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annotate src/core/painter.h @ 117:445035ace840

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core: fix panic handling early
author David Demelier <markand@malikania.fr>
date Sat, 03 Oct 2020 19:03:22 +0200
parents ed1a6bb02a78
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * painter.h -- basic drawing routines
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3 *
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4 * Copyright (c) 2020 David Demelier <markand@malikania.fr>
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5 *
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6 * Permission to use, copy, modify, and/or distribute this software for any
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7 * purpose with or without fee is hereby granted, provided that the above
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8 * copyright notice and this permission notice appear in all copies.
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9 *
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
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19 #ifndef MOLKO_PAINTER_H
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20 #define MOLKO_PAINTER_H
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21
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22 /**
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23 * \file painter.h
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24 * \brief Basic drawing routines.
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25 * \ingroup drawing
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26 */
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27
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28 #include <stdbool.h>
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30 struct texture;
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31
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32 /**
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33 * Give the current texture being used for rendering, maybe NULL if the
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34 * rendering is on root.
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35 *
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36 * \return Texture or NULL.
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37 */
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38 struct texture *
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39 painter_get_target(void);
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40
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41 /**
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42 * Set the rendering context to the given texture.
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43 *
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44 * Since this function change an internal global variable it is strongly
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45 * encouraged to store a local backup of the current texture using \a
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46 * painter_get_target and call this function with it afterwards.
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47 *
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48 * If texture is NULL, use default context aka the window.
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49 *
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50 * \param tex the texture
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51 * \see \ref PAINTER_BEGIN
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52 * \see \ref PAINTER_END
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53 */
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54 void
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55 painter_set_target(struct texture *tex);
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56
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57 /**
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58 * Get the current drawing color.
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59 *
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60 * \return the color in RRGGBBAA format
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61 */
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62 unsigned long
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63 painter_get_color(void);
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64
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65 /**
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66 * Set the rendering drawing color.
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67 *
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68 * \param color in RRGGBBAA format
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69 */
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70 void
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71 painter_set_color(unsigned long color);
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72
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73 /**
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74 * Draw a line.
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75 *
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76 * \param x1 first X coordinate
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77 * \param y1 first Y coordinate
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78 * \param x2 second X coordinate
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79 * \param y2 second Y coordinate
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80 */
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81 void
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82 painter_draw_line(int x1, int y1, int x2, int y2);
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83
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84 /**
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85 * Draw a pixel point.
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86 *
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87 * \param x the X coordinate
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88 * \param y the Y coordinate
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89 */
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90 void
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91 painter_draw_point(int x, int y);
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92
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93 /**
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94 * Draw a rectangle
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95 *
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96 * \param x the X coordinate
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97 * \param y the Y coordinate
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98 * \param w the rectangle width
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99 * \param h the rectangle height
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100 */
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101 void
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102 painter_draw_rectangle(int x, int y, unsigned int w, unsigned int h);
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103
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104 void
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105 painter_draw_circle(int x, int y, int radius);
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106
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107 /**
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108 * Clear the window.
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109 */
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110 void
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111 painter_clear(void);
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112
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113 /**
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114 * Present the window, only call this function one time in the main loop.
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115 */
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116 void
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117 painter_present(void);
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118
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119 /**
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120 * Use this macro to start painting on the texture to store the current
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121 * rendering context and put it back afterwards.
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122 *
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123 * \pre tex != NULL
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124 * \param tex the texture to use
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125 * \see \ref PAINTER_END
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126 */
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127 #define PAINTER_BEGIN(tex ) \
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128 do { \
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129 struct texture *__current_texture__; \
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130 \
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131 __current_texture__ = painter_get_target(); \
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132 painter_set_target((tex))
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133
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134 /**
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135 * Use this macro at the end of rendering into a given texture.
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136 *
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137 * \see \ref PAINTER_BEGIN
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138 */
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139 #define PAINTER_END() \
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140 painter_set_target(__current_texture__); \
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141 } while (0)
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142
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143 #endif /* !MOLKO_PAINTER_H */