vnc: tight: add JPEG and gradient subencoding with smooth image detection
Add gradient filter and JPEG compression with an heuristic to detect how
lossy the comppression will be. This code has been adapted from
libvncserver/tight.c.
JPEG support can be enabled/disabled at compile time with --enable-vnc-jpeg
and --disable-vnc-jpeg.
Signed-off-by: Corentin Chary <corentincj@iksaif.net>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/configure b/configure
index b68f01a..27791b5 100755
--- a/configure
+++ b/configure
@@ -268,6 +268,7 @@
vde=""
vnc_tls=""
vnc_sasl=""
+vnc_jpeg=""
xen=""
linux_aio=""
attr=""
@@ -575,6 +576,10 @@
;;
--enable-vnc-sasl) vnc_sasl="yes"
;;
+ --disable-vnc-jpeg) vnc_jpeg="no"
+ ;;
+ --enable-vnc-jpeg) vnc_jpeg="yes"
+ ;;
--disable-slirp) slirp="no"
;;
--disable-uuid) uuid="no"
@@ -825,6 +830,8 @@
echo " --enable-vnc-tls enable TLS encryption for VNC server"
echo " --disable-vnc-sasl disable SASL encryption for VNC server"
echo " --enable-vnc-sasl enable SASL encryption for VNC server"
+echo " --disable-vnc-jpeg disable JPEG lossy compression for VNC server"
+echo " --enable-vnc-jpeg enable JPEG lossy compression for VNC server"
echo " --disable-curses disable curses output"
echo " --enable-curses enable curses output"
echo " --disable-curl disable curl connectivity"
@@ -1246,6 +1253,27 @@
fi
##########################################
+# VNC JPEG detection
+if test "$vnc_jpeg" = "yes" ; then
+cat > $TMPC <<EOF
+#include <stdio.h>
+#include <jpeglib.h>
+int main(void) { struct jpeg_compress_struct s; jpeg_create_compress(&s); return 0; }
+EOF
+ vnc_jpeg_cflags=""
+ vnc_jpeg_libs="-ljpeg"
+ if compile_prog "$vnc_jpeg_cflags" "$vnc_jpeg_libs" ; then
+ vnc_jpeg=yes
+ libs_softmmu="$vnc_jpeg_libs $libs_softmmu"
+ else
+ if test "$vnc_jpeg" = "yes" ; then
+ feature_not_found "vnc-jpeg"
+ fi
+ vnc_jpeg=no
+ fi
+fi
+
+##########################################
# fnmatch() probe, used for ACL routines
fnmatch="no"
cat > $TMPC << EOF
@@ -2094,6 +2122,7 @@
echo "Mixer emulation $mixemu"
echo "VNC TLS support $vnc_tls"
echo "VNC SASL support $vnc_sasl"
+echo "VNC JPEG support $vnc_jpeg"
if test -n "$sparc_cpu"; then
echo "Target Sparc Arch $sparc_cpu"
fi
@@ -2231,6 +2260,10 @@
echo "CONFIG_VNC_SASL=y" >> $config_host_mak
echo "VNC_SASL_CFLAGS=$vnc_sasl_cflags" >> $config_host_mak
fi
+if test "$vnc_jpeg" = "yes" ; then
+ echo "CONFIG_VNC_JPEG=y" >> $config_host_mak
+ echo "VNC_JPEG_CFLAGS=$vnc_jpeg_cflags" >> $config_host_mak
+fi
if test "$fnmatch" = "yes" ; then
echo "CONFIG_FNMATCH=y" >> $config_host_mak
fi
