| 0,0 → 1,111 |
|---|
| /* |
| * This is public domain software - that is, you can do whatever you want |
| * with it, and include it software that is licensed under the GNU or the |
| * BSD license, or whatever other licence you choose, including proprietary |
| * closed source licenses. I do ask that you leave this header in tact. |
| * |
| * If you make modifications to this code that you think would benefit the |
| * wider community, please send me a copy and I'll post it on my site. |
| * |
| * If you make use of this code, I'd appreciate hearing about it. |
| * drew@drewnoakes.com |
| * Latest version of this software kept at |
| * http://drewnoakes.com/ |
| * |
| * Created on Aug 2, 2003. |
| */ |
| package com.drew.metadata.jpeg; |
| |
| import com.drew.metadata.Directory; |
| import com.drew.metadata.MetadataException; |
| |
| import java.util.HashMap; |
| |
| /** |
| * Directory of tags and values for the SOF0 Jpeg segment. This segment holds basic metadata about the image. |
| * @author Darrell Silver http://www.darrellsilver.com and Drew Noakes |
| */ |
| public class JpegDirectory extends Directory { |
| |
| /** This is in bits/sample, usually 8 (12 and 16 not supported by most software). */ |
| public static final int TAG_JPEG_DATA_PRECISION = 0; |
| /** The image's height. Necessary for decoding the image, so it should always be there. */ |
| public static final int TAG_JPEG_IMAGE_HEIGHT = 1; |
| /** The image's width. Necessary for decoding the image, so it should always be there. */ |
| public static final int TAG_JPEG_IMAGE_WIDTH = 3; |
| /** Usually 1 = grey scaled, 3 = color YcbCr or YIQ, 4 = color CMYK |
| * Each component TAG_COMPONENT_DATA_[1-4], has the following meaning: |
| * component Id(1byte)(1 = Y, 2 = Cb, 3 = Cr, 4 = I, 5 = Q), |
| * sampling factors (1byte) (bit 0-3 vertical., 4-7 horizontal.), |
| * quantization table number (1 byte). |
| * <p> |
| * This info is from http://www.funducode.com/freec/Fileformats/format3/format3b.htm |
| */ |
| public static final int TAG_JPEG_NUMBER_OF_COMPONENTS = 5; |
| |
| // NOTE! Component tag type int values must increment in steps of 1 |
| |
| /** the first of a possible 4 color components. Number of components specified in TAG_JPEG_NUMBER_OF_COMPONENTS.*/ |
| public static final int TAG_JPEG_COMPONENT_DATA_1 = 6; |
| /** the second of a possible 4 color components. Number of components specified in TAG_JPEG_NUMBER_OF_COMPONENTS.*/ |
| public static final int TAG_JPEG_COMPONENT_DATA_2 = 7; |
| /** the third of a possible 4 color components. Number of components specified in TAG_JPEG_NUMBER_OF_COMPONENTS.*/ |
| public static final int TAG_JPEG_COMPONENT_DATA_3 = 8; |
| /** the fourth of a possible 4 color components. Number of components specified in TAG_JPEG_NUMBER_OF_COMPONENTS.*/ |
| public static final int TAG_JPEG_COMPONENT_DATA_4 = 9; |
| |
| protected static final HashMap tagNameMap = new HashMap(); |
| |
| static { |
| tagNameMap.put(new Integer(TAG_JPEG_DATA_PRECISION), "Data Precision"); |
| tagNameMap.put(new Integer(TAG_JPEG_IMAGE_WIDTH), "Image Width"); |
| tagNameMap.put(new Integer(TAG_JPEG_IMAGE_HEIGHT), "Image Height"); |
| tagNameMap.put(new Integer(TAG_JPEG_NUMBER_OF_COMPONENTS), "Number of Components"); |
| tagNameMap.put(new Integer(TAG_JPEG_COMPONENT_DATA_1), "Component 1"); |
| tagNameMap.put(new Integer(TAG_JPEG_COMPONENT_DATA_2), "Component 2"); |
| tagNameMap.put(new Integer(TAG_JPEG_COMPONENT_DATA_3), "Component 3"); |
| tagNameMap.put(new Integer(TAG_JPEG_COMPONENT_DATA_4), "Component 4"); |
| } |
| |
| public JpegDirectory() { |
| this.setDescriptor(new JpegDescriptor(this)); |
| } |
| |
| public String getName() { |
| return "Jpeg"; |
| } |
| |
| protected HashMap getTagNameMap() { |
| return tagNameMap; |
| } |
| |
| /** |
| * |
| * @param componentNumber The zero-based index of the component. This number is normally between 0 and 3. |
| * Use getNumberOfComponents for bounds-checking. |
| * @return |
| */ |
| public JpegComponent getComponent(int componentNumber) |
| { |
| int tagType = JpegDirectory.TAG_JPEG_COMPONENT_DATA_1 + componentNumber; |
| |
| JpegComponent component = (JpegComponent)getObject(tagType); |
| |
| return component; |
| } |
| |
| public int getImageWidth() throws MetadataException |
| { |
| return getInt(JpegDirectory.TAG_JPEG_IMAGE_WIDTH); |
| } |
| |
| public int getImageHeight() throws MetadataException |
| { |
| return getInt(JpegDirectory.TAG_JPEG_IMAGE_HEIGHT); |
| } |
| |
| public int getNumberOfComponents() throws MetadataException |
| { |
| return getInt(JpegDirectory.TAG_JPEG_NUMBER_OF_COMPONENTS); |
| } |
| } |