Use static signal offsets instead of offsets calculated on-the-fly

[pulseview.git] / pv / view / logicsignal.cpp

/*
 * This file is part of the PulseView project.
 *
 * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#include <extdef.h>

#include <math.h>

#include "logicsignal.h"
#include "../logicdata.h"
#include "../logicdatasnapshot.h"

using namespace boost;
using namespace std;

namespace pv {
namespace view {

const float LogicSignal::Margin = 10.0f;
const float LogicSignal::Oversampling = 2.0f;

const QColor LogicSignal::EdgeColour(0x80, 0x80, 0x80);
const QColor LogicSignal::HighColour(0x00, 0xC0, 0x00);
const QColor LogicSignal::LowColour(0xC0, 0x00, 0x00);

const QColor LogicSignal::LogicSignalColours[10] = {
	QColor(0x16, 0x19, 0x1A),	// Black
	QColor(0x8F, 0x52, 0x02),	// Brown
	QColor(0xCC, 0x00, 0x00),	// Red
	QColor(0xF5, 0x79, 0x00),	// Orange
	QColor(0xED, 0xD4, 0x00),	// Yellow
	QColor(0x73, 0xD2, 0x16),	// Green
	QColor(0x34, 0x65, 0xA4),	// Blue
	QColor(0x75, 0x50, 0x7B),	// Violet
	QColor(0x88, 0x8A, 0x85),	// Grey
	QColor(0xEE, 0xEE, 0xEC),	// White
};

LogicSignal::LogicSignal(QString name, shared_ptr<LogicData> data,
	int probe_index) :
	Signal(name),
	_probe_index(probe_index),
	_data(data)
{
	assert(_probe_index >= 0);
	_colour = LogicSignalColours[
		_probe_index % countof(LogicSignalColours)];
}

void LogicSignal::paint(QPainter &p, const QRect &rect, double scale,
	double offset)
{
	QLineF *line;

	vector< pair<int64_t, bool> > edges;

	assert(scale > 0);
	assert(_data);

	const float high_offset = rect.top() + Margin + 0.5f;
	const float low_offset = rect.bottom() - Margin + 0.5f;

	const deque< shared_ptr<pv::LogicDataSnapshot> > &snapshots =
		_data->get_snapshots();
	if(snapshots.empty())
		return;

	const shared_ptr<pv::LogicDataSnapshot> &snapshot =
		snapshots.front();

	const double pixels_offset = offset / scale;
	const double samplerate = _data->get_samplerate();
	const double start_time = _data->get_start_time();
	const int64_t last_sample = snapshot->get_sample_count() - 1;
	const double samples_per_pixel = samplerate * scale;
	const double start = samplerate * (offset - start_time);
	const double end = start + samples_per_pixel * rect.width();

	snapshot->get_subsampled_edges(edges,
		min(max((int64_t)floor(start), (int64_t)0), last_sample),
		min(max((int64_t)ceil(end), (int64_t)0), last_sample),
		samples_per_pixel / Oversampling, _probe_index);
	assert(edges.size() >= 2);

	// Paint the edges
	const unsigned int edge_count = edges.size() - 2;
	QLineF *const edge_lines = new QLineF[edge_count];
	line = edge_lines;

	for(vector<pv::LogicDataSnapshot::EdgePair>::const_iterator i =
			edges.begin() + 1;
		i != edges.end() - 1; i++) {
		const float x = ((*i).first / samples_per_pixel -
			pixels_offset) + rect.left();
		*line++ = QLineF(x, high_offset, x, low_offset);
	}

	p.setPen(EdgeColour);
	p.drawLines(edge_lines, edge_count);
	delete[] edge_lines;

	// Paint the caps
	const unsigned int max_cap_line_count = (edges.size() - 1);
	QLineF *const cap_lines = new QLineF[max_cap_line_count];

	p.setPen(HighColour);
	paint_caps(p, cap_lines, edges, true, samples_per_pixel,
		pixels_offset, rect.left(), high_offset);
	p.setPen(LowColour);
	paint_caps(p, cap_lines, edges, false, samples_per_pixel,
		pixels_offset, rect.left(), low_offset);

	delete[] cap_lines;
}

void LogicSignal::paint_caps(QPainter &p, QLineF *const lines,
	vector< pair<int64_t, bool> > &edges, bool level,
	double samples_per_pixel, double pixels_offset, float x_offset,
	float y_offset)
{
	QLineF *line = lines;

	for(vector<pv::LogicDataSnapshot::EdgePair>::const_iterator i =
		edges.begin(); i != (edges.end() - 1); i++)
		if((*i).second == level) {
			*line++ = QLineF(
				((*i).first / samples_per_pixel -
					pixels_offset) + x_offset, y_offset,
				((*(i+1)).first / samples_per_pixel -
					pixels_offset) + x_offset, y_offset);
		}

	p.drawLines(lines, line - lines);
}

int LogicSignal::get_nominal_offset(const QRect &rect) const
{
	return rect.bottom() - Margin;
}

} // namespace view
} // namespace pv