Displaying Bitmaps Efficiently Training - Fix inSampleSize selection

When computing inSampleSize, calculateInSampleSize() needs to compare
height/width ratios, rather than raw values.

Bug: 7951398
Change-Id: I207f9abc2aae4cc569b406bac237e221d8e64d1e

docs/html/training/displaying-bitmaps/load-bitmap.jd

@@ -110,12 +110,17 @@ public static int calculateInSampleSize(
     int inSampleSize = 1;
 
     if (height > reqHeight || width > reqWidth) {
-        if (width > height) {
+
-            inSampleSize = Math.round((float)height / (float)reqHeight);
+        // Calculate ratios of height and width to requested height and width
-        } else {
+        final int heightRatio = Math.round((float) height / (float) reqHeight);
-            inSampleSize = Math.round((float)width / (float)reqWidth);
+        final int widthRatio = Math.round((float) width / (float) reqWidth);
-        }
+
+        // Choose the smallest ratio as inSampleSize value, this will guarantee
+        // a final image with both dimensions larger than or equal to the
+        // requested height and width.
+        inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
     }
+
     return inSampleSize;
 }
 </pre>