Examples of javax.imageio.plugins.jpeg.JPEGImageReadParam

javax.imageio.plugins.jpeg.JPEGImageReadParam
This class adds the ability to set JPEG quantization and Huffman tables when using the built-in JPEG reader plug-in. An instance of this class will be returned from the getDefaultImageReadParam methods of the built-in JPEG ImageReader.
The sole purpose of these additions is to allow the specification of tables for use in decoding abbreviated streams. The built-in JPEG reader will also accept an ordinary ImageReadParam, which is sufficient for decoding non-abbreviated streams.
While tables for abbreviated streams are often obtained by first reading another abbreviated stream containing only the tables, in some applications the tables are fixed ahead of time. This class allows the tables to be specified directly from client code. If no tables are specified either in the stream or in a JPEGImageReadParam, then the stream is presumed to use the "standard" visually lossless tables. See {@link JPEGQTable JPEGQTable}and {@link JPEGHuffmanTable JPEGHuffmanTable} for more informationon the default tables.
The default JPEGImageReadParam returned by the getDefaultReadParam method of the builtin JPEG reader contains no tables. Default tables may be obtained from the table classes {@link JPEGQTable JPEGQTable} and{@link JPEGHuffmanTable JPEGHuffmanTable}.
If a stream does contain tables, the tables given in a JPEGImageReadParam are ignored. Furthermore, if the first image in a stream does contain tables and subsequent ones do not, then the tables given in the first image are used for all the abbreviated images. Once tables have been read from a stream, they can be overridden only by tables subsequently read from the same stream. In order to specify new tables, the {@link javax.imageio.ImageReader#setInput setInput} method ofthe reader must be called to change the stream.
Note that this class does not provide a means for obtaining the tables found in a stream. These may be extracted from a stream by consulting the IIOMetadata object returned by the reader.
For more information about the operation of the built-in JPEG plug-ins, see the JPEG metadata format specification and usage notes.

    {
      decoder.dispose();
    }
    
    decoder = ImageIO.getImageReadersByFormatName("JPEG").next();
    param = new JPEGImageReadParam();
    huffmanACTables = createACHuffmanTables();
    huffmanDCTables = createDCHuffmanTables();
    qtable = createQTable(q);
    param.setDecodeTables(qtable, huffmanDCTables, huffmanACTables);
  }

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 */
public class TestJPEGImageReadParam implements Testlet
{
  public void test(TestHarness harness)
  {
    JPEGImageReadParam param = new JPEGImageReadParam();


    // valid data for testing.


    JPEGQTable[] qTables = new JPEGQTable[]
      {
        JPEGQTable.K1Luminance,
        JPEGQTable.K1Div2Luminance,
        JPEGQTable.K2Chrominance,
        JPEGQTable.K2Div2Chrominance
      };


    JPEGHuffmanTable[] DCHuffmanTables = new JPEGHuffmanTable[]
      {
        JPEGHuffmanTable.StdDCLuminance,
        JPEGHuffmanTable.StdDCChrominance
      };


    JPEGHuffmanTable[] ACHuffmanTables = new JPEGHuffmanTable[]
      {
        JPEGHuffmanTable.StdACLuminance,
        JPEGHuffmanTable.StdACChrominance
      };


    // check that tables are not set after construction.
    harness.check(!param.areTablesSet());


    // check that returned tables are null.
    harness.check(param.getQTables() == null);
    harness.check(param.getDCHuffmanTables() == null);
    harness.check(param.getACHuffmanTables() == null);


    // check failure modes for table setting
    // null argument
    boolean settingFailed = false;
    try
      {
        param.setDecodeTables(qTables, null, ACHuffmanTables);
      }
    catch (IllegalArgumentException e)
      {
        settingFailed = true;
      }
    harness.check(settingFailed);


    // invalid length for an array argument
    settingFailed = false;
    try
      {
        param.setDecodeTables(new JPEGQTable[]
            {
              JPEGQTable.K1Luminance,
              JPEGQTable.K1Div2Luminance,
              JPEGQTable.K2Chrominance,
              JPEGQTable.K2Div2Chrominance,
              JPEGQTable.K1Luminance
            }, DCHuffmanTables, ACHuffmanTables);
      }
    catch (IllegalArgumentException e)
      {
        settingFailed = true;
      }
    harness.check(settingFailed);


    // differing lengths for Huffman table array arguments
    settingFailed = false;
    try
      {
        param.setDecodeTables(qTables, new JPEGHuffmanTable[]
            {
              JPEGHuffmanTable.StdDCLuminance
            }, ACHuffmanTables);
      }
    catch (IllegalArgumentException e)
      {
        settingFailed = true;
      }
    harness.check(settingFailed);


    // check valid setting
    settingFailed = false;
    try
      {
        param.setDecodeTables(qTables, DCHuffmanTables, ACHuffmanTables);
      }
    catch (IllegalArgumentException e)
      {
        settingFailed = true;
      }
    harness.check(!settingFailed);


    // check tables set
    harness.check(param.areTablesSet());


    // check getting tables
    JPEGQTable[] gotQTables = param.getQTables();
    harness.check(gotQTables != null);
    harness.check(Arrays.equals(qTables, gotQTables));


    JPEGHuffmanTable[] gotDCHuffmanTables = param.getDCHuffmanTables();
    harness.check(gotDCHuffmanTables != null);
    harness.check(Arrays.equals(DCHuffmanTables, gotDCHuffmanTables));


    JPEGHuffmanTable[] gotACHuffmanTables = param.getACHuffmanTables();
    harness.check(gotACHuffmanTables != null);
    harness.check(Arrays.equals(ACHuffmanTables, gotACHuffmanTables));


    // check clearing tables
    param.unsetDecodeTables();


    // check getting null tables
    gotQTables = param.getQTables();
    harness.check(gotQTables == null);


    gotDCHuffmanTables = param.getDCHuffmanTables();
    harness.check(gotDCHuffmanTables == null);


    gotACHuffmanTables = param.getACHuffmanTables();
    harness.check(gotACHuffmanTables == null);


    // check that areTablesSet returns false
    harness.check(!param.areTablesSet());
  }

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        iis = (ImageInputStream) input;
    }


    @Override
    public ImageReadParam getDefaultReadParam() {
        return new JPEGImageReadParam();
    }

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            minProgressivePass = param.getSourceMinProgressivePass();
            maxProgressivePass = param.getSourceMaxProgressivePass();


            if (param instanceof JPEGImageReadParam) {
                JPEGImageReadParam jparam = (JPEGImageReadParam) param;
                if (jparam.areTablesSet()) {
                    abbrevQTables = jparam.getQTables();
                    abbrevDCHuffmanTables = jparam.getDCHuffmanTables();
                    abbrevACHuffmanTables = jparam.getACHuffmanTables();
                }
            }
        }


        int lineSize = destROI.width*numRasterBands;

View Full Code Here

    private native void setOutColorSpace(long structPointer, int id);


    /////// End of Color Conversion & Image Types
    
    public ImageReadParam getDefaultReadParam() {
        return new JPEGImageReadParam();
    }

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            minProgressivePass = param.getSourceMinProgressivePass();
            maxProgressivePass = param.getSourceMaxProgressivePass();


            if (param instanceof JPEGImageReadParam) {
                JPEGImageReadParam jparam = (JPEGImageReadParam) param;
                if (jparam.areTablesSet()) {
                    abbrevQTables = jparam.getQTables();
                    abbrevDCHuffmanTables = jparam.getDCHuffmanTables();
                    abbrevACHuffmanTables = jparam.getACHuffmanTables();
                }
            }
        }


        int lineSize = destROI.width*numRasterBands;

View Full Code Here

    private native void setOutColorSpace(long structPointer, int id);


    /////// End of Color Conversion & Image Types


    public ImageReadParam getDefaultReadParam() {
        return new JPEGImageReadParam();
    }

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            minProgressivePass = param.getSourceMinProgressivePass();
            maxProgressivePass = param.getSourceMaxProgressivePass();


            if (param instanceof JPEGImageReadParam) {
                JPEGImageReadParam jparam = (JPEGImageReadParam) param;
                if (jparam.areTablesSet()) {
                    abbrevQTables = jparam.getQTables();
                    abbrevDCHuffmanTables = jparam.getDCHuffmanTables();
                    abbrevACHuffmanTables = jparam.getACHuffmanTables();
                }
            }
        }


        int lineSize = destROI.width*numRasterBands;

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    private native void setOutColorSpace(long structPointer, int id);


    /////// End of Color Conversion & Image Types


    public ImageReadParam getDefaultReadParam() {
        return new JPEGImageReadParam();
    }

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            minProgressivePass = param.getSourceMinProgressivePass();
            maxProgressivePass = param.getSourceMaxProgressivePass();


            if (param instanceof JPEGImageReadParam) {
                JPEGImageReadParam jparam = (JPEGImageReadParam) param;
                if (jparam.areTablesSet()) {
                    abbrevQTables = jparam.getQTables();
                    abbrevDCHuffmanTables = jparam.getDCHuffmanTables();
                    abbrevACHuffmanTables = jparam.getACHuffmanTables();
                }
            }
        }


        int lineSize = destROI.width*numRasterBands;

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