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mutter/clutter/clutter-color.c
Emmanuele Bassi 2b81d90dd7 Eliminate G_CONST_RETURN 
The G_CONST_RETURN define in GLib is, and has always been, a bit fuzzy.

We always used it to conform to the platform, at least for public-facing
API.

At first I assumed it has something to do with brain-damaged compilers
or with weird platforms where const was not really supported; sadly,
it's something much, much worse: it's a define that can be toggled at
compile-time to remove const from the signature of public API. This is a
truly terrifying feature that I assume was added in the past century,
and whose inception clearly had something to do with massive doses of
absynthe and opium — because any other explanation would make the
existence of such a feature even worse than assuming drugs had anything
to do with it.

Anyway, and pleasing the gods, this dubious feature is being
removed/deprecated in GLib; see bug:

  https://bugzilla.gnome.org/show_bug.cgi?id=644611

Before deprecation, though, we should just remove its usage from the
whole API. We should especially remove its usage from Cally's internals,
since there it never made sense in the first place.
2011-06-07 16:06:24 +01:00

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/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Authored By Matthew Allum <mallum@openedhand.com>
*
* Copyright (C) 2006 OpenedHand
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* SECTION:clutter-color
* @short_description: Color management and manipulation.
*
* #ClutterColor is a simple type for representing colors in Clutter.
*
* A #ClutterColor is expressed as a 4-tuple of values ranging from
* zero to 255, one for each color channel plus one for the alpha.
*
* The alpha channel is fully opaque at 255 and fully transparent at 0.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <math.h>
#include <pango/pango-attributes.h>
#include "clutter-interval.h"
#include "clutter-main.h"
#include "clutter-color.h"
#include "clutter-private.h"
#include "clutter-debug.h"
/* XXX - keep in sync with the ClutterStaticColor enumeration order */
static const ClutterColor const static_colors[] = {
/* CGA/EGA color palette */
{ 0xff, 0xff, 0xff, 0xff }, /* white */
{ 0x00, 0x00, 0x00, 0xff }, /* black */
{ 0xff, 0x00, 0x00, 0xff }, /* red */
{ 0x80, 0x00, 0x00, 0xff }, /* dark red */
{ 0x00, 0xff, 0x00, 0xff }, /* green */
{ 0x00, 0x80, 0x00, 0xff }, /* dark green */
{ 0x00, 0x00, 0xff, 0xff }, /* blue */
{ 0x00, 0x00, 0x80, 0xff }, /* dark blue */
{ 0x00, 0xff, 0xff, 0xff }, /* cyan */
{ 0x00, 0x80, 0x80, 0xff }, /* dark cyan */
{ 0xff, 0x00, 0xff, 0xff }, /* magenta */
{ 0x80, 0x00, 0x80, 0xff }, /* dark magenta */
{ 0xff, 0xff, 0x00, 0xff }, /* yellow */
{ 0x80, 0x80, 0x00, 0xff }, /* dark yellow */
{ 0xa0, 0xa0, 0xa4, 0xff }, /* gray */
{ 0x80, 0x80, 0x80, 0xff }, /* dark gray */
{ 0xc0, 0xc0, 0xc0, 0xff }, /* light gray */
/* Tango Icon color palette */
{ 0xed, 0xd4, 0x00, 0xff }, /* butter */
{ 0xfc, 0xe9, 0x4f, 0xff }, /* butter light */
{ 0xc4, 0xa0, 0x00, 0xff }, /* butter dark */
{ 0xf5, 0x79, 0x00, 0xff }, /* orange */
{ 0xfc, 0xaf, 0x3e, 0xff }, /* orange light */
{ 0xce, 0x5c, 0x00, 0xff }, /* orange dark */
{ 0xc1, 0x7d, 0x11, 0xff }, /* chocolate */
{ 0xe9, 0xb9, 0x6e, 0xff }, /* chocolate light */
{ 0x8f, 0x59, 0x02, 0xff }, /* chocolate dark */
{ 0x73, 0xd2, 0x16, 0xff }, /* chameleon */
{ 0x8a, 0xe2, 0x34, 0xff }, /* chameleon light */
{ 0x4e, 0x9a, 0x06, 0xff }, /* chameleon dark */
{ 0x34, 0x65, 0xa4, 0xff }, /* sky blue */
{ 0x72, 0x9f, 0xcf, 0xff }, /* sky blue light */
{ 0x20, 0x4a, 0x87, 0xff }, /* sky blue dark */
{ 0x75, 0x50, 0x7b, 0xff }, /* plum */
{ 0xad, 0x7f, 0xa8, 0xff }, /* plum light */
{ 0x5c, 0x35, 0x66, 0xff }, /* plum dark */
{ 0xcc, 0x00, 0x00, 0xff }, /* scarlet red */
{ 0xef, 0x29, 0x29, 0xff }, /* scarlet red light */
{ 0xa4, 0x00, 0x00, 0xff }, /* scarlet red dark */
{ 0xee, 0xee, 0xec, 0xff }, /* aluminium 1 */
{ 0xd3, 0xd7, 0xcf, 0xff }, /* aluminium 2 */
{ 0xba, 0xbd, 0xb6, 0xff }, /* aluminium 3 */
{ 0x88, 0x8a, 0x85, 0xff }, /* aluminium 4 */
{ 0x55, 0x57, 0x53, 0xff }, /* aluminium 5 */
{ 0x2e, 0x34, 0x36, 0xff }, /* aluminium 6 */
/* last color */
{ 0x00, 0x00, 0x00, 0x00 } /* transparent */
};
/**
* clutter_color_get_static:
* @color: the named global color
*
* Retrieves a static color for the given @color name
*
* Static colors are created by Clutter and are guaranteed to always be
* available and valid
*
* Return value: a pointer to a static color; the returned pointer
* is owned by Clutter and it should never be modified or freed
*
* Since: 1.6
*/
const ClutterColor *
clutter_color_get_static (ClutterStaticColor color)
{
g_return_val_if_fail (color >= CLUTTER_COLOR_WHITE &&
color <= CLUTTER_COLOR_TRANSPARENT, NULL);
return &static_colors[color];
}
/**
* clutter_color_add:
* @a: a #ClutterColor
* @b: a #ClutterColor
* @result: (out caller-allocates): return location for the result
*
* Adds @a to @b and saves the resulting color inside @result.
*
* The alpha channel of @result is set as as the maximum value
* between the alpha channels of @a and @b.
*/
void
clutter_color_add (const ClutterColor *a,
const ClutterColor *b,
ClutterColor *result)
{
g_return_if_fail (a != NULL);
g_return_if_fail (b != NULL);
g_return_if_fail (result != NULL);
result->red = CLAMP (a->red + b->red, 0, 255);
result->green = CLAMP (a->green + b->green, 0, 255);
result->blue = CLAMP (a->blue + b->blue, 0, 255);
result->alpha = MAX (a->alpha, b->alpha);
}
/**
* clutter_color_subtract:
* @a: a #ClutterColor
* @b: a #ClutterColor
* @result: (out caller-allocates): return location for the result
*
* Subtracts @b from @a and saves the resulting color inside @result.
*
* This function assumes that the components of @a are greater than the
* components of @b; the result is, otherwise, undefined.
*
* The alpha channel of @result is set as the minimum value
* between the alpha channels of @a and @b.
*/
void
clutter_color_subtract (const ClutterColor *a,
const ClutterColor *b,
ClutterColor *result)
{
g_return_if_fail (a != NULL);
g_return_if_fail (b != NULL);
g_return_if_fail (result != NULL);
result->red = CLAMP (a->red - b->red, 0, 255);
result->green = CLAMP (a->green - b->green, 0, 255);
result->blue = CLAMP (a->blue - b->blue, 0, 255);
result->alpha = MIN (a->alpha, b->alpha);
}
/**
* clutter_color_lighten:
* @color: a #ClutterColor
* @result: (out caller-allocates): return location for the lighter color
*
* Lightens @color by a fixed amount, and saves the changed color
* in @result.
*/
void
clutter_color_lighten (const ClutterColor *color,
ClutterColor *result)
{
clutter_color_shade (color, 1.3, result);
}
/**
* clutter_color_darken:
* @color: a #ClutterColor
* @result: (out caller-allocates): return location for the darker color
*
* Darkens @color by a fixed amount, and saves the changed color
* in @result.
*/
void
clutter_color_darken (const ClutterColor *color,
ClutterColor *result)
{
clutter_color_shade (color, 0.7, result);
}
/**
* clutter_color_to_hls:
* @color: a #ClutterColor
* @hue: (out): return location for the hue value or %NULL
* @luminance: (out): return location for the luminance value or %NULL
* @saturation: (out): return location for the saturation value or %NULL
*
* Converts @color to the HLS format.
*
* The @hue value is in the 0 .. 360 range. The @luminance and
* @saturation values are in the 0 .. 1 range.
*/
void
clutter_color_to_hls (const ClutterColor *color,
float *hue,
float *luminance,
float *saturation)
{
float red, green, blue;
float min, max, delta;
float h, l, s;
g_return_if_fail (color != NULL);
red = color->red / 255.0;
green = color->green / 255.0;
blue = color->blue / 255.0;
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) / (2.0 - max - min);
delta = max - min;
if (red == max)
h = (green - blue) / delta;
else if (green == max)
h = 2.0 + (blue - red) / delta;
else if (blue == max)
h = 4.0 + (red - green) / delta;
h *= 60;
if (h < 0)
h += 360.0;
}
if (hue)
*hue = h;
if (luminance)
*luminance = l;
if (saturation)
*saturation = s;
}
/**
* clutter_color_from_hls:
* @color: (out): return location for a #ClutterColor
* @hue: hue value, in the 0 .. 360 range
* @luminance: luminance value, in the 0 .. 1 range
* @saturation: saturation value, in the 0 .. 1 range
*
* Converts a color expressed in HLS (hue, luminance and saturation)
* values into a #ClutterColor.
*/
void
clutter_color_from_hls (ClutterColor *color,
float hue,
float luminance,
float saturation)
{
float tmp1, tmp2;
float tmp3[3];
float clr[3];
int i;
hue /= 360.0;
if (saturation == 0)
{
color->red = color->green = color->blue = (luminance * 255);
return;
}
if (luminance <= 0.5)
tmp2 = luminance * (1.0 + saturation);
else
tmp2 = luminance + saturation - (luminance * saturation);
tmp1 = 2.0 * luminance - tmp2;
tmp3[0] = hue + 1.0 / 3.0;
tmp3[1] = hue;
tmp3[2] = hue - 1.0 / 3.0;
for (i = 0; i < 3; i++)
{
if (tmp3[i] < 0)
tmp3[i] += 1.0;
if (tmp3[i] > 1)
tmp3[i] -= 1.0;
if (6.0 * tmp3[i] < 1.0)
clr[i] = tmp1 + (tmp2 - tmp1) * tmp3[i] * 6.0;
else if (2.0 * tmp3[i] < 1.0)
clr[i] = tmp2;
else if (3.0 * tmp3[i] < 2.0)
clr[i] = (tmp1 + (tmp2 - tmp1) * ((2.0 / 3.0) - tmp3[i]) * 6.0);
else
clr[i] = tmp1;
}
color->red = floorf (clr[0] * 255.0 + 0.5);
color->green = floorf (clr[1] * 255.0 + 0.5);
color->blue = floorf (clr[2] * 255.0 + 0.5);
}
/**
* clutter_color_shade:
* @color: a #ClutterColor
* @factor: the shade factor to apply
* @result: (out caller-allocates): return location for the shaded color
*
* Shades @color by @factor and saves the modified color into @result.
*/
void
clutter_color_shade (const ClutterColor *color,
gdouble factor,
ClutterColor *result)
{
float h, l, s;
g_return_if_fail (color != NULL);
g_return_if_fail (result != NULL);
clutter_color_to_hls (color, &h, &l, &s);
l *= factor;
if (l > 1.0)
l = 1.0;
else if (l < 0)
l = 0;
s *= factor;
if (s > 1.0)
s = 1.0;
else if (s < 0)
s = 0;
clutter_color_from_hls (result, h, l, s);
result->alpha = color->alpha;
}
/**
* clutter_color_to_pixel:
* @color: a #ClutterColor
*
* Converts @color into a packed 32 bit integer, containing
* all the four 8 bit channels used by #ClutterColor.
*
* Return value: a packed color
*/
guint32
clutter_color_to_pixel (const ClutterColor *color)
{
g_return_val_if_fail (color != NULL, 0);
return (color->alpha |
color->blue << 8 |
color->green << 16 |
color->red << 24);
}
/**
* clutter_color_from_pixel:
* @color: (out caller-allocates): return location for a #ClutterColor
* @pixel: a 32 bit packed integer containing a color
*
* Converts @pixel from the packed representation of a four 8 bit channel
* color to a #ClutterColor.
*/
void
clutter_color_from_pixel (ClutterColor *color,
guint32 pixel)
{
g_return_if_fail (color != NULL);
color->red = pixel >> 24;
color->green = (pixel >> 16) & 0xff;
color->blue = (pixel >> 8) & 0xff;
color->alpha = pixel & 0xff;
}
static inline void
skip_whitespace (gchar **str)
{
while (g_ascii_isspace (**str))
*str += 1;
}
static inline void
parse_rgb_value (gchar *str,
guint8 *color,
gchar **endp)
{
gdouble number;
gchar *p;
skip_whitespace (&str);
number = g_ascii_strtod (str, endp);
p = *endp;
skip_whitespace (&p);
if (*p == '%')
{
*endp = (gchar *) (p + 1);
*color = CLAMP (number / 100.0, 0.0, 1.0) * 255;
}
else
*color = CLAMP (number, 0, 255);
}
static gboolean
parse_rgba (ClutterColor *color,
gchar *str,
gboolean has_alpha)
{
skip_whitespace (&str);
if (*str != '(')
return FALSE;
str += 1;
/* red */
parse_rgb_value (str, &color->red, &str);
skip_whitespace (&str);
if (*str != ',')
return FALSE;
str += 1;
/* green */
parse_rgb_value (str, &color->green, &str);
skip_whitespace (&str);
if (*str != ',')
return FALSE;
str += 1;
/* blue */
parse_rgb_value (str, &color->blue, &str);
skip_whitespace (&str);
/* alpha (optional); since the alpha channel value can only
* be between 0 and 1 we don't use the parse_rgb_value()
* function
*/
if (has_alpha)
{
gdouble number;
if (*str != ',')
return FALSE;
str += 1;
skip_whitespace (&str);
number = g_ascii_strtod (str, &str);
color->alpha = CLAMP (number * 255.0, 0, 255);
}
else
color->alpha = 255;
skip_whitespace (&str);
if (*str != ')')
return FALSE;
return TRUE;
}
static gboolean
parse_hsla (ClutterColor *color,
gchar *str,
gboolean has_alpha)
{
gdouble number;
gdouble h, l, s;
skip_whitespace (&str);
if (*str != '(')
return FALSE;
str += 1;
/* hue */
skip_whitespace (&str);
/* we don't do any angle normalization here because
* clutter_color_from_hls() will do it for us
*/
number = g_ascii_strtod (str, &str);
skip_whitespace (&str);
if (*str != ',')
return FALSE;
h = number;
str += 1;
/* saturation */
skip_whitespace (&str);
number = g_ascii_strtod (str, &str);
skip_whitespace (&str);
if (*str != '%')
return FALSE;
str += 1;
s = CLAMP (number / 100.0, 0.0, 1.0);
skip_whitespace (&str);
if (*str != ',')
return FALSE;
str += 1;
/* luminance */
skip_whitespace (&str);
number = g_ascii_strtod (str, &str);
skip_whitespace (&str);
if (*str != '%')
return FALSE;
str += 1;
l = CLAMP (number / 100.0, 0.0, 1.0);
/* alpha (optional); since the alpha channel value can only
* be between 0 and 1 we don't use the parse_rgb_value()
* function
*/
if (has_alpha)
{
if (*str != ',')
return FALSE;
str += 1;
skip_whitespace (&str);
number = g_ascii_strtod (str, &str);
color->alpha = CLAMP (number * 255.0, 0, 255);
}
else
color->alpha = 255;
skip_whitespace (&str);
if (*str != ')')
return FALSE;
clutter_color_from_hls (color, h, l, s);
return TRUE;
}
/**
* clutter_color_from_string:
* @color: (out caller-allocates): return location for a #ClutterColor
* @str: a string specifiying a color
*
* Parses a string definition of a color, filling the
* <structfield>red</structfield>, <structfield>green</structfield>,
* <structfield>blue</structfield> and <structfield>alpha</structfield>
* channels of @color.
*
* The @color is not allocated.
*
* The format of @str can be either one of:
*
* <itemizedlist>
* <listitem>
* <para>a standard name (as taken from the X11 rgb.txt file)</para>
* </listitem>
* <listitem>
* <para>an hexadecimal value in the form: <literal>&num;rgb</literal>,
* <literal>&num;rrggbb</literal>, <literal>&num;rgba</literal> or
* <literal>&num;rrggbbaa</literal></para>
* </listitem>
* <listitem>
* <para>a RGB color in the form: <literal>rgb(r, g, b)</literal></para>
* </listitem>
* <listitem>
* <para>a RGB color in the form: <literal>rgba(r, g, b, a)</literal></para>
* </listitem>
* <listitem>
* <para>a HSL color in the form: <literal>hsl(h, s, l)</literal></para>
* </listitem>
* <listitem>
* <para>a HSL color in the form: <literal>hsla(h, s, l, a)</literal></para>
* </listitem>
* </itemizedlist>
*
* where 'r', 'g', 'b' and 'a' are (respectively) the red, green, blue color
* intensities and the opacity. The 'h', 's' and 'l' are (respectively) the
* hue, saturation and luminance values.
*
* In the rgb() and rgba() formats, the 'r', 'g', and 'b' values are either
* integers between 0 and 255, or percentage values in the range between 0%
* and 100%; the percentages require the '%' character. The 'a' value, if
* specified, can only be a floating point value between 0.0 and 1.0.
*
* In the hls() and hlsa() formats, the 'h' value (hue) it's an angle between
* 0 and 360.0 degrees; the 'l' and 's' values (luminance and saturation) are
* a floating point value between 0.0 and 1.0. The 'a' value, if specified,
* can only be a floating point value between 0.0 and 1.0.
*
* Whitespace inside the definitions is ignored; no leading whitespace
* is allowed.
*
* If the alpha component is not specified then it is assumed to be set to
* be fully opaque.
*
* Return value: %TRUE if parsing succeeded, and %FALSE otherwise
*
* Since: 1.0
*/
gboolean
clutter_color_from_string (ClutterColor *color,
const gchar *str)
{
PangoColor pango_color = { 0, };
g_return_val_if_fail (color != NULL, FALSE);
g_return_val_if_fail (str != NULL, FALSE);
if (strncmp (str, "rgb", 3) == 0)
{
gchar *s = (gchar *) str;
gboolean res;
if (strncmp (str, "rgba", 4) == 0)
res = parse_rgba (color, s + 4, TRUE);
else
res = parse_rgba (color, s + 3, FALSE);
return res;
}
if (strncmp (str, "hsl", 3) == 0)
{
gchar *s = (gchar *) str;
gboolean res;
if (strncmp (str, "hsla", 4) == 0)
res = parse_hsla (color, s + 4, TRUE);
else
res = parse_hsla (color, s + 3, FALSE);
return res;
}
/* if the string contains a color encoded using the hexadecimal
* notations (#rrggbbaa or #rgba) we attempt a rough pass at
* parsing the color ourselves, as we need the alpha channel that
* Pango can't retrieve.
*/
if (str[0] == '#')
{
gint32 result;
if (sscanf (str + 1, "%x", &result))
{
gsize length = strlen (str);
switch (length)
{
case 9: /* rrggbbaa */
color->red = (result >> 24) & 0xff;
color->green = (result >> 16) & 0xff;
color->blue = (result >> 8) & 0xff;
color->alpha = result & 0xff;
return TRUE;
case 7: /* #rrggbb */
color->red = (result >> 16) & 0xff;
color->green = (result >> 8) & 0xff;
color->blue = result & 0xff;
color->alpha = 0xff;
return TRUE;
case 5: /* #rgba */
color->red = ((result >> 12) & 0xf);
color->green = ((result >> 8) & 0xf);
color->blue = ((result >> 4) & 0xf);
color->alpha = result & 0xf;
color->red = (color->red << 4) | color->red;
color->green = (color->green << 4) | color->green;
color->blue = (color->blue << 4) | color->blue;
color->alpha = (color->alpha << 4) | color->alpha;
return TRUE;
case 4: /* #rgb */
color->red = ((result >> 8) & 0xf);
color->green = ((result >> 4) & 0xf);
color->blue = result & 0xf;
color->red = (color->red << 4) | color->red;
color->green = (color->green << 4) | color->green;
color->blue = (color->blue << 4) | color->blue;
color->alpha = 0xff;
return TRUE;
default:
/* pass through to Pango */
break;
}
}
}
/* Fall back to pango for named colors */
if (pango_color_parse (&pango_color, str))
{
color->red = pango_color.red;
color->green = pango_color.green;
color->blue = pango_color.blue;
color->alpha = 0xff;
return TRUE;
}
return FALSE;
}
/**
* clutter_color_to_string:
* @color: a #ClutterColor
*
* Returns a textual specification of @color in the hexadecimal form
* <literal>&num;rrggbbaa</literal>, where <literal>r</literal>,
* <literal>g</literal>, <literal>b</literal> and <literal>a</literal> are
* hexadecimal digits representing the red, green, blue and alpha components
* respectively.
*
* Return value: (transfer full): a newly-allocated text string
*
* Since: 0.2
*/
gchar *
clutter_color_to_string (const ClutterColor *color)
{
g_return_val_if_fail (color != NULL, NULL);
return g_strdup_printf ("#%02x%02x%02x%02x",
color->red,
color->green,
color->blue,
color->alpha);
}
/**
* clutter_color_equal:
* @v1: a #ClutterColor
* @v2: a #ClutterColor
*
* Compares two #ClutterColor<!-- -->s and checks if they are the same.
*
* This function can be passed to g_hash_table_new() as the @key_equal_func
* parameter, when using #ClutterColor<!-- -->s as keys in a #GHashTable.
*
* Return value: %TRUE if the two colors are the same.
*
* Since: 0.2
*/
gboolean
clutter_color_equal (gconstpointer v1,
gconstpointer v2)
{
const ClutterColor *a, *b;
g_return_val_if_fail (v1 != NULL, FALSE);
g_return_val_if_fail (v2 != NULL, FALSE);
if (v1 == v2)
return TRUE;
a = v1;
b = v2;
return (a->red == b->red &&
a->green == b->green &&
a->blue == b->blue &&
a->alpha == b->alpha);
}
/**
* clutter_color_hash:
* @v: a #ClutterColor
*
* Converts a #ClutterColor to a hash value.
*
* This function can be passed to g_hash_table_new() as the @hash_func
* parameter, when using #ClutterColor<!-- -->s as keys in a #GHashTable.
*
* Return value: a hash value corresponding to the color
*
* Since: 1.0
*/
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
*/
const 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);
}
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