Cleaning up (committing stuff)

[tpg/acess2.git] / Usermode / Applications / axwin2_src / WM / common.h

diff --git a/Usermode/Applications/axwin2_src/WM/common.h b/Usermode/Applications/axwin2_src/WM/common.h
index 7a455ee..ff60f8c 100644 (file)
--- a/Usermode/Applications/axwin2_src/WM/common.h
+++ b/Usermode/Applications/axwin2_src/WM/common.h
@@ -15,6 +15,44 @@
 
 typedef struct sFont   tFont;
 
+// === MACROS ===
+static inline uint32_t Video_AlphaBlend(uint32_t _orig, uint32_t _new, uint8_t _alpha)
+{
+        int    ao,ro,go,bo;
+        int    an,rn,gn,bn;
+       if( _alpha == 0 )       return _orig;
+       if( _alpha == 255 )     return _new;
+       
+       ao = (_orig >> 24) & 0xFF;
+       ro = (_orig >> 16) & 0xFF;
+       go = (_orig >>  8) & 0xFF;
+       bo = (_orig >>  0) & 0xFF;
+       
+       an = (_new >> 24) & 0xFF;
+       rn = (_new >> 16) & 0xFF;
+       gn = (_new >>  8) & 0xFF;
+       bn = (_new >>  0) & 0xFF;
+
+       if( _alpha == 0x80 ) {
+               ao = (ao + an) / 2;
+               ro = (ro + rn) / 2;
+               go = (go + gn) / 2;
+               bo = (bo + bn) / 2;
+       }
+       else {
+               ao = ao*(255-_alpha) + an*_alpha;
+               ro = ro*(255-_alpha) + rn*_alpha;
+               go = go*(255-_alpha) + gn*_alpha;
+               bo = bo*(255-_alpha) + bn*_alpha;
+               ao /= 255*2;
+               ro /= 255*2;
+               go /= 255*2;
+               bo /= 255*2;
+       }
+
+       return (ao << 24) | (ro << 16) | (go << 8) | bo;
+}
+
 // === GLOBALS ===
 extern char    *gsTerminalDevice;
 extern char    *gsMouseDevice;