Creating functions for uploading a mipmapped texture.

src/core/SkMipMap.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkMipMap.h"
 #include "SkBitmap.h"
 #include "SkColorPriv.h"
@@ skipping 333 matching lines @@
     }
 
     if (level > fCount) {
         level = fCount;
     }
     if (levelPtr) {
         *levelPtr = fLevels[level - 1];
     }
     return true;
 }
+
+int SkMipMap::getLevelsCount() const {
+    return fCount;
+}
+
+bool SkMipMap::getLevel(int levelIndex, Level* levelPtr) const {
+    if (NULL == fLevels) {
+        return false;
+    }
+    if (levelIndex <= 0) {
+        return false;
+    }
+    if (levelIndex > fCount) {

[bsalomon, 2015/10/28 16:40:44]

Is there a caller that relies on this clamping behavior? Wondering if we can
just fail here.

[cblume, 2015/10/28 22:49:40]

There is no caller that relies on this. I was mimicking what I saw in
SkMipMap::extractLevel. But I like your idea of simply returning false.

+        levelIndex = fCount;
+    }
+    if (levelPtr) {
+        *levelPtr = fLevels[levelIndex - 1];
+    }
+    return true;
+}