/**
* This deals with a bug/peculiarity for the default Mac font: several pixels of the ascent are
* actually empty. This screws up certain measurements which assume the font is actually a few
* pixels taller than it really is.
*/
private static int getUnusedAscent(FontMetrics fm, Font font) {
Integer value = ascentTable.get(font);
if (value == null) {
int recordedAscent = fm.getAscent();
FontRenderContext frc = new FontRenderContext(new AffineTransform(), false, false);
GlyphVector gv = font.createGlyphVector(frc, "XYZ");
Rectangle2D bounds = ShapeBounds.getBounds(gv.getOutline());
int observedAscent = (int) (Math.ceil(bounds.getHeight()) + .5);
value = new Integer(recordedAscent - observedAscent);
ascentTable.put(font, value);
}
return value.intValue();
}
private static BufferedImage createImage(String s, boolean valid) {
FontRenderContext frc = new FontRenderContext(null, true, true);
Font font = new Font("dialog", Font.BOLD, 12);
GlyphVector glyphs = font.createGlyphVector(frc, s);
Shape shape = glyphs.getOutline();
Rectangle bounds = shape.getBounds();
int imageW = bounds.width;
int imageH = bounds.height;
BufferedImage image = new BufferedImage(imageW, imageH, BufferedImage.TYPE_INT_ARGB);
Graphics2D g = (Graphics2D) image.getGraphics();
g.setColor(valid ? Color.blue : Color.red);
g.translate(bounds.x, -bounds.y);
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
g.fill(shape);
return image;
}