Add a layer (FBO) cache.
The cache is used to draw layers so that a new
texture does not have to be recreated every time
a call to saveLayer() happens.
The FBO cache used a KeyedVector, which is a bad
idea. The cache should be able to store several
FBOs of the same size (this happens a lot during
scrolling with fading edges for instance.) This
will be changed in a future CL.
Change-Id: Ic316189e625f0dbcf0d273a71cc981a433d48726
diff --git a/libs/hwui/Layer.h b/libs/hwui/Layer.h
new file mode 100644
index 0000000..70d64ca
--- /dev/null
+++ b/libs/hwui/Layer.h
@@ -0,0 +1,90 @@
+/*
+ * 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_LAYER_H
+#define ANDROID_UI_LAYER_H
+
+#include <GLES2/gl2.h>
+
+#include <SkXfermode.h>
+
+#include "Rect.h"
+
+namespace android {
+namespace uirenderer {
+
+/**
+ * Dimensions of a layer.
+ */
+struct LayerSize {
+ LayerSize(): width(0), height(0) { }
+ LayerSize(const uint32_t width, const uint32_t height): width(width), height(height) { }
+ LayerSize(const LayerSize& size): width(size.width), height(size.height) { }
+
+ uint32_t width;
+ uint32_t height;
+
+ bool operator<(const LayerSize& rhs) const {
+ if (width == rhs.width) {
+ return height < rhs.height;
+ }
+ return width < rhs.width;
+ }
+
+ bool operator==(const LayerSize& rhs) const {
+ return width == rhs.width && height == rhs.height;
+ }
+};
+
+/**
+ * A layer has dimensions and is backed by an OpenGL texture.
+ */
+struct Layer {
+ /**
+ * Coordinates of the layer corresponding to this snapshot.
+ * Only set when the flag kFlagIsLayer is set.
+ */
+ Rect layer;
+ /**
+ * Name of the texture used to render the layer.
+ * Only set when the flag kFlagIsLayer is set.
+ */
+ GLuint texture;
+ /**
+ * Name of the FBO used to render the layer.
+ * Only set when the flag kFlagIsLayer is set.
+ */
+ GLuint fbo;
+ /**
+ * Opacity of the layer.
+ * Only set when the flag kFlagIsLayer is set.
+ */
+ float alpha;
+ /**
+ * Blending mode of the layer.
+ * Only set when the flag kFlagIsLayer is set.
+ */
+ SkXfermode::Mode mode;
+ /**
+ * Indicates whether this layer should be blended.
+ */
+ bool blend;
+}; // struct Layer
+
+}; // namespace uirenderer
+}; // namespace android
+
+#endif // ANDROID_UI_LAYER_H