1 /* GTK - The GIMP Toolkit
2 * Copyright (C) 2011 Red Hat, Inc.
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library. If not, see <http://www.gnu.org/licenses/>.
20 #include "gtkcsseasevalueprivate.h"
25 GTK_CSS_EASE_CUBIC_BEZIER,
47 gtk_css_value_ease_free (GtkCssValue *value)
49 g_slice_free (GtkCssValue, value);
53 gtk_css_value_ease_equal (const GtkCssValue *ease1,
54 const GtkCssValue *ease2)
56 if (ease1->type != ease2->type)
61 case GTK_CSS_EASE_CUBIC_BEZIER:
62 return ease1->u.cubic.x1 == ease2->u.cubic.x1 &&
63 ease1->u.cubic.y1 == ease2->u.cubic.y1 &&
64 ease1->u.cubic.x2 == ease2->u.cubic.x2 &&
65 ease1->u.cubic.y2 == ease2->u.cubic.y2;
66 case GTK_CSS_EASE_STEPS:
67 return ease1->u.steps.steps == ease2->u.steps.steps &&
68 ease1->u.steps.start == ease2->u.steps.start;
70 g_assert_not_reached ();
76 gtk_css_value_ease_transition (GtkCssValue *start,
84 gtk_css_value_ease_print (const GtkCssValue *ease,
89 case GTK_CSS_EASE_CUBIC_BEZIER:
90 if (ease->u.cubic.x1 == 0.25 && ease->u.cubic.y1 == 0.1 &&
91 ease->u.cubic.x2 == 0.25 && ease->u.cubic.y2 == 1.0)
92 g_string_append (string, "ease");
93 else if (ease->u.cubic.x1 == 0.0 && ease->u.cubic.y1 == 0.0 &&
94 ease->u.cubic.x2 == 1.0 && ease->u.cubic.y2 == 1.0)
95 g_string_append (string, "linear");
96 else if (ease->u.cubic.x1 == 0.42 && ease->u.cubic.y1 == 0.0 &&
97 ease->u.cubic.x2 == 1.0 && ease->u.cubic.y2 == 1.0)
98 g_string_append (string, "ease-in");
99 else if (ease->u.cubic.x1 == 0.0 && ease->u.cubic.y1 == 0.0 &&
100 ease->u.cubic.x2 == 0.58 && ease->u.cubic.y2 == 1.0)
101 g_string_append (string, "ease-out");
102 else if (ease->u.cubic.x1 == 0.42 && ease->u.cubic.y1 == 0.0 &&
103 ease->u.cubic.x2 == 0.58 && ease->u.cubic.y2 == 1.0)
104 g_string_append (string, "ease-in-out");
106 g_string_append_printf (string, "cubic-bezier(%g,%g,%g,%g)",
107 ease->u.cubic.x1, ease->u.cubic.y1,
108 ease->u.cubic.x2, ease->u.cubic.y2);
110 case GTK_CSS_EASE_STEPS:
111 if (ease->u.steps.steps == 1)
113 g_string_append (string, ease->u.steps.start ? "step-start" : "step-end");
117 g_string_append_printf (string, "steps(%u%s)", ease->u.steps.steps, ease->u.steps.start ? ",start" : "");
121 g_assert_not_reached ();
126 static const GtkCssValueClass GTK_CSS_VALUE_EASE = {
127 gtk_css_value_ease_free,
128 gtk_css_value_ease_equal,
129 gtk_css_value_ease_transition,
130 gtk_css_value_ease_print
134 _gtk_css_ease_value_new_cubic_bezier (double x1,
141 g_return_val_if_fail (x1 >= 0.0, NULL);
142 g_return_val_if_fail (x1 <= 1.0, NULL);
143 g_return_val_if_fail (x2 >= 0.0, NULL);
144 g_return_val_if_fail (x2 <= 1.0, NULL);
146 value = _gtk_css_value_new (GtkCssValue, >K_CSS_VALUE_EASE);
148 value->type = GTK_CSS_EASE_CUBIC_BEZIER;
149 value->u.cubic.x1 = x1;
150 value->u.cubic.y1 = y1;
151 value->u.cubic.x2 = x2;
152 value->u.cubic.y2 = y2;
158 _gtk_css_ease_value_new_steps (guint n_steps,
163 g_return_val_if_fail (n_steps > 0, NULL);
165 value = _gtk_css_value_new (GtkCssValue, >K_CSS_VALUE_EASE);
167 value->type = GTK_CSS_EASE_STEPS;
168 value->u.steps.steps = n_steps;
169 value->u.steps.start = start;
174 static const struct {
177 guint needs_custom :1;
179 } parser_values[] = {
180 { "linear", TRUE, FALSE, { 0.0, 0.0, 1.0, 1.0 } },
181 { "ease-in-out", TRUE, FALSE, { 0.42, 0.0, 0.58, 1.0 } },
182 { "ease-in", TRUE, FALSE, { 0.42, 0.0, 1.0, 1.0 } },
183 { "ease-out", TRUE, FALSE, { 0.0, 0.0, 0.58, 1.0 } },
184 { "ease", TRUE, FALSE, { 0.25, 0.1, 0.25, 1.0 } },
185 { "step-start", FALSE, FALSE, { 1.0, 1.0, 0.0, 0.0 } },
186 { "step-end", FALSE, FALSE, { 1.0, 0.0, 0.0, 0.0 } },
187 { "steps", FALSE, TRUE, { 0.0, 0.0, 0.0, 0.0 } },
188 { "cubic-bezier", TRUE, TRUE, { 0.0, 0.0, 0.0, 0.0 } }
192 _gtk_css_ease_value_can_parse (GtkCssParser *parser)
196 for (i = 0; i < G_N_ELEMENTS (parser_values); i++)
198 if (_gtk_css_parser_has_prefix (parser, parser_values[i].name))
206 gtk_css_ease_value_parse_cubic_bezier (GtkCssParser *parser)
211 for (i = 0; i < 4; i++)
213 if (!_gtk_css_parser_try (parser, i ? "," : "(", TRUE))
215 _gtk_css_parser_error (parser, "Expected '%s'", i ? "," : "(");
218 if (!_gtk_css_parser_try_double (parser, &values[i]))
220 _gtk_css_parser_error (parser, "Expected a number");
223 if ((i == 0 || i == 2) &&
224 (values[i] < 0 || values[i] > 1.0))
226 _gtk_css_parser_error (parser, "value %g out of range. Must be from 0.0 to 1.0", values[i]);
231 if (!_gtk_css_parser_try (parser, ")", TRUE))
233 _gtk_css_parser_error (parser, "Missing closing ')' for cubic-bezier");
237 return _gtk_css_ease_value_new_cubic_bezier (values[0], values[1], values[2], values[3]);
241 gtk_css_ease_value_parse_steps (GtkCssParser *parser)
246 if (!_gtk_css_parser_try (parser, "(", TRUE))
248 _gtk_css_parser_error (parser, "Expected '('");
252 if (!_gtk_css_parser_try_uint (parser, &n_steps))
254 _gtk_css_parser_error (parser, "Expected number of steps");
258 if (_gtk_css_parser_try (parser, ",", TRUE))
260 if (_gtk_css_parser_try (parser, "start", TRUE))
262 else if (_gtk_css_parser_try (parser, "end", TRUE))
266 _gtk_css_parser_error (parser, "Only allowed values are 'start' and 'end'");
273 if (!_gtk_css_parser_try (parser, ")", TRUE))
275 _gtk_css_parser_error (parser, "Missing closing ')' for steps");
279 return _gtk_css_ease_value_new_steps (n_steps, start);
283 _gtk_css_ease_value_parse (GtkCssParser *parser)
287 g_return_val_if_fail (parser != NULL, NULL);
289 for (i = 0; i < G_N_ELEMENTS (parser_values); i++)
291 if (_gtk_css_parser_try (parser, parser_values[i].name, FALSE))
293 if (parser_values[i].needs_custom)
295 if (parser_values[i].is_bezier)
296 return gtk_css_ease_value_parse_cubic_bezier (parser);
298 return gtk_css_ease_value_parse_steps (parser);
301 _gtk_css_parser_skip_whitespace (parser);
303 if (parser_values[i].is_bezier)
304 return _gtk_css_ease_value_new_cubic_bezier (parser_values[i].values[0],
305 parser_values[i].values[1],
306 parser_values[i].values[2],
307 parser_values[i].values[3]);
309 return _gtk_css_ease_value_new_steps (parser_values[i].values[0],
310 parser_values[i].values[1] != 0.0);
314 _gtk_css_parser_error (parser, "Unknown value");
319 _gtk_css_ease_value_transform (const GtkCssValue *ease,
322 g_return_val_if_fail (ease->class == >K_CSS_VALUE_EASE, 1.0);
331 case GTK_CSS_EASE_CUBIC_BEZIER:
333 static const double epsilon = 0.00001;
334 double tmin, t, tmax;
343 sample = (((1.0 + 3 * ease->u.cubic.x1 - 3 * ease->u.cubic.x2) * t
344 + -6 * ease->u.cubic.x1 + 3 * ease->u.cubic.x2) * t
345 + 3 * ease->u.cubic.x1 ) * t;
346 if (fabs(sample - progress) < epsilon)
349 if (progress > sample)
353 t = (tmax + tmin) * .5;
356 return (((1.0 + 3 * ease->u.cubic.y1 - 3 * ease->u.cubic.y2) * t
357 + -6 * ease->u.cubic.y1 + 3 * ease->u.cubic.y2) * t
358 + 3 * ease->u.cubic.y1 ) * t;
360 case GTK_CSS_EASE_STEPS:
361 progress *= ease->u.steps.steps;
362 progress = floor (progress) + ease->u.steps.start ? 0 : 1;
363 return progress / ease->u.steps.steps;
365 g_assert_not_reached ();