Add test for ImageDecoder scale + crop
Bug: 141735646
Test: This
ImageDecoder had a bug where combining setTargetSize and setCrop did not
work properly. Test scaling and cropping to the bottom right. This
results in a translate in ImageDecoder's internal code, so this verifies
that it is done correctly.
Change-Id: I9ab9115ee4cbc74549f7b914d99b667c700199d5
diff --git a/tests/tests/graphics/src/android/graphics/cts/ImageDecoderTest.java b/tests/tests/graphics/src/android/graphics/cts/ImageDecoderTest.java
index 4591268..05dd8dd 100644
--- a/tests/tests/graphics/src/android/graphics/cts/ImageDecoderTest.java
+++ b/tests/tests/graphics/src/android/graphics/cts/ImageDecoderTest.java
@@ -1388,6 +1388,73 @@
}
}
+ @Test
+ public void testScaleAndCrop() {
+ class CropListener implements ImageDecoder.OnHeaderDecodedListener {
+ public boolean doCrop = true;
+ public Rect outScaledRect = null;
+ public Rect outCropRect = null;
+
+ @Override
+ public void onHeaderDecoded(ImageDecoder decoder, ImageDecoder.ImageInfo info,
+ ImageDecoder.Source src) {
+ // Use software for pixel comparison.
+ decoder.setAllocator(ImageDecoder.ALLOCATOR_SOFTWARE);
+
+ // Scale to a size that is not directly supported by sampling.
+ Size originalSize = info.getSize();
+ int scaledWidth = originalSize.getWidth() * 2 / 3;
+ int scaledHeight = originalSize.getHeight() * 2 / 3;
+ decoder.setTargetSize(scaledWidth, scaledHeight);
+
+ outScaledRect = new Rect(0, 0, scaledWidth, scaledHeight);
+
+ if (doCrop) {
+ outCropRect = new Rect(scaledWidth / 2, scaledHeight / 2,
+ scaledWidth, scaledHeight);
+ decoder.setCrop(outCropRect);
+ }
+ }
+ }
+ CropListener l = new CropListener();
+ ImageDecoder.Source src = mCreators[0].apply(R.drawable.png_test);
+
+ // Scale and crop in a single step.
+ Bitmap oneStepBm = null;
+ try {
+ oneStepBm = ImageDecoder.decodeBitmap(src, l);
+ } catch (IOException e) {
+ fail("Failed with exception " + e);
+ }
+ assertNotNull(oneStepBm);
+ assertNotNull(l.outCropRect);
+ assertEquals(l.outCropRect.width(), oneStepBm.getWidth());
+ assertEquals(l.outCropRect.height(), oneStepBm.getHeight());
+ Rect cropRect = new Rect(l.outCropRect);
+
+ assertNotNull(l.outScaledRect);
+ Rect scaledRect = new Rect(l.outScaledRect);
+
+ // Now just scale with ImageDecoder, and crop afterwards.
+ l.doCrop = false;
+ Bitmap twoStepBm = null;
+ try {
+ twoStepBm = ImageDecoder.decodeBitmap(src, l);
+ } catch (IOException e) {
+ fail("Failed with exception " + e);
+ }
+ assertNotNull(twoStepBm);
+ assertEquals(scaledRect.width(), twoStepBm.getWidth());
+ assertEquals(scaledRect.height(), twoStepBm.getHeight());
+
+ Bitmap cropped = Bitmap.createBitmap(twoStepBm, cropRect.left, cropRect.top,
+ cropRect.width(), cropRect.height());
+ assertNotNull(cropped);
+
+ // The two should look the same.
+ assertTrue(BitmapUtils.compareBitmaps(cropped, oneStepBm, .99));
+ }
+
@Test(expected = IllegalArgumentException.class)
public void testResizeZeroX() {
ImageDecoder.Source src = mCreators[0].apply(R.drawable.png_test);
