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mutter/clutter/clutter-color.c
Neil Roberts f4ee7dc0e1 clutter-color: Don't directly read the contents of GValue structs 
The code for implementing ClutterColor as GParamSpec and the
color↔string transformation functions were assuming that ClutterColor
owns the data in the GValue struct and directly reading
data[0].v_pointer to get a pointer to the color. However ClutterColor
is actually a boxed type and the format of the data array is meant to
be internal to GObject so it is not safe to poke around in it
directly. This patch changes it to use g_value_get_boxed to get the
pointer.

Also, boxed types allow a NULL value to be stored and not all of the
code was coping with this. This patch also attempts to fix that.

http://bugzilla.openedhand.com/show_bug.cgi?id=2068
2010-05-05 18:49:09 +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-main.h"
#include "clutter-color.h"
#include "clutter-private.h"
#include "clutter-debug.h"
/**
* clutter_color_add:
* @a: a #ClutterColor
* @b: a #ClutterColor
* @result: (out): 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): 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): 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): 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: return location for the hue value or %NULL
* @luminance: return location for the luminance value or %NULL
* @saturation: 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): 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): 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;
}
/**
* clutter_color_from_string:
* @color: (out): return location for a #ClutterColor
* @str: a string specifiying a color (named color or #RRGGBBAA)
*
* 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. If alpha is not specified it will be set full opaque.
*
* The @color is not allocated.
*
* The color may be defined by any of the formats understood by
* pango_color_from_string(); these include literal color names, like
* <literal>Red</literal> or <literal>DarkSlateGray</literal>, or
* hexadecimal specifications like <literal>&num;3050b2</literal> or
* <literal>&num;333</literal>.
*
* Return value: %TRUE if parsing succeeded.
*
* 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 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
* hex digits representing the red, green, blue and alpha components
* respectively.
*
* Return value: 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_copy:
* @color: a #ClutterColor
*
* Makes a copy of the color structure. The result must be
* freed using clutter_color_free().
*
* Return value: 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: 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);
}
GType
clutter_color_get_type (void)
{
static GType _clutter_color_type = 0;
if (G_UNLIKELY (_clutter_color_type == 0))
{
_clutter_color_type =
g_boxed_type_register_static (I_("ClutterColor"),
(GBoxedCopyFunc) clutter_color_copy,
(GBoxedFreeFunc) clutter_color_free);
g_value_register_transform_func (_clutter_color_type, G_TYPE_STRING,
clutter_value_transform_color_string);
g_value_register_transform_func (G_TYPE_STRING, _clutter_color_type,
clutter_value_transform_string_color);
}
return _clutter_color_type;
}
/**
* 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: the colors 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:
* @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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