SDL  2.0
SDL_shape.h
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1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2021 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 
22 #ifndef SDL_shape_h_
23 #define SDL_shape_h_
24 
25 #include "SDL_stdinc.h"
26 #include "SDL_pixels.h"
27 #include "SDL_rect.h"
28 #include "SDL_surface.h"
29 #include "SDL_video.h"
30 
31 #include "begin_code.h"
32 /* Set up for C function definitions, even when using C++ */
33 #ifdef __cplusplus
34 extern "C" {
35 #endif
36 
37 /** \file SDL_shape.h
38  *
39  * Header file for the shaped window API.
40  */
41 
42 #define SDL_NONSHAPEABLE_WINDOW -1
43 #define SDL_INVALID_SHAPE_ARGUMENT -2
44 #define SDL_WINDOW_LACKS_SHAPE -3
45 
46 /**
47  * Create a window that can be shaped with the specified position, dimensions,
48  * and flags.
49  *
50  * \param title The title of the window, in UTF-8 encoding.
51  * \param x The x position of the window, ::SDL_WINDOWPOS_CENTERED, or
52  * ::SDL_WINDOWPOS_UNDEFINED.
53  * \param y The y position of the window, ::SDL_WINDOWPOS_CENTERED, or
54  * ::SDL_WINDOWPOS_UNDEFINED.
55  * \param w The width of the window.
56  * \param h The height of the window.
57  * \param flags The flags for the window, a mask of SDL_WINDOW_BORDERLESS with
58  * any of the following: ::SDL_WINDOW_OPENGL,
59  * ::SDL_WINDOW_INPUT_GRABBED, ::SDL_WINDOW_HIDDEN,
60  * ::SDL_WINDOW_RESIZABLE, ::SDL_WINDOW_MAXIMIZED,
61  * ::SDL_WINDOW_MINIMIZED, ::SDL_WINDOW_BORDERLESS is always set,
62  * and ::SDL_WINDOW_FULLSCREEN is always unset.
63  * \return the window created, or NULL if window creation failed.
64  *
65  * \sa SDL_DestroyWindow
66  */
67 extern DECLSPEC SDL_Window * SDLCALL SDL_CreateShapedWindow(const char *title,unsigned int x,unsigned int y,unsigned int w,unsigned int h,Uint32 flags);
68 
69 /**
70  * Return whether the given window is a shaped window.
71  *
72  * \param window The window to query for being shaped.
73  * \return SDL_TRUE if the window is a window that can be shaped, SDL_FALSE if
74  * the window is unshaped or NULL.
75  *
76  * \sa SDL_CreateShapedWindow
77  */
78 extern DECLSPEC SDL_bool SDLCALL SDL_IsShapedWindow(const SDL_Window *window);
79 
80 /** \brief An enum denoting the specific type of contents present in an SDL_WindowShapeParams union. */
81 typedef enum {
82  /** \brief The default mode, a binarized alpha cutoff of 1. */
84  /** \brief A binarized alpha cutoff with a given integer value. */
86  /** \brief A binarized alpha cutoff with a given integer value, but with the opposite comparison. */
88  /** \brief A color key is applied. */
91 
92 #define SDL_SHAPEMODEALPHA(mode) (mode == ShapeModeDefault || mode == ShapeModeBinarizeAlpha || mode == ShapeModeReverseBinarizeAlpha)
93 
94 /** \brief A union containing parameters for shaped windows. */
95 typedef union {
96  /** \brief A cutoff alpha value for binarization of the window shape's alpha channel. */
100 
101 /** \brief A struct that tags the SDL_WindowShapeParams union with an enum describing the type of its contents. */
102 typedef struct SDL_WindowShapeMode {
103  /** \brief The mode of these window-shape parameters. */
104  WindowShapeMode mode;
105  /** \brief Window-shape parameters. */
108 
109 /**
110  * Set the shape and parameters of a shaped window.
111  *
112  * \param window The shaped window whose parameters should be set.
113  * \param shape A surface encoding the desired shape for the window.
114  * \param shape_mode The parameters to set for the shaped window.
115  * \return 0 on success, SDL_INVALID_SHAPE_ARGUMENT on an invalid shape
116  * argument, or SDL_NONSHAPEABLE_WINDOW if the SDL_Window given does
117  * not reference a valid shaped window.
118  *
119  * \sa SDL_WindowShapeMode
120  * \sa SDL_GetShapedWindowMode
121  */
122 extern DECLSPEC int SDLCALL SDL_SetWindowShape(SDL_Window *window,SDL_Surface *shape,SDL_WindowShapeMode *shape_mode);
123 
124 /**
125  * Get the shape parameters of a shaped window.
126  *
127  * \param window The shaped window whose parameters should be retrieved.
128  * \param shape_mode An empty shape-mode structure to fill, or NULL to check
129  * whether the window has a shape.
130  * \return 0 if the window has a shape and, provided shape_mode was not NULL,
131  * shape_mode has been filled with the mode data,
132  * SDL_NONSHAPEABLE_WINDOW if the SDL_Window given is not a shaped
133  * window, or SDL_WINDOW_LACKS_SHAPE if the SDL_Window given is a
134  * shapeable window currently lacking a shape.
135  *
136  * \sa SDL_WindowShapeMode
137  * \sa SDL_SetWindowShape
138  */
139 extern DECLSPEC int SDLCALL SDL_GetShapedWindowMode(SDL_Window *window,SDL_WindowShapeMode *shape_mode);
140 
141 /* Ends C function definitions when using C++ */
142 #ifdef __cplusplus
143 }
144 #endif
145 #include "close_code.h"
146 
147 #endif /* SDL_shape_h_ */
SDL_Window * SDL_CreateShapedWindow(const char *title, unsigned int x, unsigned int y, unsigned int w, unsigned int h, Uint32 flags)
SDL_bool
Definition: SDL_stdinc.h:167
A collection of pixels used in software blitting.
Definition: SDL_surface.h:70
A color key is applied.
Definition: SDL_shape.h:89
uint32_t Uint32
Definition: SDL_stdinc.h:209
int SDL_GetShapedWindowMode(SDL_Window *window, SDL_WindowShapeMode *shape_mode)
WindowShapeMode
An enum denoting the specific type of contents present in an SDL_WindowShapeParams union...
Definition: SDL_shape.h:81
The default mode, a binarized alpha cutoff of 1.
Definition: SDL_shape.h:83
SDL_WindowShapeParams parameters
Window-shape parameters.
Definition: SDL_shape.h:106
SDL_bool SDL_IsShapedWindow(const SDL_Window *window)
struct SDL_Window SDL_Window
The type used to identify a window.
Definition: SDL_video.h:95
A binarized alpha cutoff with a given integer value.
Definition: SDL_shape.h:85
SDL_Color colorKey
Definition: SDL_shape.h:98
A binarized alpha cutoff with a given integer value, but with the opposite comparison.
Definition: SDL_shape.h:87
Uint8 binarizationCutoff
A cutoff alpha value for binarization of the window shape&#39;s alpha channel.
Definition: SDL_shape.h:97
A struct that tags the SDL_WindowShapeParams union with an enum describing the type of its contents...
Definition: SDL_shape.h:102
A union containing parameters for shaped windows.
Definition: SDL_shape.h:95
WindowShapeMode mode
The mode of these window-shape parameters.
Definition: SDL_shape.h:104
uint8_t Uint8
Definition: SDL_stdinc.h:185
int SDL_SetWindowShape(SDL_Window *window, SDL_Surface *shape, SDL_WindowShapeMode *shape_mode)