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, 85 insertions, 0 deletions

diff --git a/src/3rdparty/libwebp/src/utils/color_cache_utils.h b/src/3rdparty/libwebp/src/utils/color_cache_utils.h
new file mode 100644
index 0000000..c373e6b
--- /dev/null
+++ b/src/3rdparty/libwebp/src/utils/color_cache_utils.h
@@ -0,0 +1,85 @@
+// Copyright 2012 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS. All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+// -----------------------------------------------------------------------------
+//
+// Color Cache for WebP Lossless
+//
+// Authors: Jyrki Alakuijala (jyrki@google.com)
+//          Urvang Joshi (urvang@google.com)
+
+#ifndef WEBP_UTILS_COLOR_CACHE_H_
+#define WEBP_UTILS_COLOR_CACHE_H_
+
+#include "../webp/types.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Main color cache struct.
+typedef struct {
+  uint32_t *colors_;  // color entries
+  int hash_shift_;    // Hash shift: 32 - hash_bits_.
+  int hash_bits_;
+} VP8LColorCache;
+
+static const uint64_t kHashMul = 0x1e35a7bdull;
+
+static WEBP_INLINE int HashPix(uint32_t argb, int shift) {
+  return (int)(((argb * kHashMul) & 0xffffffffu) >> shift);
+}
+
+static WEBP_INLINE uint32_t VP8LColorCacheLookup(
+    const VP8LColorCache* const cc, uint32_t key) {
+  assert((key >> cc->hash_bits_) == 0u);
+  return cc->colors_[key];
+}
+
+static WEBP_INLINE void VP8LColorCacheSet(const VP8LColorCache* const cc,
+                                          uint32_t key, uint32_t argb) {
+  assert((key >> cc->hash_bits_) == 0u);
+  cc->colors_[key] = argb;
+}
+
+static WEBP_INLINE void VP8LColorCacheInsert(const VP8LColorCache* const cc,
+                                             uint32_t argb) {
+  const int key = HashPix(argb, cc->hash_shift_);
+  cc->colors_[key] = argb;
+}
+
+static WEBP_INLINE int VP8LColorCacheGetIndex(const VP8LColorCache* const cc,
+                                              uint32_t argb) {
+  return HashPix(argb, cc->hash_shift_);
+}
+
+// Return the key if cc contains argb, and -1 otherwise.
+static WEBP_INLINE int VP8LColorCacheContains(const VP8LColorCache* const cc,
+                                              uint32_t argb) {
+  const int key = HashPix(argb, cc->hash_shift_);
+  return (cc->colors_[key] == argb) ? key : -1;
+}
+
+//------------------------------------------------------------------------------
+
+// Initializes the color cache with 'hash_bits' bits for the keys.
+// Returns false in case of memory error.
+int VP8LColorCacheInit(VP8LColorCache* const color_cache, int hash_bits);
+
+void VP8LColorCacheCopy(const VP8LColorCache* const src,
+                        VP8LColorCache* const dst);
+
+// Delete the memory associated to color cache.
+void VP8LColorCacheClear(VP8LColorCache* const color_cache);
+
+//------------------------------------------------------------------------------
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // WEBP_UTILS_COLOR_CACHE_H_