Ensure sub-bitmaps have a non-zero width and height

When images have a width or height greater than zero but less than the sample size, then the sub-bitmap can have a zero width or height, which causes Bitmap.createBitmap() to crash. By ensuring a height of at least 1, we avoid those crashes.

Fatal Exception: java.lang.IllegalArgumentException
height must be > 0
android.graphics.Bitmap.checkWidthHeight (Bitmap.java:413)
android.graphics.Bitmap.createBitmap (Bitmap.java:732)
android.graphics.Bitmap.createBitmap (Bitmap.java:701)
com.google.android.apps.muzei.render.BitmapRegionLoader.decodeRegion (BitmapRegionLoader.kt:177)
com.google.android.apps.muzei.render.GLPicture.<init> (GLPicture.kt:157)
com.google.android.apps.muzei.render.GLPictureKt.toGLPicture (GLPicture.kt:32)
com.google.android.apps.muzei.render.MuzeiBlurRenderer$GLPictureSet.load$muzei_publicBeta (MuzeiBlurRenderer.kt:325)
com.google.android.apps.muzei.render.MuzeiBlurRenderer.setAndConsumeBitmapRegionLoader (MuzeiBlurRenderer.kt:266)

android-client-common/src/main/java/com/google/android/apps/muzei/render/BitmapRegionLoader.kt

@@ -174,10 +174,12 @@ private constructor(private val inputStream: InputStream, private val rotation:
         if (options.inBitmap != null &&
                 (tempRect.width() != unsampledInBitmapWidth || tempRect.height() != unsampledInBitmapHeight)) {
             // Need to extract the sub-bitmap
+            val subBitmapWidth = Math.max(1, tempRect.width() / sampleSize)
+            val subBitmapHeight = Math.max(1, tempRect.height() / sampleSize)
             val subBitmap = Bitmap.createBitmap(
                     bitmap, 0, 0,
-                    tempRect.width() / sampleSize,
-                    tempRect.height() / sampleSize)
+                    subBitmapWidth,
+                    subBitmapHeight)
             if (bitmap != options.inBitmap && bitmap != subBitmap) {
                 bitmap.recycle()
             }