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-rw-r--r--graphics/scaler.cpp56
1 files changed, 25 insertions, 31 deletions
diff --git a/graphics/scaler.cpp b/graphics/scaler.cpp
index 3311ba22e2..1853742ce2 100644
--- a/graphics/scaler.cpp
+++ b/graphics/scaler.cpp
@@ -73,46 +73,40 @@ uint RGBtoYUVstorage[65536];
uint *RGBtoYUV = RGBtoYUVstorage;
uint LUT16to32[65536];
}
-#endif
-
-static void InitLUT(uint32 BitFormat);
-void InitScalers(uint32 BitFormat) {
- gBitFormat = BitFormat;
- InitLUT(gBitFormat);
-}
-
-void InitLUT(uint32 BitFormat) {
-#ifndef DISABLE_HQ_SCALERS
+template<class T>
+void InitLUT() {
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);
+
+ 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
- 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;
- }
- }
- }
+void InitScalers(uint32 BitFormat) {
+ gBitFormat = BitFormat;
+#ifndef DISABLE_HQ_SCALERS
+ 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.