pv/view/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 <extdef.h>
  22
  23 #include <math.h>
  24
  25 #include "logicsignal.h"
  26 #include "pv/data/logic.h"
  27 #include "pv/data/logicsnapshot.h"
  28
  29 using namespace boost;
  30 using namespace std;
  31
  32 namespace pv {
  33 namespace view {
  34
  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<data::Logic> data,
  55         int probe_index) :
  56         Signal(name),
  57         _probe_index(probe_index),
  58         _data(data)
  59 {
  60         assert(_probe_index >= 0);
  61         _colour = LogicSignalColours[
  62                 _probe_index % countof(LogicSignalColours)];
  63 }
  64
  65 void LogicSignal::paint(QPainter &p, const QRect &rect, double scale,
  66         double offset)
  67 {
  68         QLineF *line;
  69
  70         vector< pair<int64_t, bool> > edges;
  71
  72         assert(scale > 0);
  73         assert(_data);
  74
  75         const float high_offset = rect.top() + 0.5f;
  76         const float low_offset = rect.bottom() + 0.5f;
  77
  78         const deque< shared_ptr<pv::data::LogicSnapshot> > &snapshots =
  79                 _data->get_snapshots();
  80         if (snapshots.empty())
  81                 return;
  82
  83         const shared_ptr<pv::data::LogicSnapshot> &snapshot =
  84                 snapshots.front();
  85
  86         const double pixels_offset = offset / scale;
  87         const double samplerate = _data->get_samplerate();
  88         const double start_time = _data->get_start_time();
  89         const int64_t last_sample = snapshot->get_sample_count() - 1;
  90         const double samples_per_pixel = samplerate * scale;
  91         const double start = samplerate * (offset - start_time);
  92         const double end = start + samples_per_pixel * rect.width();
  93
  94         snapshot->get_subsampled_edges(edges,
  95                 min(max((int64_t)floor(start), (int64_t)0), last_sample),
  96                 min(max((int64_t)ceil(end), (int64_t)0), last_sample),
  97                 samples_per_pixel / Oversampling, _probe_index);
  98         assert(edges.size() >= 2);
  99
 100         // Paint the edges
 101         const unsigned int edge_count = edges.size() - 2;
 102         QLineF *const edge_lines = new QLineF[edge_count];
 103         line = edge_lines;
 104
 105         for (vector<pv::data::LogicSnapshot::EdgePair>::const_iterator i =
 106                         edges.begin() + 1;
 107                 i != edges.end() - 1; i++) {
 108                 const float x = ((*i).first / samples_per_pixel -
 109                         pixels_offset) + rect.left();
 110                 *line++ = QLineF(x, high_offset, x, low_offset);
 111         }
 112
 113         p.setPen(EdgeColour);
 114         p.drawLines(edge_lines, edge_count);
 115         delete[] edge_lines;
 116
 117         // Paint the caps
 118         const unsigned int max_cap_line_count = (edges.size() - 1);
 119         QLineF *const cap_lines = new QLineF[max_cap_line_count];
 120
 121         p.setPen(HighColour);
 122         paint_caps(p, cap_lines, edges, true, samples_per_pixel,
 123                 pixels_offset, rect.left(), high_offset);
 124         p.setPen(LowColour);
 125         paint_caps(p, cap_lines, edges, false, samples_per_pixel,
 126                 pixels_offset, rect.left(), low_offset);
 127
 128         delete[] cap_lines;
 129 }
 130
 131 void LogicSignal::paint_caps(QPainter &p, QLineF *const lines,
 132         vector< pair<int64_t, bool> > &edges, bool level,
 133         double samples_per_pixel, double pixels_offset, float x_offset,
 134         float y_offset)
 135 {
 136         QLineF *line = lines;
 137
 138         for (vector<pv::data::LogicSnapshot::EdgePair>::const_iterator i =
 139                 edges.begin(); i != (edges.end() - 1); i++)
 140                 if ((*i).second == level) {
 141                         *line++ = QLineF(
 142                                 ((*i).first / samples_per_pixel -
 143                                         pixels_offset) + x_offset, y_offset,
 144                                 ((*(i+1)).first / samples_per_pixel -
 145                                         pixels_offset) + x_offset, y_offset);
 146                 }
 147
 148         p.drawLines(lines, line - lines);
 149 }
 150
 151 int LogicSignal::get_nominal_offset(const QRect &rect) const
 152 {
 153         return rect.bottom();
 154 }
 155
 156 } // namespace view
 157 } // namespace pv