Add regression test for PaintFlagsDrawFilter.
Test verifying that I269cbd7a624e5dde5688305e1ba97075ba73f4fd
fixed PaintFlagsDrawFilter using Paint.FILTER_BITMAP_FLAG.
BUG:15112859
Change-Id: Iec9a700d09aa360754ae9b3705750273910440f6
diff --git a/tests/tests/graphics/src/android/graphics/cts/PaintFlagsDrawFilterTest.java b/tests/tests/graphics/src/android/graphics/cts/PaintFlagsDrawFilterTest.java
index 31dbf16..ee3ec7c 100644
--- a/tests/tests/graphics/src/android/graphics/cts/PaintFlagsDrawFilterTest.java
+++ b/tests/tests/graphics/src/android/graphics/cts/PaintFlagsDrawFilterTest.java
@@ -107,4 +107,82 @@
// underline is under the text or at least at the bottom of it
assertTrue(rect.top >= TEXT_Y);
}
+
+ // Tests that FILTER_BITMAP_FLAG is handled properly.
+ public void testPaintFlagsDrawFilter2() {
+ // Create a bitmap with alternating black and white pixels.
+ int kWidth = 5;
+ int kHeight = 5;
+ int colors[] = new int [] { Color.WHITE, Color.BLACK };
+ int k = 0;
+ Bitmap grid = Bitmap.createBitmap(kWidth, kHeight, Config.ARGB_8888);
+ for (int i = 0; i < kWidth; ++i) {
+ for (int j = 0; j < kHeight; ++j) {
+ grid.setPixel(i, j, colors[k]);
+ k = (k + 1) % 2;
+ }
+ }
+
+ // Setup a scaled canvas for drawing the bitmap, with and without FILTER_BITMAP_FLAG set.
+ // When the flag is set, there will be gray pixels. When the flag is not set, all pixels
+ // will be either black or white.
+ int kScale = 5;
+ Bitmap dst = Bitmap.createBitmap(kWidth * kScale, kHeight * kScale, Config.ARGB_8888);
+ Canvas canvas = new Canvas(dst);
+ canvas.scale(kScale, kScale);
+
+ // Drawn without FILTER_BITMAP_FLAG, all pixels will be black or white.
+ Paint simplePaint = new Paint();
+ canvas.drawBitmap(grid, 0, 0, simplePaint);
+
+ assertContainsOnlyBlackAndWhite(dst);
+
+ // Drawn with FILTER_BITMAP_FLAG, some pixels will be somewhere in between.
+ Paint filterBitmapPaint = new Paint(Paint.FILTER_BITMAP_FLAG);
+ canvas.drawBitmap(grid, 0, 0, filterBitmapPaint);
+
+ assertContainsNonBW(dst);
+
+ // Drawing with a paint that FILTER_BITMAP_FLAG set and a DrawFilter that removes
+ // FILTER_BITMAP_FLAG should remove the effect of the flag, resulting in all pixels being
+ // either black or white.
+ canvas.setDrawFilter(new PaintFlagsDrawFilter(Paint.FILTER_BITMAP_FLAG, 0));
+ canvas.drawBitmap(grid, 0, 0, filterBitmapPaint);
+
+ assertContainsOnlyBlackAndWhite(dst);
+
+ // Likewise, drawing with a DrawFilter that sets FILTER_BITMAP_FLAG should filter,
+ // resulting in gray pixels.
+ canvas.setDrawFilter(new PaintFlagsDrawFilter(0, Paint.FILTER_BITMAP_FLAG));
+ canvas.drawBitmap(grid, 0, 0, simplePaint);
+
+ assertContainsNonBW(dst);
+ }
+
+ // Assert that at least one pixel is neither black nor white. This is used to verify that
+ // filtering was done, since the original bitmap only contained black and white pixels.
+ private void assertContainsNonBW(Bitmap bitmap) {
+ for (int i = 0; i < bitmap.getWidth(); ++i) {
+ for (int j = 0; j < bitmap.getHeight(); ++j) {
+ int color = bitmap.getPixel(i, j);
+ if (color != Color.BLACK && color != Color.WHITE) {
+ // Filtering must have been done.
+ return;
+ }
+ }
+ }
+ // Filtering did not happen.
+ assertTrue(false);
+ }
+
+ // Assert that every pixel is either black or white. Used to verify that no filtering was
+ // done, since the original bitmap contained only black and white pixels.
+ private void assertContainsOnlyBlackAndWhite(Bitmap bitmap) {
+ for (int i = 0; i < bitmap.getWidth(); ++i) {
+ for (int j = 0; j < bitmap.getHeight(); ++j) {
+ int color = bitmap.getPixel(i, j);
+ assertTrue(color == Color.BLACK || color == Color.WHITE);
+ }
+ }
+ }
}