Optimize 9patch rendering.

This change detects empty quads in 9patches and removes them from
the mesh to avoid unnecessary blending.

Change-Id: I4500566fb4cb6845d64dcb59b522c0be7a0ec704

1 files changed, 40 insertions, 0 deletions

diff --git a/libs/hwui/utils/Compare.h b/libs/hwui/utils/Compare.h
new file mode 100644
index 0000000..754b470
--- /dev/null
+++ b/libs/hwui/utils/Compare.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_UI_COMPARE_H
+#define ANDROID_UI_COMPARE_H
+
+#include <cmath>
+
+#define EPSILON 0.00001f
+
+#define almost(u, v) (fabs((u) - (v)) < EPSILON)
+
+/**
+ * Compare floats.
+ */
+#define compare(a) \
+    if (a < rhs.a) return true; \
+    if (almost(a, rhs.a))
+
+/**
+ * Compare integers.
+ */
+#define compareI(a) \
+    if (a < rhs.a) return true; \
+    if (a == rhs.a)
+
+#endif // ANDROID_UI_COMPARE_H