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0
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@devolution.com
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 #include <stdio.h>
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29 #include <stdlib.h>
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30 #include <string.h>
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31
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32 #include "SDL_error.h"
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33 #include "SDL_video.h"
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34 #include "SDL_sysvideo.h"
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35 #include "SDL_cursor_c.h"
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36 #include "SDL_blit.h"
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37 #include "SDL_RLEaccel_c.h"
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38 #include "SDL_pixels_c.h"
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39 #include "SDL_memops.h"
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40 #include "SDL_leaks.h"
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41
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42 /* Public routines */
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43 /*
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44 * Create an empty RGB surface of the appropriate depth
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45 */
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46 SDL_Surface * SDL_CreateRGBSurface (Uint32 flags,
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47 int width, int height, int depth,
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48 Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask)
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49 {
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50 SDL_VideoDevice *video = current_video;
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51 SDL_VideoDevice *this = current_video;
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52 SDL_Surface *screen;
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53 SDL_Surface *surface;
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54
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55 /* Check to see if we desire the surface in video memory */
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56 if ( video ) {
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57 screen = SDL_PublicSurface;
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58 } else {
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59 screen = NULL;
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60 }
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61 if ( screen && ((screen->flags&SDL_HWSURFACE) == SDL_HWSURFACE) ) {
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62 if ( (flags&(SDL_SRCCOLORKEY|SDL_SRCALPHA)) != 0 ) {
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63 flags |= SDL_HWSURFACE;
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64 }
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65 if ( (flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY ) {
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66 if ( ! current_video->info.blit_hw_CC ) {
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67 flags &= ~SDL_HWSURFACE;
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68 }
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69 }
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70 if ( (flags & SDL_SRCALPHA) == SDL_SRCALPHA ) {
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71 if ( ! current_video->info.blit_hw_A ) {
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72 flags &= ~SDL_HWSURFACE;
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73 }
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74 }
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75 } else {
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76 flags &= ~SDL_HWSURFACE;
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77 }
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78
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79 /* Allocate the surface */
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80 surface = (SDL_Surface *)malloc(sizeof(*surface));
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81 if ( surface == NULL ) {
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82 SDL_OutOfMemory();
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83 return(NULL);
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84 }
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85 surface->flags = SDL_SWSURFACE;
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86 if ( (flags & SDL_HWSURFACE) == SDL_HWSURFACE ) {
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87 depth = screen->format->BitsPerPixel;
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88 Rmask = screen->format->Rmask;
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89 Gmask = screen->format->Gmask;
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90 Bmask = screen->format->Bmask;
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91 Amask = screen->format->Amask;
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92 }
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93 surface->format = SDL_AllocFormat(depth, Rmask, Gmask, Bmask, Amask);
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94 if ( surface->format == NULL ) {
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95 free(surface);
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96 return(NULL);
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97 }
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98 if ( Amask ) {
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99 surface->flags |= SDL_SRCALPHA;
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100 }
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101 surface->w = width;
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102 surface->h = height;
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103 surface->pitch = SDL_CalculatePitch(surface);
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104 surface->pixels = NULL;
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105 surface->offset = 0;
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106 surface->hwdata = NULL;
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107 surface->locked = 0;
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108 surface->map = NULL;
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109 surface->format_version = 0;
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110 SDL_SetClipRect(surface, NULL);
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111
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112 /* Get the pixels */
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113 if ( ((flags&SDL_HWSURFACE) == SDL_SWSURFACE) ||
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114 (video->AllocHWSurface(this, surface) < 0) ) {
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115 if ( surface->w && surface->h ) {
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116 surface->pixels = malloc(surface->h*surface->pitch);
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117 if ( surface->pixels == NULL ) {
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118 SDL_FreeSurface(surface);
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119 SDL_OutOfMemory();
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120 return(NULL);
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121 }
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122 /* This is important for bitmaps */
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123 memset(surface->pixels, 0, surface->h*surface->pitch);
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124 }
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125 }
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126
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127 /* Allocate an empty mapping */
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128 surface->map = SDL_AllocBlitMap();
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129 if ( surface->map == NULL ) {
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130 SDL_FreeSurface(surface);
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131 return(NULL);
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132 }
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133
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134 /* The surface is ready to go */
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135 surface->refcount = 1;
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136 #ifdef CHECK_LEAKS
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137 ++surfaces_allocated;
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138 #endif
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139 return(surface);
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140 }
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141 /*
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142 * Create an RGB surface from an existing memory buffer
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143 */
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144 SDL_Surface * SDL_CreateRGBSurfaceFrom (void *pixels,
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145 int width, int height, int depth, int pitch,
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146 Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask)
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147 {
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148 SDL_Surface *surface;
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149
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150 surface = SDL_CreateRGBSurface(SDL_SWSURFACE, 0, 0, depth,
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151 Rmask, Gmask, Bmask, Amask);
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152 if ( surface != NULL ) {
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153 surface->flags |= SDL_PREALLOC;
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154 surface->pixels = pixels;
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155 surface->w = width;
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156 surface->h = height;
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157 surface->pitch = pitch;
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158 SDL_SetClipRect(surface, NULL);
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159 }
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160 return(surface);
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161 }
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162 /*
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163 * Set the color key in a blittable surface
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164 */
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165 int SDL_SetColorKey (SDL_Surface *surface, Uint32 flag, Uint32 key)
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166 {
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167 /* Sanity check the flag as it gets passed in */
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168 if ( flag & SDL_SRCCOLORKEY ) {
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169 if ( flag & (SDL_RLEACCEL|SDL_RLEACCELOK) ) {
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170 flag = (SDL_SRCCOLORKEY | SDL_RLEACCELOK);
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171 } else {
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172 flag = SDL_SRCCOLORKEY;
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173 }
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174 } else {
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175 flag = 0;
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176 }
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177
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178 /* Optimize away operations that don't change anything */
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179 if ( (flag == (surface->flags & (SDL_SRCCOLORKEY|SDL_RLEACCELOK))) &&
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180 (key == surface->format->colorkey) ) {
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181 return(0);
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182 }
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183
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184 /* UnRLE surfaces before we change the colorkey */
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185 if ( surface->flags & SDL_RLEACCEL ) {
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186 SDL_UnRLESurface(surface, 1);
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187 }
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188
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189 if ( flag ) {
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190 SDL_VideoDevice *video = current_video;
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191 SDL_VideoDevice *this = current_video;
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192
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193
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194 surface->flags |= SDL_SRCCOLORKEY;
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195 surface->format->colorkey = key;
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196 if ( (surface->flags & SDL_HWACCEL) == SDL_HWACCEL ) {
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197 if ( (video->SetHWColorKey == NULL) ||
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198 (video->SetHWColorKey(this, surface, key) < 0) ) {
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199 surface->flags &= ~SDL_HWACCEL;
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200 }
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201 }
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202 if ( flag & SDL_RLEACCELOK ) {
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203 surface->flags |= SDL_RLEACCELOK;
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204 } else {
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205 surface->flags &= ~SDL_RLEACCELOK;
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206 }
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207 } else {
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208 surface->flags &= ~(SDL_SRCCOLORKEY|SDL_RLEACCELOK);
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209 surface->format->colorkey = 0;
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210 }
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211 SDL_InvalidateMap(surface->map);
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212 return(0);
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213 }
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214 int SDL_SetAlpha (SDL_Surface *surface, Uint32 flag, Uint8 value)
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215 {
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216 Uint32 oldflags = surface->flags;
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217 Uint32 oldalpha = surface->format->alpha;
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218
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219 /* Sanity check the flag as it gets passed in */
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220 if ( flag & SDL_SRCALPHA ) {
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221 if ( flag & (SDL_RLEACCEL|SDL_RLEACCELOK) ) {
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222 flag = (SDL_SRCALPHA | SDL_RLEACCELOK);
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223 } else {
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224 flag = SDL_SRCALPHA;
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225 }
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226 } else {
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227 flag = 0;
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228 }
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229
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230 /* Optimize away operations that don't change anything */
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231 if ( (flag == (surface->flags & (SDL_SRCALPHA|SDL_RLEACCELOK))) &&
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232 (!flag || value == oldalpha) ) {
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233 return(0);
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234 }
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235
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236 if(!(flag & SDL_RLEACCELOK) && (surface->flags & SDL_RLEACCEL))
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237 SDL_UnRLESurface(surface, 1);
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238
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239 if ( flag ) {
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240 SDL_VideoDevice *video = current_video;
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241 SDL_VideoDevice *this = current_video;
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242
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243 surface->flags |= SDL_SRCALPHA;
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244 surface->format->alpha = value;
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245 if ( (surface->flags & SDL_HWACCEL) == SDL_HWACCEL ) {
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246 if ( (video->SetHWAlpha == NULL) ||
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247 (video->SetHWAlpha(this, surface, value) < 0) ) {
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248 surface->flags &= ~SDL_HWACCEL;
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249 }
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250 }
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251 if ( flag & SDL_RLEACCELOK ) {
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252 surface->flags |= SDL_RLEACCELOK;
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253 } else {
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254 surface->flags &= ~SDL_RLEACCELOK;
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255 }
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256 } else {
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257 surface->flags &= ~SDL_SRCALPHA;
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258 surface->format->alpha = SDL_ALPHA_OPAQUE;
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259 }
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260 /*
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261 * The representation for software surfaces is independent of
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262 * per-surface alpha, so no need to invalidate the blit mapping
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263 * if just the alpha value was changed. (If either is 255, we still
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264 * need to invalidate.)
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265 */
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266 if((surface->flags & SDL_HWACCEL) == SDL_HWACCEL
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267 || oldflags != surface->flags
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268 || (((oldalpha + 1) ^ (value + 1)) & 0x100))
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269 SDL_InvalidateMap(surface->map);
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270 return(0);
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271 }
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272
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273 /*
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274 * A function to calculate the intersection of two rectangles:
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275 * return true if the rectangles intersect, false otherwise
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276 */
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277 static __inline__
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278 SDL_bool SDL_IntersectRect(SDL_Rect *A, SDL_Rect *B, SDL_Rect *intersection)
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279 {
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280 int Amin, Amax, Bmin, Bmax;
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281
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282 /* Horizontal intersection */
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283 Amin = A->x;
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284 Amax = Amin + A->w;
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285 Bmin = B->x;
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286 Bmax = Bmin + B->w;
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287 if(Bmin > Amin)
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288 Amin = Bmin;
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289 intersection->x = Amin;
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290 if(Bmax < Amax)
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291 Amax = Bmax;
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292 intersection->w = Amax - Amin > 0 ? Amax - Amin : 0;
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293
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294 /* Vertical intersection */
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295 Amin = A->y;
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296 Amax = Amin + A->h;
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297 Bmin = B->y;
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298 Bmax = Bmin + B->h;
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299 if(Bmin > Amin)
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300 Amin = Bmin;
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301 intersection->y = Amin;
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302 if(Bmax < Amax)
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303 Amax = Bmax;
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304 intersection->h = Amax - Amin > 0 ? Amax - Amin : 0;
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305
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306 return (intersection->w && intersection->h);
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307 }
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308 /*
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309 * Set the clipping rectangle for a blittable surface
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310 */
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311 SDL_bool SDL_SetClipRect(SDL_Surface *surface, SDL_Rect *rect)
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312 {
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313 SDL_Rect full_rect;
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314
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315 /* Don't do anything if there's no surface to act on */
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316 if ( ! surface ) {
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317 return SDL_FALSE;
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318 }
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319
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320 /* Set up the full surface rectangle */
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321 full_rect.x = 0;
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322 full_rect.y = 0;
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323 full_rect.w = surface->w;
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324 full_rect.h = surface->h;
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325
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326 /* Set the clipping rectangle */
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327 if ( ! rect ) {
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328 surface->clip_rect = full_rect;
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329 return 1;
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330 }
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331 return SDL_IntersectRect(rect, &full_rect, &surface->clip_rect);
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332 }
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333 void SDL_GetClipRect(SDL_Surface *surface, SDL_Rect *rect)
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334 {
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335 if ( surface && rect ) {
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336 *rect = surface->clip_rect;
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337 }
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338 }
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339 /*
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340 * Set up a blit between two surfaces -- split into three parts:
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341 * The upper part, SDL_UpperBlit(), performs clipping and rectangle
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342 * verification. The lower part is a pointer to a low level
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343 * accelerated blitting function.
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344 *
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345 * These parts are separated out and each used internally by this
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346 * library in the optimimum places. They are exported so that if
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347 * you know exactly what you are doing, you can optimize your code
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348 * by calling the one(s) you need.
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349 */
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350 int SDL_LowerBlit (SDL_Surface *src, SDL_Rect *srcrect,
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351 SDL_Surface *dst, SDL_Rect *dstrect)
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352 {
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353 SDL_blit do_blit;
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354
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355 /* Check to make sure the blit mapping is valid */
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356 if ( (src->map->dst != dst) ||
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357 (src->map->dst->format_version != src->map->format_version) ) {
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358 if ( SDL_MapSurface(src, dst) < 0 ) {
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359 return(-1);
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360 }
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361 }
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362
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363 /* Figure out which blitter to use */
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364 if ( (src->flags & SDL_HWACCEL) == SDL_HWACCEL ) {
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365 do_blit = src->map->hw_blit;
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366 } else {
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367 do_blit = src->map->sw_blit;
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368 }
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369 return(do_blit(src, srcrect, dst, dstrect));
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370 }
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371
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372
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373 int SDL_UpperBlit (SDL_Surface *src, SDL_Rect *srcrect,
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374 SDL_Surface *dst, SDL_Rect *dstrect)
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375 {
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376 SDL_Rect fulldst;
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377 int srcx, srcy, w, h;
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378
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379 /* Make sure the surfaces aren't locked */
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380 if ( ! src || ! dst ) {
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381 SDL_SetError("SDL_UpperBlit: passed a NULL surface");
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382 return(-1);
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383 }
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384 if ( src->locked || dst->locked ) {
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385 SDL_SetError("Surfaces must not be locked during blit");
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386 return(-1);
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387 }
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388
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389 /* If the destination rectangle is NULL, use the entire dest surface */
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390 if ( dstrect == NULL ) {
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391 fulldst.x = fulldst.y = 0;
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392 dstrect = &fulldst;
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393 }
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394
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395 /* clip the source rectangle to the source surface */
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396 if(srcrect) {
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397 int maxw, maxh;
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398
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399 srcx = srcrect->x;
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400 w = srcrect->w;
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401 if(srcx < 0) {
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402 w += srcx;
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403 dstrect->x -= srcx;
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404 srcx = 0;
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405 }
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406 maxw = src->w - srcx;
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407 if(maxw < w)
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408 w = maxw;
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409
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410 srcy = srcrect->y;
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411 h = srcrect->h;
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412 if(srcy < 0) {
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413 h += srcy;
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414 dstrect->y -= srcy;
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415 srcy = 0;
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|
|
416 }
|
|
|
417 maxh = src->h - srcy;
|
|
|
418 if(maxh < h)
|
|
|
419 h = maxh;
|
|
|
420
|
|
|
421 } else {
|
|
|
422 srcx = srcy = 0;
|
|
|
423 w = src->w;
|
|
|
424 h = src->h;
|
|
|
425 }
|
|
|
426
|
|
|
427 /* clip the destination rectangle against the clip rectangle */
|
|
|
428 {
|
|
|
429 SDL_Rect *clip = &dst->clip_rect;
|
|
|
430 int dx, dy;
|
|
|
431
|
|
|
432 dx = clip->x - dstrect->x;
|
|
|
433 if(dx > 0) {
|
|
|
434 w -= dx;
|
|
|
435 dstrect->x += dx;
|
|
|
436 srcx += dx;
|
|
|
437 }
|
|
|
438 dx = dstrect->x + w - clip->x - clip->w;
|
|
|
439 if(dx > 0)
|
|
|
440 w -= dx;
|
|
|
441
|
|
|
442 dy = clip->y - dstrect->y;
|
|
|
443 if(dy > 0) {
|
|
|
444 h -= dy;
|
|
|
445 dstrect->y += dy;
|
|
|
446 srcy += dy;
|
|
|
447 }
|
|
|
448 dy = dstrect->y + h - clip->y - clip->h;
|
|
|
449 if(dy > 0)
|
|
|
450 h -= dy;
|
|
|
451 }
|
|
|
452
|
|
|
453 if(w > 0 && h > 0) {
|
|
|
454 SDL_Rect sr;
|
|
|
455 sr.x = srcx;
|
|
|
456 sr.y = srcy;
|
|
|
457 sr.w = dstrect->w = w;
|
|
|
458 sr.h = dstrect->h = h;
|
|
|
459 return SDL_LowerBlit(src, &sr, dst, dstrect);
|
|
|
460 }
|
|
|
461 dstrect->w = dstrect->h = 0;
|
|
|
462 return 0;
|
|
|
463 }
|
|
|
464
|
|
|
465 /*
|
|
|
466 * This function performs a fast fill of the given rectangle with 'color'
|
|
|
467 */
|
|
|
468 int SDL_FillRect(SDL_Surface *dst, SDL_Rect *dstrect, Uint32 color)
|
|
|
469 {
|
|
|
470 SDL_VideoDevice *video = current_video;
|
|
|
471 SDL_VideoDevice *this = current_video;
|
|
|
472 int x, y;
|
|
|
473 Uint8 *row;
|
|
|
474
|
|
|
475 /* If 'dstrect' == NULL, then fill the whole surface */
|
|
|
476 if ( dstrect ) {
|
|
|
477 /* Perform clipping */
|
|
|
478 if ( !SDL_IntersectRect(dstrect, &dst->clip_rect, dstrect) ) {
|
|
|
479 return(0);
|
|
|
480 }
|
|
|
481 } else {
|
|
|
482 dstrect = &dst->clip_rect;
|
|
|
483 }
|
|
|
484
|
|
|
485 /* Check for hardware acceleration */
|
|
|
486 if ( ((dst->flags & SDL_HWSURFACE) == SDL_HWSURFACE) &&
|
|
|
487 video->info.blit_fill ) {
|
|
|
488 return(video->FillHWRect(this, dst, dstrect, color));
|
|
|
489 }
|
|
|
490
|
|
|
491 /* Perform software fill */
|
|
|
492 if ( SDL_LockSurface(dst) != 0 ) {
|
|
|
493 return(-1);
|
|
|
494 }
|
|
|
495 row = (Uint8 *)dst->pixels+dstrect->y*dst->pitch+
|
|
|
496 dstrect->x*dst->format->BytesPerPixel;
|
|
|
497 if ( dst->format->palette || (color == 0) ) {
|
|
|
498 x = dstrect->w*dst->format->BytesPerPixel;
|
|
|
499 if ( !color && !((long)row&3) && !(x&3) && !(dst->pitch&3) ) {
|
|
|
500 int n = x >> 2;
|
|
|
501 for ( y=dstrect->h; y; --y ) {
|
|
|
502 SDL_memset4(row, 0, n);
|
|
|
503 row += dst->pitch;
|
|
|
504 }
|
|
|
505 } else {
|
|
|
506 #ifdef __powerpc__
|
|
|
507 /*
|
|
|
508 * memset() on PPC (both glibc and codewarrior) uses
|
|
|
509 * the dcbz (Data Cache Block Zero) instruction, which
|
|
|
510 * causes an alignment exception if the destination is
|
|
|
511 * uncachable, so only use it on software surfaces
|
|
|
512 */
|
|
|
513 if((dst->flags & SDL_HWSURFACE) == SDL_HWSURFACE) {
|
|
|
514 if(dstrect->w >= 8) {
|
|
|
515 /*
|
|
|
516 * 64-bit stores are probably most
|
|
|
517 * efficient to uncached video memory
|
|
|
518 */
|
|
|
519 double fill;
|
|
|
520 memset(&fill, color, (sizeof fill));
|
|
|
521 for(y = dstrect->h; y; y--) {
|
|
|
522 Uint8 *d = row;
|
|
|
523 unsigned n = x;
|
|
|
524 unsigned nn;
|
|
|
525 Uint8 c = color;
|
|
|
526 double f = fill;
|
|
|
527 while((unsigned long)d
|
|
|
528 & (sizeof(double) - 1)) {
|
|
|
529 *d++ = c;
|
|
|
530 n--;
|
|
|
531 }
|
|
|
532 nn = n / (sizeof(double) * 4);
|
|
|
533 while(nn) {
|
|
|
534 ((double *)d)[0] = f;
|
|
|
535 ((double *)d)[1] = f;
|
|
|
536 ((double *)d)[2] = f;
|
|
|
537 ((double *)d)[3] = f;
|
|
|
538 d += 4*sizeof(double);
|
|
|
539 nn--;
|
|
|
540 }
|
|
|
541 n &= ~(sizeof(double) * 4 - 1);
|
|
|
542 nn = n / sizeof(double);
|
|
|
543 while(nn) {
|
|
|
544 *(double *)d = f;
|
|
|
545 d += sizeof(double);
|
|
|
546 nn--;
|
|
|
547 }
|
|
|
548 n &= ~(sizeof(double) - 1);
|
|
|
549 while(n) {
|
|
|
550 *d++ = c;
|
|
|
551 n--;
|
|
|
552 }
|
|
|
553 row += dst->pitch;
|
|
|
554 }
|
|
|
555 } else {
|
|
|
556 /* narrow boxes */
|
|
|
557 for(y = dstrect->h; y; y--) {
|
|
|
558 Uint8 *d = row;
|
|
|
559 Uint8 c = color;
|
|
|
560 int n = x;
|
|
|
561 while(n) {
|
|
|
562 *d++ = c;
|
|
|
563 n--;
|
|
|
564 }
|
|
|
565 row += dst->pitch;
|
|
|
566 }
|
|
|
567 }
|
|
|
568 } else
|
|
|
569 #endif /* __powerpc__ */
|
|
|
570 {
|
|
|
571 for(y = dstrect->h; y; y--) {
|
|
|
572 memset(row, color, x);
|
|
|
573 row += dst->pitch;
|
|
|
574 }
|
|
|
575 }
|
|
|
576 }
|
|
|
577 } else {
|
|
|
578 switch (dst->format->BytesPerPixel) {
|
|
|
579 case 2:
|
|
|
580 for ( y=dstrect->h; y; --y ) {
|
|
|
581 Uint16 *pixels = (Uint16 *)row;
|
|
|
582 Uint16 c = color;
|
|
|
583 Uint32 cc = (Uint32)c << 16 | c;
|
|
|
584 int n = dstrect->w;
|
|
|
585 if((unsigned long)pixels & 3) {
|
|
|
586 *pixels++ = c;
|
|
|
587 n--;
|
|
|
588 }
|
|
|
589 if(n >> 1)
|
|
|
590 SDL_memset4(pixels, cc, n >> 1);
|
|
|
591 if(n & 1)
|
|
|
592 pixels[n - 1] = c;
|
|
|
593 row += dst->pitch;
|
|
|
594 }
|
|
|
595 break;
|
|
|
596
|
|
|
597 case 3:
|
|
|
598 if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
|
|
|
599 color <<= 8;
|
|
|
600 for ( y=dstrect->h; y; --y ) {
|
|
|
601 Uint8 *pixels = row;
|
|
|
602 for ( x=dstrect->w; x; --x ) {
|
|
|
603 memcpy(pixels, &color, 3);
|
|
|
604 pixels += 3;
|
|
|
605 }
|
|
|
606 row += dst->pitch;
|
|
|
607 }
|
|
|
608 break;
|
|
|
609
|
|
|
610 case 4:
|
|
|
611 for(y = dstrect->h; y; --y) {
|
|
|
612 SDL_memset4(row, color, dstrect->w);
|
|
|
613 row += dst->pitch;
|
|
|
614 }
|
|
|
615 break;
|
|
|
616 }
|
|
|
617 }
|
|
|
618 SDL_UnlockSurface(dst);
|
|
|
619
|
|
|
620 /* We're done! */
|
|
|
621 return(0);
|
|
|
622 }
|
|
|
623
|
|
|
624 /*
|
|
|
625 * Lock a surface to directly access the pixels
|
|
|
626 * -- Do not call this from any blit function, as SDL_DrawCursor() may recurse
|
|
|
627 * Instead, use:
|
|
|
628 * if ( (surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE )
|
|
|
629 * video->LockHWSurface(video, surface);
|
|
|
630 */
|
|
|
631 int SDL_LockSurface (SDL_Surface *surface)
|
|
|
632 {
|
|
|
633 if ( ! surface->locked ) {
|
|
|
634 /* Perform the lock */
|
|
|
635 if ( surface->flags & (SDL_HWSURFACE|SDL_ASYNCBLIT) ) {
|
|
|
636 SDL_VideoDevice *video = current_video;
|
|
|
637 SDL_VideoDevice *this = current_video;
|
|
|
638 if ( video->LockHWSurface(this, surface) < 0 ) {
|
|
|
639 return(-1);
|
|
|
640 }
|
|
|
641 }
|
|
|
642 if ( surface->flags & SDL_RLEACCEL ) {
|
|
|
643 SDL_UnRLESurface(surface, 1);
|
|
|
644 surface->flags |= SDL_RLEACCEL; /* save accel'd state */
|
|
|
645 }
|
|
|
646 /* This needs to be done here in case pixels changes value */
|
|
|
647 surface->pixels = (Uint8 *)surface->pixels + surface->offset;
|
|
|
648 }
|
|
|
649
|
|
|
650 /* Increment the surface lock count, for recursive locks */
|
|
|
651 ++surface->locked;
|
|
|
652
|
|
|
653 /* Ready to go.. */
|
|
|
654 return(0);
|
|
|
655 }
|
|
|
656 /*
|
|
|
657 * Unlock a previously locked surface
|
|
|
658 * -- Do not call this from any blit function, as SDL_DrawCursor() may recurse
|
|
|
659 * Instead, use:
|
|
|
660 * if ( (surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE )
|
|
|
661 * video->UnlockHWSurface(video, surface);
|
|
|
662 */
|
|
|
663 void SDL_UnlockSurface (SDL_Surface *surface)
|
|
|
664 {
|
|
|
665 /* Only perform an unlock if we are locked */
|
|
|
666 if ( ! surface->locked || (--surface->locked > 0) ) {
|
|
|
667 return;
|
|
|
668 }
|
|
|
669
|
|
|
670 /* Perform the unlock */
|
|
|
671 surface->pixels = (Uint8 *)surface->pixels - surface->offset;
|
|
|
672
|
|
|
673 /* Unlock hardware or accelerated surfaces */
|
|
|
674 if ( surface->flags & (SDL_HWSURFACE|SDL_ASYNCBLIT) ) {
|
|
|
675 SDL_VideoDevice *video = current_video;
|
|
|
676 SDL_VideoDevice *this = current_video;
|
|
|
677 video->UnlockHWSurface(this, surface);
|
|
|
678 } else {
|
|
|
679 /* Update RLE encoded surface with new data */
|
|
|
680 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) {
|
|
|
681 surface->flags &= ~SDL_RLEACCEL; /* stop lying */
|
|
|
682 SDL_RLESurface(surface);
|
|
|
683 }
|
|
|
684 }
|
|
|
685 }
|
|
|
686
|
|
|
687 /*
|
|
|
688 * Convert a surface into the specified pixel format.
|
|
|
689 */
|
|
|
690 SDL_Surface * SDL_ConvertSurface (SDL_Surface *surface,
|
|
|
691 SDL_PixelFormat *format, Uint32 flags)
|
|
|
692 {
|
|
|
693 SDL_Surface *convert;
|
|
|
694 Uint32 colorkey = 0;
|
|
|
695 Uint8 alpha = 0;
|
|
|
696 Uint32 surface_flags;
|
|
|
697 SDL_Rect bounds;
|
|
|
698
|
|
|
699 /* Check for empty destination palette! (results in empty image) */
|
|
|
700 if ( format->palette != NULL ) {
|
|
|
701 int i;
|
|
|
702 for ( i=0; i<format->palette->ncolors; ++i ) {
|
|
|
703 if ( (format->palette->colors[i].r != 0) ||
|
|
|
704 (format->palette->colors[i].g != 0) ||
|
|
|
705 (format->palette->colors[i].b != 0) )
|
|
|
706 break;
|
|
|
707 }
|
|
|
708 if ( i == format->palette->ncolors ) {
|
|
|
709 SDL_SetError("Empty destination palette");
|
|
|
710 return(NULL);
|
|
|
711 }
|
|
|
712 }
|
|
|
713
|
|
|
714 /* Create a new surface with the desired format */
|
|
|
715 convert = SDL_CreateRGBSurface(flags,
|
|
|
716 surface->w, surface->h, format->BitsPerPixel,
|
|
|
717 format->Rmask, format->Gmask, format->Bmask, format->Amask);
|
|
|
718 if ( convert == NULL ) {
|
|
|
719 return(NULL);
|
|
|
720 }
|
|
|
721
|
|
|
722 /* Copy the palette if any */
|
|
|
723 if ( format->palette && convert->format->palette ) {
|
|
|
724 memcpy(convert->format->palette->colors,
|
|
|
725 format->palette->colors,
|
|
|
726 format->palette->ncolors*sizeof(SDL_Color));
|
|
|
727 convert->format->palette->ncolors = format->palette->ncolors;
|
|
|
728 }
|
|
|
729
|
|
|
730 /* Save the original surface color key and alpha */
|
|
|
731 surface_flags = surface->flags;
|
|
|
732 if ( (surface_flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY ) {
|
|
|
733 /* Convert colourkeyed surfaces to RGBA if requested */
|
|
|
734 if((flags & SDL_SRCCOLORKEY) != SDL_SRCCOLORKEY
|
|
|
735 && format->Amask) {
|
|
|
736 surface_flags &= ~SDL_SRCCOLORKEY;
|
|
|
737 } else {
|
|
|
738 colorkey = surface->format->colorkey;
|
|
|
739 SDL_SetColorKey(surface, 0, 0);
|
|
|
740 }
|
|
|
741 }
|
|
|
742 if ( (surface_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) {
|
|
|
743 alpha = surface->format->alpha;
|
|
|
744 SDL_SetAlpha(surface, 0, 0);
|
|
|
745 }
|
|
|
746
|
|
|
747 /* Copy over the image data */
|
|
|
748 bounds.x = 0;
|
|
|
749 bounds.y = 0;
|
|
|
750 bounds.w = surface->w;
|
|
|
751 bounds.h = surface->h;
|
|
|
752 SDL_LowerBlit(surface, &bounds, convert, &bounds);
|
|
|
753
|
|
|
754 /* Clean up the original surface, and update converted surface */
|
|
|
755 if ( convert != NULL ) {
|
|
|
756 SDL_SetClipRect(convert, &surface->clip_rect);
|
|
|
757 }
|
|
|
758 if ( (surface_flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY ) {
|
|
|
759 Uint32 cflags = surface_flags&(SDL_SRCCOLORKEY|SDL_RLEACCELOK);
|
|
|
760 if ( convert != NULL ) {
|
|
|
761 Uint8 keyR, keyG, keyB;
|
|
|
762
|
|
|
763 SDL_GetRGB(colorkey,surface->format,&keyR,&keyG,&keyB);
|
|
|
764 SDL_SetColorKey(convert, cflags|(flags&SDL_RLEACCELOK),
|
|
|
765 SDL_MapRGB(convert->format, keyR, keyG, keyB));
|
|
|
766 }
|
|
|
767 SDL_SetColorKey(surface, cflags, colorkey);
|
|
|
768 }
|
|
|
769 if ( (surface_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) {
|
|
|
770 Uint32 aflags = surface_flags&(SDL_SRCALPHA|SDL_RLEACCELOK);
|
|
|
771 if ( convert != NULL ) {
|
|
|
772 SDL_SetAlpha(convert, aflags|(flags&SDL_RLEACCELOK),
|
|
|
773 alpha);
|
|
|
774 }
|
|
|
775 SDL_SetAlpha(surface, aflags, alpha);
|
|
|
776 }
|
|
|
777
|
|
|
778 /* We're ready to go! */
|
|
|
779 return(convert);
|
|
|
780 }
|
|
|
781
|
|
|
782 /*
|
|
|
783 * Free a surface created by the above function.
|
|
|
784 */
|
|
|
785 void SDL_FreeSurface (SDL_Surface *surface)
|
|
|
786 {
|
|
|
787 /* Free anything that's not NULL, and not the screen surface */
|
|
|
788 if ((surface == NULL) ||
|
|
|
789 (current_video &&
|
|
|
790 ((surface == SDL_ShadowSurface)||(surface == SDL_VideoSurface)))) {
|
|
|
791 return;
|
|
|
792 }
|
|
|
793 if ( --surface->refcount > 0 ) {
|
|
|
794 return;
|
|
|
795 }
|
|
|
796 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) {
|
|
|
797 SDL_UnRLESurface(surface, 0);
|
|
|
798 }
|
|
|
799 if ( surface->format ) {
|
|
|
800 SDL_FreeFormat(surface->format);
|
|
|
801 surface->format = NULL;
|
|
|
802 }
|
|
|
803 if ( surface->map != NULL ) {
|
|
|
804 SDL_FreeBlitMap(surface->map);
|
|
|
805 surface->map = NULL;
|
|
|
806 }
|
|
|
807 if ( (surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) {
|
|
|
808 SDL_VideoDevice *video = current_video;
|
|
|
809 SDL_VideoDevice *this = current_video;
|
|
|
810 video->FreeHWSurface(this, surface);
|
|
|
811 }
|
|
|
812 if ( surface->pixels &&
|
|
|
813 ((surface->flags & SDL_PREALLOC) != SDL_PREALLOC) ) {
|
|
|
814 free(surface->pixels);
|
|
|
815 }
|
|
|
816 free(surface);
|
|
|
817 #ifdef CHECK_LEAKS
|
|
|
818 --surfaces_allocated;
|
|
|
819 #endif
|
|
|
820 }
|
