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annotate DPF-Prymula-audioplugins/dpf/dgl/src/nanovg/nanovg.h @ 3:84e66ea83026
DPF-Prymula-audioplugins-0.231015-2
author | prymula <prymula76@outlook.com> |
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date | Mon, 16 Oct 2023 21:53:34 +0200 |
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1 // |
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2 // Copyright (c) 2013 Mikko Mononen memon@inside.org |
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3 // |
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4 // This software is provided 'as-is', without any express or implied |
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5 // warranty. In no event will the authors be held liable for any damages |
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6 // arising from the use of this software. |
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7 // Permission is granted to anyone to use this software for any purpose, |
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8 // including commercial applications, and to alter it and redistribute it |
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9 // freely, subject to the following restrictions: |
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10 // 1. The origin of this software must not be misrepresented; you must not |
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11 // claim that you wrote the original software. If you use this software |
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12 // in a product, an acknowledgment in the product documentation would be |
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13 // appreciated but is not required. |
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14 // 2. Altered source versions must be plainly marked as such, and must not be |
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15 // misrepresented as being the original software. |
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16 // 3. This notice may not be removed or altered from any source distribution. |
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17 // |
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18 |
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19 #ifndef NANOVG_H |
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20 #define NANOVG_H |
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21 |
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22 #ifdef __cplusplus |
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23 extern "C" { |
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24 #endif |
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25 |
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26 #define NVG_PI 3.14159265358979323846264338327f |
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27 |
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28 #ifdef _MSC_VER |
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29 #pragma warning(push) |
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30 #pragma warning(disable: 4201) // nonstandard extension used : nameless struct/union |
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31 #endif |
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32 |
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33 typedef struct NVGcontext NVGcontext; |
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34 |
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35 struct NVGcolor { |
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36 union { |
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37 float rgba[4]; |
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38 struct { |
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39 float r,g,b,a; |
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40 }; |
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41 }; |
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42 }; |
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43 typedef struct NVGcolor NVGcolor; |
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44 |
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45 struct NVGpaint { |
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46 float xform[6]; |
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47 float extent[2]; |
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48 float radius; |
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49 float feather; |
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50 NVGcolor innerColor; |
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51 NVGcolor outerColor; |
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52 int image; |
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53 }; |
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54 typedef struct NVGpaint NVGpaint; |
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55 |
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56 enum NVGwinding { |
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57 NVG_CCW = 1, // Winding for solid shapes |
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58 NVG_CW = 2, // Winding for holes |
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59 }; |
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60 |
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61 enum NVGsolidity { |
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62 NVG_SOLID = 1, // CCW |
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63 NVG_HOLE = 2, // CW |
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64 }; |
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65 |
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66 enum NVGlineCap { |
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67 NVG_BUTT, |
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68 NVG_ROUND, |
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69 NVG_SQUARE, |
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70 NVG_BEVEL, |
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71 NVG_MITER, |
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72 }; |
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73 |
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74 enum NVGalign { |
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75 // Horizontal align |
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76 NVG_ALIGN_LEFT = 1<<0, // Default, align text horizontally to left. |
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77 NVG_ALIGN_CENTER = 1<<1, // Align text horizontally to center. |
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78 NVG_ALIGN_RIGHT = 1<<2, // Align text horizontally to right. |
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79 // Vertical align |
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80 NVG_ALIGN_TOP = 1<<3, // Align text vertically to top. |
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81 NVG_ALIGN_MIDDLE = 1<<4, // Align text vertically to middle. |
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82 NVG_ALIGN_BOTTOM = 1<<5, // Align text vertically to bottom. |
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83 NVG_ALIGN_BASELINE = 1<<6, // Default, align text vertically to baseline. |
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84 }; |
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85 |
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86 enum NVGblendFactor { |
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87 NVG_ZERO = 1<<0, |
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88 NVG_ONE = 1<<1, |
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89 NVG_SRC_COLOR = 1<<2, |
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90 NVG_ONE_MINUS_SRC_COLOR = 1<<3, |
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91 NVG_DST_COLOR = 1<<4, |
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92 NVG_ONE_MINUS_DST_COLOR = 1<<5, |
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93 NVG_SRC_ALPHA = 1<<6, |
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94 NVG_ONE_MINUS_SRC_ALPHA = 1<<7, |
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95 NVG_DST_ALPHA = 1<<8, |
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96 NVG_ONE_MINUS_DST_ALPHA = 1<<9, |
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97 NVG_SRC_ALPHA_SATURATE = 1<<10, |
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98 }; |
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99 |
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100 enum NVGcompositeOperation { |
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101 NVG_SOURCE_OVER, |
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102 NVG_SOURCE_IN, |
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103 NVG_SOURCE_OUT, |
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104 NVG_ATOP, |
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105 NVG_DESTINATION_OVER, |
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106 NVG_DESTINATION_IN, |
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107 NVG_DESTINATION_OUT, |
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108 NVG_DESTINATION_ATOP, |
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109 NVG_LIGHTER, |
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110 NVG_COPY, |
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111 NVG_XOR, |
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112 }; |
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113 |
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114 struct NVGcompositeOperationState { |
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115 int srcRGB; |
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116 int dstRGB; |
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117 int srcAlpha; |
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118 int dstAlpha; |
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119 }; |
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120 typedef struct NVGcompositeOperationState NVGcompositeOperationState; |
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121 |
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122 struct NVGglyphPosition { |
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123 const char* str; // Position of the glyph in the input string. |
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124 float x; // The x-coordinate of the logical glyph position. |
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125 float minx, maxx; // The bounds of the glyph shape. |
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126 }; |
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127 typedef struct NVGglyphPosition NVGglyphPosition; |
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128 |
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129 struct NVGtextRow { |
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130 const char* start; // Pointer to the input text where the row starts. |
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131 const char* end; // Pointer to the input text where the row ends (one past the last character). |
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132 const char* next; // Pointer to the beginning of the next row. |
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133 float width; // Logical width of the row. |
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134 float minx, maxx; // Actual bounds of the row. Logical with and bounds can differ because of kerning and some parts over extending. |
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135 }; |
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136 typedef struct NVGtextRow NVGtextRow; |
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137 |
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138 enum NVGimageFlags { |
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139 NVG_IMAGE_GENERATE_MIPMAPS = 1<<0, // Generate mipmaps during creation of the image. |
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140 NVG_IMAGE_REPEATX = 1<<1, // Repeat image in X direction. |
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141 NVG_IMAGE_REPEATY = 1<<2, // Repeat image in Y direction. |
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142 NVG_IMAGE_FLIPY = 1<<3, // Flips (inverses) image in Y direction when rendered. |
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143 NVG_IMAGE_PREMULTIPLIED = 1<<4, // Image data has premultiplied alpha. |
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144 NVG_IMAGE_NEAREST = 1<<5, // Image interpolation is Nearest instead Linear |
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145 }; |
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146 |
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147 enum NVGtexture { |
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148 NVG_TEXTURE_ALPHA, |
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149 NVG_TEXTURE_BGR, |
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150 NVG_TEXTURE_BGRA, |
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151 NVG_TEXTURE_RGB, |
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152 NVG_TEXTURE_RGBA, |
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153 }; |
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154 |
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155 // Begin drawing a new frame |
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156 // Calls to nanovg drawing API should be wrapped in nvgBeginFrame() & nvgEndFrame() |
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157 // nvgBeginFrame() defines the size of the window to render to in relation currently |
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158 // set viewport (i.e. glViewport on GL backends). Device pixel ration allows to |
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159 // control the rendering on Hi-DPI devices. |
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160 // For example, GLFW returns two dimension for an opened window: window size and |
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161 // frame buffer size. In that case you would set windowWidth/Height to the window size |
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162 // devicePixelRatio to: frameBufferWidth / windowWidth. |
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163 void nvgBeginFrame(NVGcontext* ctx, float windowWidth, float windowHeight, float devicePixelRatio); |
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164 |
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165 // Cancels drawing the current frame. |
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166 void nvgCancelFrame(NVGcontext* ctx); |
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167 |
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168 // Ends drawing flushing remaining render state. |
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169 void nvgEndFrame(NVGcontext* ctx); |
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170 |
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171 // |
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172 // Composite operation |
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173 // |
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174 // The composite operations in NanoVG are modeled after HTML Canvas API, and |
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175 // the blend func is based on OpenGL (see corresponding manuals for more info). |
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176 // The colors in the blending state have premultiplied alpha. |
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177 |
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178 // Sets the composite operation. The op parameter should be one of NVGcompositeOperation. |
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179 void nvgGlobalCompositeOperation(NVGcontext* ctx, int op); |
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180 |
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181 // Sets the composite operation with custom pixel arithmetic. The parameters should be one of NVGblendFactor. |
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182 void nvgGlobalCompositeBlendFunc(NVGcontext* ctx, int sfactor, int dfactor); |
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183 |
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184 // Sets the composite operation with custom pixel arithmetic for RGB and alpha components separately. The parameters should be one of NVGblendFactor. |
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185 void nvgGlobalCompositeBlendFuncSeparate(NVGcontext* ctx, int srcRGB, int dstRGB, int srcAlpha, int dstAlpha); |
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186 |
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187 // |
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188 // Color utils |
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189 // |
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190 // Colors in NanoVG are stored as unsigned ints in ABGR format. |
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191 |
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192 // Returns a color value from red, green, blue values. Alpha will be set to 255 (1.0f). |
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193 NVGcolor nvgRGB(unsigned char r, unsigned char g, unsigned char b); |
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194 |
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195 // Returns a color value from red, green, blue values. Alpha will be set to 1.0f. |
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196 NVGcolor nvgRGBf(float r, float g, float b); |
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197 |
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198 |
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199 // Returns a color value from red, green, blue and alpha values. |
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200 NVGcolor nvgRGBA(unsigned char r, unsigned char g, unsigned char b, unsigned char a); |
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201 |
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202 // Returns a color value from red, green, blue and alpha values. |
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203 NVGcolor nvgRGBAf(float r, float g, float b, float a); |
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204 |
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205 |
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206 // Linearly interpolates from color c0 to c1, and returns resulting color value. |
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207 NVGcolor nvgLerpRGBA(NVGcolor c0, NVGcolor c1, float u); |
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208 |
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209 // Sets transparency of a color value. |
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210 NVGcolor nvgTransRGBA(NVGcolor c0, unsigned char a); |
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211 |
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212 // Sets transparency of a color value. |
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213 NVGcolor nvgTransRGBAf(NVGcolor c0, float a); |
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214 |
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215 // Returns color value specified by hue, saturation and lightness. |
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216 // HSL values are all in range [0..1], alpha will be set to 255. |
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217 NVGcolor nvgHSL(float h, float s, float l); |
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218 |
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219 // Returns color value specified by hue, saturation and lightness and alpha. |
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220 // HSL values are all in range [0..1], alpha in range [0..255] |
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221 NVGcolor nvgHSLA(float h, float s, float l, unsigned char a); |
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222 |
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223 // |
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224 // State Handling |
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225 // |
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226 // NanoVG contains state which represents how paths will be rendered. |
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227 // The state contains transform, fill and stroke styles, text and font styles, |
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228 // and scissor clipping. |
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229 |
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230 // Pushes and saves the current render state into a state stack. |
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231 // A matching nvgRestore() must be used to restore the state. |
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232 void nvgSave(NVGcontext* ctx); |
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233 |
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234 // Pops and restores current render state. |
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235 void nvgRestore(NVGcontext* ctx); |
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236 |
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237 // Resets current render state to default values. Does not affect the render state stack. |
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238 void nvgReset(NVGcontext* ctx); |
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239 |
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240 // |
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241 // Render styles |
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242 // |
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243 // Fill and stroke render style can be either a solid color or a paint which is a gradient or a pattern. |
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244 // Solid color is simply defined as a color value, different kinds of paints can be created |
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245 // using nvgLinearGradient(), nvgBoxGradient(), nvgRadialGradient() and nvgImagePattern(). |
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246 // |
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247 // Current render style can be saved and restored using nvgSave() and nvgRestore(). |
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248 |
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249 // Sets whether to draw antialias for nvgStroke() and nvgFill(). It's enabled by default. |
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250 void nvgShapeAntiAlias(NVGcontext* ctx, int enabled); |
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251 |
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252 // Sets current stroke style to a solid color. |
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253 void nvgStrokeColor(NVGcontext* ctx, NVGcolor color); |
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254 |
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255 // Sets current stroke style to a paint, which can be a one of the gradients or a pattern. |
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256 void nvgStrokePaint(NVGcontext* ctx, NVGpaint paint); |
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257 |
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258 // Sets current fill style to a solid color. |
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259 void nvgFillColor(NVGcontext* ctx, NVGcolor color); |
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260 |
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261 // Sets current fill style to a paint, which can be a one of the gradients or a pattern. |
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262 void nvgFillPaint(NVGcontext* ctx, NVGpaint paint); |
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263 |
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264 // Sets the miter limit of the stroke style. |
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265 // Miter limit controls when a sharp corner is beveled. |
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266 void nvgMiterLimit(NVGcontext* ctx, float limit); |
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267 |
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268 // Sets the stroke width of the stroke style. |
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269 void nvgStrokeWidth(NVGcontext* ctx, float size); |
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270 |
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271 // Sets how the end of the line (cap) is drawn, |
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272 // Can be one of: NVG_BUTT (default), NVG_ROUND, NVG_SQUARE. |
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273 void nvgLineCap(NVGcontext* ctx, int cap); |
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274 |
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275 // Sets how sharp path corners are drawn. |
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276 // Can be one of NVG_MITER (default), NVG_ROUND, NVG_BEVEL. |
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277 void nvgLineJoin(NVGcontext* ctx, int join); |
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278 |
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279 // Sets the transparency applied to all rendered shapes. |
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280 // Already transparent paths will get proportionally more transparent as well. |
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281 void nvgGlobalAlpha(NVGcontext* ctx, float alpha); |
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282 void nvgGlobalTint(NVGcontext* ctx, NVGcolor tint); |
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283 NVGcolor nvgGetGlobalTint(NVGcontext* ctx); |
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284 void nvgAlpha(NVGcontext* ctx, float alpha); |
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285 void nvgTint(NVGcontext* ctx, NVGcolor tint); |
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286 |
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287 // |
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288 // Transforms |
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289 // |
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290 // The paths, gradients, patterns and scissor region are transformed by an transformation |
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291 // matrix at the time when they are passed to the API. |
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292 // The current transformation matrix is a affine matrix: |
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293 // [sx kx tx] |
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294 // [ky sy ty] |
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295 // [ 0 0 1] |
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296 // Where: sx,sy define scaling, kx,ky skewing, and tx,ty translation. |
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297 // The last row is assumed to be 0,0,1 and is not stored. |
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298 // |
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299 // Apart from nvgResetTransform(), each transformation function first creates |
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300 // specific transformation matrix and pre-multiplies the current transformation by it. |
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301 // |
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302 // Current coordinate system (transformation) can be saved and restored using nvgSave() and nvgRestore(). |
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303 |
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304 // Resets current transform to a identity matrix. |
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305 void nvgResetTransform(NVGcontext* ctx); |
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306 |
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307 // Premultiplies current coordinate system by specified matrix. |
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308 // The parameters are interpreted as matrix as follows: |
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309 // [a c e] |
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310 // [b d f] |
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311 // [0 0 1] |
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312 void nvgTransform(NVGcontext* ctx, float a, float b, float c, float d, float e, float f); |
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313 |
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314 // Translates current coordinate system. |
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315 void nvgTranslate(NVGcontext* ctx, float x, float y); |
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316 |
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317 // Rotates current coordinate system. Angle is specified in radians. |
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318 void nvgRotate(NVGcontext* ctx, float angle); |
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319 |
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320 // Skews the current coordinate system along X axis. Angle is specified in radians. |
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321 void nvgSkewX(NVGcontext* ctx, float angle); |
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322 |
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323 // Skews the current coordinate system along Y axis. Angle is specified in radians. |
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324 void nvgSkewY(NVGcontext* ctx, float angle); |
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325 |
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326 // Scales the current coordinate system. |
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327 void nvgScale(NVGcontext* ctx, float x, float y); |
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328 |
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329 // Stores the top part (a-f) of the current transformation matrix in to the specified buffer. |
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330 // [a c e] |
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331 // [b d f] |
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332 // [0 0 1] |
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333 // There should be space for 6 floats in the return buffer for the values a-f. |
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334 void nvgCurrentTransform(NVGcontext* ctx, float* xform); |
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335 |
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336 |
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337 // The following functions can be used to make calculations on 2x3 transformation matrices. |
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338 // A 2x3 matrix is represented as float[6]. |
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339 |
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340 // Sets the transform to identity matrix. |
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341 void nvgTransformIdentity(float* dst); |
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342 |
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343 // Sets the transform to translation matrix matrix. |
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344 void nvgTransformTranslate(float* dst, float tx, float ty); |
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345 |
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346 // Sets the transform to scale matrix. |
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347 void nvgTransformScale(float* dst, float sx, float sy); |
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348 |
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349 // Sets the transform to rotate matrix. Angle is specified in radians. |
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350 void nvgTransformRotate(float* dst, float a); |
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351 |
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352 // Sets the transform to skew-x matrix. Angle is specified in radians. |
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353 void nvgTransformSkewX(float* dst, float a); |
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354 |
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355 // Sets the transform to skew-y matrix. Angle is specified in radians. |
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356 void nvgTransformSkewY(float* dst, float a); |
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357 |
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358 // Sets the transform to the result of multiplication of two transforms, of A = A*B. |
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359 void nvgTransformMultiply(float* dst, const float* src); |
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360 |
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361 // Sets the transform to the result of multiplication of two transforms, of A = B*A. |
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362 void nvgTransformPremultiply(float* dst, const float* src); |
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363 |
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364 // Sets the destination to inverse of specified transform. |
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365 // Returns 1 if the inverse could be calculated, else 0. |
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366 int nvgTransformInverse(float* dst, const float* src); |
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367 |
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368 // Transform a point by given transform. |
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369 void nvgTransformPoint(float* dstx, float* dsty, const float* xform, float srcx, float srcy); |
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370 |
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371 // Converts degrees to radians and vice versa. |
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372 float nvgDegToRad(float deg); |
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373 float nvgRadToDeg(float rad); |
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374 |
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375 // |
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376 // Images |
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377 // |
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378 // NanoVG allows you to load jpg, png, psd, tga, pic and gif files to be used for rendering. |
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379 // In addition you can upload your own image. The image loading is provided by stb_image. |
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380 // The parameter imageFlags is combination of flags defined in NVGimageFlags. |
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381 |
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382 // Creates image by loading it from the disk from specified file name. |
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383 // Returns handle to the image. |
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384 int nvgCreateImage(NVGcontext* ctx, const char* filename, int imageFlags); |
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385 |
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386 // Creates image by loading it from the specified chunk of memory. |
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387 // Returns handle to the image. |
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388 int nvgCreateImageMem(NVGcontext* ctx, int imageFlags, const unsigned char* data, int ndata); |
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389 |
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390 // Creates image from specified image data and texture format. |
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391 // Returns handle to the image. |
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392 int nvgCreateImageRaw(NVGcontext* ctx, int w, int h, int imageFlags, enum NVGtexture format, const unsigned char* data); |
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393 |
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394 // Creates image from specified image data. |
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395 // Returns handle to the image. |
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396 int nvgCreateImageRGBA(NVGcontext* ctx, int w, int h, int imageFlags, const unsigned char* data); |
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397 |
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398 // Updates image data specified by image handle. |
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399 void nvgUpdateImage(NVGcontext* ctx, int image, const unsigned char* data); |
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400 |
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401 // Returns the dimensions of a created image. |
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402 void nvgImageSize(NVGcontext* ctx, int image, int* w, int* h); |
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403 |
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404 // Deletes created image. |
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405 void nvgDeleteImage(NVGcontext* ctx, int image); |
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406 |
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407 // |
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408 // Paints |
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409 // |
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410 // NanoVG supports four types of paints: linear gradient, box gradient, radial gradient and image pattern. |
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411 // These can be used as paints for strokes and fills. |
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412 |
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413 // Creates and returns a linear gradient. Parameters (sx,sy)-(ex,ey) specify the start and end coordinates |
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414 // of the linear gradient, icol specifies the start color and ocol the end color. |
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415 // The gradient is transformed by the current transform when it is passed to nvgFillPaint() or nvgStrokePaint(). |
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416 NVGpaint nvgLinearGradient(NVGcontext* ctx, float sx, float sy, float ex, float ey, |
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417 NVGcolor icol, NVGcolor ocol); |
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418 |
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419 // Creates and returns a box gradient. Box gradient is a feathered rounded rectangle, it is useful for rendering |
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420 // drop shadows or highlights for boxes. Parameters (x,y) define the top-left corner of the rectangle, |
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421 // (w,h) define the size of the rectangle, r defines the corner radius, and f feather. Feather defines how blurry |
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422 // the border of the rectangle is. Parameter icol specifies the inner color and ocol the outer color of the gradient. |
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423 // The gradient is transformed by the current transform when it is passed to nvgFillPaint() or nvgStrokePaint(). |
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424 NVGpaint nvgBoxGradient(NVGcontext* ctx, float x, float y, float w, float h, |
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425 float r, float f, NVGcolor icol, NVGcolor ocol); |
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426 |
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427 // Creates and returns a radial gradient. Parameters (cx,cy) specify the center, inr and outr specify |
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428 // the inner and outer radius of the gradient, icol specifies the start color and ocol the end color. |
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429 // The gradient is transformed by the current transform when it is passed to nvgFillPaint() or nvgStrokePaint(). |
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430 NVGpaint nvgRadialGradient(NVGcontext* ctx, float cx, float cy, float inr, float outr, |
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431 NVGcolor icol, NVGcolor ocol); |
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432 |
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433 // Creates and returns an image pattern. Parameters (ox,oy) specify the left-top location of the image pattern, |
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434 // (ex,ey) the size of one image, angle rotation around the top-left corner, image is handle to the image to render. |
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435 // The gradient is transformed by the current transform when it is passed to nvgFillPaint() or nvgStrokePaint(). |
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436 NVGpaint nvgImagePattern(NVGcontext* ctx, float ox, float oy, float ex, float ey, |
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437 float angle, int image, float alpha); |
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438 |
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439 // |
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440 // Scissoring |
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441 // |
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442 // Scissoring allows you to clip the rendering into a rectangle. This is useful for various |
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443 // user interface cases like rendering a text edit or a timeline. |
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444 |
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445 // Sets the current scissor rectangle. |
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446 // The scissor rectangle is transformed by the current transform. |
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447 void nvgScissor(NVGcontext* ctx, float x, float y, float w, float h); |
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448 |
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449 // Intersects current scissor rectangle with the specified rectangle. |
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450 // The scissor rectangle is transformed by the current transform. |
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451 // Note: in case the rotation of previous scissor rect differs from |
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452 // the current one, the intersection will be done between the specified |
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453 // rectangle and the previous scissor rectangle transformed in the current |
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454 // transform space. The resulting shape is always rectangle. |
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455 void nvgIntersectScissor(NVGcontext* ctx, float x, float y, float w, float h); |
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456 |
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457 // Reset and disables scissoring. |
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458 void nvgResetScissor(NVGcontext* ctx); |
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459 |
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460 // |
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461 // Paths |
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462 // |
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463 // Drawing a new shape starts with nvgBeginPath(), it clears all the currently defined paths. |
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464 // Then you define one or more paths and sub-paths which describe the shape. The are functions |
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465 // to draw common shapes like rectangles and circles, and lower level step-by-step functions, |
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466 // which allow to define a path curve by curve. |
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467 // |
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468 // NanoVG uses even-odd fill rule to draw the shapes. Solid shapes should have counter clockwise |
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469 // winding and holes should have counter clockwise order. To specify winding of a path you can |
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470 // call nvgPathWinding(). This is useful especially for the common shapes, which are drawn CCW. |
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471 // |
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472 // Finally you can fill the path using current fill style by calling nvgFill(), and stroke it |
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473 // with current stroke style by calling nvgStroke(). |
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474 // |
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475 // The curve segments and sub-paths are transformed by the current transform. |
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476 |
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477 // Clears the current path and sub-paths. |
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478 void nvgBeginPath(NVGcontext* ctx); |
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479 |
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480 // Starts new sub-path with specified point as first point. |
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481 void nvgMoveTo(NVGcontext* ctx, float x, float y); |
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482 |
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483 // Adds line segment from the last point in the path to the specified point. |
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484 void nvgLineTo(NVGcontext* ctx, float x, float y); |
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485 |
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486 // Adds cubic bezier segment from last point in the path via two control points to the specified point. |
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487 void nvgBezierTo(NVGcontext* ctx, float c1x, float c1y, float c2x, float c2y, float x, float y); |
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488 |
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489 // Adds quadratic bezier segment from last point in the path via a control point to the specified point. |
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490 void nvgQuadTo(NVGcontext* ctx, float cx, float cy, float x, float y); |
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491 |
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492 // Adds an arc segment at the corner defined by the last path point, and two specified points. |
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493 void nvgArcTo(NVGcontext* ctx, float x1, float y1, float x2, float y2, float radius); |
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494 |
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495 // Closes current sub-path with a line segment. |
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496 void nvgClosePath(NVGcontext* ctx); |
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497 |
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498 // Sets the current sub-path winding, see NVGwinding and NVGsolidity. |
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499 void nvgPathWinding(NVGcontext* ctx, int dir); |
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500 |
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501 // Creates new circle arc shaped sub-path. The arc center is at cx,cy, the arc radius is r, |
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502 // and the arc is drawn from angle a0 to a1, and swept in direction dir (NVG_CCW, or NVG_CW). |
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503 // Angles are specified in radians. |
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504 void nvgArc(NVGcontext* ctx, float cx, float cy, float r, float a0, float a1, int dir); |
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505 |
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506 // Creates new rectangle shaped sub-path. |
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507 void nvgRect(NVGcontext* ctx, float x, float y, float w, float h); |
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508 |
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509 // Creates new rounded rectangle shaped sub-path. |
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510 void nvgRoundedRect(NVGcontext* ctx, float x, float y, float w, float h, float r); |
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511 |
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512 // Creates new rounded rectangle shaped sub-path with varying radii for each corner. |
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513 void nvgRoundedRectVarying(NVGcontext* ctx, float x, float y, float w, float h, float radTopLeft, float radTopRight, float radBottomRight, float radBottomLeft); |
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514 |
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515 // Creates new ellipse shaped sub-path. |
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516 void nvgEllipse(NVGcontext* ctx, float cx, float cy, float rx, float ry); |
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517 |
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518 // Creates new circle shaped sub-path. |
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519 void nvgCircle(NVGcontext* ctx, float cx, float cy, float r); |
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520 |
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521 // Fills the current path with current fill style. |
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522 void nvgFill(NVGcontext* ctx); |
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523 |
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524 // Fills the current path with current stroke style. |
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525 void nvgStroke(NVGcontext* ctx); |
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526 |
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527 |
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528 // |
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529 // Text |
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530 // |
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531 // NanoVG allows you to load .ttf files and use the font to render text. |
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532 // |
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533 // The appearance of the text can be defined by setting the current text style |
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534 // and by specifying the fill color. Common text and font settings such as |
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535 // font size, letter spacing and text align are supported. Font blur allows you |
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536 // to create simple text effects such as drop shadows. |
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537 // |
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538 // At render time the font face can be set based on the font handles or name. |
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539 // |
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540 // Font measure functions return values in local space, the calculations are |
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541 // carried in the same resolution as the final rendering. This is done because |
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542 // the text glyph positions are snapped to the nearest pixels sharp rendering. |
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543 // |
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544 // The local space means that values are not rotated or scale as per the current |
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545 // transformation. For example if you set font size to 12, which would mean that |
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546 // line height is 16, then regardless of the current scaling and rotation, the |
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547 // returned line height is always 16. Some measures may vary because of the scaling |
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548 // since aforementioned pixel snapping. |
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549 // |
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550 // While this may sound a little odd, the setup allows you to always render the |
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551 // same way regardless of scaling. I.e. following works regardless of scaling: |
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552 // |
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553 // const char* txt = "Text me up."; |
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554 // nvgTextBounds(vg, x,y, txt, NULL, bounds); |
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555 // nvgBeginPath(vg); |
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556 // nvgRoundedRect(vg, bounds[0],bounds[1], bounds[2]-bounds[0], bounds[3]-bounds[1]); |
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557 // nvgFill(vg); |
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558 // |
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559 // Note: currently only solid color fill is supported for text. |
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560 |
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561 // Creates font by loading it from the disk from specified file name. |
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562 // Returns handle to the font. |
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563 int nvgCreateFont(NVGcontext* ctx, const char* name, const char* filename); |
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564 |
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565 // fontIndex specifies which font face to load from a .ttf/.ttc file. |
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566 int nvgCreateFontAtIndex(NVGcontext* ctx, const char* name, const char* filename, const int fontIndex); |
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567 |
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568 // Creates font by loading it from the specified memory chunk. |
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569 // Returns handle to the font. |
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570 int nvgCreateFontMem(NVGcontext* ctx, const char* name, unsigned char* data, int ndata, int freeData); |
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571 |
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572 // fontIndex specifies which font face to load from a .ttf/.ttc file. |
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573 int nvgCreateFontMemAtIndex(NVGcontext* ctx, const char* name, unsigned char* data, int ndata, int freeData, const int fontIndex); |
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574 |
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575 // Finds a loaded font of specified name, and returns handle to it, or -1 if the font is not found. |
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576 int nvgFindFont(NVGcontext* ctx, const char* name); |
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577 |
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578 // Adds a fallback font by handle. |
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579 int nvgAddFallbackFontId(NVGcontext* ctx, int baseFont, int fallbackFont); |
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580 |
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581 // Adds a fallback font by name. |
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582 int nvgAddFallbackFont(NVGcontext* ctx, const char* baseFont, const char* fallbackFont); |
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583 |
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584 // Resets fallback fonts by handle. |
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585 void nvgResetFallbackFontsId(NVGcontext* ctx, int baseFont); |
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586 |
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587 // Resets fallback fonts by name. |
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588 void nvgResetFallbackFonts(NVGcontext* ctx, const char* baseFont); |
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589 |
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590 // Sets the font size of current text style. |
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591 void nvgFontSize(NVGcontext* ctx, float size); |
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592 |
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593 // Sets the blur of current text style. |
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594 void nvgFontBlur(NVGcontext* ctx, float blur); |
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595 |
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596 // Sets the letter spacing of current text style. |
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597 void nvgTextLetterSpacing(NVGcontext* ctx, float spacing); |
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598 |
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599 // Sets the proportional line height of current text style. The line height is specified as multiple of font size. |
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600 void nvgTextLineHeight(NVGcontext* ctx, float lineHeight); |
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601 |
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602 // Sets the text align of current text style, see NVGalign for options. |
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603 void nvgTextAlign(NVGcontext* ctx, int align); |
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604 |
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605 // Sets the font face based on specified id of current text style. |
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606 void nvgFontFaceId(NVGcontext* ctx, int font); |
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607 |
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608 // Sets the font face based on specified name of current text style. |
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609 void nvgFontFace(NVGcontext* ctx, const char* font); |
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610 |
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611 // Draws text string at specified location. If end is specified only the sub-string up to the end is drawn. |
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612 float nvgText(NVGcontext* ctx, float x, float y, const char* string, const char* end); |
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613 |
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614 // Draws multi-line text string at specified location wrapped at the specified width. If end is specified only the sub-string up to the end is drawn. |
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615 // White space is stripped at the beginning of the rows, the text is split at word boundaries or when new-line characters are encountered. |
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616 // Words longer than the max width are slit at nearest character (i.e. no hyphenation). |
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617 void nvgTextBox(NVGcontext* ctx, float x, float y, float breakRowWidth, const char* string, const char* end); |
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618 |
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619 // Measures the specified text string. Parameter bounds should be a pointer to float[4], |
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620 // if the bounding box of the text should be returned. The bounds value are [xmin,ymin, xmax,ymax] |
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621 // Returns the horizontal advance of the measured text (i.e. where the next character should drawn). |
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622 // Measured values are returned in local coordinate space. |
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623 float nvgTextBounds(NVGcontext* ctx, float x, float y, const char* string, const char* end, float* bounds); |
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624 |
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625 // Measures the specified multi-text string. Parameter bounds should be a pointer to float[4], |
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626 // if the bounding box of the text should be returned. The bounds value are [xmin,ymin, xmax,ymax] |
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627 // Measured values are returned in local coordinate space. |
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628 void nvgTextBoxBounds(NVGcontext* ctx, float x, float y, float breakRowWidth, const char* string, const char* end, float* bounds); |
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629 |
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630 // Calculates the glyph x positions of the specified text. If end is specified only the sub-string will be used. |
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631 // Measured values are returned in local coordinate space. |
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632 int nvgTextGlyphPositions(NVGcontext* ctx, float x, float y, const char* string, const char* end, NVGglyphPosition* positions, int maxPositions); |
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633 |
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634 // Returns the vertical metrics based on the current text style. |
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635 // Measured values are returned in local coordinate space. |
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636 void nvgTextMetrics(NVGcontext* ctx, float* ascender, float* descender, float* lineh); |
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637 |
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638 // Breaks the specified text into lines. If end is specified only the sub-string will be used. |
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639 // White space is stripped at the beginning of the rows, the text is split at word boundaries or when new-line characters are encountered. |
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640 // Words longer than the max width are slit at nearest character (i.e. no hyphenation). |
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641 int nvgTextBreakLines(NVGcontext* ctx, const char* string, const char* end, float breakRowWidth, NVGtextRow* rows, int maxRows); |
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642 |
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643 // |
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644 // Internal Render API |
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645 // |
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646 struct NVGscissor { |
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647 float xform[6]; |
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648 float extent[2]; |
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649 }; |
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650 typedef struct NVGscissor NVGscissor; |
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651 |
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652 struct NVGvertex { |
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653 float x,y,u,v; |
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654 }; |
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655 typedef struct NVGvertex NVGvertex; |
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656 |
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657 struct NVGpath { |
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658 int first; |
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659 int count; |
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660 unsigned char closed; |
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661 int nbevel; |
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662 NVGvertex* fill; |
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663 int nfill; |
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664 NVGvertex* stroke; |
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665 int nstroke; |
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666 int winding; |
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667 int convex; |
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668 }; |
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669 typedef struct NVGpath NVGpath; |
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670 |
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671 struct NVGparams { |
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672 void* userPtr; |
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673 int edgeAntiAlias; |
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674 int (*renderCreate)(void* uptr, void* otherUptr); |
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675 int (*renderCreateTexture)(void* uptr, int type, int w, int h, int imageFlags, const unsigned char* data); |
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676 int (*renderDeleteTexture)(void* uptr, int image); |
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677 int (*renderUpdateTexture)(void* uptr, int image, int x, int y, int w, int h, const unsigned char* data); |
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678 int (*renderGetTextureSize)(void* uptr, int image, int* w, int* h); |
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679 void (*renderViewport)(void* uptr, float width, float height, float devicePixelRatio); |
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680 void (*renderCancel)(void* uptr); |
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681 void (*renderFlush)(void* uptr); |
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682 void (*renderFill)(void* uptr, NVGpaint* paint, NVGcompositeOperationState compositeOperation, NVGscissor* scissor, float fringe, const float* bounds, const NVGpath* paths, int npaths); |
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683 void (*renderStroke)(void* uptr, NVGpaint* paint, NVGcompositeOperationState compositeOperation, NVGscissor* scissor, float fringe, float strokeWidth, const NVGpath* paths, int npaths); |
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684 void (*renderTriangles)(void* uptr, NVGpaint* paint, NVGcompositeOperationState compositeOperation, NVGscissor* scissor, const NVGvertex* verts, int nverts, float fringe); |
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685 void (*renderDelete)(void* uptr); |
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686 }; |
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687 typedef struct NVGparams NVGparams; |
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688 |
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689 // Constructor and destructor, called by the render back-end. |
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690 NVGcontext* nvgCreateInternal(NVGparams* params, NVGcontext* other); |
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691 void nvgDeleteInternal(NVGcontext* ctx); |
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692 |
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693 NVGparams* nvgInternalParams(NVGcontext* ctx); |
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694 |
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695 // Debug function to dump cached path data. |
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696 void nvgDebugDumpPathCache(NVGcontext* ctx); |
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697 |
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698 #ifdef _MSC_VER |
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699 #pragma warning(pop) |
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700 #endif |
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701 |
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702 #define NVG_NOTUSED(v) for (;;) { (void)(1 ? (void)0 : ( (void)(v) ) ); break; } |
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703 |
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704 #ifdef __cplusplus |
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705 } |
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706 #endif |
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707 |
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708 #endif // NANOVG_H |