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gtk2/gtk/gtksymboliccolor.c
Benjamin Otte 4f6a55d689 cssimage: Implement proper cross-fades for gradients 
This is intended mainly to speed up the current situation with spinners
on debug kernels. Because we now don't use a cross-fade to draw the
transition but instead have a real gradient that we draw, we don't need
to use the slow cross-fade code.

https://bugzilla.gnome.org/show_bug.cgi?id=684639
2012-10-02 14:16:37 +02:00

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/* GTK - The GIMP Toolkit
* Copyright (C) 2010 Carlos Garnacho <carlosg@gnome.org>
*
* 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/>.
*/
#include "config.h"
#include "gtkcssrgbavalueprivate.h"
#include "gtkcssstylepropertyprivate.h"
#include "gtkstylepropertyprivate.h"
#include "gtksymboliccolorprivate.h"
#include "gtkstyleproperties.h"
#include "gtkintl.h"
#include "gtkwin32themeprivate.h"
/**
* SECTION:gtksymboliccolor
* @Short_description: Symbolic colors
* @Title: GtkSymbolicColor
*
* GtkSymbolicColor is a boxed type that represents a symbolic color.
* It is the result of parsing a
* <link linkend="gtkcssprovider-symbolic-colors">color expression</link>.
* To obtain the color represented by a GtkSymbolicColor, it has to
* be resolved with gtk_symbolic_color_resolve(), which replaces all
* symbolic color references by the colors they refer to (in a given
* context) and evaluates mix, shade and other expressions, resulting
* in a #GdkRGBA value.
*
* It is not normally necessary to deal directly with #GtkSymbolicColors,
* since they are mostly used behind the scenes by #GtkStyleContext and
* #GtkCssProvider.
*/
G_DEFINE_BOXED_TYPE (GtkSymbolicColor, gtk_symbolic_color,
gtk_symbolic_color_ref, gtk_symbolic_color_unref)
/* Symbolic colors */
typedef enum {
COLOR_TYPE_LITERAL,
COLOR_TYPE_NAME,
COLOR_TYPE_SHADE,
COLOR_TYPE_ALPHA,
COLOR_TYPE_MIX,
COLOR_TYPE_WIN32,
COLOR_TYPE_CURRENT_COLOR
} ColorType;
struct _GtkSymbolicColor
{
GTK_CSS_VALUE_BASE
ColorType type;
GtkCssValue *last_value;
union
{
gchar *name;
struct
{
GtkSymbolicColor *color;
gdouble factor;
} shade, alpha;
struct
{
GtkSymbolicColor *color1;
GtkSymbolicColor *color2;
gdouble factor;
} mix;
struct
{
gchar *theme_class;
gint id;
} win32;
};
};
static void
gtk_css_value_symbolic_free (GtkCssValue *value)
{
GtkSymbolicColor *color = (GtkSymbolicColor *) value;
_gtk_css_value_unref (color->last_value);
switch (color->type)
{
case COLOR_TYPE_NAME:
g_free (color->name);
break;
case COLOR_TYPE_SHADE:
gtk_symbolic_color_unref (color->shade.color);
break;
case COLOR_TYPE_ALPHA:
gtk_symbolic_color_unref (color->alpha.color);
break;
case COLOR_TYPE_MIX:
gtk_symbolic_color_unref (color->mix.color1);
gtk_symbolic_color_unref (color->mix.color2);
break;
case COLOR_TYPE_WIN32:
g_free (color->win32.theme_class);
break;
default:
break;
}
g_slice_free (GtkSymbolicColor, color);
}
static GtkCssValue *
gtk_css_value_symbolic_get_fallback (guint property_id,
GtkStyleProviderPrivate *provider,
GtkCssComputedValues *values,
GtkCssComputedValues *parent_values)
{
static const GdkRGBA transparent = { 0, 0, 0, 0 };
switch (property_id)
{
case GTK_CSS_PROPERTY_BACKGROUND_IMAGE:
case GTK_CSS_PROPERTY_BORDER_IMAGE_SOURCE:
case GTK_CSS_PROPERTY_TEXT_SHADOW:
case GTK_CSS_PROPERTY_ICON_SHADOW:
case GTK_CSS_PROPERTY_BOX_SHADOW:
return _gtk_css_rgba_value_new_from_rgba (&transparent);
case GTK_CSS_PROPERTY_COLOR:
case GTK_CSS_PROPERTY_BACKGROUND_COLOR:
case GTK_CSS_PROPERTY_BORDER_TOP_COLOR:
case GTK_CSS_PROPERTY_BORDER_RIGHT_COLOR:
case GTK_CSS_PROPERTY_BORDER_BOTTOM_COLOR:
case GTK_CSS_PROPERTY_BORDER_LEFT_COLOR:
case GTK_CSS_PROPERTY_OUTLINE_COLOR:
return _gtk_css_value_compute (_gtk_css_style_property_get_initial_value (_gtk_css_style_property_lookup_by_id (property_id)),
property_id,
provider,
values,
parent_values,
NULL);
default:
if (property_id < GTK_CSS_PROPERTY_N_PROPERTIES)
g_warning ("No fallback color defined for property '%s'",
_gtk_style_property_get_name (GTK_STYLE_PROPERTY (_gtk_css_style_property_lookup_by_id (property_id))));
return _gtk_css_rgba_value_new_from_rgba (&transparent);
}
}
static GtkCssValue *
gtk_css_value_symbolic_compute (GtkCssValue *value,
guint property_id,
GtkStyleProviderPrivate *provider,
GtkCssComputedValues *values,
GtkCssComputedValues *parent_values,
GtkCssDependencies *dependencies)
{
GtkCssValue *resolved, *current;
GtkCssDependencies current_deps;
/* The computed value of the ‘currentColor’ keyword is the computed
* value of the ‘color’ property. If the ‘currentColor’ keyword is
* set on the ‘color’ property itself, it is treated as ‘color: inherit’.
*/
if (property_id == GTK_CSS_PROPERTY_COLOR)
{
if (parent_values)
{
current = _gtk_css_computed_values_get_value (parent_values, GTK_CSS_PROPERTY_COLOR);
current_deps = GTK_CSS_EQUALS_PARENT;
}
else
{
current = _gtk_css_style_property_get_initial_value (_gtk_css_style_property_lookup_by_id (GTK_CSS_PROPERTY_COLOR));
current_deps = 0;
}
}
else
{
current = _gtk_css_computed_values_get_value (values, GTK_CSS_PROPERTY_COLOR);
current_deps = GTK_CSS_DEPENDS_ON_COLOR;
}
resolved = _gtk_symbolic_color_resolve_full ((GtkSymbolicColor *) value,
provider,
current,
current_deps,
dependencies);
if (resolved == NULL)
return gtk_css_value_symbolic_get_fallback (property_id, provider, values, parent_values);
return resolved;
}
static gboolean
gtk_css_value_symbolic_equal (const GtkCssValue *value1,
const GtkCssValue *value2)
{
GtkSymbolicColor *color1 = (GtkSymbolicColor *) value1;
GtkSymbolicColor *color2 = (GtkSymbolicColor *) value2;
if (color1->type != color2->type)
return FALSE;
switch (color1->type)
{
case COLOR_TYPE_LITERAL:
return _gtk_css_value_equal (color1->last_value, color2->last_value);
case COLOR_TYPE_NAME:
return g_str_equal (color1->name, color2->name);
case COLOR_TYPE_SHADE:
return color1->shade.factor == color2->shade.factor &&
_gtk_css_value_equal ((GtkCssValue *) color1->shade.color,
(GtkCssValue *) color2->shade.color);
case COLOR_TYPE_ALPHA:
return color1->alpha.factor == color2->alpha.factor &&
_gtk_css_value_equal ((GtkCssValue *) color1->alpha.color,
(GtkCssValue *) color2->alpha.color);
case COLOR_TYPE_MIX:
return color1->mix.factor == color2->mix.factor &&
_gtk_css_value_equal ((GtkCssValue *) color1->mix.color1,
(GtkCssValue *) color2->mix.color1) &&
_gtk_css_value_equal ((GtkCssValue *) color1->mix.color2,
(GtkCssValue *) color2->mix.color2);
case COLOR_TYPE_WIN32:
return g_str_equal (color1->win32.theme_class, color2->win32.theme_class) &&
color1->win32.id == color2->win32.id;
case COLOR_TYPE_CURRENT_COLOR:
return TRUE;
default:
g_assert_not_reached ();
return FALSE;
}
}
static GtkCssValue *
gtk_css_value_symbolic_transition (GtkCssValue *start,
GtkCssValue *end,
guint property_id,
double progress)
{
return (GtkCssValue *) gtk_symbolic_color_new_mix ((GtkSymbolicColor *) start,
(GtkSymbolicColor *) end,
progress);
}
static void
gtk_css_value_symbolic_print (const GtkCssValue *value,
GString *string)
{
GtkSymbolicColor *color = (GtkSymbolicColor *) value;
char *s;
s = gtk_symbolic_color_to_string (color);
g_string_append (string, s);
g_free (s);
}
static const GtkCssValueClass GTK_CSS_VALUE_SYMBOLIC = {
gtk_css_value_symbolic_free,
gtk_css_value_symbolic_compute,
gtk_css_value_symbolic_equal,
gtk_css_value_symbolic_transition,
gtk_css_value_symbolic_print
};
/**
* gtk_symbolic_color_new_literal:
* @color: a #GdkRGBA
*
* Creates a symbolic color pointing to a literal color.
*
* Returns: a newly created #GtkSymbolicColor
*
* Since: 3.0
**/
GtkSymbolicColor *
gtk_symbolic_color_new_literal (const GdkRGBA *color)
{
GtkSymbolicColor *symbolic_color;
g_return_val_if_fail (color != NULL, NULL);
symbolic_color = _gtk_css_value_new (GtkSymbolicColor, &GTK_CSS_VALUE_SYMBOLIC);
symbolic_color->type = COLOR_TYPE_LITERAL;
symbolic_color->last_value = _gtk_css_rgba_value_new_from_rgba (color);
return symbolic_color;
}
/**
* gtk_symbolic_color_new_name:
* @name: color name
*
* Creates a symbolic color pointing to an unresolved named
* color. See gtk_style_context_lookup_color() and
* gtk_style_properties_lookup_color().
*
* Returns: a newly created #GtkSymbolicColor
*
* Since: 3.0
**/
GtkSymbolicColor *
gtk_symbolic_color_new_name (const gchar *name)
{
GtkSymbolicColor *symbolic_color;
g_return_val_if_fail (name != NULL, NULL);
symbolic_color = _gtk_css_value_new (GtkSymbolicColor, &GTK_CSS_VALUE_SYMBOLIC);
symbolic_color->type = COLOR_TYPE_NAME;
symbolic_color->name = g_strdup (name);
return symbolic_color;
}
/**
* gtk_symbolic_color_new_shade: (constructor)
* @color: another #GtkSymbolicColor
* @factor: shading factor to apply to @color
*
* Creates a symbolic color defined as a shade of
* another color. A factor > 1.0 would resolve to
* a brighter color, while < 1.0 would resolve to
* a darker color.
*
* Returns: A newly created #GtkSymbolicColor
*
* Since: 3.0
**/
GtkSymbolicColor *
gtk_symbolic_color_new_shade (GtkSymbolicColor *color,
gdouble factor)
{
GtkSymbolicColor *symbolic_color;
g_return_val_if_fail (color != NULL, NULL);
symbolic_color = _gtk_css_value_new (GtkSymbolicColor, &GTK_CSS_VALUE_SYMBOLIC);
symbolic_color->type = COLOR_TYPE_SHADE;
symbolic_color->shade.color = gtk_symbolic_color_ref (color);
symbolic_color->shade.factor = factor;
return symbolic_color;
}
/**
* gtk_symbolic_color_new_alpha: (constructor)
* @color: another #GtkSymbolicColor
* @factor: factor to apply to @color alpha
*
* Creates a symbolic color by modifying the relative alpha
* value of @color. A factor < 1.0 would resolve to a more
* transparent color, while > 1.0 would resolve to a more
* opaque color.
*
* Returns: A newly created #GtkSymbolicColor
*
* Since: 3.0
**/
GtkSymbolicColor *
gtk_symbolic_color_new_alpha (GtkSymbolicColor *color,
gdouble factor)
{
GtkSymbolicColor *symbolic_color;
g_return_val_if_fail (color != NULL, NULL);
symbolic_color = _gtk_css_value_new (GtkSymbolicColor, &GTK_CSS_VALUE_SYMBOLIC);
symbolic_color->type = COLOR_TYPE_ALPHA;
symbolic_color->alpha.color = gtk_symbolic_color_ref (color);
symbolic_color->alpha.factor = factor;
return symbolic_color;
}
/**
* gtk_symbolic_color_new_mix: (constructor)
* @color1: color to mix
* @color2: another color to mix
* @factor: mix factor
*
* Creates a symbolic color defined as a mix of another
* two colors. a mix factor of 0 would resolve to @color1,
* while a factor of 1 would resolve to @color2.
*
* Returns: A newly created #GtkSymbolicColor
*
* Since: 3.0
**/
GtkSymbolicColor *
gtk_symbolic_color_new_mix (GtkSymbolicColor *color1,
GtkSymbolicColor *color2,
gdouble factor)
{
GtkSymbolicColor *symbolic_color;
g_return_val_if_fail (color1 != NULL, NULL);
g_return_val_if_fail (color1 != NULL, NULL);
symbolic_color = _gtk_css_value_new (GtkSymbolicColor, &GTK_CSS_VALUE_SYMBOLIC);
symbolic_color->type = COLOR_TYPE_MIX;
symbolic_color->mix.color1 = gtk_symbolic_color_ref (color1);
symbolic_color->mix.color2 = gtk_symbolic_color_ref (color2);
symbolic_color->mix.factor = factor;
return symbolic_color;
}
/**
* gtk_symbolic_color_new_win32: (constructor)
* @theme_class: The theme class to pull color from
* @id: The color id
*
* Creates a symbolic color based on the current win32
* theme.
*
* Note that while this call is available on all platforms
* the actual value returned is not reliable on non-win32
* platforms.
*
* Returns: A newly created #GtkSymbolicColor
*
* Since: 3.4
*/
GtkSymbolicColor *
gtk_symbolic_color_new_win32 (const gchar *theme_class,
gint id)
{
GtkSymbolicColor *symbolic_color;
g_return_val_if_fail (theme_class != NULL, NULL);
symbolic_color = _gtk_css_value_new (GtkSymbolicColor, &GTK_CSS_VALUE_SYMBOLIC);
symbolic_color->type = COLOR_TYPE_WIN32;
symbolic_color->win32.theme_class = g_strdup (theme_class);
symbolic_color->win32.id = id;
return symbolic_color;
}
/**
* _gtk_symbolic_color_get_current_color:
*
* Gets the color representing the CSS 'currentColor' keyword.
* This color will resolve to the color set for the color property.
*
* Returns: (transfer none): The singleton representing the
* 'currentColor' keyword
**/
GtkSymbolicColor *
_gtk_symbolic_color_get_current_color (void)
{
static GtkSymbolicColor *current_color = NULL;
if (G_UNLIKELY (current_color == NULL))
{
current_color = _gtk_css_value_new (GtkSymbolicColor, &GTK_CSS_VALUE_SYMBOLIC);
current_color->type = COLOR_TYPE_CURRENT_COLOR;
}
return current_color;
}
/**
* gtk_symbolic_color_ref:
* @color: a #GtkSymbolicColor
*
* Increases the reference count of @color
*
* Returns: the same @color
*
* Since: 3.0
**/
GtkSymbolicColor *
gtk_symbolic_color_ref (GtkSymbolicColor *color)
{
g_return_val_if_fail (color != NULL, NULL);
_gtk_css_value_ref ((GtkCssValue *) color);
return color;
}
/**
* gtk_symbolic_color_unref:
* @color: a #GtkSymbolicColor
*
* Decreases the reference count of @color, freeing its memory if the
* reference count reaches 0.
*
* Since: 3.0
**/
void
gtk_symbolic_color_unref (GtkSymbolicColor *color)
{
g_return_if_fail (color != NULL);
_gtk_css_value_unref ((GtkCssValue *) color);
}
static void
rgb_to_hls (gdouble *r,
gdouble *g,
gdouble *b)
{
gdouble min;
gdouble max;
gdouble red;
gdouble green;
gdouble blue;
gdouble h, l, s;
gdouble delta;
red = *r;
green = *g;
blue = *b;
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 - max - min);
delta = max -min;
if (red == max)
h = (green - blue) / delta;
else if (green == max)
h = 2 + (blue - red) / delta;
else if (blue == max)
h = 4 + (red - green) / delta;
h *= 60;
if (h < 0.0)
h += 360;
}
*r = h;
*g = l;
*b = s;
}
static void
hls_to_rgb (gdouble *h,
gdouble *l,
gdouble *s)
{
gdouble hue;
gdouble lightness;
gdouble saturation;
gdouble m1, m2;
gdouble r, g, b;
lightness = *l;
saturation = *s;
if (lightness <= 0.5)
m2 = lightness * (1 + saturation);
else
m2 = lightness + saturation - lightness * saturation;
m1 = 2 * lightness - m2;
if (saturation == 0)
{
*h = lightness;
*l = lightness;
*s = lightness;
}
else
{
hue = *h + 120;
while (hue > 360)
hue -= 360;
while (hue < 0)
hue += 360;
if (hue < 60)
r = m1 + (m2 - m1) * hue / 60;
else if (hue < 180)
r = m2;
else if (hue < 240)
r = m1 + (m2 - m1) * (240 - hue) / 60;
else
r = m1;
hue = *h;
while (hue > 360)
hue -= 360;
while (hue < 0)
hue += 360;
if (hue < 60)
g = m1 + (m2 - m1) * hue / 60;
else if (hue < 180)
g = m2;
else if (hue < 240)
g = m1 + (m2 - m1) * (240 - hue) / 60;
else
g = m1;
hue = *h - 120;
while (hue > 360)
hue -= 360;
while (hue < 0)
hue += 360;
if (hue < 60)
b = m1 + (m2 - m1) * hue / 60;
else if (hue < 180)
b = m2;
else if (hue < 240)
b = m1 + (m2 - m1) * (240 - hue) / 60;
else
b = m1;
*h = r;
*l = g;
*s = b;
}
}
static void
_shade_color (GdkRGBA *color,
gdouble factor)
{
GdkRGBA temp;
temp = *color;
rgb_to_hls (&temp.red, &temp.green, &temp.blue);
temp.green *= factor;
if (temp.green > 1.0)
temp.green = 1.0;
else if (temp.green < 0.0)
temp.green = 0.0;
temp.blue *= factor;
if (temp.blue > 1.0)
temp.blue = 1.0;
else if (temp.blue < 0.0)
temp.blue = 0.0;
hls_to_rgb (&temp.red, &temp.green, &temp.blue);
*color = temp;
}
/**
* gtk_symbolic_color_resolve:
* @color: a #GtkSymbolicColor
* @props: (allow-none): #GtkStyleProperties to use when resolving
* named colors, or %NULL
* @resolved_color: (out): return location for the resolved color
*
* If @color is resolvable, @resolved_color will be filled in
* with the resolved color, and %TRUE will be returned. Generally,
* if @color can't be resolved, it is due to it being defined on
* top of a named color that doesn't exist in @props.
*
* When @props is %NULL, resolving of named colors will fail, so if
* your @color is or references such a color, this function will
* return %FALSE.
*
* Returns: %TRUE if the color has been resolved
*
* Since: 3.0
**/
gboolean
gtk_symbolic_color_resolve (GtkSymbolicColor *color,
GtkStyleProperties *props,
GdkRGBA *resolved_color)
{
GdkRGBA pink = { 1.0, 0.5, 0.5, 1.0 };
GtkCssValue *v, *current;
g_return_val_if_fail (color != NULL, FALSE);
g_return_val_if_fail (resolved_color != NULL, FALSE);
g_return_val_if_fail (props == NULL || GTK_IS_STYLE_PROPERTIES (props), FALSE);
current = _gtk_css_rgba_value_new_from_rgba (&pink);
v =_gtk_symbolic_color_resolve_full (color,
GTK_STYLE_PROVIDER_PRIVATE (props),
current,
0,
NULL);
_gtk_css_value_unref (current);
if (v == NULL)
return FALSE;
*resolved_color = *_gtk_css_rgba_value_get_rgba (v);
_gtk_css_value_unref (v);
return TRUE;
}
GtkCssValue *
_gtk_symbolic_color_resolve_full (GtkSymbolicColor *color,
GtkStyleProviderPrivate *provider,
GtkCssValue *current,
GtkCssDependencies current_deps,
GtkCssDependencies *dependencies)
{
GtkCssDependencies unused;
GtkCssValue *value;
g_return_val_if_fail (color != NULL, FALSE);
g_return_val_if_fail (provider == NULL || GTK_IS_STYLE_PROVIDER_PRIVATE (provider), FALSE);
g_return_val_if_fail (current != NULL, FALSE);
if (dependencies == NULL)
dependencies = &unused;
*dependencies = 0;
value = NULL;
switch (color->type)
{
case COLOR_TYPE_LITERAL:
return _gtk_css_value_ref (color->last_value);
case COLOR_TYPE_NAME:
{
GtkSymbolicColor *named_color;
named_color = _gtk_style_provider_private_get_color (provider, color->name);
if (!named_color)
return NULL;
return _gtk_symbolic_color_resolve_full (named_color, provider, current, current_deps, dependencies);
}
break;
case COLOR_TYPE_SHADE:
{
GtkCssValue *val;
GdkRGBA shade;
val = _gtk_symbolic_color_resolve_full (color->shade.color, provider, current, current_deps, dependencies);
if (val == NULL)
return NULL;
*dependencies = _gtk_css_dependencies_union (*dependencies, 0);
shade = *_gtk_css_rgba_value_get_rgba (val);
_shade_color (&shade, color->shade.factor);
_gtk_css_value_unref (val);
value = _gtk_css_rgba_value_new_from_rgba (&shade);
}
break;
case COLOR_TYPE_ALPHA:
{
GtkCssValue *val;
GdkRGBA alpha;
val = _gtk_symbolic_color_resolve_full (color->alpha.color, provider, current, current_deps, dependencies);
if (val == NULL)
return NULL;
*dependencies = _gtk_css_dependencies_union (*dependencies, 0);
alpha = *_gtk_css_rgba_value_get_rgba (val);
alpha.alpha = CLAMP (alpha.alpha * color->alpha.factor, 0, 1);
_gtk_css_value_unref (val);
value = _gtk_css_rgba_value_new_from_rgba (&alpha);
}
break;
case COLOR_TYPE_MIX:
{
GtkCssValue *val;
GdkRGBA color1, color2, res;
GtkCssDependencies dep1, dep2;
val = _gtk_symbolic_color_resolve_full (color->mix.color1, provider, current, current_deps, &dep1);
if (val == NULL)
return NULL;
color1 = *_gtk_css_rgba_value_get_rgba (val);
_gtk_css_value_unref (val);
val = _gtk_symbolic_color_resolve_full (color->mix.color2, provider, current, current_deps, &dep2);
if (val == NULL)
return NULL;
color2 = *_gtk_css_rgba_value_get_rgba (val);
_gtk_css_value_unref (val);
*dependencies = _gtk_css_dependencies_union (dep1, dep2);
res.red = CLAMP (color1.red + ((color2.red - color1.red) * color->mix.factor), 0, 1);
res.green = CLAMP (color1.green + ((color2.green - color1.green) * color->mix.factor), 0, 1);
res.blue = CLAMP (color1.blue + ((color2.blue - color1.blue) * color->mix.factor), 0, 1);
res.alpha = CLAMP (color1.alpha + ((color2.alpha - color1.alpha) * color->mix.factor), 0, 1);
value =_gtk_css_rgba_value_new_from_rgba (&res);
}
break;
case COLOR_TYPE_WIN32:
{
GdkRGBA res;
if (!_gtk_win32_theme_color_resolve (color->win32.theme_class,
color->win32.id,
&res))
return NULL;
value = _gtk_css_rgba_value_new_from_rgba (&res);
}
break;
case COLOR_TYPE_CURRENT_COLOR:
if (current)
{
*dependencies = current_deps;
return _gtk_css_value_ref (current);
}
else
{
return NULL;
}
break;
default:
g_assert_not_reached ();
}
if (value != NULL)
{
if (color->last_value != NULL &&
_gtk_css_value_equal (color->last_value, value))
{
_gtk_css_value_unref (value);
value = _gtk_css_value_ref (color->last_value);
}
else
{
if (color->last_value != NULL)
_gtk_css_value_unref (color->last_value);
color->last_value = _gtk_css_value_ref (value);
}
}
_gtk_css_rgba_value_get_rgba (value);
return value;
}
/**
* gtk_symbolic_color_to_string:
* @color: color to convert to a string
*
* Converts the given @color to a string representation. This is useful
* both for debugging and for serialization of strings. The format of
* the string may change between different versions of GTK, but it is
* guaranteed that the GTK css parser is able to read the string and
* create the same symbolic color from it.
*
* Returns: a new string representing @color
**/
char *
gtk_symbolic_color_to_string (GtkSymbolicColor *color)
{
char *s;
g_return_val_if_fail (color != NULL, NULL);
switch (color->type)
{
case COLOR_TYPE_LITERAL:
s = gdk_rgba_to_string (_gtk_css_rgba_value_get_rgba (color->last_value));
break;
case COLOR_TYPE_NAME:
s = g_strconcat ("@", color->name, NULL);
break;
case COLOR_TYPE_SHADE:
{
char *color_string = gtk_symbolic_color_to_string (color->shade.color);
char factor[G_ASCII_DTOSTR_BUF_SIZE];
g_ascii_dtostr (factor, sizeof (factor), color->shade.factor);
s = g_strdup_printf ("shade (%s, %s)", color_string, factor);
g_free (color_string);
}
break;
case COLOR_TYPE_ALPHA:
{
char *color_string = gtk_symbolic_color_to_string (color->shade.color);
char factor[G_ASCII_DTOSTR_BUF_SIZE];
g_ascii_dtostr (factor, sizeof (factor), color->alpha.factor);
s = g_strdup_printf ("alpha (%s, %s)", color_string, factor);
g_free (color_string);
}
break;
case COLOR_TYPE_MIX:
{
char *color_string1 = gtk_symbolic_color_to_string (color->mix.color1);
char *color_string2 = gtk_symbolic_color_to_string (color->mix.color2);
char factor[G_ASCII_DTOSTR_BUF_SIZE];
g_ascii_dtostr (factor, sizeof (factor), color->mix.factor);
s = g_strdup_printf ("mix (%s, %s, %s)", color_string1, color_string2, factor);
g_free (color_string1);
g_free (color_string2);
}
break;
case COLOR_TYPE_WIN32:
{
s = g_strdup_printf (GTK_WIN32_THEME_SYMBOLIC_COLOR_NAME"(%s, %d)",
color->win32.theme_class, color->win32.id);
}
break;
case COLOR_TYPE_CURRENT_COLOR:
s = g_strdup ("currentColor");
break;
default:
g_assert_not_reached ();
}
return s;
}
typedef enum {
COLOR_RGBA,
COLOR_RGB,
COLOR_LIGHTER,
COLOR_DARKER,
COLOR_SHADE,
COLOR_ALPHA,
COLOR_MIX,
COLOR_WIN32
} ColorParseType;
static GtkSymbolicColor * gtk_css_parser_read_symbolic_color (GtkCssParser *parser);
static GtkSymbolicColor *
gtk_css_parser_read_symbolic_color_function (GtkCssParser *parser,
ColorParseType color)
{
GtkSymbolicColor *symbolic;
GtkSymbolicColor *child1, *child2;
double value;
if (!_gtk_css_parser_try (parser, "(", TRUE))
{
_gtk_css_parser_error (parser, "Missing opening bracket in color definition");
return NULL;
}
if (color == COLOR_RGB || color == COLOR_RGBA)
{
GdkRGBA rgba;
double tmp;
guint i;
for (i = 0; i < 3; i++)
{
if (i > 0 && !_gtk_css_parser_try (parser, ",", TRUE))
{
_gtk_css_parser_error (parser, "Expected ',' in color definition");
return NULL;
}
if (!_gtk_css_parser_try_double (parser, &tmp))
{
_gtk_css_parser_error (parser, "Invalid number for color value");
return NULL;
}
if (_gtk_css_parser_try (parser, "%", TRUE))
tmp /= 100.0;
else
tmp /= 255.0;
if (i == 0)
rgba.red = tmp;
else if (i == 1)
rgba.green = tmp;
else if (i == 2)
rgba.blue = tmp;
else
g_assert_not_reached ();
}
if (color == COLOR_RGBA)
{
if (i > 0 && !_gtk_css_parser_try (parser, ",", TRUE))
{
_gtk_css_parser_error (parser, "Expected ',' in color definition");
return NULL;
}
if (!_gtk_css_parser_try_double (parser, &rgba.alpha))
{
_gtk_css_parser_error (parser, "Invalid number for alpha value");
return NULL;
}
}
else
rgba.alpha = 1.0;
symbolic = gtk_symbolic_color_new_literal (&rgba);
}
else if (color == COLOR_WIN32)
{
symbolic = _gtk_win32_theme_color_parse (parser);
if (symbolic == NULL)
return NULL;
}
else
{
child1 = gtk_css_parser_read_symbolic_color (parser);
if (child1 == NULL)
return NULL;
if (color == COLOR_MIX)
{
if (!_gtk_css_parser_try (parser, ",", TRUE))
{
_gtk_css_parser_error (parser, "Expected ',' in color definition");
gtk_symbolic_color_unref (child1);
return NULL;
}
child2 = gtk_css_parser_read_symbolic_color (parser);
if (child2 == NULL)
{
gtk_symbolic_color_unref (child1);
return NULL;
}
}
else
child2 = NULL;
if (color == COLOR_LIGHTER)
value = 1.3;
else if (color == COLOR_DARKER)
value = 0.7;
else
{
if (!_gtk_css_parser_try (parser, ",", TRUE))
{
_gtk_css_parser_error (parser, "Expected ',' in color definition");
gtk_symbolic_color_unref (child1);
if (child2)
gtk_symbolic_color_unref (child2);
return NULL;
}
if (!_gtk_css_parser_try_double (parser, &value))
{
_gtk_css_parser_error (parser, "Expected number in color definition");
gtk_symbolic_color_unref (child1);
if (child2)
gtk_symbolic_color_unref (child2);
return NULL;
}
}
switch (color)
{
case COLOR_LIGHTER:
case COLOR_DARKER:
case COLOR_SHADE:
symbolic = gtk_symbolic_color_new_shade (child1, value);
break;
case COLOR_ALPHA:
symbolic = gtk_symbolic_color_new_alpha (child1, value);
break;
case COLOR_MIX:
symbolic = gtk_symbolic_color_new_mix (child1, child2, value);
break;
default:
g_assert_not_reached ();
symbolic = NULL;
}
gtk_symbolic_color_unref (child1);
if (child2)
gtk_symbolic_color_unref (child2);
}
if (!_gtk_css_parser_try (parser, ")", TRUE))
{
_gtk_css_parser_error (parser, "Expected ')' in color definition");
gtk_symbolic_color_unref (symbolic);
return NULL;
}
return symbolic;
}
static GtkSymbolicColor *
gtk_css_parser_read_symbolic_color (GtkCssParser *parser)
{
GtkSymbolicColor *symbolic;
GdkRGBA rgba;
guint color;
const char *names[] = {"rgba", "rgb", "lighter", "darker", "shade", "alpha", "mix",
GTK_WIN32_THEME_SYMBOLIC_COLOR_NAME};
char *name;
if (_gtk_css_parser_try (parser, "currentColor", TRUE))
return gtk_symbolic_color_ref (_gtk_symbolic_color_get_current_color ());
if (_gtk_css_parser_try (parser, "transparent", TRUE))
{
GdkRGBA transparent = { 0, 0, 0, 0 };
return gtk_symbolic_color_new_literal (&transparent);
}
if (_gtk_css_parser_try (parser, "@", FALSE))
{
name = _gtk_css_parser_try_name (parser, TRUE);
if (name)
{
symbolic = gtk_symbolic_color_new_name (name);
}
else
{
_gtk_css_parser_error (parser, "'%s' is not a valid symbolic color name", name);
symbolic = NULL;
}
g_free (name);
return symbolic;
}
for (color = 0; color < G_N_ELEMENTS (names); color++)
{
if (_gtk_css_parser_try (parser, names[color], TRUE))
break;
}
if (color < G_N_ELEMENTS (names))
return gtk_css_parser_read_symbolic_color_function (parser, color);
if (_gtk_css_parser_try_hash_color (parser, &rgba))
return gtk_symbolic_color_new_literal (&rgba);
name = _gtk_css_parser_try_name (parser, TRUE);
if (name)
{
if (gdk_rgba_parse (&rgba, name))
{
symbolic = gtk_symbolic_color_new_literal (&rgba);
}
else
{
_gtk_css_parser_error (parser, "'%s' is not a valid color name", name);
symbolic = NULL;
}
g_free (name);
return symbolic;
}
_gtk_css_parser_error (parser, "Not a color definition");
return NULL;
}
GtkCssValue *
_gtk_css_symbolic_value_new (GtkCssParser *parser)
{
g_return_val_if_fail (parser != NULL, NULL);
return _gtk_css_symbolic_value_new_take_symbolic_color (gtk_css_parser_read_symbolic_color (parser));
}
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