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annotate src/video/x11/SDL_x11shape.c @ 5206:25ffd4e5255c

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Minor consistency cleanup and documentation link update.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 06 Feb 2011 00:48:41 -0800
parents 5624fb0190b5
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) 2010 Eli Gottlieb
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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 Eli Gottlieb
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20 eligottlieb@gmail.com
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21 */
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22
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23 #include "SDL_assert.h"
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24 #include "SDL_x11video.h"
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25 #include "SDL_x11shape.h"
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26 #include "SDL_x11window.h"
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27
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28 SDL_Window*
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29 X11_CreateShapedWindow(const char *title,unsigned int x,unsigned int y,unsigned int w,unsigned int h,Uint32 flags) {
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30 return SDL_CreateWindow(title,x,y,w,h,flags);
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31 }
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32
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33 SDL_WindowShaper*
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34 X11_CreateShaper(SDL_Window* window) {
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35 SDL_WindowShaper* result = NULL;
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36
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37 #if SDL_VIDEO_DRIVER_X11_XSHAPE
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38 if (SDL_X11_HAVE_XSHAPE) { /* Make sure X server supports it. */
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39 result = malloc(sizeof(SDL_WindowShaper));
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40 result->window = window;
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41 result->mode.mode = ShapeModeDefault;
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42 result->mode.parameters.binarizationCutoff = 1;
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43 result->userx = result->usery = 0;
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44 SDL_ShapeData* data = SDL_malloc(sizeof(SDL_ShapeData));
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45 result->driverdata = data;
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46 data->bitmapsize = 0;
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47 data->bitmap = NULL;
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48 window->shaper = result;
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49 int resized_properly = X11_ResizeWindowShape(window);
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50 SDL_assert(resized_properly == 0);
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51 }
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52 #endif
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53
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54 return result;
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55 }
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56
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57 int
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58 X11_ResizeWindowShape(SDL_Window* window) {
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59 SDL_ShapeData* data = window->shaper->driverdata;
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60 SDL_assert(data != NULL);
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61
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62 unsigned int bitmapsize = window->w / 8;
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63 if(window->w % 8 > 0)
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64 bitmapsize += 1;
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65 bitmapsize *= window->h;
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66 if(data->bitmapsize != bitmapsize || data->bitmap == NULL) {
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67 data->bitmapsize = bitmapsize;
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68 if(data->bitmap != NULL)
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69 free(data->bitmap);
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70 data->bitmap = malloc(data->bitmapsize);
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71 if(data->bitmap == NULL) {
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72 SDL_SetError("Could not allocate memory for shaped-window bitmap.");
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73 return -1;
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74 }
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75 }
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76 memset(data->bitmap,0,data->bitmapsize);
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77
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78 window->shaper->userx = window->x;
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79 window->shaper->usery = window->y;
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80 SDL_SetWindowPosition(window,-1000,-1000);
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81
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82 return 0;
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83 }
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84
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85 int
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86 X11_SetWindowShape(SDL_WindowShaper *shaper,SDL_Surface *shape,SDL_WindowShapeMode *shape_mode) {
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87 if(shaper == NULL || shape == NULL || shaper->driverdata == NULL)
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88 return -1;
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89
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90 #if SDL_VIDEO_DRIVER_X11_XSHAPE
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91 if(shape->format->Amask == 0 && SDL_SHAPEMODEALPHA(shape_mode->mode))
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92 return -2;
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93 if(shape->w != shaper->window->w || shape->h != shaper->window->h)
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94 return -3;
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95 SDL_ShapeData *data = shaper->driverdata;
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97 /* Assume that shaper->alphacutoff already has a value, because SDL_SetWindowShape() should have given it one. */
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98 SDL_CalculateShapeBitmap(shaper->mode,shape,data->bitmap,8);
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99
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100 SDL_WindowData *windowdata = (SDL_WindowData*)(shaper->window->driverdata);
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101 Pixmap shapemask = XCreateBitmapFromData(windowdata->videodata->display,windowdata->xwindow,data->bitmap,shaper->window->w,shaper->window->h);
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102
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103 XShapeCombineMask(windowdata->videodata->display,windowdata->xwindow, ShapeBounding, 0, 0,shapemask, ShapeSet);
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104 XSync(windowdata->videodata->display,False);
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105
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106 XFreePixmap(windowdata->videodata->display,shapemask);
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107 #endif
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108
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109 return 0;
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110 }