1/*
2 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package sun.java2d.xr;
27
28import java.awt.*;
29import java.awt.geom.*;
30
31/**
32 *  Management of mask used for some blit-types.
33 *
34 * @author Clemens Eisserer
35 */
36
37public class XRMaskImage {
38
39    private static final int MASK_SCALE_FACTOR = 8;
40
41    private static final int BLIT_MASK_SIZE = 8;
42
43    Dimension blitMaskDimensions = new Dimension(BLIT_MASK_SIZE, BLIT_MASK_SIZE);
44    int blitMaskPixmap;
45    int blitMaskPicture;
46    int lastMaskWidth = 0;
47    int lastMaskHeight = 0;
48    int lastEA = -1;
49    AffineTransform lastMaskTransform;
50
51    XRCompositeManager xrMgr;
52    XRBackend con;
53
54    public XRMaskImage(XRCompositeManager xrMgr, int parentDrawable) {
55        this.xrMgr = xrMgr;
56        this.con = xrMgr.getBackend();
57
58        initBlitMask(parentDrawable, BLIT_MASK_SIZE, BLIT_MASK_SIZE);
59    }
60
61
62    /**
63     * Prepares a mask used by a TransformedBlit, fills mask-contents and applies
64     * transformation.
65     */
66    public int prepareBlitMask(XRSurfaceData dst, AffineTransform maskTX, int width,
67            int height) {
68
69        int maskWidth = Math.max(width / MASK_SCALE_FACTOR, 1);
70        int maskHeight = Math.max(height / MASK_SCALE_FACTOR, 1);
71        maskTX.scale(((double) width) / maskWidth, ((double) height) / maskHeight);
72
73        try {
74            maskTX.invert();
75        } catch (NoninvertibleTransformException ex) {
76            maskTX.setToIdentity();
77        }
78
79        ensureBlitMaskSize(maskWidth, maskHeight);
80
81        if (lastMaskTransform == null || !lastMaskTransform.equals(maskTX)) {
82                con.setPictureTransform(blitMaskPicture, maskTX);
83                lastMaskTransform = maskTX;
84        }
85
86        int currentEA = xrMgr.getAlphaColor().getAlpha();
87        if (lastMaskWidth != maskWidth || lastMaskHeight != maskHeight || lastEA != currentEA)  {
88            //Only clear mask, if previous mask area is larger than new one, otherwise simple overpaint it
89            if (lastMaskWidth > maskWidth || lastMaskHeight > maskHeight)  {
90                con.renderRectangle(blitMaskPicture, XRUtils.PictOpClear, XRColor.NO_ALPHA, 0, 0, lastMaskWidth, lastMaskHeight);
91            }
92
93            con.renderRectangle(blitMaskPicture, XRUtils.PictOpSrc, xrMgr.getAlphaColor(), 0, 0, maskWidth, maskHeight);
94            lastEA = currentEA;
95        }
96
97        lastMaskWidth = maskWidth;
98        lastMaskHeight = maskHeight;
99
100        return blitMaskPicture;
101    }
102
103    private void initBlitMask(int parentDrawable, int width, int height) {
104        int newPM = con.createPixmap(parentDrawable, 8, width, height);
105        int newPict = con.createPicture(newPM, XRUtils.PictStandardA8);
106
107        /*Free old mask*/
108        if (blitMaskPixmap != 0) {
109            con.freePixmap(blitMaskPixmap);
110            con.freePicture(blitMaskPicture);
111        }
112
113        blitMaskPixmap = newPM;
114        blitMaskPicture = newPict;
115
116        con.renderRectangle(blitMaskPicture, XRUtils.PictOpClear, XRColor.NO_ALPHA, 0, 0, width, height);
117
118        blitMaskDimensions.width = width;
119        blitMaskDimensions.height = height;
120        lastMaskWidth = 0;
121        lastMaskHeight = 0;
122        lastMaskTransform = null;
123    }
124
125    private void ensureBlitMaskSize(int minSizeX, int minSizeY) {
126        if (minSizeX > blitMaskDimensions.width || minSizeY > blitMaskDimensions.height) {
127            int newWidth = Math.max(minSizeX, blitMaskDimensions.width);
128            int newHeight = Math.max(minSizeY, blitMaskDimensions.height);
129            initBlitMask(blitMaskPixmap, newWidth, newHeight);
130        }
131    }
132}
133