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annotate src/video/x11/SDL_x11shape.c @ 4802:f14a8c05f5bb

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Minor bugfixes. testshape now draws a shaped window with bizarre, pixellated gashes of transparency across it, and in doing so seems to hog a system resource and slow the rest of the video system down.
author Eli Gottlieb <eligottlieb@gmail.com>
date Sun, 18 Jul 2010 23:05:40 -0400
parents 6f0bc179771c
children c9eb95f29770
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
6e03d73054d7 Fixed names of driver-specific implementation files.
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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 <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_WindowShaper* X11_CreateShaper(SDL_Window* window) {
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29 SDL_WindowShaper* result = NULL;
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30
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31 #if SDL_VIDEO_DRIVER_X11_XSHAPE
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32 if (SDL_X11_HAVE_XSHAPE) { /* Make sure X server supports it. */
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33 result = malloc(sizeof(SDL_WindowShaper));
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34 result->window = window;
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35 result->alphacutoff = 0;
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36 result->usershownflag = 0;
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37 SDL_ShapeData* data = malloc(sizeof(SDL_ShapeData));
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38 result->driverdata = data;
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39 data->bitmapsize = 0;
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40 data->bitmap = NULL;
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41 window->shaper = result;
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42 int resized_properly = X11_ResizeWindowShape(window);
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43 assert(resized_properly == 0);
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44 }
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45 #endif
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46
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47 return result;
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48 }
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49
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50 int X11_ResizeWindowShape(SDL_Window* window) {
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51 SDL_ShapeData* data = window->shaper->driverdata;
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52 assert(data != NULL);
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53
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54 unsigned int bitmapsize = window->w / 8;
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55 if(window->w % 8 > 0)
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56 bitmapsize += 1;
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57 bitmapsize *= window->h;
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58 if(data->bitmapsize != bitmapsize || data->bitmap == NULL) {
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59 data->bitmapsize = bitmapsize;
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60 if(data->bitmap != NULL)
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61 free(data->bitmap);
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62 data->bitmap = malloc(data->bitmapsize);
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63 if(data->bitmap == NULL) {
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64 SDL_SetError("Could not allocate memory for shaped-window bitmap.");
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65 return -1;
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66 }
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67 }
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68
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f14a8c05f5bb Minor bugfixes. testshape now draws a shaped window with bizarre, pixellated gashes of transparency across it, and in doing so seems to hog a system resource and slow the rest of the video system down.
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69 window->shaper->usershownflag |= window->flags & SDL_WINDOW_SHOWN;
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70
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71 return 0;
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72 }
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73
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74 int X11_SetWindowShape(SDL_WindowShaper *shaper,SDL_Surface *shape,SDL_WindowShapeMode *shapeMode) {
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75 if(shaper == NULL || shape == NULL || shaper->driverdata == NULL)
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76 return -1;
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77
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78 #if SDL_VIDEO_DRIVER_X11_XSHAPE
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79 if(!SDL_ISPIXELFORMAT_ALPHA(SDL_MasksToPixelFormatEnum(shape->format->BitsPerPixel,shape->format->Rmask,shape->format->Gmask,shape->format->Bmask,shape->format->Amask)))
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80 return -2;
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81 if(shape->w != shaper->window->w || shape->h != shaper->window->h)
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82 return -3;
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83 SDL_ShapeData *data = shaper->driverdata;
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84
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85 /* Assume that shaper->alphacutoff already has a value, because SDL_SetWindowShape() should have given it one. */
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86 SDL_CalculateShapeBitmap(shaper->alphacutoff,shape,data->bitmap,8,1);
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87
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88 SDL_WindowData *windowdata = (SDL_WindowData*)(shaper->window->driverdata);
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89 Pixmap shapemask = XCreateBitmapFromData(windowdata->videodata->display,windowdata->xwindow,data->bitmap,shaper->window->w,shaper->window->h);
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90
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91 XShapeCombineMask(windowdata->videodata->display,windowdata->xwindow, ShapeBounding, 0, 0,shapemask, ShapeSet);
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92 XSync(windowdata->videodata->display,False);
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93
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94 XFreePixmap(windowdata->videodata->display,shapemask);
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95 #endif
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96
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97 return 0;
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98 }