1 files changed, 61 insertions, 0 deletions
diff --git a/gfx/skia/skia/src/codec/SkPixmapUtils.h b/gfx/skia/skia/src/codec/SkPixmapUtils.h
new file mode 100644
index 0000000000..e438fbbe83
--- /dev/null
+++ b/gfx/skia/skia/src/codec/SkPixmapUtils.h
@@ -0,0 +1,61 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkPixmapUtils_DEFINED
+#define SkPixmapUtils_DEFINED
+
+#include "include/codec/SkEncodedOrigin.h"
+#include "include/core/SkImageInfo.h"
+#include "include/core/SkPixmap.h"
+#include "src/core/SkAutoPixmapStorage.h"
+
+class SkPixmapUtils {
+public:
+    /**
+     *  Copy the pixels in this pixmap into dst, applying the orientation transformations specified
+     *  by the flags. If the inputs are invalid, this returns false and no copy is made.
+     */
+    static bool Orient(const SkPixmap& dst, const SkPixmap& src, SkEncodedOrigin);
+
+    static SkImageInfo SwapWidthHeight(const SkImageInfo& info);
+
+    /**
+     *  Decode an image and then copy into dst, applying origin.
+     *
+     *  @param dst SkPixmap to write the final image, after
+     *      applying the origin.
+     *  @param origin SkEncodedOrigin to apply to the raw pixels.
+     *  @param decode Function for decoding into a pixmap without
+     *      applying the origin.
+     */
+
+    template <typename Fn>
+    static bool Orient(const SkPixmap& dst, SkEncodedOrigin origin, Fn&& decode) {
+        SkAutoPixmapStorage storage;
+        const SkPixmap* tmp = &dst;
+        if (origin != kTopLeft_SkEncodedOrigin) {
+            auto info = dst.info();
+            if (SkEncodedOriginSwapsWidthHeight(origin)) {
+                info = SwapWidthHeight(info);
+            }
+            if (!storage.tryAlloc(info)) {
+                return false;
+            }
+            tmp = &storage;
+        }
+        if (!decode(*tmp)) {
+            return false;
+        }
+        if (tmp != &dst) {
+            return Orient(dst, *tmp, origin);
+        }
+        return true;
+    }
+
+};
+
+#endif // SkPixmapUtils_DEFINED