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1 /*
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2 * DMLib
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3 * -- Arbitrary line drawing functions
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4 * Programmed and designed by Matti 'ccr' Hamalainen
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5 * (C) Copyright 2011 Tecnic Software productions (TNSP)
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6 */
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7 #include "dmlib.h"
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8
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9
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10 /* Clip line coordinates. Return value:
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11 * = 0 : No clipping needed.
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12 * > 0 : Clipped. Line partially inside the clipping area.
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13 * < 0 : Line completely outside the clipping area.
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14 */
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15 int dmClipLineCoords(int *x0, int *y0, int *x1, int *y1, SDL_Surface *screen)
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16 {
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17 #if 0
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18 const int clipX0 = screen->clip_rect.x,
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19 clipY0 = screen->clip_rect.y;
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20 const int clipX1 = clipX0 + screen->clip_rect.w - 1,
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21 clipY1 = clipY0 + screen->clip_rect.h - 1;
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22 const int dx = *x1 - *x0,
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23 dy = *y1 - *y0;
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24 DMFixedPoint k, kdx, kdy;
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25
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26 // Is line completely outside the clipping area?
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27 if ((*x0 < clipX0 && *x1 < clipX0) || (*x0 > clipX1 && *x1 > clipX1) ||
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28 (*y0 < clipY0 && *y1 < clipY0) || (*y0 > clipY1 && *y1 > clipY1))
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29 return -1;
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30
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31 FP_SETHL(kdx, dx);
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32 FP_SETHL(kdy, dy);
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33 #endif
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34
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35 return 0;
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36 }
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37
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38
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39 int dmTestLineCoords(int x0, int y0, int x1, int y1, SDL_Surface *screen)
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40 {
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41 return dmClipLineCoords(&x0, &y0, &x1, &y1, screen);
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42 }
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43
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44
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45 #include "dmlinefunc.h"
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46
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47 static const DMDrawLineFunc dmDrawLineTable[DMD_NMODES][DMD_NBITDEPTHS] =
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48 {
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49 /* DMD_NONE */ { dmDrawLine8 , dmDrawLine32 },
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50 /* DMD_TRANSPARENT */ { dmDrawLine8Transparent , dmDrawLine32Transparent },
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51 /* DMD_SATURATE */ { dmDrawLine8Saturate , dmDrawLine32Saturate },
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52 /* DMD_NONE + AA */ { NULL, NULL },
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53 /* DMD_TRANSP + AA */ { NULL, NULL },
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54 /* DMD_SATURATE + AA */ { dmDrawLine8AASaturate , dmDrawLine32AASaturate },
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55 };
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56
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57
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58 DMDrawLineFunc dmGetDrawLineFunc(SDL_PixelFormat *dst, int mode)
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59 {
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60 int index;
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61 if (dst == NULL || mode < 0 ||
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62 mode >= sizeof(dmDrawLineTable) / sizeof(dmDrawLineTable[0]))
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63 return NULL;
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64
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65 if ((index = dmBitsPerPixel2Index(src->BitsPerPixel)) < 0)
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66 return NULL;
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67
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68 return dmDrawLineTable[mode]
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69 }
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70
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71
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72 int dmDrawLineAny(SDL_Surface *screen, int x0, int y0, int x1, int y1, const Uint32 col, int mode)
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73 {
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74 DMDrawLineFunc bfunc = dmGetDrawLineFunc(screen->format, mode);
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75
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76 if (bfunc == NULL)
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77 return -15;
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78
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79 return bfunc(screen, x0, y0, x1, y1, col);
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80 }
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81
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