287 lines
7.1 KiB
C++
287 lines
7.1 KiB
C++
// Copyright (C) 2002-2012 Nikolaus Gebhardt
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// This file is part of the "Irrlicht Engine".
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// For conditions of distribution and use, see copyright notice in irrlicht.h
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#include "CImageLoaderJPG.h"
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#include "IReadFile.h"
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#include "CImage.h"
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#include "os.h"
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#include "irrString.h"
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namespace irr
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{
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namespace video
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{
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//! constructor
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CImageLoaderJPG::CImageLoaderJPG()
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{
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#ifdef _DEBUG
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setDebugName("CImageLoaderJPG");
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#endif
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}
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//! destructor
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CImageLoaderJPG::~CImageLoaderJPG()
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{
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}
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//! returns true if the file maybe is able to be loaded by this class
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//! based on the file extension (e.g. ".tga")
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bool CImageLoaderJPG::isALoadableFileExtension(const io::path& filename) const
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{
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return core::hasFileExtension ( filename, "jpg", "jpeg" );
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}
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// struct for handling jpeg errors
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struct irr_jpeg_error_mgr
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{
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// public jpeg error fields
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struct jpeg_error_mgr pub;
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// for longjmp, to return to caller on a fatal error
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jmp_buf setjmp_buffer;
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// for having access to the filename when printing the error messages
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core::stringc* filename;
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};
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void CImageLoaderJPG::init_source (j_decompress_ptr cinfo)
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{
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// DO NOTHING
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}
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boolean CImageLoaderJPG::fill_input_buffer (j_decompress_ptr cinfo)
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{
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// DO NOTHING
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return TRUE;
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}
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void CImageLoaderJPG::skip_input_data (j_decompress_ptr cinfo, long count)
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{
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jpeg_source_mgr * src = cinfo->src;
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if(count > 0)
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{
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src->bytes_in_buffer -= count;
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src->next_input_byte += count;
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}
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}
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void CImageLoaderJPG::term_source (j_decompress_ptr cinfo)
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{
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// DO NOTHING
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}
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void CImageLoaderJPG::error_exit (j_common_ptr cinfo)
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{
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// unfortunately we need to use a goto rather than throwing an exception
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// as gcc crashes under linux crashes when using throw from within
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// extern c code
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// Always display the message
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(*cinfo->err->output_message) (cinfo);
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// cinfo->err really points to a irr_error_mgr struct
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irr_jpeg_error_mgr *myerr = (irr_jpeg_error_mgr*) cinfo->err;
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longjmp(myerr->setjmp_buffer, 1);
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}
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void CImageLoaderJPG::output_message(j_common_ptr cinfo)
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{
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// display the error message.
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c8 temp1[JMSG_LENGTH_MAX];
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(*cinfo->err->format_message)(cinfo, temp1);
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core::stringc errMsg("JPEG FATAL ERROR in ");
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irr_jpeg_error_mgr* myerr = (irr_jpeg_error_mgr*)cinfo->err;
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errMsg += *myerr->filename;
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os::Printer::log(errMsg.c_str(),temp1, ELL_ERROR);
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}
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//! returns true if the file maybe is able to be loaded by this class
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bool CImageLoaderJPG::isALoadableFileFormat(io::IReadFile* file) const
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{
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if (!(file && file->seek(0)))
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return false;
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unsigned char header[3];
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size_t headerLen = file->read(header, sizeof(header));
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return headerLen >= 3 && !memcmp(header, "\xFF\xD8\xFF", 3);
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}
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//! creates a surface from the file
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IImage* CImageLoaderJPG::loadImage(io::IReadFile* file) const
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{
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if (!file)
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return 0;
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core::stringc filename = file->getFileName();
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u8 **rowPtr=0;
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u8* input = new u8[file->getSize()];
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file->read(input, file->getSize());
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// allocate and initialize JPEG decompression object
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struct jpeg_decompress_struct cinfo;
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struct irr_jpeg_error_mgr jerr;
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//We have to set up the error handler first, in case the initialization
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//step fails. (Unlikely, but it could happen if you are out of memory.)
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//This routine fills in the contents of struct jerr, and returns jerr's
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//address which we place into the link field in cinfo.
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cinfo.err = jpeg_std_error(&jerr.pub);
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cinfo.err->error_exit = error_exit;
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cinfo.err->output_message = output_message;
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jerr.filename = &filename;
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// compatibility fudge:
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// we need to use setjmp/longjmp for error handling as gcc-linux
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// crashes when throwing within external c code
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if (setjmp(jerr.setjmp_buffer))
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{
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// If we get here, the JPEG code has signaled an error.
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// We need to clean up the JPEG object and return.
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jpeg_destroy_decompress(&cinfo);
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delete [] input;
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delete [] rowPtr;
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// return null pointer
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return 0;
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}
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// Now we can initialize the JPEG decompression object.
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jpeg_create_decompress(&cinfo);
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// specify data source
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jpeg_source_mgr jsrc;
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// Set up data pointer
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jsrc.bytes_in_buffer = file->getSize();
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jsrc.next_input_byte = (JOCTET*)input;
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cinfo.src = &jsrc;
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jsrc.init_source = init_source;
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jsrc.fill_input_buffer = fill_input_buffer;
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jsrc.skip_input_data = skip_input_data;
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jsrc.resync_to_restart = jpeg_resync_to_restart;
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jsrc.term_source = term_source;
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// Decodes JPG input from whatever source
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// Does everything AFTER jpeg_create_decompress
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// and BEFORE jpeg_destroy_decompress
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// Caller is responsible for arranging these + setting up cinfo
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// read file parameters with jpeg_read_header()
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jpeg_read_header(&cinfo, TRUE);
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bool useCMYK=false;
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if (cinfo.jpeg_color_space==JCS_CMYK)
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{
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cinfo.out_color_space=JCS_CMYK;
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cinfo.out_color_components=4;
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useCMYK=true;
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}
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else
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{
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cinfo.out_color_space=JCS_RGB;
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cinfo.out_color_components=3;
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}
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cinfo.output_gamma=2.2;
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cinfo.do_fancy_upsampling=FALSE;
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// reject unreasonable sizes
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if (!checkImageDimensions(cinfo.image_width, cinfo.image_height))
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longjmp(jerr.setjmp_buffer, 1);
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// Start decompressor
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jpeg_start_decompress(&cinfo);
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// Get image data
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u32 rowspan = cinfo.image_width * cinfo.out_color_components;
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u32 width = cinfo.image_width;
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u32 height = cinfo.image_height;
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// Allocate memory for buffer
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u8* output = new u8[rowspan * height];
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// Here we use the library's state variable cinfo.output_scanline as the
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// loop counter, so that we don't have to keep track ourselves.
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// Create array of row pointers for lib
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rowPtr = new u8* [height];
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for( u32 i = 0; i < height; i++ )
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rowPtr[i] = &output[ i * rowspan ];
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u32 rowsRead = 0;
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while( cinfo.output_scanline < cinfo.output_height )
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rowsRead += jpeg_read_scanlines( &cinfo, &rowPtr[rowsRead], cinfo.output_height - rowsRead );
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delete [] rowPtr;
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// Finish decompression
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jpeg_finish_decompress(&cinfo);
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// Release JPEG decompression object
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// This is an important step since it will release a good deal of memory.
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jpeg_destroy_decompress(&cinfo);
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// convert image
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IImage* image = 0;
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if (useCMYK)
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{
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image = new CImage(ECF_R8G8B8,
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core::dimension2d<u32>(width, height));
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const u32 size = 3*width*height;
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u8* data = (u8*)image->getData();
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if (data)
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{
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for (u32 i=0,j=0; i<size; i+=3, j+=4)
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{
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// Also works without K, but has more contrast with K multiplied in
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// data[i+0] = output[j+2];
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// data[i+1] = output[j+1];
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// data[i+2] = output[j+0];
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data[i+0] = (char)(output[j+2]*(output[j+3]/255.f));
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data[i+1] = (char)(output[j+1]*(output[j+3]/255.f));
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data[i+2] = (char)(output[j+0]*(output[j+3]/255.f));
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}
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}
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delete [] output;
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}
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else
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image = new CImage(ECF_R8G8B8,
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core::dimension2d<u32>(width, height), output);
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delete [] input;
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return image;
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}
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//! creates a loader which is able to load jpeg images
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IImageLoader* createImageLoaderJPG()
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{
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return new CImageLoaderJPG();
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}
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} // end namespace video
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} // end namespace irr
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