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, 28 insertions, 32 deletions

diff --git a/src/3rdparty/libwebp/src/utils/utils.h b/src/3rdparty/libwebp/src/utils/utils.h
index e0a8112..3ab4590 100644
--- a/src/3rdparty/libwebp/src/utils/utils.h
+++ b/src/3rdparty/libwebp/src/utils/utils.h
@@ -20,6 +20,7 @@
 #endif
 
 #include <assert.h>
+#include <limits.h>
 
 #include "../dsp/dsp.h"
 #include "../webp/types.h"
@@ -32,7 +33,14 @@ extern "C" {
 // Memory allocation
 
 // This is the maximum memory amount that libwebp will ever try to allocate.
-#define WEBP_MAX_ALLOCABLE_MEMORY (1ULL << 40)
+#ifndef WEBP_MAX_ALLOCABLE_MEMORY
+#if SIZE_MAX > (1ULL << 34)
+#define WEBP_MAX_ALLOCABLE_MEMORY (1ULL << 34)
+#else
+// For 32-bit targets keep this below INT_MAX to avoid valgrind warnings.
+#define WEBP_MAX_ALLOCABLE_MEMORY ((1ULL << 31) - (1 << 16))
+#endif
+#endif  // WEBP_MAX_ALLOCABLE_MEMORY
 
 // size-checking safe malloc/calloc: verify that the requested size is not too
 // large, or return NULL. You don't need to call these for constructs like
@@ -54,7 +62,6 @@ WEBP_EXTERN(void) WebPSafeFree(void* const ptr);
 #define WEBP_ALIGN_CST 31
 #define WEBP_ALIGN(PTR) (((uintptr_t)(PTR) + WEBP_ALIGN_CST) & ~WEBP_ALIGN_CST)
 
-#if defined(WEBP_FORCE_ALIGNED)
 #include <string.h>
 // memcpy() is the safe way of moving potentially unaligned 32b memory.
 static WEBP_INLINE uint32_t WebPMemToUint32(const uint8_t* const ptr) {
@@ -65,16 +72,6 @@ static WEBP_INLINE uint32_t WebPMemToUint32(const uint8_t* const ptr) {
 static WEBP_INLINE void WebPUint32ToMem(uint8_t* const ptr, uint32_t val) {
   memcpy(ptr, &val, sizeof(val));
 }
-#else
-static WEBP_UBSAN_IGNORE_UNDEF WEBP_INLINE
-uint32_t WebPMemToUint32(const uint8_t* const ptr) {
-  return *(const uint32_t*)ptr;
-}
-static WEBP_UBSAN_IGNORE_UNDEF WEBP_INLINE
-void WebPUint32ToMem(uint8_t* const ptr, uint32_t val) {
-  *(uint32_t*)ptr = val;
-}
-#endif
 
 //------------------------------------------------------------------------------
 // Reading/writing data.
@@ -110,6 +107,19 @@ static WEBP_INLINE void PutLE32(uint8_t* const data, uint32_t val) {
   PutLE16(data + 2, (int)(val >> 16));
 }
 
+// Returns 31 ^ clz(n) = log2(n). This is the default C-implementation, either
+// based on table or not. Can be used as fallback if clz() is not available.
+#define WEBP_NEED_LOG_TABLE_8BIT
+extern const uint8_t WebPLogTable8bit[256];
+static WEBP_INLINE int WebPLog2FloorC(uint32_t n) {
+  int log = 0;
+  while (n >= 256) {
+    log += 8;
+    n >>= 8;
+  }
+  return log + WebPLogTable8bit[n];
+}
+
 // Returns (int)floor(log2(n)). n must be > 0.
 // use GNU builtins where available.
 #if defined(__GNUC__) && \
@@ -127,22 +137,8 @@ static WEBP_INLINE int BitsLog2Floor(uint32_t n) {
   _BitScanReverse(&first_set_bit, n);
   return first_set_bit;
 }
-#else
-static WEBP_INLINE int BitsLog2Floor(uint32_t n) {
-  int log = 0;
-  uint32_t value = n;
-  int i;
-
-  for (i = 4; i >= 0; --i) {
-    const int shift = (1 << i);
-    const uint32_t x = value >> shift;
-    if (x != 0) {
-      value = x;
-      log += shift;
-    }
-  }
-  return log;
-}
+#else   // default: use the C-version.
+static WEBP_INLINE int BitsLog2Floor(uint32_t n) { return WebPLog2FloorC(n); }
 #endif
 
 //------------------------------------------------------------------------------
@@ -164,12 +160,12 @@ WEBP_EXTERN(void) WebPCopyPixels(const struct WebPPicture* const src,
 // Unique colors.
 
 // Returns count of unique colors in 'pic', assuming pic->use_argb is true.
-// If the unique color count is more than MAX_COLOR_COUNT, returns
-// MAX_COLOR_COUNT+1.
+// If the unique color count is more than MAX_PALETTE_SIZE, returns
+// MAX_PALETTE_SIZE+1.
 // If 'palette' is not NULL and number of unique colors is less than or equal to
-// MAX_COLOR_COUNT, also outputs the actual unique colors into 'palette'.
+// MAX_PALETTE_SIZE, also outputs the actual unique colors into 'palette'.
 // Note: 'palette' is assumed to be an array already allocated with at least
-// MAX_COLOR_COUNT elements.
+// MAX_PALETTE_SIZE elements.
 WEBP_EXTERN(int) WebPGetColorPalette(const struct WebPPicture* const pic,
                                      uint32_t* const palette);