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annotate src/dmunscaledblit.h @ 2298:b5abfff07ca9

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Add new DMGrowBuf helper functions dmGrowBufCopyOffsSize() and dmGrowBufConstCopyOffsSize().
author Matti Hamalainen <ccr@tnsp.org>
date Thu, 04 Jul 2019 10:54:16 +0300
parents e06abfde6c39
children
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1 /*
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2 * DMLib
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3 * -- Unscaled sprite / surface blitting function template
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4 * Programmed and designed by Matti 'ccr' Hamalainen
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5 * (C) Copyright 2012 Tecnic Software productions (TNSP)
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6 */
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7
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8 int DM_BLITFUNC_NAME (SDL_Surface *src,
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9 const int x0, const int y0,
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10 SDL_Surface *dst
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11 #ifdef DM_BLITFUNC_ARGS
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12 DM_BLITFUNC_ARGS
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13 #endif
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14 )
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15 #ifdef DM_HEADER
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16 ;
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17 #else
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18 {
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19 int yc;
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20 DMQValue xr, yr;
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21 #ifdef DM_BLITFUNC_VARS
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22 DM_BLITFUNC_VARS
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23 #endif
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24
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25 // Clip coordinates
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26 if (dmUnscaledClipCoord(&xr, x0, src->w,
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27 dst->clip_rect.x, dst->clip_rect.x + dst->clip_rect.w)
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28 ||
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29 dmUnscaledClipCoord(&yr, y0, src->h,
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30 dst->clip_rect.y, dst->clip_rect.y + dst->clip_rect.h))
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31 return -1;
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32
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33 #ifdef DM_BLITFUNC_INIT
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34 DM_BLITFUNC_INIT
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35 #endif
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36 const int srcadd = src->pitch / DM_BLITFUNC_SRC_BYTES;
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37 const int dstadd = xr.vadd - dst->clip_rect.w + dst->clip_rect.x + (dst->pitch / DM_BLITFUNC_DST_BYTES);
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38
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39 DM_BLITFUNC_SRC_TYPE * sp = ((DM_BLITFUNC_SRC_TYPE *) src->pixels) + (yr.voffs * src->pitch) / DM_BLITFUNC_SRC_BYTES;
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40 DM_BLITFUNC_DST_TYPE * dp = ((DM_BLITFUNC_DST_TYPE *) dst->pixels) + (yr.v0 * dst->pitch) / DM_BLITFUNC_DST_BYTES + xr.v0;
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41
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42 for (yc = yr.v0; yc < yr.v1; yc++)
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43 {
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44 int xv, xc;
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45
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46 #ifdef DM_BLITFUNC_INNER_INIT
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47 DM_BLITFUNC_INNER_INIT
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48 #endif
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49
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50 for (xv = xr.voffs, xc = xr.v0; xc < xr.v1; xc++, xv++)
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51 {
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52 DM_BLITFUNC_INNER
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53 }
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54 sp += srcadd;
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55 dp += dstadd;
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56 }
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57
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58 #ifdef DM_BLITFUNC_FINISH
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59 DM_BLITFUNC_FINISH
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60 #endif
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61 return 0;
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62 }
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63 #endif
95
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64
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65
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66 #undef DM_BLITFUNC_NAME
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67 #undef DM_BLITFUNC_ARGS
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68 #undef DM_BLITFUNC_SRC_BYTES
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69 #undef DM_BLITFUNC_DST_BYTES
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70 #undef DM_BLITFUNC_SRC_TYPE
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71 #undef DM_BLITFUNC_DST_TYPE
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72 #undef DM_BLITFUNC_VARS
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73 #undef DM_BLITFUNC_INIT
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74 #undef DM_BLITFUNC_INNER_INIT
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75 #undef DM_BLITFUNC_INNER
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76 #undef DM_BLITFUNC_FINISH