1 files changed, 64 insertions, 0 deletions
diff --git a/gfx/tests/gtest/TestTiledLayerBuffer.cpp b/gfx/tests/gtest/TestTiledLayerBuffer.cpp
new file mode 100644
index 000000000..c5e9b0f41
--- /dev/null
+++ b/gfx/tests/gtest/TestTiledLayerBuffer.cpp
@@ -0,0 +1,64 @@
+/* vim:set ts=2 sw=2 sts=2 et: */
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+#include "TiledLayerBuffer.h"
+
+#include "gtest/gtest.h"
+
+namespace mozilla {
+namespace layers {
+
+TEST(TiledLayerBuffer, TileStart) {
+  ASSERT_EQ(RoundDownToTileEdge(10, 256), 0);
+  ASSERT_EQ(RoundDownToTileEdge(-10, 256), -256);
+}
+
+TEST(TiledLayerBuffer, TilesPlacement) {
+  for (int firstY = -10; firstY < 10; ++firstY) {
+    for (int firstX = -10; firstX < 10; ++firstX) {
+      for (int height = 1; height < 10; ++height) {
+        for (int width = 1; width < 10; ++width) {
+
+          const TilesPlacement p1 = TilesPlacement(firstX, firstY, width, height);
+          // Check that HasTile returns false with some positions that we know
+          // not to be in the rectangle of the TilesPlacement.
+          ASSERT_FALSE(p1.HasTile(TileIntPoint(firstX - 1, 0)));
+          ASSERT_FALSE(p1.HasTile(TileIntPoint(0, firstY - 1)));
+          ASSERT_FALSE(p1.HasTile(TileIntPoint(firstX + width + 1,  0)));
+          ASSERT_FALSE(p1.HasTile(TileIntPoint(0, firstY + height + 1)));
+
+          // Verify that all positions within the rect that defines the
+          // TilesPlacement map to indices between 0 and width*height.
+          for (int y = firstY; y < (firstY+height); ++y) {
+            for (int x = firstX; x < (firstX+width); ++x) {
+              ASSERT_TRUE(p1.HasTile(TileIntPoint(x,y)));
+              ASSERT_TRUE(p1.TileIndex(TileIntPoint(x, y)) >= 0);
+              ASSERT_TRUE(p1.TileIndex(TileIntPoint(x, y)) < width * height);
+            }
+          }
+
+          // XXX - This causes some versions of gcc to warn that it optimizes
+          // away the test, which gets caught in -WError in PGO builds.
+          // The lazy thing to do is to just comment this out since this specific
+          // test isn't critically important, but we should remove the warning instead.
+          // cf. bug 1179287
+          //
+          // Verify that indices map to positions that are within the rect that
+          // defines the TilesPlacement.
+          // for (int i = 0; i < width * height; ++i) {
+          //   ASSERT_TRUE(p1.TilePosition(i).x >= firstX);
+          //   ASSERT_TRUE(p1.TilePosition(i).x < firstX + width);
+          //   ASSERT_TRUE(p1.TilePosition(i).y >= firstY);
+          //   ASSERT_TRUE(p1.TilePosition(i).y < firstY + height);
+          // }
+
+        }
+      }
+    }
+  }
+}
+
+}
+}