SCI: Make src param of GfxScreen::scale2x const

svn-id: r50420

2 files changed, 6 insertions, 4 deletions

diff --git a/engines/sci/graphics/screen.cpp b/engines/sci/graphics/screen.cpp
index ca8a8880b7..519020f3a1 100644
--- a/engines/sci/graphics/screen.cpp
+++ b/engines/sci/graphics/screen.cpp
@@ -583,9 +583,9 @@ void GfxScreen::debugShowMap(int mapNo) {
 	copyToScreen();
 }
 
-void GfxScreen::scale2x(byte *src, byte *dst, int16 srcWidth, int16 srcHeight) {
+void GfxScreen::scale2x(const byte *src, byte *dst, int16 srcWidth, int16 srcHeight) {
 	int newWidth = srcWidth * 2;
-	byte *srcPtr = src;
+	const byte *srcPtr = src;
 
 	for (int y = 0; y < srcHeight; y++) {
 		for (int x = 0; x < srcWidth; x++) {
diff --git a/engines/sci/graphics/screen.h b/engines/sci/graphics/screen.h
index d64c2541ec..c1e10fabc8 100644
--- a/engines/sci/graphics/screen.h
+++ b/engines/sci/graphics/screen.h
@@ -50,7 +50,9 @@ enum GfxScreenMasks {
 	GFX_SCREEN_MASK_ALL			= GFX_SCREEN_MASK_VISUAL|GFX_SCREEN_MASK_PRIORITY|GFX_SCREEN_MASK_CONTROL
 };
 
-#define SCI_SCREEN_UNDITHERMEMORIAL_SIZE 256
+enum {
+	SCI_SCREEN_UNDITHERMEMORIAL_SIZE = 256
+};
 
 /**
  * Screen class, actually creates 3 (4) screens internally - which is visual/display (for the user),
@@ -104,7 +106,7 @@ public:
 
 	void setVerticalShakePos(uint16 shakePos);
 
-	void scale2x(byte *src, byte *dst, int16 srcWidth, int16 srcHeight);
+	void scale2x(const byte *src, byte *dst, int16 srcWidth, int16 srcHeight);
 
 	void adjustToUpscaledCoordinates(int16 &y, int16 &x);