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1 /*
2  * Copyright 2011, The Android Open Source Project
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions
6  * are met:
7  *  * Redistributions of source code must retain the above copyright
8  *    notice, this list of conditions and the following disclaimer.
9  *  * Redistributions in binary form must reproduce the above copyright
10  *    notice, this list of conditions and the following disclaimer in the
11  *    documentation and/or other materials provided with the distribution.
12  *
13  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24  */
25 
26 #define LOG_TAG "GLExtras"
27 #define LOG_NDEBUG 1
28 
29 #include "config.h"
30 
31 #include "AndroidLog.h"
32 #include "DrawExtra.h"
33 #include "DrawQuadData.h"
34 #include "GLExtras.h"
35 #include "IntRect.h"
36 #include "SkPath.h"
37 #include "TilesManager.h"
38 
39 // Touch ring border width. This is doubled if the ring is not pressed
40 #define RING_BORDER_WIDTH 1
41 
GLExtras()42 GLExtras::GLExtras()
43     : m_drawExtra(0)
44     , m_visibleContentRect()
45 {
46 }
47 
~GLExtras()48 GLExtras::~GLExtras()
49 {
50 }
51 
drawRing(SkRect & srcRect,Color color,const TransformationMatrix * drawMat)52 void GLExtras::drawRing(SkRect& srcRect, Color color, const TransformationMatrix* drawMat)
53 {
54     if (srcRect.fRight <= srcRect.fLeft || srcRect.fBottom <= srcRect.fTop) {
55         // Invalid rect, reject it
56         return;
57     }
58     ALOGV("drawQuad [%fx%f, %f, %f]", srcRect.fLeft, srcRect.fTop,
59           srcRect.width(), srcRect.height());
60     // Pull the alpha out of the color so that the shader applies it correctly.
61     // Otherwise we either don't have blending enabled, or the alpha will get
62     // double applied
63     Color colorWithoutAlpha(0xFF000000 | color.rgb());
64     float alpha = color.alpha() / (float) 255;
65 
66     PureColorQuadData data(colorWithoutAlpha, drawMat ? LayerQuad : BaseQuad,
67                            drawMat, &srcRect, alpha, false);
68     TilesManager::instance()->shader()->drawQuad(&data);
69 }
70 
drawRegion(const SkRegion & region,bool fill,bool drawBorder,const TransformationMatrix * drawMat,Color color)71 void GLExtras::drawRegion(const SkRegion& region, bool fill, bool drawBorder,
72                           const TransformationMatrix* drawMat, Color color)
73 {
74     if (region.isEmpty())
75         return;
76     if (fill) {
77         SkRegion::Iterator rgnIter(region);
78         while (!rgnIter.done()) {
79             const SkIRect& ir = rgnIter.rect();
80             SkRect r;
81             r.set(ir.fLeft, ir.fTop, ir.fRight, ir.fBottom);
82             drawRing(r, color, drawMat);
83             rgnIter.next();
84         }
85     }
86     if (fill && !drawBorder)
87         return;
88     SkPath path;
89     if (!region.getBoundaryPath(&path))
90         return;
91     SkPath::Iter iter(path, true);
92     SkPath::Verb verb;
93     SkPoint pts[4];
94     SkRegion clip;
95     SkIRect startRect;
96     while ((verb = iter.next(pts)) != SkPath::kDone_Verb) {
97         if (verb == SkPath::kLine_Verb) {
98             SkRect r;
99             r.set(pts, 2);
100             SkIRect line;
101             int borderWidth = RING_BORDER_WIDTH;
102             if (!fill)
103                 borderWidth *= 2;
104             line.fLeft = r.fLeft - borderWidth;
105             line.fRight = r.fRight + borderWidth;
106             line.fTop = r.fTop - borderWidth;
107             line.fBottom = r.fBottom + borderWidth;
108             if (clip.intersects(line)) {
109                 clip.op(line, SkRegion::kReverseDifference_Op);
110                 if (clip.isEmpty())
111                     continue; // Nothing to draw, continue
112                 line = clip.getBounds();
113                 if (SkIRect::Intersects(startRect, line)) {
114                     clip.op(startRect, SkRegion::kDifference_Op);
115                     if (clip.isEmpty())
116                         continue; // Nothing to draw, continue
117                     line = clip.getBounds();
118                 }
119             } else {
120                 clip.setRect(line);
121             }
122             r.set(line.fLeft, line.fTop, line.fRight, line.fBottom);
123             drawRing(r, color, drawMat);
124             if (startRect.isEmpty()) {
125                 startRect.set(line.fLeft, line.fTop, line.fRight, line.fBottom);
126             }
127         }
128         if (verb == SkPath::kMove_Verb) {
129             startRect.setEmpty();
130         }
131     }
132 }
133 
drawGL(const LayerAndroid * layer)134 void GLExtras::drawGL(const LayerAndroid* layer)
135 {
136     if (m_drawExtra)
137         m_drawExtra->drawGL(this, layer);
138 }
139