cscg22-gearboy

CSCG 2022 Challenge 'Gearboy'
git clone https://git.sinitax.com/sinitax/cscg22-gearboy
Log | Files | Refs | sfeed.txt

SDL_windowsshape.c (3830B)

      1/*
      2  Simple DirectMedia Layer
      3  Copyright (C) 1997-2014 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
     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) ||
     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
     89int
     90Win32_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 */