From e1f95983923ffcb0624eef1fa6cf552eb54fe647 Mon Sep 17 00:00:00 2001
From: D G Turner
Date: Mon, 10 Oct 2011 01:54:33 +0100
Subject: GRAPHICS: Add YUV410 to RGB Conversion Functions, required for SVQ1.

Thanks to clone2727 for these.
---
 graphics/yuv_to_rgb.cpp | 60 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)

(limited to 'graphics/yuv_to_rgb.cpp')

diff --git a/graphics/yuv_to_rgb.cpp b/graphics/yuv_to_rgb.cpp
index ac7f217fee..e0af267106 100644
--- a/graphics/yuv_to_rgb.cpp
+++ b/graphics/yuv_to_rgb.cpp
@@ -300,4 +300,64 @@ void convertYUV420ToRGB(Graphics::Surface *dst, const byte *ySrc, const byte *uS
 		convertYUV420ToRGB<uint32>((byte *)dst->pixels, dst->pitch, lookup, ySrc, uSrc, vSrc, yWidth, yHeight, yPitch, uvPitch);
 }
 
+#define OUTPUT_4_PIXEL_COLUMN() \
+	PUT_PIXEL(*ySrc, dstPtr); \
+	PUT_PIXEL(*(ySrc + yPitch), dstPtr + dstPitch); \
+	PUT_PIXEL(*(ySrc + (yPitch << 1)), dstPtr + dstPitch * 2); \
+	PUT_PIXEL(*(ySrc + (yPitch * 3)), dstPtr + dstPitch * 3); \
+	ySrc++; \
+	dstPtr += sizeof(PixelInt)
+
+template<typename PixelInt>
+void convertYUV410ToRGB(byte *dstPtr, int dstPitch, const YUVToRGBLookup *lookup, const byte *ySrc, const byte *uSrc, const byte *vSrc, int yWidth, int yHeight, int yPitch, int uvPitch) {
+	int quarterHeight = yHeight >> 2;
+	int quarterWidth = yWidth >> 2;
+
+	// Keep the tables in pointers here to avoid a dereference on each pixel
+	const int16 *Cr_r_tab = lookup->_colorTab;
+	const int16 *Cr_g_tab = Cr_r_tab + 256;
+	const int16 *Cb_g_tab = Cr_g_tab + 256;
+	const int16 *Cb_b_tab = Cb_g_tab + 256;
+	const uint32 *rgbToPix = lookup->_rgbToPix;
+
+	for (int h = 0; h < quarterHeight; h++) {
+		for (int w = 0; w < quarterWidth; w++) {
+			register const uint32 *L;
+
+			int16 cr_r  = Cr_r_tab[*vSrc];
+			int16 crb_g = Cr_g_tab[*vSrc] + Cb_g_tab[*uSrc];
+			int16 cb_b  = Cb_b_tab[*uSrc];
+			++uSrc;
+			++vSrc;
+
+			OUTPUT_4_PIXEL_COLUMN();
+			OUTPUT_4_PIXEL_COLUMN();
+			OUTPUT_4_PIXEL_COLUMN();
+			OUTPUT_4_PIXEL_COLUMN();
+		}
+
+		dstPtr += dstPitch * 3;
+		ySrc += (yPitch << 2) - yWidth;
+		uSrc += uvPitch - quarterWidth;
+		vSrc += uvPitch - quarterWidth;
+	}
+}
+
+void convertYUV410ToRGB(Graphics::Surface *dst, const byte *ySrc, const byte *uSrc, const byte *vSrc, int yWidth, int yHeight, int yPitch, int uvPitch) {
+	// Sanity checks
+	assert(dst && dst->pixels);
+	assert(dst->format.bytesPerPixel == 2 || dst->format.bytesPerPixel == 4);
+	assert(ySrc && uSrc && vSrc);
+	assert((yWidth & 3) == 0);
+	assert((yHeight & 3) == 0);
+
+	const YUVToRGBLookup *lookup = YUVToRGBMan.getLookup(dst->format);
+
+	// Use a templated function to avoid an if check on every pixel
+	if (dst->format.bytesPerPixel == 2)
+		convertYUV410ToRGB<uint16>((byte *)dst->pixels, dst->pitch, lookup, ySrc, uSrc, vSrc, yWidth, yHeight, yPitch, uvPitch);
+	else
+		convertYUV410ToRGB<uint32>((byte *)dst->pixels, dst->pitch, lookup, ySrc, uSrc, vSrc, yWidth, yHeight, yPitch, uvPitch);
+}
+
 } // End of namespace Graphics
-- 
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