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/*
* Copyright (C) 2011 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.
*/
package android.view;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Rect;
/**
* An OpenGL ES 2.0 implementation of {@link HardwareLayer}. This
* implementation can be used a rendering target. It generates a
* {@link Canvas} that can be used to render into an FBO using OpenGL.
*/
class GLES20RenderLayer extends GLES20Layer {
private int mLayerWidth;
private int mLayerHeight;
private final GLES20Canvas mCanvas;
GLES20RenderLayer(int width, int height, boolean isOpaque) {
super(width, height, isOpaque);
int[] layerInfo = new int[2];
mLayer = GLES20Canvas.nCreateLayer(width, height, isOpaque, layerInfo);
if (mLayer != 0) {
mLayerWidth = layerInfo[0];
mLayerHeight = layerInfo[1];
mCanvas = new GLES20Canvas(mLayer, !isOpaque);
mFinalizer = new Finalizer(mLayer);
} else {
mCanvas = null;
mFinalizer = null;
}
}
@Override
boolean isValid() {
return mLayer != 0 && mLayerWidth > 0 && mLayerHeight > 0;
}
@Override
boolean resize(int width, int height) {
if (!isValid() || width <= 0 || height <= 0) return false;
mWidth = width;
mHeight = height;
if (width != mLayerWidth || height != mLayerHeight) {
int[] layerInfo = new int[2];
if (GLES20Canvas.nResizeLayer(mLayer, width, height, layerInfo)) {
mLayerWidth = layerInfo[0];
mLayerHeight = layerInfo[1];
} else {
// Failure: not enough GPU resources for requested size
mLayer = 0;
mLayerWidth = 0;
mLayerHeight = 0;
}
}
return isValid();
}
@Override
void setOpaque(boolean isOpaque) {
mOpaque = isOpaque;
GLES20Canvas.nSetOpaqueLayer(mLayer, isOpaque);
}
@Override
HardwareCanvas getCanvas() {
return mCanvas;
}
@Override
void end(Canvas currentCanvas) {
HardwareCanvas canvas = getCanvas();
if (canvas != null) {
canvas.onPostDraw();
}
if (currentCanvas instanceof GLES20Canvas) {
((GLES20Canvas) currentCanvas).resume();
}
}
@Override
HardwareCanvas start(Canvas currentCanvas) {
return start(currentCanvas, null);
}
@Override
HardwareCanvas start(Canvas currentCanvas, Rect dirty) {
if (currentCanvas instanceof GLES20Canvas) {
((GLES20Canvas) currentCanvas).interrupt();
}
HardwareCanvas canvas = getCanvas();
canvas.setViewport(mWidth, mHeight);
canvas.onPreDraw(dirty);
return canvas;
}
/**
* Ignored
*/
@Override
void setTransform(Matrix matrix) {
}
@Override
void redrawLater(DisplayList displayList, Rect dirtyRect) {
GLES20Canvas.nUpdateRenderLayer(mLayer, mCanvas.getRenderer(),
((GLES20DisplayList) displayList).getNativeDisplayList(),
dirtyRect.left, dirtyRect.top, dirtyRect.right, dirtyRect.bottom);
}
}
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