From 9472f4476b27336e9187635015169e308bfe8af7 Mon Sep 17 00:00:00 2001
From: Joel Holdsworth <joel@airwebreathe.org.uk>
Date: Wed, 4 Sep 2013 13:44:52 +0100
Subject: [PATCH] Initial decode painting

---
 pv/view/decode/annotation.cpp | 28 ++++++++++++++++++++++++++++
 pv/view/decode/annotation.h   |  3 +++
 pv/view/decodesignal.cpp      | 28 +++++++++++++++++++++++++---
 3 files changed, 56 insertions(+), 3 deletions(-)

diff --git a/pv/view/decode/annotation.cpp b/pv/view/decode/annotation.cpp
index 4d9a0483..741569b2 100644
--- a/pv/view/decode/annotation.cpp
+++ b/pv/view/decode/annotation.cpp
@@ -22,6 +22,8 @@ extern "C" {
 #include <libsigrokdecode/libsigrokdecode.h>
 }
 
+#include <QPainter>
+
 #include "annotation.h"
 
 using namespace boost;
@@ -42,6 +44,32 @@ Annotation::Annotation(const srd_proto_data *const pdata) :
 	}
 }
 
+void Annotation::paint(QPainter &p, int left, int right,
+	double samples_per_pixel, double pixels_offset, int y)
+{
+	const int AnnotationHeight = 40;
+
+	const double start = _start_sample / samples_per_pixel -
+		pixels_offset;
+	const double end = _end_sample / samples_per_pixel -
+		pixels_offset;
+
+	if (start > right)
+		return;
+	if (end < left)
+		return;
+
+	QRectF rect(start, y - AnnotationHeight/2,
+		end - start, AnnotationHeight);
+
+	p.setPen(Qt::black);
+	p.fillRect(rect, QBrush(Qt::red));
+	p.drawRect(rect);
+
+	if(!_annotations.empty())
+		p.drawText(rect, Qt::AlignCenter, _annotations.front());
+}
+
 } // namespace decode
 } // namespace view
 } // namespace pv
diff --git a/pv/view/decode/annotation.h b/pv/view/decode/annotation.h
index 4e24121c..7ba7d367 100644
--- a/pv/view/decode/annotation.h
+++ b/pv/view/decode/annotation.h
@@ -36,6 +36,9 @@ class Annotation
 public:
 	Annotation(const srd_proto_data *const pdata);
 
+	void paint(QPainter &p, int left, int right, double samples_per_pixel,
+		double pixels_offset, int y);
+
 private:
 	uint64_t _start_sample;
 	uint64_t _end_sample;
diff --git a/pv/view/decodesignal.cpp b/pv/view/decodesignal.cpp
index 44144d1b..33ea33f3 100644
--- a/pv/view/decodesignal.cpp
+++ b/pv/view/decodesignal.cpp
@@ -26,6 +26,7 @@ extern "C" {
 
 #include <pv/data/decoder.h>
 #include <pv/view/view.h>
+#include <pv/view/decode/annotation.h>
 
 using namespace boost;
 using namespace std;
@@ -61,9 +62,30 @@ void DecodeSignal::set_view(pv::view::View *view)
 
 void DecodeSignal::paint(QPainter &p, int left, int right)
 {
-	(void)p;
-	(void)left;
-	(void)right;
+	using namespace pv::view::decode;
+
+	assert(_view);
+	const int y = _v_offset - _view->v_offset();
+
+	const double scale = _view->scale();
+	assert(scale > 0);
+
+	double samplerate = _decoder->get_samplerate();
+
+	// Show sample rate as 1Hz when it is unknown
+	if (samplerate == 0.0)
+		samplerate = 1.0;
+
+	const double pixels_offset = (_view->offset() -
+		_decoder->get_start_time()) / scale;
+	const double samples_per_pixel = samplerate * scale;
+
+	assert(_decoder);
+	vector< shared_ptr<Annotation> > annotations(_decoder->annotations());
+	BOOST_FOREACH(shared_ptr<Annotation> a, annotations) {
+		assert(a);
+		a->paint(p, left, right, samples_per_pixel, pixels_offset, y);
+	}
 }
 
 const list<QAction*> DecodeSignal::get_context_bar_actions()
-- 
2.30.2