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gtk2/gtk/gtkcssdimensionvalue.c
Matthias Clasen a7cad79092 css: Allow transitioning between different units again 
This turns out to be necessary for transitioning filters,
and we run into criticals if transitioning numbers
unexpectedly returns NULL. I've observed that with

* {
  filter: invert(80%);
}

This was broken in c9e972eecb.
2020-04-18 21:10:32 -04:00

510 lines
16 KiB
C
Raw Blame History

/* 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 (parent_style->core->font_size, 100);
else
return gtk_css_font_size_get_default_px (provider, style);
}
return _gtk_css_number_value_get (style->core->font_size, 100);
}
static double
get_dpi (GtkCssStyle *style)
{
return _gtk_css_number_value_get (style->core->dpi, 96);
}
static GtkCssValue *
gtk_css_value_dimension_compute (GtkCssValue *number,
guint property_id,
GtkStyleProvider *provider,
GtkCssStyle *style,
GtkCssStyle *parent_style)
{
switch (number->unit)
{
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);
default:
g_assert_not_reached();
}
}
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 (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 GtkCssValue *
gtk_css_value_dimension_transition (GtkCssValue *start,
GtkCssValue *end,
guint property_id,
double progress)
{
if (start->unit == end->unit)
return gtk_css_dimension_value_new (start->value + (end->value - start->value) * progress, start->unit);
return gtk_css_number_value_transition (start, end, property_id, progress);
}
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_value_dimension_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, TRUE, 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;
result->is_computed = value == 0 ||
unit == GTK_CSS_NUMBER ||
unit == GTK_CSS_PX ||
unit == GTK_CSS_DEG ||
unit == GTK_CSS_S;
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;
}
gboolean
gtk_css_dimension_value_is_zero (const GtkCssValue *value)
{
if (!value)
return TRUE;
if (value->class != &GTK_CSS_VALUE_DIMENSION.value_class)
return FALSE;
return value->value == 0;
}
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