add Atlas class

src/Atlas.cpp

@@ -0,0 +1,87 @@
+#include "Atlas.h"
+#include "BitmapRef.hpp"
+
+void ofxMsdfgen::Atlas::setup(string _fontPath){
+    fontPath = _fontPath;
+    if(generate()){
+        ofLogNotice("ofxMsdfgen::Atlas::setup()") << "generated Atlas";
+    }else{
+        ofLogError("ofxMsdfgen::Atlas::setup()") << "whoops, could not generate Atlas";
+    }
+}
+
+void ofxMsdfgen::Atlas::setup(string _fontPath,
+                              AtlasSettings _settings){
+    settings = _settings;
+    setup(_fontPath);
+}
+
+bool ofxMsdfgen::Atlas::generate(){
+    bool success = false;
+    // Initialize instance of FreeType library
+    if(msdfgen::FreetypeHandle * ft = msdfgen::initializeFreetype()){
+        // Load font file
+        if(msdfgen::FontHandle * font = msdfgen::loadFont(ft, fontPath.c_str())){
+            // Storage for glyph geometry and their coordinates in the atlas
+            std::vector <msdf_atlas::GlyphGeometry> glyphs;
+            // FontGeometry is a helper class that loads a set of glyphs from a single font.
+            // It can also be used to get additional font metrics, kerning information, etc.
+            msdf_atlas::FontGeometry fontGeometry(&glyphs);
+            // Load a set of character glyphs:
+            // The second argument can be ignored unless you mix different font sizes in one atlas.
+            // In the last argument, you can specify a charset other than ASCII.
+            // To load specific glyph indices, use loadGlyphs instead.
+            fontGeometry.loadCharset(font, 1.0, msdf_atlas::Charset::ASCII);
+            // Apply MSDF edge coloring. See edge-coloring.h for other coloring strategies.
+            for(msdf_atlas::GlyphGeometry & glyph : glyphs){
+                glyph.edgeColoring(&msdfgen::edgeColoringInkTrap,
+                                   settings.maxCornerAngle,
+                                   0);
+            }
+            // TightAtlasPacker class computes the layout of the atlas.
+            msdf_atlas::TightAtlasPacker packer;
+            // Set atlas parameters:
+            // setDimensions or setDimensionsConstraint to find the best value
+            packer.setDimensionsConstraint(msdf_atlas::TightAtlasPacker::DimensionsConstraint::SQUARE);
+            // setScale for a fixed size or setMinimumScale to use the largest that fits
+            packer.setMinimumScale(settings.minimumScale);
+            // setPixelRange or setUnitRange
+            packer.setPixelRange(settings.pixelRange);
+            packer.setMiterLimit(settings.miterLimit);
+            // Compute atlas layout - pack glyphs
+            packer.pack(glyphs.data(), glyphs.size());
+            // Get final atlas dimensions
+            int width = 0, height = 0;
+            packer.getDimensions(width, height);
+            // The ImmediateAtlasGenerator class facilitates the generation of the atlas bitmap.
+            msdf_atlas::ImmediateAtlasGenerator <
+                float, // pixel type of buffer for individual glyphs depends on generator function
+                3, // number of atlas color channels
+                & msdf_atlas::msdfGenerator, // function to generate bitmaps for individual glyphs
+                msdf_atlas::BitmapAtlasStorage <float, 3> // class that stores the atlas bitmap
+                // For example, a custom atlas storage class that stores it in VRAM can be used.
+                > generator(width, height);
+            // GeneratorAttributes can be modified to change the generator's default settings.
+            msdf_atlas::GeneratorAttributes attributes;
+            generator.setAttributes(attributes);
+            generator.setThreadCount(settings.threadCount);
+            // Generate atlas bitmap
+            generator.generate(glyphs.data(), glyphs.size());
+            // The atlas bitmap can now be retrieved via atlasStorage as a BitmapConstRef.
+            // The glyphs array (or fontGeometry) contains positioning data for typesetting text.
+            msdfgen::Bitmap <float, 3> bitmap(generator.atlasStorage());
+            ofxMsdfgen::toOfImage(bitmap, atlasImage);
+
+            // Cleanup
+            msdfgen::destroyFont(font);
+
+            success = true; // FIXME: always turns true, why do we have this
+        }
+        msdfgen::deinitializeFreetype(ft);
+    }
+    return success;
+}
+
+const ofImage & ofxMsdfgen::Atlas::getAtlasImage(){
+    return atlasImage;
+}

src/Atlas.h

@@ -0,0 +1,26 @@
+#pragma once
+
+#include "ofMain.h"
+#include <msdf-atlas-gen/msdf-atlas-gen.h>
+#include "conversion.h"
+
+namespace ofxMsdfgen {
+struct AtlasSettings {
+    float maxCornerAngle = 3.0;
+    float minimumScale = 24.0;
+    float pixelRange = 2.0;
+    float miterLimit = 1.0;
+    int threadCount = 4;
+};
+class Atlas {
+    public:
+        void setup(string _fontPath);
+        void setup(string _fontPath, AtlasSettings _settings);
+        bool generate();
+        const ofImage & getAtlasImage();
+        AtlasSettings settings;
+    private:
+        string fontPath;
+        ofImage atlasImage;
+};
+}

src/conversion.cpp

@@ -0,0 +1,60 @@
+#include "conversion.h"
+
+void ofxMsdfgen::toOfImage(msdfgen::Bitmap <float, 3> bitmap,
+                           ofFloatImage & image){
+    image.allocate(bitmap.width(), bitmap.height(), OF_IMAGE_COLOR);
+    memcpy(image.getPixels().getData(), static_cast <float *>(bitmap), bitmap.width() * bitmap.height() * 3 * sizeof(float));
+    image.update(); // float is slow here
+}
+
+void ofxMsdfgen::toOfImage(const msdfgen::Bitmap <float, 3> bitmap,
+                           ofImage & image){
+    image.allocate(bitmap.width(), bitmap.height(), OF_IMAGE_COLOR);
+    ofPixels & pixels = image.getPixels();
+    int w = bitmap.width();
+    int h = bitmap.height();
+    for(int y = 0; y < h; y++){
+        for(int x = 0; x < w; x++){
+            const float * rgb = bitmap(x, y);
+            int index = 3 * (x + y * w);
+            pixels.getData()[index] = (unsigned char)std::clamp(rgb[0] * 256.0,
+                                                                0.0, 255.0);
+            pixels.getData()[index + 1] = (unsigned char)std::clamp(rgb[1] * 256.0,
+                                                                    0.0, 255.0);
+            pixels.getData()[index + 2] = (unsigned char)std::clamp(rgb[2] * 256.0,
+                                                                    0.0, 255.0);
+        }
+    }
+
+    image.update();
+}
+
+void ofxMsdfgen::toOfImage(const msdfgen::Bitmap <byte, 3> bitmap,
+                           ofImage & image){
+    image.allocate(bitmap.width(), bitmap.height(), OF_IMAGE_COLOR);
+    memcpy(image.getPixels().getData(), bitmap.getPixels(), bitmap.width() * bitmap.height() * 3 * sizeof(byte));
+
+    image.update();
+}
+
+ofImage ofxMsdfgen::toOfImage(const msdfgen::Bitmap <float, 3> bitmap){
+    ofImage image;
+    image.allocate(bitmap.width(), bitmap.height(), OF_IMAGE_COLOR);
+    ofPixels & pixels = image.getPixels();
+    int w = bitmap.width();
+    int h = bitmap.height();
+    for(int y = 0; y < h; y++){
+        for(int x = 0; x < w; x++){
+            const float * rgb = bitmap(x, y);
+            int index = 3 * (x + y * w);
+            pixels.getData()[index] = (unsigned char)std::clamp(rgb[0] * 256.0,
+                                                                0.0, 255.0);
+            pixels.getData()[index + 1] = (unsigned char)std::clamp(rgb[1] * 256.0,
+                                                                    0.0, 255.0);
+            pixels.getData()[index + 2] = (unsigned char)std::clamp(rgb[2] * 256.0,
+                                                                    0.0, 255.0);
+        }
+    }
+    image.update();
+    return image;
+}

src/conversion.h

@@ -0,0 +1,16 @@
+#pragma once
+
+#include "ofMain.h"
+#include "BitmapAtlasStorage.h"
+#include "GlyphGeometry.h"
+#include <msdf-atlas-gen/msdf-atlas-gen.h>
+
+namespace ofxMsdfgen {
+void toOfImage(msdfgen::Bitmap <float, 3> bitmap,
+               ofFloatImage & image);
+void toOfImage(const msdfgen::Bitmap <float, 3> bitmap,
+               ofImage & image);
+void toOfImage(const msdfgen::Bitmap <byte, 3> bitmap,
+               ofImage & image);
+ofImage toOfImage(const msdfgen::Bitmap <float, 3>);
+}

src/ofxMsdfgen.cpp

@@ -1,31 +1,80 @@
 #include "ofxMsdfgen.h"
+#include "BitmapRef.hpp"
+#include "ofGraphicsConstants.h"
 #include "ofPixels.h"
 
-void ofxMsdfgen::toOfImage(const msdfgen::Bitmap <float, 3> bitmap,
+bool ofxMsdfgen::generateAtlas(const char * fontFilename){
-                           ofFloatImage & image){
+    bool success = false;
-    image.allocate(bitmap.width(), bitmap.height(), OF_IMAGE_COLOR);
+    // Initialize instance of FreeType library
-    memcpy(image.getPixels().getData(), bitmap.getPixels(), bitmap.width() * bitmap.height() * 3 * sizeof(float));
+    if(msdfgen::FreetypeHandle * ft = msdfgen::initializeFreetype()){
-    image.update(); // float is slow here
+        // Load font file
-}
+        if(msdfgen::FontHandle * font = msdfgen::loadFont(ft, fontFilename)){
-
+            // Storage for glyph geometry and their coordinates in the atlas
-void ofxMsdfgen::toOfImage(const msdfgen::Bitmap <float, 3> bitmap,
+            std::vector <msdf_atlas::GlyphGeometry> glyphs;
-                           ofImage & image){
+            // FontGeometry is a helper class that loads a set of glyphs from a single font.
-    image.allocate(bitmap.width(), bitmap.height(), OF_IMAGE_COLOR);
+            // It can also be used to get additional font metrics, kerning information, etc.
-    ofPixels & pixels = image.getPixels();
+            msdf_atlas::FontGeometry fontGeometry(&glyphs);
-    int w = bitmap.width();
+            // Load a set of character glyphs:
-    int h = bitmap.height();
+            // The second argument can be ignored unless you mix different font sizes in one atlas.
-    for(int y = 0; y < h; y++){
+            // In the last argument, you can specify a charset other than ASCII.
-        for(int x = 0; x < w; x++){
+            // To load specific glyph indices, use loadGlyphs instead.
-            const float * rgb = bitmap(x, y);
+            fontGeometry.loadCharset(font, 1.0, msdf_atlas::Charset::ASCII);
-            int index = 3 * (x + y * w);
+            // Apply MSDF edge coloring. See edge-coloring.h for other coloring strategies.
-            pixels.getData()[index] = (unsigned char)std::clamp(rgb[0] * 256.0,
+            const double maxCornerAngle = 3.0;
-                                                                0.0, 255.0);
+            for(msdf_atlas::GlyphGeometry & glyph : glyphs){
-            pixels.getData()[index + 1] = (unsigned char)std::clamp(rgb[1] * 256.0,
+                glyph.edgeColoring(&msdfgen::edgeColoringInkTrap, maxCornerAngle, 0);
-                                                                    0.0, 255.0);
+            }
-            pixels.getData()[index + 2] = (unsigned char)std::clamp(rgb[2] * 256.0,
+            // TightAtlasPacker class computes the layout of the atlas.
-                                                                    0.0, 255.0);
+            msdf_atlas::TightAtlasPacker packer;
+            // Set atlas parameters:
+            // setDimensions or setDimensionsConstraint to find the best value
+            packer.setDimensionsConstraint(msdf_atlas::TightAtlasPacker::DimensionsConstraint::SQUARE);
+            // setScale for a fixed size or setMinimumScale to use the largest that fits
+            packer.setMinimumScale(24.0);
+            // setPixelRange or setUnitRange
+            packer.setPixelRange(2.0);
+            packer.setMiterLimit(1.0);
+            // Compute atlas layout - pack glyphs
+            packer.pack(glyphs.data(), glyphs.size());
+            // Get final atlas dimensions
+            int width = 0, height = 0;
+            packer.getDimensions(width, height);
+            // The ImmediateAtlasGenerator class facilitates the generation of the atlas bitmap.
+            msdf_atlas::ImmediateAtlasGenerator <
+                float, // pixel type of buffer for individual glyphs depends on generator function
+                3, // number of atlas color channels
+                & msdf_atlas::msdfGenerator, // function to generate bitmaps for individual glyphs
+                msdf_atlas::BitmapAtlasStorage <float, 3> // class that stores the atlas bitmap
+                // For example, a custom atlas storage class that stores it in VRAM can be used.
+                > generator(width, height);
+            // GeneratorAttributes can be modified to change the generator's default settings.
+            msdf_atlas::GeneratorAttributes attributes;
+            generator.setAttributes(attributes);
+            generator.setThreadCount(12);
+            // Generate atlas bitmap
+            generator.generate(glyphs.data(), glyphs.size());
+            // The atlas bitmap can now be retrieved via atlasStorage as a BitmapConstRef.
+            // The glyphs array (or fontGeometry) contains positioning data for typesetting text.
+            success = submitAtlasBitmapAndLayout((msdfgen::BitmapConstRef <float, 3>)generator.atlasStorage(),
+                                                 glyphs,
+                                                 width,
+                                                 height);
+            // Cleanup
+            msdfgen::destroyFont(font);
         }
+        msdfgen::deinitializeFreetype(ft);
     }
-
+    return success;
-    image.update();
+}
+
+bool ofxMsdfgen::submitAtlasBitmapAndLayout(const msdfgen::BitmapConstRef <float, 3> & storage,
+                                            const std::vector <msdf_atlas::GlyphGeometry> & glyphs,
+                                            const int & width,
+                                            const int & height){
+    const msdfgen::Bitmap <float, 3> bitmap(storage);
+    ofImage image;
+    toOfImage(bitmap, image);
+    image.save("atlas.png");
+
+    return true;
 }

src/ofxMsdfgen.h

@@ -1,11 +1,19 @@
 #pragma once
 
+#include "BitmapAtlasStorage.h"
+#include "GlyphGeometry.h"
 #include "ofMain.h"
 #include <msdf-atlas-gen/msdf-atlas-gen.h>
+#include "Atlas.h"
+#include "conversion.h"
 
 namespace ofxMsdfgen {
-void toOfImage(const msdfgen::Bitmap <float, 3> bitmap,
+bool generateAtlas(const char * fontFilename);
-               ofFloatImage & image);
+
-void toOfImage(const msdfgen::Bitmap <float, 3> bitmap,
+// doesn't really do anything yet
-               ofImage & image);
+// just saves the atlas as a png
+bool submitAtlasBitmapAndLayout(const msdfgen::BitmapConstRef <float, 3> & storage,
+                                const std::vector <msdf_atlas::GlyphGeometry> & glyphs,
+                                const int & width,
+                                const int & height);
 }