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annotate DPF-Prymula-audioplugins/dpf/dgl/Cairo.hpp @ 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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3
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1 /*
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2 * DISTRHO Plugin Framework (DPF)
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3 * Copyright (C) 2012-2022 Filipe Coelho <falktx@falktx.com>
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4 *
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5 * Permission to use, copy, modify, and/or distribute this software for any purpose with
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6 * or without fee is hereby granted, provided that the above copyright notice and this
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7 * permission notice appear in all copies.
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8 *
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9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
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10 * TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
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11 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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12 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
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13 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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14 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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15 */
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16
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17 #ifndef DGL_CAIRO_HPP_INCLUDED
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18 #define DGL_CAIRO_HPP_INCLUDED
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19
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20 #include "ImageBase.hpp"
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21 #include "ImageBaseWidgets.hpp"
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22
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23 #include <cairo.h>
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24
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25 START_NAMESPACE_DGL
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26
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27 // --------------------------------------------------------------------------------------------------------------------
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28
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29 /**
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30 Cairo Graphics context.
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31 */
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32 struct CairoGraphicsContext : GraphicsContext
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33 {
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34 cairo_t* handle;
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35 };
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36
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37 // --------------------------------------------------------------------------------------------------------------------
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38
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39 /**
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40 Cairo Image class.
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41
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42 TODO ...
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43 */
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44 class CairoImage : public ImageBase
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45 {
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46 public:
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47 /**
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48 Constructor for a null Image.
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49 */
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50 CairoImage();
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51
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52 /**
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53 Constructor using raw image data.
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54 @note @a rawData must remain valid for the lifetime of this Image.
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55 */
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56 CairoImage(const char* rawData, uint width, uint height, ImageFormat format);
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57
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58 /**
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59 Constructor using raw image data.
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60 @note @a rawData must remain valid for the lifetime of this Image.
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61 */
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62 CairoImage(const char* rawData, const Size<uint>& size, ImageFormat format);
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63
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64 /**
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65 Constructor using another image data.
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66 */
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67 CairoImage(const CairoImage& image);
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68
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69 /**
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70 Destructor.
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71 */
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72 ~CairoImage() override;
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73
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74 /**
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75 Load raw image data from memory.
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76 @note @a rawData must remain valid for the lifetime of this Image.
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77 */
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78 void loadFromMemory(const char* rawData,
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79 const Size<uint>& size,
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80 ImageFormat format = kImageFormatBGRA) noexcept override;
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81
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82 /**
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83 Load PNG image from memory.
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84 Image size is read from PNG contents.
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85 @note @a pngData must remain valid for the lifetime of this Image.
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86 */
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87 void loadFromPNG(const char* pngData, uint dataSize) noexcept;
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88
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89 /**
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90 Draw this image at position @a pos using the graphics context @a context.
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91 */
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92 void drawAt(const GraphicsContext& context, const Point<int>& pos) override;
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93
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94 /**
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95 Get the cairo surface currently associated with this image.
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96 FIXME might be removed
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97 */
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98 inline cairo_surface_t* getSurface() const noexcept
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99 {
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100 return surface;
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101 }
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102
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103 /**
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104 TODO document this.
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105 */
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106 CairoImage& operator=(const CairoImage& image) noexcept;
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107
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108 // FIXME this should not be needed
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109 inline void loadFromMemory(const char* rdata, uint w, uint h, ImageFormat fmt = kImageFormatBGRA)
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110 { loadFromMemory(rdata, Size<uint>(w, h), fmt); };
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111 inline void draw(const GraphicsContext& context)
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112 { drawAt(context, Point<int>(0, 0)); };
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113 inline void drawAt(const GraphicsContext& context, int x, int y)
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114 { drawAt(context, Point<int>(x, y)); };
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115
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116 private:
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117 cairo_surface_t* surface;
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118 uchar* surfacedata;
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119 int* datarefcount;
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120 };
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121
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122 // --------------------------------------------------------------------------------------------------------------------
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123
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124 /**
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125 CairoWidget, handy class that takes graphics context during onDisplay and passes it in a new function.
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126 */
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127 template <class BaseWidget>
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128 class CairoBaseWidget : public BaseWidget
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129 {
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130 public:
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131 /**
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132 Constructor for a CairoSubWidget.
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133 */
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134 explicit CairoBaseWidget(Widget* const parentGroupWidget);
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135
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136 /**
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137 Constructor for a CairoTopLevelWidget.
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138 */
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139 explicit CairoBaseWidget(Window& windowToMapTo);
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140
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141 /**
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142 Constructor for a CairoStandaloneWindow without parent window.
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143 */
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144 explicit CairoBaseWidget(Application& app);
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145
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146 /**
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147 Constructor for a CairoStandaloneWindow with parent window.
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148 */
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149 explicit CairoBaseWidget(Application& app, Window& parentWindow);
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150
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151 /**
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152 Destructor.
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153 */
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154 ~CairoBaseWidget() override {}
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155
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156 protected:
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157 /**
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158 New virtual onDisplay function.
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159 @see onDisplay
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160 */
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161 virtual void onCairoDisplay(const CairoGraphicsContext& context) = 0;
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162
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163 private:
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164 /**
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165 Widget display function.
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166 Implemented internally to pass context into the drawing function.
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167 */
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168 void onDisplay() override
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169 {
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170 const CairoGraphicsContext& context((const CairoGraphicsContext&)BaseWidget::getGraphicsContext());
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171 onCairoDisplay(context);
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172 }
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173
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174 DISTRHO_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(CairoBaseWidget);
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175 };
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176
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177 typedef CairoBaseWidget<SubWidget> CairoSubWidget;
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178 typedef CairoBaseWidget<TopLevelWidget> CairoTopLevelWidget;
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179 typedef CairoBaseWidget<StandaloneWindow> CairoStandaloneWindow;
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180
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181 // --------------------------------------------------------------------------------------------------------------------
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182
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183 typedef ImageBaseAboutWindow<CairoImage> CairoImageAboutWindow;
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184 typedef ImageBaseButton<CairoImage> CairoImageButton;
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185 typedef ImageBaseKnob<CairoImage> CairoImageKnob;
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186 typedef ImageBaseSlider<CairoImage> CairoImageSlider;
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187 typedef ImageBaseSwitch<CairoImage> CairoImageSwitch;
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188
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189 // --------------------------------------------------------------------------------------------------------------------
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190
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191 END_NAMESPACE_DGL
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192
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193 #endif