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annotate include/SDL_shape.h @ 4779:bb179250fcb3

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author Eli Gottlieb <eligottlieb@gmail.com>
date Thu, 10 Jun 2010 17:50:38 -0400
parents 9838d3525a1b
children 4f915a47b995
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 2010 Eli Gottlieb
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Eli Gottlieb
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20 eligottlieb@gmail.com
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21 */
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22
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23 #ifndef _SDL_shape_h
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24 #define _SDL_shape_h
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25
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26 #include "SDL_stdinc.h"
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27 #include "SDL_pixels.h"
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28 #include "SDL_rect.h"
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29 #include "SDL_surface.h"
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30 #include "SDL_video.h"
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31
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32 #include "begin_code.h"
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33 /* Set up for C function definitions, even when using C++ */
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34 #ifdef __cplusplus
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35 /* *INDENT-OFF* */
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36 extern "C" {
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37 /* *INDENT-ON* */
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38 #endif
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39
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40 /** \file SDL_shape.h
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41 *
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42 * Header file for shaped windows.
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43 */
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44
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45 /**
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46 * \brief Create a shaped window with the specified position, dimensions, and flags.
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47 *
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48 * \param title The title of the window, in UTF-8 encoding.
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49 * \param x The x position of the window, ::SDL_WINDOWPOS_CENTERED, or
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50 * ::SDL_WINDOWPOS_UNDEFINED.
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51 * \param y The y position of the window, ::SDL_WINDOWPOS_CENTERED, or
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52 * ::SDL_WINDOWPOS_UNDEFINED.
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53 * \param w The width of the window.
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54 * \param h The height of the window.
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55 * \param flags The flags for the window, a mask of SDL_WINDOW_BORDERLESS with any of the following:
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56 * ::SDL_WINDOW_OPENGL, ::SDL_WINDOW_INPUT_GRABBED,
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57 * ::SDL_WINDOW_SHOWN, ::SDL_WINDOW_RESIZABLE,
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58 * ::SDL_WINDOW_MAXIMIZED, ::SDL_WINDOW_MINIMIZED,
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59 * ::SDL_WINDOW_BORDERLESS is always set, and ::SDL_WINDOW_FULLSCREEN is always unset.
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60 *
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61 * \return The id of the window created, or zero if window creation failed.
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62 *
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63 * \sa SDL_DestroyWindow()
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64 */
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65 extern DECLSPEC SDL_Window * SDLCALL SDL_CreateShapedWindow(const char *title,unsigned int x,unsigned int y,unsigned int w,unsigned int h,Uint32 flags);
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66
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67 /**
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68 * \brief Return whether the given window is a shaped window.
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69 *
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70 * \param window The window to query for being shaped.
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71 *
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72 * \return SDL_TRUE if the window is a shaped window and SDL_FALSE otherwise.
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73 * \sa SDL_CreateShapedWindow
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74 */
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75 extern DECLSPEC SDL_bool SDLCALL SDL_WindowIsShaped(const SDL_Window *window);
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76
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77 /**
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78 * \brief Select the shape of a given window as a rendering target.
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79 *
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80 * \param window The window whose shape should become the current rendering target.
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81 *
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82 * \return 0 on success, -1 if something other than a valid shaped window is passed into \c window.
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83 *
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84 * The shape of the window given in \c window is selected as the new render target, and in the default mode (see
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85 * SDL_WindowShapeParams) the alpha channel of that render target determines which pixels of the window are part of its
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86 * visible shape and which are not according to a cutoff value. All normal SDL rendering functions can be used on it,
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87 * and its own specific parameters can be examined and set with SDL_GetShapeParameters() and SDL_SetShapeParameters().
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88 * The final shape will be computed and the actual appearance of the window changed only upon a call to
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89 * SDL_RenderPresent().
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90 *
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91 * \sa SDL_GetShapeParameters
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92 * \sa SDL_SetShapeParameters
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93 * \sa SDL_RenderPresent
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94 */
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95 extern DECLSPEC int SDLCALL SDL_SelectShapeRenderer(const SDL_Window *window);
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96
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97 /** \brief An enum denoting the specific type of contents present in an SDL_WindowShapeParams union. */
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98 typedef enum {ShapeModeDefault, ShapeModeBinarizeAlpha} WindowShapeMode;
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99 /** \brief A union containing parameters for shaped windows. */
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100 typedef union {
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101 /** \brief a cutoff alpha value for binarization of the window shape's alpha channel. */
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102 Uint8 binarizationCutoff;
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103 } SDL_WindowShapeParams;
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104
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105 /** \brief A struct that tags the SDL_WindowShapeParams union with an enum describing the type of its contents. */
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106 typedef struct SDL_WindowShapeMode {
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107 /** \brief The mode of these window-shape parameters. */
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108 WindowShapeMode mode;
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109 /** \brief Window-shape parameters. */
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110 SDL_WindowShapeParams parameters;
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111 } SDL_WindowShapeMode;
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112
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113 /**
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114 * \brief Set the shape parameters of a shaped window.
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115 *
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116 * \param window The shaped window whose parameters should be set.
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117 * \param shapeMode The parameters to set for the shaped window.
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118 *
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119 * \return 0 on success, -1 on invalid parameters in the shapeMode argument, or -2 if the SDL_Window given is not a
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120 * shaped window.
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121 *
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122 * \sa SDL_WindowShapeMode
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123 * \sa SDL_GetShapeParameters
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124 */
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125 extern DECLSPEC int SDLCALL SDL_SetShapeParameters(SDL_Window *window,SDL_WindowShapeMode shapeMode);
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126
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127 /**
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128 * \brief Set the shape parameters of a shaped window.
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129 *
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130 * \param window The shaped window whose parameters should be retrieved.
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131 * \param shapeMode An empty shape-parameters structure to fill.
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132 *
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133 * \return 0 on success, -1 on a null shapeMode, or -2 if the SDL_Window given is not a shaped window.
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134 *
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135 * \sa SDL_WindowShapeMode
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136 * \sa SDL_SetShapeParameters
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137 */
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138 extern DECLSPEC int SDLCALL SDL_GetShapeParameters(SDL_Window *window,SDL_WindowShapeMode *shapeMode);
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139
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140 /* Ends C function definitions when using C++ */
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141 #ifdef __cplusplus
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142 /* *INDENT-OFF* */
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143 }
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144 /* *INDENT-ON* */
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145 #endif
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146 #include "close_code.h"
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147
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148 #endif /* _SDL_shape_h */