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annotate src/video/dummy/SDL_nullrender.c @ 1720:a1ebb17f9c52 SDL-1.3

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Cleaned up a bunch of warnings, started adding Win32 event support
author Sam Lantinga <slouken@libsdl.org>
date Fri, 30 Jun 2006 05:42:49 +0000
parents 1577404809f0
children
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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
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27
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28 /* SDL surface based renderer implementation */
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29
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30 static SDL_Renderer *SDL_DUMMY_CreateRenderer(SDL_Window * window,
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31 Uint32 flags);
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32 static int SDL_DUMMY_CreateTexture(SDL_Renderer * renderer,
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33 SDL_Texture * texture);
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34 static int SDL_DUMMY_RenderReadPixels(SDL_Renderer * renderer,
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35 const SDL_Rect * rect, void *pixels,
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36 int pitch);
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37 static int SDL_DUMMY_RenderWritePixels(SDL_Renderer * renderer,
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38 const SDL_Rect * rect,
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39 const void *pixels, int pitch);
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40 static void SDL_DUMMY_RenderPresent(SDL_Renderer * renderer);
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41 static void SDL_DUMMY_DestroyRenderer(SDL_Renderer * renderer);
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42
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43
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44 SDL_RenderDriver SDL_DUMMY_RenderDriver = {
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45 SDL_DUMMY_CreateRenderer,
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46 {
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47 "minimal",
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48 (SDL_Renderer_Minimal | SDL_Renderer_PresentDiscard |
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49 SDL_Renderer_PresentCopy),
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50 SDL_TextureBlendMode_None,
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51 SDL_TextureScaleMode_None,
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52 0,
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53 {0},
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54 0,
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55 0}
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56 };
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57
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58 typedef struct
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59 {
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60 SDL_Surface *surface;
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61 } SDL_DUMMY_RenderData;
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62
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63 SDL_Renderer *
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64 SDL_DUMMY_CreateRenderer(SDL_Window * window, Uint32 flags)
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65 {
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66 SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
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67 SDL_DisplayMode *displayMode = &display->current_mode;
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68 SDL_Renderer *renderer;
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69 SDL_DUMMY_RenderData *data;
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70 int bpp;
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71 Uint32 Rmask, Gmask, Bmask, Amask;
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72
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73 if (!SDL_PixelFormatEnumToMasks
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74 (displayMode->format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
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75 SDL_SetError("Unknown display format");
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76 return NULL;
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77 }
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78
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79 renderer = (SDL_Renderer *) SDL_malloc(sizeof(*renderer));
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80 if (!renderer) {
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81 SDL_OutOfMemory();
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82 return NULL;
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83 }
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84 SDL_zerop(renderer);
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85
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86 data = (SDL_DUMMY_RenderData *) SDL_malloc(sizeof(*data));
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87 if (!data) {
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88 SDL_DUMMY_DestroyRenderer(renderer);
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89 SDL_OutOfMemory();
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90 return NULL;
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91 }
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92 SDL_zerop(data);
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93
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94 renderer->RenderReadPixels = SDL_DUMMY_RenderReadPixels;
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95 renderer->RenderWritePixels = SDL_DUMMY_RenderWritePixels;
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96 renderer->RenderPresent = SDL_DUMMY_RenderPresent;
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97 renderer->DestroyRenderer = SDL_DUMMY_DestroyRenderer;
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98 renderer->info = SDL_DUMMY_RenderDriver.info;
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99 renderer->window = window->id;
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100 renderer->driverdata = data;
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101
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102 data->surface =
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103 SDL_CreateRGBSurface(0, window->w, window->h, bpp, Rmask, Gmask,
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104 Bmask, Amask);
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105 if (!data->surface) {
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106 SDL_DUMMY_DestroyRenderer(renderer);
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107 return NULL;
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108 }
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109 SDL_SetSurfacePalette(data->surface, display->palette);
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110
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111 return renderer;
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112 }
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113
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114 int
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115 SDL_DUMMY_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
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116 void *pixels, int pitch)
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117 {
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118 SDL_DUMMY_RenderData *data =
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119 (SDL_DUMMY_RenderData *) renderer->driverdata;
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120 SDL_Surface *surface = data->surface;
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121 Uint8 *src, *dst;
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122 int row;
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123 size_t length;
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124
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125 src =
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126 (Uint8 *) surface->pixels + rect->y * surface->pitch +
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127 rect->x * surface->format->BytesPerPixel;
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128 dst = (Uint8 *) pixels;
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129 length = rect->w * surface->format->BytesPerPixel;
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130 for (row = 0; row < rect->h; ++row) {
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131 SDL_memcpy(dst, src, length);
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132 src += surface->pitch;
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133 dst += pitch;
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134 }
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135 return 0;
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136 }
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137
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138 int
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139 SDL_DUMMY_RenderWritePixels(SDL_Renderer * renderer, const SDL_Rect * rect,
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140 const void *pixels, int pitch)
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141 {
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142 SDL_DUMMY_RenderData *data =
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143 (SDL_DUMMY_RenderData *) renderer->driverdata;
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144 SDL_Surface *surface = data->surface;
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145 Uint8 *src, *dst;
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146 int row;
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147 size_t length;
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148
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149 src = (Uint8 *) pixels;
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150 dst =
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151 (Uint8 *) surface->pixels + rect->y * surface->pitch +
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152 rect->x * surface->format->BytesPerPixel;
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153 length = rect->w * surface->format->BytesPerPixel;
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154 for (row = 0; row < rect->h; ++row) {
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155 SDL_memcpy(dst, src, length);
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156 src += pitch;
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157 dst += surface->pitch;
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158 }
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159 return 0;
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160 }
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161
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162 void
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163 SDL_DUMMY_RenderPresent(SDL_Renderer * renderer)
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164 {
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165 static int frame_number;
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166 SDL_DUMMY_RenderData *data =
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167 (SDL_DUMMY_RenderData *) renderer->driverdata;
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168 SDL_Surface *surface = data->surface;
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169
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170 if (SDL_getenv("SDL_VIDEO_DUMMY_SAVE_FRAMES")) {
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171 char file[128];
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172 SDL_snprintf(file, sizeof(file), "SDL_window%d-%8.8d.bmp",
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173 renderer->window, ++frame_number);
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174 SDL_SaveBMP(surface, file);
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175 }
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176 }
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177
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178 void
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179 SDL_DUMMY_DestroyRenderer(SDL_Renderer * renderer)
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180 {
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181 SDL_DUMMY_RenderData *data =
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182 (SDL_DUMMY_RenderData *) renderer->driverdata;
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183
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184 if (data) {
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185 if (data->surface) {
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186 data->surface->format->palette = NULL;
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187 SDL_FreeSurface(data->surface);
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188 }
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189 SDL_free(data);
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190 }
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191 SDL_free(renderer);
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192 }
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193
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194 /* vi: set ts=4 sw=4 expandtab: */