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/*
Copyright (C) 2009 Red Hat, Inc.
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 2.1 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 "common.h"
#include "jpeg_decoder.h"
#include "debug.h"
#include "utils.h"
static void op_begin_decode(SpiceJpegDecoder *decoder,
uint8_t* data,
int data_size,
int* out_width,
int* out_height)
{
JpegDecoder* _decoder = static_cast<JpegDecoder*>(decoder);
_decoder->begin_decode(data, data_size, *out_width, *out_height);
}
static void op_decode(SpiceJpegDecoder *decoder,
uint8_t* dest,
int stride,
int format)
{
JpegDecoder* _decoder = static_cast<JpegDecoder*>(decoder);
_decoder->decode(dest, stride, format);
}
extern "C" {
void jpeg_decoder_init_source(j_decompress_ptr cinfo)
{
}
static boolean jpeg_decoder_fill_input_buffer(j_decompress_ptr cinfo)
{
PANIC("no more data for jpeg");
return FALSE;
}
static void jpeg_decoder_skip_input_data(j_decompress_ptr cinfo, long num_bytes)
{
ASSERT(num_bytes < (long)cinfo->src->bytes_in_buffer);
cinfo->src->next_input_byte += num_bytes;
cinfo->src->bytes_in_buffer -= num_bytes;
}
static void jpeg_decoder_term_source (j_decompress_ptr cinfo)
{
return;
}
}
JpegDecoder::JpegDecoder()
: _data (NULL)
, _data_size (0)
{
_cinfo.err = jpeg_std_error(&_jerr);
jpeg_create_decompress(&_cinfo);
_cinfo.src = &_jsrc;
_cinfo.src->init_source = jpeg_decoder_init_source;
_cinfo.src->fill_input_buffer = jpeg_decoder_fill_input_buffer;
_cinfo.src->skip_input_data = jpeg_decoder_skip_input_data;
_cinfo.src->resync_to_restart = jpeg_resync_to_restart;
_cinfo.src->term_source = jpeg_decoder_term_source;
static SpiceJpegDecoderOps decoder_ops = {
op_begin_decode,
op_decode,
};
ops = &decoder_ops;
}
JpegDecoder::~JpegDecoder()
{
jpeg_destroy_decompress(&_cinfo);
}
void JpegDecoder::begin_decode(uint8_t* data, int data_size, int& out_width, int& out_height)
{
ASSERT(data);
ASSERT(data_size);
if (_data) {
jpeg_abort_decompress(&_cinfo);
}
_data = data;
_data_size = data_size;
_cinfo.src->next_input_byte = _data;
_cinfo.src->bytes_in_buffer = _data_size;
jpeg_read_header(&_cinfo, TRUE);
_cinfo.out_color_space = JCS_RGB;
_width = _cinfo.image_width;
_height = _cinfo.image_height;
out_width = _width;
out_height = _height;
}
void JpegDecoder::decode(uint8_t *dest, int stride, int format)
{
uint8_t* scan_line = new uint8_t[_width*3];
RGBConverter* rgb_converter;
switch (format) {
case SPICE_BITMAP_FMT_24BIT:
rgb_converter = &_rgb2bgr;
break;
case SPICE_BITMAP_FMT_32BIT:
rgb_converter = &_rgb2bgrx;
break;
default:
THROW("bad bitmap format, %d", format);
}
jpeg_start_decompress(&_cinfo);
for (int row = 0; row < _height; row++) {
jpeg_read_scanlines(&_cinfo, &scan_line, 1);
rgb_converter->convert(scan_line, dest, _width);
dest += stride;
}
delete [] scan_line;
jpeg_finish_decompress(&_cinfo);
}
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