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annotate src/video/dummy/SDL_nullvideo.c @ 1312:c9b51268668f

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Updated copyright information and removed rcs id lines (problematic in branch merges) I batch edited these files, so please let me know if I've accidentally removed anybody's credit here.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 01 Feb 2006 06:32:25 +0000
parents b8d311d90021
children 3692456e7b0f
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
1
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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
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23 /* Dummy SDL video driver implementation; this is just enough to make an
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24 * SDL-based application THINK it's got a working video driver, for
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25 * applications that call SDL_Init(SDL_INIT_VIDEO) when they don't need it,
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26 * and also for use as a collection of stubs when porting SDL to a new
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27 * platform for which you haven't yet written a valid video driver.
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28 *
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29 * This is also a great way to determine bottlenecks: if you think that SDL
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30 * is a performance problem for a given platform, enable this driver, and
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31 * then see if your application runs faster without video overhead.
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32 *
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33 * Initial work by Ryan C. Gordon (icculus@linuxgames.com). A good portion
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34 * of this was cut-and-pasted from Stephane Peter's work in the AAlib
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35 * SDL video driver. Renamed to "DUMMY" by Sam Lantinga.
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36 */
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37
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38 #include <stdio.h>
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39 #include <stdlib.h>
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40 #include <string.h>
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41
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42 #include "SDL.h"
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43 #include "SDL_error.h"
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44 #include "SDL_video.h"
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45 #include "SDL_mouse.h"
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46 #include "SDL_sysvideo.h"
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47 #include "SDL_pixels_c.h"
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48 #include "SDL_events_c.h"
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49
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50 #include "SDL_nullvideo.h"
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51 #include "SDL_nullevents_c.h"
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52 #include "SDL_nullmouse_c.h"
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53
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54 #define DUMMYVID_DRIVER_NAME "dummy"
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55
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56 /* Initialization/Query functions */
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57 static int DUMMY_VideoInit(_THIS, SDL_PixelFormat *vformat);
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58 static SDL_Rect **DUMMY_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags);
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59 static SDL_Surface *DUMMY_SetVideoMode(_THIS, SDL_Surface *current, int width, int height, int bpp, Uint32 flags);
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60 static int DUMMY_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors);
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61 static void DUMMY_VideoQuit(_THIS);
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62
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63 /* Hardware surface functions */
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64 static int DUMMY_AllocHWSurface(_THIS, SDL_Surface *surface);
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65 static int DUMMY_LockHWSurface(_THIS, SDL_Surface *surface);
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66 static void DUMMY_UnlockHWSurface(_THIS, SDL_Surface *surface);
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67 static void DUMMY_FreeHWSurface(_THIS, SDL_Surface *surface);
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68
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69 /* etc. */
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70 static void DUMMY_UpdateRects(_THIS, int numrects, SDL_Rect *rects);
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71
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72 /* DUMMY driver bootstrap functions */
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73
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74 static int DUMMY_Available(void)
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75 {
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76 const char *envr = getenv("SDL_VIDEODRIVER");
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77 if ((envr) && (strcmp(envr, DUMMYVID_DRIVER_NAME) == 0)) {
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78 return(1);
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79 }
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80
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81 return(0);
1
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82 }
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83
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84 static void DUMMY_DeleteDevice(SDL_VideoDevice *device)
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85 {
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86 free(device->hidden);
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87 free(device);
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88 }
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89
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90 static SDL_VideoDevice *DUMMY_CreateDevice(int devindex)
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91 {
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92 SDL_VideoDevice *device;
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93
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94 /* Initialize all variables that we clean on shutdown */
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95 device = (SDL_VideoDevice *)malloc(sizeof(SDL_VideoDevice));
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96 if ( device ) {
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97 memset(device, 0, (sizeof *device));
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98 device->hidden = (struct SDL_PrivateVideoData *)
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99 malloc((sizeof *device->hidden));
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100 }
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101 if ( (device == NULL) || (device->hidden == NULL) ) {
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102 SDL_OutOfMemory();
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103 if ( device ) {
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104 free(device);
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105 }
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106 return(0);
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107 }
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108 memset(device->hidden, 0, (sizeof *device->hidden));
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109
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110 /* Set the function pointers */
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111 device->VideoInit = DUMMY_VideoInit;
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112 device->ListModes = DUMMY_ListModes;
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113 device->SetVideoMode = DUMMY_SetVideoMode;
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114 device->CreateYUVOverlay = NULL;
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115 device->SetColors = DUMMY_SetColors;
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116 device->UpdateRects = DUMMY_UpdateRects;
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117 device->VideoQuit = DUMMY_VideoQuit;
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118 device->AllocHWSurface = DUMMY_AllocHWSurface;
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119 device->CheckHWBlit = NULL;
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120 device->FillHWRect = NULL;
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121 device->SetHWColorKey = NULL;
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122 device->SetHWAlpha = NULL;
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123 device->LockHWSurface = DUMMY_LockHWSurface;
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124 device->UnlockHWSurface = DUMMY_UnlockHWSurface;
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125 device->FlipHWSurface = NULL;
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126 device->FreeHWSurface = DUMMY_FreeHWSurface;
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127 device->SetCaption = NULL;
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128 device->SetIcon = NULL;
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129 device->IconifyWindow = NULL;
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130 device->GrabInput = NULL;
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131 device->GetWMInfo = NULL;
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132 device->InitOSKeymap = DUMMY_InitOSKeymap;
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133 device->PumpEvents = DUMMY_PumpEvents;
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134
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135 device->free = DUMMY_DeleteDevice;
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136
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137 return device;
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138 }
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139
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140 VideoBootStrap DUMMY_bootstrap = {
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141 DUMMYVID_DRIVER_NAME, "SDL dummy video driver",
1
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142 DUMMY_Available, DUMMY_CreateDevice
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143 };
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144
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145
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146 int DUMMY_VideoInit(_THIS, SDL_PixelFormat *vformat)
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147 {
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148 fprintf(stderr, "WARNING: You are using the SDL dummy video driver!\n");
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149
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150 /* Determine the screen depth (use default 8-bit depth) */
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151 /* we change this during the SDL_SetVideoMode implementation... */
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152 vformat->BitsPerPixel = 8;
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153 vformat->BytesPerPixel = 1;
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154
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155 /* We're done! */
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156 return(0);
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157 }
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158
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159 SDL_Rect **DUMMY_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags)
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160 {
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161 return (SDL_Rect **) -1;
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162 }
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163
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164 SDL_Surface *DUMMY_SetVideoMode(_THIS, SDL_Surface *current,
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165 int width, int height, int bpp, Uint32 flags)
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166 {
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167 if ( this->hidden->buffer ) {
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168 free( this->hidden->buffer );
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169 }
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170
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171 this->hidden->buffer = malloc(width * height * (bpp / 8));
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172 if ( ! this->hidden->buffer ) {
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173 SDL_SetError("Couldn't allocate buffer for requested mode");
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174 return(NULL);
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175 }
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176
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177 /* printf("Setting mode %dx%d\n", width, height); */
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178
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179 memset(this->hidden->buffer, 0, width * height * (bpp / 8));
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180
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181 /* Allocate the new pixel format for the screen */
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182 if ( ! SDL_ReallocFormat(current, bpp, 0, 0, 0, 0) ) {
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183 free(this->hidden->buffer);
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184 this->hidden->buffer = NULL;
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185 SDL_SetError("Couldn't allocate new pixel format for requested mode");
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186 return(NULL);
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187 }
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188
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189 /* Set up the new mode framebuffer */
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190 current->flags = flags & SDL_FULLSCREEN;
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191 this->hidden->w = current->w = width;
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192 this->hidden->h = current->h = height;
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193 current->pitch = current->w * (bpp / 8);
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194 current->pixels = this->hidden->buffer;
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195
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196 /* We're done */
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197 return(current);
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198 }
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199
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200 /* We don't actually allow hardware surfaces other than the main one */
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201 static int DUMMY_AllocHWSurface(_THIS, SDL_Surface *surface)
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202 {
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203 return(-1);
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204 }
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205 static void DUMMY_FreeHWSurface(_THIS, SDL_Surface *surface)
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206 {
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207 return;
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208 }
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209
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210 /* We need to wait for vertical retrace on page flipped displays */
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211 static int DUMMY_LockHWSurface(_THIS, SDL_Surface *surface)
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212 {
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213 return(0);
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214 }
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215
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216 static void DUMMY_UnlockHWSurface(_THIS, SDL_Surface *surface)
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217 {
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218 return;
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219 }
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220
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221 static void DUMMY_UpdateRects(_THIS, int numrects, SDL_Rect *rects)
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222 {
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223 /* do nothing. */
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224 }
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225
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226 int DUMMY_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors)
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227 {
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228 /* do nothing of note. */
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229 return(1);
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230 }
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231
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232 /* Note: If we are terminated, this could be called in the middle of
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233 another SDL video routine -- notably UpdateRects.
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234 */
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235 void DUMMY_VideoQuit(_THIS)
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236 {
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237 if (this->screen->pixels != NULL)
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238 {
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239 free(this->screen->pixels);
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240 this->screen->pixels = NULL;
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241 }
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242 }