perf-chart: Use Danielle Madelay's awesome chart gradients

1 files changed, 26 insertions, 1 deletions

diff --git a/perf/cairo-perf-chart.c b/perf/cairo-perf-chart.c
index ae2c07f0..69f76f67 100644
--- a/perf/cairo-perf-chart.c
+++ b/perf/cairo-perf-chart.c
@@ -307,17 +307,30 @@ test_background (struct chart *c, int test)
     cairo_fill (c->cr);
 }
 
+static cairo_pattern_t *
+get_report_pattern (const struct color *color, int x, int y, int w, int h)
+{
+    cairo_pattern_t *pattern;
+
+    pattern = cairo_pattern_create_linear (x, y, x + w, y);
+    cairo_pattern_add_color_stop_rgb (pattern, 0.2, color->red, color->green, color->blue);
+    cairo_pattern_add_color_stop_rgb (pattern, 0.8, 1, 1, 1);
+    cairo_pattern_add_color_stop_rgb (pattern, 0.8, color->red, color->green, color->blue);
+
+    return pattern;
+}
+
 static void
 add_chart (struct chart *c, int test, int report, double value)
 {
     double dx, dy, x;
     struct color color;
+    cairo_pattern_t *pattern;
 
     if (fabs (value) < 0.1)
 	return;
 
     get_report_color (c, report, &color);
-    cairo_set_source_rgb (c->cr, color.red, color.green, color.blue);
 
     if (c->relative) {
 	cairo_text_extents_t extents;
@@ -330,6 +343,12 @@ add_chart (struct chart *c, int test, int report, double value)
 	dx = c->width / (double) (c->num_tests * c->num_reports);
 	x = dx * (c->num_reports * test + report - .5);
 
+        pattern = get_report_pattern (&color, 
+                                      floor (x), c->height / 2.,
+                                      floor (x + dx) - floor (x),
+                                      ceil (-dy*value - c->height/2.) + c->height/2.);
+        cairo_set_source (c->cr, pattern);
+        cairo_pattern_destroy (pattern);
 	cairo_rectangle (c->cr,
 			 floor (x), c->height / 2.,
 			 floor (x + dx) - floor (x),
@@ -375,6 +394,12 @@ add_chart (struct chart *c, int test, int report, double value)
 	dx = c->width / (double) (c->num_tests * (c->num_reports+1));
 	x = dx * ((c->num_reports+1) * test + report + .5);
 
+        pattern = get_report_pattern (&color, 
+                                      floor (x), c->height,
+                                      floor (x + dx) - floor (x),
+                                      ceil (c->height - dy*value) - c->height);
+        cairo_set_source (c->cr, pattern);
+        cairo_pattern_destroy (pattern);
 	cairo_rectangle (c->cr,
 			 floor (x), c->height,
 			 floor (x + dx) - floor (x),