7dd09e2186
We actually need a couple more macros for registering GValue transformation functions. Those should be added to upstream GLib.
850 lines
21 KiB
C
850 lines
21 KiB
C
/*
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* Clutter.
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*
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* An OpenGL based 'interactive canvas' library.
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*
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* Authored By Matthew Allum <mallum@openedhand.com>
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*
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* Copyright (C) 2006 OpenedHand
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* SECTION:clutter-color
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* @short_description: Color management and manipulation.
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*
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* #ClutterColor is a simple type for representing colors in Clutter.
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*
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* A #ClutterColor is expressed as a 4-tuple of values ranging from
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* zero to 255, one for each color channel plus one for the alpha.
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*
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* The alpha channel is fully opaque at 255 and fully transparent at 0.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <math.h>
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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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#include "clutter-debug.h"
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/**
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* clutter_color_add:
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* @a: a #ClutterColor
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* @b: a #ClutterColor
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* @result: (out caller-allocates): return location for the result
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*
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* Adds @a to @b and saves the resulting color inside @result.
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*
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* The alpha channel of @result is set as as the maximum value
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* between the alpha channels of @a and @b.
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*/
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void
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clutter_color_add (const ClutterColor *a,
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const ClutterColor *b,
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ClutterColor *result)
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{
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g_return_if_fail (a != NULL);
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g_return_if_fail (b != NULL);
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g_return_if_fail (result != NULL);
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result->red = CLAMP (a->red + b->red, 0, 255);
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result->green = CLAMP (a->green + b->green, 0, 255);
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result->blue = CLAMP (a->blue + b->blue, 0, 255);
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result->alpha = MAX (a->alpha, b->alpha);
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}
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/**
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* clutter_color_subtract:
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* @a: a #ClutterColor
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* @b: a #ClutterColor
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* @result: (out caller-allocates): return location for the result
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*
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* Subtracts @b from @a and saves the resulting color inside @result.
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*
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* This function assumes that the components of @a are greater than the
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* components of @b; the result is, otherwise, undefined.
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*
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* The alpha channel of @result is set as the minimum value
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* between the alpha channels of @a and @b.
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*/
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void
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clutter_color_subtract (const ClutterColor *a,
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const ClutterColor *b,
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ClutterColor *result)
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{
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g_return_if_fail (a != NULL);
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g_return_if_fail (b != NULL);
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g_return_if_fail (result != NULL);
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result->red = CLAMP (a->red - b->red, 0, 255);
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result->green = CLAMP (a->green - b->green, 0, 255);
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result->blue = CLAMP (a->blue - b->blue, 0, 255);
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result->alpha = MIN (a->alpha, b->alpha);
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}
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/**
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* clutter_color_lighten:
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* @color: a #ClutterColor
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* @result: (out caller-allocates): return location for the lighter color
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*
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* Lightens @color by a fixed amount, and saves the changed color
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* in @result.
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*/
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void
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clutter_color_lighten (const ClutterColor *color,
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ClutterColor *result)
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{
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clutter_color_shade (color, 1.3, result);
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}
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/**
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* clutter_color_darken:
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* @color: a #ClutterColor
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* @result: (out caller-allocates): return location for the darker color
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*
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* Darkens @color by a fixed amount, and saves the changed color
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* in @result.
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*/
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void
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clutter_color_darken (const ClutterColor *color,
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ClutterColor *result)
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{
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clutter_color_shade (color, 0.7, result);
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}
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/**
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* clutter_color_to_hls:
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* @color: a #ClutterColor
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* @hue: (out): return location for the hue value or %NULL
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* @luminance: (out): return location for the luminance value or %NULL
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* @saturation: (out): return location for the saturation value or %NULL
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*
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* Converts @color to the HLS format.
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*
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* The @hue value is in the 0 .. 360 range. The @luminance and
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* @saturation values are in the 0 .. 1 range.
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*/
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void
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clutter_color_to_hls (const ClutterColor *color,
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float *hue,
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float *luminance,
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float *saturation)
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{
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float red, green, blue;
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float min, max, delta;
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float h, l, s;
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g_return_if_fail (color != NULL);
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red = color->red / 255.0;
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green = color->green / 255.0;
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blue = color->blue / 255.0;
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if (red > green)
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{
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if (red > blue)
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max = red;
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else
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max = blue;
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if (green < blue)
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min = green;
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else
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min = blue;
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}
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else
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{
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if (green > blue)
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max = green;
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else
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max = blue;
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if (red < blue)
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min = red;
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else
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min = blue;
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}
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l = (max + min) / 2;
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s = 0;
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h = 0;
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if (max != min)
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{
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if (l <= 0.5)
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s = (max - min) / (max + min);
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else
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s = (max - min) / (2.0 - max - min);
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delta = max - min;
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if (red == max)
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h = (green - blue) / delta;
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else if (green == max)
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h = 2.0 + (blue - red) / delta;
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else if (blue == max)
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h = 4.0 + (red - green) / delta;
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h *= 60;
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if (h < 0)
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h += 360.0;
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}
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if (hue)
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*hue = h;
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if (luminance)
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*luminance = l;
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if (saturation)
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*saturation = s;
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}
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/**
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* clutter_color_from_hls:
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* @color: (out): return location for a #ClutterColor
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* @hue: hue value, in the 0 .. 360 range
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* @luminance: luminance value, in the 0 .. 1 range
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* @saturation: saturation value, in the 0 .. 1 range
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*
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* Converts a color expressed in HLS (hue, luminance and saturation)
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* values into a #ClutterColor.
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*/
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void
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clutter_color_from_hls (ClutterColor *color,
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float hue,
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float luminance,
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float saturation)
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{
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float tmp1, tmp2;
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float tmp3[3];
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float clr[3];
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int i;
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hue /= 360.0;
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if (saturation == 0)
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{
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color->red = color->green = color->blue = (luminance * 255);
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return;
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}
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if (luminance <= 0.5)
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tmp2 = luminance * (1.0 + saturation);
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else
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tmp2 = luminance + saturation - (luminance * saturation);
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tmp1 = 2.0 * luminance - tmp2;
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tmp3[0] = hue + 1.0 / 3.0;
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tmp3[1] = hue;
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tmp3[2] = hue - 1.0 / 3.0;
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for (i = 0; i < 3; i++)
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{
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if (tmp3[i] < 0)
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tmp3[i] += 1.0;
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if (tmp3[i] > 1)
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tmp3[i] -= 1.0;
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if (6.0 * tmp3[i] < 1.0)
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clr[i] = tmp1 + (tmp2 - tmp1) * tmp3[i] * 6.0;
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else if (2.0 * tmp3[i] < 1.0)
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clr[i] = tmp2;
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else if (3.0 * tmp3[i] < 2.0)
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clr[i] = (tmp1 + (tmp2 - tmp1) * ((2.0 / 3.0) - tmp3[i]) * 6.0);
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else
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clr[i] = tmp1;
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}
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color->red = floorf (clr[0] * 255.0 + 0.5);
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color->green = floorf (clr[1] * 255.0 + 0.5);
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color->blue = floorf (clr[2] * 255.0 + 0.5);
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}
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/**
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* clutter_color_shade:
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* @color: a #ClutterColor
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* @factor: the shade factor to apply
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* @result: (out caller-allocates): return location for the shaded color
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*
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* Shades @color by @factor and saves the modified color into @result.
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*/
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void
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clutter_color_shade (const ClutterColor *color,
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gdouble factor,
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ClutterColor *result)
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{
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float h, l, s;
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g_return_if_fail (color != NULL);
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g_return_if_fail (result != NULL);
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clutter_color_to_hls (color, &h, &l, &s);
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l *= factor;
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if (l > 1.0)
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l = 1.0;
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else if (l < 0)
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l = 0;
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s *= factor;
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if (s > 1.0)
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s = 1.0;
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else if (s < 0)
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s = 0;
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clutter_color_from_hls (result, h, l, s);
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result->alpha = color->alpha;
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}
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/**
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* clutter_color_to_pixel:
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* @color: a #ClutterColor
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*
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* Converts @color into a packed 32 bit integer, containing
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* all the four 8 bit channels used by #ClutterColor.
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*
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* Return value: a packed color
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*/
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guint32
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clutter_color_to_pixel (const ClutterColor *color)
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{
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g_return_val_if_fail (color != NULL, 0);
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return (color->alpha |
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color->blue << 8 |
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color->green << 16 |
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color->red << 24);
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}
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/**
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* clutter_color_from_pixel:
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* @color: (out caller-allocates): return location for a #ClutterColor
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* @pixel: a 32 bit packed integer containing a color
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*
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* Converts @pixel from the packed representation of a four 8 bit channel
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* color to a #ClutterColor.
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*/
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void
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clutter_color_from_pixel (ClutterColor *color,
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guint32 pixel)
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{
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g_return_if_fail (color != NULL);
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color->red = pixel >> 24;
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color->green = (pixel >> 16) & 0xff;
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color->blue = (pixel >> 8) & 0xff;
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color->alpha = pixel & 0xff;
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}
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/**
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* clutter_color_from_string:
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* @color: (out caller-allocates): return location for a #ClutterColor
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* @str: a string specifiying a color (named color or #RRGGBBAA)
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*
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* Parses a string definition of a color, filling the
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* <structfield>red</structfield>, <structfield>green</structfield>,
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* <structfield>blue</structfield> and <structfield>alpha</structfield>
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* channels of @color. If alpha is not specified it will be set full opaque.
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*
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* The @color is not allocated.
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*
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* The color may be defined by any of the formats understood by
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* pango_color_from_string(); these include literal color names, like
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* <literal>Red</literal> or <literal>DarkSlateGray</literal>, or
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* hexadecimal specifications like <literal>#3050b2</literal> or
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* <literal>#333</literal>.
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*
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* Return value: %TRUE if parsing succeeded.
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*
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* Since: 1.0
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*/
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gboolean
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clutter_color_from_string (ClutterColor *color,
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const gchar *str)
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{
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PangoColor pango_color = { 0, };
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g_return_val_if_fail (color != NULL, FALSE);
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g_return_val_if_fail (str != NULL, FALSE);
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/* if the string contains a color encoded using the hexadecimal
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* notations (#rrggbbaa or #rgba) we attempt a rough pass at
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* parsing the color ourselves, as we need the alpha channel that
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* Pango can't retrieve.
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*/
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if (str[0] == '#')
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{
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gint32 result;
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if (sscanf (str + 1, "%x", &result))
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{
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gsize length = strlen (str);
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switch (length)
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{
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case 9: /* rrggbbaa */
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color->red = (result >> 24) & 0xff;
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color->green = (result >> 16) & 0xff;
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color->blue = (result >> 8) & 0xff;
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color->alpha = result & 0xff;
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return TRUE;
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case 7: /* #rrggbb */
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color->red = (result >> 16) & 0xff;
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color->green = (result >> 8) & 0xff;
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color->blue = result & 0xff;
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color->alpha = 0xff;
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return TRUE;
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case 5: /* #rgba */
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color->red = ((result >> 12) & 0xf);
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color->green = ((result >> 8) & 0xf);
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color->blue = ((result >> 4) & 0xf);
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color->alpha = result & 0xf;
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color->red = (color->red << 4) | color->red;
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color->green = (color->green << 4) | color->green;
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color->blue = (color->blue << 4) | color->blue;
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color->alpha = (color->alpha << 4) | color->alpha;
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return TRUE;
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case 4: /* #rgb */
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color->red = ((result >> 8) & 0xf);
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color->green = ((result >> 4) & 0xf);
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color->blue = result & 0xf;
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color->red = (color->red << 4) | color->red;
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color->green = (color->green << 4) | color->green;
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color->blue = (color->blue << 4) | color->blue;
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color->alpha = 0xff;
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return TRUE;
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default:
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/* pass through to Pango */
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break;
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}
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}
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}
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/* Fall back to pango for named colors */
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if (pango_color_parse (&pango_color, str))
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{
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color->red = pango_color.red;
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color->green = pango_color.green;
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color->blue = pango_color.blue;
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color->alpha = 0xff;
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return TRUE;
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}
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return FALSE;
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}
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/**
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* clutter_color_to_string:
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* @color: a #ClutterColor
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*
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* Returns a textual specification of @color in the hexadecimal form
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* <literal>#rrggbbaa</literal>, where <literal>r</literal>,
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* <literal>g</literal>, <literal>b</literal> and <literal>a</literal> are
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* hex digits representing the red, green, blue and alpha components
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* respectively.
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*
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* Return value: (transfer full): a newly-allocated text string
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*
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* Since: 0.2
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*/
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gchar *
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clutter_color_to_string (const ClutterColor *color)
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{
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g_return_val_if_fail (color != NULL, NULL);
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return g_strdup_printf ("#%02x%02x%02x%02x",
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color->red,
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color->green,
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color->blue,
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color->alpha);
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}
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/**
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* clutter_color_equal:
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* @v1: a #ClutterColor
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* @v2: a #ClutterColor
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*
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* Compares two #ClutterColor<!-- -->s and checks if they are the same.
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*
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* This function can be passed to g_hash_table_new() as the @key_equal_func
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* parameter, when using #ClutterColor<!-- -->s as keys in a #GHashTable.
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*
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* Return value: %TRUE if the two colors are the same.
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*
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* Since: 0.2
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*/
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gboolean
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clutter_color_equal (gconstpointer v1,
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gconstpointer v2)
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{
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const ClutterColor *a, *b;
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g_return_val_if_fail (v1 != NULL, FALSE);
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g_return_val_if_fail (v2 != NULL, FALSE);
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if (v1 == v2)
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return TRUE;
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a = v1;
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b = v2;
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return (a->red == b->red &&
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a->green == b->green &&
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a->blue == b->blue &&
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a->alpha == b->alpha);
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}
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/**
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* clutter_color_hash:
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* @v: a #ClutterColor
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*
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* Converts a #ClutterColor to a hash value.
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*
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* This function can be passed to g_hash_table_new() as the @hash_func
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* parameter, when using #ClutterColor<!-- -->s as keys in a #GHashTable.
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*
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* Return value: a hash value corresponding to the color
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*
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* Since: 1.0
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*/
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guint
|
|
clutter_color_hash (gconstpointer v)
|
|
{
|
|
return clutter_color_to_pixel ((const ClutterColor *) v);
|
|
}
|
|
|
|
/**
|
|
* clutter_color_interpolate:
|
|
* @initial: the initial #ClutterColor
|
|
* @final: the final #ClutterColor
|
|
* @progress: the interpolation progress
|
|
* @result: (out): return location for the interpolation
|
|
*
|
|
* Interpolates between @initial and @final #ClutterColor<!-- -->s
|
|
* using @progress
|
|
*
|
|
* Since: 1.6
|
|
*/
|
|
void
|
|
clutter_color_interpolate (const ClutterColor *initial,
|
|
const ClutterColor *final,
|
|
gdouble progress,
|
|
ClutterColor *result)
|
|
{
|
|
g_return_if_fail (initial != NULL);
|
|
g_return_if_fail (final != NULL);
|
|
g_return_if_fail (result != NULL);
|
|
|
|
result->red = initial->red + (final->red - initial->red) * progress;
|
|
result->green = initial->green + (final->green - initial->green) * progress;
|
|
result->blue = initial->blue + (final->blue - initial->blue) * progress;
|
|
result->alpha = initial->alpha + (final->alpha - initial->alpha) * progress;
|
|
}
|
|
|
|
static gboolean
|
|
clutter_color_progress (const GValue *a,
|
|
const GValue *b,
|
|
gdouble progress,
|
|
GValue *retval)
|
|
{
|
|
const ClutterColor *a_color = clutter_value_get_color (a);
|
|
const ClutterColor *b_color = clutter_value_get_color (b);
|
|
ClutterColor res = { 0, };
|
|
|
|
clutter_color_interpolate (a_color, b_color, progress, &res);
|
|
clutter_value_set_color (retval, &res);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* clutter_color_copy:
|
|
* @color: a #ClutterColor
|
|
*
|
|
* Makes a copy of the color structure. The result must be
|
|
* freed using clutter_color_free().
|
|
*
|
|
* Return value: (transfer full): an allocated copy of @color.
|
|
*
|
|
* Since: 0.2
|
|
*/
|
|
ClutterColor *
|
|
clutter_color_copy (const ClutterColor *color)
|
|
{
|
|
if (G_LIKELY (color != NULL))
|
|
return g_slice_dup (ClutterColor, color);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* clutter_color_free:
|
|
* @color: a #ClutterColor
|
|
*
|
|
* Frees a color structure created with clutter_color_copy().
|
|
*
|
|
* Since: 0.2
|
|
*/
|
|
void
|
|
clutter_color_free (ClutterColor *color)
|
|
{
|
|
if (G_LIKELY (color != NULL))
|
|
g_slice_free (ClutterColor, color);
|
|
}
|
|
|
|
/**
|
|
* clutter_color_new:
|
|
* @red: red component of the color, between 0 and 255
|
|
* @green: green component of the color, between 0 and 255
|
|
* @blue: blue component of the color, between 0 and 255
|
|
* @alpha: alpha component of the color, between 0 and 255
|
|
*
|
|
* Creates a new #ClutterColor with the given values.
|
|
*
|
|
* Return value: (transfer full): the newly allocated color.
|
|
* Use clutter_color_free() when done
|
|
*
|
|
* Since: 0.8.4
|
|
*/
|
|
ClutterColor *
|
|
clutter_color_new (guint8 red,
|
|
guint8 green,
|
|
guint8 blue,
|
|
guint8 alpha)
|
|
{
|
|
ClutterColor *color;
|
|
|
|
color = g_slice_new (ClutterColor);
|
|
|
|
color->red = red;
|
|
color->green = green;
|
|
color->blue = blue;
|
|
color->alpha = alpha;
|
|
|
|
return color;
|
|
}
|
|
|
|
static void
|
|
clutter_value_transform_color_string (const GValue *src,
|
|
GValue *dest)
|
|
{
|
|
const ClutterColor *color = g_value_get_boxed (src);
|
|
|
|
if (color)
|
|
{
|
|
gchar *string = clutter_color_to_string (color);
|
|
|
|
g_value_take_string (dest, string);
|
|
}
|
|
else
|
|
g_value_set_string (dest, NULL);
|
|
}
|
|
|
|
static void
|
|
clutter_value_transform_string_color (const GValue *src,
|
|
GValue *dest)
|
|
{
|
|
const char *str = g_value_get_string (src);
|
|
|
|
if (str)
|
|
{
|
|
ClutterColor color = { 0, };
|
|
|
|
clutter_color_from_string (&color, str);
|
|
|
|
clutter_value_set_color (dest, &color);
|
|
}
|
|
else
|
|
clutter_value_set_color (dest, NULL);
|
|
}
|
|
|
|
G_DEFINE_BOXED_TYPE_WITH_CODE (ClutterColor, clutter_color,
|
|
clutter_color_copy,
|
|
clutter_color_free,
|
|
CLUTTER_REGISTER_VALUE_TRANSFORM_TO (G_TYPE_STRING, clutter_value_transform_color_string)
|
|
CLUTTER_REGISTER_VALUE_TRANSFORM_FROM (G_TYPE_STRING, clutter_value_transform_string_color)
|
|
CLUTTER_REGISTER_INTERVAL_PROGRESS (clutter_color_progress));
|
|
|
|
/**
|
|
* clutter_value_set_color:
|
|
* @value: a #GValue initialized to #CLUTTER_TYPE_COLOR
|
|
* @color: the color to set
|
|
*
|
|
* Sets @value to @color.
|
|
*
|
|
* Since: 0.8.4
|
|
*/
|
|
void
|
|
clutter_value_set_color (GValue *value,
|
|
const ClutterColor *color)
|
|
{
|
|
g_return_if_fail (CLUTTER_VALUE_HOLDS_COLOR (value));
|
|
|
|
g_value_set_boxed (value, color);
|
|
}
|
|
|
|
/**
|
|
* clutter_value_get_color:
|
|
* @value: a #GValue initialized to #CLUTTER_TYPE_COLOR
|
|
*
|
|
* Gets the #ClutterColor contained in @value.
|
|
*
|
|
* Return value: (transfer none): the color inside the passed #GValue
|
|
*
|
|
* Since: 0.8.4
|
|
*/
|
|
G_CONST_RETURN ClutterColor *
|
|
clutter_value_get_color (const GValue *value)
|
|
{
|
|
g_return_val_if_fail (CLUTTER_VALUE_HOLDS_COLOR (value), NULL);
|
|
|
|
return g_value_get_boxed (value);
|
|
}
|
|
|
|
static void
|
|
param_color_init (GParamSpec *pspec)
|
|
{
|
|
ClutterParamSpecColor *cspec = CLUTTER_PARAM_SPEC_COLOR (pspec);
|
|
|
|
cspec->default_value = NULL;
|
|
}
|
|
|
|
static void
|
|
param_color_finalize (GParamSpec *pspec)
|
|
{
|
|
ClutterParamSpecColor *cspec = CLUTTER_PARAM_SPEC_COLOR (pspec);
|
|
|
|
clutter_color_free (cspec->default_value);
|
|
}
|
|
|
|
static void
|
|
param_color_set_default (GParamSpec *pspec,
|
|
GValue *value)
|
|
{
|
|
const ClutterColor *default_value =
|
|
CLUTTER_PARAM_SPEC_COLOR (pspec)->default_value;
|
|
clutter_value_set_color (value, default_value);
|
|
}
|
|
|
|
static gint
|
|
param_color_values_cmp (GParamSpec *pspec,
|
|
const GValue *value1,
|
|
const GValue *value2)
|
|
{
|
|
const ClutterColor *color1 = g_value_get_boxed (value1);
|
|
const ClutterColor *color2 = g_value_get_boxed (value2);
|
|
int pixel1, pixel2;
|
|
|
|
if (color1 == NULL)
|
|
return color2 == NULL ? 0 : -1;
|
|
|
|
pixel1 = clutter_color_to_pixel (color1);
|
|
pixel2 = clutter_color_to_pixel (color2);
|
|
|
|
if (pixel1 < pixel2)
|
|
return -1;
|
|
else if (pixel1 == pixel2)
|
|
return 0;
|
|
else
|
|
return 1;
|
|
}
|
|
|
|
GType
|
|
clutter_param_color_get_type (void)
|
|
{
|
|
static GType pspec_type = 0;
|
|
|
|
if (G_UNLIKELY (pspec_type == 0))
|
|
{
|
|
const GParamSpecTypeInfo pspec_info = {
|
|
sizeof (ClutterParamSpecColor),
|
|
16,
|
|
param_color_init,
|
|
CLUTTER_TYPE_COLOR,
|
|
param_color_finalize,
|
|
param_color_set_default,
|
|
NULL,
|
|
param_color_values_cmp,
|
|
};
|
|
|
|
pspec_type = g_param_type_register_static (I_("ClutterParamSpecColor"),
|
|
&pspec_info);
|
|
}
|
|
|
|
return pspec_type;
|
|
}
|
|
|
|
/**
|
|
* clutter_param_spec_color: (skip)
|
|
* @name: name of the property
|
|
* @nick: short name
|
|
* @blurb: description (can be translatable)
|
|
* @default_value: default value
|
|
* @flags: flags for the param spec
|
|
*
|
|
* Creates a #GParamSpec for properties using #ClutterColor.
|
|
*
|
|
* Return value: the newly created #GParamSpec
|
|
*
|
|
* Since: 0.8.4
|
|
*/
|
|
GParamSpec *
|
|
clutter_param_spec_color (const gchar *name,
|
|
const gchar *nick,
|
|
const gchar *blurb,
|
|
const ClutterColor *default_value,
|
|
GParamFlags flags)
|
|
{
|
|
ClutterParamSpecColor *cspec;
|
|
|
|
cspec = g_param_spec_internal (CLUTTER_TYPE_PARAM_COLOR,
|
|
name, nick, blurb, flags);
|
|
|
|
cspec->default_value = clutter_color_copy (default_value);
|
|
|
|
return G_PARAM_SPEC (cspec);
|
|
}
|