Added JpegCompressor abstract class and two implementations -- one cross-platform and another IRIX-specific.
git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@2320 3789f03b-4d11-0410-bbf8-ca57d06f2519
diff --git a/common/rfb/JpegCompressor.h b/common/rfb/JpegCompressor.h
new file mode 100644
index 0000000..93fdc7b
--- /dev/null
+++ b/common/rfb/JpegCompressor.h
@@ -0,0 +1,82 @@
+#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__
+