--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/video/SDL_draw.h	Sun Dec 21 08:28:25 2008 +0000
@@ -0,0 +1,325 @@
+/*
+    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_blit.h"
+
+/* This code assumes that r, g, b, a are the source color,
+ * and in the blend and add case, the RGB values are premultiplied by a.
+ */
+
+#define DRAW_MUL(_a, _b) (((unsigned)(_a)*(_b))/255)
+
+#define DRAW_SETPIXEL(setpixel) \
+do { \
+    unsigned sr = r, sg = g, sb = b, sa = a; \
+    setpixel; \
+} while (0)
+
+#define DRAW_SETPIXEL_BLEND(getpixel, setpixel) \
+do { \
+    unsigned sr, sg, sb, sa; sa; \
+    getpixel; \
+    sr = DRAW_MUL(inva, sr) + r; \
+    sg = DRAW_MUL(inva, sg) + g; \
+    sb = DRAW_MUL(inva, sb) + b; \
+    setpixel; \
+} while (0)
+
+#define DRAW_SETPIXEL_ADD(getpixel, setpixel) \
+do { \
+    unsigned sr, sg, sb, sa; sa; \
+    getpixel; \
+    sr += r; if (sr > 0xff) sr = 0xff; \
+    sg += g; if (sg > 0xff) sg = 0xff; \
+    sb += b; if (sb > 0xff) sb = 0xff; \
+    setpixel; \
+} while (0)
+
+#define DRAW_SETPIXEL_MOD(getpixel, setpixel) \
+do { \
+    unsigned sr, sg, sb, sa; sa; \
+    getpixel; \
+    sr = DRAW_MUL(sr, r); \
+    sg = DRAW_MUL(sg, g); \
+    sb = DRAW_MUL(sb, b); \
+    setpixel; \
+} while (0)
+
+#define DRAW_SETPIXELXY(x, y, type, bpp, op) \
+do { \
+    type *pixel = (type *)(dst->pixels + y * dst->pitch + x * bpp); \
+    op; \
+} while (0)
+
+/*
+ * Define draw operators for RGB555
+ */
+
+#define DRAW_SETPIXEL_RGB555 \
+    DRAW_SETPIXEL(RGB555_FROM_RGB(*pixel, sr, sg, sb))
+
+#define DRAW_SETPIXEL_BLEND_RGB555 \
+    DRAW_SETPIXEL_BLEND(RGB_FROM_RGB555(*pixel, sr, sg, sb), \
+                        RGB555_FROM_RGB(*pixel, sr, sg, sb))
+
+#define DRAW_SETPIXEL_ADD_RGB555 \
+    DRAW_SETPIXEL_ADD(RGB_FROM_RGB555(*pixel, sr, sg, sb), \
+                      RGB555_FROM_RGB(*pixel, sr, sg, sb))
+
+#define DRAW_SETPIXEL_MOD_RGB555 \
+    DRAW_SETPIXEL_MOD(RGB_FROM_RGB555(*pixel, sr, sg, sb), \
+                      RGB555_FROM_RGB(*pixel, sr, sg, sb))
+
+#define DRAW_SETPIXELXY_RGB555(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_RGB555)
+
+#define DRAW_SETPIXELXY_BLEND_RGB555(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_BLEND_RGB555)
+
+#define DRAW_SETPIXELXY_ADD_RGB555(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_ADD_RGB555)
+
+#define DRAW_SETPIXELXY_MOD_RGB555(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_MOD_RGB555)
+
+/*
+ * Define draw operators for RGB565
+ */
+
+#define DRAW_SETPIXEL_RGB565 \
+    DRAW_SETPIXEL(RGB565_FROM_RGB(*pixel, sr, sg, sb))
+
+#define DRAW_SETPIXEL_BLEND_RGB565 \
+    DRAW_SETPIXEL_BLEND(RGB_FROM_RGB565(*pixel, sr, sg, sb), \
+                        RGB565_FROM_RGB(*pixel, sr, sg, sb))
+
+#define DRAW_SETPIXEL_ADD_RGB565 \
+    DRAW_SETPIXEL_ADD(RGB_FROM_RGB565(*pixel, sr, sg, sb), \
+                      RGB565_FROM_RGB(*pixel, sr, sg, sb))
+
+#define DRAW_SETPIXEL_MOD_RGB565 \
+    DRAW_SETPIXEL_MOD(RGB_FROM_RGB565(*pixel, sr, sg, sb), \
+                      RGB565_FROM_RGB(*pixel, sr, sg, sb))
+
+#define DRAW_SETPIXELXY_RGB565(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_RGB565)
+
+#define DRAW_SETPIXELXY_BLEND_RGB565(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_BLEND_RGB565)
+
+#define DRAW_SETPIXELXY_ADD_RGB565(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_ADD_RGB565)
+
+#define DRAW_SETPIXELXY_MOD_RGB565(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_MOD_RGB565)
+
+/*
+ * Define draw operators for RGB888
+ */
+
+#define DRAW_SETPIXEL_RGB888 \
+    DRAW_SETPIXEL(RGB888_FROM_RGB(*pixel, sr, sg, sb))
+
+#define DRAW_SETPIXEL_BLEND_RGB888 \
+    DRAW_SETPIXEL_BLEND(RGB_FROM_RGB888(*pixel, sr, sg, sb), \
+                        RGB888_FROM_RGB(*pixel, sr, sg, sb))
+
+#define DRAW_SETPIXEL_ADD_RGB888 \
+    DRAW_SETPIXEL_ADD(RGB_FROM_RGB888(*pixel, sr, sg, sb), \
+                      RGB888_FROM_RGB(*pixel, sr, sg, sb))
+
+#define DRAW_SETPIXEL_MOD_RGB888 \
+    DRAW_SETPIXEL_MOD(RGB_FROM_RGB888(*pixel, sr, sg, sb), \
+                      RGB888_FROM_RGB(*pixel, sr, sg, sb))
+
+#define DRAW_SETPIXELXY_RGB888(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_RGB888)
+
+#define DRAW_SETPIXELXY_BLEND_RGB888(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_RGB888)
+
+#define DRAW_SETPIXELXY_ADD_RGB888(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_RGB888)
+
+#define DRAW_SETPIXELXY_MOD_RGB888(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_RGB888)
+
+/*
+ * Define draw operators for general RGB
+ */
+
+#define DRAW_SETPIXEL_RGB \
+    DRAW_SETPIXEL(PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
+
+#define DRAW_SETPIXEL_BLEND_RGB \
+    DRAW_SETPIXEL_BLEND(RGB_FROM_PIXEL(*pixel, fmt, sr, sg, sb), \
+                        PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
+
+#define DRAW_SETPIXEL_ADD_RGB \
+    DRAW_SETPIXEL_ADD(RGB_FROM_PIXEL(*pixel, fmt, sr, sg, sb), \
+                      PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
+
+#define DRAW_SETPIXEL_MOD_RGB \
+    DRAW_SETPIXEL_MOD(RGB_FROM_PIXEL(*pixel, fmt, sr, sg, sb), \
+                      PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
+
+#define DRAW_SETPIXELXY2_RGB(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_RGB)
+
+#define DRAW_SETPIXELXY4_RGB(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_RGB)
+
+#define DRAW_SETPIXELXY2_BLEND_RGB(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_BLEND_RGB)
+
+#define DRAW_SETPIXELXY4_BLEND_RGB(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_RGB)
+
+#define DRAW_SETPIXELXY2_ADD_RGB(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_ADD_RGB)
+
+#define DRAW_SETPIXELXY4_ADD_RGB(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_RGB)
+
+#define DRAW_SETPIXELXY2_MOD_RGB(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_MOD_RGB)
+
+#define DRAW_SETPIXELXY4_MOD_RGB(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_RGB)
+
+
+/*
+ * Define draw operators for general RGBA
+ */
+
+#define DRAW_SETPIXEL_RGBA \
+    DRAW_SETPIXEL(PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
+
+#define DRAW_SETPIXEL_BLEND_RGBA \
+    DRAW_SETPIXEL_BLEND(RGBA_FROM_PIXEL(*pixel, fmt, sr, sg, sb, sa), \
+                        PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
+
+#define DRAW_SETPIXEL_ADD_RGBA \
+    DRAW_SETPIXEL_ADD(RGBA_FROM_PIXEL(*pixel, fmt, sr, sg, sb, sa), \
+                      PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
+
+#define DRAW_SETPIXEL_MOD_RGBA \
+    DRAW_SETPIXEL_MOD(RGBA_FROM_PIXEL(*pixel, fmt, sr, sg, sb, sa), \
+                      PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
+
+#define DRAW_SETPIXELXY4_RGBA(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_RGBA)
+
+#define DRAW_SETPIXELXY4_BLEND_RGBA(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_RGBA)
+
+#define DRAW_SETPIXELXY4_ADD_RGBA(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_RGBA)
+
+#define DRAW_SETPIXELXY4_MOD_RGBA(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_RGBA)
+
+/*
+ * Define line drawing macro
+ */
+
+#define ABS(_x) ((_x) < 0 ? -(_x) : (_x))
+
+#define SWAP(_x, _y) do { int tmp; tmp = _x; _x = _y; _y = tmp; } while (0)
+
+#define BRESENHAM(x0, y0, x1, y1, op) \
+{ \
+    int deltax, deltay, steep, error, xstep, ystep, x, y; \
+ \
+    deltax = ABS(x1 - x0); \
+    deltay = ABS(y1 - y0); \
+    steep = (deltay > deltax); \
+    if (steep) { \
+        SWAP(x0, y0); \
+        SWAP(x1, y1); \
+        SWAP(deltax, deltay); \
+    } \
+    error = (x1 - x0) / 2; \
+    y = y0; \
+    if (x0 > x1) { \
+        xstep = -1; \
+    } else { \
+        xstep = 1; \
+    } \
+    if (y0 < y1) { \
+        ystep = 1; \
+    } else { \
+        ystep = -1; \
+    } \
+    if (!steep) { \
+        for (x = x0; x != x1; x += xstep) { \
+            op(x, y); \
+            error -= deltay; \
+            if (error < 0) { \
+                y += ystep; \
+                error += deltax; \
+            } \
+        } \
+    } else { \
+        for (x = x0; x != x1; x += xstep) { \
+            op(y, x); \
+            error -= deltay; \
+            if (error < 0) { \
+                y += ystep; \
+                error += deltax; \
+            } \
+        } \
+    } \
+}
+
+/*
+ * Define blend fill macro
+ */
+
+#define BLENDRECT(type, op) \
+do { \
+    int w; \
+    int width = dstrect->w; \
+    int height = dstrect->h; \
+    int pitch = (dst->pitch / dst->format->BytesPerPixel); \
+    int skip = pitch - width; \
+    type *pixel = (type *)dst->pixels + dstrect->y * pitch + dstrect->x; \
+    while (height--) { \
+        { int n = (width+3)/4; \
+            switch (width & 3) { \
+            case 0: do {   op; pixel++; \
+            case 3:        op; pixel++; \
+            case 2:        op; pixel++; \
+            case 1:        op; pixel++; \
+                    } while ( --n > 0 ); \
+            } \
+        } \
+        pixel += skip; \
+    } \
+} while (0)
+
+/*
+ * Define blend line macro
+ */
+
+/* vi: set ts=4 sw=4 expandtab: */