/* 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_FASTSETPIXEL(x, y, type, bpp, color) \ *(type *)((Uint8 *)dst->pixels + y * dst->pitch + x * bpp) = (type) color #define DRAW_FASTSETPIXEL1(x, y) DRAW_FASTSETPIXEL(x, y, Uint8, 1, color); #define DRAW_FASTSETPIXEL2(x, y) DRAW_FASTSETPIXEL(x, y, Uint16, 2, color); #define DRAW_FASTSETPIXEL4(x, y) DRAW_FASTSETPIXEL(x, y, Uint32, 4, color); #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 *)((Uint8 *)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 ARGB8888 */ #define DRAW_SETPIXEL_ARGB8888 \ DRAW_SETPIXEL(ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa)) #define DRAW_SETPIXEL_BLEND_ARGB8888 \ DRAW_SETPIXEL_BLEND(RGBA_FROM_ARGB8888(*pixel, sr, sg, sb, sa), \ ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa)) #define DRAW_SETPIXEL_ADD_ARGB8888 \ DRAW_SETPIXEL_ADD(RGBA_FROM_ARGB8888(*pixel, sr, sg, sb, sa), \ ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa)) #define DRAW_SETPIXEL_MOD_ARGB8888 \ DRAW_SETPIXEL_MOD(RGBA_FROM_ARGB8888(*pixel, sr, sg, sb, sa), \ ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa)) #define DRAW_SETPIXELXY_ARGB8888(x, y) \ DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ARGB8888) #define DRAW_SETPIXELXY_BLEND_ARGB8888(x, y) \ DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_ARGB8888) #define DRAW_SETPIXELXY_ADD_ARGB8888(x, y) \ DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_ARGB8888) #define DRAW_SETPIXELXY_MOD_ARGB8888(x, y) \ DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_ARGB8888) /* * 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 BRESENHAM(x1, y1, x2, y2, op) \ { \ int i, deltax, deltay, numpixels; \ int d, dinc1, dinc2; \ int x, xinc1, xinc2; \ int y, yinc1, yinc2; \ \ deltax = ABS(x2 - x1); \ deltay = ABS(y2 - y1); \ \ if (deltax >= deltay) { \ numpixels = deltax + 1; \ d = (2 * deltay) - deltax; \ dinc1 = deltay * 2; \ dinc2 = (deltay - deltax) * 2; \ xinc1 = 1; \ xinc2 = 1; \ yinc1 = 0; \ yinc2 = 1; \ } else { \ numpixels = deltay + 1; \ d = (2 * deltax) - deltay; \ dinc1 = deltax * 2; \ dinc2 = (deltax - deltay) * 2; \ xinc1 = 0; \ xinc2 = 1; \ yinc1 = 1; \ yinc2 = 1; \ } \ \ if (x1 > x2) { \ xinc1 = -xinc1; \ xinc2 = -xinc2; \ } \ if (y1 > y2) { \ yinc1 = -yinc1; \ yinc2 = -yinc2; \ } \ \ x = x1; \ y = y1; \ \ for (i = 0; i < numpixels; ++i) { \ op(x, y); \ if (d < 0) { \ d += dinc1; \ x += xinc1; \ y += yinc1; \ } else { \ d += dinc2; \ x += xinc2; \ y += yinc2; \ } \ } \ } #define DRAWLINE(x0, y0, x1, y1, op) BRESENHAM(x0, y0, x1, y1, op) /* * Define blend fill macro */ #define FILLRECT(type, op) \ do { \ int width = rect->w; \ int height = rect->h; \ int pitch = (dst->pitch / dst->format->BytesPerPixel); \ int skip = pitch - width; \ type *pixel = (type *)dst->pixels + rect->y * pitch + rect->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: */