Merge pull request #442 from felixbuenemann/test-system-webp-on-travis

Test system webp on Travis CI and fix alpha_q default value

.travis.yml

@@ -1,6 +1,5 @@
 language: cpp
 before_install:
-  - sudo add-apt-repository ppa:lyrasis/precise-backports -y
   - sudo apt-get update -qq
   - sudo apt-get install automake gtk-doc-tools 
   - sudo apt-get install gobject-introspection

libvips/foreign/webpsave.c

@@ -160,6 +160,7 @@ static void
 vips_foreign_save_webp_init( VipsForeignSaveWebp *webp )
 {
 	webp->Q = 75;
+	webp->alpha_q = 100;
 }
 
 typedef struct _VipsForeignSaveWebpFile {

test/test_formats.sh

@@ -192,7 +192,6 @@ if test_supported jpegload; then
 fi
 if test_supported webpload; then
 	test_format $image webp 90
-	test_format $image webp 0 [lossless]
 fi
 test_format $image ppm 0
 test_format $image pfm 0