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, 29 insertions, 14 deletions

diff --git a/src/3rdparty/libwebp/src/webp/encode.h b/src/3rdparty/libwebp/src/webp/encode.h
index 9291b71..35fde1d 100644
--- a/src/3rdparty/libwebp/src/webp/encode.h
+++ b/src/3rdparty/libwebp/src/webp/encode.h
@@ -20,7 +20,7 @@
 extern "C" {
 #endif
 
-#define WEBP_ENCODER_ABI_VERSION 0x0209    // MAJOR(8b) + MINOR(8b)
+#define WEBP_ENCODER_ABI_VERSION 0x020e    // MAJOR(8b) + MINOR(8b)
 
 // Note: forward declaring enumerations is not allowed in (strict) C and C++,
 // the types are left here for reference.
@@ -141,12 +141,10 @@ struct WebPConfig {
                           // RGB information for better compression. The default
                           // value is 0.
 
-#ifdef WEBP_EXPERIMENTAL_FEATURES
-  int delta_palettization;
+  int use_delta_palette;  // reserved for future lossless feature
+  int use_sharp_yuv;      // if needed, use sharp (and slow) RGB->YUV conversion
+
   uint32_t pad[2];        // padding for later use
-#else
-  uint32_t pad[3];        // padding for later use
-#endif  // WEBP_EXPERIMENTAL_FEATURES
 };
 
 // Enumerate some predefined settings for WebPConfig, depending on the type
@@ -388,9 +386,24 @@ WEBP_EXTERN(void) WebPPictureFree(WebPPicture* picture);
 // Returns false in case of memory allocation error.
 WEBP_EXTERN(int) WebPPictureCopy(const WebPPicture* src, WebPPicture* dst);
 
+// Compute the single distortion for packed planes of samples.
+// 'src' will be compared to 'ref', and the raw distortion stored into
+// '*distortion'. The refined metric (log(MSE), log(1 - ssim),...' will be
+// stored in '*result'.
+// 'x_step' is the horizontal stride (in bytes) between samples.
+// 'src/ref_stride' is the byte distance between rows.
+// Returns false in case of error (bad parameter, memory allocation error, ...).
+WEBP_EXTERN(int) WebPPlaneDistortion(const uint8_t* src, size_t src_stride,
+                                     const uint8_t* ref, size_t ref_stride,
+                                     int width, int height,
+                                     size_t x_step,
+                                     int type,   // 0 = PSNR, 1 = SSIM, 2 = LSIM
+                                     float* distortion, float* result);
+
 // Compute PSNR, SSIM or LSIM distortion metric between two pictures. Results
-// are in dB, stored in result[] in the Y/U/V/Alpha/All or B/G/R/A/All order.
-// Returns false in case of error (src and ref don't have same dimension, ...)
+// are in dB, stored in result[] in the B/G/R/A/All order. The distortion is
+// always performed using ARGB samples. Hence if the input is YUV(A), the
+// picture will be internally converted to ARGB (just for the measurement).
 // Warning: this function is rather CPU-intensive.
 WEBP_EXTERN(int) WebPPictureDistortion(
     const WebPPicture* src, const WebPPicture* ref,
@@ -473,18 +486,20 @@ WEBP_EXTERN(int) WebPPictureARGBToYUVA(WebPPicture* picture,
 WEBP_EXTERN(int) WebPPictureARGBToYUVADithered(
     WebPPicture* picture, WebPEncCSP colorspace, float dithering);
 
-// Performs 'smart' RGBA->YUVA420 downsampling and colorspace conversion.
+// Performs 'sharp' RGBA->YUVA420 downsampling and colorspace conversion.
 // Downsampling is handled with extra care in case of color clipping. This
 // method is roughly 2x slower than WebPPictureARGBToYUVA() but produces better
-// YUV representation.
+// and sharper YUV representation.
 // Returns false in case of error.
+WEBP_EXTERN(int) WebPPictureSharpARGBToYUVA(WebPPicture* picture);
+// kept for backward compatibility:
 WEBP_EXTERN(int) WebPPictureSmartARGBToYUVA(WebPPicture* picture);
 
 // Converts picture->yuv to picture->argb and sets picture->use_argb to true.
-// The input format must be YUV_420 or YUV_420A.
-// Note that the use of this method is discouraged if one has access to the
-// raw ARGB samples, since using YUV420 is comparatively lossy. Also, the
-// conversion from YUV420 to ARGB incurs a small loss too.
+// The input format must be YUV_420 or YUV_420A. The conversion from YUV420 to
+// ARGB incurs a small loss too.
+// Note that the use of this colorspace is discouraged if one has access to the
+// raw ARGB samples, since using YUV420 is comparatively lossy.
 // Returns false in case of error.
 WEBP_EXTERN(int) WebPPictureYUVAToARGB(WebPPicture* picture);