This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
SDL_x11shape.c
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/*
Simple DirectMedia Layer
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Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
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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_config.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_Window*
X11_CreateShapedWindow(const char *title,unsigned int x,unsigned int y,unsigned int w,unsigned int h,Uint32 flags) {
return SDL_CreateWindow(title,x,y,w,h,flags);
}
SDL_WindowShaper*
X11_CreateShaper(SDL_Window* window) {
SDL_WindowShaper* result = NULL;
#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;
SDL_ShapeData* data = SDL_malloc(sizeof(SDL_ShapeData));
result->driverdata = data;
data->bitmapsize = 0;
data->bitmap = NULL;
window->shaper = result;
int 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;
SDL_assert(data != NULL);
unsigned int bitmapsize = window->w / 8;
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) {
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return SDL_SetError("Could not allocate memory for shaped-window bitmap.");
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}
}
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) {
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;
SDL_ShapeData *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);
SDL_WindowData *windowdata = (SDL_WindowData*)(shaper->window->driverdata);
Pixmap shapemask = XCreateBitmapFromData(windowdata->videodata->display,windowdata->xwindow,data->bitmap,shaper->window->w,shaper->window->h);
XShapeCombineMask(windowdata->videodata->display,windowdata->xwindow, ShapeBounding, 0, 0,shapemask, ShapeSet);
XSync(windowdata->videodata->display,False);
XFreePixmap(windowdata->videodata->display,shapemask);
#endif
return 0;
}
#endif /* SDL_VIDEO_DRIVER_X11 */