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taisukef/pdf2png.m

Forked from typester/pdf2png.m
Last active Sep 12, 2020
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/* * complie
gcc --std=c99 -Wall -g -o pdf2png pdf2png.m -framework Cocoa
*/
#import <Cocoa/Cocoa.h>
static NSString* dumpPNG(CGPDFPageRef page, NSURL* outDir) {
size_t num = CGPDFPageGetPageNumber(page);
assert(num > 0);
CGRect r = CGPDFPageGetBoxRect(page, kCGPDFTrimBox);
// 解像度を72*4, 288dpiに設定
size_t dpi = 72 * 4;
size_t scale = dpi / 72;
size_t w = r.size.width * scale;
size_t h = r.size.height * scale;
CGColorSpaceRef colorspace = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
CGContextRef ctx = CGBitmapContextCreate(
NULL, // 10.6+
w, h,
8, w * 4,
colorspace,
kCGImageAlphaNoneSkipFirst
);
// CGColorSpaceRelease(colorspace);
CGAffineTransform trans = CGAffineTransformMakeScale(scale, scale);
CGContextConcatCTM(ctx, trans);
//カラー作成
CGFloat col[4];
col[0] = 1.0;
col[1] = 1.0;
col[2] = 1.0;
col[3] = 1.0;
CGColorRef color = CGColorCreate(colorspace, col);
//色空間の解放
CGColorSpaceRelease(colorspace);
CGContextSetFillColorWithColor(ctx, color);
CGContextAddRect(ctx, CGRectMake(0.0, 0.0, w, h));
CGContextFillPath(ctx);
CGContextDrawPDFPage(ctx, page);
CGImageRef img = CGBitmapContextCreateImage(ctx);
assert(NULL != img);
NSBitmapImageRep* rep = [[NSBitmapImageRep alloc] initWithCGImage:img];
NSData* data = [rep representationUsingType:NSBitmapImageFileTypePNG properties:[NSDictionary dictionary]];
[rep release];
NSString* outFile = [[outDir path] stringByAppendingPathComponent:[NSString stringWithFormat:@"%04zu.png", num]];
BOOL success = [data writeToFile:outFile atomically:NO];
assert(YES == success);
CGImageRelease(img);
CGContextRelease(ctx);
return outFile;
}
int main(int argc, char** argv) {
NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
if (argc < 3) {
NSLog(@"Usage: %s input.pdf output_dir\n", argv[0]);
goto exit;
}
NSURL* inputFile = [NSURL fileURLWithPath:[NSString stringWithUTF8String:argv[1]]];
NSURL* outputDir = [NSURL fileURLWithPath:[NSString stringWithUTF8String:argv[2]] isDirectory:YES];
CGPDFDocumentRef pdf = CGPDFDocumentCreateWithURL((CFURLRef)inputFile);
assert(NULL != pdf);
size_t pages = CGPDFDocumentGetNumberOfPages(pdf);
size_t p;
for (p = 1; p <= pages; ++p) {
NSAutoreleasePool* poolin = [[NSAutoreleasePool alloc] init];
CGPDFPageRef page = CGPDFDocumentGetPage(pdf, p);
assert(NULL != page);
NSString* wrotePath = dumpPNG(page, outputDir);
NSLog(@"wrote: %@", wrotePath);
[poolin drain];
}
CGPDFDocumentRelease(pdf);
exit:
[pool drain];
return 0;
}
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