src/be/nikiroo/utils/android/ImageUtilsAndroid.java

   1 package be.nikiroo.utils.android;
   2
   3 import android.graphics.Bitmap;
   4 import android.graphics.Bitmap.Config;
   5 import android.graphics.BitmapFactory;
   6
   7 import java.io.File;
   8 import java.io.FileOutputStream;
   9 import java.io.IOException;
  10 import java.io.InputStream;
  11 import java.util.stream.Stream;
  12
  13 import javax.imageio.ImageIO;
  14
  15 import be.nikiroo.utils.Image;
  16 import be.nikiroo.utils.ImageUtils;
  17 import be.nikiroo.utils.StringUtils;
  18
  19 /**
  20  * This class offer some utilities based around images and uses the Android
  21  * framework.
  22  *
  23  * @author niki
  24  */
  25 public class ImageUtilsAndroid extends ImageUtils {
  26         @Override
  27         protected boolean check() {
  28                 // If we can get the class, it means we have access to it
  29                 Config.ALPHA_8;
  30                 return true;
  31         }
  32
  33         @Override
  34         public void saveAsImage(Image img, File target, String format)
  35                         throws IOException {
  36                 FileOutputStream fos = new FileOutputStream(target);
  37                 try {
  38                         Bitmap image = fromImage(img);
  39
  40                         boolean ok = false;
  41                         try {
  42                                 ok = image.compress(
  43                                                 Bitmap.CompressFormat.valueOf(format.toUpperCase()),
  44                                                 90, fos);
  45                         } catch (Exception e) {
  46                                 ok = false;
  47                         }
  48
  49                         // Some formats are not reliable
  50                         // Second change: PNG
  51                         if (!ok && !format.equals("png")) {
  52                                 ok = image.compress(Bitmap.CompressFormat.PNG, 90, fos);
  53                         }
  54
  55                         if (!ok) {
  56                                 throw new IOException(
  57                                                 "Cannot find a writer for this image and format: "
  58                                                                 + format);
  59                         }
  60                 } catch (IOException e) {
  61                         throw new IOException("Cannot write image to " + target, e);
  62                 } finally {
  63                         fos.close();
  64                 }
  65         }
  66
  67         /**
  68          * Convert the given {@link Image} into a {@link Bitmap} object.
  69          *
  70          * @param img
  71          *            the {@link Image}
  72          * @return the {@link Image} object
  73          * @throws IOException
  74          *             in case of IO error
  75          */
  76         static public Bitmap fromImage(Image img) throws IOException {
  77                 InputStream stream = img.newInputStream();
  78                 try {
  79                         Bitmap image = BitmapFactory.decodeStream(stream);
  80                         if (image == null) {
  81                                 String ssize = StringUtils.formatNumber(img.getSize());
  82                                 throw new IOException(
  83                                                 "Failed to convert input to image, size was: " + ssize);
  84                         }
  85                 } finally {
  86                         stream.close();
  87                 }
  88
  89                 return image;
  90         }
  91 }