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