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annotate DPF-Prymula-audioplugins/dpf/distrho/src/clap/ext/gui.h @ 3:84e66ea83026

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DPF-Prymula-audioplugins-0.231015-2
author prymula <prymula76@outlook.com>
date Mon, 16 Oct 2023 21:53:34 +0200
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1 #pragma once
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2
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3 #include "../plugin.h"
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4
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5 /// @page GUI
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6 ///
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7 /// This extension defines how the plugin will present its GUI.
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8 ///
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9 /// There are two approaches:
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10 /// 1. the plugin creates a window and embeds it into the host's window
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11 /// 2. the plugin creates a floating window
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12 ///
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13 /// Embedding the window gives more control to the host, and feels more integrated.
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14 /// Floating window are sometimes the only option due to technical limitations.
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15 ///
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16 /// Showing the GUI works as follow:
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17 /// 1. clap_plugin_gui->is_api_supported(), check what can work
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18 /// 2. clap_plugin_gui->create(), allocates gui resources
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19 /// 3. if the plugin window is floating
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20 /// 4. -> clap_plugin_gui->set_transient()
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21 /// 5. -> clap_plugin_gui->suggest_title()
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22 /// 6. else
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23 /// 7. -> clap_plugin_gui->set_scale()
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24 /// 8. -> clap_plugin_gui->can_resize()
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25 /// 9. -> if resizable and has known size from previous session, clap_plugin_gui->set_size()
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26 /// 10. -> else clap_plugin_gui->get_size(), gets initial size
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27 /// 11. -> clap_plugin_gui->set_parent()
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28 /// 12. clap_plugin_gui->show()
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29 /// 13. clap_plugin_gui->hide()/show() ...
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30 /// 14. clap_plugin_gui->destroy() when done with the gui
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31 ///
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32 /// Resizing the window (initiated by the plugin, if embedded):
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33 /// 1. Plugins calls clap_host_gui->request_resize()
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34 /// 2. If the host returns true the new size is accepted,
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35 /// the host doesn't have to call clap_plugin_gui->set_size().
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36 /// If the host returns false, the new size is rejected.
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37 ///
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38 /// Resizing the window (drag, if embedded)):
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39 /// 1. Only possible if clap_plugin_gui->can_resize() returns true
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40 /// 2. Mouse drag -> new_size
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41 /// 3. clap_plugin_gui->adjust_size(new_size) -> working_size
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42 /// 4. clap_plugin_gui->set_size(working_size)
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43
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44 static CLAP_CONSTEXPR const char CLAP_EXT_GUI[] = "clap.gui";
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45
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46 // If your windowing API is not listed here, please open an issue and we'll figure it out.
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47 // https://github.com/free-audio/clap/issues/new
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48
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49 // uses physical size
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50 // embed using https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-setparent
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51 static const CLAP_CONSTEXPR char CLAP_WINDOW_API_WIN32[] = "win32";
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52
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53 // uses logical size, don't call clap_plugin_gui->set_scale()
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54 static const CLAP_CONSTEXPR char CLAP_WINDOW_API_COCOA[] = "cocoa";
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55
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56 // uses physical size
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57 // embed using https://specifications.freedesktop.org/xembed-spec/xembed-spec-latest.html
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58 static const CLAP_CONSTEXPR char CLAP_WINDOW_API_X11[] = "x11";
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59
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60 // uses physical size
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61 // embed is currently not supported, use floating windows
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62 static const CLAP_CONSTEXPR char CLAP_WINDOW_API_WAYLAND[] = "wayland";
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63
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64 #ifdef __cplusplus
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65 extern "C" {
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66 #endif
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67
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68 typedef void *clap_hwnd;
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69 typedef void *clap_nsview;
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70 typedef unsigned long clap_xwnd;
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71
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72 // Represent a window reference.
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73 typedef struct clap_window {
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74 const char *api; // one of CLAP_WINDOW_API_XXX
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75 union {
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76 clap_nsview cocoa;
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77 clap_xwnd x11;
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78 clap_hwnd win32;
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79 void *ptr; // for anything defined outside of clap
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80 uintptr_t uptr;
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81 };
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82 } clap_window_t;
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83
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84 // Information to improve window resizing when initiated by the host or window manager.
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85 typedef struct clap_gui_resize_hints {
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86 bool can_resize_horizontally;
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87 bool can_resize_vertically;
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88
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89 // only if can resize horizontally and vertically
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90 bool preserve_aspect_ratio;
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91 uint32_t aspect_ratio_width;
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92 uint32_t aspect_ratio_height;
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93 } clap_gui_resize_hints_t;
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94
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95 // Size (width, height) is in pixels; the corresponding windowing system extension is
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96 // responsible for defining if it is physical pixels or logical pixels.
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97 typedef struct clap_plugin_gui {
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98 // Returns true if the requested gui api is supported
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99 // [main-thread]
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100 bool(CLAP_ABI *is_api_supported)(const clap_plugin_t *plugin, const char *api, bool is_floating);
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101
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102 // Returns true if the plugin has a preferred api.
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103 // The host has no obligation to honor the plugin preferrence, this is just a hint.
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104 // The const char **api variable should be explicitly assigned as a pointer to
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105 // one of the CLAP_WINDOW_API_ constants defined above, not strcopied.
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106 // [main-thread]
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107 bool(CLAP_ABI *get_preferred_api)(const clap_plugin_t *plugin,
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108 const char **api,
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109 bool *is_floating);
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110
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111 // Create and allocate all resources necessary for the gui.
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112 //
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113 // If is_floating is true, then the window will not be managed by the host. The plugin
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114 // can set its window to stays above the parent window, see set_transient().
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115 // api may be null or blank for floating window.
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116 //
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117 // If is_floating is false, then the plugin has to embbed its window into the parent window, see
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118 // set_parent().
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119 //
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120 // After this call, the GUI may not be visible yet; don't forget to call show().
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121 // [main-thread]
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122 bool(CLAP_ABI *create)(const clap_plugin_t *plugin, const char *api, bool is_floating);
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123
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124 // Free all resources associated with the gui.
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125 // [main-thread]
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126 void(CLAP_ABI *destroy)(const clap_plugin_t *plugin);
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127
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128 // Set the absolute GUI scaling factor, and override any OS info.
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129 // Should not be used if the windowing api relies upon logical pixels.
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130 //
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131 // If the plugin prefers to work out the scaling factor itself by querying the OS directly,
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132 // then ignore the call.
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133 //
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134 // Returns true if the scaling could be applied
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135 // Returns false if the call was ignored, or the scaling could not be applied.
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136 // [main-thread]
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137 bool(CLAP_ABI *set_scale)(const clap_plugin_t *plugin, double scale);
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138
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139 // Get the current size of the plugin UI.
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140 // clap_plugin_gui->create() must have been called prior to asking the size.
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141 // [main-thread]
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142 bool(CLAP_ABI *get_size)(const clap_plugin_t *plugin, uint32_t *width, uint32_t *height);
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143
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144 // Returns true if the window is resizeable (mouse drag).
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145 // Only for embedded windows.
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146 // [main-thread]
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147 bool(CLAP_ABI *can_resize)(const clap_plugin_t *plugin);
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148
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149 // Returns true if the plugin can provide hints on how to resize the window.
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150 // [main-thread]
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151 bool(CLAP_ABI *get_resize_hints)(const clap_plugin_t *plugin, clap_gui_resize_hints_t *hints);
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152
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153 // If the plugin gui is resizable, then the plugin will calculate the closest
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154 // usable size which fits in the given size.
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155 // This method does not change the size.
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156 //
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157 // Only for embedded windows.
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158 // [main-thread]
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159 bool(CLAP_ABI *adjust_size)(const clap_plugin_t *plugin, uint32_t *width, uint32_t *height);
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160
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161 // Sets the window size. Only for embedded windows.
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162 // [main-thread]
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163 bool(CLAP_ABI *set_size)(const clap_plugin_t *plugin, uint32_t width, uint32_t height);
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164
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165 // Embbeds the plugin window into the given window.
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166 // [main-thread & !floating]
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167 bool(CLAP_ABI *set_parent)(const clap_plugin_t *plugin, const clap_window_t *window);
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168
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169 // Set the plugin floating window to stay above the given window.
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170 // [main-thread & floating]
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171 bool(CLAP_ABI *set_transient)(const clap_plugin_t *plugin, const clap_window_t *window);
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172
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173 // Suggests a window title. Only for floating windows.
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174 // [main-thread & floating]
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175 void(CLAP_ABI *suggest_title)(const clap_plugin_t *plugin, const char *title);
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176
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177 // Show the window.
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178 // [main-thread]
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179 bool(CLAP_ABI *show)(const clap_plugin_t *plugin);
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180
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181 // Hide the window, this method does not free the resources, it just hides
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182 // the window content. Yet it may be a good idea to stop painting timers.
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183 // [main-thread]
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184 bool(CLAP_ABI *hide)(const clap_plugin_t *plugin);
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185 } clap_plugin_gui_t;
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186
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187 typedef struct clap_host_gui {
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188 // The host should call get_resize_hints() again.
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189 // [thread-safe]
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190 void(CLAP_ABI *resize_hints_changed)(const clap_host_t *host);
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191
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diff changeset
192 /* Request the host to resize the client area to width, height.
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parents:
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193 * Return true if the new size is accepted, false otherwise.
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parents:
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194 * The host doesn't have to call set_size().
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195 *
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196 * Note: if not called from the main thread, then a return value simply means that the host
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197 * acknowledged the request and will process it asynchronously. If the request then can't be
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parents:
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198 * satisfied then the host will call set_size() to revert the operation.
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199 *
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200 * [thread-safe] */
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parents:
diff changeset
201 bool(CLAP_ABI *request_resize)(const clap_host_t *host, uint32_t width, uint32_t height);
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202
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parents:
diff changeset
203 /* Request the host to show the plugin gui.
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204 * Return true on success, false otherwise.
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205 * [thread-safe] */
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parents:
diff changeset
206 bool(CLAP_ABI *request_show)(const clap_host_t *host);
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diff changeset
207
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diff changeset
208 /* Request the host to hide the plugin gui.
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209 * Return true on success, false otherwise.
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210 * [thread-safe] */
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211 bool(CLAP_ABI *request_hide)(const clap_host_t *host);
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diff changeset
212
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213 // The floating window has been closed, or the connection to the gui has been lost.
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214 //
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215 // If was_destroyed is true, then the host must call clap_plugin_gui->destroy() to acknowledge
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216 // the gui destruction.
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parents:
diff changeset
217 // [thread-safe]
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diff changeset
218 void(CLAP_ABI *closed)(const clap_host_t *host, bool was_destroyed);
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219 } clap_host_gui_t;
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220
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diff changeset
221 #ifdef __cplusplus
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222 }
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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223 #endif