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annotate src/video/dummy/SDL_nullrender.c @ 2227:b252359547ed

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Exported the software renderer texture functions to make easier to create a renderer based on a framebuffer. Fixed an initialization bug with the dummy video display mode.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 11 Aug 2007 23:26:03 +0000
parents 7387e0514595
children bb67fd5ccfdb
rev   line source
1895
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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_yuv_sw_c.h"
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27 #include "../SDL_rendercopy.h"
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28
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29
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30 /* SDL surface based renderer implementation */
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31
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32 static SDL_Renderer *SDL_DUMMY_CreateRenderer(SDL_Window * window,
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33 Uint32 flags);
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34 static int SDL_DUMMY_RenderFill(SDL_Renderer * renderer, Uint8 r, Uint8 g,
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35 Uint8 b, Uint8 a, const SDL_Rect * rect);
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36 static int SDL_DUMMY_RenderCopy(SDL_Renderer * renderer,
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37 SDL_Texture * texture,
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38 const SDL_Rect * srcrect,
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39 const SDL_Rect * dstrect);
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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 "dummy",
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48 (SDL_RENDERER_SINGLEBUFFER | SDL_RENDERER_PRESENTCOPY |
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49 SDL_RENDERER_PRESENTFLIP2 | SDL_RENDERER_PRESENTFLIP3 |
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50 SDL_RENDERER_PRESENTDISCARD),
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51 }
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52 };
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53
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54 typedef struct
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55 {
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56 int current_screen;
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57 SDL_Surface *screens[3];
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58 } SDL_DUMMY_RenderData;
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59
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60 SDL_Renderer *
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61 SDL_DUMMY_CreateRenderer(SDL_Window * window, Uint32 flags)
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62 {
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63 SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
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64 SDL_DisplayMode *displayMode = &display->current_mode;
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65 SDL_Renderer *renderer;
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66 SDL_DUMMY_RenderData *data;
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67 int i, n;
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68 int bpp;
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69 Uint32 Rmask, Gmask, Bmask, Amask;
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70
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71 if (!SDL_PixelFormatEnumToMasks
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72 (displayMode->format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
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73 SDL_SetError("Unknown display format");
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74 return NULL;
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75 }
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76
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77 renderer = (SDL_Renderer *) SDL_calloc(1, sizeof(*renderer));
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78 if (!renderer) {
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79 SDL_OutOfMemory();
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80 return NULL;
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81 }
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82
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83 data = (SDL_DUMMY_RenderData *) SDL_malloc(sizeof(*data));
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84 if (!data) {
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85 SDL_DUMMY_DestroyRenderer(renderer);
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86 SDL_OutOfMemory();
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87 return NULL;
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88 }
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89 SDL_zerop(data);
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90
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91 renderer->RenderFill = SDL_DUMMY_RenderFill;
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92 renderer->RenderCopy = SDL_DUMMY_RenderCopy;
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93 renderer->RenderPresent = SDL_DUMMY_RenderPresent;
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94 renderer->DestroyRenderer = SDL_DUMMY_DestroyRenderer;
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95 renderer->info.name = SDL_DUMMY_RenderDriver.info.name;
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96 renderer->info.flags = 0;
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97 renderer->window = window->id;
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98 renderer->driverdata = data;
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99 Setup_SoftwareRenderer(renderer);
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100
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101 if (flags & SDL_RENDERER_PRESENTFLIP2) {
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102 renderer->info.flags |= SDL_RENDERER_PRESENTFLIP2;
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103 n = 2;
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104 } else if (flags & SDL_RENDERER_PRESENTFLIP3) {
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105 renderer->info.flags |= SDL_RENDERER_PRESENTFLIP3;
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106 n = 3;
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107 } else {
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108 renderer->info.flags |= SDL_RENDERER_PRESENTCOPY;
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109 n = 1;
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110 }
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111 for (i = 0; i < n; ++i) {
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112 data->screens[i] =
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113 SDL_CreateRGBSurface(0, window->w, window->h, bpp, Rmask, Gmask,
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114 Bmask, Amask);
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115 if (!data->screens[i]) {
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116 SDL_DUMMY_DestroyRenderer(renderer);
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117 return NULL;
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118 }
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119 SDL_SetSurfacePalette(data->screens[i], display->palette);
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120 }
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121 data->current_screen = 0;
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122
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123 return renderer;
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124 }
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125
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126 static int
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127 SDL_DUMMY_RenderFill(SDL_Renderer * renderer, Uint8 r, Uint8 g, Uint8 b,
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128 Uint8 a, const SDL_Rect * rect)
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129 {
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130 SDL_DUMMY_RenderData *data =
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131 (SDL_DUMMY_RenderData *) renderer->driverdata;
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132 SDL_Surface *target = data->screens[data->current_screen];
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133 Uint32 color;
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diff changeset
134 SDL_Rect real_rect = *rect;
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135
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diff changeset
136 color = SDL_MapRGBA(target->format, r, g, b, a);
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137
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138 return SDL_FillRect(target, &real_rect, color);
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139 }
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diff changeset
140
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diff changeset
141 static int
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142 SDL_DUMMY_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
1985
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143 const SDL_Rect * srcrect, const SDL_Rect * dstrect)
1908
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144 {
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145 SDL_DUMMY_RenderData *data =
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146 (SDL_DUMMY_RenderData *) renderer->driverdata;
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147 SDL_Window *window = SDL_GetWindowFromID(renderer->window);
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148 SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
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149
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150 if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
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151 SDL_Surface *target = data->screens[data->current_screen];
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152 void *pixels =
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153 (Uint8 *) target->pixels + dstrect->y * target->pitch +
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154 dstrect->x * target->format->BytesPerPixel;
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155 return SDL_SW_CopyYUVToRGB((SDL_SW_YUVTexture *) texture->driverdata,
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156 srcrect, display->current_mode.format,
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157 dstrect->w, dstrect->h, pixels,
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158 target->pitch);
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159 } else {
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160 SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
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diff changeset
161 SDL_Surface *target = data->screens[data->current_screen];
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162 SDL_RenderCopyFunc copyfunc = (SDL_RenderCopyFunc) surface->userdata;
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163
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164 if (copyfunc) {
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165 SDL_RenderCopyData copydata;
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166
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167 copydata.src =
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168 (Uint8 *) surface->pixels + srcrect->y * surface->pitch +
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169 srcrect->x * surface->format->BytesPerPixel;
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170 copydata.src_w = srcrect->w;
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171 copydata.src_h = srcrect->h;
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172 copydata.src_pitch = surface->pitch;
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173 copydata.dst =
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174 (Uint8 *) target->pixels + dstrect->y * target->pitch +
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175 dstrect->x * target->format->BytesPerPixel;
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176 copydata.dst_w = dstrect->w;
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177 copydata.dst_h = dstrect->h;
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178 copydata.dst_pitch = target->pitch;
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179 copydata.flags = 0;
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180 if (texture->modMode & SDL_TEXTUREMODULATE_COLOR) {
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181 copydata.flags |= SDL_RENDERCOPY_MODULATE_COLOR;
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182 copydata.r = texture->r;
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183 copydata.g = texture->g;
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184 copydata.b = texture->b;
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diff changeset
185 }
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186 if (texture->modMode & SDL_TEXTUREMODULATE_ALPHA) {
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187 copydata.flags |= SDL_RENDERCOPY_MODULATE_ALPHA;
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188 copydata.a = texture->a;
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diff changeset
189 }
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7b573c59cb1f The dummy renderer can task advantage of the MASK optimization too, though performance probably doesn't matter here...
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190 if (texture->blendMode & SDL_TEXTUREBLENDMODE_MASK) {
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diff changeset
191 copydata.flags |= SDL_RENDERCOPY_MASK;
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diff changeset
192 } else if (texture->blendMode & SDL_TEXTUREBLENDMODE_BLEND) {
1985
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193 copydata.flags |= SDL_RENDERCOPY_BLEND;
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diff changeset
194 } else if (texture->blendMode & SDL_TEXTUREBLENDMODE_ADD) {
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195 copydata.flags |= SDL_RENDERCOPY_ADD;
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diff changeset
196 } else if (texture->blendMode & SDL_TEXTUREBLENDMODE_MOD) {
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diff changeset
197 copydata.flags |= SDL_RENDERCOPY_MOD;
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198 }
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diff changeset
199 if (texture->scaleMode) {
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diff changeset
200 copydata.flags |= SDL_RENDERCOPY_NEAREST;
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diff changeset
201 }
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diff changeset
202 return copyfunc(&copydata);
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diff changeset
203 } else {
1985
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diff changeset
204 SDL_Rect real_srcrect = *srcrect;
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diff changeset
205 SDL_Rect real_dstrect = *dstrect;
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diff changeset
206
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diff changeset
207 return SDL_LowerBlit(surface, &real_srcrect, target,
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diff changeset
208 &real_dstrect);
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209 }
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diff changeset
210 }
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diff changeset
211 }
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diff changeset
212
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diff changeset
213 static void
1895
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parents:
diff changeset
214 SDL_DUMMY_RenderPresent(SDL_Renderer * renderer)
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parents:
diff changeset
215 {
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parents:
diff changeset
216 static int frame_number;
1912
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diff changeset
217 SDL_DUMMY_RenderData *data =
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diff changeset
218 (SDL_DUMMY_RenderData *) renderer->driverdata;
1895
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parents:
diff changeset
219
1908
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diff changeset
220 /* Send the data to the display */
1895
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parents:
diff changeset
221 if (SDL_getenv("SDL_VIDEO_DUMMY_SAVE_FRAMES")) {
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parents:
diff changeset
222 char file[128];
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parents:
diff changeset
223 SDL_snprintf(file, sizeof(file), "SDL_window%d-%8.8d.bmp",
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents:
diff changeset
224 renderer->window, ++frame_number);
1908
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diff changeset
225 SDL_SaveBMP(data->screens[data->current_screen], file);
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diff changeset
226 }
e079dafea2bf Implemented fully featured dummy renderer
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parents: 1907
diff changeset
227
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parents: 1907
diff changeset
228 /* Update the flipping chain, if any */
1965
a788656ca29a SDL constants are all uppercase.
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parents: 1912
diff changeset
229 if (renderer->info.flags & SDL_RENDERER_PRESENTFLIP2) {
1908
e079dafea2bf Implemented fully featured dummy renderer
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parents: 1907
diff changeset
230 data->current_screen = (data->current_screen + 1) % 2;
1965
a788656ca29a SDL constants are all uppercase.
Sam Lantinga <slouken@libsdl.org>
parents: 1912
diff changeset
231 } else if (renderer->info.flags & SDL_RENDERER_PRESENTFLIP3) {
1908
e079dafea2bf Implemented fully featured dummy renderer
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parents: 1907
diff changeset
232 data->current_screen = (data->current_screen + 1) % 3;
1895
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parents:
diff changeset
233 }
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parents:
diff changeset
234 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents:
diff changeset
235
1908
e079dafea2bf Implemented fully featured dummy renderer
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diff changeset
236 static void
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents:
diff changeset
237 SDL_DUMMY_DestroyRenderer(SDL_Renderer * renderer)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents:
diff changeset
238 {
1912
8d384b647307 Setting up the OpenGL support
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parents: 1908
diff changeset
239 SDL_DUMMY_RenderData *data =
8d384b647307 Setting up the OpenGL support
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parents: 1908
diff changeset
240 (SDL_DUMMY_RenderData *) renderer->driverdata;
1908
e079dafea2bf Implemented fully featured dummy renderer
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parents: 1907
diff changeset
241 int i;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
242
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
243 if (data) {
1908
e079dafea2bf Implemented fully featured dummy renderer
Sam Lantinga <slouken@libsdl.org>
parents: 1907
diff changeset
244 for (i = 0; i < SDL_arraysize(data->screens); ++i) {
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parents: 1907
diff changeset
245 if (data->screens[i]) {
e079dafea2bf Implemented fully featured dummy renderer
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parents: 1907
diff changeset
246 SDL_FreeSurface(data->screens[i]);
e079dafea2bf Implemented fully featured dummy renderer
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parents: 1907
diff changeset
247 }
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents:
diff changeset
248 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
249 SDL_free(data);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
250 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
251 SDL_free(renderer);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
252 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
253
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
254 /* vi: set ts=4 sw=4 expandtab: */