--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/render/software/SDL_blendpoint.c	Thu Feb 03 02:45:29 2011 -0800
@@ -0,0 +1,325 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997-2010 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"
+#include "SDL_blendpoint.h"
+
+
+static int
+SDL_BlendPoint_RGB555(SDL_Surface * dst, int x, int y, SDL_BlendMode 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;
+    default:
+        DRAW_SETPIXELXY_RGB555(x, y);
+        break;
+    }
+    return 0;
+}
+
+static int
+SDL_BlendPoint_RGB565(SDL_Surface * dst, int x, int y, SDL_BlendMode 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;
+    default:
+        DRAW_SETPIXELXY_RGB565(x, y);
+        break;
+    }
+    return 0;
+}
+
+static int
+SDL_BlendPoint_RGB888(SDL_Surface * dst, int x, int y, SDL_BlendMode 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;
+    default:
+        DRAW_SETPIXELXY_RGB888(x, y);
+        break;
+    }
+    return 0;
+}
+
+static int
+SDL_BlendPoint_ARGB8888(SDL_Surface * dst, int x, int y, SDL_BlendMode 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;
+    default:
+        DRAW_SETPIXELXY_ARGB8888(x, y);
+        break;
+    }
+    return 0;
+}
+
+static int
+SDL_BlendPoint_RGB(SDL_Surface * dst, int x, int y, SDL_BlendMode 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;
+        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;
+        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, SDL_BlendMode 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;
+        default:
+            DRAW_SETPIXELXY4_RGBA(x, y);
+            break;
+        }
+        return 0;
+    default:
+        SDL_Unsupported();
+        return -1;
+    }
+}
+
+int
+SDL_BlendPoint(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r,
+               Uint8 g, Uint8 b, Uint8 a)
+{
+    if (!dst) {
+        SDL_SetError("Passed NULL destination surface");
+        return -1;
+    }
+
+    /* 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 (dst->format->BitsPerPixel) {
+    case 15:
+        switch (dst->format->Rmask) {
+        case 0x7C00:
+            return SDL_BlendPoint_RGB555(dst, x, y, blendMode, r, g, b, a);
+        }
+        break;
+    case 16:
+        switch (dst->format->Rmask) {
+        case 0xF800:
+            return SDL_BlendPoint_RGB565(dst, x, y, blendMode, r, g, b, a);
+        }
+        break;
+    case 32:
+        switch (dst->format->Rmask) {
+        case 0x00FF0000:
+            if (!dst->format->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;
+        }
+        break;
+    default:
+        break;
+    }
+
+    if (!dst->format->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);
+    }
+}
+
+int
+SDL_BlendPoints(SDL_Surface * dst, const SDL_Point * points, int count,
+                SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
+{
+    int minx, miny;
+    int maxx, maxy;
+    int i;
+    int x, y;
+    int (*func)(SDL_Surface * dst, int x, int y,
+                SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) = NULL;
+    int status = 0;
+
+    if (!dst) {
+        SDL_SetError("Passed NULL destination surface");
+        return -1;
+    }
+
+    /* This function doesn't work on surfaces < 8 bpp */
+    if (dst->format->BitsPerPixel < 8) {
+        SDL_SetError("SDL_BlendPoints(): Unsupported surface format");
+        return (-1);
+    }
+
+    if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
+        r = DRAW_MUL(r, a);
+        g = DRAW_MUL(g, a);
+        b = DRAW_MUL(b, a);
+    }
+
+    /* FIXME: Does this function pointer slow things down significantly? */
+    switch (dst->format->BitsPerPixel) {
+    case 15:
+        switch (dst->format->Rmask) {
+        case 0x7C00:
+            func = SDL_BlendPoint_RGB555;
+            break;
+        }
+        break;
+    case 16:
+        switch (dst->format->Rmask) {
+        case 0xF800:
+            func = SDL_BlendPoint_RGB565;
+            break;
+        }
+        break;
+    case 32:
+        switch (dst->format->Rmask) {
+        case 0x00FF0000:
+            if (!dst->format->Amask) {
+                func = SDL_BlendPoint_RGB888;
+            } else {
+                func = SDL_BlendPoint_ARGB8888;
+            }
+            break;
+        }
+        break;
+    default:
+        break;
+    }
+
+    if (!func) {
+        if (!dst->format->Amask) {
+            func = SDL_BlendPoint_RGB;
+        } else {
+            func = SDL_BlendPoint_RGBA;
+        }
+    }
+
+    minx = dst->clip_rect.x;
+    maxx = dst->clip_rect.x + dst->clip_rect.w - 1;
+    miny = dst->clip_rect.y;
+    maxy = dst->clip_rect.y + dst->clip_rect.h - 1;
+
+    for (i = 0; i < count; ++i) {
+        x = points[i].x;
+        y = points[i].y;
+
+        if (x < minx || x > maxx || y < miny || y > maxy) {
+            continue;
+        }
+        status = func(dst, x, y, blendMode, r, g, b, a);
+    }
+    return status;
+}
+
+/* vi: set ts=4 sw=4 expandtab: */