Exemplo n.º 1
0
  private void writeGraphicControlExtension(
      int disposalMethod,
      boolean userInputFlag,
      boolean transparentColorFlag,
      int delayTime,
      int transparentColorIndex)
      throws IOException {
    try {
      stream.write(0x21);
      stream.write(0xf9);

      stream.write(4);

      int packedFields = (disposalMethod & 0x3) << 2;
      if (userInputFlag) {
        packedFields |= 0x2;
      }
      if (transparentColorFlag) {
        packedFields |= 0x1;
      }
      stream.write(packedFields);

      stream.writeShort((short) delayTime);

      stream.write(transparentColorIndex);
      stream.write(0x00);
    } catch (IOException e) {
      throw new IIOException("I/O error writing Graphic Control Extension!", e);
    }
  }
Exemplo n.º 2
0
 private void writeBlocks(byte[] data) throws IOException {
   if (data != null && data.length > 0) {
     int offset = 0;
     while (offset < data.length) {
       int len = Math.min(data.length - offset, 255);
       stream.write(len);
       stream.write(data, offset, len);
       offset += len;
     }
   }
 }
Exemplo n.º 3
0
 private void writeCommentExtension(GIFWritableImageMetadata im) throws IOException {
   if (im.comments != null) {
     try {
       Iterator iter = im.comments.iterator();
       while (iter.hasNext()) {
         stream.write(0x21);
         stream.write(0xfe);
         writeBlocks((byte[]) iter.next());
         stream.write(0x00);
       }
     } catch (IOException e) {
       throw new IIOException("I/O error writing Comment Extension!", e);
     }
   }
 }
Exemplo n.º 4
0
  private void writeHeader(
      String version,
      int logicalScreenWidth,
      int logicalScreenHeight,
      int colorResolution,
      int pixelAspectRatio,
      int backgroundColorIndex,
      boolean sortFlag,
      int bitsPerPixel,
      byte[] globalColorTable)
      throws IOException {
    try {
      // Signature
      stream.writeBytes("GIF" + version);

      // Screen Descriptor
      // Width
      stream.writeShort((short) logicalScreenWidth);

      // Height
      stream.writeShort((short) logicalScreenHeight);

      // Global Color Table
      // Packed fields
      int packedFields = globalColorTable != null ? 0x80 : 0x00;
      packedFields |= ((colorResolution - 1) & 0x7) << 4;
      if (sortFlag) {
        packedFields |= 0x8;
      }
      packedFields |= (bitsPerPixel - 1);
      stream.write(packedFields);

      // Background color index
      stream.write(backgroundColorIndex);

      // Pixel aspect ratio
      stream.write(pixelAspectRatio);

      // Global Color Table
      if (globalColorTable != null) {
        stream.write(globalColorTable);
      }
    } catch (IOException e) {
      throw new IIOException("I/O error writing header!", e);
    }
  }
Exemplo n.º 5
0
  private void writePlainTextExtension(GIFWritableImageMetadata im) throws IOException {
    if (im.hasPlainTextExtension) {
      try {
        stream.write(0x21);
        stream.write(0x1);

        stream.write(12);

        stream.writeShort(im.textGridLeft);
        stream.writeShort(im.textGridTop);
        stream.writeShort(im.textGridWidth);
        stream.writeShort(im.textGridHeight);
        stream.write(im.characterCellWidth);
        stream.write(im.characterCellHeight);
        stream.write(im.textForegroundColor);
        stream.write(im.textBackgroundColor);

        writeBlocks(im.text);

        stream.write(0x00);
      } catch (IOException e) {
        throw new IIOException("I/O error writing Plain Text Extension!", e);
      }
    }
  }
Exemplo n.º 6
0
  private void writeImageDescriptor(
      int imageLeftPosition,
      int imageTopPosition,
      int imageWidth,
      int imageHeight,
      boolean interlaceFlag,
      boolean sortFlag,
      int bitsPerPixel,
      byte[] localColorTable)
      throws IOException {

    try {
      stream.write(0x2c);

      stream.writeShort((short) imageLeftPosition);
      stream.writeShort((short) imageTopPosition);
      stream.writeShort((short) imageWidth);
      stream.writeShort((short) imageHeight);

      int packedFields = localColorTable != null ? 0x80 : 0x00;
      if (interlaceFlag) {
        packedFields |= 0x40;
      }
      if (sortFlag) {
        packedFields |= 0x8;
      }
      packedFields |= (bitsPerPixel - 1);
      stream.write(packedFields);

      if (localColorTable != null) {
        stream.write(localColorTable);
      }
    } catch (IOException e) {
      throw new IIOException("I/O error writing Image Descriptor!", e);
    }
  }
Exemplo n.º 7
0
  private void writeApplicationExtension(GIFWritableImageMetadata im) throws IOException {
    if (im.applicationIDs != null) {
      Iterator iterIDs = im.applicationIDs.iterator();
      Iterator iterCodes = im.authenticationCodes.iterator();
      Iterator iterData = im.applicationData.iterator();

      while (iterIDs.hasNext()) {
        try {
          stream.write(0x21);
          stream.write(0xff);

          stream.write(11);
          stream.write((byte[]) iterIDs.next(), 0, 8);
          stream.write((byte[]) iterCodes.next(), 0, 3);

          writeBlocks((byte[]) iterData.next());

          stream.write(0x00);
        } catch (IOException e) {
          throw new IIOException("I/O error writing Application Extension!", e);
        }
      }
    }
  }
Exemplo n.º 8
0
  private void writeRasterData(
      RenderedImage image,
      Rectangle sourceBounds,
      Dimension destSize,
      ImageWriteParam param,
      boolean interlaceFlag)
      throws IOException {

    int sourceXOffset = sourceBounds.x;
    int sourceYOffset = sourceBounds.y;
    int sourceWidth = sourceBounds.width;
    int sourceHeight = sourceBounds.height;

    int destWidth = destSize.width;
    int destHeight = destSize.height;

    int periodX;
    int periodY;
    if (param == null) {
      periodX = 1;
      periodY = 1;
    } else {
      periodX = param.getSourceXSubsampling();
      periodY = param.getSourceYSubsampling();
    }

    SampleModel sampleModel = image.getSampleModel();
    int bitsPerPixel = sampleModel.getSampleSize()[0];

    int initCodeSize = bitsPerPixel;
    if (initCodeSize == 1) {
      initCodeSize++;
    }
    stream.write(initCodeSize);

    LZWCompressor compressor = new LZWCompressor(stream, initCodeSize, false);

    boolean isOptimizedCase =
        periodX == 1
            && periodY == 1
            && sampleModel instanceof ComponentSampleModel
            && image.getNumXTiles() == 1
            && image.getNumYTiles() == 1
            && image.getTile(0, 0).getDataBuffer() instanceof DataBufferByte;

    int numRowsWritten = 0;

    int progressReportRowPeriod = Math.max(destHeight / 20, 1);

    processImageStarted(imageIndex);

    if (interlaceFlag) {
      if (DEBUG) System.out.println("Writing interlaced");

      if (isOptimizedCase) {
        Raster tile = image.getTile(0, 0);
        byte[] data = ((DataBufferByte) tile.getDataBuffer()).getData();
        ComponentSampleModel csm = (ComponentSampleModel) tile.getSampleModel();
        int offset = csm.getOffset(sourceXOffset, sourceYOffset, 0);
        int lineStride = csm.getScanlineStride();

        writeRowsOpt(
            data,
            offset,
            lineStride,
            compressor,
            0,
            8,
            destWidth,
            destHeight,
            numRowsWritten,
            progressReportRowPeriod);

        if (abortRequested()) {
          return;
        }

        numRowsWritten += destHeight / 8;

        writeRowsOpt(
            data,
            offset,
            lineStride,
            compressor,
            4,
            8,
            destWidth,
            destHeight,
            numRowsWritten,
            progressReportRowPeriod);

        if (abortRequested()) {
          return;
        }

        numRowsWritten += (destHeight - 4) / 8;

        writeRowsOpt(
            data,
            offset,
            lineStride,
            compressor,
            2,
            4,
            destWidth,
            destHeight,
            numRowsWritten,
            progressReportRowPeriod);

        if (abortRequested()) {
          return;
        }

        numRowsWritten += (destHeight - 2) / 4;

        writeRowsOpt(
            data,
            offset,
            lineStride,
            compressor,
            1,
            2,
            destWidth,
            destHeight,
            numRowsWritten,
            progressReportRowPeriod);
      } else {
        writeRows(
            image,
            compressor,
            sourceXOffset,
            periodX,
            sourceYOffset,
            8 * periodY,
            sourceWidth,
            0,
            8,
            destWidth,
            destHeight,
            numRowsWritten,
            progressReportRowPeriod);

        if (abortRequested()) {
          return;
        }

        numRowsWritten += destHeight / 8;

        writeRows(
            image,
            compressor,
            sourceXOffset,
            periodX,
            sourceYOffset + 4 * periodY,
            8 * periodY,
            sourceWidth,
            4,
            8,
            destWidth,
            destHeight,
            numRowsWritten,
            progressReportRowPeriod);

        if (abortRequested()) {
          return;
        }

        numRowsWritten += (destHeight - 4) / 8;

        writeRows(
            image,
            compressor,
            sourceXOffset,
            periodX,
            sourceYOffset + 2 * periodY,
            4 * periodY,
            sourceWidth,
            2,
            4,
            destWidth,
            destHeight,
            numRowsWritten,
            progressReportRowPeriod);

        if (abortRequested()) {
          return;
        }

        numRowsWritten += (destHeight - 2) / 4;

        writeRows(
            image,
            compressor,
            sourceXOffset,
            periodX,
            sourceYOffset + periodY,
            2 * periodY,
            sourceWidth,
            1,
            2,
            destWidth,
            destHeight,
            numRowsWritten,
            progressReportRowPeriod);
      }
    } else {
      if (DEBUG) System.out.println("Writing non-interlaced");

      if (isOptimizedCase) {
        Raster tile = image.getTile(0, 0);
        byte[] data = ((DataBufferByte) tile.getDataBuffer()).getData();
        ComponentSampleModel csm = (ComponentSampleModel) tile.getSampleModel();
        int offset = csm.getOffset(sourceXOffset, sourceYOffset, 0);
        int lineStride = csm.getScanlineStride();

        writeRowsOpt(
            data,
            offset,
            lineStride,
            compressor,
            0,
            1,
            destWidth,
            destHeight,
            numRowsWritten,
            progressReportRowPeriod);
      } else {
        writeRows(
            image,
            compressor,
            sourceXOffset,
            periodX,
            sourceYOffset,
            periodY,
            sourceWidth,
            0,
            1,
            destWidth,
            destHeight,
            numRowsWritten,
            progressReportRowPeriod);
      }
    }

    if (abortRequested()) {
      return;
    }

    processImageProgress(100.0F);

    compressor.flush();

    stream.write(0x00);

    processImageComplete();
  }
Exemplo n.º 9
0
 private void writeTrailer() throws IOException {
   stream.write(0x3b);
 }