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  5. javax.imageio.stream.ImageInputStream#seek ( )

javax.imageio.stream.ImageInputStream#seek ( )源码实例Demo

下面列出了javax.imageio.stream.ImageInputStream#seek ( ) 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。

源代码1 项目： jdk1.8-source-analysis   文件： JFIFMarkerSegment.java 
BufferedImage getThumbnail(ImageInputStream iis,
                           JPEGImageReader reader)
    throws IOException {
    iis.mark();
    iis.seek(streamPos);
    DataBufferByte buffer = new DataBufferByte(getLength());
    readByteBuffer(iis,
                   buffer.getData(),
                   reader,
                   1.0F,
                   0.0F);
    iis.reset();

    WritableRaster raster =
        Raster.createInterleavedRaster(buffer,
                                       thumbWidth,
                                       thumbHeight,
                                       thumbWidth*3,
                                       3,
                                       new int [] {0, 1, 2},
                                       null);
    ColorModel cm = new ComponentColorModel(JPEG.JCS.sRGB,
                                            false,
                                            false,
                                            ColorModel.OPAQUE,
                                            DataBuffer.TYPE_BYTE);
    return new BufferedImage(cm,
                             raster,
                             false,
                             null);
}
源代码2 项目： jdk1.8-source-analysis   文件： JFIFMarkerSegment.java 
BufferedImage getThumbnail(ImageInputStream iis,
                           JPEGImageReader reader)
    throws IOException {
    iis.mark();
    iis.seek(streamPos);
    // read the palette
    byte [] palette = new byte [PALETTE_SIZE];
    float palettePart = ((float) PALETTE_SIZE) / getLength();
    readByteBuffer(iis,
                   palette,
                   reader,
                   palettePart,
                   0.0F);
    DataBufferByte buffer = new DataBufferByte(thumbWidth*thumbHeight);
    readByteBuffer(iis,
                   buffer.getData(),
                   reader,
                   1.0F-palettePart,
                   palettePart);
    iis.read();
    iis.reset();

    IndexColorModel cm = new IndexColorModel(8,
                                             256,
                                             palette,
                                             0,
                                             false);
    SampleModel sm = cm.createCompatibleSampleModel(thumbWidth,
                                                    thumbHeight);
    WritableRaster raster =
        Raster.createWritableRaster(sm, buffer, null);
    return new BufferedImage(cm,
                             raster,
                             false,
                             null);
}
源代码3 项目： jdk8u-dev-jdk   文件： JFIFMarkerSegment.java 
BufferedImage getThumbnail(ImageInputStream iis,
                           JPEGImageReader reader)
    throws IOException {
    iis.mark();
    iis.seek(streamPos);
    JPEGImageReader thumbReader = new JPEGImageReader(null);
    thumbReader.setInput(iis);
    thumbReader.addIIOReadProgressListener
        (new ThumbnailReadListener(reader));
    BufferedImage ret = thumbReader.read(0, null);
    thumbReader.dispose();
    iis.reset();
    return ret;
}
源代码4 项目： dragonwell8_jdk   文件： JFIFMarkerSegment.java 
BufferedImage getThumbnail(ImageInputStream iis,
                           JPEGImageReader reader)
    throws IOException {
    iis.mark();
    iis.seek(streamPos);
    DataBufferByte buffer = new DataBufferByte(getLength());
    readByteBuffer(iis,
                   buffer.getData(),
                   reader,
                   1.0F,
                   0.0F);
    iis.reset();

    WritableRaster raster =
        Raster.createInterleavedRaster(buffer,
                                       thumbWidth,
                                       thumbHeight,
                                       thumbWidth*3,
                                       3,
                                       new int [] {0, 1, 2},
                                       null);
    ColorModel cm = new ComponentColorModel(JPEG.JCS.sRGB,
                                            false,
                                            false,
                                            ColorModel.OPAQUE,
                                            DataBuffer.TYPE_BYTE);
    return new BufferedImage(cm,
                             raster,
                             false,
                             null);
}
源代码5 项目： dragonwell8_jdk   文件： JFIFMarkerSegment.java 
BufferedImage getThumbnail(ImageInputStream iis,
                           JPEGImageReader reader)
    throws IOException {
    iis.mark();
    iis.seek(streamPos);
    // read the palette
    byte [] palette = new byte [PALETTE_SIZE];
    float palettePart = ((float) PALETTE_SIZE) / getLength();
    readByteBuffer(iis,
                   palette,
                   reader,
                   palettePart,
                   0.0F);
    DataBufferByte buffer = new DataBufferByte(thumbWidth*thumbHeight);
    readByteBuffer(iis,
                   buffer.getData(),
                   reader,
                   1.0F-palettePart,
                   palettePart);
    iis.read();
    iis.reset();

    IndexColorModel cm = new IndexColorModel(8,
                                             256,
                                             palette,
                                             0,
                                             false);
    SampleModel sm = cm.createCompatibleSampleModel(thumbWidth,
                                                    thumbHeight);
    WritableRaster raster =
        Raster.createWritableRaster(sm, buffer, null);
    return new BufferedImage(cm,
                             raster,
                             false,
                             null);
}
源代码6 项目： dragonwell8_jdk   文件： JFIFMarkerSegment.java 
BufferedImage getThumbnail(ImageInputStream iis,
                           JPEGImageReader reader)
    throws IOException {
    iis.mark();
    iis.seek(streamPos);
    JPEGImageReader thumbReader = new JPEGImageReader(null);
    thumbReader.setInput(iis);
    thumbReader.addIIOReadProgressListener
        (new ThumbnailReadListener(reader));
    BufferedImage ret = thumbReader.read(0, null);
    thumbReader.dispose();
    iis.reset();
    return ret;
}
源代码7 项目： jdk8u-jdk   文件： JFIFMarkerSegment.java 
BufferedImage getThumbnail(ImageInputStream iis,
                           JPEGImageReader reader)
    throws IOException {
    iis.mark();
    iis.seek(streamPos);
    // read the palette
    byte [] palette = new byte [PALETTE_SIZE];
    float palettePart = ((float) PALETTE_SIZE) / getLength();
    readByteBuffer(iis,
                   palette,
                   reader,
                   palettePart,
                   0.0F);
    DataBufferByte buffer = new DataBufferByte(thumbWidth*thumbHeight);
    readByteBuffer(iis,
                   buffer.getData(),
                   reader,
                   1.0F-palettePart,
                   palettePart);
    iis.read();
    iis.reset();

    IndexColorModel cm = new IndexColorModel(8,
                                             256,
                                             palette,
                                             0,
                                             false);
    SampleModel sm = cm.createCompatibleSampleModel(thumbWidth,
                                                    thumbHeight);
    WritableRaster raster =
        Raster.createWritableRaster(sm, buffer, null);
    return new BufferedImage(cm,
                             raster,
                             false,
                             null);
}
源代码8 项目： Bytecoder   文件： JFIFMarkerSegment.java 
BufferedImage getThumbnail(ImageInputStream iis,
                           JPEGImageReader reader)
    throws IOException {
    iis.mark();
    iis.seek(streamPos);
    // read the palette
    byte [] palette = new byte [PALETTE_SIZE];
    float palettePart = ((float) PALETTE_SIZE) / getLength();
    readByteBuffer(iis,
                   palette,
                   reader,
                   palettePart,
                   0.0F);
    DataBufferByte buffer = new DataBufferByte(thumbWidth*thumbHeight);
    readByteBuffer(iis,
                   buffer.getData(),
                   reader,
                   1.0F-palettePart,
                   palettePart);
    iis.read();
    iis.reset();

    IndexColorModel cm = new IndexColorModel(8,
                                             256,
                                             palette,
                                             0,
                                             false);
    SampleModel sm = cm.createCompatibleSampleModel(thumbWidth,
                                                    thumbHeight);
    WritableRaster raster =
        Raster.createWritableRaster(sm, buffer, null);
    return new BufferedImage(cm,
                             raster,
                             false,
                             null);
}
源代码9 项目： Bytecoder   文件： JFIFMarkerSegment.java 
BufferedImage getThumbnail(ImageInputStream iis,
                           JPEGImageReader reader)
    throws IOException {
    iis.mark();
    iis.seek(streamPos);
    JPEGImageReader thumbReader = new JPEGImageReader(null);
    thumbReader.setInput(iis);
    thumbReader.addIIOReadProgressListener
        (new ThumbnailReadListener(reader));
    BufferedImage ret = thumbReader.read(0, null);
    thumbReader.dispose();
    iis.reset();
    return ret;
}
源代码10 项目： jdk8u_jdk   文件： JFIFMarkerSegment.java 
BufferedImage getThumbnail(ImageInputStream iis,
                           JPEGImageReader reader)
    throws IOException {
    iis.mark();
    iis.seek(streamPos);
    JPEGImageReader thumbReader = new JPEGImageReader(null);
    thumbReader.setInput(iis);
    thumbReader.addIIOReadProgressListener
        (new ThumbnailReadListener(reader));
    BufferedImage ret = thumbReader.read(0, null);
    thumbReader.dispose();
    iis.reset();
    return ret;
}
源代码11 项目： jdk8u60   文件： JFIFMarkerSegment.java 
BufferedImage getThumbnail(ImageInputStream iis,
                           JPEGImageReader reader)
    throws IOException {
    iis.mark();
    iis.seek(streamPos);
    DataBufferByte buffer = new DataBufferByte(getLength());
    readByteBuffer(iis,
                   buffer.getData(),
                   reader,
                   1.0F,
                   0.0F);
    iis.reset();

    WritableRaster raster =
        Raster.createInterleavedRaster(buffer,
                                       thumbWidth,
                                       thumbHeight,
                                       thumbWidth*3,
                                       3,
                                       new int [] {0, 1, 2},
                                       null);
    ColorModel cm = new ComponentColorModel(JPEG.JCS.sRGB,
                                            false,
                                            false,
                                            ColorModel.OPAQUE,
                                            DataBuffer.TYPE_BYTE);
    return new BufferedImage(cm,
                             raster,
                             false,
                             null);
}
源代码12 项目： jdk8u60   文件： JFIFMarkerSegment.java 
BufferedImage getThumbnail(ImageInputStream iis,
                           JPEGImageReader reader)
    throws IOException {
    iis.mark();
    iis.seek(streamPos);
    // read the palette
    byte [] palette = new byte [PALETTE_SIZE];
    float palettePart = ((float) PALETTE_SIZE) / getLength();
    readByteBuffer(iis,
                   palette,
                   reader,
                   palettePart,
                   0.0F);
    DataBufferByte buffer = new DataBufferByte(thumbWidth*thumbHeight);
    readByteBuffer(iis,
                   buffer.getData(),
                   reader,
                   1.0F-palettePart,
                   palettePart);
    iis.read();
    iis.reset();

    IndexColorModel cm = new IndexColorModel(8,
                                             256,
                                             palette,
                                             0,
                                             false);
    SampleModel sm = cm.createCompatibleSampleModel(thumbWidth,
                                                    thumbHeight);
    WritableRaster raster =
        Raster.createWritableRaster(sm, buffer, null);
    return new BufferedImage(cm,
                             raster,
                             false,
                             null);
}
源代码13 项目： Bytecoder   文件： JFIFMarkerSegment.java 
BufferedImage getThumbnail(ImageInputStream iis,
                           JPEGImageReader reader)
    throws IOException {
    iis.mark();
    iis.seek(streamPos);
    DataBufferByte buffer = new DataBufferByte(getLength());
    readByteBuffer(iis,
                   buffer.getData(),
                   reader,
                   1.0F,
                   0.0F);
    iis.reset();

    WritableRaster raster =
        Raster.createInterleavedRaster(buffer,
                                       thumbWidth,
                                       thumbHeight,
                                       thumbWidth*3,
                                       3,
                                       new int [] {0, 1, 2},
                                       null);
    ColorModel cm = new ComponentColorModel(JPEG.JCS.sRGB,
                                            false,
                                            false,
                                            ColorModel.OPAQUE,
                                            DataBuffer.TYPE_BYTE);
    return new BufferedImage(cm,
                             raster,
                             false,
                             null);
}
源代码14 项目： openjdk-jdk9   文件： JFIFMarkerSegment.java 
BufferedImage getThumbnail(ImageInputStream iis,
                           JPEGImageReader reader)
    throws IOException {
    iis.mark();
    iis.seek(streamPos);
    DataBufferByte buffer = new DataBufferByte(getLength());
    readByteBuffer(iis,
                   buffer.getData(),
                   reader,
                   1.0F,
                   0.0F);
    iis.reset();

    WritableRaster raster =
        Raster.createInterleavedRaster(buffer,
                                       thumbWidth,
                                       thumbHeight,
                                       thumbWidth*3,
                                       3,
                                       new int [] {0, 1, 2},
                                       null);
    ColorModel cm = new ComponentColorModel(JPEG.JCS.sRGB,
                                            false,
                                            false,
                                            ColorModel.OPAQUE,
                                            DataBuffer.TYPE_BYTE);
    return new BufferedImage(cm,
                             raster,
                             false,
                             null);
}
源代码15 项目： jdk8u-jdk   文件： JFIFMarkerSegment.java 
BufferedImage getThumbnail(ImageInputStream iis,
                           JPEGImageReader reader)
    throws IOException {
    iis.mark();
    iis.seek(streamPos);
    JPEGImageReader thumbReader = new JPEGImageReader(null);
    thumbReader.setInput(iis);
    thumbReader.addIIOReadProgressListener
        (new ThumbnailReadListener(reader));
    BufferedImage ret = thumbReader.read(0, null);
    thumbReader.dispose();
    iis.reset();
    return ret;
}
源代码16 项目： openjdk-8   文件： JFIFMarkerSegment.java 
BufferedImage getThumbnail(ImageInputStream iis,
                           JPEGImageReader reader)
    throws IOException {
    iis.mark();
    iis.seek(streamPos);
    // read the palette
    byte [] palette = new byte [PALETTE_SIZE];
    float palettePart = ((float) PALETTE_SIZE) / getLength();
    readByteBuffer(iis,
                   palette,
                   reader,
                   palettePart,
                   0.0F);
    DataBufferByte buffer = new DataBufferByte(thumbWidth*thumbHeight);
    readByteBuffer(iis,
                   buffer.getData(),
                   reader,
                   1.0F-palettePart,
                   palettePart);
    iis.read();
    iis.reset();

    IndexColorModel cm = new IndexColorModel(8,
                                             256,
                                             palette,
                                             0,
                                             false);
    SampleModel sm = cm.createCompatibleSampleModel(thumbWidth,
                                                    thumbHeight);
    WritableRaster raster =
        Raster.createWritableRaster(sm, buffer, null);
    return new BufferedImage(cm,
                             raster,
                             false,
                             null);
}
源代码17 项目： openjdk-jdk8u-backup   文件： JFIFMarkerSegment.java 
BufferedImage getThumbnail(ImageInputStream iis,
                           JPEGImageReader reader)
    throws IOException {
    iis.mark();
    iis.seek(streamPos);
    // read the palette
    byte [] palette = new byte [PALETTE_SIZE];
    float palettePart = ((float) PALETTE_SIZE) / getLength();
    readByteBuffer(iis,
                   palette,
                   reader,
                   palettePart,
                   0.0F);
    DataBufferByte buffer = new DataBufferByte(thumbWidth*thumbHeight);
    readByteBuffer(iis,
                   buffer.getData(),
                   reader,
                   1.0F-palettePart,
                   palettePart);
    iis.read();
    iis.reset();

    IndexColorModel cm = new IndexColorModel(8,
                                             256,
                                             palette,
                                             0,
                                             false);
    SampleModel sm = cm.createCompatibleSampleModel(thumbWidth,
                                                    thumbHeight);
    WritableRaster raster =
        Raster.createWritableRaster(sm, buffer, null);
    return new BufferedImage(cm,
                             raster,
                             false,
                             null);
}
源代码18 项目： jdk8u-dev-jdk   文件： JFIFMarkerSegment.java 
BufferedImage getThumbnail(ImageInputStream iis,
                           JPEGImageReader reader)
    throws IOException {
    iis.mark();
    iis.seek(streamPos);
    // read the palette
    byte [] palette = new byte [PALETTE_SIZE];
    float palettePart = ((float) PALETTE_SIZE) / getLength();
    readByteBuffer(iis,
                   palette,
                   reader,
                   palettePart,
                   0.0F);
    DataBufferByte buffer = new DataBufferByte(thumbWidth*thumbHeight);
    readByteBuffer(iis,
                   buffer.getData(),
                   reader,
                   1.0F-palettePart,
                   palettePart);
    iis.read();
    iis.reset();

    IndexColorModel cm = new IndexColorModel(8,
                                             256,
                                             palette,
                                             0,
                                             false);
    SampleModel sm = cm.createCompatibleSampleModel(thumbWidth,
                                                    thumbHeight);
    WritableRaster raster =
        Raster.createWritableRaster(sm, buffer, null);
    return new BufferedImage(cm,
                             raster,
                             false,
                             null);
}
源代码19 项目： webp-imageio   文件： WebPReader.java 
private void readData() throws IOException {
  if ( fData != null ) {
    return;
  }

  ImageInputStream input = ( ImageInputStream ) getInput();
  long length = input.length();
  if ( length > Integer.MAX_VALUE ) {
    throw new IOException( "Cannot read image of size " + length );
  }

  if ( input.getStreamPosition() != 0L ) {
    if ( isSeekForwardOnly() ) {
      throw new IOException();
    }
    else {
      input.seek( 0 );
    }
  }

  byte[] data;
  if ( length > 0 ) {
    data = new byte[ ( int ) length ];
    input.readFully( data );
  }
  else {
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    byte[] buffer = new byte[ 4096 ];
    int bytesRead;
    while ( ( bytesRead = input.read( buffer ) ) != -1 ) {
      out.write( buffer, 0, bytesRead );
    }
    out.close();
    data = out.toByteArray();
  }
  fData = data;
}
源代码20 项目： gcs   文件： DCTFilter.java 
private int getAdobeTransformByBruteForce(ImageInputStream iis) throws IOException
{
    int a = 0;
    iis.seek(0);
    int by;
    while ((by = iis.read()) != -1)
    {
        if (ADOBE.charAt(a) == by)
        {
            ++a;
            if (a != ADOBE.length())
            {
                continue;
            }
            // match
            a = 0;
            long afterAdobePos = iis.getStreamPosition();
            iis.seek(iis.getStreamPosition() - 9);
            int tag = iis.readUnsignedShort();
            if (tag != 0xFFEE)
            {
                iis.seek(afterAdobePos);
                continue;
            }
            int len = iis.readUnsignedShort();
            if (len >= POS_TRANSFORM + 1)
            {
                byte[] app14 = new byte[Math.max(len, POS_TRANSFORM + 1)];
                if (iis.read(app14) >= POS_TRANSFORM + 1)
                {
                    return app14[POS_TRANSFORM];
                }
            }
        }
        else
        {
            a = 0;
        }
    }
    return 0;
}
 方法所在类
javax.imageio.stream.ImageInputStream
 同类方法
close ( )
mark ( )
reset ( )
readFully ( )
seek ( )
read ( )
getStreamPosition ( )
readInt ( )
readByte ( )
length ( )
setByteOrder ( )
readBits ( )
getByteOrder ( )
readUnsignedInt ( )