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/* -*- Mode: C; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
Copyright (C) 2010 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/>.
*/
#ifndef _H_JPEG_DECODER
#define _H_JPEG_DECODER
#include "common.h"
#include "canvas_base.h"
#ifdef WIN32
/* We need some hacks to avoid warnings from the jpeg headers */
#define XMD_H
#undef FAR
#endif
extern "C" {
#include <jpeglib.h>
}
class RGBConverter {
public:
virtual ~RGBConverter() {}
virtual void convert(uint8_t* src, uint8_t* dest, int width) = 0;
};
class RGBToBGRConverter : public RGBConverter {
public:
void convert(uint8_t* src, uint8_t* dest, int width)
{
for (int x = 0; x < width; x++) {
*dest++ = src[2];
*dest++ = src[1];
*dest++ = src[0];
src += 3;
}
}
};
class RGBToBGRXConverter : public RGBConverter {
public:
void convert(uint8_t* src, uint8_t* dest, int width)
{
for (int x = 0; x < width; x++) {
*dest++ = src[2];
*dest++ = src[1];
*dest++ = src[0];
*dest++ = 0;
src += 3;
}
}
};
class JpegDecoder : public SpiceJpegDecoder {
public:
JpegDecoder();
~JpegDecoder();
void begin_decode(uint8_t* data, int data_size, int& out_width, int& out_height);
/* format is SPICE_BITMAP_FMT_<X> for the dest; currently, only
x=32BIT and x=24BIT are supported */
void decode(uint8_t* dest, int stride, int format);
private:
struct jpeg_decompress_struct _cinfo;
struct jpeg_error_mgr _jerr;
struct jpeg_source_mgr _jsrc;
uint8_t* _data;
int _data_size;
int _width;
int _height;
RGBToBGRConverter _rgb2bgr;
RGBToBGRXConverter _rgb2bgrx;
};
#endif
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