JDK14/Java14源码在线阅读

/*
 * Copyright (c) 1998, 2000, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package sun.print;

import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Composite;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Paint;

import java.awt.font.TextLayout;

import java.awt.image.RenderedImage;
import java.awt.image.renderable.RenderableImage;

/**
 * Maintain information about the type of drawing
 * performed by a printing application.
 */
public class PeekMetrics {

    private boolean mHasNonSolidColors;

    private boolean mHasCompositing;

    private boolean mHasText;

    private boolean mHasImages;

    /**
     * Return {@code true} if the application
     * has done any drawing with a Paint that
     * is not an instance of {@code Color}
     */
    public boolean hasNonSolidColors() {
        return mHasNonSolidColors;
    }

    /**
     * Return true if the application has
     * done any drawing with an alpha other
     * than 1.0.
     */
    public boolean hasCompositing() {
        return mHasCompositing;
    }

    /**
     * Return true if the application has
     * drawn any text.
     */
    public boolean hasText() {
        return mHasText;
    }

    /**
     * Return true if the application has
     * drawn any images.
     */
    public boolean hasImages() {
        return mHasImages;
    }

    /**
     * The application is performing a fill
     * so record the needed information.
     */
    public void fill(Graphics2D g) {
        checkDrawingMode(g);
    }

    /**
     * The application is performing a draw
     * so record the needed information.
     */
    public void draw(Graphics2D g) {
        checkDrawingMode(g);
    }

    /**
     * The application is performing a clearRect
     * so record the needed information.
     */
    public void clear(Graphics2D g) {
        checkPaint(g.getBackground());
    }
    /**
     * The application is drawing text
     * so record the needed information.
     */
    public void drawText(Graphics2D g) {
        mHasText = true;
        checkDrawingMode(g);
    }

    /**
     * The application is drawing text
     * defined by {@code TextLayout}
     * so record the needed information.
     */
    public void drawText(Graphics2D g, TextLayout textLayout) {
        mHasText = true;
        checkDrawingMode(g);
    }

    /**
     * The application is drawing the passed
     * in image.
     */
    public void drawImage(Graphics2D g, Image image) {
        mHasImages = true;
    }

    /**
     * The application is drawing the passed
     * in image.
     */
    public void drawImage(Graphics2D g, RenderedImage image) {
        mHasImages = true;
    }

    /**
     * The application is drawing the passed
     * in image.
     */
    public void drawImage(Graphics2D g, RenderableImage image) {
        mHasImages = true;
    }

    /**
     * Record information about the current paint
     * and composite.
     */
    private void checkDrawingMode(Graphics2D g) {

        checkPaint(g.getPaint());
        checkAlpha(g.getComposite());

    }

    /**
     * Record information about drawing done
     * with the supplied {@code Paint}.
     */
    private void checkPaint(Paint paint) {

        if (paint instanceof Color) {
            if (((Color)paint).getAlpha() < 255) {
                mHasNonSolidColors = true;
            }
        } else {
            mHasNonSolidColors = true;
        }
    }

    /**
     * Record information about drawing done
     * with the supplied {@code Composite}.
     */

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