Clean up ChunkedUpdateDrawingAreaProxy
[WebKit-https.git] / Tools / DumpRenderTree / qt / ImageDiff.cpp
1 /*
2     Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies)
3
4     This library is free software; you can redistribute it and/or
5     modify it under the terms of the GNU Library General Public
6     License as published by the Free Software Foundation; either
7     version 2 of the License, or (at your option) any later version.
8
9     This library is distributed in the hope that it will be useful,
10     but WITHOUT ANY WARRANTY; without even the implied warranty of
11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12     Library General Public License for more details.
13
14     You should have received a copy of the GNU Library General Public License
15     along with this library; see the file COPYING.LIB.  If not, write to
16     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17     Boston, MA 02110-1301, USA.
18 */
19
20 #include <QtCore/qmath.h>
21
22 #include <QApplication>
23 #include <QBuffer>
24 #include <QByteArray>
25 #include <QImage>
26 #include <QStringList>
27
28 #include <stdio.h>
29
30 int main(int argc, char* argv[])
31 {
32     QCoreApplication app(argc, argv);
33
34     qreal tolerance = 0;
35
36     QStringList args = app.arguments();
37     for (int i = 0; i < argc; ++i)
38         if (args[i] == "-t" || args[i] == "--tolerance")
39             tolerance = args[i + 1].toDouble();
40
41     char buffer[2048];
42     QImage actualImage;
43     QImage baselineImage;
44
45     while (fgets(buffer, sizeof(buffer), stdin)) {
46         // remove the CR
47         char* newLineCharacter = strchr(buffer, '\n');
48         if (newLineCharacter)
49             *newLineCharacter = '\0';
50
51         if (!strncmp("Content-Length: ", buffer, 16)) {
52             strtok(buffer, " ");
53             int imageSize = strtol(strtok(0, " "), 0, 10);
54
55             if (imageSize <= 0) {
56                 fputs("error, image size must be specified.\n", stdout);
57             } else {
58                 unsigned char buffer[2048];
59                 QBuffer data;
60
61                 // Read all the incoming chunks
62                 data.open(QBuffer::WriteOnly);
63                 while (imageSize > 0) {
64                     size_t bytesToRead = qMin(imageSize, 2048);
65                     size_t bytesRead = fread(buffer, 1, bytesToRead, stdin);
66                     data.write(reinterpret_cast<const char*>(buffer), bytesRead);
67                     imageSize -= static_cast<int>(bytesRead);
68                 }
69
70                 // Convert into QImage
71                 QImage decodedImage;
72                 decodedImage.loadFromData(data.data(), "PNG");
73                 decodedImage.convertToFormat(QImage::Format_ARGB32);
74
75                 // Place it in the right place
76                 if (actualImage.isNull())
77                     actualImage = decodedImage;
78                 else
79                     baselineImage = decodedImage;
80             }
81         }
82
83         if (!actualImage.isNull() && !baselineImage.isNull()) {
84
85             if (actualImage.size() != baselineImage.size()) {
86                 fprintf(stderr, "error, test and reference image have different properties.\n");
87                 fflush(stderr);
88             } else {
89
90                 int w = actualImage.width();
91                 int h = actualImage.height();
92                 QImage diffImage(w, h, QImage::Format_ARGB32);
93
94                 int count = 0;
95                 qreal sum = 0;
96                 qreal maxDistance = 0;
97
98                 for (int x = 0; x < w; ++x)
99                     for (int y = 0; y < h; ++y) {
100                         QRgb pixel = actualImage.pixel(x, y);
101                         QRgb basePixel = baselineImage.pixel(x, y);
102                         qreal red = (qRed(pixel) - qRed(basePixel)) / static_cast<float>(qMax(255 - qRed(basePixel), qRed(basePixel)));
103                         qreal green = (qGreen(pixel) - qGreen(basePixel)) / static_cast<float>(qMax(255 - qGreen(basePixel), qGreen(basePixel)));
104                         qreal blue = (qBlue(pixel) - qBlue(basePixel)) / static_cast<float>(qMax(255 - qBlue(basePixel), qBlue(basePixel)));
105                         qreal alpha = (qAlpha(pixel) - qAlpha(basePixel)) / static_cast<float>(qMax(255 - qAlpha(basePixel), qAlpha(basePixel)));
106                         qreal distance = qSqrt(red * red + green * green + blue * blue + alpha * alpha) / 2.0f;
107                         int gray = distance * qreal(255);
108                         diffImage.setPixel(x, y, qRgb(gray, gray, gray));
109                         if (distance >= 1 / qreal(255)) {
110                             count++;
111                             sum += distance;
112                             maxDistance = qMax(maxDistance, distance);
113                         }
114                 }
115
116                 qreal difference = 0;
117                 if (count)
118                     difference = 100 * sum / static_cast<qreal>(w * h);
119                 if (difference <= tolerance) {
120                     difference = 0;
121                 } else {
122                     difference = qRound(difference * 100) / 100;
123                     difference = qMax(difference, qreal(0.01));
124                 }
125
126                 if (!count) {
127                     fprintf(stdout, "diff: %01.2f%% passed\n", difference);
128                 } else {
129                     QBuffer buffer;
130                     buffer.open(QBuffer::WriteOnly);
131                     diffImage.save(&buffer, "PNG");
132                     buffer.close();
133                     const QByteArray &data = buffer.data();
134                     printf("Content-Length: %lu\n", static_cast<unsigned long>(data.length()));
135
136                     // We have to use the return value of fwrite to avoid "ignoring return value" gcc warning
137                     // See https://bugs.webkit.org/show_bug.cgi?id=45384 for details.
138                     if (fwrite(data.constData(), 1, data.length(), stdout)) {}
139
140                     fprintf(stdout, "diff: %01.2f%% failed\n", difference);
141                 }
142
143                 fflush(stdout);
144             }
145         }
146     }
147
148     return 0;
149 }