85 lines
2.2 KiB
Objective-C
85 lines
2.2 KiB
Objective-C
//
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// CharacterImage.m
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// Copyright © 2018 Ben Zotto. All rights reserved.
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//
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#import "CharacterImage.h"
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@interface CharacterImage ()
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{
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uint8 * _image;
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}
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@property (assign) NSUInteger characterWidth;
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@property (assign) NSInteger characterOffset;
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@property (assign) UIntSize characterRectSize;
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@end
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@implementation CharacterImage
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+ (instancetype)imageWithWidth:(NSUInteger)width
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offset:(NSInteger)offset
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rectSize:(UIntSize)size // size of character rect in bits (image width x font height)
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fromBitmap:(uint8 *)bitmap // base pointer to image bitmap to copy from
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bitmapStartLocation:(NSUInteger)startLocation // bit location from the start where this image begins
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bitmapStride:(NSUInteger)stride // stride of bitmap pointer (in bytes)
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{
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CharacterImage * image = [[CharacterImage alloc] init];
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image.characterWidth = width;
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image.characterOffset = offset;
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image.characterRectSize = size;
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NSUInteger bitmapsize = size.width * size.height * sizeof(uint8);
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if (bitmapsize == 0) {
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return image;
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}
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image->_image = malloc(bitmapsize);
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if (!image->_image) {
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return nil;
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}
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for (NSUInteger y = 0; y < size.height; y++) {
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for (NSUInteger x = 0; x < size.width; x++) {
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NSUInteger loc = startLocation + x;
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uint8 byte = bitmap[(stride * y) + (loc / 8)];
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uint8 value = (byte >> (7 - (loc % 8))) & 0x01;
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image->_image[y * size.width + x] = value;
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}
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}
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return image;
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}
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- (void)dealloc
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{
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if (_image) {
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free(_image);
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}
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}
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- (uint8 *)image
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{
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return _image;
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}
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- (BOOL)isWhitespace
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{
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return self.characterRectSize.width == 0;
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}
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- (NSString *)imageAsDebugString
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{
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NSMutableString * str = [[NSMutableString alloc] init];
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for (int y = 0; y < self.characterRectSize.height; y++) {
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for (int x = 0; x < self.characterRectSize.width; x++) {
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int value = self.image[y * self.characterRectSize.width + x];
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if (value) {
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[str appendString:@"X"];
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} else {
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[str appendString:@"."];
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}
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}
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[str appendString:@"\n"];
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}
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return str;
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}
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@end
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