Bundled libwebp updated to version 0.6.0

This commit imports libwebp 0.6.0, including AUTHORS, COPYING, ChangeLog,
NEWS, PATENTS, README and src directories. In src, only includes header
and source files.

Upstream changes since 0.5.1 have been merged in.
Also updated version in qt_attribution.json.

Conflicts:
	src/3rdparty/libwebp.pri
	src/3rdparty/libwebp/qt_attribution.json
	src/3rdparty/libwebp/src/webp/config.h

Change-Id: I001aa7a3fabf0130b54f9005c23aa822bc1d0ec1
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>

1 files changed, 46 insertions, 12 deletions

diff --git a/src/3rdparty/libwebp/README b/src/3rdparty/libwebp/README
index 90f8f10..4c15c4a 100644
--- a/src/3rdparty/libwebp/README
+++ b/src/3rdparty/libwebp/README
@@ -4,7 +4,7 @@
           \__\__/\____/\_____/__/ ____  ___
                 / _/ /    \    \ /  _ \/ _/
                /  \_/   / /   \ \   __/  \__
-               \____/____/\_____/_____/____/v0.5.1
+               \____/____/\_____/_____/____/v0.6.0
 
 Description:
 ============
@@ -220,8 +220,9 @@ assumed to be a PNG, JPEG, TIFF or WebP file.
 Options:
   -h / -help ............. short help
   -H / -longhelp ......... long help
-  -q <float> ............. quality factor (0:small..100:big)
-  -alpha_q <int> ......... transparency-compression quality (0..100)
+  -q <float> ............. quality factor (0:small..100:big), default=75
+  -alpha_q <int> ......... transparency-compression quality (0..100),
+                           default=100
   -preset <string> ....... preset setting, one of:
                             default, photo, picture,
                             drawing, icon, text
@@ -229,17 +230,18 @@ Options:
   -z <int> ............... activates lossless preset with given
                            level in [0:fast, ..., 9:slowest]
 
-  -m <int> ............... compression method (0=fast, 6=slowest)
-  -segments <int> ........ number of segments to use (1..4)
+  -m <int> ............... compression method (0=fast, 6=slowest), default=4
+  -segments <int> ........ number of segments to use (1..4), default=4
   -size <int> ............ target size (in bytes)
   -psnr <float> .......... target PSNR (in dB. typically: 42)
 
   -s <int> <int> ......... input size (width x height) for YUV
-  -sns <int> ............. spatial noise shaping (0:off, 100:max)
-  -f <int> ............... filter strength (0=off..100)
-  -sharpness <int> ....... filter sharpness (0:most .. 7:least sharp)
+  -sns <int> ............. spatial noise shaping (0:off, 100:max), default=50
+  -f <int> ............... filter strength (0=off..100), default=60
+  -sharpness <int> ....... filter sharpness (0:most .. 7:least sharp), default=0
   -strong ................ use strong filter instead of simple (default)
   -nostrong .............. use simple filter instead of strong
+  -sharp_yuv ............. use sharper (and slower) RGB->YUV conversion
   -partition_limit <int> . limit quality to fit the 512k limit on
                            the first partition (0=no degradation ... 100=full)
   -pass <int> ............ analysis pass number (1..10)
@@ -252,18 +254,18 @@ Options:
   -print_ssim ............ prints averaged SSIM distortion
   -print_lsim ............ prints local-similarity distortion
   -d <file.pgm> .......... dump the compressed output (PGM file)
-  -alpha_method <int> .... transparency-compression method (0..1)
+  -alpha_method <int> .... transparency-compression method (0..1), default=1
   -alpha_filter <string> . predictive filtering for alpha plane,
                            one of: none, fast (default) or best
-  -exact ................. preserve RGB values in transparent area
+  -exact ................. preserve RGB values in transparent area, default=off
   -blend_alpha <hex> ..... blend colors against background color
                            expressed as RGB values written in
                            hexadecimal, e.g. 0xc0e0d0 for red=0xc0
                            green=0xe0 and blue=0xd0
   -noalpha ............... discard any transparency information
-  -lossless .............. encode image losslessly
+  -lossless .............. encode image losslessly, default=off
   -near_lossless <int> ... use near-lossless image
-                           preprocessing (0..100=off)
+                           preprocessing (0..100=off), default=100
   -hint <string> ......... specify image characteristics hint,
                            one of: photo, picture or graph
 
@@ -383,6 +385,7 @@ Options are:
 Keyboard shortcuts:
   'c' ................ toggle use of color profile
   'i' ................ overlay file information
+  'd' ................ disable blending & disposal (debug)
   'q' / 'Q' / ESC .... quit
 
 Building:
@@ -411,6 +414,37 @@ $ make -f makefile.unix examples/vwebp
 > nmake /f Makefile.vc CFG=release-static \
     ../obj/x64/release-static/bin/vwebp.exe
 
+Animation creation tool:
+========================
+The utility 'img2webp' can turn a sequence of input images (PNG, JPEG, ...)
+into an animated WebP file. It offers fine control over duration, encoding
+modes, etc.
+
+Usage:
+
+  img2webp [file-level options] [image files...] [per-frame options...]
+
+File-level options (only used at the start of compression):
+ -min_size ............ minimize size
+ -loop <int> .......... loop count (default: 0, = infinite loop)
+ -kmax <int> .......... maximum number of frame between key-frames
+                        (0=only keyframes)
+ -kmin <int> .......... minimum number of frame between key-frames
+                        (0=disable key-frames altogether)
+ -mixed ............... use mixed lossy/lossless automatic mode
+ -v ................... verbose mode
+ -h ................... this help
+
+Per-frame options (only used for subsequent images input):
+ -d <int> ............. frame duration in ms (default: 100)
+ -lossless  ........... use lossless mode (default)
+ -lossy ... ........... use lossy mode
+ -q <float> ........... quality
+ -m <int> ............. method to use
+
+example: img2webp -loop 2 in0.png -lossy in1.jpg
+                  -d 80 in2.tiff -o out.webp
+
 Animated GIF conversion:
 ========================
 Animated GIF files can be converted to WebP files with animation using the