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SDL_draw.h
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/*
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: */