highrowglyph.m

//
//  main.m
//  HighRowGlyph
//
//  Created by Minh Nguyen on 2018-02-01.
//  Copyright © 2018 Mapbox. All rights reserved.
//

#import <Foundation/Foundation.h>
#import <Cocoa/Cocoa.h>
#import <CoreText/CoreText.h>
#import <CoreGraphics/CoreGraphics.h>

#define PTR_OR_ARRAY(name) (name##Ptr ?: name)

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        // Glyph IDs & positions
        NSString *str = @"Hello good World 汉语 漢語 เลขฮินดูอารบิก";
        NSDictionary *fontAttributes = @{
            (NSString *)kCTFontSizeAttribute: @24.0,
//            (NSString *)kCTFontFamilyNameAttribute: @"Comic Sans MS",
        };
        
        CTFontDescriptorRef descriptor = CTFontDescriptorCreateWithAttributes((CFDictionaryRef)fontAttributes);
        CTFontRef font = CTFontCreateWithFontDescriptor(descriptor, 0.0, NULL);
        
        UniChar chars[str.length];
        [str getCharacters:chars];
        CGGlyph glyphs[str.length];
        bool result = CTFontGetGlyphsForCharacters(font, chars, glyphs, str.length);
//        if (!result) {
//            return 1;
//        }
        for (NSUInteger i = 0; i < sizeof(glyphs) / sizeof(glyphs[0]); i++) {
            NSLog(@"%hu", glyphs[i]);
        }
        
        NSRect rect = NSMakeRect(0, 0, 300, 300);
        NSBitmapImageRep *rep = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes:NULL
                                                                                 pixelsWide:rect.size.width
                                                                                 pixelsHigh:rect.size.height
                                                                              bitsPerSample:8
                                                                            samplesPerPixel:4
                                                                                   hasAlpha:YES
                                                                                   isPlanar:NO
                                                                             colorSpaceName:NSDeviceRGBColorSpace
                                                                               bitmapFormat:NSAlphaFirstBitmapFormat
                                                                                bytesPerRow:0
                                                                               bitsPerPixel:0];
        NSGraphicsContext *context = [NSGraphicsContext graphicsContextWithBitmapImageRep:rep];
        
        CFAttributedStringRef attrStr = CFAttributedStringCreate(NULL, (CFStringRef)str, (CFDictionaryRef)fontAttributes);
        CTLineRef line = CTLineCreateWithAttributedString(attrStr);
        CFArrayRef runs = CTLineGetGlyphRuns(line);
        NSArray *colors = @[NSColor.blackColor, NSColor.brownColor, NSColor.purpleColor, NSColor.redColor, NSColor.orangeColor, NSColor.yellowColor];
        for (NSUInteger i = 0; i < CFArrayGetCount(runs); i++) {
            CTRunRef run = CFArrayGetValueAtIndex(runs, i);
            CGContextSetFillColorWithColor(context.CGContext, [colors[i] CGColor]);
            NSLog(@"Run %lu ---", (unsigned long)i);
            NSDictionary *attrs = (NSDictionary *)CTRunGetAttributes(run);
            NSLog(@"%@", [attrs[NSFontAttributeName] fontName]);
            CFIndex runGlyphCount = CTRunGetGlyphCount(run);
            const CGGlyph *runGlyphsPtr = CTRunGetGlyphsPtr(run);
            CGGlyph *runGlyphs = NULL;
            if (!runGlyphsPtr) {
                runGlyphs = malloc(runGlyphCount * sizeof(CGGlyph));
                CTRunGetGlyphs(run, CFRangeMake(0, 0), runGlyphs);
            }
            for (NSUInteger j = 0; j < runGlyphCount; j++) {
                NSLog(@"%hu", PTR_OR_ARRAY(runGlyphs)[j]);
            }
            
            CGRect runBounds = CTRunGetImageBounds(run, context.CGContext, CFRangeMake(0, 0));
            
            const CGPoint *positionsPtr = CTRunGetPositionsPtr(run);
            CGPoint *positions = NULL;
            if (!positionsPtr) {
                positions = malloc(runGlyphCount * sizeof(CGGlyph));
                CTRunGetPositions(run, CFRangeMake(0, 0), positions);
            }
            CTFontRef runFont = CTFontCreateWithName((CFStringRef)[attrs[NSFontAttributeName] fontName], [attrs[NSFontSizeAttribute] doubleValue] / 2.0, NULL);
            CTFontDrawGlyphs(runFont, PTR_OR_ARRAY(runGlyphs), PTR_OR_ARRAY(positions), runGlyphCount, context.CGContext);
            
            CGRect boundingRects[runGlyphCount];
            CTFontGetBoundingRectsForGlyphs(runFont, kCTFontOrientationHorizontal, PTR_OR_ARRAY(runGlyphs), boundingRects, runGlyphCount);
            CGSize advances[runGlyphCount];
            CTFontGetAdvancesForGlyphs(runFont, kCTFontOrientationHorizontal, PTR_OR_ARRAY(runGlyphs), advances, runGlyphCount);
            CGSize translations[runGlyphCount];
            CTFontGetVerticalTranslationsForGlyphs(font, PTR_OR_ARRAY(runGlyphs), translations, runGlyphCount);
            CGSize runAdvance = CGSizeZero;
            for (NSUInteger j = 0; j < runGlyphCount; j++) {
                CGRect frame = boundingRects[j];
//                frame.origin.x = CGRectGetMinX(runBounds) + runAdvance.width;
//                frame.origin.y = CGRectGetMinY(runBounds) + runAdvance.height;
                frame.origin.x += CGRectGetMinX(runBounds) + runAdvance.width;
                frame.origin.y += /* CGRectGetMinY(runBounds) */ + runAdvance.height;
                CGContextStrokeRectWithWidth(context.CGContext, frame, 0.5);
                frame.origin.y += 20;
                CGContextStrokeRectWithWidth(context.CGContext, frame, 0.5);
                runAdvance.width += advances[j].width;
                runAdvance.height += advances[j].height;
            }
            
            free(runGlyphs);
            free(positions);
        }
        
        [NSGraphicsContext restoreGraphicsState];
        NSData *imageData = [rep representationUsingType:NSPNGFileType properties:@{}];
        NSURL *fileURL = [NSURL fileURLWithPath:@"/Users/mxn/Desktop/firstrun.png"];
        [imageData writeToURL:fileURL atomically:NO];
    }
    return 0;
}