1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
|
/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <math.h>
#include <gegl.h>
#include <gtk/gtk.h>
#include "libgimpmath/gimpmath.h"
#include "display-types.h"
#include "gimpdisplay.h"
#include "gimpdisplayshell.h"
#include "gimpdisplayshell-expose.h"
#include "gimpdisplayshell-rotate.h"
#include "gimpdisplayshell-scale.h"
#include "gimpdisplayshell-scroll.h"
#include "gimpdisplayshell-transform.h"
#define ANGLE_EPSILON 1e-3
/* local function prototypes */
static void gimp_display_shell_save_viewport_center (GimpDisplayShell *shell,
gdouble *x,
gdouble *y);
static void gimp_display_shell_restore_viewport_center (GimpDisplayShell *shell,
gdouble x,
gdouble y);
/* public functions */
void
gimp_display_shell_flip (GimpDisplayShell *shell,
gboolean flip_horizontally,
gboolean flip_vertically)
{
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
flip_horizontally = flip_horizontally ? TRUE : FALSE;
flip_vertically = flip_vertically ? TRUE : FALSE;
if (flip_horizontally != shell->flip_horizontally ||
flip_vertically != shell->flip_vertically)
{
gdouble cx, cy;
/* Maintain the current center of the viewport. */
gimp_display_shell_save_viewport_center (shell, &cx, &cy);
/* freeze the active tool */
gimp_display_shell_pause (shell);
/* Adjust the rotation angle so that the image gets reflected across the
* horizontal, and/or vertical, axes in screen space, regardless of the
* current rotation.
*/
if (flip_horizontally == shell->flip_horizontally ||
flip_vertically == shell->flip_vertically)
{
if (shell->rotate_angle != 0.0)
shell->rotate_angle = 360.0 - shell->rotate_angle;
}
shell->flip_horizontally = flip_horizontally;
shell->flip_vertically = flip_vertically;
gimp_display_shell_rotated (shell);
gimp_display_shell_restore_viewport_center (shell, cx, cy);
gimp_display_shell_expose_full (shell);
/* re-enable the active tool */
gimp_display_shell_resume (shell);
}
}
void
gimp_display_shell_rotate (GimpDisplayShell *shell,
gdouble delta)
{
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
gimp_display_shell_rotate_to (shell, shell->rotate_angle + delta);
}
void
gimp_display_shell_rotate_to (GimpDisplayShell *shell,
gdouble value)
{
gdouble cx, cy;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
/* Maintain the current center of the viewport. */
gimp_display_shell_save_viewport_center (shell, &cx, &cy);
/* Make sure the angle is within the range [0, 360). */
value = fmod (value, 360.0);
if (value < 0.0)
value += 360.0;
shell->rotate_angle = value;
/* freeze the active tool */
gimp_display_shell_pause (shell);
gimp_display_shell_scroll_clamp_and_update (shell);
gimp_display_shell_rotated (shell);
gimp_display_shell_restore_viewport_center (shell, cx, cy);
gimp_display_shell_expose_full (shell);
/* re-enable the active tool */
gimp_display_shell_resume (shell);
}
void
gimp_display_shell_rotate_drag (GimpDisplayShell *shell,
gdouble last_x,
gdouble last_y,
gdouble cur_x,
gdouble cur_y,
gboolean constrain)
{
gdouble pivot_x, pivot_y;
gdouble src_x, src_y, src_angle;
gdouble dest_x, dest_y, dest_angle;
gdouble delta_angle;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
/* Rotate the image around the center of the viewport. */
pivot_x = shell->disp_width / 2.0;
pivot_y = shell->disp_height / 2.0;
src_x = last_x - pivot_x;
src_y = last_y - pivot_y;
src_angle = atan2 (src_y, src_x);
dest_x = cur_x - pivot_x;
dest_y = cur_y - pivot_y;
dest_angle = atan2 (dest_y, dest_x);
delta_angle = dest_angle - src_angle;
shell->rotate_drag_angle += 180.0 * delta_angle / G_PI;
gimp_display_shell_rotate_to (shell,
constrain ?
RINT (shell->rotate_drag_angle / 15.0) * 15.0 :
shell->rotate_drag_angle);
}
void
gimp_display_shell_rotate_update_transform (GimpDisplayShell *shell)
{
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
g_clear_pointer (&shell->rotate_transform, g_free);
g_clear_pointer (&shell->rotate_untransform, g_free);
if (fabs (shell->rotate_angle) < ANGLE_EPSILON ||
fabs (360.0 - shell->rotate_angle) < ANGLE_EPSILON)
shell->rotate_angle = 0.0;
if ((shell->rotate_angle != 0.0 ||
shell->flip_horizontally ||
shell->flip_vertically) &&
gimp_display_get_image (shell->display))
{
gint image_width, image_height;
gdouble cx, cy;
shell->rotate_transform = g_new (cairo_matrix_t, 1);
shell->rotate_untransform = g_new (cairo_matrix_t, 1);
gimp_display_shell_scale_get_image_size (shell,
&image_width, &image_height);
cx = -shell->offset_x + image_width / 2;
cy = -shell->offset_y + image_height / 2;
cairo_matrix_init_translate (shell->rotate_transform, cx, cy);
if (shell->rotate_angle != 0.0)
cairo_matrix_rotate (shell->rotate_transform,
shell->rotate_angle / 180.0 * G_PI);
if (shell->flip_horizontally)
cairo_matrix_scale (shell->rotate_transform, -1.0, 1.0);
if (shell->flip_vertically)
cairo_matrix_scale (shell->rotate_transform, 1.0, -1.0);
cairo_matrix_translate (shell->rotate_transform, -cx, -cy);
*shell->rotate_untransform = *shell->rotate_transform;
cairo_matrix_invert (shell->rotate_untransform);
}
}
/* private functions */
static void
gimp_display_shell_save_viewport_center (GimpDisplayShell *shell,
gdouble *x,
gdouble *y)
{
gimp_display_shell_unrotate_xy_f (shell,
shell->disp_width / 2,
shell->disp_height / 2,
x, y);
}
static void
gimp_display_shell_restore_viewport_center (GimpDisplayShell *shell,
gdouble x,
gdouble y)
{
gimp_display_shell_rotate_xy_f (shell, x, y, &x, &y);
x += shell->offset_x - shell->disp_width / 2;
y += shell->offset_y - shell->disp_height / 2;
gimp_display_shell_scroll_set_offset (shell, RINT (x), RINT (y));
}
|
