80 lines
4.3 KiB
C++
80 lines
4.3 KiB
C++
#include "ofxMsdfgen.h"
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#include "BitmapRef.hpp"
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#include "ofGraphicsConstants.h"
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#include "ofPixels.h"
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bool ofxMsdfgen::generateAtlas(const char * fontFilename){
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bool success = false;
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// Initialize instance of FreeType library
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if(msdfgen::FreetypeHandle * ft = msdfgen::initializeFreetype()){
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// Load font file
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if(msdfgen::FontHandle * font = msdfgen::loadFont(ft, fontFilename)){
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// Storage for glyph geometry and their coordinates in the atlas
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std::vector <msdf_atlas::GlyphGeometry> glyphs;
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// FontGeometry is a helper class that loads a set of glyphs from a single font.
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// It can also be used to get additional font metrics, kerning information, etc.
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msdf_atlas::FontGeometry fontGeometry(&glyphs);
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// Load a set of character glyphs:
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// The second argument can be ignored unless you mix different font sizes in one atlas.
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// In the last argument, you can specify a charset other than ASCII.
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// To load specific glyph indices, use loadGlyphs instead.
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fontGeometry.loadCharset(font, 1.0, msdf_atlas::Charset::ASCII);
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// Apply MSDF edge coloring. See edge-coloring.h for other coloring strategies.
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const double maxCornerAngle = 3.0;
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for(msdf_atlas::GlyphGeometry & glyph : glyphs){
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glyph.edgeColoring(&msdfgen::edgeColoringInkTrap, maxCornerAngle, 0);
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}
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// TightAtlasPacker class computes the layout of the atlas.
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msdf_atlas::TightAtlasPacker packer;
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// Set atlas parameters:
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// setDimensions or setDimensionsConstraint to find the best value
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packer.setDimensionsConstraint(msdf_atlas::TightAtlasPacker::DimensionsConstraint::SQUARE);
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// setScale for a fixed size or setMinimumScale to use the largest that fits
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packer.setMinimumScale(24.0);
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// setPixelRange or setUnitRange
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packer.setPixelRange(2.0);
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packer.setMiterLimit(1.0);
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// Compute atlas layout - pack glyphs
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packer.pack(glyphs.data(), glyphs.size());
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// Get final atlas dimensions
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int width = 0, height = 0;
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packer.getDimensions(width, height);
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// The ImmediateAtlasGenerator class facilitates the generation of the atlas bitmap.
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msdf_atlas::ImmediateAtlasGenerator <
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float, // pixel type of buffer for individual glyphs depends on generator function
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3, // number of atlas color channels
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& msdf_atlas::msdfGenerator, // function to generate bitmaps for individual glyphs
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msdf_atlas::BitmapAtlasStorage <float, 3> // class that stores the atlas bitmap
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// For example, a custom atlas storage class that stores it in VRAM can be used.
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> generator(width, height);
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// GeneratorAttributes can be modified to change the generator's default settings.
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msdf_atlas::GeneratorAttributes attributes;
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generator.setAttributes(attributes);
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generator.setThreadCount(12);
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// Generate atlas bitmap
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generator.generate(glyphs.data(), glyphs.size());
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// The atlas bitmap can now be retrieved via atlasStorage as a BitmapConstRef.
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// The glyphs array (or fontGeometry) contains positioning data for typesetting text.
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success = submitAtlasBitmapAndLayout((msdfgen::BitmapConstRef <float, 3>)generator.atlasStorage(),
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glyphs,
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width,
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height);
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// Cleanup
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msdfgen::destroyFont(font);
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}
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msdfgen::deinitializeFreetype(ft);
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}
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return success;
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}
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bool ofxMsdfgen::submitAtlasBitmapAndLayout(const msdfgen::BitmapConstRef <float, 3> & storage,
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const std::vector <msdf_atlas::GlyphGeometry> & glyphs,
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const int & width,
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const int & height){
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const msdfgen::Bitmap <float, 3> bitmap(storage);
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ofImage image;
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toOfImage(bitmap, image);
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image.save("atlas.png");
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return true;
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}
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