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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 <stdlib.h>
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29 #include <stdio.h>
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30 #include <string.h>
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31
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32 #include <X11/Xlib.h>
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33 #include <X11/Xutil.h>
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34
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35 #include "SDL_error.h"
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36 #include "SDL_mouse.h"
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37 #include "SDL_events_c.h"
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38 #include "SDL_cursor_c.h"
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39 #include "SDL_x11dga_c.h"
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40 #include "SDL_x11mouse_c.h"
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41
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42
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43 /* The implementation dependent data for the window manager cursor */
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44 struct WMcursor {
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45 Cursor x_cursor;
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46 };
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47
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48
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49 void X11_FreeWMCursor(_THIS, WMcursor *cursor)
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50 {
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51 if ( SDL_Display != NULL ) {
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52 SDL_Lock_EventThread();
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53 XFreeCursor(SDL_Display, cursor->x_cursor);
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54 XSync(SDL_Display, False);
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55 SDL_Unlock_EventThread();
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56 }
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57 free(cursor);
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58 }
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59
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60 WMcursor *X11_CreateWMCursor(_THIS,
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61 Uint8 *data, Uint8 *mask, int w, int h, int hot_x, int hot_y)
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62 {
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63 WMcursor *cursor;
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64 XGCValues GCvalues;
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65 GC GCcursor;
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66 XImage *data_image, *mask_image;
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67 Pixmap data_pixmap, mask_pixmap;
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68 int clen, i;
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69 char *x_data, *x_mask;
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70 static XColor black = { 0, 0, 0, 0 };
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71 static XColor white = { 0xffff, 0xffff, 0xffff, 0xffff };
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72
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73 /* Allocate the cursor memory */
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74 cursor = (WMcursor *)malloc(sizeof(WMcursor));
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75 if ( cursor == NULL ) {
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76 SDL_OutOfMemory();
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77 return(NULL);
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78 }
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79
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80 /* Mix the mask and the data */
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81 clen = (w/8)*h;
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82 x_data = (char *)malloc(clen);
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83 if ( x_data == NULL ) {
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84 free(cursor);
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85 SDL_OutOfMemory();
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86 return(NULL);
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87 }
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88 x_mask = (char *)malloc(clen);
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89 if ( x_mask == NULL ) {
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90 free(cursor);
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91 free(x_data);
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92 SDL_OutOfMemory();
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93 return(NULL);
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94 }
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95 for ( i=0; i<clen; ++i ) {
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96 /* The mask is OR'd with the data to turn inverted color
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97 pixels black since inverted color cursors aren't supported
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98 under X11.
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99 */
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100 x_mask[i] = data[i] | mask[i];
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101 x_data[i] = data[i];
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102 }
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103
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104 /* Prevent the event thread from running while we use the X server */
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105 SDL_Lock_EventThread();
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106
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107 /* Create the data image */
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108 data_image = XCreateImage(SDL_Display,
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109 DefaultVisual(SDL_Display, SDL_Screen),
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110 1, XYBitmap, 0, x_data, w, h, 8, w/8);
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111 data_image->byte_order = MSBFirst;
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112 data_image->bitmap_bit_order = MSBFirst;
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113 data_pixmap = XCreatePixmap(SDL_Display, SDL_Root, w, h, 1);
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114
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115 /* Create the data mask */
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116 mask_image = XCreateImage(SDL_Display,
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117 DefaultVisual(SDL_Display, SDL_Screen),
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118 1, XYBitmap, 0, x_mask, w, h, 8, w/8);
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119 mask_image->byte_order = MSBFirst;
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120 mask_image->bitmap_bit_order = MSBFirst;
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121 mask_pixmap = XCreatePixmap(SDL_Display, SDL_Root, w, h, 1);
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122
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123 /* Create the graphics context */
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124 GCvalues.function = GXcopy;
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125 GCvalues.foreground = ~0;
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126 GCvalues.background = 0;
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127 GCvalues.plane_mask = AllPlanes;
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128 GCcursor = XCreateGC(SDL_Display, data_pixmap,
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129 (GCFunction|GCForeground|GCBackground|GCPlaneMask),
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130 &GCvalues);
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131
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132 /* Blit the images to the pixmaps */
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133 XPutImage(SDL_Display, data_pixmap, GCcursor, data_image,
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134 0, 0, 0, 0, w, h);
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135 XPutImage(SDL_Display, mask_pixmap, GCcursor, mask_image,
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136 0, 0, 0, 0, w, h);
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137 XFreeGC(SDL_Display, GCcursor);
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138 /* These free the x_data and x_mask memory pointers */
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139 XDestroyImage(data_image);
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140 XDestroyImage(mask_image);
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141
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142 /* Create the cursor */
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143 cursor->x_cursor = XCreatePixmapCursor(SDL_Display, data_pixmap,
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144 mask_pixmap, &black, &white, hot_x, hot_y);
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145
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146 /* Release the event thread */
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147 XSync(SDL_Display, False);
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148 SDL_Unlock_EventThread();
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149
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150 return(cursor);
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151 }
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152
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153 int X11_ShowWMCursor(_THIS, WMcursor *cursor)
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154 {
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155 /* Don't do anything if the display is gone */
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156 if ( SDL_Display == NULL ) {
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157 return(0);
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158 }
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159
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160 /* Set the X11 cursor cursor, or blank if cursor is NULL */
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161 if ( SDL_Window ) {
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162 SDL_Lock_EventThread();
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163 if ( cursor == NULL ) {
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164 if ( SDL_BlankCursor != NULL ) {
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165 XDefineCursor(SDL_Display, SDL_Window,
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166 SDL_BlankCursor->x_cursor);
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167 }
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168 } else {
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169 XDefineCursor(SDL_Display, SDL_Window, cursor->x_cursor);
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170 }
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171 XSync(SDL_Display, False);
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172 SDL_Unlock_EventThread();
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173 }
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174 return(1);
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175 }
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176
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177 void X11_WarpWMCursor(_THIS, Uint16 x, Uint16 y)
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178 {
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179 if ( using_dga & DGA_MOUSE ) {
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180 x += (this->screen->offset % this->screen->pitch) /
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181 this->screen->format->BytesPerPixel;
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182 y += (this->screen->offset / this->screen->pitch);
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183 SDL_PrivateMouseMotion(0, 0, x, y);
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184 } else {
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185 SDL_Lock_EventThread();
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186 XWarpPointer(SDL_Display, None, SDL_Window, 0, 0, 0, 0, x, y);
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187 XSync(SDL_Display, False);
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188 SDL_Unlock_EventThread();
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189 }
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190 }
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191
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192 /* Sets the mouse acceleration from a string of the form:
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193 2/1/0
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194 The first number is the numerator, followed by the acceleration
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195 denumenator and threshold.
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196 */
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197 static void SetMouseAccel(_THIS, const char *accel_param)
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198 {
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199 int i;
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200 int accel_value[3];
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201 char *mouse_param, *mouse_param_buf, *pin;
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202
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203 mouse_param_buf = (char *)malloc(strlen(accel_param)+1);
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204 if ( ! mouse_param_buf ) {
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205 return;
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206 }
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207 strcpy(mouse_param_buf, accel_param);
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208 mouse_param = mouse_param_buf;
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209
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210 for ( i=0; (i < 3) && mouse_param; ++i ) {
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211 pin = strchr(mouse_param, '/');
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212 if ( pin ) {
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213 *pin = '\0';
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214 }
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215 accel_value[i] = atoi(mouse_param);
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216 if ( pin ) {
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217 mouse_param = pin+1;
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218 } else {
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219 mouse_param = NULL;
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220 }
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221 }
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222 if ( mouse_param_buf ) {
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223 XChangePointerControl(SDL_Display, True, True,
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224 accel_value[0], accel_value[1], accel_value[2]);
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225 free(mouse_param_buf);
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226 }
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227 }
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228
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229 /* Check to see if we need to enter or leave mouse relative mode */
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230 void X11_CheckMouseModeNoLock(_THIS)
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231 {
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232 /* If the mouse is hidden and input is grabbed, we use relative mode */
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233 if ( !(SDL_cursorstate & CURSOR_VISIBLE) &&
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234 (this->input_grab != SDL_GRAB_OFF) &&
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235 (SDL_GetAppState() & SDL_APPACTIVE) ) {
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236 if ( ! mouse_relative ) {
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237 X11_EnableDGAMouse(this);
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238 if ( ! (using_dga & DGA_MOUSE) ) {
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239 char *xmouse_accel;
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240
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241 SDL_GetMouseState(&mouse_last.x, &mouse_last.y);
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242 /* Use as raw mouse mickeys as possible */
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243 XGetPointerControl(SDL_Display,
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244 &mouse_accel.numerator,
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245 &mouse_accel.denominator,
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246 &mouse_accel.threshold);
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247 xmouse_accel=getenv("SDL_VIDEO_X11_MOUSEACCEL");
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248 if ( xmouse_accel ) {
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249 SetMouseAccel(this, xmouse_accel);
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250 }
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251 }
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252 mouse_relative = 1;
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253 }
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254 } else {
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255 if ( mouse_relative ) {
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256 if ( using_dga & DGA_MOUSE ) {
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257 X11_DisableDGAMouse(this);
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258 } else {
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259 XChangePointerControl(SDL_Display, True, True,
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260 mouse_accel.numerator,
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261 mouse_accel.denominator,
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262 mouse_accel.threshold);
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263 }
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264 mouse_relative = 0;
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265 }
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266 }
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267 }
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268 void X11_CheckMouseMode(_THIS)
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269 {
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270 SDL_Lock_EventThread();
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271 X11_CheckMouseModeNoLock(this);
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272 SDL_Unlock_EventThread();
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273 }
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