| 1 | // Copyright (c) 2013 The Chromium Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | package org.chromium.android_webview; |
| 6 | |
| 7 | import android.graphics.Bitmap; |
| 8 | import android.graphics.Canvas; |
| 9 | import android.graphics.Color; |
| 10 | import android.graphics.Picture; |
| 11 | import android.util.Log; |
| 12 | import android.util.LruCache; |
| 13 | |
| 14 | import org.chromium.base.CalledByNative; |
| 15 | import org.chromium.base.JNINamespace; |
| 16 | import org.chromium.content.common.TraceEvent; |
| 17 | |
| 18 | /** |
| 19 | * Provides auxiliary methods related to Picture objects and native SkPictures. |
| 20 | */ |
| 21 | @JNINamespace("android_webview") |
| 22 | public class JavaBrowserViewRendererHelper { |
| 23 | private static final String LOGTAG = "JavaBrowserViewRendererHelper"; |
| 24 | |
| 25 | // Until the full HW path is ready, we limit to 5 AwContents on the screen at once. |
| 26 | private static LruCache<Integer, Bitmap> sBitmapCache = new LruCache<Integer, Bitmap>(5); |
| 27 | |
| 28 | /** |
| 29 | * Provides a Bitmap object with a given width and height used for auxiliary rasterization. |
| 30 | * |canvas| is optional and if supplied indicates the Canvas that this Bitmap will be |
| 31 | * drawn into. Note the Canvas will not be modified in any way. If |ownerKey| is non-zero |
| 32 | * the Bitmap will be cached in sBitmapCache for future use. |
| 33 | */ |
| 34 | @CalledByNative |
| 35 | private static Bitmap createBitmap(int width, int height, Canvas canvas, int ownerKey) { |
| 36 | if (canvas != null) { |
| 37 | // When drawing into a Canvas, there is a maximum size imposed |
| 38 | // on Bitmaps that can be drawn. Respect that limit. |
| 39 | width = Math.min(width, canvas.getMaximumBitmapWidth()); |
| 40 | height = Math.min(height, canvas.getMaximumBitmapHeight()); |
| 41 | } |
| 42 | Bitmap bitmap = sBitmapCache.get(ownerKey); |
| 43 | if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { |
| 44 | try { |
| 45 | bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); |
| 46 | } catch (OutOfMemoryError e) { |
| 47 | android.util.Log.w(LOGTAG, "Error allocating bitmap"); |
| 48 | return null; |
| 49 | } |
| 50 | if (ownerKey != 0) { |
| 51 | if (sBitmapCache.size() > AwContents.getNativeInstanceCount()) { |
| 52 | sBitmapCache.evictAll(); |
| 53 | } |
| 54 | sBitmapCache.put(ownerKey, bitmap); |
| 55 | } |
| 56 | } |
| 57 | return bitmap; |
| 58 | } |
| 59 | |
| 60 | /** |
| 61 | * Draws a provided bitmap into a canvas. |
| 62 | * Used for convenience from the native side and other static helper methods. |
| 63 | */ |
| 64 | @CalledByNative |
| 65 | private static void drawBitmapIntoCanvas(Bitmap bitmap, Canvas canvas, int x, int y) { |
| 66 | canvas.drawBitmap(bitmap, x, y, null); |
| 67 | } |
| 68 | |
| 69 | /** |
| 70 | * Creates a new Picture that records drawing a provided bitmap. |
| 71 | * Will return an empty Picture if the Bitmap is null. |
| 72 | */ |
| 73 | @CalledByNative |
| 74 | private static Picture recordBitmapIntoPicture(Bitmap bitmap) { |
| 75 | Picture picture = new Picture(); |
| 76 | if (bitmap != null) { |
| 77 | Canvas recordingCanvas = picture.beginRecording(bitmap.getWidth(), bitmap.getHeight()); |
| 78 | drawBitmapIntoCanvas(bitmap, recordingCanvas, 0, 0); |
| 79 | picture.endRecording(); |
| 80 | } |
| 81 | return picture; |
| 82 | } |
| 83 | |
| 84 | // Should never be instantiated. |
| 85 | private JavaBrowserViewRendererHelper() { |
| 86 | } |
| 87 | } |