| /* ==================================================================== |
| 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.hwmf.record; |
| |
| import java.awt.geom.Rectangle2D; |
| import java.io.IOException; |
| |
| import org.apache.poi.util.LittleEndianConsts; |
| import org.apache.poi.util.LittleEndianInputStream; |
| |
| public class HwmfPlaceableHeader { |
| public static final int WMF_HEADER_MAGIC = 0x9AC6CDD7; |
| |
| final Rectangle2D bounds; |
| final int unitsPerInch; |
| |
| protected HwmfPlaceableHeader(LittleEndianInputStream leis) throws IOException { |
| /* |
| * HWmf (2 bytes): The resource handle to the metafile, when the metafile is in memory. When |
| * the metafile is on disk, this field MUST contain 0x0000. This attribute of the metafile is |
| * specified in the Type field of the META_HEADER record. |
| */ |
| leis.readShort(); // ignore |
| |
| /* |
| * BoundingBox (8 bytes): The destination rectangle, measured in logical units, for displaying |
| * the metafile. The size of a logical unit is specified by the Inch field. |
| */ |
| int x1 = leis.readShort(); |
| int y1 = leis.readShort(); |
| int x2 = leis.readShort(); |
| int y2 = leis.readShort(); |
| bounds = new Rectangle2D.Double(Math.min(x1,x2), Math.min(y1,y2), Math.abs(x2-x1), Math.abs(y2-y1)); |
| |
| /* |
| * Inch (2 bytes): The number of logical units per inch used to represent the image. |
| * This value can be used to scale an image. |
| * By convention, an image is considered to be recorded at 1440 logical units (twips) per inch. |
| * Thus, a value of 720 specifies that the image SHOULD be rendered at twice its normal size, |
| * and a value of 2880 specifies that the image SHOULD be rendered at half its normal size. |
| */ |
| unitsPerInch = leis.readShort(); |
| |
| /* |
| * Reserved (4 bytes): A field that is not used and MUST be set to 0x00000000. |
| */ |
| leis.readInt(); |
| |
| /* |
| * Checksum (2 bytes): A checksum for the previous 10 16-bit values in the header. |
| * This value can be used to determine whether the metafile has become corrupted. |
| */ |
| leis.readShort(); |
| |
| // sometimes the placeable header is filled/aligned to dwords. |
| // check for padding 0 bytes. |
| leis.mark(LittleEndianConsts.INT_SIZE); |
| if (leis.readShort() != 0) { |
| leis.reset(); |
| } |
| } |
| |
| public static HwmfPlaceableHeader readHeader(LittleEndianInputStream leis) throws IOException { |
| leis.mark(LittleEndianConsts.INT_SIZE); |
| int magic = leis.readInt(); |
| if (magic == WMF_HEADER_MAGIC) { |
| return new HwmfPlaceableHeader(leis); |
| } else { |
| leis.reset(); |
| return null; |
| } |
| } |
| |
| public Rectangle2D getBounds() { |
| return bounds; |
| } |
| |
| public int getUnitsPerInch() { |
| return unitsPerInch; |
| } |
| } |