Creating functions for uploading a mipmapped texture.

include/core/SkMipMapLevel.h

+/*
+ * 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 SkMipMapLevel_DEFINED
+#define SkMipMapLevel_DEFINED
+
+#include "SkTypes.h"
+
+struct SkMipMapLevel {
+    SkMipMapLevel(const void* texelsOrOffset, size_t rowBytes, int width, int height);
+
+    SkMipMapLevel() = delete;
+    SkMipMapLevel(const SkMipMapLevel& rhs) = default;
+    SkMipMapLevel(SkMipMapLevel&& rhs); // not "= default" because of VS2013
+
+    SkMipMapLevel& operator =(const SkMipMapLevel& rhs) = default;
+    SkMipMapLevel& operator =(SkMipMapLevel&& rhs); // not "= default" because of VS2013
+
+    const void* fTexelsOrOffset;
+    size_t fRowBytes;
+    int fWidth;
+    int fHeight;
+};
+
+// Get the number of mipmap levels from the base image's dimensions.
+int SkMipMapLevelCount(int baseWidth, int baseHeight);
+
+#endif