android/source/src/java/org/mozilla/gecko/gfx/BufferedCairoImage.java

   1 /* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
   2  * This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 package org.mozilla.gecko.gfx;
   7
   8
   9 import android.graphics.Bitmap;
  10 import android.util.Log;
  11
  12 import org.libreoffice.kit.DirectBufferAllocator;
  13
  14 import java.nio.ByteBuffer;
  15
  16 /**
  17  * A Cairo image that simply saves a buffer of pixel data.
  18  */
  19 public class BufferedCairoImage extends CairoImage {
  20     private static String LOGTAG = "GeckoBufferedCairoImage";
  21     private ByteBuffer mBuffer;
  22     private IntSize mSize;
  23     private int mFormat;
  24
  25     /**
  26      * Creates a buffered Cairo image from a byte buffer.
  27      */
  28     public BufferedCairoImage(ByteBuffer inBuffer, int inWidth, int inHeight, int inFormat) {
  29         setBuffer(inBuffer, inWidth, inHeight, inFormat);
  30     }
  31
  32     /**
  33      * Creates a buffered Cairo image from an Android bitmap.
  34      */
  35     public BufferedCairoImage(Bitmap bitmap) {
  36         setBitmap(bitmap);
  37     }
  38
  39     private synchronized void freeBuffer() {
  40         mBuffer = DirectBufferAllocator.free(mBuffer);
  41     }
  42
  43     @Override
  44     public void destroy() {
  45         try {
  46             freeBuffer();
  47         } catch (Exception ex) {
  48             Log.e(LOGTAG, "error clearing buffer: ", ex);
  49         }
  50     }
  51
  52     @Override
  53     public ByteBuffer getBuffer() {
  54         return mBuffer;
  55     }
  56
  57     @Override
  58     public IntSize getSize() {
  59         return mSize;
  60     }
  61
  62     @Override
  63     public int getFormat() {
  64         return mFormat;
  65     }
  66
  67
  68     public void setBuffer(ByteBuffer buffer, int width, int height, int format) {
  69         freeBuffer();
  70         mBuffer = buffer;
  71         mSize = new IntSize(width, height);
  72         mFormat = format;
  73     }
  74
  75     public void setBitmap(Bitmap bitmap) {
  76         mFormat = CairoUtils.bitmapConfigToCairoFormat(bitmap.getConfig());
  77         mSize = new IntSize(bitmap.getWidth(), bitmap.getHeight());
  78
  79         int bpp = CairoUtils.bitsPerPixelForCairoFormat(mFormat) / 8;
  80         mBuffer = DirectBufferAllocator.allocate(mSize.getArea() * bpp);
  81         bitmap.copyPixelsToBuffer(mBuffer.asIntBuffer());
  82     }
  83 }