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SDL_x11shape.c
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 2010 Eli Gottlieb
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Eli Gottlieb
eligottlieb@gmail.com
*/
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#include <assert.h>
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#include <X11/extensions/shape.h>
#include "SDL_x11shape.h"
#include "SDL_x11window.h"
#include "SDL_x11video.h"
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SDL_WindowShaper* X11_CreateShaper(SDL_Window* window) {
SDL_WindowShaper* result = malloc(sizeof(SDL_WindowShaper));
result->window = window;
result->alphacutoff = 0;
result->usershownflag = 0;
result->driverdata = malloc(sizeof(SDL_ShapeData));
window->shaper = result;
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int resized_properly = X11_ResizeWindowShape(window);
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assert(resized_properly == 0);
return result;
}
int X11_ResizeWindowShape(SDL_Window* window) {
SDL_ShapeData* data = window->shaper->driverdata;
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) {
SDL_SetError("Could not allocate memory for shaped-window bitmap.");
return -1;
}
}
window->shaper->usershownflag = window->flags & SDL_WINDOW_SHOWN;
return 0;
}
int X11_SetWindowShape(SDL_WindowShaper *shaper,SDL_Surface *shape,SDL_WindowShapeMode *shapeMode) {
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if(shaper == NULL || shape == NULL || shaper->driverdata == NULL)
return -1;
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if(!SDL_ISPIXELFORMAT_ALPHA(SDL_MasksToPixelFormatEnum(shape->format->BitsPerPixel,shape->format->Rmask,shape->format->Gmask,shape->format->Bmask,shape->format->Amask)))
return -2;
if(shape->w != shaper->window->w || shape->h != shaper->window->h)
return -3;
SDL_ShapeData *data = shaper->driverdata;
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/* Assume that shaper->alphacutoff already has a value, because SDL_SetWindowShape() should have given it one. */
SDL_CalculateShapeBitmap(shaper->alphacutoff,shape,data->bitmap,8,1);
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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);
return 0;
}