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mutter/clutter/clutter-color.c
Emmanuele Bassi e3259435f2 2.0: Remove all Since: annotations 
We're starting from scratch.
2013-04-05 18:48:01 +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
*
*
*/
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 = CLAMP (l * factor, 0.0, 1.0);
s = CLAMP (s * factor, 0.0, 1.0);
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);
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)
{
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
*
*
*/
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] == '#' && str[1] != '\0')
{
gsize length = strlen (str + 1);
gint32 result;
if (sscanf (str + 1, "%x", &result) == 1)
{
switch (length)
{
case 8: /* rrggbbaa */
color->red = (result >> 24) & 0xff;
color->green = (result >> 16) & 0xff;
color->blue = (result >> 8) & 0xff;
color->alpha = result & 0xff;
return TRUE;
case 6: /* #rrggbb */
color->red = (result >> 16) & 0xff;
color->green = (result >> 8) & 0xff;
color->blue = result & 0xff;
color->alpha = 0xff;
return TRUE;
case 4: /* #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 3: /* #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:
return FALSE;
}
}
}
/* fall back to pango for X11-style named colors; see:
*
* http://en.wikipedia.org/wiki/X11_color_names
*
* for a list. at some point we might even ship with our own list generated
* from X11/rgb.txt, like we generate the key symbols.
*/
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
*
*
*/
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: (type Clutter.Color): a #ClutterColor
* @v2: (type Clutter.Color): 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.
*
*
*/
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: (type Clutter.Color): 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
*
*
*/
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
*
*
*/
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.
*
*
*/
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().
*
*
*/
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.
*
* This function is the equivalent of:
*
* |[
* clutter_color_init (clutter_color_alloc (), red, green, blue, alpha);
* ]|
*
* Return value: (transfer full): the newly allocated color.
* Use clutter_color_free() when done
*
*
*/
ClutterColor *
clutter_color_new (guint8 red,
guint8 green,
guint8 blue,
guint8 alpha)
{
return clutter_color_init (clutter_color_alloc (),
red,
green,
blue,
alpha);
}
/**
* clutter_color_alloc: (constructor)
*
* Allocates a new, transparent black #ClutterColor.
*
* Return value: (transfer full): the newly allocated #ClutterColor; use
* clutter_color_free() to free its resources
*
*
*/
ClutterColor *
clutter_color_alloc (void)
{
return g_slice_new0 (ClutterColor);
}
/**
* clutter_color_init:
* @color: a #ClutterColor
* @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
*
* Initializes @color with the given values.
*
* Return value: (transfer none): the initialized #ClutterColor
*
*
*/
ClutterColor *
clutter_color_init (ClutterColor *color,
guint8 red,
guint8 green,
guint8 blue,
guint8 alpha)
{
g_return_val_if_fail (color != NULL, NULL);
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.
*
*
*/
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
*
*
*/
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
*
*
*/
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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