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annotate src/video/dummy/SDL_nullvideo.c @ 4269:60db3d01cb3a SDL-1.2

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I just tested DGA mouse motion with X.org 1.6.0 and it's working fine, with evdev and the G5 mouse. It's not creating a ton of events here.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 30 Sep 2009 04:49:57 +0000
parents a1b03ba2fcd0
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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 /* Dummy SDL video driver implementation; this is just enough to make an
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25 * SDL-based application THINK it's got a working video driver, for
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26 * applications that call SDL_Init(SDL_INIT_VIDEO) when they don't need it,
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27 * and also for use as a collection of stubs when porting SDL to a new
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28 * platform for which you haven't yet written a valid video driver.
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29 *
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30 * This is also a great way to determine bottlenecks: if you think that SDL
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31 * is a performance problem for a given platform, enable this driver, and
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32 * then see if your application runs faster without video overhead.
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33 *
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34 * Initial work by Ryan C. Gordon (icculus@icculus.org). A good portion
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35 * of this was cut-and-pasted from Stephane Peter's work in the AAlib
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36 * SDL video driver. Renamed to "DUMMY" by Sam Lantinga.
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37 */
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38
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39 #include "SDL_video.h"
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40 #include "SDL_mouse.h"
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41 #include "../SDL_sysvideo.h"
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42 #include "../SDL_pixels_c.h"
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43 #include "../../events/SDL_events_c.h"
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44
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45 #include "SDL_nullvideo.h"
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46 #include "SDL_nullevents_c.h"
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47 #include "SDL_nullmouse_c.h"
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48
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49 #define DUMMYVID_DRIVER_NAME "dummy"
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50
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51 /* Initialization/Query functions */
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52 static int DUMMY_VideoInit(_THIS, SDL_PixelFormat *vformat);
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53 static SDL_Rect **DUMMY_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags);
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54 static SDL_Surface *DUMMY_SetVideoMode(_THIS, SDL_Surface *current, int width, int height, int bpp, Uint32 flags);
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55 static int DUMMY_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors);
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56 static void DUMMY_VideoQuit(_THIS);
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57
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58 /* Hardware surface functions */
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59 static int DUMMY_AllocHWSurface(_THIS, SDL_Surface *surface);
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60 static int DUMMY_LockHWSurface(_THIS, SDL_Surface *surface);
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61 static void DUMMY_UnlockHWSurface(_THIS, SDL_Surface *surface);
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62 static void DUMMY_FreeHWSurface(_THIS, SDL_Surface *surface);
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63
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64 /* etc. */
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65 static void DUMMY_UpdateRects(_THIS, int numrects, SDL_Rect *rects);
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66
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67 /* DUMMY driver bootstrap functions */
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68
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69 static int DUMMY_Available(void)
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70 {
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71 const char *envr = SDL_getenv("SDL_VIDEODRIVER");
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72 if ((envr) && (SDL_strcmp(envr, DUMMYVID_DRIVER_NAME) == 0)) {
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73 return(1);
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74 }
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75
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76 return(0);
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77 }
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78
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79 static void DUMMY_DeleteDevice(SDL_VideoDevice *device)
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80 {
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81 SDL_free(device->hidden);
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82 SDL_free(device);
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83 }
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84
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85 static SDL_VideoDevice *DUMMY_CreateDevice(int devindex)
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86 {
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87 SDL_VideoDevice *device;
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88
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89 /* Initialize all variables that we clean on shutdown */
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90 device = (SDL_VideoDevice *)SDL_malloc(sizeof(SDL_VideoDevice));
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91 if ( device ) {
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92 SDL_memset(device, 0, (sizeof *device));
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93 device->hidden = (struct SDL_PrivateVideoData *)
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94 SDL_malloc((sizeof *device->hidden));
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95 }
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96 if ( (device == NULL) || (device->hidden == NULL) ) {
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97 SDL_OutOfMemory();
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98 if ( device ) {
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99 SDL_free(device);
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100 }
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101 return(0);
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102 }
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103 SDL_memset(device->hidden, 0, (sizeof *device->hidden));
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104
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105 /* Set the function pointers */
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106 device->VideoInit = DUMMY_VideoInit;
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107 device->ListModes = DUMMY_ListModes;
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108 device->SetVideoMode = DUMMY_SetVideoMode;
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109 device->CreateYUVOverlay = NULL;
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110 device->SetColors = DUMMY_SetColors;
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111 device->UpdateRects = DUMMY_UpdateRects;
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112 device->VideoQuit = DUMMY_VideoQuit;
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113 device->AllocHWSurface = DUMMY_AllocHWSurface;
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114 device->CheckHWBlit = NULL;
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115 device->FillHWRect = NULL;
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116 device->SetHWColorKey = NULL;
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117 device->SetHWAlpha = NULL;
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118 device->LockHWSurface = DUMMY_LockHWSurface;
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119 device->UnlockHWSurface = DUMMY_UnlockHWSurface;
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120 device->FlipHWSurface = NULL;
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121 device->FreeHWSurface = DUMMY_FreeHWSurface;
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122 device->SetCaption = NULL;
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123 device->SetIcon = NULL;
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124 device->IconifyWindow = NULL;
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125 device->GrabInput = NULL;
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126 device->GetWMInfo = NULL;
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127 device->InitOSKeymap = DUMMY_InitOSKeymap;
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128 device->PumpEvents = DUMMY_PumpEvents;
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129
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130 device->free = DUMMY_DeleteDevice;
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131
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132 return device;
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133 }
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134
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135 VideoBootStrap DUMMY_bootstrap = {
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136 DUMMYVID_DRIVER_NAME, "SDL dummy video driver",
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137 DUMMY_Available, DUMMY_CreateDevice
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138 };
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139
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140
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141 int DUMMY_VideoInit(_THIS, SDL_PixelFormat *vformat)
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142 {
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143 /*
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144 fprintf(stderr, "WARNING: You are using the SDL dummy video driver!\n");
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145 */
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146
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147 /* Determine the screen depth (use default 8-bit depth) */
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148 /* we change this during the SDL_SetVideoMode implementation... */
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149 vformat->BitsPerPixel = 8;
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150 vformat->BytesPerPixel = 1;
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151
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152 /* We're done! */
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153 return(0);
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154 }
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155
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156 SDL_Rect **DUMMY_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags)
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157 {
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158 return (SDL_Rect **) -1;
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159 }
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160
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161 SDL_Surface *DUMMY_SetVideoMode(_THIS, SDL_Surface *current,
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162 int width, int height, int bpp, Uint32 flags)
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163 {
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164 if ( this->hidden->buffer ) {
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165 SDL_free( this->hidden->buffer );
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166 }
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167
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168 this->hidden->buffer = SDL_malloc(width * height * (bpp / 8));
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169 if ( ! this->hidden->buffer ) {
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170 SDL_SetError("Couldn't allocate buffer for requested mode");
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171 return(NULL);
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172 }
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173
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174 /* printf("Setting mode %dx%d\n", width, height); */
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175
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176 SDL_memset(this->hidden->buffer, 0, width * height * (bpp / 8));
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177
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178 /* Allocate the new pixel format for the screen */
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179 if ( ! SDL_ReallocFormat(current, bpp, 0, 0, 0, 0) ) {
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180 SDL_free(this->hidden->buffer);
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181 this->hidden->buffer = NULL;
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182 SDL_SetError("Couldn't allocate new pixel format for requested mode");
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183 return(NULL);
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184 }
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185
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186 /* Set up the new mode framebuffer */
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187 current->flags = flags & SDL_FULLSCREEN;
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188 this->hidden->w = current->w = width;
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189 this->hidden->h = current->h = height;
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190 current->pitch = current->w * (bpp / 8);
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191 current->pixels = this->hidden->buffer;
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192
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193 /* We're done */
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194 return(current);
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195 }
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196
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197 /* We don't actually allow hardware surfaces other than the main one */
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198 static int DUMMY_AllocHWSurface(_THIS, SDL_Surface *surface)
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199 {
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200 return(-1);
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201 }
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202 static void DUMMY_FreeHWSurface(_THIS, SDL_Surface *surface)
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203 {
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204 return;
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205 }
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206
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207 /* We need to wait for vertical retrace on page flipped displays */
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208 static int DUMMY_LockHWSurface(_THIS, SDL_Surface *surface)
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209 {
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210 return(0);
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211 }
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212
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213 static void DUMMY_UnlockHWSurface(_THIS, SDL_Surface *surface)
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214 {
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215 return;
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216 }
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217
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218 static void DUMMY_UpdateRects(_THIS, int numrects, SDL_Rect *rects)
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219 {
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220 /* do nothing. */
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221 }
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222
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223 int DUMMY_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors)
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224 {
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225 /* do nothing of note. */
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226 return(1);
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227 }
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228
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229 /* Note: If we are terminated, this could be called in the middle of
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230 another SDL video routine -- notably UpdateRects.
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231 */
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232 void DUMMY_VideoQuit(_THIS)
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233 {
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234 if (this->screen->pixels != NULL)
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235 {
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236 SDL_free(this->screen->pixels);
1
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237 this->screen->pixels = NULL;
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238 }
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239 }