/project/jni/sdl-1.3/src/video/windows/SDL_windowsshape.c

  1/*
  2  Simple DirectMedia Layer
  3  Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>
  4
  5  This software is provided 'as-is', without any express or implied
  6  warranty.  In no event will the authors be held liable for any damages
  7  arising from the use of this software.
  8
  9  Permission is granted to anyone to use this software for any purpose,
 10  including commercial applications, and to alter it and redistribute it
 11  freely, subject to the following restrictions:
 12
 13  1. The origin of this software must not be misrepresented; you must not
 14     claim that you wrote the original software. If you use this software
 15     in a product, an acknowledgment in the product documentation would be
 16     appreciated but is not required.
 17  2. Altered source versions must be plainly marked as such, and must not be
 18     misrepresented as being the original software.
 19  3. This notice may not be removed or altered from any source distribution.
 20*/
 21#include "SDL_config.h"
 22
 23#if SDL_VIDEO_DRIVER_WINDOWS
 24
 25#include "SDL_assert.h"
 26#include "SDL_windowsshape.h"
 27#include "SDL_windowsvideo.h"
 28
 29SDL_WindowShaper*
 30Win32_CreateShaper(SDL_Window * window) {
 31    int resized_properly;
 32    SDL_WindowShaper* result = (SDL_WindowShaper *)SDL_malloc(sizeof(SDL_WindowShaper));
 33    result->window = window;
 34    result->mode.mode = ShapeModeDefault;
 35    result->mode.parameters.binarizationCutoff = 1;
 36    result->userx = result->usery = 0;
 37    result->driverdata = (SDL_ShapeData*)SDL_malloc(sizeof(SDL_ShapeData));
 38    ((SDL_ShapeData*)result->driverdata)->mask_tree = NULL;
 39    //Put some driver-data here.
 40    window->shaper = result;
 41    resized_properly = Win32_ResizeWindowShape(window);
 42    if (resized_properly != 0)
 43            return NULL;
 44    
 45    return result;
 46}
 47
 48void
 49CombineRectRegions(SDL_ShapeTree* node,void* closure) {
 50    HRGN mask_region = *((HRGN*)closure),temp_region = NULL;
 51    if(node->kind == OpaqueShape) {
 52        //Win32 API regions exclude their outline, so we widen the region by one pixel in each direction to include the real outline.
 53        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);
 54        if(mask_region != NULL) {
 55            CombineRgn(mask_region,mask_region,temp_region,RGN_OR);
 56            DeleteObject(temp_region);
 57		}
 58		else
 59            *((HRGN*)closure) = temp_region;
 60	}
 61}
 62
 63int
 64Win32_SetWindowShape(SDL_WindowShaper *shaper,SDL_Surface *shape,SDL_WindowShapeMode *shape_mode) {
 65    SDL_ShapeData *data;
 66    HRGN mask_region = NULL;
 67
 68    if (shaper == NULL || shape == NULL)
 69        return SDL_INVALID_SHAPE_ARGUMENT;
 70    if(shape->format->Amask == 0 && shape_mode->mode != ShapeModeColorKey || shape->w != shaper->window->w || shape->h != shaper->window->h)
 71        return SDL_INVALID_SHAPE_ARGUMENT;
 72    
 73    data = (SDL_ShapeData*)shaper->driverdata;
 74    if(data->mask_tree != NULL)
 75        SDL_FreeShapeTree(&data->mask_tree);
 76    data->mask_tree = SDL_CalculateShapeTree(*shape_mode,shape);
 77    
 78    SDL_TraverseShapeTree(data->mask_tree,&CombineRectRegions,&mask_region);
 79	SDL_assert(mask_region != NULL);
 80
 81    SetWindowRgn(((SDL_WindowData *)(shaper->window->driverdata))->hwnd, mask_region, TRUE);
 82    
 83    return 0;
 84}
 85
 86int
 87Win32_ResizeWindowShape(SDL_Window *window) {
 88    SDL_ShapeData* data;
 89
 90    if (window == NULL)
 91        return -1;
 92    data = (SDL_ShapeData *)window->shaper->driverdata;
 93    if (data == NULL)
 94        return -1;
 95    
 96    if(data->mask_tree != NULL)
 97        SDL_FreeShapeTree(&data->mask_tree);
 98    if(window->shaper->hasshape == SDL_TRUE) {
 99        window->shaper->userx = window->x;
100        window->shaper->usery = window->y;
101        SDL_SetWindowPosition(window,-1000,-1000);
102	}
103    
104    return 0;
105}
106
107#endif /* SDL_VIDEO_DRIVER_WINDOWS */