vnc: tight add PNG encoding
Introduce a new encoding: VNC_ENCODING_TIGHT_PNG [1] (-269) with a new
tight filter VNC_TIGHT_PNG (0x0A). When the client tells it supports the Tight PNG
encoding, the server will use tight, but will always send encoding pixels using
PNG instead of zlib. If the client also told it support JPEG, then the server can
send JPEG, because PNG will only be used in the cases zlib was used in normal tight.
This encoding was introduced to speed up HTML5 based VNC clients like noVNC [2], but
can also be used on devices like iPhone where PNG can be rendered in hardware.
[1] http://wiki.qemu.org/VNC_Tight_PNG
[2] http://github.com/kanaka/noVNC/
Signed-off-by: Corentin Chary <corentincj@iksaif.net>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/configure b/configure
index 33e98a4..59e9385 100755
--- a/configure
+++ b/configure
@@ -269,6 +269,7 @@
vnc_tls=""
vnc_sasl=""
vnc_jpeg=""
+vnc_png=""
xen=""
linux_aio=""
attr=""
@@ -580,6 +581,10 @@
;;
--enable-vnc-jpeg) vnc_jpeg="yes"
;;
+ --disable-vnc-png) vnc_png="no"
+ ;;
+ --enable-vnc-png) vnc_png="yes"
+ ;;
--disable-slirp) slirp="no"
;;
--disable-uuid) uuid="no"
@@ -832,6 +837,8 @@
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-vnc-png disable PNG compression for VNC server"
+echo " --enable-vnc-png enable PNG compression for VNC server"
echo " --disable-curses disable curses output"
echo " --enable-curses enable curses output"
echo " --disable-curl disable curl connectivity"
@@ -1274,6 +1281,31 @@
fi
##########################################
+# VNC PNG detection
+if test "$vnc_png" = "yes" ; then
+cat > $TMPC <<EOF
+//#include <stdio.h>
+#include <png.h>
+int main(void) {
+ png_structp png_ptr;
+ png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+ return 0;
+}
+EOF
+ vnc_png_cflags=""
+ vnc_png_libs="-lpng"
+ if compile_prog "$vnc_png_cflags" "$vnc_png_libs" ; then
+ vnc_png=yes
+ libs_softmmu="$vnc_png_libs $libs_softmmu"
+ else
+ if test "$vnc_png" = "yes" ; then
+ feature_not_found "vnc-png"
+ fi
+ vnc_png=no
+ fi
+fi
+
+##########################################
# fnmatch() probe, used for ACL routines
fnmatch="no"
cat > $TMPC << EOF
@@ -2123,6 +2155,7 @@
echo "VNC TLS support $vnc_tls"
echo "VNC SASL support $vnc_sasl"
echo "VNC JPEG support $vnc_jpeg"
+echo "VNC PNG support $vnc_png"
if test -n "$sparc_cpu"; then
echo "Target Sparc Arch $sparc_cpu"
fi
@@ -2264,6 +2297,10 @@
echo "CONFIG_VNC_JPEG=y" >> $config_host_mak
echo "VNC_JPEG_CFLAGS=$vnc_jpeg_cflags" >> $config_host_mak
fi
+if test "$vnc_png" = "yes" ; then
+ echo "CONFIG_VNC_PNG=y" >> $config_host_mak
+ echo "VNC_PNG_CFLAGS=$vnc_png_cflags" >> $config_host_mak
+fi
if test "$fnmatch" = "yes" ; then
echo "CONFIG_FNMATCH=y" >> $config_host_mak
fi
