JpegEncoder implemented. It compresses full-color pixel data with JPEG sub-encoding of Tight encoding.
git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@2322 3789f03b-4d11-0410-bbf8-ca57d06f2519
diff --git a/common/rfb/JpegEncoder.cxx b/common/rfb/JpegEncoder.cxx
new file mode 100644
index 0000000..6f980b7
--- /dev/null
+++ b/common/rfb/JpegEncoder.cxx
@@ -0,0 +1,79 @@
+/* Copyright (C) 2007 Constantin Kaplinsky. All Rights Reserved.
+ *
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This software 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+ * USA.
+ */
+
+#include <rfb/JpegEncoder.h>
+#include <rdr/OutStream.h>
+#include <rfb/encodings.h>
+
+using namespace rfb;
+
+const int JpegEncoder::qualityMap[10] = {
+ 5, 10, 15, 25, 37, 50, 60, 70, 75, 80
+};
+
+JpegEncoder::JpegEncoder(SMsgWriter* writer_) : writer(writer_)
+{
+ jcomp = new StandardJpegCompressor;
+ jcomp->setQuality(qualityMap[6]);
+}
+
+JpegEncoder::~JpegEncoder()
+{
+ delete jcomp;
+}
+
+void JpegEncoder::setQualityLevel(int level)
+{
+ if (level >= 0 && level <= 9) {
+ jcomp->setQuality(qualityMap[level]);
+ }
+}
+
+bool JpegEncoder::writeRect(PixelBuffer* pb, const Rect& r)
+{
+ int serverBitsPerPixel = pb->getPF().bpp;
+ int clientBitsPerPixel = writer->bpp();
+
+ // FIXME: Implement JPEG compression for (serverBitsPerPixel == 16).
+ // FIXME: Check that all color components are actually 8 bits wide.
+ if (serverBitsPerPixel != 32 || clientBitsPerPixel < 16) {
+ // FIXME: Make sure this return value is checked properly.
+ return false;
+ }
+
+ writer->startRect(r, encodingTight);
+ rdr::OutStream* os = writer->getOutStream();
+
+ // Get access to pixel data
+ int stride;
+ const rdr::U32* pixels = (const rdr::U32 *)pb->getPixelsR(r, &stride);
+ const PixelFormat& fmt = pb->getPF();
+
+ // Encode data
+ jcomp->compress(pixels, &fmt, r.width(), r.height(), stride);
+
+ // Write Tight-encoded header and JPEG data.
+ os->writeU8(0x09 << 4);
+ os->writeCompactLength(jcomp->getDataLength());
+ os->writeBytes(jcomp->getDataPtr(), jcomp->getDataLength());
+
+ writer->endRect();
+
+ return true;
+}
+