1 files changed, 14 insertions, 0 deletions
diff --git a/backends/dc/dc.h b/backends/dc/dc.h
index 10f2c6c33b..42994c0012 100644
--- a/backends/dc/dc.h
+++ b/backends/dc/dc.h
@@ -133,6 +133,20 @@ class OSystem_Dreamcast : public OSystem {
   void clearOverlay();
   void grabOverlay(int16 *buf, int pitch);
   void copyRectToOverlay(const int16 *buf, int pitch, int x, int y, int w, int h);
+  bool hasAlpha() const { return true; }
+  OverlayColor RGBToColor(uint8 r, uint8 g, uint8 b) { return ARGBToColor(255, r, g, b); }
+  void colorToRGB(OverlayColor color, uint8 &r, uint8 &g, uint8 &b) {
+    uint8 tmp; colorToARGB(color, tmp, r, g, b);
+  }
+  OverlayColor ARGBToColor(uint8 a, uint8 r, uint8 g, uint8 b) {
+    return ((a&0xf0)<<8)|((r&0xf0)<<4)|(g&0xf0)|(b>>4);
+  }
+  void colorToARGB(OverlayColor color, uint8 &a, uint8 &r, uint8 &g, uint8 &b) {
+    a = ((color>>8)&0xf0)|((color>>12)&0x0f);
+    r = ((color>>4)&0xf0)|((color>>8)&0x0f);
+    g = (color&0xf0)|((color>>4)&0x0f);
+    b = ((color<<4)&0xf0)|(color&0x0f);
+  }
 
   // Add a callback timer
   void setTimerCallback(TimerProc callback, int timer);