Adding upstream version 2.10.22.upstream/2.10.22upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 251 insertions, 0 deletions

diff --git a/app/display/gimpdisplayshell-rotate.c b/app/display/gimpdisplayshell-rotate.c
new file mode 100644
index 0000000..d14f2a5
--- /dev/null
+++ b/app/display/gimpdisplayshell-rotate.c
@@ -0,0 +1,251 @@
+/* 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));
+}