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authorDenis Gorodnichev <[email protected]>2014-07-15 20:56:23 +0400
committerinfirit <[email protected]>2014-11-07 11:53:38 +0100
commit30b3258e94915b56cd77844263cde76f8b6fda06 (patch)
tree944d2c9b9676e4723758fd2ca63395eb8de30bc2
parenteba75e2839a09c8d5109c1a4b77ff96b65551a13 (diff)
downloadmate-desktop-30b3258e94915b56cd77844263cde76f8b6fda06.tar.bz2
mate-desktop-30b3258e94915b56cd77844263cde76f8b6fda06.tar.xz
mate_desktop_gtk_style_get_light_color and mate_desktop_gtk_style_get_dark_color
Diffstat
-rw-r--r--libmate-desktop/mate-desktop-utils.c248
-rw-r--r--libmate-desktop/mate-desktop-utils.h12
2 files changed, 260 insertions, 0 deletions
diff --git a/libmate-desktop/mate-desktop-utils.c b/libmate-desktop/mate-desktop-utils.c
index 431c57f..df7aa3f 100644
--- a/libmate-desktop/mate-desktop-utils.c
+++ b/libmate-desktop/mate-desktop-utils.c
@@ -36,6 +36,23 @@
#include "private.h"
+#if GTK_CHECK_VERSION (3, 0, 0)
+static void
+gtk_style_shade (GdkRGBA *a,
+ GdkRGBA *b,
+ gdouble k);
+
+static void
+rgb_to_hls (gdouble *r,
+ gdouble *g,
+ gdouble *b);
+
+static void
+hls_to_rgb (gdouble *h,
+ gdouble *l,
+ gdouble *s);
+#endif
+
/**
* mate_desktop_prepend_terminal_to_vector:
* @argc: a pointer to the vector size
@@ -224,3 +241,234 @@ _mate_desktop_init_i18n (void) {
}
}
+
+#if GTK_CHECK_VERSION (3, 0, 0)
+
+/**
+ * Takes a colour "a", scales the lightness and saturation by a certain amount,
+ * and sets "b" to the resulting colour.
+ * gtkstyle.c cut-and-pastage.
+ *
+ * \param a the starting colour
+ * \param b [out] the resulting colour
+ * \param k amount to scale lightness and saturation by
+ */
+static void
+gtk_style_shade (GdkRGBA *a,
+ GdkRGBA *b,
+ gdouble k)
+{
+ gdouble red;
+ gdouble green;
+ gdouble blue;
+
+ red = a->red;
+ green = a->green;
+ blue = a->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);
+
+ b->red = red;
+ b->green = green;
+ b->blue = blue;
+}
+
+/**
+ * Converts a red/green/blue triplet to a hue/lightness/saturation triplet.
+ *
+ * \param r on input, red; on output, hue
+ * \param g on input, green; on output, lightness
+ * \param b on input, blue; on output, saturation
+ */
+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;
+}
+
+/**
+ * Converts a hue/lightness/saturation triplet to a red/green/blue triplet.
+ *
+ * \param h on input, hue; on output, red
+ * \param l on input, lightness; on output, green
+ * \param s on input, saturation; on output, blue
+ */
+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;
+ }
+}
+
+/* Based on set_color() in gtkstyle.c */
+#define LIGHTNESS_MULT 1.3
+#define DARKNESS_MULT 0.7
+void
+mate_desktop_gtk_style_get_light_color (GtkStyleContext *style,
+ GtkStateFlags state,
+ GdkRGBA *color)
+{
+ gtk_style_context_get_background_color (style, state, color);
+ gtk_style_shade (color, color, LIGHTNESS_MULT);
+}
+
+void
+mate_desktop_gtk_style_get_dark_color (GtkStyleContext *style,
+ GtkStateFlags state,
+ GdkRGBA *color)
+{
+ gtk_style_context_get_background_color (style, state, color);
+ gtk_style_shade (color, color, DARKNESS_MULT);
+}
+#endif
diff --git a/libmate-desktop/mate-desktop-utils.h b/libmate-desktop/mate-desktop-utils.h
index 824b11a..972e0e9 100644
--- a/libmate-desktop/mate-desktop-utils.h
+++ b/libmate-desktop/mate-desktop-utils.h
@@ -42,6 +42,18 @@ void mate_desktop_prepend_terminal_to_vector (int *argc, char ***argv);
/* replace gdk_spawn_command_line_on_screen, not available in GTK3 */
gboolean mate_gdk_spawn_command_line_on_screen (GdkScreen *screen, const gchar *command, GError **error);
+#if GTK_CHECK_VERSION (3, 0, 0)
+void
+mate_desktop_gtk_style_get_light_color (GtkStyleContext *style,
+ GtkStateFlags state,
+ GdkRGBA *color);
+
+void
+mate_desktop_gtk_style_get_dark_color (GtkStyleContext *style,
+ GtkStateFlags state,
+ GdkRGBA *color);
+#endif
+
G_END_DECLS
#endif /* MATE_DESKTOP_UTILS_H */
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