| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org> |
| |
| This software is provided 'as-is', without any express or implied |
| warranty. In no event will the authors be held liable for any damages |
| arising from the use of this software. |
| |
| Permission is granted to anyone to use this software for any purpose, |
| including commercial applications, and to alter it and redistribute it |
| freely, subject to the following restrictions: |
| |
| 1. The origin of this software must not be misrepresented; you must not |
| claim that you wrote the original software. If you use this software |
| in a product, an acknowledgment in the product documentation would be |
| appreciated but is not required. |
| 2. Altered source versions must be plainly marked as such, and must not be |
| misrepresented as being the original software. |
| 3. This notice may not be removed or altered from any source distribution. |
| */ |
| #include "../../SDL_internal.h" |
| |
| #if SDL_VIDEO_DRIVER_WINDOWS |
| |
| #include "SDL_assert.h" |
| #include "SDL_windowsshape.h" |
| #include "SDL_windowsvideo.h" |
| |
| 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; |
| result->userx = result->usery = 0; |
| 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; |
| |
| return result; |
| } |
| |
| static void |
| CombineRectRegions(SDL_ShapeTree* node,void* closure) { |
| HRGN mask_region = *((HRGN*)closure),temp_region = NULL; |
| if(node->kind == OpaqueShape) { |
| /* Win32 API regions exclude their outline, so we widen the region by one pixel in each direction to include the real outline. */ |
| 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); |
| if(mask_region != NULL) { |
| CombineRgn(mask_region,mask_region,temp_region,RGN_OR); |
| DeleteObject(temp_region); |
| } |
| else |
| *((HRGN*)closure) = temp_region; |
| } |
| } |
| |
| int |
| Win32_SetWindowShape(SDL_WindowShaper *shaper,SDL_Surface *shape,SDL_WindowShapeMode *shape_mode) { |
| SDL_ShapeData *data; |
| HRGN mask_region = NULL; |
| |
| if( (shaper == NULL) || |
| (shape == NULL) || |
| ((shape->format->Amask == 0) && (shape_mode->mode != ShapeModeColorKey)) || |
| (shape->w != shaper->window->w) || |
| (shape->h != shaper->window->h) ) { |
| return SDL_INVALID_SHAPE_ARGUMENT; |
| } |
| |
| data = (SDL_ShapeData*)shaper->driverdata; |
| if(data->mask_tree != NULL) |
| SDL_FreeShapeTree(&data->mask_tree); |
| data->mask_tree = SDL_CalculateShapeTree(*shape_mode,shape); |
| |
| SDL_TraverseShapeTree(data->mask_tree,&CombineRectRegions,&mask_region); |
| SDL_assert(mask_region != NULL); |
| |
| SetWindowRgn(((SDL_WindowData *)(shaper->window->driverdata))->hwnd, mask_region, TRUE); |
| |
| return 0; |
| } |
| |
| int |
| Win32_ResizeWindowShape(SDL_Window *window) { |
| SDL_ShapeData* data; |
| |
| 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); |
| if(window->shaper->hasshape == SDL_TRUE) { |
| window->shaper->userx = window->x; |
| window->shaper->usery = window->y; |
| SDL_SetWindowPosition(window,-1000,-1000); |
| } |
| |
| return 0; |
| } |
| |
| #endif /* SDL_VIDEO_DRIVER_WINDOWS */ |