GLExtras.cpp revision 9e3ead124cc10fcc888a8be7df9949d3d4ba1bb7 
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#include "android_graphics.h"
39
40// Touch ring border width. This is doubled if the ring is not pressed
41#define RING_BORDER_WIDTH 1
42
43GLExtras::GLExtras()
44    : m_drawExtra(0)
45    , m_visibleContentRect()
46{
47}
48
49GLExtras::~GLExtras()
50{
51}
52
53void GLExtras::drawRing(SkRect& srcRect, Color color, const TransformationMatrix* drawMat)
54{
55    if (srcRect.fRight <= srcRect.fLeft || srcRect.fBottom <= srcRect.fTop) {
56        // Invalid rect, reject it
57        return;
58    }
59    ALOGV("drawQuad [%fx%f, %f, %f]", srcRect.fLeft, srcRect.fTop,
60          srcRect.width(), srcRect.height());
61    // Pull the alpha out of the color so that the shader applies it correctly.
62    // Otherwise we either don't have blending enabled, or the alpha will get
63    // double applied
64    Color colorWithoutAlpha(0xFF000000 | color.rgb());
65    float alpha = color.alpha() / (float) 255;
66
67    PureColorQuadData data(colorWithoutAlpha, drawMat ? LayerQuad : BaseQuad,
68                           drawMat, &srcRect, alpha, false);
69    TilesManager::instance()->shader()->drawQuad(&data);
70}
71
72void GLExtras::drawRegion(const SkRegion& region, bool fill, bool drawBorder,
73                          const TransformationMatrix* drawMat, Color color)
74{
75    if (region.isEmpty())
76        return;
77    if (fill) {
78        SkRegion::Iterator rgnIter(region);
79        while (!rgnIter.done()) {
80            const SkIRect& ir = rgnIter.rect();
81            SkRect r;
82            r.set(ir.fLeft, ir.fTop, ir.fRight, ir.fBottom);
83            drawRing(r, color, drawMat);
84            rgnIter.next();
85        }
86    }
87    if (fill && !drawBorder)
88        return;
89    SkPath path;
90    if (!region.getBoundaryPath(&path))
91        return;
92    SkPath::Iter iter(path, true);
93    SkPath::Verb verb;
94    SkPoint pts[4];
95    SkRegion clip;
96    SkIRect startRect;
97    while ((verb = iter.next(pts)) != SkPath::kDone_Verb) {
98        if (verb == SkPath::kLine_Verb) {
99            SkRect r;
100            r.set(pts, 2);
101            SkIRect line;
102            int borderWidth = RING_BORDER_WIDTH;
103            if (!fill)
104                borderWidth *= 2;
105            line.fLeft = r.fLeft - borderWidth;
106            line.fRight = r.fRight + borderWidth;
107            line.fTop = r.fTop - borderWidth;
108            line.fBottom = r.fBottom + borderWidth;
109            if (clip.intersects(line)) {
110                clip.op(line, SkRegion::kReverseDifference_Op);
111                if (clip.isEmpty())
112                    continue; // Nothing to draw, continue
113                line = clip.getBounds();
114                if (SkIRect::Intersects(startRect, line)) {
115                    clip.op(startRect, SkRegion::kDifference_Op);
116                    if (clip.isEmpty())
117                        continue; // Nothing to draw, continue
118                    line = clip.getBounds();
119                }
120            } else {
121                clip.setRect(line);
122            }
123            r.set(line.fLeft, line.fTop, line.fRight, line.fBottom);
124            drawRing(r, color, drawMat);
125            if (startRect.isEmpty()) {
126                startRect.set(line.fLeft, line.fTop, line.fRight, line.fBottom);
127            }
128        }
129        if (verb == SkPath::kMove_Verb) {
130            startRect.setEmpty();
131        }
132    }
133}
134
135void GLExtras::drawGL(const LayerAndroid* layer)
136{
137    if (m_drawExtra)
138        m_drawExtra->drawGL(this, layer);
139}
140