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/*
* libopenraw - jfifcontainer.h
*
* Copyright (C) 2006-2007 Hubert Figuiere
*
* This library is free software: you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*/
#include <setjmp.h>
#include <cstdio>
namespace JPEG {
/*
* The extern "C" below is REQUIRED for libjpeg-mmx-dev
* as found on debian because some people have this installed.
*/
extern "C" {
#include <jpeglib.h>
}
}
#include <string.h>
#include <libopenraw++/bitmapdata.h>
#include "io/stream.h"
#include "debug.h"
#include "jfifcontainer.h"
namespace OpenRaw {
using namespace Debug;
namespace Internals {
/** private source struct for libjpeg
*/
#define BUF_SIZE 1024
typedef struct {
struct JPEG::jpeg_source_mgr pub; /**< the public libjpeg struct */
JFIFContainer * self; /**< pointer to the owner */
off_t offset;
JPEG::JOCTET* buf;
} jpeg_src_t;
JFIFContainer::JFIFContainer(IO::Stream *_file, off_t offset)
: RawContainer(_file, offset),
m_cinfo(), m_jerr(),
m_headerLoaded(false)
{
setEndian(ENDIAN_BIG);
/* this is a hack because jpeg_create_decompress is
* implemented as a Macro
*/
using namespace JPEG;
m_cinfo.err = JPEG::jpeg_std_error(&m_jerr);
m_jerr.error_exit = &j_error_exit;
JPEG::jpeg_create_decompress(&m_cinfo);
/* inspired by jdatasrc.c */
jpeg_src_t *src = (jpeg_src_t *)
(*m_cinfo.mem->alloc_small)((JPEG::j_common_ptr)&m_cinfo,
JPOOL_PERMANENT,
sizeof(jpeg_src_t));
m_cinfo.src = (JPEG::jpeg_source_mgr*)src;
src->pub.init_source = j_init_source;
src->pub.fill_input_buffer = j_fill_input_buffer;
src->pub.skip_input_data = j_skip_input_data;
src->pub.resync_to_restart = JPEG::jpeg_resync_to_restart;
src->pub.term_source = j_term_source;
src->self = this;
src->pub.bytes_in_buffer = 0;
src->pub.next_input_byte = NULL;
src->buf = (JPEG::JOCTET*)(*m_cinfo.mem->alloc_small)
((JPEG::j_common_ptr)&m_cinfo,
JPOOL_PERMANENT,
BUF_SIZE * sizeof(JPEG::JOCTET));
}
JFIFContainer::~JFIFContainer()
{
JPEG::jpeg_destroy_decompress(&m_cinfo);
}
bool JFIFContainer::getDimensions(uint32_t &x, uint32_t &y)
{
if(!m_headerLoaded) {
if (_loadHeader() == 0) {
Trace(DEBUG1) << "load header failed\n";
return false;
}
}
x = m_cinfo.output_width;
y = m_cinfo.output_height;
return true;
}
bool JFIFContainer::getDecompressedData(BitmapData &data)
{
if(!m_headerLoaded) {
if (_loadHeader() == 0) {
Trace(DEBUG1) << "load header failed\n";
return false;
}
}
if (::setjmp(m_jpegjmp) != 0) {
return false;
}
JPEG::jpeg_start_decompress(&m_cinfo);
int row_size = m_cinfo.output_width * m_cinfo.output_components;
char *dataPtr = (char*)data.allocData(row_size * m_cinfo.output_height);
char *currentPtr = dataPtr;
JPEG::JSAMPARRAY buffer = (*m_cinfo.mem->alloc_sarray)((JPEG::j_common_ptr)&m_cinfo,
JPOOL_IMAGE, row_size,
1);
while (m_cinfo.output_scanline < m_cinfo.output_height) {
jpeg_read_scanlines(&m_cinfo, buffer, 1);
memcpy(currentPtr, buffer, row_size);
currentPtr += row_size;
}
data.setDimensions(m_cinfo.output_width, m_cinfo.output_height);
JPEG::jpeg_finish_decompress(&m_cinfo);
return true;
}
int JFIFContainer::_loadHeader()
{
int ret = 0;
if (::setjmp(m_jpegjmp) == 0) {
ret = JPEG::jpeg_read_header(&m_cinfo, TRUE);
//Trace(DEBUG1) << "jpeg_read_header " << ret << "\n";
JPEG::jpeg_calc_output_dimensions(&m_cinfo);
}
m_headerLoaded = (ret == 1);
return ret;
}
void JFIFContainer::j_error_exit(JPEG::j_common_ptr cinfo)
{
(*cinfo->err->output_message) (cinfo);
JFIFContainer *self = ((jpeg_src_t *)(((JPEG::j_decompress_ptr)cinfo)->src))->self;
::longjmp(self->m_jpegjmp, 1);
}
void JFIFContainer::j_init_source(JPEG::j_decompress_ptr)
{
}
JPEG::boolean
JFIFContainer::j_fill_input_buffer(JPEG::j_decompress_ptr cinfo)
{
jpeg_src_t *src = (jpeg_src_t*)cinfo->src;
JFIFContainer *self = src->self;
int n = self->file()->read(src->buf, BUF_SIZE * sizeof(*src->buf));
if (n >= 0) {
src->pub.next_input_byte = src->buf;
src->pub.bytes_in_buffer = n;
}
else {
src->pub.next_input_byte = NULL;
src->pub.bytes_in_buffer = 0;
}
return TRUE;
}
void JFIFContainer::j_skip_input_data(JPEG::j_decompress_ptr cinfo,
long num_bytes)
{
jpeg_src_t *src = (jpeg_src_t*)cinfo->src;
if (num_bytes > 0) {
while ((size_t)num_bytes > src->pub.bytes_in_buffer) {
num_bytes -= src->pub.bytes_in_buffer;
j_fill_input_buffer(cinfo);
}
src->pub.next_input_byte += (size_t) num_bytes;
src->pub.bytes_in_buffer -= (size_t) num_bytes;
}
}
void JFIFContainer::j_term_source(JPEG::j_decompress_ptr)
{
}
}
}
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