gtk2/gtk/gtkcsscolorvalue.c
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... and gtk_css_parser_has_function().
2019-04-12 19:34:28 +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 "gtkcsscolorvalueprivate.h"
#include "gtkcssrgbavalueprivate.h"
#include "gtkcssstylepropertyprivate.h"
#include "gtkhslaprivate.h"
#include "gtkstylepropertyprivate.h"
#include "gtkprivate.h"
typedef enum {
COLOR_TYPE_LITERAL,
COLOR_TYPE_NAME,
COLOR_TYPE_SHADE,
COLOR_TYPE_ALPHA,
COLOR_TYPE_MIX,
COLOR_TYPE_CURRENT_COLOR
} ColorType;
struct _GtkCssValue
{
GTK_CSS_VALUE_BASE
ColorType type;
GtkCssValue *last_value;
union
{
gchar *name;
struct
{
GtkCssValue *color;
gdouble factor;
} shade, alpha;
struct
{
GtkCssValue *color1;
GtkCssValue *color2;
gdouble factor;
} mix;
} sym_col;
};
static void
gtk_css_value_color_free (GtkCssValue *color)
{
if (color->last_value)
_gtk_css_value_unref (color->last_value);
switch (color->type)
{
case COLOR_TYPE_NAME:
g_free (color->sym_col.name);
break;
case COLOR_TYPE_SHADE:
_gtk_css_value_unref (color->sym_col.shade.color);
break;
case COLOR_TYPE_ALPHA:
_gtk_css_value_unref (color->sym_col.alpha.color);
break;
case COLOR_TYPE_MIX:
_gtk_css_value_unref (color->sym_col.mix.color1);
_gtk_css_value_unref (color->sym_col.mix.color2);
break;
case COLOR_TYPE_LITERAL:
case COLOR_TYPE_CURRENT_COLOR:
default:
break;
}
g_slice_free (GtkCssValue, color);
}
static GtkCssValue *
gtk_css_value_color_get_fallback (guint property_id,
GtkStyleProvider *provider,
GtkCssStyle *style,
GtkCssStyle *parent_style)
{
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:
case GTK_CSS_PROPERTY_CARET_COLOR:
case GTK_CSS_PROPERTY_SECONDARY_CARET_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,
style,
parent_style);
case GTK_CSS_PROPERTY_ICON_PALETTE:
return _gtk_css_value_ref (gtk_css_style_get_value (style, GTK_CSS_PROPERTY_COLOR));
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);
}
}
GtkCssValue *
_gtk_css_color_value_resolve (GtkCssValue *color,
GtkStyleProvider *provider,
GtkCssValue *current,
GSList *cycle_list)
{
GtkCssValue *value;
gtk_internal_return_val_if_fail (color != NULL, NULL);
switch (color->type)
{
case COLOR_TYPE_LITERAL:
return _gtk_css_value_ref (color->last_value);
case COLOR_TYPE_NAME:
{
GtkCssValue *named;
GSList cycle = { color, cycle_list };
/* If color exists in cycle_list, we're currently resolving it.
* So we've detected a cycle. */
if (g_slist_find (cycle_list, color))
return NULL;
named = gtk_style_provider_get_color (provider, color->sym_col.name);
if (named == NULL)
return NULL;
value = _gtk_css_color_value_resolve (named, provider, current, &cycle);
if (value == NULL)
return NULL;
}
break;
case COLOR_TYPE_SHADE:
{
GtkCssValue *val;
GtkHSLA hsla;
GdkRGBA shade;
val = _gtk_css_color_value_resolve (color->sym_col.shade.color, provider, current, cycle_list);
if (val == NULL)
return NULL;
_gtk_hsla_init_from_rgba (&hsla, _gtk_css_rgba_value_get_rgba (val));
_gtk_hsla_shade (&hsla, &hsla, color->sym_col.shade.factor);
_gdk_rgba_init_from_hsla (&shade, &hsla);
_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_css_color_value_resolve (color->sym_col.alpha.color, provider, current, cycle_list);
if (val == NULL)
return NULL;
alpha = *_gtk_css_rgba_value_get_rgba (val);
alpha.alpha = CLAMP (alpha.alpha * color->sym_col.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;
val = _gtk_css_color_value_resolve (color->sym_col.mix.color1, provider, current, cycle_list);
if (val == NULL)
return NULL;
color1 = *_gtk_css_rgba_value_get_rgba (val);
_gtk_css_value_unref (val);
val = _gtk_css_color_value_resolve (color->sym_col.mix.color2, provider, current, cycle_list);
if (val == NULL)
return NULL;
color2 = *_gtk_css_rgba_value_get_rgba (val);
_gtk_css_value_unref (val);
res.red = CLAMP (color1.red + ((color2.red - color1.red) * color->sym_col.mix.factor), 0, 1);
res.green = CLAMP (color1.green + ((color2.green - color1.green) * color->sym_col.mix.factor), 0, 1);
res.blue = CLAMP (color1.blue + ((color2.blue - color1.blue) * color->sym_col.mix.factor), 0, 1);
res.alpha = CLAMP (color1.alpha + ((color2.alpha - color1.alpha) * color->sym_col.mix.factor), 0, 1);
value =_gtk_css_rgba_value_new_from_rgba (&res);
}
break;
case COLOR_TYPE_CURRENT_COLOR:
if (current)
{
return _gtk_css_value_ref (current);
}
else
{
return _gtk_css_color_value_resolve (_gtk_css_style_property_get_initial_value (_gtk_css_style_property_lookup_by_id (GTK_CSS_PROPERTY_COLOR)),
provider,
NULL,
cycle_list);
}
break;
default:
value = NULL;
g_assert_not_reached ();
}
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);
}
return value;
}
static GtkCssValue *
gtk_css_value_color_compute (GtkCssValue *value,
guint property_id,
GtkStyleProvider *provider,
GtkCssStyle *style,
GtkCssStyle *parent_style)
{
GtkCssValue *resolved, *current;
/* 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_style)
current = gtk_css_style_get_value (parent_style, GTK_CSS_PROPERTY_COLOR);
else
current = NULL;
}
else
{
current = gtk_css_style_get_value (style, GTK_CSS_PROPERTY_COLOR);
}
resolved = _gtk_css_color_value_resolve (value,
provider,
current,
NULL);
if (resolved == NULL)
return gtk_css_value_color_get_fallback (property_id, provider, style, parent_style);
return resolved;
}
static gboolean
gtk_css_value_color_equal (const GtkCssValue *value1,
const GtkCssValue *value2)
{
if (value1->type != value2->type)
return FALSE;
switch (value1->type)
{
case COLOR_TYPE_LITERAL:
return _gtk_css_value_equal (value1->last_value, value2->last_value);
case COLOR_TYPE_NAME:
return g_str_equal (value1->sym_col.name, value2->sym_col.name);
case COLOR_TYPE_SHADE:
return value1->sym_col.shade.factor == value2->sym_col.shade.factor &&
_gtk_css_value_equal (value1->sym_col.shade.color,
value2->sym_col.shade.color);
case COLOR_TYPE_ALPHA:
return value1->sym_col.alpha.factor == value2->sym_col.alpha.factor &&
_gtk_css_value_equal (value1->sym_col.alpha.color,
value2->sym_col.alpha.color);
case COLOR_TYPE_MIX:
return value1->sym_col.mix.factor == value2->sym_col.mix.factor &&
_gtk_css_value_equal (value1->sym_col.mix.color1,
value2->sym_col.mix.color1) &&
_gtk_css_value_equal (value1->sym_col.mix.color2,
value2->sym_col.mix.color2);
case COLOR_TYPE_CURRENT_COLOR:
return TRUE;
default:
g_assert_not_reached ();
return FALSE;
}
}
static GtkCssValue *
gtk_css_value_color_transition (GtkCssValue *start,
GtkCssValue *end,
guint property_id,
double progress)
{
return _gtk_css_color_value_new_mix (start, end, progress);
}
static void
gtk_css_value_color_print (const GtkCssValue *value,
GString *string)
{
switch (value->type)
{
case COLOR_TYPE_LITERAL:
_gtk_css_value_print (value->last_value, string);
break;
case COLOR_TYPE_NAME:
g_string_append (string, "@");
g_string_append (string, value->sym_col.name);
break;
case COLOR_TYPE_SHADE:
{
char factor[G_ASCII_DTOSTR_BUF_SIZE];
g_string_append (string, "shade(");
_gtk_css_value_print (value->sym_col.shade.color, string);
g_string_append (string, ", ");
g_ascii_dtostr (factor, sizeof (factor), value->sym_col.shade.factor);
g_string_append (string, factor);
g_string_append (string, ")");
}
break;
case COLOR_TYPE_ALPHA:
{
char factor[G_ASCII_DTOSTR_BUF_SIZE];
g_string_append (string, "alpha(");
_gtk_css_value_print (value->sym_col.alpha.color, string);
g_string_append (string, ", ");
g_ascii_dtostr (factor, sizeof (factor), value->sym_col.alpha.factor);
g_string_append (string, factor);
g_string_append (string, ")");
}
break;
case COLOR_TYPE_MIX:
{
char factor[G_ASCII_DTOSTR_BUF_SIZE];
g_string_append (string, "mix(");
_gtk_css_value_print (value->sym_col.mix.color1, string);
g_string_append (string, ", ");
_gtk_css_value_print (value->sym_col.mix.color2, string);
g_string_append (string, ", ");
g_ascii_dtostr (factor, sizeof (factor), value->sym_col.mix.factor);
g_string_append (string, factor);
g_string_append (string, ")");
}
break;
case COLOR_TYPE_CURRENT_COLOR:
g_string_append (string, "currentColor");
break;
default:
g_assert_not_reached ();
}
}
static const GtkCssValueClass GTK_CSS_VALUE_COLOR = {
gtk_css_value_color_free,
gtk_css_value_color_compute,
gtk_css_value_color_equal,
gtk_css_value_color_transition,
NULL,
NULL,
gtk_css_value_color_print
};
GtkCssValue *
_gtk_css_color_value_new_literal (const GdkRGBA *color)
{
GtkCssValue *value;
g_return_val_if_fail (color != NULL, NULL);
value = _gtk_css_value_new (GtkCssValue, &GTK_CSS_VALUE_COLOR);
value->type = COLOR_TYPE_LITERAL;
value->last_value = _gtk_css_rgba_value_new_from_rgba (color);
return value;
}
GtkCssValue *
_gtk_css_color_value_new_rgba (double red,
double green,
double blue,
double alpha)
{
GdkRGBA rgba = { red, green, blue, alpha };
return _gtk_css_color_value_new_literal (&rgba);
}
GtkCssValue *
_gtk_css_color_value_new_name (const gchar *name)
{
GtkCssValue *value;
gtk_internal_return_val_if_fail (name != NULL, NULL);
value = _gtk_css_value_new (GtkCssValue, &GTK_CSS_VALUE_COLOR);
value->type = COLOR_TYPE_NAME;
value->sym_col.name = g_strdup (name);
return value;
}
GtkCssValue *
_gtk_css_color_value_new_shade (GtkCssValue *color,
gdouble factor)
{
GtkCssValue *value;
gtk_internal_return_val_if_fail (color->class == &GTK_CSS_VALUE_COLOR, NULL);
value = _gtk_css_value_new (GtkCssValue, &GTK_CSS_VALUE_COLOR);
value->type = COLOR_TYPE_SHADE;
value->sym_col.shade.color = _gtk_css_value_ref (color);
value->sym_col.shade.factor = factor;
return value;
}
GtkCssValue *
_gtk_css_color_value_new_alpha (GtkCssValue *color,
gdouble factor)
{
GtkCssValue *value;
gtk_internal_return_val_if_fail (color->class == &GTK_CSS_VALUE_COLOR, NULL);
value = _gtk_css_value_new (GtkCssValue, &GTK_CSS_VALUE_COLOR);
value->type = COLOR_TYPE_ALPHA;
value->sym_col.alpha.color = _gtk_css_value_ref (color);
value->sym_col.alpha.factor = factor;
return value;
}
GtkCssValue *
_gtk_css_color_value_new_mix (GtkCssValue *color1,
GtkCssValue *color2,
gdouble factor)
{
GtkCssValue *value;
gtk_internal_return_val_if_fail (color1->class == &GTK_CSS_VALUE_COLOR, NULL);
gtk_internal_return_val_if_fail (color2->class == &GTK_CSS_VALUE_COLOR, NULL);
value = _gtk_css_value_new (GtkCssValue, &GTK_CSS_VALUE_COLOR);
value->type = COLOR_TYPE_MIX;
value->sym_col.mix.color1 = _gtk_css_value_ref (color1);
value->sym_col.mix.color2 = _gtk_css_value_ref (color2);
value->sym_col.mix.factor = factor;
return value;
}
GtkCssValue *
_gtk_css_color_value_new_current_color (void)
{
static GtkCssValue current_color = { &GTK_CSS_VALUE_COLOR, 1, COLOR_TYPE_CURRENT_COLOR, NULL, };
return _gtk_css_value_ref (&current_color);
}
typedef enum {
COLOR_RGBA,
COLOR_RGB,
COLOR_LIGHTER,
COLOR_DARKER,
COLOR_SHADE,
COLOR_ALPHA,
COLOR_MIX
} ColorParseType;
static GtkCssValue *
_gtk_css_color_value_parse_function (GtkCssParser *parser,
ColorParseType color)
{
GtkCssValue *value;
GtkCssValue *child1, *child2;
double d;
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;
value = _gtk_css_color_value_new_literal (&rgba);
}
else
{
child1 = _gtk_css_color_value_parse (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_css_value_unref (child1);
return NULL;
}
child2 = _gtk_css_color_value_parse (parser);
if (child2 == NULL)
{
_gtk_css_value_unref (child1);
return NULL;
}
}
else
child2 = NULL;
if (color == COLOR_LIGHTER)
d = 1.3;
else if (color == COLOR_DARKER)
d = 0.7;
else
{
if (!_gtk_css_parser_try (parser, ",", TRUE))
{
_gtk_css_parser_error (parser, "Expected ',' in color definition");
_gtk_css_value_unref (child1);
if (child2)
_gtk_css_value_unref (child2);
return NULL;
}
if (!_gtk_css_parser_try_double (parser, &d))
{
_gtk_css_parser_error (parser, "Expected number in color definition");
_gtk_css_value_unref (child1);
if (child2)
_gtk_css_value_unref (child2);
return NULL;
}
}
switch (color)
{
case COLOR_LIGHTER:
case COLOR_DARKER:
case COLOR_SHADE:
value = _gtk_css_color_value_new_shade (child1, d);
break;
case COLOR_ALPHA:
value = _gtk_css_color_value_new_alpha (child1, d);
break;
case COLOR_MIX:
value = _gtk_css_color_value_new_mix (child1, child2, d);
break;
case COLOR_RGB:
case COLOR_RGBA:
default:
g_assert_not_reached ();
value = NULL;
}
_gtk_css_value_unref (child1);
if (child2)
_gtk_css_value_unref (child2);
}
if (!_gtk_css_parser_try (parser, ")", TRUE))
{
_gtk_css_parser_error (parser, "Expected ')' in color definition");
_gtk_css_value_unref (value);
return NULL;
}
return value;
}
GtkCssValue *
_gtk_css_color_value_parse (GtkCssParser *parser)
{
GtkCssValue *value;
GdkRGBA rgba;
guint color;
const char *names[] = {"rgba", "rgb", "lighter", "darker", "shade", "alpha", "mix"};
char *name;
if (gtk_css_parser_try_ident (parser, "currentColor"))
return _gtk_css_color_value_new_current_color ();
if (gtk_css_parser_try_ident (parser, "transparent"))
{
GdkRGBA transparent = { 0, 0, 0, 0 };
return _gtk_css_color_value_new_literal (&transparent);
}
if (_gtk_css_parser_try (parser, "@", FALSE))
{
name = _gtk_css_parser_try_name (parser, TRUE);
if (name)
{
value = _gtk_css_color_value_new_name (name);
}
else
{
_gtk_css_parser_error (parser, "'%s' is not a valid color color name", name);
value = NULL;
}
g_free (name);
return value;
}
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_color_value_parse_function (parser, color);
if (_gtk_css_parser_try_hash_color (parser, &rgba))
return _gtk_css_color_value_new_literal (&rgba);
name = _gtk_css_parser_try_name (parser, TRUE);
if (name)
{
if (gdk_rgba_parse (&rgba, name))
{
value = _gtk_css_color_value_new_literal (&rgba);
}
else
{
_gtk_css_parser_error (parser, "'%s' is not a valid color name", name);
value = NULL;
}
g_free (name);
return value;
}
_gtk_css_parser_error (parser, "Not a color definition");
return NULL;
}