From 1ba19cde07949d7fdacfd31b48fd276495a94d7b Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Sun, 21 Dec 2008 08:55:06 +0000
Subject: [PATCH] Added ARGB optimized case for Mac OS X

---
 src/video/SDL_blendline.c | 26 ++++++++++++++++++++++++++
 src/video/SDL_blendrect.c | 26 ++++++++++++++++++++++++++
 src/video/SDL_blit.h      |  4 ++++
 src/video/SDL_draw.h      | 31 +++++++++++++++++++++++++++++++
 4 files changed, 87 insertions(+)

diff --git a/src/video/SDL_blendline.c b/src/video/SDL_blendline.c
index 5cf916c6d..e1c0358ea 100644
--- a/src/video/SDL_blendline.c
+++ b/src/video/SDL_blendline.c
@@ -92,6 +92,29 @@ SDL_BlendLine_RGB888(SDL_Surface * dst, int x1, int y1, int x2, int y2,
     return 0;
 }
 
+static int
+SDL_BlendLine_ARGB8888(SDL_Surface * dst, int x1, int y1, int x2, int y2,
+                       int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
+{
+    unsigned inva = 0xff - a;
+
+    switch (blendMode) {
+    case SDL_BLENDMODE_BLEND:
+        BRESENHAM(x1, y1, x2, y2, DRAW_SETPIXELXY_BLEND_ARGB8888);
+        break;
+    case SDL_BLENDMODE_ADD:
+        BRESENHAM(x1, y1, x2, y2, DRAW_SETPIXELXY_ADD_ARGB8888);
+        break;
+    case SDL_BLENDMODE_MOD:
+        BRESENHAM(x1, y1, x2, y2, DRAW_SETPIXELXY_MOD_ARGB8888);
+        break;
+    default:
+        BRESENHAM(x1, y1, x2, y2, DRAW_SETPIXELXY_ARGB8888);
+        break;
+    }
+    return 0;
+}
+
 static int
 SDL_BlendLine_RGB(SDL_Surface * dst, int x1, int y1, int x2, int y2,
                   int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
@@ -215,6 +238,9 @@ SDL_BlendLine(SDL_Surface * dst, int x1, int y1, int x2, int y2,
             if (!fmt->Amask) {
                 return SDL_BlendLine_RGB888(dst, x1, y1, x2, y2, blendMode, r,
                                             g, b, a);
+            } else {
+                return SDL_BlendLine_ARGB8888(dst, x1, y1, x2, y2, blendMode,
+                                              r, g, b, a);
             }
             break;
         }
diff --git a/src/video/SDL_blendrect.c b/src/video/SDL_blendrect.c
index 4ab2b716c..86d3e0443 100644
--- a/src/video/SDL_blendrect.c
+++ b/src/video/SDL_blendrect.c
@@ -93,6 +93,29 @@ SDL_BlendRect_RGB888(SDL_Surface * dst, SDL_Rect * dstrect, int blendMode,
     return 0;
 }
 
+static int
+SDL_BlendRect_ARGB8888(SDL_Surface * dst, SDL_Rect * dstrect, int blendMode,
+                       Uint8 r, Uint8 g, Uint8 b, Uint8 a)
+{
+    unsigned inva = 0xff - a;
+
+    switch (blendMode) {
+    case SDL_BLENDMODE_BLEND:
+        BLENDRECT(Uint32, DRAW_SETPIXEL_BLEND_ARGB8888);
+        break;
+    case SDL_BLENDMODE_ADD:
+        BLENDRECT(Uint32, DRAW_SETPIXEL_ADD_ARGB8888);
+        break;
+    case SDL_BLENDMODE_MOD:
+        BLENDRECT(Uint32, DRAW_SETPIXEL_MOD_ARGB8888);
+        break;
+    default:
+        BLENDRECT(Uint32, DRAW_SETPIXEL_ARGB8888);
+        break;
+    }
+    return 0;
+}
+
 static int
 SDL_BlendRect_RGB(SDL_Surface * dst, SDL_Rect * dstrect, int blendMode,
                   Uint8 r, Uint8 g, Uint8 b, Uint8 a)
@@ -217,6 +240,9 @@ SDL_BlendRect(SDL_Surface * dst, SDL_Rect * dstrect, int blendMode, Uint8 r,
             if (!fmt->Amask) {
                 return SDL_BlendRect_RGB888(dst, dstrect, blendMode, r, g, b,
                                             a);
+            } else {
+                return SDL_BlendRect_ARGB8888(dst, dstrect, blendMode, r, g,
+                                              b, a);
             }
             break;
         }
diff --git a/src/video/SDL_blit.h b/src/video/SDL_blit.h
index d1cc7d8a7..46e416403 100644
--- a/src/video/SDL_blit.h
+++ b/src/video/SDL_blit.h
@@ -236,6 +236,10 @@ do {									   \
 {									\
 	Pixel = (r<<16)|(g<<8)|b;					\
 }
+#define ARGB8888_FROM_RGBA(Pixel, r, g, b, a)				\
+{									\
+	Pixel = (a<<24)|(r<<16)|(g<<8)|b;				\
+}
 #define ASSEMBLE_RGB(buf, bpp, fmt, r, g, b) 				\
 {									\
 	switch (bpp) {							\
diff --git a/src/video/SDL_draw.h b/src/video/SDL_draw.h
index 05c56941a..29128fb56 100644
--- a/src/video/SDL_draw.h
+++ b/src/video/SDL_draw.h
@@ -164,6 +164,37 @@ do { \
 #define DRAW_SETPIXELXY_MOD_RGB888(x, y) \
     DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_RGB888)
 
+/*
+ * Define draw operators for ARGB8888
+ */
+
+#define DRAW_SETPIXEL_ARGB8888 \
+    DRAW_SETPIXEL(ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa))
+
+#define DRAW_SETPIXEL_BLEND_ARGB8888 \
+    DRAW_SETPIXEL_BLEND(RGBA_FROM_ARGB8888(*pixel, sr, sg, sb, sa), \
+                        ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa))
+
+#define DRAW_SETPIXEL_ADD_ARGB8888 \
+    DRAW_SETPIXEL_ADD(RGBA_FROM_ARGB8888(*pixel, sr, sg, sb, sa), \
+                      ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa))
+
+#define DRAW_SETPIXEL_MOD_ARGB8888 \
+    DRAW_SETPIXEL_MOD(RGBA_FROM_ARGB8888(*pixel, sr, sg, sb, sa), \
+                      ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa))
+
+#define DRAW_SETPIXELXY_ARGB8888(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ARGB8888)
+
+#define DRAW_SETPIXELXY_BLEND_ARGB8888(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_ARGB8888)
+
+#define DRAW_SETPIXELXY_ADD_ARGB8888(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_ARGB8888)
+
+#define DRAW_SETPIXELXY_MOD_ARGB8888(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_ARGB8888)
+
 /*
  * Define draw operators for general RGB
  */