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annotate dmblit.c @ 96:6bf5220fa47e

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Urgh .. use memset to silence some bogus GCC warnings about using potentially uninitialized values, while that will not actually be possible. In any case, it is annoying.
author Matti Hamalainen <ccr@tnsp.org>
date Tue, 02 Oct 2012 18:52:28 +0300
parents 0430f484641b
children e74ad60b1e85
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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0
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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 dmScaledClipCoord(DMQValue *pv, int v0, int v1, int v2, int clipMin, int clipMax)
0
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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
82
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71
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72 int dmUnscaledClipCoord(DMQValue *pv, int v0, int v1, int clipMin, int clipMax)
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73 {
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74 // Basic bounds check
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75 if (v1 < 1 || v0 + v1 < clipMin || v0 >= clipMax)
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76 return -1;
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77
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78 // Perform clipping
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79 if (v0 + v1 >= clipMax)
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80 {
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81 pv->vadd = v0;
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82 pv->v1 = clipMax;
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83 }
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84 else
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85 {
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86 pv->vadd = clipMax - v1;
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87 pv->v1 = v0 + v1;
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88 }
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89
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90 if (v0 < clipMin)
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91 {
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92 pv->voffs = clipMin - v0;
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93 pv->v0 = clipMin;
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94 pv->vadd -= v0 + clipMin;
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95 }
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96 else
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97 {
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98 pv->voffs = 0;
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99 pv->v0 = v0;
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100 }
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101
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102 return 0;
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103 }
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104
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105
0
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106 #include "dmblitfunc.h"
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107
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108
0
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109 static const DMScaledBlitFunc dmScaledBlitTable[DMD_NMODES][DMD_NBITDEPTHS][DMD_NBITDEPTHS] =
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110 {
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111 // DMD_NONE
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112 {
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113 { dmScaledBlitSurface8to8 , dmScaledBlitSurface8to32 },
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114 { NULL , dmScaledBlitSurface32to32 },
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115 },
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116 // DMD_TRANSPARENT
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117 {
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118 { dmScaledBlitSurface8to8Transparent , dmScaledBlitSurface8to32Transparent },
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119 { NULL , dmScaledBlitSurface32to32Transparent },
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120 },
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121 // DMD_SATURATE
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122 {
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123 { dmScaledBlitSurface8to8Saturate , dmScaledBlitSurface8to32Saturate },
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124 { NULL , dmScaledBlitSurface32to32Saturate },
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125 },
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126 #if 0
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127 // DMD_NONE | DMD_ANTIALIAS
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128 {
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129 { dmScaledBlitSurface8to8Antialias , dmScaledBlitSurface8to32Antialias },
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130 { NULL , dmScaledBlitSurface32to32Antialias },
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131 },
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132 // DMD_TRANSPARENT | DMD_ANTIALIAS
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133 {
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134 { dmScaledBlitSurface8to8AATransp , dmScaledBlitSurface8to32AATransparent },
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135 { NULL , dmScaledBlitSurface32to32AATransparent },
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136 },
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137 // DMD_SATURATE | DMD_ANTIALIAS
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138 {
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139 { dmScaledBlitSurface8to8AASaturate , dmScaledBlitSurface8to32AASaturate },
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140 { NULL , dmScaledBlitSurface32to32AASaturate },
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141 },
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142 #endif
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143 };
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144
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145 static const int ndmScaledBlitTable = sizeof(dmScaledBlitTable) / sizeof(dmScaledBlitTable[0]);
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146
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147
0
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148 DMScaledBlitFunc dmGetScaledBlitFunc(SDL_PixelFormat *src, SDL_PixelFormat *dst, int mode)
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149 {
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150 int isrc, idst;
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151 if (src == NULL || dst == NULL || mode < 0 || mode >= ndmScaledBlitTable)
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152 return NULL;
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153
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154 isrc = dmBitsPerPixel2Index(src->BitsPerPixel);
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155 idst = dmBitsPerPixel2Index(dst->BitsPerPixel);
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156 if (isrc < 0 || idst < 0)
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157 return NULL;
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158
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159 return dmScaledBlitTable[mode][isrc][idst];
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160 }
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161
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162
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163 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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164 {
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165 DMScaledBlitFunc bfunc = dmGetScaledBlitFunc(src->format, dst->format, mode);
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166
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167 if (bfunc == NULL)
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168 return -15;
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169
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170 return bfunc(src, x0, y0, dwidth, dheight, dst);
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171 }
95
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172
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173
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174 static const DMUnscaledBlitFunc dmUnscaledBlitTable[DMD_NMODES][DMD_NBITDEPTHS][DMD_NBITDEPTHS] =
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175 {
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176 // DMD_NONE
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177 {
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178 { dmUnscaledBlitSurface8to8 , dmUnscaledBlitSurface8to32 },
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179 { NULL , dmUnscaledBlitSurface32to32 },
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180 },
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181 // DMD_TRANSPARENT
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182 {
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183 { dmUnscaledBlitSurface8to8Transparent, dmUnscaledBlitSurface8to32Transparent },
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184 { NULL , dmUnscaledBlitSurface32to32Transparent },
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185 },
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186 // DMD_SATURATE
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187 {
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188 { dmUnscaledBlitSurface8to8Saturate , dmUnscaledBlitSurface8to32Saturate },
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189 { NULL , dmUnscaledBlitSurface32to32Saturate },
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190 },
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191 #if 0
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192 // DMD_NONE | DMD_ANTIALIAS
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193 {
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194 { dmUnscaledBlitSurface8to8Antialias , dmUnscaledBlitSurface8to32Antialias },
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195 { NULL , dmUnscaledBlitSurface32to32Antialias },
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196 },
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197 // DMD_TRANSPARENT | DMD_ANTIALIAS
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198 {
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199 { dmUnscaledBlitSurface8to8AATransp , dmUnscaledBlitSurface8to32AATransparent },
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200 { NULL , dmUnscaledBlitSurface32to32AATransparent },
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201 },
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202 // DMD_SATURATE | DMD_ANTIALIAS
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203 {
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204 { dmUnscaledBlitSurface8to8AASaturate , dmUnscaledBlitSurface8to32AASaturate },
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205 { NULL , dmUnscaledBlitSurface32to32AASaturate },
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206 },
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207 #endif
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208 };
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209
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210 static const int ndmUnscaledBlitTable = sizeof(dmUnscaledBlitTable) / sizeof(dmUnscaledBlitTable[0]);
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211
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212
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213
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214 DMUnscaledBlitFunc dmGetUnscaledBlitFunc(SDL_PixelFormat *src, SDL_PixelFormat *dst, int mode)
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215 {
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216 int isrc, idst;
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217 if (src == NULL || dst == NULL || mode < 0 || mode >= ndmUnscaledBlitTable)
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218 return NULL;
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219
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220 isrc = dmBitsPerPixel2Index(src->BitsPerPixel);
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221 idst = dmBitsPerPixel2Index(dst->BitsPerPixel);
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222 if (isrc < 0 || idst < 0)
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223 return NULL;
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224
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225 return dmUnscaledBlitTable[mode][isrc][idst];
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226 }
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227
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228
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229 int dmUnscaledBlitSurfaceAny(SDL_Surface *src, const int x0, const int y0, SDL_Surface *dst, int mode)
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230 {
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231 DMUnscaledBlitFunc bfunc = dmGetUnscaledBlitFunc(src->format, dst->format, mode);
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232
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233 if (bfunc == NULL)
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234 return -15;
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235
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236 return bfunc(src, x0, y0, dst);
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237 }