// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package org.chromium.android_webview;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Picture;
import android.util.LruCache;
import org.chromium.base.CalledByNative;
import org.chromium.base.JNINamespace;
/**
* Provides auxiliary methods related to Picture objects and native SkPictures.
*/
@JNINamespace("android_webview")
public class JavaBrowserViewRendererHelper {
private static final String LOGTAG = "JavaBrowserViewRendererHelper";
// Until the full HW path is ready, we limit to 5 AwContents on the screen at once.
private static LruCache<Long, Bitmap> sBitmapCache = new LruCache<Long, Bitmap>(5);
/**
* Provides a Bitmap object with a given width and height used for auxiliary rasterization.
* |canvas| is optional and if supplied indicates the Canvas that this Bitmap will be
* drawn into. Note the Canvas will not be modified in any way. If |ownerKey| is non-zero
* the Bitmap will be cached in sBitmapCache for future use.
*/
@CalledByNative
private static Bitmap createBitmap(int width, int height, Canvas canvas, long ownerKey) {
if (canvas != null) {
// When drawing into a Canvas, there is a maximum size imposed
// on Bitmaps that can be drawn. Respect that limit.
width = Math.min(width, canvas.getMaximumBitmapWidth());
height = Math.min(height, canvas.getMaximumBitmapHeight());
}
Bitmap bitmap = sBitmapCache.get(ownerKey);
if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) {
try {
bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
} catch (OutOfMemoryError e) {
android.util.Log.w(LOGTAG, "Error allocating bitmap");
return null;
}
if (ownerKey != 0) {
if (sBitmapCache.size() > AwContents.getNativeInstanceCount()) {
sBitmapCache.evictAll();
}
sBitmapCache.put(ownerKey, bitmap);
}
}
return bitmap;
}
/**
* Draws a provided bitmap into a canvas.
* Used for convenience from the native side and other static helper methods.
*/
@CalledByNative
private static void drawBitmapIntoCanvas(Bitmap bitmap, Canvas canvas, int x, int y) {
canvas.drawBitmap(bitmap, x, y, null);
}
/**
* Creates a new Picture that records drawing a provided bitmap.
* Will return an empty Picture if the Bitmap is null.
*/
@CalledByNative
private static Picture recordBitmapIntoPicture(Bitmap bitmap) {
Picture picture = new Picture();
if (bitmap != null) {
Canvas recordingCanvas = picture.beginRecording(bitmap.getWidth(), bitmap.getHeight());
drawBitmapIntoCanvas(bitmap, recordingCanvas, 0, 0);
picture.endRecording();
}
return picture;
}
// Should never be instantiated.
private JavaBrowserViewRendererHelper() {
}
}