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color: Add Color.interpolate() method
The interpolate() method does what it says on the tin: it interpolates between two colors using the given factor. ClutterColor uses it to register a progress function for Intervals.
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@ -41,6 +41,7 @@
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#include <pango/pango-attributes.h>
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#include "clutter-interval.h"
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#include "clutter-main.h"
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#include "clutter-color.h"
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#include "clutter-private.h"
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@ -555,6 +556,50 @@ clutter_color_hash (gconstpointer v)
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return clutter_color_to_pixel ((const ClutterColor *) v);
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}
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/**
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* clutter_color_interpolate:
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* @initial: the initial #ClutterColor
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* @final: the final #ClutterColor
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* @progress: the interpolation progress
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* @result: (out): return location for the interpolation
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*
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* Interpolates between @initial and @final #ClutterColor<!-- -->s
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* using @progress
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*
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* Since: 1.6
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*/
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void
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clutter_color_interpolate (const ClutterColor *initial,
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const ClutterColor *final,
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gdouble progress,
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ClutterColor *result)
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{
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g_return_if_fail (initial != NULL);
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g_return_if_fail (final != NULL);
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g_return_if_fail (result != NULL);
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result->red = initial->red + (final->red - initial->red) * progress;
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result->green = initial->green + (final->green - initial->green) * progress;
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result->blue = initial->blue + (final->blue - initial->blue) * progress;
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result->alpha = initial->alpha + (final->alpha - initial->alpha) * progress;
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}
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static gboolean
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clutter_color_progress (const GValue *a,
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const GValue *b,
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gdouble progress,
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GValue *retval)
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{
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const ClutterColor *a_color = clutter_value_get_color (a);
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const ClutterColor *b_color = clutter_value_get_color (b);
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ClutterColor res = { 0, };
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clutter_color_interpolate (a_color, b_color, progress, &res);
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clutter_value_set_color (retval, &res);
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return TRUE;
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}
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/**
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* clutter_color_copy:
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* @color: a #ClutterColor
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@ -672,6 +717,9 @@ clutter_color_get_type (void)
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clutter_value_transform_color_string);
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g_value_register_transform_func (G_TYPE_STRING, _clutter_color_type,
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clutter_value_transform_string_color);
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clutter_interval_register_progress_func (_clutter_color_type,
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clutter_color_progress);
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}
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return _clutter_color_type;
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@ -102,6 +102,11 @@ guint clutter_color_hash (gconstpointer v);
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gboolean clutter_color_equal (gconstpointer v1,
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gconstpointer v2);
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void clutter_color_interpolate (const ClutterColor *initial,
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const ClutterColor *final,
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gdouble progress,
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ClutterColor *result);
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#define CLUTTER_TYPE_PARAM_COLOR (clutter_param_color_get_type ())
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#define CLUTTER_PARAM_SPEC_COLOR(pspec) (G_TYPE_CHECK_INSTANCE_CAST ((pspec), CLUTTER_TYPE_PARAM_COLOR, ClutterParamSpecColor))
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#define CLUTTER_IS_PARAM_SPEC_COLOR(pspec) (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), CLUTTER_TYPE_PARAM_COLOR))
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@ -973,6 +973,7 @@ clutter_color_subtract
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clutter_color_lighten
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clutter_color_darken
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clutter_color_shade
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clutter_color_interpolate
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<SUBSECTION>
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ClutterParamSpecColor
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