| /* ==================================================================== |
| 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.poi.sl.image; |
| |
| import java.awt.Dimension; |
| import java.awt.Rectangle; |
| |
| import org.apache.poi.util.Internal; |
| import org.apache.poi.util.Units; |
| |
| @Internal |
| public class ImageHeaderPICT { |
| /** |
| * skip the first 512 bytes - they are MAC specific crap |
| */ |
| public static final int PICT_HEADER_OFFSET = 512; |
| |
| public static final double DEFAULT_RESOLUTION = Units.POINT_DPI; |
| |
| private static final byte[] V2_HEADER = { |
| 0x00, 0x11, // v2 version opcode |
| 0x02, (byte) 0xFF, // version number of new picture |
| 0x0C, 0x00, // header opcode |
| (byte) 0xFF, (byte) 0xFE, 0x00, 0x00 // pic size dummy |
| }; |
| |
| private final Rectangle bounds; |
| private final double hRes, vRes; |
| |
| public ImageHeaderPICT(byte[] data, final int off) { |
| // http://mirrors.apple2.org.za/apple.cabi.net/Graphics/PICT.and_QT.INFO/PICT.file.format.TI.txt |
| int offset = off; |
| // low order 16 bits of picture size - can be ignored |
| offset += 2; |
| // rectangular bounding box of picture, at 72 dpi |
| // rect : 8 bytes (top, left, bottom, right: integer) |
| int y1 = readUnsignedShort(data, offset); offset += 2; |
| int x1 = readUnsignedShort(data, offset); offset += 2; |
| int y2 = readUnsignedShort(data, offset); offset += 2; |
| int x2 = readUnsignedShort(data, offset); offset += 2; |
| |
| // check for version 2 ... otherwise we don't read any further |
| boolean isV2 = true; |
| for (byte b : V2_HEADER) { |
| if (b != data[offset++]) { |
| isV2 = false; |
| break; |
| } |
| } |
| |
| if (isV2) { |
| // 4 bytes - fixed, horizontal resolution (dpi) of source data |
| hRes = readFixedPoint(data, offset); offset += 4; |
| // 4 bytes - fixed, vertical resolution (dpi) of source data |
| vRes = readFixedPoint(data, offset); offset += 4; |
| } else { |
| hRes = DEFAULT_RESOLUTION; |
| vRes = DEFAULT_RESOLUTION; |
| } |
| |
| bounds = new Rectangle(x1,y1,x2-x1,y2-y1); |
| } |
| |
| public Dimension getSize() { |
| int height = (int)Math.round(bounds.height*DEFAULT_RESOLUTION/vRes); |
| int width = (int)Math.round(bounds.width*DEFAULT_RESOLUTION/hRes); |
| return new Dimension(width, height); |
| } |
| |
| public Rectangle getBounds() { |
| return bounds; |
| } |
| |
| private static int readUnsignedShort(byte[] data, int offset) { |
| int b0 = data[offset] & 0xFF; |
| int b1 = data[offset+1] & 0xFF; |
| return b0 << 8 | b1; |
| } |
| |
| private static double readFixedPoint(byte[] data, int offset) { |
| int b0 = data[offset] & 0xFF; |
| int b1 = data[offset+1] & 0xFF; |
| int b2 = data[offset+2] & 0xFF; |
| int b3 = data[offset+3] & 0xFF; |
| int i = (b0 << 24) | (b1 << 16) | (b2 << 8) | b3; |
| return i / (double)0x10000; |
| } |
| } |