3 files changed, 63 insertions, 8 deletions
diff --git a/graphics/decoders/jpeg.cpp b/graphics/decoders/jpeg.cpp
index 0cd2388d52..a871377ca1 100644
--- a/graphics/decoders/jpeg.cpp
+++ b/graphics/decoders/jpeg.cpp
@@ -20,8 +20,8 @@
  *
  */
 
-#include "graphics/conversion.h"
 #include "graphics/pixelformat.h"
+#include "graphics/yuv_to_rgb.h"
 #include "graphics/decoders/jpeg.h"
 
 #include "common/debug.h"
@@ -81,13 +81,7 @@ const Surface *JPEGDecoder::getSurface() const {
 	const Graphics::Surface *uComponent = getComponent(2);
 	const Graphics::Surface *vComponent = getComponent(3);
 
-	for (uint16 i = 0; i < _h; i++) {
-		for (uint16 j = 0; j < _w; j++) {
-			byte r = 0, g = 0, b = 0;
-			YUV2RGB(*((const byte *)yComponent->getBasePtr(j, i)), *((const byte *)uComponent->getBasePtr(j, i)), *((const byte *)vComponent->getBasePtr(j, i)), r, g, b);
-			*((uint32 *)_rgbSurface->getBasePtr(j, i)) = _rgbSurface->format.RGBToColor(r, g, b);
-		}
-	}
+	convertYUV444ToRGB(_rgbSurface, (byte *)yComponent->pixels, (byte *)uComponent->pixels, (byte *)vComponent->pixels, yComponent->w, yComponent->h, yComponent->pitch, uComponent->pitch);
 
 	return _rgbSurface;
 }
diff --git a/graphics/yuv_to_rgb.cpp b/graphics/yuv_to_rgb.cpp
index feda48bf6d..ac7f217fee 100644
--- a/graphics/yuv_to_rgb.cpp
+++ b/graphics/yuv_to_rgb.cpp
@@ -199,6 +199,52 @@ namespace Graphics {
 	*((PixelInt *)(d)) = (L[cr_r] | L[crb_g] | L[cb_b])
 
 template<typename PixelInt>
+void convertYUV444ToRGB(byte *dstPtr, int dstPitch, const YUVToRGBLookup *lookup, const byte *ySrc, const byte *uSrc, const byte *vSrc, int yWidth, int yHeight, int yPitch, int uvPitch) {
+	// 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 < yHeight; h++) {
+		for (int w = 0; w < yWidth; 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;
+
+			PUT_PIXEL(*ySrc, dstPtr);
+			ySrc++;
+			dstPtr += sizeof(PixelInt);
+		}
+
+		dstPtr += dstPitch - yWidth * sizeof(PixelInt);
+		ySrc += yPitch - yWidth;
+		uSrc += uvPitch - yWidth;
+		vSrc += uvPitch - yWidth;
+	}
+}
+
+void convertYUV444ToRGB(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);
+
+	const YUVToRGBLookup *lookup = YUVToRGBMan.getLookup(dst->format);
+
+	// Use a templated function to avoid an if check on every pixel
+	if (dst->format.bytesPerPixel == 2)
+		convertYUV444ToRGB<uint16>((byte *)dst->pixels, dst->pitch, lookup, ySrc, uSrc, vSrc, yWidth, yHeight, yPitch, uvPitch);
+	else
+		convertYUV444ToRGB<uint32>((byte *)dst->pixels, dst->pitch, lookup, ySrc, uSrc, vSrc, yWidth, yHeight, yPitch, uvPitch);
+}
+
+template<typename PixelInt>
 void convertYUV420ToRGB(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 halfHeight = yHeight >> 1;
 	int halfWidth = yWidth >> 1;
diff --git a/graphics/yuv_to_rgb.h b/graphics/yuv_to_rgb.h
index 259ba09810..8e025042dc 100644
--- a/graphics/yuv_to_rgb.h
+++ b/graphics/yuv_to_rgb.h
@@ -23,6 +23,7 @@
 /**
  * @file
  * YUV to RGB conversion used in engines:
+ * - mohawk
  * - scumm (he)
  * - sword25
  */
@@ -36,6 +37,20 @@
 namespace Graphics {
 
 /**
+ * Convert a YUV444 image to an RGB surface
+ *
+ * @param dst     the destination surface
+ * @param ySrc    the source of the y component
+ * @param uSrc    the source of the u component
+ * @param vSrc    the source of the v component
+ * @param yWidth  the width of the y surface
+ * @param yHeight the height of the y surface
+ * @param yPitch  the pitch of the y surface
+ * @param uvPitch the pitch of the u and v surfaces
+ */
+void convertYUV444ToRGB(Graphics::Surface *dst, const byte *ySrc, const byte *uSrc, const byte *vSrc, int yWidth, int yHeight, int yPitch, int uvPitch);
+
+/**
  * Convert a YUV420 image to an RGB surface
  *
  * @param dst     the destination surface