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105 lines
3.0 KiB
Objective-C
105 lines
3.0 KiB
Objective-C
#import "TGJpegTurbo.h"
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/*#import "Endian.h"
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#include "jpeglib.h"
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#include <setjmp.h>
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#import <ImageIO/ImageIO.h>
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struct TGJpegErrorManager
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{
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struct jpeg_error_mgr pub;
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jmp_buf setjmp_buffer;
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};
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typedef struct TGJpegErrorManager * TGJpegErrorManagerRef;
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static void TGJpegErrorExit(j_common_ptr cinfo)
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{
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TGJpegErrorManagerRef myerr = (TGJpegErrorManagerRef)cinfo->err;
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(*cinfo->err->output_message) (cinfo);
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longjmp(myerr->setjmp_buffer, 1);
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}
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UIImage *TGJpegTurboDecode(NSData *data)
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{
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struct jpeg_decompress_struct cinfo;
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struct TGJpegErrorManager errorManager;
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JSAMPARRAY buffer;
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int row_stride;
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cinfo.err = jpeg_std_error(&errorManager.pub);
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errorManager.pub.error_exit = TGJpegErrorExit;
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if (setjmp(errorManager.setjmp_buffer))
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{
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jpeg_destroy_decompress(&cinfo);
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return nil;
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}
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jpeg_create_decompress(&cinfo);
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jpeg_mem_src(&cinfo, (unsigned char *)data.bytes, data.length);
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jpeg_read_header(&cinfo, true);
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cinfo.dct_method = JDCT_IFAST;
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cinfo.do_fancy_upsampling = false;
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cinfo.two_pass_quantize = false;
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cinfo.do_block_smoothing = false;
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cinfo.dither_mode = JDITHER_NONE;
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if (false)
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{
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if (cinfo.image_width > 2000 || cinfo.image_height > 2000)
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{
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cinfo.scale_num = 2;
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cinfo.scale_denom = 8;
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}
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}
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cinfo.out_color_space = JCS_EXT_RGBA;
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jpeg_start_decompress(&cinfo);
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row_stride = cinfo.output_width * cinfo.output_components;
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int resultWidth = cinfo.output_width;
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int resultHeight = cinfo.output_height;
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int outputStride = resultWidth * 4;
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//NSLog(@"output: %dx%d (row stride %d)", cinfo.output_width, cinfo.output_height, row_stride);
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buffer = (*cinfo.mem->alloc_sarray)((j_common_ptr) &cinfo, JPOOL_IMAGE, row_stride, 1);
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uint8_t *rgba = (uint8_t *)malloc(cinfo.output_width * cinfo.output_height * 4);
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JSAMPLE *rowptr = (JSAMPLE *)rgba;
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CFAbsoluteTime decompressStart = CFAbsoluteTimeGetCurrent();
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while (cinfo.output_scanline < cinfo.output_height)
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{
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int rowCount = jpeg_read_scanlines(&cinfo, &rowptr, 1);
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rowptr += rowCount * row_stride;
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}
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//NSLog(@"Decompress time: %d ms", (int)((CFAbsoluteTimeGetCurrent() - decompressStart) * 1000));
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decompressStart = CFAbsoluteTimeGetCurrent();
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CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
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CGContextRef bitmapContext = CGBitmapContextCreate(rgba, resultWidth, resultHeight, 8, outputStride, colorSpace, kCGImageAlphaPremultipliedLast);
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CFRelease(colorSpace);
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CGImageRef cgImage = CGBitmapContextCreateImage(bitmapContext);
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CGContextRelease(bitmapContext);
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free(rgba);
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__autoreleasing UIImage *resultImage = [[UIImage alloc] initWithCGImage:cgImage];
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CGImageRelease(cgImage);
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jpeg_finish_decompress(&cinfo);
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jpeg_destroy_decompress(&cinfo);
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//NSLog(@"Parse time: %d ms", (int)((CFAbsoluteTimeGetCurrent() - decompressStart) * 1000));
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return resultImage;
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}
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*/ |