forked from AuroraMiddleware/gtk
407 lines
11 KiB
C
407 lines
11 KiB
C
/* GTK - The GIMP Toolkit
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* Copyright (C) 2011 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "gtkcsseasevalueprivate.h"
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#include <math.h>
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typedef enum {
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GTK_CSS_EASE_CUBIC_BEZIER,
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GTK_CSS_EASE_STEPS
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} GtkCssEaseType;
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struct _GtkCssValue {
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GTK_CSS_VALUE_BASE
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GtkCssEaseType type;
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union {
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struct {
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double x1;
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double y1;
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double x2;
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double y2;
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} cubic;
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struct {
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guint steps;
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gboolean start;
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} steps;
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} u;
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};
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static void
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gtk_css_value_ease_free (GtkCssValue *value)
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{
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g_slice_free (GtkCssValue, value);
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}
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static GtkCssValue *
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gtk_css_value_ease_compute (GtkCssValue *value,
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guint property_id,
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GtkStyleProvider *provider,
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GtkCssStyle *style,
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GtkCssStyle *parent_style)
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{
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return _gtk_css_value_ref (value);
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}
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static gboolean
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gtk_css_value_ease_equal (const GtkCssValue *ease1,
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const GtkCssValue *ease2)
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{
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if (ease1->type != ease2->type)
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return FALSE;
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switch (ease1->type)
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{
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case GTK_CSS_EASE_CUBIC_BEZIER:
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return ease1->u.cubic.x1 == ease2->u.cubic.x1 &&
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ease1->u.cubic.y1 == ease2->u.cubic.y1 &&
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ease1->u.cubic.x2 == ease2->u.cubic.x2 &&
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ease1->u.cubic.y2 == ease2->u.cubic.y2;
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case GTK_CSS_EASE_STEPS:
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return ease1->u.steps.steps == ease2->u.steps.steps &&
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ease1->u.steps.start == ease2->u.steps.start;
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default:
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g_assert_not_reached ();
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return FALSE;
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}
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}
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static GtkCssValue *
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gtk_css_value_ease_transition (GtkCssValue *start,
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GtkCssValue *end,
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guint property_id,
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double progress)
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{
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return NULL;
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}
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static void
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gtk_css_value_ease_print (const GtkCssValue *ease,
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GString *string)
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{
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switch (ease->type)
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{
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case GTK_CSS_EASE_CUBIC_BEZIER:
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if (ease->u.cubic.x1 == 0.25 && ease->u.cubic.y1 == 0.1 &&
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ease->u.cubic.x2 == 0.25 && ease->u.cubic.y2 == 1.0)
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g_string_append (string, "ease");
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else if (ease->u.cubic.x1 == 0.0 && ease->u.cubic.y1 == 0.0 &&
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ease->u.cubic.x2 == 1.0 && ease->u.cubic.y2 == 1.0)
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g_string_append (string, "linear");
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else if (ease->u.cubic.x1 == 0.42 && ease->u.cubic.y1 == 0.0 &&
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ease->u.cubic.x2 == 1.0 && ease->u.cubic.y2 == 1.0)
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g_string_append (string, "ease-in");
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else if (ease->u.cubic.x1 == 0.0 && ease->u.cubic.y1 == 0.0 &&
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ease->u.cubic.x2 == 0.58 && ease->u.cubic.y2 == 1.0)
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g_string_append (string, "ease-out");
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else if (ease->u.cubic.x1 == 0.42 && ease->u.cubic.y1 == 0.0 &&
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ease->u.cubic.x2 == 0.58 && ease->u.cubic.y2 == 1.0)
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g_string_append (string, "ease-in-out");
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else
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g_string_append_printf (string, "cubic-bezier(%g,%g,%g,%g)",
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ease->u.cubic.x1, ease->u.cubic.y1,
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ease->u.cubic.x2, ease->u.cubic.y2);
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break;
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case GTK_CSS_EASE_STEPS:
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if (ease->u.steps.steps == 1)
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{
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g_string_append (string, ease->u.steps.start ? "step-start" : "step-end");
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}
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else
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{
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g_string_append_printf (string, "steps(%u%s)", ease->u.steps.steps, ease->u.steps.start ? ",start" : "");
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}
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break;
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default:
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g_assert_not_reached ();
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break;
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}
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}
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static const GtkCssValueClass GTK_CSS_VALUE_EASE = {
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gtk_css_value_ease_free,
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gtk_css_value_ease_compute,
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gtk_css_value_ease_equal,
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gtk_css_value_ease_transition,
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NULL,
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NULL,
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gtk_css_value_ease_print
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};
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GtkCssValue *
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_gtk_css_ease_value_new_cubic_bezier (double x1,
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double y1,
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double x2,
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double y2)
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{
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GtkCssValue *value;
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g_return_val_if_fail (x1 >= 0.0, NULL);
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g_return_val_if_fail (x1 <= 1.0, NULL);
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g_return_val_if_fail (x2 >= 0.0, NULL);
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g_return_val_if_fail (x2 <= 1.0, NULL);
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value = _gtk_css_value_new (GtkCssValue, >K_CSS_VALUE_EASE);
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value->type = GTK_CSS_EASE_CUBIC_BEZIER;
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value->u.cubic.x1 = x1;
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value->u.cubic.y1 = y1;
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value->u.cubic.x2 = x2;
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value->u.cubic.y2 = y2;
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return value;
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}
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static GtkCssValue *
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_gtk_css_ease_value_new_steps (guint n_steps,
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gboolean start)
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{
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GtkCssValue *value;
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g_return_val_if_fail (n_steps > 0, NULL);
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value = _gtk_css_value_new (GtkCssValue, >K_CSS_VALUE_EASE);
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value->type = GTK_CSS_EASE_STEPS;
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value->u.steps.steps = n_steps;
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value->u.steps.start = start;
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return value;
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}
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static const struct {
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const char *name;
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guint is_bezier :1;
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guint is_function :1;
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double values[4];
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} parser_values[] = {
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{ "linear", TRUE, FALSE, { 0.0, 0.0, 1.0, 1.0 } },
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{ "ease-in-out", TRUE, FALSE, { 0.42, 0.0, 0.58, 1.0 } },
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{ "ease-in", TRUE, FALSE, { 0.42, 0.0, 1.0, 1.0 } },
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{ "ease-out", TRUE, FALSE, { 0.0, 0.0, 0.58, 1.0 } },
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{ "ease", TRUE, FALSE, { 0.25, 0.1, 0.25, 1.0 } },
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{ "step-start", FALSE, FALSE, { 1.0, 1.0, 0.0, 0.0 } },
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{ "step-end", FALSE, FALSE, { 1.0, 0.0, 0.0, 0.0 } },
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{ "steps", FALSE, TRUE, { 0.0, 0.0, 0.0, 0.0 } },
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{ "cubic-bezier", TRUE, TRUE, { 0.0, 0.0, 0.0, 0.0 } }
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};
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gboolean
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_gtk_css_ease_value_can_parse (GtkCssParser *parser)
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{
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guint i;
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for (i = 0; i < G_N_ELEMENTS (parser_values); i++)
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{
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if (parser_values[i].is_function)
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{
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if (gtk_css_parser_has_function (parser, parser_values[i].name))
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return TRUE;
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}
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else
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{
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if (gtk_css_parser_has_ident (parser, parser_values[i].name))
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return TRUE;
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}
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}
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return FALSE;
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}
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static guint
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gtk_css_ease_value_parse_cubic_bezier_arg (GtkCssParser *parser,
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guint arg,
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gpointer data)
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{
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double *values = data;
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if (!gtk_css_parser_consume_number (parser, &values[arg]))
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return 0;
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if (arg % 2 == 0)
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{
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if (values[arg] < 0 || values[arg] > 1.0)
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{
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gtk_css_parser_error_value (parser, "value %g out of range. Must be from 0.0 to 1.0", values[arg]);
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return 0;
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}
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}
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return 1;
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}
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static GtkCssValue *
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gtk_css_ease_value_parse_cubic_bezier (GtkCssParser *parser)
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{
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double values[4];
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if (!gtk_css_parser_consume_function (parser, 4, 4, gtk_css_ease_value_parse_cubic_bezier_arg, values))
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return NULL;
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return _gtk_css_ease_value_new_cubic_bezier (values[0], values[1], values[2], values[3]);
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}
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typedef struct
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{
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int n_steps;
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gboolean start;
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} ParseStepsData;
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static guint
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gtk_css_ease_value_parse_steps_arg (GtkCssParser *parser,
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guint arg,
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gpointer data_)
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{
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ParseStepsData *data = data_;
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switch (arg)
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{
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case 0:
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if (!gtk_css_parser_consume_integer (parser, &data->n_steps))
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{
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return 0;
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}
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else if (data->n_steps < 1)
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{
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gtk_css_parser_error_value (parser, "Number of steps must be > 0");
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return 0;
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}
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return 1;
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case 1:
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if (gtk_css_parser_try_ident (parser, "start"))
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data->start = TRUE;
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else if (gtk_css_parser_try_ident (parser, "end"))
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data->start = FALSE;
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else
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{
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gtk_css_parser_error_syntax (parser, "Only allowed values are 'start' and 'end'");
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return 0;
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}
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return 1;
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default:
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g_return_val_if_reached (0);
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}
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}
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static GtkCssValue *
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gtk_css_ease_value_parse_steps (GtkCssParser *parser)
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{
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ParseStepsData data = { 0, FALSE };
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if (!gtk_css_parser_consume_function (parser, 1, 2, gtk_css_ease_value_parse_steps_arg, &data))
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return NULL;
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return _gtk_css_ease_value_new_steps (data.n_steps, data.start);
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}
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GtkCssValue *
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_gtk_css_ease_value_parse (GtkCssParser *parser)
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{
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guint i;
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g_return_val_if_fail (parser != NULL, NULL);
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for (i = 0; i < G_N_ELEMENTS (parser_values); i++)
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{
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if (parser_values[i].is_function)
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{
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if (gtk_css_parser_has_function (parser, parser_values[i].name))
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{
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if (parser_values[i].is_bezier)
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return gtk_css_ease_value_parse_cubic_bezier (parser);
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else
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return gtk_css_ease_value_parse_steps (parser);
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}
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}
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else
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{
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if (gtk_css_parser_try_ident (parser, parser_values[i].name))
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{
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if (parser_values[i].is_bezier)
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return _gtk_css_ease_value_new_cubic_bezier (parser_values[i].values[0],
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parser_values[i].values[1],
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parser_values[i].values[2],
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parser_values[i].values[3]);
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else
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return _gtk_css_ease_value_new_steps (parser_values[i].values[0],
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parser_values[i].values[1] != 0.0);
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}
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}
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}
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gtk_css_parser_error_syntax (parser, "Expected a valid ease value");
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return NULL;
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}
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double
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_gtk_css_ease_value_transform (const GtkCssValue *ease,
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double progress)
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{
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g_return_val_if_fail (ease->class == >K_CSS_VALUE_EASE, 1.0);
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if (progress <= 0)
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return 0;
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if (progress >= 1)
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return 1;
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switch (ease->type)
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{
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case GTK_CSS_EASE_CUBIC_BEZIER:
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{
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static const double epsilon = 0.00001;
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double tmin, t, tmax;
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tmin = 0.0;
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tmax = 1.0;
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t = progress;
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while (tmin < tmax)
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{
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double sample;
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sample = (((1.0 + 3 * ease->u.cubic.x1 - 3 * ease->u.cubic.x2) * t
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+ -6 * ease->u.cubic.x1 + 3 * ease->u.cubic.x2) * t
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+ 3 * ease->u.cubic.x1 ) * t;
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if (fabs(sample - progress) < epsilon)
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break;
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if (progress > sample)
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tmin = t;
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else
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tmax = t;
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t = (tmax + tmin) * .5;
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}
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return (((1.0 + 3 * ease->u.cubic.y1 - 3 * ease->u.cubic.y2) * t
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+ -6 * ease->u.cubic.y1 + 3 * ease->u.cubic.y2) * t
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+ 3 * ease->u.cubic.y1 ) * t;
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}
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case GTK_CSS_EASE_STEPS:
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progress *= ease->u.steps.steps;
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progress = floor (progress) + (ease->u.steps.start ? 0 : 1);
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return progress / ease->u.steps.steps;
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default:
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g_assert_not_reached ();
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return 1.0;
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}
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}
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