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,
55 GtkStyleContext *context,
56 GtkCssDependencies *dependencies)
58 return _gtk_css_value_ref (value);
62 gtk_css_value_ease_equal (const GtkCssValue *ease1,
63 const GtkCssValue *ease2)
65 if (ease1->type != ease2->type)
70 case GTK_CSS_EASE_CUBIC_BEZIER:
71 return ease1->u.cubic.x1 == ease2->u.cubic.x1 &&
72 ease1->u.cubic.y1 == ease2->u.cubic.y1 &&
73 ease1->u.cubic.x2 == ease2->u.cubic.x2 &&
74 ease1->u.cubic.y2 == ease2->u.cubic.y2;
75 case GTK_CSS_EASE_STEPS:
76 return ease1->u.steps.steps == ease2->u.steps.steps &&
77 ease1->u.steps.start == ease2->u.steps.start;
79 g_assert_not_reached ();
85 gtk_css_value_ease_transition (GtkCssValue *start,
93 gtk_css_value_ease_print (const GtkCssValue *ease,
98 case GTK_CSS_EASE_CUBIC_BEZIER:
99 if (ease->u.cubic.x1 == 0.25 && ease->u.cubic.y1 == 0.1 &&
100 ease->u.cubic.x2 == 0.25 && ease->u.cubic.y2 == 1.0)
101 g_string_append (string, "ease");
102 else if (ease->u.cubic.x1 == 0.0 && ease->u.cubic.y1 == 0.0 &&
103 ease->u.cubic.x2 == 1.0 && ease->u.cubic.y2 == 1.0)
104 g_string_append (string, "linear");
105 else if (ease->u.cubic.x1 == 0.42 && ease->u.cubic.y1 == 0.0 &&
106 ease->u.cubic.x2 == 1.0 && ease->u.cubic.y2 == 1.0)
107 g_string_append (string, "ease-in");
108 else if (ease->u.cubic.x1 == 0.0 && ease->u.cubic.y1 == 0.0 &&
109 ease->u.cubic.x2 == 0.58 && ease->u.cubic.y2 == 1.0)
110 g_string_append (string, "ease-out");
111 else if (ease->u.cubic.x1 == 0.42 && ease->u.cubic.y1 == 0.0 &&
112 ease->u.cubic.x2 == 0.58 && ease->u.cubic.y2 == 1.0)
113 g_string_append (string, "ease-in-out");
115 g_string_append_printf (string, "cubic-bezier(%g,%g,%g,%g)",
116 ease->u.cubic.x1, ease->u.cubic.y1,
117 ease->u.cubic.x2, ease->u.cubic.y2);
119 case GTK_CSS_EASE_STEPS:
120 if (ease->u.steps.steps == 1)
122 g_string_append (string, ease->u.steps.start ? "step-start" : "step-end");
126 g_string_append_printf (string, "steps(%u%s)", ease->u.steps.steps, ease->u.steps.start ? ",start" : "");
130 g_assert_not_reached ();
135 static const GtkCssValueClass GTK_CSS_VALUE_EASE = {
136 gtk_css_value_ease_free,
137 gtk_css_value_ease_compute,
138 gtk_css_value_ease_equal,
139 gtk_css_value_ease_transition,
140 gtk_css_value_ease_print
144 _gtk_css_ease_value_new_cubic_bezier (double x1,
151 g_return_val_if_fail (x1 >= 0.0, NULL);
152 g_return_val_if_fail (x1 <= 1.0, NULL);
153 g_return_val_if_fail (x2 >= 0.0, NULL);
154 g_return_val_if_fail (x2 <= 1.0, NULL);
156 value = _gtk_css_value_new (GtkCssValue, >K_CSS_VALUE_EASE);
158 value->type = GTK_CSS_EASE_CUBIC_BEZIER;
159 value->u.cubic.x1 = x1;
160 value->u.cubic.y1 = y1;
161 value->u.cubic.x2 = x2;
162 value->u.cubic.y2 = y2;
168 _gtk_css_ease_value_new_steps (guint n_steps,
173 g_return_val_if_fail (n_steps > 0, NULL);
175 value = _gtk_css_value_new (GtkCssValue, >K_CSS_VALUE_EASE);
177 value->type = GTK_CSS_EASE_STEPS;
178 value->u.steps.steps = n_steps;
179 value->u.steps.start = start;
184 static const struct {
187 guint needs_custom :1;
189 } parser_values[] = {
190 { "linear", TRUE, FALSE, { 0.0, 0.0, 1.0, 1.0 } },
191 { "ease-in-out", TRUE, FALSE, { 0.42, 0.0, 0.58, 1.0 } },
192 { "ease-in", TRUE, FALSE, { 0.42, 0.0, 1.0, 1.0 } },
193 { "ease-out", TRUE, FALSE, { 0.0, 0.0, 0.58, 1.0 } },
194 { "ease", TRUE, FALSE, { 0.25, 0.1, 0.25, 1.0 } },
195 { "step-start", FALSE, FALSE, { 1.0, 1.0, 0.0, 0.0 } },
196 { "step-end", FALSE, FALSE, { 1.0, 0.0, 0.0, 0.0 } },
197 { "steps", FALSE, TRUE, { 0.0, 0.0, 0.0, 0.0 } },
198 { "cubic-bezier", TRUE, TRUE, { 0.0, 0.0, 0.0, 0.0 } }
202 _gtk_css_ease_value_can_parse (GtkCssParser *parser)
206 for (i = 0; i < G_N_ELEMENTS (parser_values); i++)
208 if (_gtk_css_parser_has_prefix (parser, parser_values[i].name))
216 gtk_css_ease_value_parse_cubic_bezier (GtkCssParser *parser)
221 for (i = 0; i < 4; i++)
223 if (!_gtk_css_parser_try (parser, i ? "," : "(", TRUE))
225 _gtk_css_parser_error (parser, "Expected '%s'", i ? "," : "(");
228 if (!_gtk_css_parser_try_double (parser, &values[i]))
230 _gtk_css_parser_error (parser, "Expected a number");
233 if ((i == 0 || i == 2) &&
234 (values[i] < 0 || values[i] > 1.0))
236 _gtk_css_parser_error (parser, "value %g out of range. Must be from 0.0 to 1.0", values[i]);
241 if (!_gtk_css_parser_try (parser, ")", TRUE))
243 _gtk_css_parser_error (parser, "Missing closing ')' for cubic-bezier");
247 return _gtk_css_ease_value_new_cubic_bezier (values[0], values[1], values[2], values[3]);
251 gtk_css_ease_value_parse_steps (GtkCssParser *parser)
256 if (!_gtk_css_parser_try (parser, "(", TRUE))
258 _gtk_css_parser_error (parser, "Expected '('");
262 if (!_gtk_css_parser_try_uint (parser, &n_steps))
264 _gtk_css_parser_error (parser, "Expected number of steps");
268 if (_gtk_css_parser_try (parser, ",", TRUE))
270 if (_gtk_css_parser_try (parser, "start", TRUE))
272 else if (_gtk_css_parser_try (parser, "end", TRUE))
276 _gtk_css_parser_error (parser, "Only allowed values are 'start' and 'end'");
283 if (!_gtk_css_parser_try (parser, ")", TRUE))
285 _gtk_css_parser_error (parser, "Missing closing ')' for steps");
289 return _gtk_css_ease_value_new_steps (n_steps, start);
293 _gtk_css_ease_value_parse (GtkCssParser *parser)
297 g_return_val_if_fail (parser != NULL, NULL);
299 for (i = 0; i < G_N_ELEMENTS (parser_values); i++)
301 if (_gtk_css_parser_try (parser, parser_values[i].name, FALSE))
303 if (parser_values[i].needs_custom)
305 if (parser_values[i].is_bezier)
306 return gtk_css_ease_value_parse_cubic_bezier (parser);
308 return gtk_css_ease_value_parse_steps (parser);
311 _gtk_css_parser_skip_whitespace (parser);
313 if (parser_values[i].is_bezier)
314 return _gtk_css_ease_value_new_cubic_bezier (parser_values[i].values[0],
315 parser_values[i].values[1],
316 parser_values[i].values[2],
317 parser_values[i].values[3]);
319 return _gtk_css_ease_value_new_steps (parser_values[i].values[0],
320 parser_values[i].values[1] != 0.0);
324 _gtk_css_parser_error (parser, "Unknown value");
329 _gtk_css_ease_value_transform (const GtkCssValue *ease,
332 g_return_val_if_fail (ease->class == >K_CSS_VALUE_EASE, 1.0);
341 case GTK_CSS_EASE_CUBIC_BEZIER:
343 static const double epsilon = 0.00001;
344 double tmin, t, tmax;
353 sample = (((1.0 + 3 * ease->u.cubic.x1 - 3 * ease->u.cubic.x2) * t
354 + -6 * ease->u.cubic.x1 + 3 * ease->u.cubic.x2) * t
355 + 3 * ease->u.cubic.x1 ) * t;
356 if (fabs(sample - progress) < epsilon)
359 if (progress > sample)
363 t = (tmax + tmin) * .5;
366 return (((1.0 + 3 * ease->u.cubic.y1 - 3 * ease->u.cubic.y2) * t
367 + -6 * ease->u.cubic.y1 + 3 * ease->u.cubic.y2) * t
368 + 3 * ease->u.cubic.y1 ) * t;
370 case GTK_CSS_EASE_STEPS:
371 progress *= ease->u.steps.steps;
372 progress = floor (progress) + ease->u.steps.start ? 0 : 1;
373 return progress / ease->u.steps.steps;
375 g_assert_not_reached ();