src/video/windows/SDL_windowsshape.c
author Sam Lantinga <slouken@libsdl.org>
Fri, 18 May 2018 13:09:30 -0700
changeset 11983 3a50eb90e4b2
parent 11811 5d94cb6b24d3
child 12503 806492103856
permissions -rw-r--r--
Merged latest changes from Steam Link app
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2018 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_internal.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 
    29 SDL_WindowShaper*
    30 Win32_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 
    48 static void
    49 CombineRectRegions(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 
    63 int
    64 Win32_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) ||
    69         (shape == NULL) ||
    70         ((shape->format->Amask == 0) && (shape_mode->mode != ShapeModeColorKey)) ||
    71         (shape->w != shaper->window->w) ||
    72         (shape->h != shaper->window->h) ) {
    73         return SDL_INVALID_SHAPE_ARGUMENT;
    74     }
    75 
    76     data = (SDL_ShapeData*)shaper->driverdata;
    77     if(data->mask_tree != NULL)
    78         SDL_FreeShapeTree(&data->mask_tree);
    79     data->mask_tree = SDL_CalculateShapeTree(*shape_mode,shape);
    80 
    81     SDL_TraverseShapeTree(data->mask_tree,&CombineRectRegions,&mask_region);
    82     SDL_assert(mask_region != NULL);
    83 
    84     SetWindowRgn(((SDL_WindowData *)(shaper->window->driverdata))->hwnd, mask_region, TRUE);
    85 
    86     return 0;
    87 }
    88 
    89 int
    90 Win32_ResizeWindowShape(SDL_Window *window) {
    91     SDL_ShapeData* data;
    92 
    93     if (window == NULL)
    94         return -1;
    95     data = (SDL_ShapeData *)window->shaper->driverdata;
    96     if (data == NULL)
    97         return -1;
    98 
    99     if(data->mask_tree != NULL)
   100         SDL_FreeShapeTree(&data->mask_tree);
   101     if(window->shaper->hasshape == SDL_TRUE) {
   102         window->shaper->userx = window->x;
   103         window->shaper->usery = window->y;
   104         SDL_SetWindowPosition(window,-1000,-1000);
   105     }
   106 
   107     return 0;
   108 }
   109 
   110 #endif /* SDL_VIDEO_DRIVER_WINDOWS */