Mercurial > hg > dmlib
view dmline.c @ 0:32250b436bca
Initial re-import.
author | Matti Hamalainen <ccr@tnsp.org> |
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date | Fri, 28 Sep 2012 01:54:23 +0300 |
parents | |
children | 997e26f17946 |
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/* * DMLib * -- Arbitrary line drawing functions * Programmed and designed by Matti 'ccr' Hamalainen * (C) Copyright 2011 Tecnic Software productions (TNSP) */ #include "dmlib.h" /* Clip line coordinates. Return value: * = 0 : No clipping needed. * > 0 : Clipped. Line partially inside the clipping area. * < 0 : Line completely outside the clipping area. */ int dmClipLineCoords(int *x0, int *y0, int *x1, int *y1, SDL_Surface *screen) { #if 0 const int clipX0 = screen->clip_rect.x, clipY0 = screen->clip_rect.y; const int clipX1 = clipX0 + screen->clip_rect.w - 1, clipY1 = clipY0 + screen->clip_rect.h - 1; const int dx = *x1 - *x0, dy = *y1 - *y0; DMFixedPoint k, kdx, kdy; // Is line completely outside the clipping area? if ((*x0 < clipX0 && *x1 < clipX0) || (*x0 > clipX1 && *x1 > clipX1) || (*y0 < clipY0 && *y1 < clipY0) || (*y0 > clipY1 && *y1 > clipY1)) return -1; FP_SETHL(kdx, dx); FP_SETHL(kdy, dy); #endif return 0; } int dmTestLineCoords(int x0, int y0, int x1, int y1, SDL_Surface *screen) { return dmClipLineCoords(&x0, &y0, &x1, &y1, screen); } #include "dmlinefunc.h" static const DMDrawLineFunc dmDrawLineTable[DMD_NMODES][DMD_NBITDEPTHS] = { /* DMD_NONE */ { dmDrawLine8 , dmDrawLine32 }, /* DMD_TRANSPARENT */ { dmDrawLine8Transparent , dmDrawLine32Transparent }, /* DMD_SATURATE */ { dmDrawLine8Saturate , dmDrawLine32Saturate }, /* DMD_NONE + AA */ { NULL, NULL }, /* DMD_TRANSP + AA */ { NULL, NULL }, /* DMD_SATURATE + AA */ { dmDrawLine8AASaturate , dmDrawLine32AASaturate }, }; DMDrawLineFunc dmGetDrawLineFunc(SDL_PixelFormat *dst, int mode) { int index; if (dst == NULL || mode < 0 || mode >= sizeof(dmDrawLineTable) / sizeof(dmDrawLineTable[0])) return NULL; if ((index = dmBitsPerPixel2Index(src->BitsPerPixel)) < 0) return NULL; return dmDrawLineTable[mode] } int dmDrawLineAny(SDL_Surface *screen, int x0, int y0, int x1, int y1, const Uint32 col, int mode) { DMDrawLineFunc bfunc = dmGetDrawLineFunc(screen->format, mode); if (bfunc == NULL) return -15; return bfunc(screen, x0, y0, x1, y1, col); }