326 lines
9.4 KiB
C
326 lines
9.4 KiB
C
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/*
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SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2009 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Sam Lantinga
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slouken@libsdl.org
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*/
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#include "SDL_config.h"
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#include "SDL_blit.h"
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/* This code assumes that r, g, b, a are the source color,
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* and in the blend and add case, the RGB values are premultiplied by a.
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*/
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#define DRAW_MUL(_a, _b) (((unsigned)(_a)*(_b))/255)
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#define DRAW_SETPIXEL(setpixel) \
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do { \
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unsigned sr = r, sg = g, sb = b, sa = a; \
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setpixel; \
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} while (0)
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#define DRAW_SETPIXEL_BLEND(getpixel, setpixel) \
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do { \
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unsigned sr, sg, sb, sa; sa; \
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getpixel; \
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sr = DRAW_MUL(inva, sr) + r; \
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sg = DRAW_MUL(inva, sg) + g; \
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sb = DRAW_MUL(inva, sb) + b; \
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setpixel; \
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} while (0)
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#define DRAW_SETPIXEL_ADD(getpixel, setpixel) \
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do { \
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unsigned sr, sg, sb, sa; sa; \
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getpixel; \
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sr += r; if (sr > 0xff) sr = 0xff; \
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sg += g; if (sg > 0xff) sg = 0xff; \
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sb += b; if (sb > 0xff) sb = 0xff; \
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setpixel; \
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} while (0)
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#define DRAW_SETPIXEL_MOD(getpixel, setpixel) \
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do { \
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unsigned sr, sg, sb, sa; sa; \
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getpixel; \
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sr = DRAW_MUL(sr, r); \
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sg = DRAW_MUL(sg, g); \
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sb = DRAW_MUL(sb, b); \
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setpixel; \
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} while (0)
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#define DRAW_SETPIXELXY(x, y, type, bpp, op) \
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do { \
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type *pixel = (type *)(dst->pixels + y * dst->pitch + x * bpp); \
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op; \
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} while (0)
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/*
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* Define draw operators for RGB555
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*/
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#define DRAW_SETPIXEL_RGB555 \
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DRAW_SETPIXEL(RGB555_FROM_RGB(*pixel, sr, sg, sb))
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#define DRAW_SETPIXEL_BLEND_RGB555 \
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DRAW_SETPIXEL_BLEND(RGB_FROM_RGB555(*pixel, sr, sg, sb), \
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RGB555_FROM_RGB(*pixel, sr, sg, sb))
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#define DRAW_SETPIXEL_ADD_RGB555 \
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DRAW_SETPIXEL_ADD(RGB_FROM_RGB555(*pixel, sr, sg, sb), \
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RGB555_FROM_RGB(*pixel, sr, sg, sb))
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#define DRAW_SETPIXEL_MOD_RGB555 \
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DRAW_SETPIXEL_MOD(RGB_FROM_RGB555(*pixel, sr, sg, sb), \
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RGB555_FROM_RGB(*pixel, sr, sg, sb))
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#define DRAW_SETPIXELXY_RGB555(x, y) \
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DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_RGB555)
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#define DRAW_SETPIXELXY_BLEND_RGB555(x, y) \
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DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_BLEND_RGB555)
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#define DRAW_SETPIXELXY_ADD_RGB555(x, y) \
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DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_ADD_RGB555)
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#define DRAW_SETPIXELXY_MOD_RGB555(x, y) \
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DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_MOD_RGB555)
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/*
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* Define draw operators for RGB565
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*/
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#define DRAW_SETPIXEL_RGB565 \
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DRAW_SETPIXEL(RGB565_FROM_RGB(*pixel, sr, sg, sb))
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#define DRAW_SETPIXEL_BLEND_RGB565 \
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DRAW_SETPIXEL_BLEND(RGB_FROM_RGB565(*pixel, sr, sg, sb), \
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RGB565_FROM_RGB(*pixel, sr, sg, sb))
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#define DRAW_SETPIXEL_ADD_RGB565 \
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DRAW_SETPIXEL_ADD(RGB_FROM_RGB565(*pixel, sr, sg, sb), \
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RGB565_FROM_RGB(*pixel, sr, sg, sb))
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#define DRAW_SETPIXEL_MOD_RGB565 \
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DRAW_SETPIXEL_MOD(RGB_FROM_RGB565(*pixel, sr, sg, sb), \
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RGB565_FROM_RGB(*pixel, sr, sg, sb))
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#define DRAW_SETPIXELXY_RGB565(x, y) \
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DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_RGB565)
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#define DRAW_SETPIXELXY_BLEND_RGB565(x, y) \
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DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_BLEND_RGB565)
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#define DRAW_SETPIXELXY_ADD_RGB565(x, y) \
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DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_ADD_RGB565)
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#define DRAW_SETPIXELXY_MOD_RGB565(x, y) \
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DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_MOD_RGB565)
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/*
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* Define draw operators for RGB888
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*/
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#define DRAW_SETPIXEL_RGB888 \
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DRAW_SETPIXEL(RGB888_FROM_RGB(*pixel, sr, sg, sb))
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#define DRAW_SETPIXEL_BLEND_RGB888 \
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DRAW_SETPIXEL_BLEND(RGB_FROM_RGB888(*pixel, sr, sg, sb), \
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RGB888_FROM_RGB(*pixel, sr, sg, sb))
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#define DRAW_SETPIXEL_ADD_RGB888 \
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DRAW_SETPIXEL_ADD(RGB_FROM_RGB888(*pixel, sr, sg, sb), \
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RGB888_FROM_RGB(*pixel, sr, sg, sb))
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#define DRAW_SETPIXEL_MOD_RGB888 \
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DRAW_SETPIXEL_MOD(RGB_FROM_RGB888(*pixel, sr, sg, sb), \
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RGB888_FROM_RGB(*pixel, sr, sg, sb))
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#define DRAW_SETPIXELXY_RGB888(x, y) \
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DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_RGB888)
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#define DRAW_SETPIXELXY_BLEND_RGB888(x, y) \
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DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_RGB888)
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#define DRAW_SETPIXELXY_ADD_RGB888(x, y) \
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DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_RGB888)
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#define DRAW_SETPIXELXY_MOD_RGB888(x, y) \
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DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_RGB888)
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/*
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* Define draw operators for general RGB
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*/
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#define DRAW_SETPIXEL_RGB \
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DRAW_SETPIXEL(PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
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#define DRAW_SETPIXEL_BLEND_RGB \
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DRAW_SETPIXEL_BLEND(RGB_FROM_PIXEL(*pixel, fmt, sr, sg, sb), \
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PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
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#define DRAW_SETPIXEL_ADD_RGB \
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DRAW_SETPIXEL_ADD(RGB_FROM_PIXEL(*pixel, fmt, sr, sg, sb), \
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PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
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#define DRAW_SETPIXEL_MOD_RGB \
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DRAW_SETPIXEL_MOD(RGB_FROM_PIXEL(*pixel, fmt, sr, sg, sb), \
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PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
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#define DRAW_SETPIXELXY2_RGB(x, y) \
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DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_RGB)
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#define DRAW_SETPIXELXY4_RGB(x, y) \
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DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_RGB)
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#define DRAW_SETPIXELXY2_BLEND_RGB(x, y) \
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DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_BLEND_RGB)
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#define DRAW_SETPIXELXY4_BLEND_RGB(x, y) \
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DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_RGB)
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#define DRAW_SETPIXELXY2_ADD_RGB(x, y) \
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DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_ADD_RGB)
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#define DRAW_SETPIXELXY4_ADD_RGB(x, y) \
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DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_RGB)
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#define DRAW_SETPIXELXY2_MOD_RGB(x, y) \
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DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_MOD_RGB)
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#define DRAW_SETPIXELXY4_MOD_RGB(x, y) \
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DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_RGB)
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/*
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* Define draw operators for general RGBA
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*/
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#define DRAW_SETPIXEL_RGBA \
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DRAW_SETPIXEL(PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
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#define DRAW_SETPIXEL_BLEND_RGBA \
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DRAW_SETPIXEL_BLEND(RGBA_FROM_PIXEL(*pixel, fmt, sr, sg, sb, sa), \
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PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
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#define DRAW_SETPIXEL_ADD_RGBA \
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DRAW_SETPIXEL_ADD(RGBA_FROM_PIXEL(*pixel, fmt, sr, sg, sb, sa), \
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PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
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#define DRAW_SETPIXEL_MOD_RGBA \
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DRAW_SETPIXEL_MOD(RGBA_FROM_PIXEL(*pixel, fmt, sr, sg, sb, sa), \
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PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
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#define DRAW_SETPIXELXY4_RGBA(x, y) \
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DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_RGBA)
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#define DRAW_SETPIXELXY4_BLEND_RGBA(x, y) \
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DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_RGBA)
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#define DRAW_SETPIXELXY4_ADD_RGBA(x, y) \
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DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_RGBA)
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#define DRAW_SETPIXELXY4_MOD_RGBA(x, y) \
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DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_RGBA)
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/*
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* Define line drawing macro
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*/
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#define ABS(_x) ((_x) < 0 ? -(_x) : (_x))
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#define SWAP(_x, _y) do { int tmp; tmp = _x; _x = _y; _y = tmp; } while (0)
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#define BRESENHAM(x0, y0, x1, y1, op) \
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{ \
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int deltax, deltay, steep, error, xstep, ystep, x, y; \
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\
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deltax = ABS(x1 - x0); \
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deltay = ABS(y1 - y0); \
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steep = (deltay > deltax); \
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if (steep) { \
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SWAP(x0, y0); \
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SWAP(x1, y1); \
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SWAP(deltax, deltay); \
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} \
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error = (x1 - x0) / 2; \
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y = y0; \
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if (x0 > x1) { \
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xstep = -1; \
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} else { \
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xstep = 1; \
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} \
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if (y0 < y1) { \
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ystep = 1; \
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} else { \
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ystep = -1; \
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} \
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if (!steep) { \
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for (x = x0; x != x1; x += xstep) { \
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op(x, y); \
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error -= deltay; \
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if (error < 0) { \
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y += ystep; \
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error += deltax; \
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} \
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} \
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} else { \
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for (x = x0; x != x1; x += xstep) { \
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op(y, x); \
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error -= deltay; \
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if (error < 0) { \
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y += ystep; \
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error += deltax; \
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} \
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} \
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} \
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}
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/*
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* Define blend fill macro
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*/
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#define BLENDRECT(type, op) \
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do { \
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int w; \
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int width = dstrect->w; \
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int height = dstrect->h; \
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int pitch = (dst->pitch / dst->format->BytesPerPixel); \
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int skip = pitch - width; \
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type *pixel = (type *)dst->pixels + dstrect->y * pitch + dstrect->x; \
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while (height--) { \
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{ int n = (width+3)/4; \
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switch (width & 3) { \
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case 0: do { op; pixel++; \
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case 3: op; pixel++; \
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case 2: op; pixel++; \
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case 1: op; pixel++; \
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} while ( --n > 0 ); \
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} \
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} \
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pixel += skip; \
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} \
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} while (0)
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/*
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* Define blend line macro
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*/
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/* vi: set ts=4 sw=4 expandtab: */
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