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sysprof: add stable alpha variation

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This is something that original flamegraphs do to aid in seeing adjacent
towers. We want that too, but we need it to be stable across redraws. Use
the hash of the symbol rather than g_random_double_range() for that.
This commit is contained in:
Christian Hergert
2023-08-25 11:15:14 -07:00
parent ec03b13b49
commit be9cf3d5f8
1 changed files with 9 additions and 4 deletions
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13
src/sysprof/sysprof-flame-graph.c
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@ -148,11 +148,16 @@ sysprof_flame_graph_snapshot (GtkWidget *widget,
{
FlameRectangle *rect = &g_array_index (self->nodes, FlameRectangle, i);
SysprofCallgraphCategory category = SYSPROF_CALLGRAPH_CATEGORY_UNMASK (rect->node->category);
const GdkRGBA *color = sysprof_callgraph_category_get_color (category);
const GdkRGBA *category_color = sysprof_callgraph_category_get_color (category);
graphene_rect_t area;
GdkRGBA color;
if (color == NULL)
color = default_color;
if (category_color == NULL)
color = *default_color;
else
color = *category_color;
color.alpha = .6 + (g_str_hash (rect->node->summary->symbol->name) % 1000) / 2500.;
area = GRAPHENE_RECT_INIT (rect->x / (double)G_MAXUINT16 * width,
rect->y,
@ -162,7 +167,7 @@ sysprof_flame_graph_snapshot (GtkWidget *widget,
if (!highlight && graphene_rect_contains_point (&area, &point))
highlight = rect;
gtk_snapshot_append_color (child_snapshot, color, &area);
gtk_snapshot_append_color (child_snapshot, &color, &area);
if (area.size.width > ROW_HEIGHT)
{