add shell for libwebpextras

meant to contain additional utility functions useful in processing webp
input/output.

Change-Id: I014ae6b917d62e826aa23a3bbe99aac4462a97c2

src/extras/Makefile.am

@@ -0,0 +1,13 @@
+lib_LTLIBRARIES = libwebpextras.la
+
+libwebpextras_la_SOURCES =
+libwebpextras_la_SOURCES += extras.c
+
+libwebpextrasinclude_HEADERS =
+libwebpextrasinclude_HEADERS += ../webp/extras.h
+libwebpextrasinclude_HEADERS += ../webp/types.h
+
+libwebpextras_la_LIBADD = ../libwebp.la
+libwebpextras_la_LDFLAGS = -no-undefined -version-info 0:0:0
+libwebpextrasincludedir = $(includedir)/webp
+pkgconfig_DATA = libwebpextras.pc

src/extras/extras.c

@@ -0,0 +1,23 @@
+// Copyright 2015 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.
+// -----------------------------------------------------------------------------
+//
+//  Additional WebP utilities.
+//
+
+#include "../webp/extras.h"
+
+#define XTRA_MAJ_VERSION 0
+#define XTRA_MIN_VERSION 0
+#define XTRA_REV_VERSION 0
+
+//------------------------------------------------------------------------------
+
+int WebPGetExtrasVersion(void) {
+  return (XTRA_MAJ_VERSION << 16) | (XTRA_MIN_VERSION << 8) | XTRA_REV_VERSION;
+}

src/extras/libwebpextras.pc.in

@@ -0,0 +1,11 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@
+
+Name: libwebpextras
+Description: Additional utility functions useful in processing WebP files
+Version: @PACKAGE_VERSION@
+Requires: libwebp >= 0.5.0
+Cflags: -I${includedir}
+Libs: -L${libdir} -lwebpextras