1 /*
2   Simple DirectMedia Layer
3   Copyright (C) 1997-2020 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*
X11_CreateShaper(SDL_Window * window)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
X11_ResizeWindowShape(SDL_Window * window)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
X11_SetWindowShape(SDL_WindowShaper * shaper,SDL_Surface * shape,SDL_WindowShapeMode * shape_mode)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 */
116