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SDL_windowsshape.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 <stdio.h>
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#include "SDL_assert.h"
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#include "SDL_windowsshape.h"
#include "SDL_windowsvideo.h"
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SDL_WindowShaper*
Win32_CreateShaper(SDL_Window * window) {
int resized_properly;
SDL_WindowShaper* result = (SDL_WindowShaper *)SDL_malloc(sizeof(SDL_WindowShaper));
result->window = window;
result->mode.mode = ShapeModeDefault;
result->mode.parameters.binarizationCutoff = 1;
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result->userx = result->usery = 0;
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result->driverdata = (SDL_ShapeData*)SDL_malloc(sizeof(SDL_ShapeData));
((SDL_ShapeData*)result->driverdata)->mask_tree = NULL;
//Put some driver-data here.
window->shaper = result;
resized_properly = Win32_ResizeWindowShape(window);
if (resized_properly != 0)
return NULL;
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CombineRectRegions(SDL_ShapeTree* node,void* closure) {
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HRGN mask_region = *((HRGN*)closure),temp_region = NULL;
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if(node->kind == OpaqueShape) {
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//Win32 API regions exclude their outline, so we widen the region by one pixel in each direction to include the real outline.
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temp_region = CreateRectRgn(node->data.shape.x,node->data.shape.y,node->data.shape.x + node->data.shape.w + 1,node->data.shape.y + node->data.shape.h + 1);
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if(mask_region != NULL) {
CombineRgn(mask_region,mask_region,temp_region,RGN_OR);
DeleteObject(temp_region);
}
else
*((HRGN*)closure) = temp_region;
}
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Win32_SetWindowShape(SDL_WindowShaper *shaper,SDL_Surface *shape,SDL_WindowShapeMode *shape_mode) {
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SDL_ShapeData *data;
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HRGN mask_region = NULL;
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if (shaper == NULL || shape == NULL)
return SDL_INVALID_SHAPE_ARGUMENT;
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if(shape->format->Amask == 0 && shape_mode->mode != ShapeModeColorKey || shape->w != shaper->window->w || shape->h != shaper->window->h)
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return SDL_INVALID_SHAPE_ARGUMENT;
data = (SDL_ShapeData*)shaper->driverdata;
if(data->mask_tree != NULL)
SDL_FreeShapeTree(&data->mask_tree);
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data->mask_tree = SDL_CalculateShapeTree(*shape_mode,shape);
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SDL_TraverseShapeTree(data->mask_tree,&CombineRectRegions,&mask_region);
SDL_assert(mask_region != NULL);
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SetWindowRgn(((SDL_WindowData *)(shaper->window->driverdata))->hwnd, mask_region, TRUE);
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int
Win32_ResizeWindowShape(SDL_Window *window) {
SDL_ShapeData* data;
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if (window == NULL)
return -1;
data = (SDL_ShapeData *)window->shaper->driverdata;
if (data == NULL)
return -1;
if(data->mask_tree != NULL)
SDL_FreeShapeTree(&data->mask_tree);
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if(window->shaper->hasshape == SDL_TRUE) {
window->shaper->userx = window->x;
window->shaper->usery = window->y;
SDL_SetWindowPosition(window,-1000,-1000);
}