SDL_x11shape.c
1
2
/*
Simple DirectMedia Layer
3
Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../../SDL_internal.h"
#if SDL_VIDEO_DRIVER_X11
#include "SDL_assert.h"
#include "SDL_x11video.h"
#include "SDL_x11shape.h"
#include "SDL_x11window.h"
#include "../SDL_shape_internals.h"
SDL_WindowShaper*
X11_CreateShaper(SDL_Window* window) {
SDL_WindowShaper* result = NULL;
SDL_ShapeData* data = NULL;
int resized_properly;
#if SDL_VIDEO_DRIVER_X11_XSHAPE
if (SDL_X11_HAVE_XSHAPE) { /* Make sure X server supports it. */
result = malloc(sizeof(SDL_WindowShaper));
result->window = window;
result->mode.mode = ShapeModeDefault;
result->mode.parameters.binarizationCutoff = 1;
result->userx = result->usery = 0;
data = SDL_malloc(sizeof(SDL_ShapeData));
result->driverdata = data;
data->bitmapsize = 0;
data->bitmap = NULL;
window->shaper = result;
resized_properly = X11_ResizeWindowShape(window);
SDL_assert(resized_properly == 0);
}
#endif
return result;
}
int
X11_ResizeWindowShape(SDL_Window* window) {
SDL_ShapeData* data = window->shaper->driverdata;
unsigned int bitmapsize = window->w / 8;
SDL_assert(data != NULL);
if(window->w % 8 > 0)
bitmapsize += 1;
bitmapsize *= window->h;
if(data->bitmapsize != bitmapsize || data->bitmap == NULL) {
data->bitmapsize = bitmapsize;
if(data->bitmap != NULL)
free(data->bitmap);
data->bitmap = malloc(data->bitmapsize);
if(data->bitmap == NULL) {
return SDL_SetError("Could not allocate memory for shaped-window bitmap.");
}
}
memset(data->bitmap,0,data->bitmapsize);
window->shaper->userx = window->x;
window->shaper->usery = window->y;
SDL_SetWindowPosition(window,-1000,-1000);
return 0;
}
int
X11_SetWindowShape(SDL_WindowShaper *shaper,SDL_Surface *shape,SDL_WindowShapeMode *shape_mode) {
SDL_ShapeData *data = NULL;
SDL_WindowData *windowdata = NULL;
Pixmap shapemask;
if(shaper == NULL || shape == NULL || shaper->driverdata == NULL)
return -1;
#if SDL_VIDEO_DRIVER_X11_XSHAPE
if(shape->format->Amask == 0 && SDL_SHAPEMODEALPHA(shape_mode->mode))
return -2;
if(shape->w != shaper->window->w || shape->h != shaper->window->h)
return -3;
data = shaper->driverdata;
/* Assume that shaper->alphacutoff already has a value, because SDL_SetWindowShape() should have given it one. */
SDL_CalculateShapeBitmap(shaper->mode,shape,data->bitmap,8);
windowdata = (SDL_WindowData*)(shaper->window->driverdata);
shapemask = X11_XCreateBitmapFromData(windowdata->videodata->display,windowdata->xwindow,data->bitmap,shaper->window->w,shaper->window->h);
X11_XShapeCombineMask(windowdata->videodata->display,windowdata->xwindow, ShapeBounding, 0, 0,shapemask, ShapeSet);
X11_XSync(windowdata->videodata->display,False);
X11_XFreePixmap(windowdata->videodata->display,shapemask);
#endif
return 0;
}
#endif /* SDL_VIDEO_DRIVER_X11 */