| // 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 org.chromium.base.annotations.CalledByNative; |
| import org.chromium.base.annotations.JNINamespace; |
| |
| /** |
| * Provides auxiliary methods related to Picture objects and native SkPictures. |
| */ |
| @JNINamespace("android_webview") |
| public class JavaBrowserViewRendererHelper { |
| private static final String LOGTAG = "JavaBrowserViewRendererHelper"; |
| |
| /** |
| * 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. |
| */ |
| @CalledByNative |
| private static Bitmap createBitmap(int width, int height, Canvas canvas) { |
| 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 = null; |
| try { |
| bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); |
| } catch (OutOfMemoryError e) { |
| android.util.Log.w(LOGTAG, "Error allocating 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 scrollX, int scrollY) { |
| canvas.translate(scrollX, scrollY); |
| canvas.drawBitmap(bitmap, 0, 0, null); |
| } |
| |
| // Should never be instantiated. |
| private JavaBrowserViewRendererHelper() { |
| } |
| } |