Fix repeat behaviours (microsoft#2957)

source/android/adaptivecards/src/main/java/io/adaptivecards/renderer/BackgroundImageLoaderAsync.java

@@ -44,8 +44,6 @@ protected HttpRequestResult<Bitmap> doInBackground(String... args)
 
  void onSuccessfulPostExecute(Bitmap bitmap)
  {
- int originalWidth = m_layout.getWidth();
- int originalHeight = m_layout.getHeight();
  BitmapDrawable background = new BackgroundImageDrawable(m_context.getResources(), bitmap, m_backgroundImageProperties);
  m_layout.setBackground(background);
  m_layout.bringChildToFront(m_layout.getChildAt(0));
@@ -71,8 +69,7 @@ public void draw(Canvas canvas)
  switch (m_backgroundImageProperties.GetFillMode())
  {
  case Repeat:
- setTileModeXY(Shader.TileMode.REPEAT, Shader.TileMode.REPEAT);
- super.draw(canvas);
+ tileHorizontallyAndVertically(canvas);
  break;
  case RepeatVertically:
  tileVertically(canvas);
@@ -185,7 +182,7 @@ private void tileHorizontally(Canvas canvas)
  int imageHeight = bitmap.getHeight();
  canvas.drawBitmap(bitmap,
  new Rect(0, 0, remainingWidth, imageHeight),
- new Rect(x, (int)verticalOffset, canvasWidth, imageHeight),
+ new Rect(x, (int)verticalOffset, canvasWidth, (int)verticalOffset + imageHeight),
  getPaint());
  }
  }
@@ -224,10 +221,44 @@ private void tileVertically(Canvas canvas)
  int imageWidth = bitmap.getWidth();
  canvas.drawBitmap(bitmap,
  new Rect(0, 0, imageWidth, remainingHeight),
- new Rect((int)horizontalOffset, y, imageWidth, canvasHeight),
+ new Rect((int)horizontalOffset, y, (int)horizontalOffset + imageWidth, canvasHeight),
  getPaint());
  }
  }
  }
+
+ private void tileHorizontallyAndVertically(Canvas canvas)
+ {
+ Bitmap bitmap = m_bitmap;
+
+ int imageHeight = bitmap.getHeight();
+ int imageWidth = bitmap.getWidth();
+ int canvasHeight = canvas.getHeight();
+ int canvasWidth = canvas.getWidth();
+ for (int y = 0; y < canvasHeight; y += imageHeight)
+ {
+ int remainingHeight = canvasHeight - y;
+ for (int x = 0; x < canvasWidth; x += imageWidth)
+ {
+ int remainingWidth = canvasWidth - x;
+ // If the image can be drawn completely, then do it
+ if (imageWidth <= remainingWidth && imageHeight <= remainingHeight)
+ {
+ canvas.drawBitmap(bitmap, x, y, getPaint());
+ }
+ else
+ {
+ // If the image can't be drawn completely, then draw as much of the image as possible
+ int drawableWidth = Math.min(remainingWidth, imageWidth);
+ int drawableHeight = Math.min(remainingHeight, imageHeight);
+
+ canvas.drawBitmap(bitmap,
+ new Rect(0, 0, drawableWidth, drawableHeight),
+ new Rect(x, y, x + drawableWidth, y + drawableHeight),
+ getPaint());
+ }
+ }
+ }
+ }
  }
 }