DecodeTrace: Prevent trace height from jumping

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

diff --git a/pv/view/decodetrace.cpp b/pv/view/decodetrace.cpp
index 31ea9d73647f42ba7436753a305f267a235337d3..f2aadd1b18ff3c7e4b8904a53aeef1b8f7c8d0a9 100644 (file)
--- a/pv/view/decodetrace.cpp
+++ b/pv/view/decodetrace.cpp
@@ -133,6 +133,7 @@ DecodeTrace::DecodeTrace(pv::Session &session,
        session_(session),
        decoder_stack_(decoder_stack),
        row_height_(0),
+       max_visible_rows_(0),
        delete_mapper_(this),
        show_hide_mapper_(this)
 {
@@ -160,10 +161,9 @@ const std::shared_ptr<pv::data::DecoderStack>& DecodeTrace::decoder() const
 
 pair<int, int> DecodeTrace::v_extents() const
 {
-       /// @todo Replace this with an implementation that knows the true
-       /// height of the trace
        const int row_height = (ViewItemPaintParams::text_height() * 6) / 4;
-       return make_pair(-row_height / 2, row_height * 7 / 2);
+
+       return make_pair(-row_height, row_height * max_visible_rows_);
 }
 
 void DecodeTrace::paint_back(QPainter &p, const ViewItemPaintParams &pp)
@@ -222,6 +222,9 @@ void DecodeTrace::paint_mid(QPainter &p, const ViewItemPaintParams &pp)
 
        // Draw the hatching
        draw_unresolved_period(p, annotation_height, pp.left(), pp.right());
+
+       // Update the maximum row count if needed
+       max_visible_rows_ = std::max(max_visible_rows_, (int)visible_rows_.size());
 }
 
 void DecodeTrace::paint_fore(QPainter &p, const ViewItemPaintParams &pp)
@@ -354,7 +357,7 @@ void DecodeTrace::draw_annotations(vector<pv::data::decode::Annotation> annotati
                                draw_annotation(a_block.front(), p, h, pp, y, base_colour);
                        else
                                if (a_block.size() > 0)
-                                       draw_annotation_block(a_block, p, h, pp, y, base_colour);
+                                       draw_annotation_block(a_block, p, h, y, base_colour);
 
                        a_block.clear();
                }
@@ -366,7 +369,7 @@ void DecodeTrace::draw_annotations(vector<pv::data::decode::Annotation> annotati
        if (a_block.size() == 1)
                draw_annotation(a_block.front(), p, h, pp, y, base_colour);
        else
-               draw_annotation_block(a_block, p, h, pp, y, base_colour);
+               draw_annotation_block(a_block, p, h, y, base_colour);
 }
 
 void DecodeTrace::draw_annotation(const pv::data::decode::Annotation &a,
@@ -395,31 +398,53 @@ void DecodeTrace::draw_annotation(const pv::data::decode::Annotation &a,
                draw_range(a, p, fill, outline, h, start, end, y);
 }
 
-void DecodeTrace::draw_annotation_block(vector<pv::data::decode::Annotation> a,
-       QPainter &p, int h, const ViewItemPaintParams &pp, int y,
-       size_t base_colour) const
+void DecodeTrace::draw_annotation_block(
+       vector<pv::data::decode::Annotation> annotations, QPainter &p, int h,
+       int y, size_t base_colour) const
 {
+       using namespace pv::data::decode;
+
        double samples_per_pixel, pixels_offset;
        tie(pixels_offset, samples_per_pixel) =
                get_pixels_offset_samples_per_pixel();
 
-       const size_t colour =
-               (base_colour + a.front().format()) % countof(Colours);
+       const double start = annotations.front().start_sample() /
+               samples_per_pixel - pixels_offset;
+       const double end = annotations.back().end_sample() /
+               samples_per_pixel - pixels_offset;
 
-       const int start = a.front().start_sample() / samples_per_pixel -
-               pixels_offset;
-       const int end = a.back().end_sample() / samples_per_pixel -
-               pixels_offset;
+       const double top = y + .5 - h / 2;
+       const double bottom = y + .5 + h / 2;
+       const double cap_width = min((end - start) / 4, EndCapWidth);
+
+       QPointF pts[] = {
+               QPointF(start, y + .5f),
+               QPointF(start + cap_width, top),
+               QPointF(end - cap_width, top),
+               QPointF(end, y + .5f),
+               QPointF(end - cap_width, bottom),
+               QPointF(start + cap_width, bottom)
+       };
 
-       const QRectF rect(
-               std::max(pp.left(), start),
-               y - h/2 + 0.5,
-               std::min(pp.right(), end) - std::max(pp.left(), start) + 1,
-               h);
+       const size_t colour = (base_colour + annotations.front().format()) %
+               countof(Colours);
 
-       p.setPen(OutlineColours[colour]);
-       p.setBrush(Colours[colour]);
-       p.drawRect(rect);
+       // Check if all annotations are of the same type (i.e. we can use one color)
+       // or if we should use a neutral color (i.e. gray)
+       bool single_format = true;
+       int format = annotations.front().format();
+
+       for (const Annotation &a : annotations)
+               if (a.format() != format) {
+                       single_format = false;
+                       break;
+               }
+
+       p.setPen((single_format ? OutlineColours[colour] : Qt::gray));
+       p.setBrush(QBrush((single_format ? Colours[colour] : Qt::gray),
+               Qt::Dense4Pattern));
+
+       p.drawConvexPolygon(pts, countof(pts));
 }
 
 void DecodeTrace::draw_instant(const pv::data::decode::Annotation &a, QPainter &p,