Bundled libwebp updated to version 0.5.1

This commit imports libwebp 0.5.1, including AUTHORS, COPYING, ChangeLog,
NEWS, PATENTS, README and src directories. In src, only includes header
and source files.

Upstream changes since 0.5.0 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: I7d0c15400154c3b4ee8ff37665303307c4b84f9f
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>

1 files changed, 13 insertions, 8 deletions

diff --git a/src/3rdparty/libwebp/src/webp/decode.h b/src/3rdparty/libwebp/src/webp/decode.h
index 143e4fb..7a3bed9 100644
--- a/src/3rdparty/libwebp/src/webp/decode.h
+++ b/src/3rdparty/libwebp/src/webp/decode.h
@@ -39,8 +39,8 @@ typedef struct WebPDecoderConfig WebPDecoderConfig;
 WEBP_EXTERN(int) WebPGetDecoderVersion(void);
 
 // Retrieve basic header information: width, height.
-// This function will also validate the header and return 0 in
-// case of formatting error.
+// This function will also validate the header, returning true on success,
+// false otherwise. '*width' and '*height' are only valid on successful return.
 // Pointers 'width' and 'height' can be passed NULL if deemed irrelevant.
 WEBP_EXTERN(int) WebPGetInfo(const uint8_t* data, size_t data_size,
                              int* width, int* height);
@@ -197,7 +197,10 @@ struct WebPYUVABuffer {              // view as YUVA
 struct WebPDecBuffer {
   WEBP_CSP_MODE colorspace;  // Colorspace.
   int width, height;         // Dimensions.
-  int is_external_memory;    // If true, 'internal_memory' pointer is not used.
+  int is_external_memory;    // If non-zero, 'internal_memory' pointer is not
+                             // used. If value is '2' or more, the external
+                             // memory is considered 'slow' and multiple
+                             // read/write will be avoided.
   union {
     WebPRGBABuffer RGBA;
     WebPYUVABuffer YUVA;
@@ -205,7 +208,7 @@ struct WebPDecBuffer {
   uint32_t       pad[4];     // padding for later use
 
   uint8_t* private_memory;   // Internally allocated memory (only when
-                             // is_external_memory is false). Should not be used
+                             // is_external_memory is 0). Should not be used
                              // externally, but accessed via the buffer union.
 };
 
@@ -269,7 +272,7 @@ typedef enum VP8StatusCode {
 // that of the returned WebPIDecoder object.
 // The supplied 'output_buffer' content MUST NOT be changed between calls to
 // WebPIAppend() or WebPIUpdate() unless 'output_buffer.is_external_memory' is
-// set to 1. In such a case, it is allowed to modify the pointers, size and
+// not set to 0. In such a case, it is allowed to modify the pointers, size and
 // stride of output_buffer.u.RGBA or output_buffer.u.YUVA, provided they remain
 // within valid bounds.
 // All other fields of WebPDecBuffer MUST remain constant between calls.
@@ -468,16 +471,18 @@ static WEBP_INLINE int WebPInitDecoderConfig(WebPDecoderConfig* config) {
 // parameter, in which case the features will be parsed and stored into
 // config->input. Otherwise, 'data' can be NULL and no parsing will occur.
 // Note that 'config' can be NULL too, in which case a default configuration
-// is used.
+// is used. If 'config' is not NULL, it must outlive the WebPIDecoder object
+// as some references to its fields will be used. No internal copy of 'config'
+// is made.
 // The return WebPIDecoder object must always be deleted calling WebPIDelete().
 // Returns NULL in case of error (and config->status will then reflect
-// the error condition).
+// the error condition, if available).
 WEBP_EXTERN(WebPIDecoder*) WebPIDecode(const uint8_t* data, size_t data_size,
                                        WebPDecoderConfig* config);
 
 // Non-incremental version. This version decodes the full data at once, taking
 // 'config' into account. Returns decoding status (which should be VP8_STATUS_OK
-// if the decoding was successful).
+// if the decoding was successful). Note that 'config' cannot be NULL.
 WEBP_EXTERN(VP8StatusCode) WebPDecode(const uint8_t* data, size_t data_size,
                                       WebPDecoderConfig* config);