| /* |
| * 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.sanselan.formats.png; |
| |
| import java.awt.image.BufferedImage; |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| import org.apache.commons.sanselan.ImageReadException; |
| import org.apache.commons.sanselan.formats.png.chunks.PngChunkPlte; |
| import org.apache.commons.sanselan.formats.transparencyfilters.TransparencyFilter; |
| |
| public class ScanExpediterInterlaced extends ScanExpediter |
| { |
| public ScanExpediterInterlaced(int width, int height, InputStream is, |
| BufferedImage bi, int color_type, int BitDepth, int bits_per_pixel, |
| PngChunkPlte fPNGChunkPLTE, GammaCorrection fGammaCorrection, |
| TransparencyFilter fTransparencyFilter) |
| |
| { |
| super(width, height, is, bi, color_type, BitDepth, bits_per_pixel, |
| fPNGChunkPLTE, fGammaCorrection, fTransparencyFilter); |
| } |
| |
| private void visit(int x, int y, BufferedImage bi, BitParser fBitParser, |
| int color_type, int pixel_index_in_scanline, |
| PngChunkPlte fPNGChunkPLTE, GammaCorrection fGammaCorrection) |
| throws ImageReadException, IOException |
| { |
| int rgb = getRGB(fBitParser, |
| // color_type, |
| pixel_index_in_scanline |
| // , |
| // fPNGChunkPLTE, fGammaCorrection |
| ); |
| |
| bi.setRGB(x, y, rgb); |
| |
| // buffer.setElem(y * width +x , rgb); |
| |
| } |
| |
| private static final int Starting_Row[] = { |
| 0, 0, 4, 0, 2, 0, 1 |
| }; |
| private static final int Starting_Col[] = { |
| 0, 4, 0, 2, 0, 1, 0 |
| }; |
| private static final int Row_Increment[] = { |
| 8, 8, 8, 4, 4, 2, 2 |
| }; |
| private static final int Col_Increment[] = { |
| 8, 8, 4, 4, 2, 2, 1 |
| }; |
| private static final int Block_Height[] = { |
| 8, 8, 4, 4, 2, 2, 1 |
| }; |
| private static final int Block_Width[] = { |
| 8, 4, 4, 2, 2, 1, 1 |
| }; |
| |
| @Override |
| public void drive() throws ImageReadException, IOException |
| { |
| |
| int pass = 1; |
| while (pass <= 7) |
| { |
| byte prev[] = null; |
| |
| int y = Starting_Row[pass - 1]; |
| // int y_stride = Row_Increment[pass - 1]; |
| boolean rows_in_pass = (y < height); |
| while (y < height) |
| { |
| int x = Starting_Col[pass - 1]; |
| int pixel_index_in_scanline = 0; |
| |
| if (x < width) |
| { |
| // only get data if there are pixels in this scanline/pass |
| int ColumnsInRow = 1 + ((width - Starting_Col[pass - 1] - 1) / Col_Increment[pass - 1]); |
| int bitsPerScanLine = bitsPerPixel * ColumnsInRow; |
| int pixel_bytes_per_scan_line = getBitsToBytesRoundingUp(bitsPerScanLine); |
| |
| byte unfiltered[] = getNextScanline(is, |
| pixel_bytes_per_scan_line, prev, bytesPerPixel); |
| |
| prev = unfiltered; |
| |
| BitParser fBitParser = new BitParser(unfiltered, |
| bitsPerPixel, bitDepth); |
| |
| while (x < width) |
| { |
| visit(x, y, bi, fBitParser, colorType, |
| pixel_index_in_scanline, pngChunkPLTE, |
| gammaCorrection); |
| |
| x = x + Col_Increment[pass - 1]; |
| pixel_index_in_scanline++; |
| } |
| } |
| y = y + Row_Increment[pass - 1]; |
| } |
| pass = pass + 1; |
| } |
| } |
| } |