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SDL_win32shape.c
105 lines (85 loc) · 3.29 KB
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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 "SDL_assert.h"
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#include "SDL_win32shape.h"
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#include "SDL_win32video.h"
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SDL_WindowShaper* Win32_CreateShaper(SDL_Window * window) {
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int resized_properly;
SDL_WindowShaper* result = (SDL_WindowShaper *)SDL_malloc(sizeof(SDL_WindowShaper));
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result->window = window;
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result->mode.mode = ShapeModeDefault;
result->mode.parameters.binarizationCutoff = 1;
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result->usershownflag = 0;
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result->driverdata = (SDL_ShapeData*)SDL_malloc(sizeof(SDL_ShapeData));
((SDL_ShapeData*)result->driverdata)->mask_tree = NULL;
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//Put some driver-data here.
window->shaper = result;
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resized_properly = Win32_ResizeWindowShape(window);
if (resized_properly != 0)
return NULL;
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return result;
}
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void CombineRectRegions(SDL_ShapeTree* node, void* closure) {
HRGN* mask_region = (HRGN *)closure;
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int combined = -1;
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if(node->kind == OpaqueShape) {
HRGN temp_region = CreateRectRgn(node->data.shape.x,node->data.shape.y,node->data.shape.w,node->data.shape.h);
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SDL_assert(temp_region != NULL);
combined = CombineRgn(*mask_region,*mask_region,temp_region, RGN_OR);
SDL_assert(combined == SIMPLEREGION || combined == COMPLEXREGION);
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DeleteObject(temp_region);
}
}
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int Win32_SetWindowShape(SDL_WindowShaper *shaper,SDL_Surface *shape,SDL_WindowShapeMode *shapeMode) {
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SDL_ShapeData *data;
HRGN mask_region;
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SDL_WindowData *windowdata;
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HWND hwnd;
if (shaper == NULL || shape == NULL)
return SDL_INVALID_SHAPE_ARGUMENT;
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if(shape->format->Amask == 0 && shapeMode->mode != ShapeModeColorKey || shape->w != shaper->window->w || shape->h != shaper->window->h)
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return SDL_INVALID_SHAPE_ARGUMENT;
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data = (SDL_ShapeData*)shaper->driverdata;
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if(data->mask_tree != NULL)
SDL_FreeShapeTree(&data->mask_tree);
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data->mask_tree = SDL_CalculateShapeTree(*shapeMode,shape);
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/*
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* Start with empty region
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*/
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mask_region = CreateRectRgn(0, 0, 0, 0);
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SDL_TraverseShapeTree(data->mask_tree,&CombineRectRegions,&mask_region);
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/*
* Set the new region mask for the window
*/
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windowdata=(SDL_WindowData *)(shaper->window->driverdata);
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hwnd = windowdata->hwnd;
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SDL_assert(SetWindowRgn(hwnd, mask_region, TRUE) != 0);
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return 0;
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}
int Win32_ResizeWindowShape(SDL_Window *window) {
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SDL_ShapeData* data;
if (window == NULL)
return -1;
data = (SDL_ShapeData *)window->shaper->driverdata;
if (data == NULL)
return -1;
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if(data->mask_tree != NULL)
SDL_FreeShapeTree(&data->mask_tree);
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window->shaper->usershownflag |= window->flags & SDL_WINDOW_SHOWN;
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return 0;
}