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annotate src/video/SDL_blit.c @ 2260:202ddfd1cfb1

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author Sam Lantinga <slouken@libsdl.org>
date Fri, 17 Aug 2007 02:55:21 +0000
parents 340942cfda48
children bee005ace1bf
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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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
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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.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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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
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 #include "SDL_video.h"
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25 #include "SDL_sysvideo.h"
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26 #include "SDL_blit.h"
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27 #include "SDL_blit_copy.h"
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28 #include "SDL_RLEaccel_c.h"
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29 #include "SDL_pixels_c.h"
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30
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31 /* The general purpose software blit routine */
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32 static int
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33 SDL_SoftBlit(SDL_Surface * src, SDL_Rect * srcrect,
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34 SDL_Surface * dst, SDL_Rect * dstrect)
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35 {
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36 int okay;
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37 int src_locked;
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38 int dst_locked;
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39
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40 /* Everything is okay at the beginning... */
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41 okay = 1;
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42
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43 /* Lock the destination if it's in hardware */
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44 dst_locked = 0;
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45 if (SDL_MUSTLOCK(dst)) {
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46 if (SDL_LockSurface(dst) < 0) {
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47 okay = 0;
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48 } else {
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49 dst_locked = 1;
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50 }
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51 }
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52 /* Lock the source if it's in hardware */
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53 src_locked = 0;
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54 if (SDL_MUSTLOCK(src)) {
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55 if (SDL_LockSurface(src) < 0) {
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56 okay = 0;
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57 } else {
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58 src_locked = 1;
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59 }
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60 }
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61
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62 /* Set up source and destination buffer pointers, and BLIT! */
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63 if (okay && srcrect->w && srcrect->h) {
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64 SDL_BlitInfo info;
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65 SDL_loblit RunBlit;
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66
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67 /* Set up the blit information */
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68 info.s_pixels = (Uint8 *) src->pixels +
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69 (Uint16) srcrect->y * src->pitch +
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70 (Uint16) srcrect->x * src->format->BytesPerPixel;
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71 info.s_width = srcrect->w;
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72 info.s_height = srcrect->h;
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73 info.s_skip = src->pitch - info.s_width * src->format->BytesPerPixel;
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74 info.d_pixels = (Uint8 *) dst->pixels +
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75 (Uint16) dstrect->y * dst->pitch +
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76 (Uint16) dstrect->x * dst->format->BytesPerPixel;
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77 info.d_width = dstrect->w;
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78 info.d_height = dstrect->h;
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79 info.d_skip = dst->pitch - info.d_width * dst->format->BytesPerPixel;
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80 info.src = src->format;
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81 info.table = src->map->table;
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82 info.dst = dst->format;
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83 info.ckey = src->map->ckey;
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84 info.cmod = src->map->cmod;
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85 RunBlit = (SDL_loblit) src->map->data;
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86
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87 /* Run the actual software blit */
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88 RunBlit(&info);
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89 }
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90
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91 /* We need to unlock the surfaces if they're locked */
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92 if (dst_locked) {
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93 SDL_UnlockSurface(dst);
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94 }
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95 if (src_locked) {
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96 SDL_UnlockSurface(src);
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97 }
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98 /* Blit is done! */
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99 return (okay ? 0 : -1);
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100 }
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101
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102 #ifdef __MACOSX__
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103 #include <sys/sysctl.h>
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104
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105 static SDL_bool
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106 SDL_UseAltivecPrefetch()
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107 {
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108 const char key[] = "hw.l3cachesize";
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109 u_int64_t result = 0;
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110 size_t typeSize = sizeof(result);
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111
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112 if (sysctlbyname(key, &result, &typeSize, NULL, 0) == 0 && result > 0) {
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113 return SDL_TRUE;
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114 } else {
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115 return SDL_FALSE;
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116 }
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117 }
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118 #else
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119 static SDL_bool
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120 SDL_UseAltivecPrefetch()
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121 {
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122 /* Just guess G4 */
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123 return SDL_TRUE;
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124 }
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125 #endif /* __MACOSX__ */
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126
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127 static SDL_loblit
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128 SDL_ChooseBlitFunc(SDL_BlitEntry * entries, int count)
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129 {
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130 int i;
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131 static Uint32 features = 0xffffffff;
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132
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133 if (features == 0xffffffff) {
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134 const char *override = SDL_getenv("SDL_BLIT_FEATURES");
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135
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136 features = SDL_BLIT_ANY;
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137
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138 /* Allow an override for testing .. */
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139 if (override) {
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140 SDL_sscanf(override, "%u", &features);
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141 } else {
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142 if (SDL_HasMMX()) {
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143 features |= SDL_BLIT_MMX;
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144 }
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145 if (SDL_HasSSE()) {
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146 features |= SDL_BLIT_SSE;
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147 }
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148 if (SDL_HasAltiVec()) {
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149 if (SDL_UseAltivecPrefetch()) {
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150 features |= SDL_BLIT_ALTIVEC_PREFETCH;
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151 } else {
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152 features |= SDL_BLIT_ALTIVEC_NOPREFETCH;
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153 }
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154 }
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155 }
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156 }
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157
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158 for (i = count; i > 0; --i) {
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159 if (features & entries[i].features) {
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160 return entries[i].blit;
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161 }
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162 }
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163 return entries[0].blit;
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164 }
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165
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166 /* Figure out which of many blit routines to set up on a surface */
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167 int
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168 SDL_CalculateBlit(SDL_Surface * surface)
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169 {
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170 SDL_loblit blit = NULL;
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171 int blit_index;
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172
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173 /* Clean everything out to start */
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174 if ((surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL) {
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175 SDL_UnRLESurface(surface, 1);
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176 }
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177 surface->map->blit = NULL;
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178
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179 /* Get the blit function index, based on surface mode */
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180 /* { 0 = nothing, 1 = colorkey, 2 = alpha, 3 = colorkey+alpha } */
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181 blit_index = 0;
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182 blit_index |= (!!(surface->flags & SDL_SRCCOLORKEY)) << 0;
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183 if (surface->flags & SDL_SRCALPHA
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184 && ((surface->map->cmod >> 24) != SDL_ALPHA_OPAQUE
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185 || surface->format->Amask)) {
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186 blit_index |= 2;
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187 }
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188
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189 /* Check for special "identity" case -- copy blit */
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190 if (surface->map->identity && blit_index == 0) {
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191 /* Handle overlapping blits on the same surface */
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192 if (surface == surface->map->dst) {
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193 blit = SDL_BlitCopyOverlap;
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194 } else {
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195 blit = SDL_BlitCopy;
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196 }
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197 } else {
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198 if (surface->format->BitsPerPixel < 8) {
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199 blit = SDL_CalculateBlit0(surface, blit_index);
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200 } else {
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201 switch (surface->format->BytesPerPixel) {
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202 case 1:
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203 blit = SDL_CalculateBlit1(surface, blit_index);
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204 break;
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205 case 2:
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206 case 3:
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207 case 4:
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208 blit = SDL_CalculateBlitN(surface, blit_index);
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209 break;
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210 }
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211 }
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212 }
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213 /* Make sure we have a blit function */
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214 if (blit == NULL) {
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215 SDL_InvalidateMap(surface->map);
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216 SDL_SetError("Blit combination not supported");
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217 return (-1);
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218 }
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219
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220 /* Choose software blitting function */
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221 if (surface->flags & SDL_RLEACCELOK) {
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222 if (surface->map->identity
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223 && (blit_index == 1
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224 || (blit_index == 3 && !surface->format->Amask))) {
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225 if (SDL_RLESurface(surface) == 0)
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226 surface->map->blit = SDL_RLEBlit;
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227 } else if (blit_index == 2 && surface->format->Amask) {
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228 if (SDL_RLESurface(surface) == 0)
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229 surface->map->blit = SDL_RLEAlphaBlit;
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230 }
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231 }
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232
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233 if (surface->map->blit == NULL) {
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234 surface->map->blit = SDL_SoftBlit;
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235 surface->map->data = blit;
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236 }
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237 return (0);
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238 }
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239
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240 /* vi: set ts=4 sw=4 expandtab: */