Index: scummvm/engines/scumm/gfx.cpp
===================================================================
--- scummvm/engines/scumm/gfx.cpp	(revisione 33992)
+++ scummvm/engines/scumm/gfx.cpp	(copia locale)
@@ -587,10 +587,10 @@
 		scale2x(dst, _screenWidth * m, src, vs->pitch,  width, height);
 		src = dst;
 
-		vsPitch = _screenWidth * m - width * m;
+		vsPitch = _screenWidth * m;
 
 	} else {
-		vsPitch = vs->pitch - width;
+		vsPitch = vs->pitch;
 	}
 
 	dst = _compositeBuf;
@@ -628,17 +628,32 @@
 #ifdef USE_ARM_GFX_ASM
 		asmDrawStripToScreen(height, width, text, src, dst, vs->pitch, width, _textSurface.pitch);
 #else
-		for (int h = 0; h < height * m; ++h) {
-			for (int w = 0; w < width * m; ++w) {
-				byte tmp = *text++;
-				if (tmp == CHARSET_MASK_TRANSPARENCY)
-					tmp = *src;
-				*dst++ = tmp;
-				src++;
-			}
-			src += vsPitch;
-			text += _textSurface.pitch - width * m;
-		}
+        int h = height * m;
+        int w = width * m;
+
+        if (h && w) {
+            text += w;
+            src  += w;
+            dst  += w;
+
+            w = 0-w;
+
+            do {
+                int ww = w;
+                do {
+                    uint32 temp = *(const uint32 *)(text + ww);
+                    uint32 mask = temp ^ CHARSET_MASK_TRANSPARENCY_32;
+                    
+                    mask = (((mask & 0x7f7f7f7f) + 0x7f7f7f7f) | mask) & 0x80808080;
+                    mask = ((mask >> 7) + 0x7f7f7f7f) ^ 0x80808080;
+                    
+                    *(uint32 *)(dst + ww) = ((temp ^ *(const uint32 *)(src + ww)) & mask) ^ temp;
+                } while ((ww+=4));
+
+                src += vsPitch;
+                text += _textSurface.pitch;
+            } while (--h);
+        }
 #endif
 		src = _compositeBuf;
 		pitch = width;
Index: scummvm/engines/scumm/gfx.h
===================================================================
--- scummvm/engines/scumm/gfx.h	(revisione 33992)
+++ scummvm/engines/scumm/gfx.h	(copia locale)
@@ -175,6 +175,11 @@
 struct StripTable;
 
 #define CHARSET_MASK_TRANSPARENCY	253
+#define CHARSET_MASK_TRANSPARENCY_32 \
+    (((CHARSET_MASK_TRANSPARENCY & 0xff)      ) | \
+     ((CHARSET_MASK_TRANSPARENCY & 0xff) <<  8) | \
+     ((CHARSET_MASK_TRANSPARENCY & 0xff) << 16) | \
+     ((CHARSET_MASK_TRANSPARENCY & 0xff) << 24))
 
 class Gdi {
 protected: