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 
26 package sun.java2d.xr;
27 
28 import java.awt.*;
29 import java.awt.geom.*;
30 
31 /**
32  *  Management of mask used for some blit-types.
33  *
34  * @author Clemens Eisserer
35  */
36 
37 public 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 
XRMaskImage(XRCompositeManager xrMgr, int parentDrawable)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      */
prepareBlitMask(XRSurfaceData dst, AffineTransform maskTX, int width, int height)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 
initBlitMask(int parentDrawable, int width, int height)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 
ensureBlitMaskSize(int minSizeX, int minSizeY)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