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SDL_win32shape.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 <windows.h>
#include "SDL_win32shape.h"
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SDL_WindowShaper* Win32_CreateShaper(SDL_Window * window) {
SDL_WindowShaper* result = malloc(sizeof(SDL_WindowShaper));
result->window = window;
result->alphacutoff = 0;
result->usershownflag = 0;
//Put some driver-data here.
window->shaper = result;
int resized_properly = X11ResizeWindowShape(window);
assert(resized_properly == 0);
return result;
}
int Win32_SetWindowShape(SDL_WindowShaper *shaper,SDL_Surface *shape,SDL_WindowShapeMode *shapeMode) {
assert(shaper != NULL && shape != NULL);
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;
/* Assume that shaper->alphacutoff already has a value, because SDL_SetWindowShape() should have given it one. */
/*
* Start with empty region
*/
HRGN MaskRegion = CreateRectRgn(0, 0, 0, 0);
unsigned int pitch = shape->pitch;
unsigned int width = shape->width;
unsigned int height = shape->height;
unsigned int dy = pitch - width;
SDL_ShapeData *data = (SDL_ShapeData*)shaper->driverdata;
/*
* Transfer binarized mask image into workbuffer
*/
SDL_CalculateShapeBitmap(shaper->alphacutoff,shape,data->shapebuffer,1,0xff);
//Move code over to here from AW_windowShape.c
}
int Win32_ResizeWindowShape(SDL_Window *window) {
SDL_ShapeData* data = window->shaper->driverdata;
assert(data != NULL);
unsigned int buffersize = window->w * window->h;
if(data->buffersize != buffersize || data->shapebuffer == NULL) {
data->buffersize = buffersize;
if(data->shapebuffer != NULL)
free(data->shapebuffer);
data->shapebuffer = malloc(data->buffersize);
if(data->shapebuffer == NULL) {
SDL_SetError("Could not allocate memory for shaped-window bitmap.");
return -1;
}
}
window->shaper->usershownflag = window->flags & SDL_WINDOW_SHOWN;
return 0;
}