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-rw-r--r--graphics/scaler/downscaler.cpp41
1 files changed, 41 insertions, 0 deletions
diff --git a/graphics/scaler/downscaler.cpp b/graphics/scaler/downscaler.cpp
index 7b2e7c70c4..53e90bb996 100644
--- a/graphics/scaler/downscaler.cpp
+++ b/graphics/scaler/downscaler.cpp
@@ -35,6 +35,8 @@ void DownscaleAllByHalf(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uin
static const int roundingconstants[] = { 0x00200802, 0x00201002 };
static const int redbluegreenMasks[] = { 0x03E07C1F, 0x07E0F81F };
+ extern int gBitFormat;
+
const int maskUsed = (gBitFormat == 565);
DownscaleAllByHalfARM(srcPtr, srcPitch, dstPtr, dstPitch, width, height, redbluegreenMasks[maskUsed], roundingconstants[maskUsed]);
}
@@ -108,3 +110,42 @@ void DownscaleHorizByHalf(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, u
else
DownscaleHorizByHalfTemplate<Graphics::ColorMasks<555> >(srcPtr, srcPitch, dstPtr, dstPitch, width, height);
}
+
+/**
+ * This filter (down)scales the source image horizontally by a factor of 3/4.
+ * For example, a 320x200 image is scaled to 240x200.
+ */
+template<typename ColorMask>
+void DownscaleHorizByThreeQuartersTemplate(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height) {
+ uint16 *work;
+
+ // Various casts below go via (void *) to avoid warning. This is
+ // safe as these are all even addresses.
+ while (height--) {
+ work = (uint16 *)(void *)dstPtr;
+
+ for (int i = 0; i < width; i += 4) {
+ // Work with 4 pixels
+ uint16 color1 = *(((const uint16 *)(const void *)srcPtr) + i);
+ uint16 color2 = *(((const uint16 *)(const void *)srcPtr) + (i + 1));
+ uint16 color3 = *(((const uint16 *)(const void *)srcPtr) + (i + 2));
+ uint16 color4 = *(((const uint16 *)(const void *)srcPtr) + (i + 3));
+
+ work[0] = interpolate32_3_1<ColorMask>(color1, color2);
+ work[1] = interpolate32_1_1<ColorMask>(color2, color3);
+ work[2] = interpolate32_3_1<ColorMask>(color4, color3);
+
+ work += 3;
+ }
+ srcPtr += srcPitch;
+ dstPtr += dstPitch;
+ }
+}
+
+void DownscaleHorizByThreeQuarters(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height) {
+ extern int gBitFormat;
+ if (gBitFormat == 565)
+ DownscaleHorizByThreeQuartersTemplate<Graphics::ColorMasks<565> >(srcPtr, srcPitch, dstPtr, dstPitch, width, height);
+ else
+ DownscaleHorizByThreeQuartersTemplate<Graphics::ColorMasks<555> >(srcPtr, srcPitch, dstPtr, dstPitch, width, height);
+}