gistfile1.txt

- (void)drawRect:(NSRect)dirtyRect {
    NSString *string = @"Hello world";
    NSDictionary *attributes = @{ (NSString *)kCTForegroundColorAttributeName: (id)[[NSColor blackColor] CGColor],
                                  NSFontAttributeName: [NSFont fontWithName:@"PragmataProMono-Regular" size:12],
                                  NSLigatureAttributeName: @0,
                                  NSUnderlineStyleAttributeName: @1 };
    NSAttributedString *attributedString = [[NSAttributedString alloc] initWithString:string
                                                                           attributes:attributes];
    CGColorRef cgColor = (__bridge CGColorRef)attributes[(NSString *)kCTForegroundColorAttributeName];

    NSGraphicsContext *ctx = [NSGraphicsContext currentContext];
    [ctx saveGraphicsState];
    [ctx setCompositingOperation:NSCompositingOperationSourceOver];

    // We used to use -[NSAttributedString drawWithRect:options] but
    // it does a lousy job rendering multiple combining marks. This is close
    // to what WebKit does and appears to be the highest quality text
    // rendering available.

    CTLineRef lineRef;
    lineRef = CTLineCreateWithAttributedString((CFAttributedStringRef)attributedString);

    CFArrayRef runs = CTLineGetGlyphRuns(lineRef);
    CGContextRef cgContext = [ctx CGContext];
    CGContextSetShouldAntialias(cgContext, NO);
    CGContextSetFillColorWithColor(cgContext, cgColor);
    CGContextSetStrokeColorWithColor(cgContext, cgColor);

    CGFloat c = 0.0;

    const CGFloat ty = 100;
    CGAffineTransform textMatrix = CGAffineTransformMake(1.0, 0.0,
                                                         c, 1.0,
                                                         100, ty);
    CGContextSetTextMatrix(cgContext, textMatrix);

    for (CFIndex j = 0; j < CFArrayGetCount(runs); j++) {
        CTRunRef run = CFArrayGetValueAtIndex(runs, j);
        size_t length = CTRunGetGlyphCount(run);
        const CGGlyph *buffer = CTRunGetGlyphsPtr(run);
        if (!buffer) {
            NSMutableData *tempBuffer =
            [[NSMutableData alloc] initWithLength:sizeof(CGGlyph) * length];
            CTRunGetGlyphs(run, CFRangeMake(0, length), (CGGlyph *)tempBuffer.mutableBytes);
            buffer = tempBuffer.mutableBytes;
        }

        NSMutableData *positionsBuffer =
        [[NSMutableData alloc] initWithLength:sizeof(CGPoint) * length];
        CTRunGetPositions(run, CFRangeMake(0, length), (CGPoint *)positionsBuffer.mutableBytes);
        CGPoint *positions = positionsBuffer.mutableBytes;

        const CFIndex *glyphIndexToCharacterIndex = CTRunGetStringIndicesPtr(run);
        if (!glyphIndexToCharacterIndex) {
            NSMutableData *tempBuffer =
            [[NSMutableData alloc] initWithLength:sizeof(CFIndex) * length];
            CTRunGetStringIndices(run, CFRangeMake(0, length), (CFIndex *)tempBuffer.mutableBytes);
            glyphIndexToCharacterIndex = (CFIndex *)tempBuffer.mutableBytes;
        }

        CTFontRef runFont = CFDictionaryGetValue(CTRunGetAttributes(run), kCTFontAttributeName);
        CTFontDrawGlyphs(runFont, buffer, (NSPoint *)positions, length, cgContext);
    }
}