diff options
Diffstat (limited to 'libmate-desktop/mate-desktop-utils.c')
| -rw-r--r-- | libmate-desktop/mate-desktop-utils.c | 248 |
1 files changed, 248 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 |