gistfile1.m

- (void)drawRect:(CGRect)rect {
	CGContextRef ctx = UIGraphicsGetCurrentContext();
	
//	CGFontRef font = CGFontCreateWithFontName((CFStringRef)[[self font] fontName]);
	CGFontRef font = CGFontCreateWithFontName((CFStringRef)@"HiraKakuProN-W3");
//	CGFontRef font = CGFontCreateWithFontName((CFStringRef)@"Helvetica");
	CGContextSetFont(ctx, font);
	CGContextSetFontSize(ctx, 14);
	
	// Transform text characters to unicode glyphs.
	
	CFAbsoluteTime t1 = CFAbsoluteTimeGetCurrent();
	
	NSInteger length = [[self text] length];
	unichar chars[100];
	CGGlyph glyphs[100];
	[[self text] getCharacters:chars range:NSMakeRange(0, length)];
	CGFontGetGlyphsForUnichars(font, chars, glyphs, length);

	NSLog(@"%d,%d,%d", glyphs[0], glyphs[1], glyphs[2]);
	
	CGContextSetTextDrawingMode(ctx, kCGTextInvisible); 
	
	// Measure text dimensions.
	CFAbsoluteTime t2 = CFAbsoluteTimeGetCurrent();
	
	
	CGPoint textEnd;
	for (int i = 0; i < 100; i++) {
		CGContextSetTextPosition(ctx, 0, 0);
		CGContextShowGlyphs(ctx, glyphs, length);
		textEnd = CGContextGetTextPosition(ctx);
	}
	

	CFAbsoluteTime t3 = CFAbsoluteTimeGetCurrent();
	
	for (int i = 0; i < 100; i++) {
		CGPoint pos = CGContextGetTextPosition(ctx);
		for (int t = 0; t < length; t++) {
			CGContextShowGlyphsAtPoint(ctx, pos.x, 0, &glyphs[t], 1);
			pos = CGContextGetTextPosition(ctx);
		}
	}
	
	CFAbsoluteTime t4 = CFAbsoluteTimeGetCurrent();
	
	
	
	CGContextSetTextMatrix(ctx, CGAffineTransformMakeScale(1, -1));
	
	
//	CGContextSaveGState(ctx);
	CGContextSetTextDrawingMode(ctx, kCGTextFill);
	CGContextSetFillColorWithColor(ctx, [[self shadowColor] CGColor]);
//	CGContextSetShadowWithColor(ctx, [self shadowOffset], 0, [[self shadowColor] CGColor]);
	CGContextShowGlyphsAtPoint(ctx, 0, 100, glyphs, length);
//	CGContextRestoreGState(ctx);
	
	CGPoint pos = {0,0};
	for (int i = 0; i < length; i++) {
		CGContextShowGlyphsAtPoint(ctx, pos.x, 120, &glyphs[i], 1);
		pos = CGContextGetTextPosition(ctx);
	}
	

	CFAbsoluteTime t5 = CFAbsoluteTimeGetCurrent();

	NSLog(@"toglyph:%3.4fms measure1:%3.4fms measure2:%3.4fms draw:%3.4fms", (t2-t1)*1000.0, (t3-t2)*1000.0, (t4-t3)*1000.0, (t5-t4)*1000.0);
	[self performSelector:@selector(setNeedsDisplay) withObject:nil afterDelay:1.2];

	CFRelease(font);
}