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GtkSymbolicColor: Add gtk_symbolic_color_new_alpha()

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This function modifies the alpha channel of a color, multiplying
it by a factor.
This commit is contained in:
Carlos Garnacho
2010-10-25 20:41:36 +02:00
parent 0bd81ef710
commit ca44965f33
2 changed files with 50 additions and 1 deletions
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49
gtk/gtksymboliccolor.c
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@ -32,6 +32,7 @@ typedef enum {
COLOR_TYPE_LITERAL,
COLOR_TYPE_NAME,
COLOR_TYPE_SHADE,
COLOR_TYPE_ALPHA,
COLOR_TYPE_MIX
} ColorType;
@ -49,7 +50,7 @@ struct _GtkSymbolicColor
{
GtkSymbolicColor *color;
gdouble factor;
} shade;
} shade, alpha;
struct
{
@ -165,6 +166,37 @@ gtk_symbolic_color_new_shade (GtkSymbolicColor *color,
return symbolic_color;
}
/**
* gtk_symbolic_color_new_alpha:
* @color: another #GtkSymbolicColor
* @factor: factor to apply to @color alpha
*
* Creates a symbolic color by modifying the relative alpha
* value of @color. A factor < 1.0 would resolve to a more
* transparent color, while > 1.0 would resolve to a more
* opaque color.
*
* Returns: A newly created #GtkSymbolicColor
*
* Since: 3.0
**/
GtkSymbolicColor *
gtk_symbolic_color_new_alpha (GtkSymbolicColor *color,
gdouble factor)
{
GtkSymbolicColor *symbolic_color;
g_return_val_if_fail (color != NULL, NULL);
symbolic_color = g_slice_new0 (GtkSymbolicColor);
symbolic_color->type = COLOR_TYPE_ALPHA;
symbolic_color->alpha.color = gtk_symbolic_color_ref (color);
symbolic_color->alpha.factor = CLAMP (factor, 0, 1);
symbolic_color->ref_count = 1;
return symbolic_color;
}
/**
* gtk_symbolic_color_new_mix:
* @color1: color to mix
@ -245,6 +277,9 @@ gtk_symbolic_color_unref (GtkSymbolicColor *color)
case COLOR_TYPE_SHADE:
gtk_symbolic_color_unref (color->shade.color);
break;
case COLOR_TYPE_ALPHA:
gtk_symbolic_color_unref (color->alpha.color);
break;
case COLOR_TYPE_MIX:
gtk_symbolic_color_unref (color->mix.color1);
gtk_symbolic_color_unref (color->mix.color2);
@ -315,6 +350,18 @@ gtk_symbolic_color_resolve (GtkSymbolicColor *color,
}
break;
case COLOR_TYPE_ALPHA:
{
GdkRGBA alpha;
if (!gtk_symbolic_color_resolve (color->alpha.color, style_set, &alpha))
return FALSE;
*resolved_color = alpha;
resolved_color->alpha = CLAMP (alpha.alpha * color->alpha.factor, 0, 1);
return TRUE;
}
case COLOR_TYPE_MIX:
{
GdkRGBA color1, color2;