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vnc: tight: add JPEG and gradient subencoding with smooth image detection

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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>
This commit is contained in:
Corentin Chary 2010-07-07 20:57:49 +02:00 • committed by Anthony Liguori
parent f58ae59c02
commit 2f6f5c7a00
5 changed files with 601 additions and 1 deletions
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33
configure vendored
View file

@ -268,6 +268,7 @@ uuid=""
vde=""
vnc_tls=""
vnc_sasl=""
vnc_jpeg=""
xen=""
linux_aio=""
attr=""
@ -575,6 +576,10 @@ for opt do
;;
--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 " --disable-vnc-tls disable TLS encryption for VNC server"
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"
@ -1245,6 +1252,27 @@ EOF
fi
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"
@ -2094,6 +2122,7 @@ echo "Block whitelist $block_drv_whitelist"
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 $sparc_cpu"
fi
@ -2231,6 +2260,10 @@ if test "$vnc_sasl" = "yes" ; then
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