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1 /*
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2 * DMLib
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3 * -- Sprite / surface blitting 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 //#define DM_CLIP_DEBUG
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10
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11 typedef struct
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12 {
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13 int v0, v1, voffs, vadd;
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14 DMFixedPoint32 vdelta;
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15 } DMQValue;
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16
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17
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18 int dmClipCoord(DMQValue *pv, int v0, int v1, int v2, int clipMin, int clipMax)
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19 {
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20 DMFixedPoint32 a, b;
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21
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22 // Basic bounds check
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23 if (v1 < 1 || v2 < 1 || v0 + v2 < clipMin || v0 >= clipMax)
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24 {
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25 #ifdef DM_CLIPDEBUG
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26 printf("out of bounds\n");
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27 #endif
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28 return -1;
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29 }
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30
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31 // Calculate delta
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32 FP_SETHL(a, v1, 0);
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33 FP_CONV(b, v2);
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34 FP_DIV_R(pv->vdelta, a, b);
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35
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36 // Perform clipping
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37 if (v0 + v2 >= clipMax)
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38 {
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39 pv->vadd = v0;
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40 pv->v1 = clipMax;
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41 }
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42 else
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43 {
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44 pv->vadd = clipMax - v2;
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45 pv->v1 = v0 + v2;
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46 }
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47
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48 if (v0 < clipMin)
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49 {
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50 pv->voffs = clipMin - v0;
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51 pv->v0 = clipMin;
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52 pv->vadd -= v0 + clipMin;
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53 }
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54 else
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55 {
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56 pv->voffs = 0;
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57 pv->v0 = v0;
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58 }
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59
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60 #ifdef DM_CLIP_DEBUG
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61 printf("dmClipCoord(%d, (%d, %d), [%d, %d]): vdelta=",
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62 v0, v1, v2, clipMin, clipMax);
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63 FP_PRINTF(pv->vdelta);
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64 printf(", v0=%d, v1=%d, voffs=%d, vadd=%d\n",
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65 pv->v0, pv->v1, pv->voffs, pv->vadd);
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66 #endif
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67
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68 return 0;
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69 }
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70
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71 #include "dmblitfunc.h"
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72
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73 static const DMScaledBlitFunc dmScaledBlitTable[DMD_NMODES][DMD_NBITDEPTHS][DMD_NBITDEPTHS] =
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74 {
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75 // DMD_NONE
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76 {
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77 { dmScaledBlitSurface8to8 , dmScaledBlitSurface8to32 },
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78 { NULL , dmScaledBlitSurface32to32 },
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79 },
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80 // DMD_TRANSPARENT
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81 {
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82 { dmScaledBlitSurface8to8Transparent , dmScaledBlitSurface8to32Transparent },
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83 { NULL , dmScaledBlitSurface32to32Transparent },
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84 },
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85 // DMD_SATURATE
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86 {
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87 { dmScaledBlitSurface8to8Saturate , dmScaledBlitSurface8to32Saturate },
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88 { NULL , dmScaledBlitSurface32to32Saturate },
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89 },
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90 #if 0
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91 // DMD_NONE | DMD_ANTIALIAS
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92 {
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93 { dmScaledBlitSurface8to8Antialias , dmScaledBlitSurface8to32Antialias },
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94 { NULL , dmScaledBlitSurface32to32Antialias },
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95 },
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96 // DMD_TRANSPARENT | DMD_ANTIALIAS
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97 {
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98 { dmScaledBlitSurface8to8AATransp , dmScaledBlitSurface8to32AATransparent },
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99 { NULL , dmScaledBlitSurface32to32AATransparent },
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100 },
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101 // DMD_SATURATE | DMD_ANTIALIAS
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102 {
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103 { dmScaledBlitSurface8to8AASaturate , dmScaledBlitSurface8to32AASaturate },
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104 { NULL , dmScaledBlitSurface32to32AASaturate },
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105 },
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106 #endif
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107 };
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108
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109 static const int ndmScaledBlitTable = sizeof(dmScaledBlitTable) / sizeof(dmScaledBlitTable[0]);
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110
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111 DMScaledBlitFunc dmGetScaledBlitFunc(SDL_PixelFormat *src, SDL_PixelFormat *dst, int mode)
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112 {
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113 int isrc, idst;
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114 if (src == NULL || dst == NULL || mode < 0 || mode >= ndmScaledBlitTable)
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115 return NULL;
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116
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117 isrc = dmBitsPerPixel2Index(src->BitsPerPixel);
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118 idst = dmBitsPerPixel2Index(dst->BitsPerPixel);
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119 if (isrc < 0 || idst < 0)
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120 return NULL;
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121
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122 return dmScaledBlitTable[mode][isrc][idst];
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123 }
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124
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125
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126 int dmScaledBlitSurfaceAny(SDL_Surface *src, const int x0, const int y0, const int dwidth, const int dheight, SDL_Surface *dst, int mode)
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127 {
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128 DMScaledBlitFunc bfunc = dmGetScaledBlitFunc(src->format, dst->format, mode);
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129
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130 if (bfunc == NULL)
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131 return -15;
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132
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133 return bfunc(src, x0, y0, dwidth, dheight, dst);
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134 }
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