Engauge Digitizer 2
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DlgFilterWorker.cpp
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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
12const int NO_DELAY = 0;
13const int COLUMNS_PER_PIECE = 5;
14
15DlgFilterWorker::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
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
48void 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
@ NUM_COLOR_FILTER_MODES
const int NO_DELAY
const int COLUMNS_PER_PIECE
log4cpp::Category * mainCat
Definition Logger.cpp:14
Class for filtering image to remove unimportant information.
Definition ColorFilter.h:21
bool pixelUnfilteredIsOn(ColorFilterMode colorFilterMode, const QColor &pixel, QRgb rgbBackground, double low0To1, double high0To1) const
Return true if specified unfiltered pixel is on.
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.
ColorFilterMode colorFilterMode() const
Get method for filter mode.
void signalTransferPiece(int xLeft, QImage image)
Send a processed vertical piece of the original pixmap. The destination is between xLeft and xLeft+pi...
DlgFilterWorker(const QPixmap &pixmapOriginal, QRgb m_rgbBackground)
Single constructor.
void slotNewParameters(ColorFilterMode colorFilterMode, double low, double high)
Start processing with a new set of parameters. Any ongoing processing is interrupted when m_filterMod...
#define LOG4CPP_INFO_S(logger)
Definition convenience.h:18