libwebp: update to v0.5.1

third_party/libwebp/utils/utils.h

Index: third_party/libwebp/utils/utils.h
diff --git a/third_party/libwebp/utils/utils.h b/third_party/libwebp/utils/utils.h
index f506d668722f13831a67d75d06733ddbb0ac1e5e..e0a81126df8e703b10cf529b2a89c610573c0b93 100644
--- a/third_party/libwebp/utils/utils.h
+++ b/third_party/libwebp/utils/utils.h
@@ -21,6 +21,7 @@
 
 #include <assert.h>
 
+#include "../dsp/dsp.h"
 #include "../webp/types.h"
 
 #ifdef __cplusplus
@@ -51,7 +52,7 @@ WEBP_EXTERN(void) WebPSafeFree(void* const ptr);
 // Alignment
 
 #define WEBP_ALIGN_CST 31
-#define WEBP_ALIGN(PTR) ((uintptr_t)((PTR) + WEBP_ALIGN_CST) & ~WEBP_ALIGN_CST)
+#define WEBP_ALIGN(PTR) (((uintptr_t)(PTR) + WEBP_ALIGN_CST) & ~WEBP_ALIGN_CST)
 
 #if defined(WEBP_FORCE_ALIGNED)
 #include <string.h>
@@ -65,10 +66,12 @@ static WEBP_INLINE void WebPUint32ToMem(uint8_t* const ptr, uint32_t val) {
   memcpy(ptr, &val, sizeof(val));
 }
 #else
-static WEBP_INLINE uint32_t WebPMemToUint32(const uint8_t* const ptr) {
+static WEBP_UBSAN_IGNORE_UNDEF WEBP_INLINE
+uint32_t WebPMemToUint32(const uint8_t* const ptr) {
   return *(const uint32_t*)ptr;
 }
-static WEBP_INLINE void WebPUint32ToMem(uint8_t* const ptr, uint32_t val) {
+static WEBP_UBSAN_IGNORE_UNDEF WEBP_INLINE
+void WebPUint32ToMem(uint8_t* const ptr, uint32_t val) {
   *(uint32_t*)ptr = val;
 }
 #endif
@@ -158,6 +161,19 @@ WEBP_EXTERN(void) WebPCopyPixels(const struct WebPPicture* const src,
                                  struct WebPPicture* const dst);
 
 //------------------------------------------------------------------------------
+// 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 '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'.
+// Note: 'palette' is assumed to be an array already allocated with at least
+// MAX_COLOR_COUNT elements.
+WEBP_EXTERN(int) WebPGetColorPalette(const struct WebPPicture* const pic,
+                                     uint32_t* const palette);
+
+//------------------------------------------------------------------------------
 
 #ifdef __cplusplus
 }    // extern "C"