X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;f=Usermode%2FApplications%2Faxwin2_src%2FWM%2Fcommon.h;h=ff60f8c609f249d1dcfc582cae8d2bf42b51c0ec;hb=43992cf707ec82f8ffd3a1500ad5952640335a6d;hp=7a455eed00b115b82a60e6dd6f33cc7ef43e4ea1;hpb=92517b68b7582251f69db7e062d5e5a4c773791f;p=tpg%2Facess2.git

diff --git a/Usermode/Applications/axwin2_src/WM/common.h b/Usermode/Applications/axwin2_src/WM/common.h
index 7a455eed..ff60f8c6 100644
--- 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;