Mercurial > sdl-ios-xcode
diff src/video/SDL_drawline.c @ 3536:0267b8b1595c
Added interfaces for batch drawing of points, lines and rects:
SDL_DrawPoints()
SDL_BlendPoints()
SDL_BlendLines()
SDL_DrawLines()
SDL_FillRects()
SDL_BlendRects()
SDL_RenderPoints()
SDL_RenderLines()
SDL_RenderRects()
Renamed SDL_RenderFill() to SDL_RenderRect()
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Wed, 09 Dec 2009 15:56:56 +0000 |
parents | 27d8b12e0e8e |
children | c8bed77b0386 |
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--- a/src/video/SDL_drawline.c Mon Dec 07 10:08:24 2009 +0000 +++ b/src/video/SDL_drawline.c Wed Dec 09 15:56:56 2009 +0000 @@ -27,13 +27,19 @@ 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); + 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); } @@ -55,4 +61,55 @@ 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: */