SDL  2.0
SDL_x11shape.c
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1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
4 
5  This software is provided 'as-is', without any express or implied
6  warranty. In no event will the authors be held liable for any damages
7  arising from the use of this software.
8 
9  Permission is granted to anyone to use this software for any purpose,
10  including commercial applications, and to alter it and redistribute it
11  freely, subject to the following restrictions:
12 
13  1. The origin of this software must not be misrepresented; you must not
14  claim that you wrote the original software. If you use this software
15  in a product, an acknowledgment in the product documentation would be
16  appreciated but is not required.
17  2. Altered source versions must be plainly marked as such, and must not be
18  misrepresented as being the original software.
19  3. This notice may not be removed or altered from any source distribution.
20 */
21 #include "../../SDL_internal.h"
22 
23 #if SDL_VIDEO_DRIVER_X11
24 
25 #include "SDL_assert.h"
26 #include "SDL_x11video.h"
27 #include "SDL_x11shape.h"
28 #include "SDL_x11window.h"
29 #include "../SDL_shape_internals.h"
30 
31 SDL_WindowShaper*
32 X11_CreateShaper(SDL_Window* window) {
33  SDL_WindowShaper* result = NULL;
34  SDL_ShapeData* data = NULL;
35  int resized_properly;
36 
37 #if SDL_VIDEO_DRIVER_X11_XSHAPE
38  if (SDL_X11_HAVE_XSHAPE) { /* Make sure X server supports it. */
39  result = malloc(sizeof(SDL_WindowShaper));
40  result->window = window;
41  result->mode.mode = ShapeModeDefault;
42  result->mode.parameters.binarizationCutoff = 1;
43  result->userx = result->usery = 0;
44  data = SDL_malloc(sizeof(SDL_ShapeData));
45  result->driverdata = data;
46  data->bitmapsize = 0;
47  data->bitmap = NULL;
48  window->shaper = result;
49  resized_properly = X11_ResizeWindowShape(window);
50  SDL_assert(resized_properly == 0);
51  }
52 #endif
53 
54  return result;
55 }
56 
57 int
58 X11_ResizeWindowShape(SDL_Window* window) {
59  SDL_ShapeData* data = window->shaper->driverdata;
60  unsigned int bitmapsize = window->w / 8;
61  SDL_assert(data != NULL);
62 
63  if(window->w % 8 > 0)
64  bitmapsize += 1;
65  bitmapsize *= window->h;
66  if(data->bitmapsize != bitmapsize || data->bitmap == NULL) {
67  data->bitmapsize = bitmapsize;
68  if(data->bitmap != NULL)
69  free(data->bitmap);
70  data->bitmap = malloc(data->bitmapsize);
71  if(data->bitmap == NULL) {
72  return SDL_SetError("Could not allocate memory for shaped-window bitmap.");
73  }
74  }
75  memset(data->bitmap,0,data->bitmapsize);
76 
77  window->shaper->userx = window->x;
78  window->shaper->usery = window->y;
79  SDL_SetWindowPosition(window,-1000,-1000);
80 
81  return 0;
82 }
83 
84 int
85 X11_SetWindowShape(SDL_WindowShaper *shaper,SDL_Surface *shape,SDL_WindowShapeMode *shape_mode) {
86  SDL_ShapeData *data = NULL;
87  SDL_WindowData *windowdata = NULL;
88  Pixmap shapemask;
89 
90  if(shaper == NULL || shape == NULL || shaper->driverdata == NULL)
91  return -1;
92 
93 #if SDL_VIDEO_DRIVER_X11_XSHAPE
94  if(shape->format->Amask == 0 && SDL_SHAPEMODEALPHA(shape_mode->mode))
95  return -2;
96  if(shape->w != shaper->window->w || shape->h != shaper->window->h)
97  return -3;
98  data = shaper->driverdata;
99 
100  /* Assume that shaper->alphacutoff already has a value, because SDL_SetWindowShape() should have given it one. */
101  SDL_CalculateShapeBitmap(shaper->mode,shape,data->bitmap,8);
102 
103  windowdata = (SDL_WindowData*)(shaper->window->driverdata);
104  shapemask = X11_XCreateBitmapFromData(windowdata->videodata->display,windowdata->xwindow,data->bitmap,shaper->window->w,shaper->window->h);
105 
106  X11_XShapeCombineMask(windowdata->videodata->display,windowdata->xwindow, ShapeBounding, 0, 0,shapemask, ShapeSet);
107  X11_XSync(windowdata->videodata->display,False);
108 
109  X11_XFreePixmap(windowdata->videodata->display,shapemask);
110 #endif
111 
112  return 0;
113 }
114 
115 #endif /* SDL_VIDEO_DRIVER_X11 */