| // Copyright (c) 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.Color; |
| import android.graphics.Picture; |
| import android.util.Log; |
| import android.util.LruCache; |
| |
| import org.chromium.base.CalledByNative; |
| import org.chromium.base.JNINamespace; |
| import org.chromium.content.common.TraceEvent; |
| |
| /** |
| * 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<Integer, Bitmap> sBitmapCache = new LruCache<Integer, 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, int 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() { |
| } |
| } |