--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/video/SDL_blendpoint.c	Sun Dec 21 17:39:41 2008 +0000
@@ -0,0 +1,256 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997-2009 Sam Lantinga
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+    Sam Lantinga
+    slouken@libsdl.org
+*/
+#include "SDL_config.h"
+
+#include "SDL_draw.h"
+
+static int
+SDL_BlendPoint_RGB555(SDL_Surface * dst, int x, int y, int blendMode, Uint8 r,
+                      Uint8 g, Uint8 b, Uint8 a)
+{
+    unsigned inva = 0xff - a;
+
+    switch (blendMode) {
+    case SDL_BLENDMODE_BLEND:
+        DRAW_SETPIXELXY_BLEND_RGB555(x, y);
+        break;
+    case SDL_BLENDMODE_ADD:
+        DRAW_SETPIXELXY_ADD_RGB555(x, y);
+        break;
+    case SDL_BLENDMODE_MOD:
+        DRAW_SETPIXELXY_MOD_RGB555(x, y);
+        break;
+    default:
+        DRAW_SETPIXELXY_RGB555(x, y);
+        break;
+    }
+    return 0;
+}
+
+static int
+SDL_BlendPoint_RGB565(SDL_Surface * dst, int x, int y, int blendMode, Uint8 r,
+                      Uint8 g, Uint8 b, Uint8 a)
+{
+    unsigned inva = 0xff - a;
+
+    switch (blendMode) {
+    case SDL_BLENDMODE_BLEND:
+        DRAW_SETPIXELXY_BLEND_RGB565(x, y);
+        break;
+    case SDL_BLENDMODE_ADD:
+        DRAW_SETPIXELXY_ADD_RGB565(x, y);
+        break;
+    case SDL_BLENDMODE_MOD:
+        DRAW_SETPIXELXY_MOD_RGB565(x, y);
+        break;
+    default:
+        DRAW_SETPIXELXY_RGB565(x, y);
+        break;
+    }
+    return 0;
+}
+
+static int
+SDL_BlendPoint_RGB888(SDL_Surface * dst, int x, int y, int blendMode, Uint8 r,
+                      Uint8 g, Uint8 b, Uint8 a)
+{
+    unsigned inva = 0xff - a;
+
+    switch (blendMode) {
+    case SDL_BLENDMODE_BLEND:
+        DRAW_SETPIXELXY_BLEND_RGB888(x, y);
+        break;
+    case SDL_BLENDMODE_ADD:
+        DRAW_SETPIXELXY_ADD_RGB888(x, y);
+        break;
+    case SDL_BLENDMODE_MOD:
+        DRAW_SETPIXELXY_MOD_RGB888(x, y);
+        break;
+    default:
+        DRAW_SETPIXELXY_RGB888(x, y);
+        break;
+    }
+    return 0;
+}
+
+static int
+SDL_BlendPoint_ARGB8888(SDL_Surface * dst, int x, int y, int blendMode,
+                        Uint8 r, Uint8 g, Uint8 b, Uint8 a)
+{
+    unsigned inva = 0xff - a;
+
+    switch (blendMode) {
+    case SDL_BLENDMODE_BLEND:
+        DRAW_SETPIXELXY_BLEND_ARGB8888(x, y);
+        break;
+    case SDL_BLENDMODE_ADD:
+        DRAW_SETPIXELXY_ADD_ARGB8888(x, y);
+        break;
+    case SDL_BLENDMODE_MOD:
+        DRAW_SETPIXELXY_MOD_ARGB8888(x, y);
+        break;
+    default:
+        DRAW_SETPIXELXY_ARGB8888(x, y);
+        break;
+    }
+    return 0;
+}
+
+static int
+SDL_BlendPoint_RGB(SDL_Surface * dst, int x, int y, int blendMode, Uint8 r,
+                   Uint8 g, Uint8 b, Uint8 a)
+{
+    SDL_PixelFormat *fmt = dst->format;
+    unsigned inva = 0xff - a;
+
+    switch (fmt->BytesPerPixel) {
+    case 2:
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            DRAW_SETPIXELXY2_BLEND_RGB(x, y);
+            break;
+        case SDL_BLENDMODE_ADD:
+            DRAW_SETPIXELXY2_ADD_RGB(x, y);
+            break;
+        case SDL_BLENDMODE_MOD:
+            DRAW_SETPIXELXY2_MOD_RGB(x, y);
+            break;
+        default:
+            DRAW_SETPIXELXY2_RGB(x, y);
+            break;
+        }
+        return 0;
+    case 4:
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            DRAW_SETPIXELXY4_BLEND_RGB(x, y);
+            break;
+        case SDL_BLENDMODE_ADD:
+            DRAW_SETPIXELXY4_ADD_RGB(x, y);
+            break;
+        case SDL_BLENDMODE_MOD:
+            DRAW_SETPIXELXY4_MOD_RGB(x, y);
+            break;
+        default:
+            DRAW_SETPIXELXY4_RGB(x, y);
+            break;
+        }
+        return 0;
+    default:
+        SDL_Unsupported();
+        return -1;
+    }
+}
+
+static int
+SDL_BlendPoint_RGBA(SDL_Surface * dst, int x, int y, int blendMode, Uint8 r,
+                    Uint8 g, Uint8 b, Uint8 a)
+{
+    SDL_PixelFormat *fmt = dst->format;
+    unsigned inva = 0xff - a;
+
+    switch (fmt->BytesPerPixel) {
+    case 4:
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            DRAW_SETPIXELXY4_BLEND_RGBA(x, y);
+            break;
+        case SDL_BLENDMODE_ADD:
+            DRAW_SETPIXELXY4_ADD_RGBA(x, y);
+            break;
+        case SDL_BLENDMODE_MOD:
+            DRAW_SETPIXELXY4_MOD_RGBA(x, y);
+            break;
+        default:
+            DRAW_SETPIXELXY4_RGBA(x, y);
+            break;
+        }
+        return 0;
+    default:
+        SDL_Unsupported();
+        return -1;
+    }
+}
+
+int
+SDL_BlendPoint(SDL_Surface * dst, int x, int y, int blendMode, Uint8 r,
+               Uint8 g, Uint8 b, Uint8 a)
+{
+    SDL_PixelFormat *fmt = dst->format;
+
+    /* This function doesn't work on surfaces < 8 bpp */
+    if (dst->format->BitsPerPixel < 8) {
+        SDL_SetError("SDL_BlendPoint(): Unsupported surface format");
+        return (-1);
+    }
+
+    /* Perform clipping */
+    if (x < dst->clip_rect.x || y < dst->clip_rect.y ||
+        x >= (dst->clip_rect.x + dst->clip_rect.w) ||
+        y >= (dst->clip_rect.y + dst->clip_rect.h)) {
+        return 0;
+    }
+
+    if ((blendMode == SDL_BLENDMODE_BLEND)
+        || (blendMode == SDL_BLENDMODE_ADD)) {
+        r = DRAW_MUL(r, a);
+        g = DRAW_MUL(g, a);
+        b = DRAW_MUL(b, a);
+    }
+
+    switch (fmt->BitsPerPixel) {
+    case 15:
+        switch (fmt->Rmask) {
+        case 0x7C00:
+            return SDL_BlendPoint_RGB555(dst, x, y, blendMode, r, g, b, a);
+        }
+        break;
+    case 16:
+        switch (fmt->Rmask) {
+        case 0xF800:
+            return SDL_BlendPoint_RGB565(dst, x, y, blendMode, r, g, b, a);
+        }
+        break;
+    case 32:
+        switch (fmt->Rmask) {
+        case 0x00FF0000:
+            if (!fmt->Amask) {
+                return SDL_BlendPoint_RGB888(dst, x, y, blendMode, r, g, b,
+                                             a);
+            } else {
+                return SDL_BlendPoint_ARGB8888(dst, x, y, blendMode, r, g, b,
+                                               a);
+            }
+            break;
+        }
+    default:
+        break;
+    }
+
+    if (!fmt->Amask) {
+        return SDL_BlendPoint_RGB(dst, x, y, blendMode, r, g, b, a);
+    } else {
+        return SDL_BlendPoint_RGBA(dst, x, y, blendMode, r, g, b, a);
+    }
+}
+
+/* vi: set ts=4 sw=4 expandtab: */