[sysprof/wip/gtk4-port: 18/125] marksaid: embed rgba shading code
- From: Christian Hergert <chergert src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [sysprof/wip/gtk4-port: 18/125] marksaid: embed rgba shading code
- Date: Fri, 29 Oct 2021 02:02:29 +0000 (UTC)
commit 0aa9ed3ef605c8ed1aceede1ba038ee67816b12b
Author: Christian Hergert <chergert redhat com>
Date: Tue Sep 28 13:19:13 2021 -0700
marksaid: embed rgba shading code
src/libsysprof-ui/sysprof-marks-aid.c | 173 +++++++++++++++++++++++++++++++++-
1 file changed, 172 insertions(+), 1 deletion(-)
---
diff --git a/src/libsysprof-ui/sysprof-marks-aid.c b/src/libsysprof-ui/sysprof-marks-aid.c
index 98744c91..4361dfab 100644
--- a/src/libsysprof-ui/sysprof-marks-aid.c
+++ b/src/libsysprof-ui/sysprof-marks-aid.c
@@ -46,6 +46,177 @@ typedef struct
G_DEFINE_TYPE (SysprofMarksAid, sysprof_marks_aid, SYSPROF_TYPE_AID)
+static void
+rgb_to_hls (gdouble *r,
+ gdouble *g,
+ gdouble *b)
+{
+ gdouble min;
+ gdouble max;
+ gdouble red;
+ gdouble green;
+ gdouble blue;
+ gdouble h, l, s;
+ gdouble delta;
+
+ red = *r;
+ green = *g;
+ blue = *b;
+ if (red > green)
+ {
+ if (red > blue)
+ max = red;
+ else
+ max = blue;
+ if (green < blue)
+ min = green;
+ else
+ min = blue;
+ }
+ else
+ {
+ if (green > blue)
+ max = green;
+ else
+ max = blue;
+ if (red < blue)
+ min = red;
+ else
+ min = blue;
+ }
+ l = (max + min) / 2;
+ s = 0;
+ h = 0;
+ if (max != min)
+ {
+ if (l <= 0.5)
+ s = (max - min) / (max + min);
+ else
+ s = (max - min) / (2 - max - min);
+ delta = max - min;
+ if (red == max)
+ h = (green - blue) / delta;
+ else if (green == max)
+ h = 2 + (blue - red) / delta;
+ else if (blue == max)
+ h = 4 + (red - green) / delta;
+ h *= 60;
+ if (h < 0.0)
+ h += 360;
+ }
+ *r = h;
+ *g = l;
+ *b = s;
+}
+
+static void
+hls_to_rgb (gdouble *h,
+ gdouble *l,
+ gdouble *s)
+{
+ gdouble hue;
+ gdouble lightness;
+ gdouble saturation;
+ gdouble m1, m2;
+ gdouble r, g, b;
+
+ lightness = *l;
+ saturation = *s;
+ if (lightness <= 0.5)
+ m2 = lightness * (1 + saturation);
+ else
+ m2 = lightness + saturation - lightness * saturation;
+ m1 = 2 * lightness - m2;
+ if (saturation == 0)
+ {
+ *h = lightness;
+ *l = lightness;
+ *s = lightness;
+ }
+ else
+ {
+ hue = *h + 120;
+ while (hue > 360)
+ hue -= 360;
+ while (hue < 0)
+ hue += 360;
+ if (hue < 60)
+ r = m1 + (m2 - m1) * hue / 60;
+ else if (hue < 180)
+ r = m2;
+ else if (hue < 240)
+ r = m1 + (m2 - m1) * (240 - hue) / 60;
+ else
+ r = m1;
+ hue = *h;
+ while (hue > 360)
+ hue -= 360;
+ while (hue < 0)
+ hue += 360;
+ if (hue < 60)
+ g = m1 + (m2 - m1) * hue / 60;
+ else if (hue < 180)
+ g = m2;
+ else if (hue < 240)
+ g = m1 + (m2 - m1) * (240 - hue) / 60;
+ else
+ g = m1;
+ hue = *h - 120;
+ while (hue > 360)
+ hue -= 360;
+ while (hue < 0)
+ hue += 360;
+ if (hue < 60)
+ b = m1 + (m2 - m1) * hue / 60;
+ else if (hue < 180)
+ b = m2;
+ else if (hue < 240)
+ b = m1 + (m2 - m1) * (240 - hue) / 60;
+ else
+ b = m1;
+ *h = r;
+ *l = g;
+ *s = b;
+ }
+}
+
+static void
+rgba_shade (const GdkRGBA *rgba,
+ GdkRGBA *dst,
+ gdouble k)
+{
+ gdouble red;
+ gdouble green;
+ gdouble blue;
+
+ red = rgba->red;
+ green = rgba->green;
+ blue = rgba->blue;
+
+ rgb_to_hls (&red, &green, &blue);
+
+ green *= k;
+
+ if (green > 1.0)
+ green = 1.0;
+ else if (green < 0.0)
+ green = 0.0;
+
+ blue *= k;
+
+ if (blue > 1.0)
+ blue = 1.0;
+ else if (blue < 0.0)
+ blue = 0.0;
+
+ hls_to_rgb (&red, &green, &blue);
+
+ dst->red = red;
+ dst->green = green;
+ dst->blue = blue;
+ dst->alpha = rgba->alpha;
+}
+
static void
present_free (gpointer data)
{
@@ -275,7 +446,7 @@ sysprof_marks_aid_present_finish (SysprofAid *aid,
if (!g_hash_table_contains (seen, GUINT_TO_POINTER (span->kind)))
{
- dzl_rgba_shade (&rgba, &kind_rgba, 1 + (ratio * span->kind));
+ rgba_shade (&rgba, &kind_rgba, 1 + (ratio * span->kind));
g_hash_table_insert (seen,
GUINT_TO_POINTER (span->kind),
g_memdup2 (&kind_rgba, sizeof kind_rgba));
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