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31aa5a0e53
gtk2/gtk/gtkcssdimensionvalue.c
Timm Bäder 31aa5a0e53 cssvalue: Add is_computed flag 
When a css value has "child" css values (e.g. a linear gradient has
several color stop css values) which are all computed (won't change when
compute() is called on them), we want to skip computing the entire
subtree.

Since css values are immutable, we can set the is_computed flag at
construct time.

Since GtkCssValue instances are 0-initialized in _gtk_css_value_alloc,
the default for is_computed it FALSE. This commit only sets it to TRUE
in a few cases, such as various "none" singleton values which will never
change. Later commits will refine this and set it for more values.
2020-01-18 08:49:51 +01:00

483 lines
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/* GTK - The GIMP Toolkit
* Copyright (C) 2011 Red Hat, Inc.
*
* 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 "gtkcssdimensionvalueprivate.h"
#include "gtkcssenumvalueprivate.h"
#include "gtkstylepropertyprivate.h"
#include "fallback-c89.c"
struct _GtkCssValue {
GTK_CSS_VALUE_BASE
GtkCssUnit unit;
double value;
};
static void
gtk_css_value_dimension_free (GtkCssValue *value)
{
g_slice_free (GtkCssValue, value);
}
static double
get_base_font_size_px (guint property_id,
GtkStyleProvider *provider,
GtkCssStyle *style,
GtkCssStyle *parent_style)
{
if (property_id == GTK_CSS_PROPERTY_FONT_SIZE)
{
if (parent_style)
return _gtk_css_number_value_get (gtk_css_style_get_value (parent_style, GTK_CSS_PROPERTY_FONT_SIZE), 100);
else
return gtk_css_font_size_get_default_px (provider, style);
}
return _gtk_css_number_value_get (gtk_css_style_get_value (style, GTK_CSS_PROPERTY_FONT_SIZE), 100);
}
static double
get_dpi (GtkCssStyle *style)
{
return _gtk_css_number_value_get (gtk_css_style_get_value (style, GTK_CSS_PROPERTY_DPI), 96);
}
static GtkCssValue *
gtk_css_value_dimension_compute (GtkCssValue *number,
guint property_id,
GtkStyleProvider *provider,
GtkCssStyle *style,
GtkCssStyle *parent_style)
{
switch (number->unit)
{
default:
g_assert_not_reached();
G_GNUC_FALLTHROUGH;
case GTK_CSS_PERCENT:
/* percentages for font sizes are computed, other percentages aren't */
if (property_id == GTK_CSS_PROPERTY_FONT_SIZE)
return gtk_css_dimension_value_new (number->value / 100.0 *
get_base_font_size_px (property_id, provider, style, parent_style),
GTK_CSS_PX);
G_GNUC_FALLTHROUGH;
case GTK_CSS_NUMBER:
case GTK_CSS_PX:
case GTK_CSS_DEG:
case GTK_CSS_S:
return _gtk_css_value_ref (number);
case GTK_CSS_PT:
return gtk_css_dimension_value_new (number->value * get_dpi (style) / 72.0,
GTK_CSS_PX);
case GTK_CSS_PC:
return gtk_css_dimension_value_new (number->value * get_dpi (style) / 72.0 * 12.0,
GTK_CSS_PX);
case GTK_CSS_IN:
return gtk_css_dimension_value_new (number->value * get_dpi (style),
GTK_CSS_PX);
case GTK_CSS_CM:
return gtk_css_dimension_value_new (number->value * get_dpi (style) * 0.39370078740157477,
GTK_CSS_PX);
case GTK_CSS_MM:
return gtk_css_dimension_value_new (number->value * get_dpi (style) * 0.039370078740157477,
GTK_CSS_PX);
case GTK_CSS_EM:
return gtk_css_dimension_value_new (number->value *
get_base_font_size_px (property_id, provider, style, parent_style),
GTK_CSS_PX);
case GTK_CSS_EX:
/* for now we pretend ex is half of em */
return gtk_css_dimension_value_new (number->value * 0.5 *
get_base_font_size_px (property_id, provider, style, parent_style),
GTK_CSS_PX);
case GTK_CSS_REM:
return gtk_css_dimension_value_new (number->value *
gtk_css_font_size_get_default_px (provider, style),
GTK_CSS_PX);
case GTK_CSS_RAD:
return gtk_css_dimension_value_new (number->value * 360.0 / (2 * G_PI),
GTK_CSS_DEG);
case GTK_CSS_GRAD:
return gtk_css_dimension_value_new (number->value * 360.0 / 400.0,
GTK_CSS_DEG);
case GTK_CSS_TURN:
return gtk_css_dimension_value_new (number->value * 360.0,
GTK_CSS_DEG);
case GTK_CSS_MS:
return gtk_css_dimension_value_new (number->value / 1000.0,
GTK_CSS_S);
}
}
static gboolean
gtk_css_value_dimension_equal (const GtkCssValue *number1,
const GtkCssValue *number2)
{
return number1->unit == number2->unit &&
number1->value == number2->value;
}
static void
gtk_css_value_dimension_print (const GtkCssValue *number,
GString *string)
{
char buf[G_ASCII_DTOSTR_BUF_SIZE];
const char *names[] = {
/* [GTK_CSS_NUMBER] = */ "",
/* [GTK_CSS_PERCENT] = */ "%",
/* [GTK_CSS_PX] = */ "px",
/* [GTK_CSS_PT] = */ "pt",
/* [GTK_CSS_EM] = */ "em",
/* [GTK_CSS_EX] = */ "ex",
/* [GTK_CSS_REM] = */ "rem",
/* [GTK_CSS_PC] = */ "pc",
/* [GTK_CSS_IN] = */ "in",
/* [GTK_CSS_CM] = */ "cm",
/* [GTK_CSS_MM] = */ "mm",
/* [GTK_CSS_RAD] = */ "rad",
/* [GTK_CSS_DEG] = */ "deg",
/* [GTK_CSS_GRAD] = */ "grad",
/* [GTK_CSS_TURN] = */ "turn",
/* [GTK_CSS_S] = */ "s",
/* [GTK_CSS_MS] = */ "ms",
};
if (isinf (number->value))
g_string_append (string, "infinite");
else
{
g_ascii_dtostr (buf, sizeof (buf), number->value);
g_string_append (string, buf);
if (number->value != 0.0)
g_string_append (string, names[number->unit]);
}
}
static double
gtk_css_value_dimension_get (const GtkCssValue *value,
double one_hundred_percent)
{
if (value->unit == GTK_CSS_PERCENT)
return value->value * one_hundred_percent / 100;
else
return value->value;
}
static GtkCssDimension
gtk_css_value_dimension_get_dimension (const GtkCssValue *value)
{
return gtk_css_unit_get_dimension (value->unit);
}
static gboolean
gtk_css_value_dimension_has_percent (const GtkCssValue *value)
{
return gtk_css_unit_get_dimension (value->unit) == GTK_CSS_DIMENSION_PERCENTAGE;
}
static GtkCssValue *
gtk_css_value_dimension_multiply (const GtkCssValue *value,
double factor)
{
return gtk_css_dimension_value_new (value->value * factor, value->unit);
}
static GtkCssValue *
gtk_css_value_dimension_try_add (GtkCssValue *value1,
GtkCssValue *value2)
{
if (value1->unit != value2->unit)
return NULL;
if (value1->value == 0)
return _gtk_css_value_ref (value2);
if (value2->value == 0)
return _gtk_css_value_ref (value1);
return gtk_css_dimension_value_new (value1->value + value2->value, value1->unit);
}
static gint
gtk_css_value_dimension_get_calc_term_order (const GtkCssValue *value)
{
/* note: the order is alphabetic */
guint order_per_unit[] = {
/* [GTK_CSS_NUMBER] = */ 0,
/* [GTK_CSS_PERCENT] = */ 16,
/* [GTK_CSS_PX] = */ 11,
/* [GTK_CSS_PT] = */ 10,
/* [GTK_CSS_EM] = */ 3,
/* [GTK_CSS_EX] = */ 4,
/* [GTK_CSS_REM] = */ 13,
/* [GTK_CSS_PC] = */ 9,
/* [GTK_CSS_IN] = */ 6,
/* [GTK_CSS_CM] = */ 1,
/* [GTK_CSS_MM] = */ 7,
/* [GTK_CSS_RAD] = */ 12,
/* [GTK_CSS_DEG] = */ 2,
/* [GTK_CSS_GRAD] = */ 5,
/* [GTK_CSS_TURN] = */ 15,
/* [GTK_CSS_S] = */ 14,
/* [GTK_CSS_MS] = */ 8
};
return 1000 + order_per_unit[value->unit];
}
static const GtkCssNumberValueClass GTK_CSS_VALUE_DIMENSION = {
{
"GtkCssDimensionValue",
gtk_css_value_dimension_free,
gtk_css_value_dimension_compute,
gtk_css_value_dimension_equal,
gtk_css_number_value_transition,
NULL,
NULL,
gtk_css_value_dimension_print
},
gtk_css_value_dimension_get,
gtk_css_value_dimension_get_dimension,
gtk_css_value_dimension_has_percent,
gtk_css_value_dimension_multiply,
gtk_css_value_dimension_try_add,
gtk_css_value_dimension_get_calc_term_order
};
GtkCssValue *
gtk_css_dimension_value_new (double value,
GtkCssUnit unit)
{
static GtkCssValue number_singletons[] = {
{ &GTK_CSS_VALUE_DIMENSION.value_class, 1, TRUE, GTK_CSS_NUMBER, 0 },
{ &GTK_CSS_VALUE_DIMENSION.value_class, 1, TRUE, GTK_CSS_NUMBER, 1 },
{ &GTK_CSS_VALUE_DIMENSION.value_class, 1, TRUE, GTK_CSS_NUMBER, 96 }, /* DPI default */
};
static GtkCssValue px_singletons[] = {
{ &GTK_CSS_VALUE_DIMENSION.value_class, 1, TRUE, GTK_CSS_PX, 0 },
{ &GTK_CSS_VALUE_DIMENSION.value_class, 1, TRUE, GTK_CSS_PX, 1 },
{ &GTK_CSS_VALUE_DIMENSION.value_class, 1, TRUE, GTK_CSS_PX, 2 },
{ &GTK_CSS_VALUE_DIMENSION.value_class, 1, TRUE, GTK_CSS_PX, 3 },
{ &GTK_CSS_VALUE_DIMENSION.value_class, 1, TRUE, GTK_CSS_PX, 4 },
{ &GTK_CSS_VALUE_DIMENSION.value_class, 1, TRUE, GTK_CSS_PX, 8 },
{ &GTK_CSS_VALUE_DIMENSION.value_class, 1, TRUE, GTK_CSS_PX, 16 }, /* Icon size default */
{ &GTK_CSS_VALUE_DIMENSION.value_class, 1, TRUE, GTK_CSS_PX, 32 },
{ &GTK_CSS_VALUE_DIMENSION.value_class, 1, TRUE, GTK_CSS_PX, 64 },
};
static GtkCssValue percent_singletons[] = {
{ &GTK_CSS_VALUE_DIMENSION.value_class, 1, FALSE, GTK_CSS_PERCENT, 0 },
{ &GTK_CSS_VALUE_DIMENSION.value_class, 1, FALSE, GTK_CSS_PERCENT, 50 },
{ &GTK_CSS_VALUE_DIMENSION.value_class, 1, FALSE, GTK_CSS_PERCENT, 100 },
};
static GtkCssValue second_singletons[] = {
{ &GTK_CSS_VALUE_DIMENSION.value_class, 1, TRUE, GTK_CSS_S, 0 },
{ &GTK_CSS_VALUE_DIMENSION.value_class, 1, TRUE, GTK_CSS_S, 1 },
};
static GtkCssValue deg_singletons[] = {
{ &GTK_CSS_VALUE_DIMENSION.value_class, 1, TRUE, GTK_CSS_DEG, 0 },
{ &GTK_CSS_VALUE_DIMENSION.value_class, 1, TRUE, GTK_CSS_DEG, 90 },
{ &GTK_CSS_VALUE_DIMENSION.value_class, 1, TRUE, GTK_CSS_DEG, 180 },
{ &GTK_CSS_VALUE_DIMENSION.value_class, 1, TRUE, GTK_CSS_DEG, 270 },
};
GtkCssValue *result;
switch ((guint)unit)
{
case GTK_CSS_NUMBER:
if (value == 0 || value == 1)
return _gtk_css_value_ref (&number_singletons[(int) value]);
if (value == 96)
return _gtk_css_value_ref (&number_singletons[2]);
break;
case GTK_CSS_PX:
if (value == 0 ||
value == 1 ||
value == 2 ||
value == 3 ||
value == 4)
return _gtk_css_value_ref (&px_singletons[(int) value]);
if (value == 8)
return _gtk_css_value_ref (&px_singletons[5]);
if (value == 16)
return _gtk_css_value_ref (&px_singletons[6]);
if (value == 32)
return _gtk_css_value_ref (&px_singletons[7]);
if (value == 64)
return _gtk_css_value_ref (&px_singletons[8]);
break;
case GTK_CSS_PERCENT:
if (value == 0)
return _gtk_css_value_ref (&percent_singletons[0]);
if (value == 50)
return _gtk_css_value_ref (&percent_singletons[1]);
if (value == 100)
return _gtk_css_value_ref (&percent_singletons[2]);
break;
case GTK_CSS_S:
if (value == 0 || value == 1)
return _gtk_css_value_ref (&second_singletons[(int)value]);
break;
case GTK_CSS_DEG:
if (value == 0)
return _gtk_css_value_ref (&deg_singletons[0]);
if (value == 90)
return _gtk_css_value_ref (&deg_singletons[1]);
if (value == 180)
return _gtk_css_value_ref (&deg_singletons[2]);
if (value == 270)
return _gtk_css_value_ref (&deg_singletons[3]);
break;
default:
;
}
result = _gtk_css_value_new (GtkCssValue, &GTK_CSS_VALUE_DIMENSION.value_class);
result->unit = unit;
result->value = value;
return result;
}
GtkCssValue *
gtk_css_dimension_value_parse (GtkCssParser *parser,
GtkCssNumberParseFlags flags)
{
static const struct {
const char *name;
GtkCssUnit unit;
GtkCssNumberParseFlags required_flags;
} units[] = {
{ "px", GTK_CSS_PX, GTK_CSS_PARSE_LENGTH },
{ "pt", GTK_CSS_PT, GTK_CSS_PARSE_LENGTH },
{ "em", GTK_CSS_EM, GTK_CSS_PARSE_LENGTH },
{ "ex", GTK_CSS_EX, GTK_CSS_PARSE_LENGTH },
{ "rem", GTK_CSS_REM, GTK_CSS_PARSE_LENGTH },
{ "pc", GTK_CSS_PC, GTK_CSS_PARSE_LENGTH },
{ "in", GTK_CSS_IN, GTK_CSS_PARSE_LENGTH },
{ "cm", GTK_CSS_CM, GTK_CSS_PARSE_LENGTH },
{ "mm", GTK_CSS_MM, GTK_CSS_PARSE_LENGTH },
{ "rad", GTK_CSS_RAD, GTK_CSS_PARSE_ANGLE },
{ "deg", GTK_CSS_DEG, GTK_CSS_PARSE_ANGLE },
{ "grad", GTK_CSS_GRAD, GTK_CSS_PARSE_ANGLE },
{ "turn", GTK_CSS_TURN, GTK_CSS_PARSE_ANGLE },
{ "s", GTK_CSS_S, GTK_CSS_PARSE_TIME },
{ "ms", GTK_CSS_MS, GTK_CSS_PARSE_TIME }
};
const GtkCssToken *token;
GtkCssValue *result;
GtkCssUnit unit;
double number;
token = gtk_css_parser_get_token (parser);
/* Handle percentages first */
if (gtk_css_token_is (token, GTK_CSS_TOKEN_PERCENTAGE))
{
if (!(flags & GTK_CSS_PARSE_PERCENT))
{
gtk_css_parser_error_value (parser, "Percentages are not allowed here");
return NULL;
}
number = token->number.number;
unit = GTK_CSS_PERCENT;
}
else if (gtk_css_token_is (token, GTK_CSS_TOKEN_SIGNED_INTEGER) ||
gtk_css_token_is (token, GTK_CSS_TOKEN_SIGNLESS_INTEGER) ||
gtk_css_token_is (token, GTK_CSS_TOKEN_SIGNED_NUMBER) ||
gtk_css_token_is (token, GTK_CSS_TOKEN_SIGNLESS_NUMBER))
{
number = token->number.number;
if (number == 0.0)
{
if (flags & GTK_CSS_PARSE_NUMBER)
unit = GTK_CSS_NUMBER;
else if (flags & GTK_CSS_PARSE_LENGTH)
unit = GTK_CSS_PX;
else if (flags & GTK_CSS_PARSE_ANGLE)
unit = GTK_CSS_DEG;
else if (flags & GTK_CSS_PARSE_TIME)
unit = GTK_CSS_S;
else
unit = GTK_CSS_PERCENT;
}
else if (flags & GTK_CSS_PARSE_NUMBER)
{
unit = GTK_CSS_NUMBER;
}
else
{
gtk_css_parser_error_syntax (parser, "Unit is missing.");
return NULL;
}
}
else if (gtk_css_token_is (token, GTK_CSS_TOKEN_SIGNED_INTEGER_DIMENSION) ||
gtk_css_token_is (token, GTK_CSS_TOKEN_SIGNLESS_INTEGER_DIMENSION) ||
gtk_css_token_is (token, GTK_CSS_TOKEN_DIMENSION))
{
guint i;
for (i = 0; i < G_N_ELEMENTS (units); i++)
{
if (flags & units[i].required_flags &&
g_ascii_strcasecmp (token->dimension.dimension, units[i].name) == 0)
break;
}
if (i >= G_N_ELEMENTS (units))
{
gtk_css_parser_error_syntax (parser, "'%s' is not a valid unit.", token->dimension.dimension);
return NULL;
}
unit = units[i].unit;
number = token->dimension.value;
}
else
{
gtk_css_parser_error_syntax (parser, "Expected a number");
return NULL;
}
if (flags & GTK_CSS_POSITIVE_ONLY &&
number < 0)
{
gtk_css_parser_error_value (parser, "negative values are not allowed.");
return NULL;
}
result = gtk_css_dimension_value_new (number, unit);
gtk_css_parser_consume_token (parser);
return result;
}
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