Creating functions for uploading a mipmapped texture.

src/core/SkMipMap.cpp

Index: src/core/SkMipMap.cpp
diff --git a/src/core/SkMipMap.cpp b/src/core/SkMipMap.cpp
index 6e0aaed6973e174e0359d607e7305e299c3ed1cc..a01441369834e58bf9795f8eea0d61d62322f63c 100644
--- a/src/core/SkMipMap.cpp
+++ b/src/core/SkMipMap.cpp
@@ -351,3 +351,23 @@ bool SkMipMap::extractLevel(SkScalar scale, Level* levelPtr) const {
     }
     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;
+}