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#ifndef __JPEGCOMPRESSOR_H__
#define __JPEGCOMPRESSOR_H__
#include <stdio.h>
#include <sys/types.h>
extern "C" {
#include <jpeg/jpeglib.h>
}
#include <rdr/types.h>
#include <rfb/PixelFormat.h>
namespace rfb {
//
// An abstract interface for performing JPEG compression.
//
class JpegCompressor
{
public:
virtual ~JpegCompressor() {}
// Set JPEG quality level (0..100)
virtual void setQuality(int level) = 0;
// Actually compress an image.
virtual void compress(const rdr::U32 *buf, const PixelFormat *fmt,
int w, int h, int stride) = 0;
// Access results of the compression.
virtual size_t getDataLength() = 0;
virtual const char *getDataPtr() = 0;
};
//
// A C++ class for performing JPEG compression via the
// Independent JPEG Group's software (free JPEG library).
//
class StandardJpegCompressor : public JpegCompressor
{
public:
StandardJpegCompressor();
virtual ~StandardJpegCompressor();
// Set JPEG quality level (0..100)
virtual void setQuality(int level);
// Actually compress the image.
virtual void compress(const rdr::U32 *buf, const PixelFormat *fmt,
int w, int h, int stride);
// Access results of the compression.
virtual size_t getDataLength() { return m_cdata_ready; }
virtual const char *getDataPtr() { return (const char *)m_cdata; }
public:
// Our implementation of JPEG destination manager. These three
// functions should never be called directly. They are made public
// because they should be accessible from C-compatible functions
// called by the JPEG library.
void initDestination();
bool emptyOutputBuffer();
void termDestination();
protected:
static const int ALLOC_CHUNK_SIZE;
static const int DEFAULT_QUALITY;
struct jpeg_compress_struct m_cinfo;
struct jpeg_error_mgr m_jerr;
unsigned char *m_cdata;
size_t m_cdata_allocated;
size_t m_cdata_ready;
};
}
#endif // __JPEGCOMPRESSOR_H__
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