Mercurial > sdl-ios-xcode
annotate src/video/SDL_blit.c @ 2250:e1d228456537
Fixed a few compiler warnings.
Added SDL_blit_copy.c to the Visual C++ project
The SSE and MMX intrinsics don't compile on Visual Studio yet...
author | Sam Lantinga <slouken@libsdl.org> |
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date | Thu, 16 Aug 2007 06:20:51 +0000 |
parents | 5a58b57b6724 |
children | 6d99edd791bf |
rev | line source |
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0 | 1 /* |
2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997-2006 Sam Lantinga |
0 | 4 |
5 This library is free software; you can redistribute it and/or | |
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6 modify it under the terms of the GNU Lesser General Public |
0 | 7 License as published by the Free Software Foundation; either |
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8 version 2.1 of the License, or (at your option) any later version. |
0 | 9 |
10 This library is distributed in the hope that it will be useful, | |
11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
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13 Lesser General Public License for more details. |
0 | 14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
0 | 18 |
19 Sam Lantinga | |
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20 slouken@libsdl.org |
0 | 21 */ |
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22 #include "SDL_config.h" |
0 | 23 |
24 #include "SDL_video.h" | |
25 #include "SDL_sysvideo.h" | |
26 #include "SDL_blit.h" | |
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27 #include "SDL_blit_copy.h" |
0 | 28 #include "SDL_RLEaccel_c.h" |
29 #include "SDL_pixels_c.h" | |
30 | |
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31 #if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__)) && SDL_ASSEMBLY_ROUTINES |
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32 #define MMX_ASMBLIT |
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33 #endif |
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34 |
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35 #if defined(MMX_ASMBLIT) |
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36 #include "SDL_cpuinfo.h" |
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37 #include "mmx.h" |
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38 #endif |
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39 |
0 | 40 /* The general purpose software blit routine */ |
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41 static int |
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42 SDL_SoftBlit(SDL_Surface * src, SDL_Rect * srcrect, |
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43 SDL_Surface * dst, SDL_Rect * dstrect) |
0 | 44 { |
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45 int okay; |
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46 int src_locked; |
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47 int dst_locked; |
0 | 48 |
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49 /* Everything is okay at the beginning... */ |
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50 okay = 1; |
0 | 51 |
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52 /* Lock the destination if it's in hardware */ |
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53 dst_locked = 0; |
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54 if (SDL_MUSTLOCK(dst)) { |
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55 if (SDL_LockSurface(dst) < 0) { |
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56 okay = 0; |
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57 } else { |
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58 dst_locked = 1; |
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59 } |
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60 } |
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61 /* Lock the source if it's in hardware */ |
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62 src_locked = 0; |
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63 if (SDL_MUSTLOCK(src)) { |
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64 if (SDL_LockSurface(src) < 0) { |
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65 okay = 0; |
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66 } else { |
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67 src_locked = 1; |
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68 } |
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69 } |
0 | 70 |
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71 /* Set up source and destination buffer pointers, and BLIT! */ |
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72 if (okay && srcrect->w && srcrect->h) { |
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73 SDL_BlitInfo info; |
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74 SDL_loblit RunBlit; |
0 | 75 |
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76 /* Set up the blit information */ |
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77 info.s_pixels = (Uint8 *) src->pixels + |
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78 (Uint16) srcrect->y * src->pitch + |
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79 (Uint16) srcrect->x * src->format->BytesPerPixel; |
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80 info.s_width = srcrect->w; |
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81 info.s_height = srcrect->h; |
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82 info.s_skip = src->pitch - info.s_width * src->format->BytesPerPixel; |
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83 info.d_pixels = (Uint8 *) dst->pixels + |
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84 (Uint16) dstrect->y * dst->pitch + |
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85 (Uint16) dstrect->x * dst->format->BytesPerPixel; |
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86 info.d_width = dstrect->w; |
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87 info.d_height = dstrect->h; |
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88 info.d_skip = dst->pitch - info.d_width * dst->format->BytesPerPixel; |
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89 info.aux_data = src->map->sw_data->aux_data; |
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90 info.src = src->format; |
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91 info.table = src->map->table; |
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92 info.dst = dst->format; |
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93 RunBlit = src->map->sw_data->blit; |
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95 /* Run the actual software blit */ |
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96 RunBlit(&info); |
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97 } |
0 | 98 |
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99 /* We need to unlock the surfaces if they're locked */ |
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100 if (dst_locked) { |
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101 SDL_UnlockSurface(dst); |
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102 } |
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103 if (src_locked) { |
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104 SDL_UnlockSurface(src); |
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105 } |
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106 /* Blit is done! */ |
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107 return (okay ? 0 : -1); |
0 | 108 } |
109 | |
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110 #ifdef __MACOSX__ |
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111 #include <sys/sysctl.h> |
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112 |
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113 static SDL_bool |
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114 SDL_UseAltivecPrefetch() |
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115 { |
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116 const char key[] = "hw.l3cachesize"; |
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117 u_int64_t result = 0; |
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118 size_t typeSize = sizeof(result); |
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119 |
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120 if (sysctlbyname(key, &result, &typeSize, NULL, 0) == 0 && result > 0) { |
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121 return SDL_TRUE; |
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122 } else { |
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123 return SDL_FALSE; |
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124 } |
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125 } |
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126 #else |
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127 static SDL_bool |
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128 SDL_UseAltivecPrefetch() |
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129 { |
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130 /* Just guess G4 */ |
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131 return SDL_TRUE; |
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132 } |
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133 #endif /* __MACOSX__ */ |
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134 |
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135 static SDL_loblit |
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136 SDL_ChooseBlitFunc(SDL_BlitEntry * entries, int count) |
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137 { |
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138 int i; |
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139 static Uint32 features = 0xffffffff; |
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140 |
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141 if (features == 0xffffffff) { |
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142 const char *override = SDL_getenv("SDL_BLIT_FEATURES"); |
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143 |
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144 features = SDL_BLIT_ANY; |
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146 /* Allow an override for testing .. */ |
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147 if (override) { |
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148 SDL_sscanf(override, "%u", &features); |
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149 } else { |
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150 if (SDL_HasMMX()) { |
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151 features |= SDL_BLIT_MMX; |
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152 } |
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153 if (SDL_HasSSE()) { |
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154 features |= SDL_BLIT_SSE; |
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155 } |
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156 if (SDL_HasAltiVec()) { |
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157 if (SDL_UseAltivecPrefetch()) { |
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158 features |= SDL_BLIT_ALTIVEC_PREFETCH; |
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159 } else { |
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160 features |= SDL_BLIT_ALTIVEC_NOPREFETCH; |
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161 } |
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162 } |
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163 } |
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164 } |
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165 |
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166 for (i = count; i > 0; --i) { |
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167 if (features & entries[i].features) { |
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168 return entries[i].blit; |
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169 } |
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170 } |
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171 return entries[0].blit; |
0 | 172 } |
173 | |
174 /* Figure out which of many blit routines to set up on a surface */ | |
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175 int |
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176 SDL_CalculateBlit(SDL_Surface * surface) |
0 | 177 { |
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178 int blit_index; |
0 | 179 |
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180 /* Clean everything out to start */ |
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181 if ((surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL) { |
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182 SDL_UnRLESurface(surface, 1); |
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183 } |
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184 surface->map->sw_blit = NULL; |
0 | 185 |
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186 /* Get the blit function index, based on surface mode */ |
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187 /* { 0 = nothing, 1 = colorkey, 2 = alpha, 3 = colorkey+alpha } */ |
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188 blit_index = 0; |
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189 blit_index |= (!!(surface->flags & SDL_SRCCOLORKEY)) << 0; |
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190 if (surface->flags & SDL_SRCALPHA |
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191 && (surface->format->alpha != SDL_ALPHA_OPAQUE |
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192 || surface->format->Amask)) { |
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193 blit_index |= 2; |
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194 } |
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195 |
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196 /* Check for special "identity" case -- copy blit */ |
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197 if (surface->map->identity && blit_index == 0) { |
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198 /* Handle overlapping blits on the same surface */ |
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199 if (surface == surface->map->dst) { |
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200 surface->map->sw_data->blit = SDL_BlitCopyOverlap; |
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201 } else { |
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202 surface->map->sw_data->blit = SDL_BlitCopy; |
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203 } |
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204 } else { |
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205 if (surface->format->BitsPerPixel < 8) { |
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206 surface->map->sw_data->blit = |
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207 SDL_CalculateBlit0(surface, blit_index); |
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208 } else { |
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209 switch (surface->format->BytesPerPixel) { |
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210 case 1: |
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211 surface->map->sw_data->blit = |
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212 SDL_CalculateBlit1(surface, blit_index); |
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213 break; |
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214 case 2: |
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215 case 3: |
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216 case 4: |
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217 surface->map->sw_data->blit = |
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218 SDL_CalculateBlitN(surface, blit_index); |
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219 break; |
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220 default: |
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221 surface->map->sw_data->blit = NULL; |
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222 break; |
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223 } |
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224 } |
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225 } |
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226 /* Make sure we have a blit function */ |
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227 if (surface->map->sw_data->blit == NULL) { |
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228 SDL_InvalidateMap(surface->map); |
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229 SDL_SetError("Blit combination not supported"); |
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230 return (-1); |
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231 } |
0 | 232 |
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233 /* Choose software blitting function */ |
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234 if (surface->flags & SDL_RLEACCELOK) { |
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235 if (surface->map->identity |
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236 && (blit_index == 1 |
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237 || (blit_index == 3 && !surface->format->Amask))) { |
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238 if (SDL_RLESurface(surface) == 0) |
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239 surface->map->sw_blit = SDL_RLEBlit; |
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240 } else if (blit_index == 2 && surface->format->Amask) { |
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241 if (SDL_RLESurface(surface) == 0) |
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242 surface->map->sw_blit = SDL_RLEAlphaBlit; |
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243 } |
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244 } |
0 | 245 |
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246 if (surface->map->sw_blit == NULL) { |
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247 surface->map->sw_blit = SDL_SoftBlit; |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1402
diff
changeset
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248 } |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1402
diff
changeset
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249 return (0); |
0 | 250 } |
251 | |
1895
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1402
diff
changeset
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252 /* vi: set ts=4 sw=4 expandtab: */ |