1 /*
2 Simple DirectMedia Layer
3 Copyright (C) 1997-2016 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_Window*
X11_CreateShapedWindow(const char * title,unsigned int x,unsigned int y,unsigned int w,unsigned int h,Uint32 flags)32 X11_CreateShapedWindow(const char *title,unsigned int x,unsigned int y,unsigned int w,unsigned int h,Uint32 flags) {
33 return SDL_CreateWindow(title,x,y,w,h,flags);
34 }
35
36 SDL_WindowShaper*
X11_CreateShaper(SDL_Window * window)37 X11_CreateShaper(SDL_Window* window) {
38 SDL_WindowShaper* result = NULL;
39 SDL_ShapeData* data = NULL;
40 int resized_properly;
41
42 #if SDL_VIDEO_DRIVER_X11_XSHAPE
43 if (SDL_X11_HAVE_XSHAPE) { /* Make sure X server supports it. */
44 result = malloc(sizeof(SDL_WindowShaper));
45 result->window = window;
46 result->mode.mode = ShapeModeDefault;
47 result->mode.parameters.binarizationCutoff = 1;
48 result->userx = result->usery = 0;
49 data = SDL_malloc(sizeof(SDL_ShapeData));
50 result->driverdata = data;
51 data->bitmapsize = 0;
52 data->bitmap = NULL;
53 window->shaper = result;
54 resized_properly = X11_ResizeWindowShape(window);
55 SDL_assert(resized_properly == 0);
56 }
57 #endif
58
59 return result;
60 }
61
62 int
X11_ResizeWindowShape(SDL_Window * window)63 X11_ResizeWindowShape(SDL_Window* window) {
64 SDL_ShapeData* data = window->shaper->driverdata;
65 unsigned int bitmapsize = window->w / 8;
66 SDL_assert(data != NULL);
67
68 if(window->w % 8 > 0)
69 bitmapsize += 1;
70 bitmapsize *= window->h;
71 if(data->bitmapsize != bitmapsize || data->bitmap == NULL) {
72 data->bitmapsize = bitmapsize;
73 if(data->bitmap != NULL)
74 free(data->bitmap);
75 data->bitmap = malloc(data->bitmapsize);
76 if(data->bitmap == NULL) {
77 return SDL_SetError("Could not allocate memory for shaped-window bitmap.");
78 }
79 }
80 memset(data->bitmap,0,data->bitmapsize);
81
82 window->shaper->userx = window->x;
83 window->shaper->usery = window->y;
84 SDL_SetWindowPosition(window,-1000,-1000);
85
86 return 0;
87 }
88
89 int
X11_SetWindowShape(SDL_WindowShaper * shaper,SDL_Surface * shape,SDL_WindowShapeMode * shape_mode)90 X11_SetWindowShape(SDL_WindowShaper *shaper,SDL_Surface *shape,SDL_WindowShapeMode *shape_mode) {
91 SDL_ShapeData *data = NULL;
92 SDL_WindowData *windowdata = NULL;
93 Pixmap shapemask;
94
95 if(shaper == NULL || shape == NULL || shaper->driverdata == NULL)
96 return -1;
97
98 #if SDL_VIDEO_DRIVER_X11_XSHAPE
99 if(shape->format->Amask == 0 && SDL_SHAPEMODEALPHA(shape_mode->mode))
100 return -2;
101 if(shape->w != shaper->window->w || shape->h != shaper->window->h)
102 return -3;
103 data = shaper->driverdata;
104
105 /* Assume that shaper->alphacutoff already has a value, because SDL_SetWindowShape() should have given it one. */
106 SDL_CalculateShapeBitmap(shaper->mode,shape,data->bitmap,8);
107
108 windowdata = (SDL_WindowData*)(shaper->window->driverdata);
109 shapemask = X11_XCreateBitmapFromData(windowdata->videodata->display,windowdata->xwindow,data->bitmap,shaper->window->w,shaper->window->h);
110
111 X11_XShapeCombineMask(windowdata->videodata->display,windowdata->xwindow, ShapeBounding, 0, 0,shapemask, ShapeSet);
112 X11_XSync(windowdata->videodata->display,False);
113
114 X11_XFreePixmap(windowdata->videodata->display,shapemask);
115 #endif
116
117 return 0;
118 }
119
120 #endif /* SDL_VIDEO_DRIVER_X11 */
121
122