Mercurial > sdl-ios-xcode
view src/video/SDL_drawline.c @ 3550:6b69c5def097
Minor documentation fix
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sat, 12 Dec 2009 20:30:25 +0000 |
parents | 0267b8b1595c |
children | c8bed77b0386 |
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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_draw.h" int SDL_DrawLine(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color) { 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_DrawLine(): Unsupported surface format"); return -1; } /* Perform clipping */ /* FIXME: We don't actually want to clip, as it may change line slope */ if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) { return (0); } switch (dst->format->BytesPerPixel) { case 1: DRAWLINE(x1, y1, x2, y2, DRAW_FASTSETPIXEL1); break; case 2: DRAWLINE(x1, y1, x2, y2, DRAW_FASTSETPIXEL2); break; case 3: SDL_Unsupported(); return -1; case 4: DRAWLINE(x1, y1, x2, y2, DRAW_FASTSETPIXEL4); break; } return 0; } int SDL_DrawLines(SDL_Surface * dst, const SDL_Point * points, int count, Uint32 color) { int i; 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_DrawLine(): Unsupported surface format"); return -1; } if (count < 2) { return 0; } for (i = 1; i < count; ++i) { int x1 = points[i-1].x; int y1 = points[i-1].y; int x2 = points[i].x; int y2 = points[i].y; /* Perform clipping */ /* FIXME: We don't actually want to clip, as it may change line slope */ if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) { continue; } switch (dst->format->BytesPerPixel) { case 1: DRAWLINE(x1, y1, x2, y2, DRAW_FASTSETPIXEL1); break; case 2: DRAWLINE(x1, y1, x2, y2, DRAW_FASTSETPIXEL2); break; case 3: SDL_Unsupported(); return -1; case 4: DRAWLINE(x1, y1, x2, y2, DRAW_FASTSETPIXEL4); break; } } return 0; } /* vi: set ts=4 sw=4 expandtab: */