pv/logicsignal.cpp

   1 /*
   2  * This file is part of the PulseView project.
   3  *
   4  * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  19  */
  20
  21 #include <math.h>
  22
  23 #include "extdef.h"
  24
  25 #include "logicdata.h"
  26 #include "logicdatasnapshot.h"
  27 #include "logicsignal.h"
  28
  29 using namespace boost;
  30 using namespace std;
  31
  32 namespace pv {
  33
  34 const float LogicSignal::Margin = 10.0f;
  35 const float LogicSignal::Oversampling = 2.0f;
  36
  37 const QColor LogicSignal::EdgeColour(0x80, 0x80, 0x80);
  38 const QColor LogicSignal::HighColour(0x00, 0xC0, 0x00);
  39 const QColor LogicSignal::LowColour(0xC0, 0x00, 0x00);
  40
  41 const QColor LogicSignal::LogicSignalColours[10] = {
  42         QColor(0x16, 0x19, 0x1A),       // Black
  43         QColor(0x8F, 0x52, 0x02),       // Brown
  44         QColor(0xCC, 0x00, 0x00),       // Red
  45         QColor(0xF5, 0x79, 0x00),       // Orange
  46         QColor(0xED, 0xD4, 0x00),       // Yellow
  47         QColor(0x73, 0xD2, 0x16),       // Green
  48         QColor(0x34, 0x65, 0xA4),       // Blue
  49         QColor(0x75, 0x50, 0x7B),       // Violet
  50         QColor(0x88, 0x8A, 0x85),       // Grey
  51         QColor(0xEE, 0xEE, 0xEC),       // White
  52 };
  53
  54 LogicSignal::LogicSignal(QString name, shared_ptr<LogicData> data,
  55         int probe_index) :
  56         Signal(name),
  57         _data(data),
  58         _probe_index(probe_index)
  59 {
  60         assert(_probe_index >= 0);
  61 }
  62
  63 void LogicSignal::paint(QPainter &p, const QRect &rect, double scale,
  64         double offset)
  65 {
  66         QLineF *line;
  67
  68         vector< pair<int64_t, bool> > edges;
  69
  70         assert(scale > 0);
  71         assert(_data);
  72
  73         const float high_offset = rect.top() + Margin;
  74         const float low_offset = rect.bottom() - Margin;
  75
  76         const deque< shared_ptr<LogicDataSnapshot> > &snapshots =
  77                 _data->get_snapshots();
  78         if(snapshots.empty())
  79                 return;
  80
  81         const shared_ptr<LogicDataSnapshot> &snapshot = snapshots.front();
  82
  83         const double pixels_offset = offset / scale;
  84         const double samplerate = _data->get_samplerate();
  85         const double start_time = _data->get_start_time();
  86         const int64_t last_sample = snapshot->get_sample_count() - 1;
  87         const double samples_per_pixel = samplerate * scale;
  88         const double start = samplerate * (offset - start_time);
  89         const double end = start + samples_per_pixel * rect.width();
  90
  91         snapshot->get_subsampled_edges(edges,
  92                 min(max((int64_t)floor(start), (int64_t)0), last_sample),
  93                 min(max((int64_t)ceil(end), (int64_t)0), last_sample),
  94                 samples_per_pixel / Oversampling, _probe_index);
  95         assert(edges.size() >= 2);
  96
  97         // Paint the edges
  98         const unsigned int edge_count = edges.size() - 2;
  99         QLineF *const edge_lines = new QLineF[edge_count];
 100         line = edge_lines;
 101
 102         for(vector<LogicDataSnapshot::EdgePair>::const_iterator i =
 103                         edges.begin() + 1;
 104                 i != edges.end() - 1; i++) {
 105                 const int x = (int)((*i).first / samples_per_pixel -
 106                         pixels_offset) + rect.left();
 107                 *line++ = QLineF(x, high_offset, x, low_offset);
 108         }
 109
 110         p.setPen(EdgeColour);
 111         p.drawLines(edge_lines, edge_count);
 112         delete[] edge_lines;
 113
 114         // Paint the caps
 115         const unsigned int max_cap_line_count = (edges.size() - 1);
 116         QLineF *const cap_lines = new QLineF[max_cap_line_count];
 117
 118         p.setPen(HighColour);
 119         paint_caps(p, cap_lines, edges, true, samples_per_pixel,
 120                 pixels_offset, rect.left(), high_offset);
 121         p.setPen(LowColour);
 122         paint_caps(p, cap_lines, edges, false, samples_per_pixel,
 123                 pixels_offset, rect.left(), low_offset);
 124
 125         delete[] cap_lines;
 126 }
 127
 128 int LogicSignal::paint_caps(QPainter &p, QLineF *const lines,
 129         vector< pair<int64_t, bool> > &edges, bool level,
 130         double samples_per_pixel, double pixels_offset, int x_offset,
 131         int y_offset)
 132 {
 133         QLineF *line = lines;
 134
 135         for(vector<LogicDataSnapshot::EdgePair>::const_iterator i = edges.begin();
 136             i != (edges.end() - 1); i++)
 137                 if((*i).second == level) {
 138                         *line++ = QLineF(
 139                                 (int)((*i).first / samples_per_pixel -
 140                                         pixels_offset) + x_offset, y_offset,
 141                                 (int)((*(i+1)).first / samples_per_pixel -
 142                                         pixels_offset) + x_offset, y_offset);
 143                 }
 144
 145         p.drawLines(lines, line - lines);
 146 }
 147
 148 QColor LogicSignal::get_colour() const
 149 {
 150         return LogicSignalColours[_probe_index % countof(LogicSignalColours)];
 151 }
 152
 153 int LogicSignal::get_nominal_offset(const QRect &rect) const
 154 {
 155         return rect.bottom() - Margin;
 156 }
 157
 158 } // namespace pv