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css: Add a function to get color coords

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This will be used in the implementation of relative colors.
This commit is contained in:
Matthias Clasen 2024-06-02 11:12:56 -04:00
parent d8492121aa
commit b5fd894f77
2 changed files with 36 additions and 0 deletions
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32
gtk/gtkcsscolorvalue.c
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@ -1820,5 +1820,37 @@ gtk_css_color_value_get_color (const GtkCssValue *color)
return &color->color;
}
float
gtk_css_color_value_get_coord (const GtkCssValue *color,
GtkCssColorSpace color_space,
gboolean legacy_srgb,
guint coord)
{
GtkCssColor origin;
g_assert (coord < 4);
if (color->type != COLOR_TYPE_COLOR)
return 0;
if (color->type == COLOR_TYPE_COLOR)
gtk_css_color_init_from_color (&origin, &color->color);
else
gtk_css_color_init (&origin, GTK_CSS_COLOR_SPACE_SRGB, (float *) &color->rgba);
if (color_space != origin.color_space)
{
GtkCssColor tmp;
gtk_css_color_convert (&origin, color_space, &tmp);
gtk_css_color_init_from_color (&origin, &tmp);
}
/* Scale up r, g, b in legacy context */
if (color_space == GTK_CSS_COLOR_SPACE_SRGB && legacy_srgb && coord < 3)
return origin.values[coord] * 255.;
else
return origin.values[coord];
}
/* }}} */
/* vim:set foldmethod=marker expandtab: */

4
gtk/gtkcsscolorvalueprivate.h
View File

@ -48,6 +48,10 @@ GtkCssValue * gtk_css_color_value_new_color (GtkCssColorSpace color_
const GtkCssColor *
gtk_css_color_value_get_color (const GtkCssValue *color) G_GNUC_CONST;
float gtk_css_color_value_get_coord (const GtkCssValue *color,
GtkCssColorSpace color_space,
gboolean legacy_srgb,
guint coord);
G_END_DECLS