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1 /*
2  * Copyright (C) 2013 Google Inc. All rights reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions are
6  * met:
7  *
8  *     * Redistributions of source code must retain the above copyright
9  * notice, this list of conditions and the following disclaimer.
10  *     * Redistributions in binary form must reproduce the above
11  * copyright notice, this list of conditions and the following disclaimer
12  * in the documentation and/or other materials provided with the
13  * distribution.
14  *     * Neither the name of Google Inc. nor the names of its
15  * contributors may be used to endorse or promote products derived from
16  * this software without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29  */
30 
31 #include "config.h"
32 #include "platform/graphics/GraphicsContextRecorder.h"
33 
34 #include "platform/graphics/ImageBuffer.h"
35 #include "platform/graphics/ImageSource.h"
36 #include "platform/graphics/LoggingCanvas.h"
37 #include "platform/graphics/ProfilingCanvas.h"
38 #include "platform/graphics/ReplayingCanvas.h"
39 #include "platform/image-decoders/ImageDecoder.h"
40 #include "platform/image-decoders/ImageFrame.h"
41 #include "platform/image-encoders/skia/PNGImageEncoder.h"
42 #include "third_party/skia/include/core/SkBitmapDevice.h"
43 #include "third_party/skia/include/core/SkPictureRecorder.h"
44 #include "third_party/skia/include/core/SkStream.h"
45 #include "wtf/HexNumber.h"
46 #include "wtf/text/Base64.h"
47 #include "wtf/text/TextEncoding.h"
48 
49 namespace blink {
50 
record(const IntSize & size,bool isCertainlyOpaque)51 GraphicsContext* GraphicsContextRecorder::record(const IntSize& size, bool isCertainlyOpaque)
52 {
53     ASSERT(!m_picture);
54     ASSERT(!m_recorder);
55     ASSERT(!m_context);
56     m_isCertainlyOpaque = isCertainlyOpaque;
57     m_recorder = adoptPtr(new SkPictureRecorder);
58     SkCanvas* canvas = m_recorder->beginRecording(size.width(), size.height(), 0, 0);
59     m_context = adoptPtr(new GraphicsContext(canvas));
60     m_context->setRegionTrackingMode(isCertainlyOpaque ? GraphicsContext::RegionTrackingOpaque : GraphicsContext::RegionTrackingDisabled);
61     m_context->setCertainlyOpaque(isCertainlyOpaque);
62     return m_context.get();
63 }
64 
stop()65 PassRefPtr<GraphicsContextSnapshot> GraphicsContextRecorder::stop()
66 {
67     m_context.clear();
68     m_picture = adoptRef(m_recorder->endRecording());
69     m_recorder.clear();
70     return adoptRef(new GraphicsContextSnapshot(m_picture.release()));
71 }
72 
GraphicsContextSnapshot(PassRefPtr<SkPicture> picture)73 GraphicsContextSnapshot::GraphicsContextSnapshot(PassRefPtr<SkPicture> picture)
74     : m_picture(picture)
75 {
76 }
77 
decodeBitmap(const void * data,size_t length,SkBitmap * result)78 static bool decodeBitmap(const void* data, size_t length, SkBitmap* result)
79 {
80     RefPtr<SharedBuffer> buffer = SharedBuffer::create(static_cast<const char*>(data), length);
81     OwnPtr<ImageDecoder> imageDecoder = ImageDecoder::create(*buffer, ImageSource::AlphaPremultiplied, ImageSource::GammaAndColorProfileIgnored);
82     if (!imageDecoder)
83         return false;
84     imageDecoder->setData(buffer.get(), true);
85     ImageFrame* frame = imageDecoder->frameBufferAtIndex(0);
86     if (!frame)
87         return true;
88     *result = frame->getSkBitmap();
89     return true;
90 }
91 
load(const char * data,size_t size)92 PassRefPtr<GraphicsContextSnapshot> GraphicsContextSnapshot::load(const char* data, size_t size)
93 {
94     SkMemoryStream stream(data, size);
95     RefPtr<SkPicture> picture = adoptRef(SkPicture::CreateFromStream(&stream, decodeBitmap));
96     if (!picture)
97         return nullptr;
98     return adoptRef(new GraphicsContextSnapshot(picture));
99 }
100 
replay(unsigned fromStep,unsigned toStep,double scale) const101 PassOwnPtr<Vector<char> > GraphicsContextSnapshot::replay(unsigned fromStep, unsigned toStep, double scale) const
102 {
103     int width = ceil(scale * m_picture->width());
104     int height = ceil(scale * m_picture->height());
105     SkBitmap bitmap;
106     bitmap.allocPixels(SkImageInfo::MakeN32Premul(width, height));
107     {
108         ReplayingCanvas canvas(bitmap, fromStep, toStep);
109         canvas.scale(scale, scale);
110         canvas.resetStepCount();
111         m_picture->draw(&canvas, &canvas);
112     }
113     OwnPtr<Vector<char> > base64Data = adoptPtr(new Vector<char>());
114     Vector<char> encodedImage;
115     if (!PNGImageEncoder::encode(bitmap, reinterpret_cast<Vector<unsigned char>*>(&encodedImage)))
116         return nullptr;
117     base64Encode(encodedImage, *base64Data);
118     return base64Data.release();
119 }
120 
profile(unsigned minRepeatCount,double minDuration) const121 PassOwnPtr<GraphicsContextSnapshot::Timings> GraphicsContextSnapshot::profile(unsigned minRepeatCount, double minDuration) const
122 {
123     OwnPtr<GraphicsContextSnapshot::Timings> timings = adoptPtr(new GraphicsContextSnapshot::Timings());
124     timings->reserveCapacity(minRepeatCount);
125     SkBitmap bitmap;
126     bitmap.allocPixels(SkImageInfo::MakeN32Premul(m_picture->width(), m_picture->height()));
127     OwnPtr<ProfilingCanvas> canvas = adoptPtr(new ProfilingCanvas(bitmap));
128 
129     double now = WTF::monotonicallyIncreasingTime();
130     double stopTime = now + minDuration;
131     for (unsigned step = 0; step < minRepeatCount || now < stopTime; ++step) {
132         timings->append(Vector<double>());
133         Vector<double>* currentTimings = &timings->last();
134         if (timings->size() > 1)
135             currentTimings->reserveCapacity(timings->begin()->size());
136         if (step)
137             canvas = adoptPtr(new ProfilingCanvas(bitmap));
138         canvas->setTimings(currentTimings);
139         m_picture->draw(canvas.get());
140         now = WTF::monotonicallyIncreasingTime();
141     }
142     return timings.release();
143 }
144 
snapshotCommandLog() const145 PassRefPtr<JSONArray> GraphicsContextSnapshot::snapshotCommandLog() const
146 {
147     LoggingCanvas canvas(m_picture->width(), m_picture->height());
148     m_picture->draw(&canvas);
149     return canvas.log();
150 }
151 
152 } // namespace blink
153