Test case for Cinder's gl::TextureFont

Application.cpp

#include "cinder/app/AppNative.h"
#include "cinder/gl/TextureFont.h"

using namespace ci;
using namespace ci::app;
using namespace std;

const string text = "This is a long sentence that should split over a few good lines, hopefully!";

class Application : public AppNative
{
public:
  Font font;
  gl::TextureFontRef textureFont;
    
  TextBox textBox;
  Rectf bounds;
  vector<pair<uint16_t,Vec2f>> glyphMeasures;
    
  gl::TextureFont::DrawOptions options;
    
  float scale;
  Vec2f corner;
    
  void setup();
  void draw();
};

void Application::setup()
{
  gl::TextureFont::Format format;
  format.textureWidth(512).textureHeight(512).enableMipmapping();
    
  font = Font("ArialMT", 32);
  textureFont = gl::TextureFont::create(font, format, gl::TextureFont::defaultChars());
    
  scale = 0.75f;
  corner = Vec2f(30, 50);
    
  /*
   * PROBLEM 1: THIS IS CREATING A DEFAULT-FONT WHICH ENDS-UP BEHING UNUSED
   */
  textBox = TextBox().font(font).text(text).size(320, TextBox::GROW);
    
  /*
   * PROBLEM 2, PART A: THIS IS INVOKING TextBox::createLines()
   */
  Vec2f size = textBox.measure() * scale;
  bounds = Rectf(0, 0, size.x, size.y);
   
  /*
   * PROBLEM 2, PART B: THIS IS (AGAIN) INVOKING TextBox::createLines()
   */
  glyphMeasures = textBox.measureGlyphs();
    
  options = gl::TextureFont::DrawOptions().scale(scale);
    
  // ---
    
  glEnable(GL_BLEND);
  glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  
  glDepthMask(GL_FALSE);
  glDisable(GL_DEPTH_TEST);
}

void Application::draw()
{
  gl::clear(Color(0.5f, 0.5f, 0.5f), false);
  gl::setMatricesWindow(getWindowSize());

  // ---
    
  gl::translate(corner);
  
  gl::color(Color(1.0f, 0.5f, 0.0f));
  gl::drawSolidRect(bounds);

  /*
  * PROBLEM 3: TEXT LOOKS DIRTY WHEN SCALE IS NOT 1.0
  */
  gl::color(Color::white());
  textureFont->drawGlyphs( glyphMeasures, Vec2f(0, textureFont->getAscent()) * scale, options);
}

CINDER_APP_NATIVE(Application, RendererGl(0))