << 3);
}
if (BitFormat == 565) {
gInc = 256 >> 6;
gShift = 6 - 3;
} else {
gInc = 256 >> 5;
gShift = 5 - 3;
}
for (r = 0; r < 256; r += 8) {
for (g = 0; g < 256; g += gInc) {
for (b = 0; b < 256; b += 8) {
Y = (r + g + b) >> 2;
u = 128 + ((r - b) >> 2);
v = 128 + ((-r + 2 * g - b) >> 3);
RGBtoYUV[ (r << (5 + gShift)) + (g << gShift) + (b >> 3) ] = (Y << 16) + (u << 8) + v;
}
}
}
if (gBitFormat == 555)
InitLUT<ColorMasks<555> >();
if (gBitFormat == 565)
InitLUT<ColorMasks<565> >();
#endif
}
/**
* Trivial 'scaler' - in fact it doesn't do any scaling but just copies the
* source to the destionation.