SDL  2.0
SDL_windowsshape.c
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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 
31  int resized_properly;
33  result->window = window;
34  result->mode.mode = ShapeModeDefault;
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
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) ) {
74  }
75 
76  data = (SDL_ShapeData*)shaper->driverdata;
77  if(data->mask_tree != NULL)
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
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)
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 */
void SDL_FreeShapeTree(SDL_ShapeTree **shape_tree)
Definition: SDL_shape.c:246
SDL_ShapeTree * SDL_CalculateShapeTree(SDL_WindowShapeMode mode, SDL_Surface *shape)
Definition: SDL_shape.c:213
GLuint64EXT * result
int Win32_ResizeWindowShape(SDL_Window *window)
SDL_bool hasshape
Definition: SDL_sysvideo.h:52
A collection of pixels used in software blitting.
Definition: SDL_surface.h:69
A color key is applied.
Definition: SDL_shape.h:88
GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * data
Definition: SDL_opengl.h:1974
SDL_ShapeUnion data
SDL_WindowShaper * Win32_CreateShaper(SDL_Window *window)
#define SDL_INVALID_SHAPE_ARGUMENT
Definition: SDL_shape.h:43
SDL_WindowShapeMode mode
Definition: SDL_sysvideo.h:49
SDL_WindowShaper * shaper
Definition: SDL_sysvideo.h:104
SDL_Window * window
Definition: SDL_sysvideo.h:43
#define TRUE
Definition: edid-parse.c:33
SDL_ShapeTree * mask_tree
The default mode, a binarized alpha cutoff of 1.
Definition: SDL_shape.h:82
SDL_WindowShapeParams parameters
Window-shape parameters.
Definition: SDL_shape.h:105
int x
Definition: SDL_rect.h:66
int w
Definition: SDL_rect.h:67
#define SDL_assert(condition)
Definition: SDL_assert.h:169
#define NULL
Definition: begin_code.h:164
SDL_PixelFormat * format
Definition: SDL_surface.h:72
EGLSurface EGLNativeWindowType * window
Definition: eglext.h:1025
int Win32_SetWindowShape(SDL_WindowShaper *shaper, SDL_Surface *shape, SDL_WindowShapeMode *shape_mode)
int h
Definition: SDL_rect.h:67
The type used to identify a window.
Definition: SDL_sysvideo.h:73
void SDL_TraverseShapeTree(SDL_ShapeTree *tree, SDL_TraversalFunction function, void *closure)
Definition: SDL_shape.c:232
Uint8 binarizationCutoff
A cutoff alpha value for binarization of the window shape&#39;s alpha channel.
Definition: SDL_shape.h:96
#define SDL_malloc
A struct that tags the SDL_WindowShapeParams union with an enum describing the type of its contents...
Definition: SDL_shape.h:101
void * driverdata
Definition: SDL_sysvideo.h:111
SDL_ShapeKind kind
WindowShapeMode mode
The mode of these window-shape parameters.
Definition: SDL_shape.h:103
int y
Definition: SDL_rect.h:66
#define SDL_SetWindowPosition