lookupop.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN""http://www.w3.org/TR/REC-html40/frameset.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc on Thu Apr 27 23:34:09 PDT 2000 --><TITLE>Java 2 Platform SE v1.3: Class LookupOp</TITLE><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../stylesheet.css" TITLE="Style"></HEAD><BODY BGCOLOR="white"><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_top"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/LookupOp.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../index-files/index-1.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM><b>Java<sup><font size=-2>TM</font></sup> 2 Platform<br>Std. Ed. v1.3</b></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../java/awt/image/Kernel.html"><B>PREV CLASS</B></A> <A HREF="../../../java/awt/image/LookupTable.html"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../index.html" TARGET="_top"><B>FRAMES</B></A> <A HREF="LookupOp.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: INNER | FIELD | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><!-- =========== END OF NAVBAR =========== --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">java.awt.image</FONT><BR>Class LookupOp</H2><PRE><A HREF="../../../java/lang/Object.html">java.lang.Object</A> | +--<B>java.awt.image.LookupOp</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../java/awt/image/BufferedImageOp.html">BufferedImageOp</A>, <A HREF="../../../java/awt/image/RasterOp.html">RasterOp</A></DD></DL><HR><DL><DT>public class <B>LookupOp</B><DT>extends <A HREF="../../../java/lang/Object.html">Object</A><DT>implements <A HREF="../../../java/awt/image/BufferedImageOp.html">BufferedImageOp</A>, <A HREF="../../../java/awt/image/RasterOp.html">RasterOp</A></DL><P>This class implements a lookup operation from the source to the destination. The LookupTable object may contain a single array or multiple arrays, subject to the restrictions below. <p> For Rasters, the lookup operates on bands. The number of lookup arrays may be one, in which case the same array is applied to all bands, or it must equal the number of Source Raster bands. <p> For BufferedImages, the lookup operates on color and alpha components. The number of lookup arrays may be one, in which case the same array is applied to all color (but not alpha) components. Otherwise, the number of lookup arrays may equal the number of Source color components, in which case no lookup of the alpha component (if present) is performed. If neither of these cases apply, the number of lookup arrays must equal the number of Source color components plus alpha components, in which case lookup is performed for all color and alpha components. This allows non-uniform rescaling of multi-band BufferedImages. <p> BufferedImage sources with premultiplied alpha data are treated in the same manner as non-premultiplied images for purposes of the lookup. That is, the lookup is done per band on the raw data of the BufferedImage source without regard to whether the data is premultiplied. If a color conversion is required to the destination ColorModel, the premultiplied state of both source and destination will be taken into account for this step. <p> Images with an IndexColorModel cannot be used. <p> If a RenderingHints object is specified in the constructor, the color rendering hint and the dithering hint may be used when color conversion is required. <p> This class allows the Source to be the same as the Destination.<P><DL><DT><B>See Also: </B><DD><A HREF="../../../java/awt/image/LookupTable.html"><CODE>LookupTable</CODE></A>, <A HREF="../../../java/awt/RenderingHints.html#KEY_COLOR_RENDERING"><CODE>RenderingHints.KEY_COLOR_RENDERING</CODE></A>, <A HREF="../../../java/awt/RenderingHints.html#KEY_DITHERING"><CODE>RenderingHints.KEY_DITHERING</CODE></A></DL><HR><P><!-- ======== INNER CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Constructor Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../../java/awt/image/LookupOp.html#LookupOp(java.awt.image.LookupTable, java.awt.RenderingHints)">LookupOp</A></B>(<A HREF="../../../java/awt/image/LookupTable.html">LookupTable</A> lookup, <A HREF="../../../java/awt/RenderingHints.html">RenderingHints</A> hints)</CODE><BR> Constructs a LookupOp object given the lookup table and a RenderingHints object (which may be null).</TD></TR></TABLE> <!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Method Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../java/awt/image/BufferedImage.html">BufferedImage</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../java/awt/image/LookupOp.html#createCompatibleDestImage(java.awt.image.BufferedImage, java.awt.image.ColorModel)">createCompatibleDestImage</A></B>(<A HREF="../../../java/awt/image/BufferedImage.html">BufferedImage</A> src, <A HREF="../../../java/awt/image/ColorModel.html">ColorModel</A> destCM)</CODE><BR> Creates a zeroed destination image with the correct size and number of bands.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../java/awt/image/WritableRaster.html">WritableRaster</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../java/awt/image/LookupOp.html#createCompatibleDestRaster(java.awt.image.Raster)">createCompatibleDestRaster</A></B>(<A HREF="../../../java/awt/image/Raster.html">Raster</A> src)</CODE><BR> Creates a zeroed destination Raster with the correct size and number of bands, given this source.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../java/awt/image/BufferedImage.html">BufferedImage</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../java/awt/image/LookupOp.html#filter(java.awt.image.BufferedImage, java.awt.image.BufferedImage)">filter</A></B>(<A HREF="../../../java/awt/image/BufferedImage.html">BufferedImage</A> src, <A HREF="../../../java/awt/image/BufferedImage.html">BufferedImage</A> dst)</CODE><BR> Performs a lookup operation on a BufferedImage.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../java/awt/image/WritableRaster.html">WritableRaster</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../java/awt/image/LookupOp.html#filter(java.awt.image.Raster, java.awt.image.WritableRaster)">filter</A></B>(<A HREF="../../../java/awt/image/Raster.html">Raster</A> src, <A HREF="../../../java/awt/image/WritableRaster.html">WritableRaster</A> dst)</CODE><BR> Performs a lookup operation on a Raster.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../java/awt/geom/Rectangle2D.html">Rectangle2D</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../java/awt/image/LookupOp.html#getBounds2D(java.awt.image.BufferedImage)">getBounds2D</A></B>(<A HREF="../../../java/awt/image/BufferedImage.html">BufferedImage</A> src)</CODE><BR> Returns the bounding box of the filtered destination image.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../java/awt/geom/Rectangle2D.html">Rectangle2D</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../java/awt/image/LookupOp.html#getBounds2D(java.awt.image.Raster)">getBounds2D</A></B>(<A HREF="../../../java/awt/image/Raster.html">Raster</A> src)</CODE><BR> Returns the bounding box of the filtered destination Raster.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../java/awt/geom/Point2D.html">Point2D</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../java/awt/image/LookupOp.html#getPoint2D(java.awt.geom.Point2D, java.awt.geom.Point2D)">getPoint2D</A></B>(<A HREF="../../../java/awt/geom/Point2D.html">Point2D</A> srcPt, <A HREF="../../../java/awt/geom/Point2D.html">Point2D</A> dstPt)</CODE><BR> Returns the location of the destination point given a point in the source.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../java/awt/RenderingHints.html">RenderingHints</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../java/awt/image/LookupOp.html#getRenderingHints()">getRenderingHints</A></B>()</CODE><BR> Returns the rendering hints for this op.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../java/awt/image/LookupTable.html">LookupTable</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../java/awt/image/LookupOp.html#getTable()">getTable</A></B>()</CODE>⌨️ 快捷键说明
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