From 0fc137cdf2f04d676b196efb6bc0599efd53e84f Mon Sep 17 00:00:00 2001
From: Max Horn
Date: Mon, 8 Mar 2010 10:31:09 +0000
Subject: Rename PocketPCPortrait scaler to DownscaleHorizByThreeQuarters, and
 move it to graphics/scaler.

svn-id: r48191
---
 graphics/scaler/downscaler.cpp | 41 +++++++++++++++++++++++++++++++++++++++++
 graphics/scaler/downscaler.h   |  6 ++++++
 2 files changed, 47 insertions(+)

(limited to 'graphics/scaler')

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);
+}
diff --git a/graphics/scaler/downscaler.h b/graphics/scaler/downscaler.h
index 115ad945e5..158b187940 100644
--- a/graphics/scaler/downscaler.h
+++ b/graphics/scaler/downscaler.h
@@ -41,4 +41,10 @@ DECLARE_SCALER(DownscaleAllByHalf);
  */
 DECLARE_SCALER(DownscaleHorizByHalf);
 
+/**
+ * This filter (down)scales the source image horizontally by a factor of 3/4.
+ * For example, a 320x200 image is scaled to 240x200.
+ */
+DECLARE_SCALER(DownscaleHorizByThreeQuarters);
+
 #endif
-- 
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