| /* |
| * 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.bmp.pixelparsers; |
| |
| import java.io.IOException; |
| |
| import org.apache.commons.imaging.ImageReadException; |
| import org.apache.commons.imaging.formats.bmp.BmpHeaderInfo; |
| |
| public class PixelParserRgb extends PixelParserSimple |
| { |
| public PixelParserRgb(BmpHeaderInfo bhi, byte ColorTable[], |
| byte ImageData[]) |
| { |
| super(bhi, ColorTable, ImageData); |
| |
| } |
| |
| private int bytecount = 0; |
| private int cached_bit_count = 0; |
| private int cached_byte = 0; |
| |
| int pixelCount = 0; |
| |
| @Override |
| public int getNextRGB() throws ImageReadException, IOException |
| { |
| pixelCount++; |
| |
| if ((bhi.bitsPerPixel == 1) // always grayscale? |
| || (bhi.bitsPerPixel == 4)) // always grayscale? |
| { |
| if (cached_bit_count < bhi.bitsPerPixel) |
| { |
| if (cached_bit_count != 0) |
| throw new ImageReadException("Unexpected leftover bits: " |
| + cached_bit_count + "/" + bhi.bitsPerPixel); |
| |
| cached_bit_count += 8; |
| cached_byte = |
| (0xff & imageData[bytecount]); |
| bytecount++; |
| } |
| int cache_mask = (1 << bhi.bitsPerPixel) - 1; |
| int sample = cache_mask & (cached_byte >> (8 - bhi.bitsPerPixel)); |
| cached_byte = 0xff & (cached_byte << bhi.bitsPerPixel); |
| cached_bit_count -= bhi.bitsPerPixel; |
| |
| int rgb = getColorTableRGB(sample); |
| |
| return rgb; |
| } else if (bhi.bitsPerPixel == 8) // always grayscale? |
| { |
| int sample = 0xff & imageData[bytecount + 0]; |
| |
| int rgb = getColorTableRGB(sample); |
| |
| bytecount += 1; |
| |
| return rgb; |
| } else if (bhi.bitsPerPixel == 16) |
| { |
| int data = bfp.read2Bytes("Pixel", is, "BMP Image Data"); |
| |
| int blue = (0x1f & (data >> 0)) << 3; |
| int green = (0x1f & (data >> 5)) << 3; |
| int red = (0x1f & (data >> 10)) << 3; |
| int alpha = 0xff; |
| |
| int rgb = (alpha << 24) | (red << 16) | (green << 8) | (blue << 0); |
| |
| bytecount += 2; |
| |
| return rgb; |
| } else if (bhi.bitsPerPixel == 24) |
| { |
| int blue = 0xff & imageData[bytecount + 0]; |
| int green = 0xff & imageData[bytecount + 1]; |
| int red = 0xff & imageData[bytecount + 2]; |
| int alpha = 0xff; |
| |
| int rgb = (alpha << 24) | (red << 16) | (green << 8) | (blue << 0); |
| |
| bytecount += 3; |
| |
| return rgb; |
| } else if (bhi.bitsPerPixel == 32) |
| { |
| int blue = 0xff & imageData[bytecount + 0]; |
| int green = 0xff & imageData[bytecount + 1]; |
| int red = 0xff & imageData[bytecount + 2]; |
| int alpha = 0xff; |
| |
| int rgb = (alpha << 24) | (red << 16) | (green << 8) | (blue << 0); |
| |
| bytecount += 4; |
| |
| return rgb; |
| } |
| |
| throw new ImageReadException("Unknown BitsPerPixel: " |
| + bhi.bitsPerPixel); |
| } |
| |
| @Override |
| public void newline() throws ImageReadException, IOException |
| { |
| cached_bit_count = 0; |
| |
| while (((bytecount) % 4) != 0) |
| { |
| bfp.readByte("Pixel", is, "BMP Image Data"); |
| bytecount++; |
| } |
| } |
| } |