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// Copyright (C) 2002-2012 Nikolaus Gebhardt
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h
#include "CImageWriterJPG.h"
#ifdef _IRR_COMPILE_WITH_JPG_WRITER_
#include "CColorConverter.h"
#include "IWriteFile.h"
#include "CImage.h"
#include "irrString.h"
#ifdef _IRR_COMPILE_WITH_LIBJPEG_
#include <stdio.h> // required for jpeglib.h
extern "C"
{
#ifndef _IRR_USE_NON_SYSTEM_JPEG_LIB_
#include <jpeglib.h>
#include <jerror.h>
#else
#include "jpeglib/jpeglib.h"
#include "jpeglib/jerror.h"
#endif
}
namespace irr
{
namespace video
{
// The writer uses a 4k buffer and flushes to disk each time it's filled
#define OUTPUT_BUF_SIZE 4096
typedef struct
{
struct jpeg_destination_mgr pub;/* public fields */
io::IWriteFile* file; /* target file */
JOCTET buffer[OUTPUT_BUF_SIZE]; /* image buffer */
} mem_destination_mgr;
typedef mem_destination_mgr * mem_dest_ptr;
// init
static void jpeg_init_destination(j_compress_ptr cinfo)
{
mem_dest_ptr dest = (mem_dest_ptr) cinfo->dest;
dest->pub.next_output_byte = dest->buffer;
dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
}
// flush to disk and reset buffer
static boolean jpeg_empty_output_buffer(j_compress_ptr cinfo)
{
mem_dest_ptr dest = (mem_dest_ptr) cinfo->dest;
// for now just exit upon file error
if (dest->file->write(dest->buffer, OUTPUT_BUF_SIZE) != OUTPUT_BUF_SIZE)
ERREXIT (cinfo, JERR_FILE_WRITE);
dest->pub.next_output_byte = dest->buffer;
dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
return TRUE;
}
static void jpeg_term_destination(j_compress_ptr cinfo)
{
mem_dest_ptr dest = (mem_dest_ptr) cinfo->dest;
const s32 datacount = (s32)(OUTPUT_BUF_SIZE - dest->pub.free_in_buffer);
// for now just exit upon file error
if (dest->file->write(dest->buffer, datacount) != datacount)
ERREXIT (cinfo, JERR_FILE_WRITE);
}
// set up buffer data
static void jpeg_file_dest(j_compress_ptr cinfo, io::IWriteFile* file)
{
if (cinfo->dest == NULL)
{ /* first time for this JPEG object? */
cinfo->dest = (struct jpeg_destination_mgr *)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo,
JPOOL_PERMANENT,
sizeof(mem_destination_mgr));
}
mem_dest_ptr dest = (mem_dest_ptr) cinfo->dest; /* for casting */
/* Initialize method pointers */
dest->pub.init_destination = jpeg_init_destination;
dest->pub.empty_output_buffer = jpeg_empty_output_buffer;
dest->pub.term_destination = jpeg_term_destination;
/* Initialize private member */
dest->file = file;
}
/* write_JPEG_memory: store JPEG compressed image into memory.
*/
static bool writeJPEGFile(io::IWriteFile* file, IImage* image, u32 quality)
{
void (*format)(const void*, s32, void*) = 0;
switch( image->getColorFormat () )
{
case ECF_R8G8B8:
format = CColorConverter::convert_R8G8B8toR8G8B8;
break;
case ECF_A8R8G8B8:
format = CColorConverter::convert_A8R8G8B8toR8G8B8;
break;
case ECF_A1R5G5B5:
format = CColorConverter::convert_A1R5G5B5toB8G8R8;
break;
case ECF_R5G6B5:
format = CColorConverter::convert_R5G6B5toR8G8B8;
break;
#ifndef _DEBUG
default:
break;
#endif
}
// couldn't find a color converter
if ( 0 == format )
return false;
const core::dimension2du dim = image->getDimension();
struct jpeg_compress_struct cinfo;
struct jpeg_error_mgr jerr;
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_compress(&cinfo);
jpeg_file_dest(&cinfo, file);
cinfo.image_width = dim.Width;
cinfo.image_height = dim.Height;
cinfo.input_components = 3;
cinfo.in_color_space = JCS_RGB;
jpeg_set_defaults(&cinfo);
if ( 0 == quality )
quality = 75;
jpeg_set_quality(&cinfo, quality, TRUE);
jpeg_start_compress(&cinfo, TRUE);
u8 * dest = new u8[dim.Width*3];
if (dest)
{
const u32 pitch = image->getPitch();
JSAMPROW row_pointer[1]; /* pointer to JSAMPLE row[s] */
row_pointer[0] = dest;
u8* src = (u8*)image->lock();
while (cinfo.next_scanline < cinfo.image_height)
{
// convert next line
format( src, dim.Width, dest );
src += pitch;
jpeg_write_scanlines(&cinfo, row_pointer, 1);
}
image->unlock();
delete [] dest;
/* Step 6: Finish compression */
jpeg_finish_compress(&cinfo);
}
/* Step 7: Destroy */
jpeg_destroy_compress(&cinfo);
return (dest != 0);
}
} // namespace video
} // namespace irr
#endif // _IRR_COMPILE_WITH_LIBJPEG_
namespace irr
{
namespace video
{
IImageWriter* createImageWriterJPG()
{
return new CImageWriterJPG;
}
CImageWriterJPG::CImageWriterJPG()
{
#ifdef _DEBUG
setDebugName("CImageWriterJPG");
#endif
}
bool CImageWriterJPG::isAWriteableFileExtension(const io::path& filename) const
{
return core::hasFileExtension ( filename, "jpg", "jpeg" );
}
bool CImageWriterJPG::writeImage(io::IWriteFile *file, IImage *image, u32 quality) const
{
#ifndef _IRR_COMPILE_WITH_LIBJPEG_
return false;
#else
return writeJPEGFile(file, image, quality);
#endif
}
} // namespace video
} // namespace irr
#endif
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