/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You under the Apache License, Version 2.0
    * (the "License"); you may not use this file except in compliance with
    * the License.  You may obtain a copy of the License at
    *
    *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.commons.imaging.formats.png;
  
  import java.awt.image.BufferedImage;
  import java.io.IOException;
  import java.io.InputStream;
  
  import org.apache.commons.imaging.ImagingException;
  import org.apache.commons.imaging.formats.png.chunks.PngChunkPlte;
  import org.apache.commons.imaging.formats.png.transparencyfilters.AbstractTransparencyFilter;
  
  final class ScanExpediterSimple extends AbstractScanExpediter {
      ScanExpediterSimple(final int width, final int height, final InputStream is, final BufferedImage bi, final PngColorType pngColorType, final int bitDepth,
              final int bitsPerPixel, final PngChunkPlte pngChunkPLTE, final GammaCorrection gammaCorrection,
              final AbstractTransparencyFilter abstractTransparencyFilter) {
          super(width, height, is, bi, pngColorType, bitDepth, bitsPerPixel, pngChunkPLTE, gammaCorrection, abstractTransparencyFilter);
      }
  
      @Override
      public void drive() throws ImagingException, IOException {
          final int bitsPerScanLine = bitsPerPixel * width;
          final int pixelBytesPerScanLine = getBitsToBytesRoundingUp(bitsPerScanLine);
          byte[] prev = null;
  
          for (int y = 0; y < height; y++) {
              final byte[] unfiltered = getNextScanline(is, pixelBytesPerScanLine, prev, bytesPerPixel);
  
              prev = unfiltered;
  
              final BitParser bitParser = new BitParser(unfiltered, bitsPerPixel, bitDepth);
  
              for (int x = 0; x < width; x++) {
                  final int rgb = getRgb(bitParser, x);
  
                  bi.setRGB(x, y, rgb);
              }
          }
  
      }
  }