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1 /*
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2 * DMLib
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3 * -- Sprite / surface blitting function template
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4 * Programmed and designed by Matti 'ccr' Hamalainen
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5 * (C) Copyright 2011-2012 Tecnic Software productions (TNSP)
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6 */
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7
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8 int DM_SCALED_NAME (SDL_Surface *src,
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9 const int x0, const int y0,
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10 const int dwidth, const int dheight,
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11 SDL_Surface *dst)
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12 {
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13 int yc;
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14 DMFixedPoint32 xv, yv, dx, dy;
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15 DMQValue xr, yr;
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16
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17 #ifdef DM_SCALED_VARS
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18 DM_SCALED_VARS
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19 #endif
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20
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21 // Clip coordinates
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22 if (dmClipCoord(&xr, x0, src->w, dwidth,
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23 dst->clip_rect.x, dst->clip_rect.x + dst->clip_rect.w)
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24 ||
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25 dmClipCoord(&yr, y0, src->h, dheight,
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26 dst->clip_rect.y, dst->clip_rect.y + dst->clip_rect.h))
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27 return -1;
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28
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29 #ifdef DM_SCALED_INIT
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30 DM_SCALED_INIT
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31 #endif
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32
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33 // Calculate "final" initial source bitmap offsets
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34 FP_CONV(dy, yr.voffs);
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35 FP_MUL_R(yv, dy, yr.vdelta);
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36
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37 FP_CONV(dx, xr.voffs);
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38 FP_MUL_R(dx, dx, xr.vdelta);
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39
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40 // Take pitch into account
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41 const int xadd = xr.vadd - dst->clip_rect.w + dst->clip_rect.x + (dst->pitch / DM_SCALED_DST_BYTES);
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42
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43 // Blit scaled
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44 DM_SCALED_DST_TYPE * dp = ((DM_SCALED_DST_TYPE *) dst->pixels) + (yr.v0 * dst->pitch) / DM_SCALED_DST_BYTES + xr.v0;
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45 for (yc = yr.v0; yc < yr.v1; yc++)
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46 {
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47 const DM_SCALED_SRC_TYPE * sp = ((DM_SCALED_SRC_TYPE *) src->pixels) + (FP_GETH(yv) * src->pitch) / DM_SCALED_SRC_BYTES;
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48 int xc;
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49
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50 #ifdef DM_SCALED_INNER_INIT
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51 DM_SCALED_INNER_INIT
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52 #endif
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53
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54 for (xv.dw = dx.dw, xc = xr.v0; xc < xr.v1; xc++)
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55 {
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56 DM_SCALED_INNER
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57 FP_ADD(xv, xr.vdelta);
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58 }
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59 FP_ADD(yv, yr.vdelta);
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60 dp += xadd;
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61 }
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62
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63 #ifdef DM_SCALED_FINISH
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64 DM_SCALED_FINISH
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65 #endif
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66
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67 return 0;
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68 }
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69
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70
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71 #undef DM_SCALED_NAME
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72 #undef DM_SCALED_SRC_BYTES
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73 #undef DM_SCALED_DST_BYTES
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74 #undef DM_SCALED_SRC_TYPE
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75 #undef DM_SCALED_DST_TYPE
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76 #undef DM_SCALED_VARS
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77 #undef DM_SCALED_INIT
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78 #undef DM_SCALED_INNER_INIT
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79 #undef DM_SCALED_INNER
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80 #undef DM_SCALED_FINISH
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