From 2f6f5c7a00e2fbe4f680d6c1efa12a9cbb0ee40a Mon Sep 17 00:00:00 2001
From: Corentin Chary <corentincj@iksaif.net>
Date: Wed, 7 Jul 2010 20:57:49 +0200
Subject: 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>
---
 configure | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

(limited to 'configure')

diff --git a/configure b/configure
index b68f01a665..27791b530e 100755
--- a/configure
+++ b/configure
@@ -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
-- 
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