Engauge Digitizer  2
DlgFilterWorker.cpp
1 /******************************************************************************************************
2  * (C) 2014 markummitchell@github.com. This file is part of Engauge Digitizer, which is released *
3  * under GNU General Public License version 2 (GPLv2) or (at your option) any later version. See file *
4  * LICENSE or go to gnu.org/licenses for details. Distribution requires prior written permission. *
5  ******************************************************************************************************/
6 
7 #include "ColorFilter.h"
8 #include "DlgFilterWorker.h"
9 #include "Logger.h"
10 #include <QImage>
11 
12 const int NO_DELAY = 0;
13 const int COLUMNS_PER_PIECE = 5;
14 
15 DlgFilterWorker::DlgFilterWorker(const QPixmap &pixmapOriginal,
16  QRgb rgbBackground) :
17  m_imageOriginal (pixmapOriginal.toImage()),
18  m_rgbBackground (rgbBackground),
19  m_colorFilterMode (NUM_COLOR_FILTER_MODES),
20  m_low (-1.0),
21  m_high (-1.0)
22 {
23  m_restartTimer.setSingleShot (false);
24  connect (&m_restartTimer, SIGNAL (timeout ()), this, SLOT (slotRestartTimeout()));
25 }
26 
27 void DlgFilterWorker::slotNewParameters (ColorFilterMode colorFilterMode,
28  double low,
29  double high)
30 {
31  LOG4CPP_INFO_S ((*mainCat)) << "DlgFilterWorker::slotNewParameters filterMode=" << colorFilterMode
32  << " low=" << low
33  << " high=" << high;
34 
35  // Push onto queue
36  DlgFilterCommand command (colorFilterMode,
37  low,
38  high);
39  m_inputCommandQueue.push_back (command);
40 
41  if (!m_restartTimer.isActive()) {
42 
43  // Timer is not currently active so start it up
44  m_restartTimer.start (NO_DELAY);
45  }
46 }
47 
48 void DlgFilterWorker::slotRestartTimeout ()
49 {
50  if (m_inputCommandQueue.count() > 0) {
51 
52  DlgFilterCommand command = m_inputCommandQueue.last();
53  m_inputCommandQueue.clear ();
54 
55  // Start over from the left side
56  m_colorFilterMode = command.colorFilterMode();
57  m_low = command.low0To1();
58  m_high = command.high0To1();
59 
60  m_xLeft = 0;
61 
62  // Start timer to process first piece
63  m_restartTimer.start (NO_DELAY);
64 
65  } else if (m_xLeft < m_imageOriginal.width ()) {
66 
67  // To to process a new piece, starting at m_xLeft
68  int xStop = m_xLeft + COLUMNS_PER_PIECE;
69  if (xStop >= m_imageOriginal.width()) {
70  xStop = m_imageOriginal.width();
71  }
72 
73  // From here on, if a new command gets pushed onto the queue then we immediately stop processing
74  // and do nothing except start the timer so we can start over after the next timeout. The goal is
75  // to not tie up the gui by emitting signalTransferPiece unnecessarily.
76  //
77  // This code is basically a heavily customized version of ColorFilter::filterImage
78  ColorFilter filter;
79  int processedWidth = xStop - m_xLeft;
80  QImage imageProcessed (processedWidth,
81  m_imageOriginal.height(),
82  QImage::Format_RGB32);
83  for (int xFrom = m_xLeft, xTo = 0; (xFrom < xStop) && (m_inputCommandQueue.count() == 0); xFrom++, xTo++) {
84  for (int y = 0; (y < m_imageOriginal.height ()) && (m_inputCommandQueue.count() == 0); y++) {
85  QColor pixel = m_imageOriginal.pixel (xFrom, y);
86  bool isOn = false;
87  if (pixel.rgb() != m_rgbBackground) {
88 
89  isOn = filter.pixelUnfilteredIsOn (m_colorFilterMode,
90  pixel,
91  m_rgbBackground,
92  m_low,
93  m_high);
94  }
95 
96  imageProcessed.setPixel (xTo, y, (isOn ?
97  QColor (Qt::black).rgb () :
98  QColor (Qt::white).rgb ()));
99  }
100  }
101 
102  if (m_inputCommandQueue.count() == 0) {
103  emit signalTransferPiece (m_xLeft,
104  imageProcessed);
105  m_xLeft += processedWidth;
106  }
107 
108  if ((xStop < m_imageOriginal.width()) ||
109  (m_inputCommandQueue.count () > 0)) {
110 
111  // Restart timer to process next piece
112  m_restartTimer.start (NO_DELAY);
113  }
114  }
115 }
ColorFilterMode colorFilterMode() const
Get method for filter mode.
Command pattern object for receiving new parameters in DlgFilterWorker from GUI thread.
double high0To1() const
Get method for high value.
double low0To1() const
Get method for low value.
Class for filtering image to remove unimportant information.
Definition: ColorFilter.h:20
void slotNewParameters(ColorFilterMode colorFilterMode, double low, double high)
Start processing with a new set of parameters. Any ongoing processing is interrupted when m_filterMod...
void signalTransferPiece(int xLeft, QImage image)
Send a processed vertical piece of the original pixmap. The destination is between xLeft and xLeft+pi...
bool pixelUnfilteredIsOn(ColorFilterMode colorFilterMode, const QColor &pixel, QRgb rgbBackground, double low0To1, double high0To1) const
Return true if specified unfiltered pixel is on.
DlgFilterWorker(const QPixmap &pixmapOriginal, QRgb m_rgbBackground)
Single constructor.