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_compute (GtkCssValue *value,
54 GtkStyleContext *context)
56 return _gtk_css_value_ref (value);
60 gtk_css_value_ease_equal (const GtkCssValue *ease1,
61 const GtkCssValue *ease2)
63 if (ease1->type != ease2->type)
68 case GTK_CSS_EASE_CUBIC_BEZIER:
69 return ease1->u.cubic.x1 == ease2->u.cubic.x1 &&
70 ease1->u.cubic.y1 == ease2->u.cubic.y1 &&
71 ease1->u.cubic.x2 == ease2->u.cubic.x2 &&
72 ease1->u.cubic.y2 == ease2->u.cubic.y2;
73 case GTK_CSS_EASE_STEPS:
74 return ease1->u.steps.steps == ease2->u.steps.steps &&
75 ease1->u.steps.start == ease2->u.steps.start;
77 g_assert_not_reached ();
83 gtk_css_value_ease_transition (GtkCssValue *start,
91 gtk_css_value_ease_print (const GtkCssValue *ease,
96 case GTK_CSS_EASE_CUBIC_BEZIER:
97 if (ease->u.cubic.x1 == 0.25 && ease->u.cubic.y1 == 0.1 &&
98 ease->u.cubic.x2 == 0.25 && ease->u.cubic.y2 == 1.0)
99 g_string_append (string, "ease");
100 else if (ease->u.cubic.x1 == 0.0 && ease->u.cubic.y1 == 0.0 &&
101 ease->u.cubic.x2 == 1.0 && ease->u.cubic.y2 == 1.0)
102 g_string_append (string, "linear");
103 else if (ease->u.cubic.x1 == 0.42 && ease->u.cubic.y1 == 0.0 &&
104 ease->u.cubic.x2 == 1.0 && ease->u.cubic.y2 == 1.0)
105 g_string_append (string, "ease-in");
106 else if (ease->u.cubic.x1 == 0.0 && ease->u.cubic.y1 == 0.0 &&
107 ease->u.cubic.x2 == 0.58 && ease->u.cubic.y2 == 1.0)
108 g_string_append (string, "ease-out");
109 else if (ease->u.cubic.x1 == 0.42 && ease->u.cubic.y1 == 0.0 &&
110 ease->u.cubic.x2 == 0.58 && ease->u.cubic.y2 == 1.0)
111 g_string_append (string, "ease-in-out");
113 g_string_append_printf (string, "cubic-bezier(%g,%g,%g,%g)",
114 ease->u.cubic.x1, ease->u.cubic.y1,
115 ease->u.cubic.x2, ease->u.cubic.y2);
117 case GTK_CSS_EASE_STEPS:
118 if (ease->u.steps.steps == 1)
120 g_string_append (string, ease->u.steps.start ? "step-start" : "step-end");
124 g_string_append_printf (string, "steps(%u%s)", ease->u.steps.steps, ease->u.steps.start ? ",start" : "");
128 g_assert_not_reached ();
133 static const GtkCssValueClass GTK_CSS_VALUE_EASE = {
134 gtk_css_value_ease_free,
135 gtk_css_value_ease_compute,
136 gtk_css_value_ease_equal,
137 gtk_css_value_ease_transition,
138 gtk_css_value_ease_print
142 _gtk_css_ease_value_new_cubic_bezier (double x1,
149 g_return_val_if_fail (x1 >= 0.0, NULL);
150 g_return_val_if_fail (x1 <= 1.0, NULL);
151 g_return_val_if_fail (x2 >= 0.0, NULL);
152 g_return_val_if_fail (x2 <= 1.0, NULL);
154 value = _gtk_css_value_new (GtkCssValue, >K_CSS_VALUE_EASE);
156 value->type = GTK_CSS_EASE_CUBIC_BEZIER;
157 value->u.cubic.x1 = x1;
158 value->u.cubic.y1 = y1;
159 value->u.cubic.x2 = x2;
160 value->u.cubic.y2 = y2;
166 _gtk_css_ease_value_new_steps (guint n_steps,
171 g_return_val_if_fail (n_steps > 0, NULL);
173 value = _gtk_css_value_new (GtkCssValue, >K_CSS_VALUE_EASE);
175 value->type = GTK_CSS_EASE_STEPS;
176 value->u.steps.steps = n_steps;
177 value->u.steps.start = start;
182 static const struct {
185 guint needs_custom :1;
187 } parser_values[] = {
188 { "linear", TRUE, FALSE, { 0.0, 0.0, 1.0, 1.0 } },
189 { "ease-in-out", TRUE, FALSE, { 0.42, 0.0, 0.58, 1.0 } },
190 { "ease-in", TRUE, FALSE, { 0.42, 0.0, 1.0, 1.0 } },
191 { "ease-out", TRUE, FALSE, { 0.0, 0.0, 0.58, 1.0 } },
192 { "ease", TRUE, FALSE, { 0.25, 0.1, 0.25, 1.0 } },
193 { "step-start", FALSE, FALSE, { 1.0, 1.0, 0.0, 0.0 } },
194 { "step-end", FALSE, FALSE, { 1.0, 0.0, 0.0, 0.0 } },
195 { "steps", FALSE, TRUE, { 0.0, 0.0, 0.0, 0.0 } },
196 { "cubic-bezier", TRUE, TRUE, { 0.0, 0.0, 0.0, 0.0 } }
200 _gtk_css_ease_value_can_parse (GtkCssParser *parser)
204 for (i = 0; i < G_N_ELEMENTS (parser_values); i++)
206 if (_gtk_css_parser_has_prefix (parser, parser_values[i].name))
214 gtk_css_ease_value_parse_cubic_bezier (GtkCssParser *parser)
219 for (i = 0; i < 4; i++)
221 if (!_gtk_css_parser_try (parser, i ? "," : "(", TRUE))
223 _gtk_css_parser_error (parser, "Expected '%s'", i ? "," : "(");
226 if (!_gtk_css_parser_try_double (parser, &values[i]))
228 _gtk_css_parser_error (parser, "Expected a number");
231 if ((i == 0 || i == 2) &&
232 (values[i] < 0 || values[i] > 1.0))
234 _gtk_css_parser_error (parser, "value %g out of range. Must be from 0.0 to 1.0", values[i]);
239 if (!_gtk_css_parser_try (parser, ")", TRUE))
241 _gtk_css_parser_error (parser, "Missing closing ')' for cubic-bezier");
245 return _gtk_css_ease_value_new_cubic_bezier (values[0], values[1], values[2], values[3]);
249 gtk_css_ease_value_parse_steps (GtkCssParser *parser)
254 if (!_gtk_css_parser_try (parser, "(", TRUE))
256 _gtk_css_parser_error (parser, "Expected '('");
260 if (!_gtk_css_parser_try_uint (parser, &n_steps))
262 _gtk_css_parser_error (parser, "Expected number of steps");
266 if (_gtk_css_parser_try (parser, ",", TRUE))
268 if (_gtk_css_parser_try (parser, "start", TRUE))
270 else if (_gtk_css_parser_try (parser, "end", TRUE))
274 _gtk_css_parser_error (parser, "Only allowed values are 'start' and 'end'");
281 if (!_gtk_css_parser_try (parser, ")", TRUE))
283 _gtk_css_parser_error (parser, "Missing closing ')' for steps");
287 return _gtk_css_ease_value_new_steps (n_steps, start);
291 _gtk_css_ease_value_parse (GtkCssParser *parser)
295 g_return_val_if_fail (parser != NULL, NULL);
297 for (i = 0; i < G_N_ELEMENTS (parser_values); i++)
299 if (_gtk_css_parser_try (parser, parser_values[i].name, FALSE))
301 if (parser_values[i].needs_custom)
303 if (parser_values[i].is_bezier)
304 return gtk_css_ease_value_parse_cubic_bezier (parser);
306 return gtk_css_ease_value_parse_steps (parser);
309 _gtk_css_parser_skip_whitespace (parser);
311 if (parser_values[i].is_bezier)
312 return _gtk_css_ease_value_new_cubic_bezier (parser_values[i].values[0],
313 parser_values[i].values[1],
314 parser_values[i].values[2],
315 parser_values[i].values[3]);
317 return _gtk_css_ease_value_new_steps (parser_values[i].values[0],
318 parser_values[i].values[1] != 0.0);
322 _gtk_css_parser_error (parser, "Unknown value");
327 _gtk_css_ease_value_transform (const GtkCssValue *ease,
330 g_return_val_if_fail (ease->class == >K_CSS_VALUE_EASE, 1.0);
339 case GTK_CSS_EASE_CUBIC_BEZIER:
341 static const double epsilon = 0.00001;
342 double tmin, t, tmax;
351 sample = (((1.0 + 3 * ease->u.cubic.x1 - 3 * ease->u.cubic.x2) * t
352 + -6 * ease->u.cubic.x1 + 3 * ease->u.cubic.x2) * t
353 + 3 * ease->u.cubic.x1 ) * t;
354 if (fabs(sample - progress) < epsilon)
357 if (progress > sample)
361 t = (tmax + tmin) * .5;
364 return (((1.0 + 3 * ease->u.cubic.y1 - 3 * ease->u.cubic.y2) * t
365 + -6 * ease->u.cubic.y1 + 3 * ease->u.cubic.y2) * t
366 + 3 * ease->u.cubic.y1 ) * t;
368 case GTK_CSS_EASE_STEPS:
369 progress *= ease->u.steps.steps;
370 progress = floor (progress) + ease->u.steps.start ? 0 : 1;
371 return progress / ease->u.steps.steps;
373 g_assert_not_reached ();