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+/* 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/>.
+ */
+
+#ifndef __GIMP_DISPLAY_SHELL_TRANSFORM_H__
+#define __GIMP_DISPLAY_SHELL_TRANSFORM_H__
+
+
+/* zoom: functions to transform from image space to unrotated display
+ * space and back, taking into account scroll offset and scale
+ */
+
+void gimp_display_shell_zoom_coords (GimpDisplayShell *shell,
+ const GimpCoords *image_coords,
+ GimpCoords *display_coords);
+void gimp_display_shell_unzoom_coords (GimpDisplayShell *shell,
+ const GimpCoords *display_coords,
+ GimpCoords *image_coords);
+
+void gimp_display_shell_zoom_xy (GimpDisplayShell *shell,
+ gdouble x,
+ gdouble y,
+ gint *nx,
+ gint *ny);
+void gimp_display_shell_unzoom_xy (GimpDisplayShell *shell,
+ gint x,
+ gint y,
+ gint *nx,
+ gint *ny,
+ gboolean round);
+
+void gimp_display_shell_zoom_xy_f (GimpDisplayShell *shell,
+ gdouble x,
+ gdouble y,
+ gdouble *nx,
+ gdouble *ny);
+void gimp_display_shell_unzoom_xy_f (GimpDisplayShell *shell,
+ gdouble x,
+ gdouble y,
+ gdouble *nx,
+ gdouble *ny);
+
+void gimp_display_shell_zoom_segments (GimpDisplayShell *shell,
+ const GimpBoundSeg *src_segs,
+ GimpSegment *dest_segs,
+ gint n_segs,
+ gdouble offset_x,
+ gdouble offset_y);
+
+
+/* rotate: functions to transform from unrotated and unflipped but
+ * zoomed display space to rotated and filpped display space and back
+ */
+
+void gimp_display_shell_rotate_coords (GimpDisplayShell *shell,
+ const GimpCoords *image_coords,
+ GimpCoords *display_coords);
+void gimp_display_shell_unrotate_coords (GimpDisplayShell *shell,
+ const GimpCoords *display_coords,
+ GimpCoords *image_coords);
+
+void gimp_display_shell_rotate_xy (GimpDisplayShell *shell,
+ gdouble x,
+ gdouble y,
+ gint *nx,
+ gint *ny);
+void gimp_display_shell_unrotate_xy (GimpDisplayShell *shell,
+ gint x,
+ gint y,
+ gint *nx,
+ gint *ny);
+
+void gimp_display_shell_rotate_xy_f (GimpDisplayShell *shell,
+ gdouble x,
+ gdouble y,
+ gdouble *nx,
+ gdouble *ny);
+void gimp_display_shell_unrotate_xy_f (GimpDisplayShell *shell,
+ gdouble x,
+ gdouble y,
+ gdouble *nx,
+ gdouble *ny);
+
+void gimp_display_shell_rotate_bounds (GimpDisplayShell *shell,
+ gdouble x1,
+ gdouble y1,
+ gdouble x2,
+ gdouble y2,
+ gdouble *nx1,
+ gdouble *ny1,
+ gdouble *nx2,
+ gdouble *ny2);
+void gimp_display_shell_unrotate_bounds (GimpDisplayShell *shell,
+ gdouble x1,
+ gdouble y1,
+ gdouble x2,
+ gdouble y2,
+ gdouble *nx1,
+ gdouble *ny1,
+ gdouble *nx2,
+ gdouble *ny2);
+
+
+/* transform: functions to transform from image space to rotated
+ * display space and back, taking into account scroll offset, scale,
+ * rotation and flipping
+ */
+
+void gimp_display_shell_transform_coords (GimpDisplayShell *shell,
+ const GimpCoords *image_coords,
+ GimpCoords *display_coords);
+void gimp_display_shell_untransform_coords (GimpDisplayShell *shell,
+ const GimpCoords *display_coords,
+ GimpCoords *image_coords);
+
+void gimp_display_shell_transform_xy (GimpDisplayShell *shell,
+ gdouble x,
+ gdouble y,
+ gint *nx,
+ gint *ny);
+void gimp_display_shell_untransform_xy (GimpDisplayShell *shell,
+ gint x,
+ gint y,
+ gint *nx,
+ gint *ny,
+ gboolean round);
+
+void gimp_display_shell_transform_xy_f (GimpDisplayShell *shell,
+ gdouble x,
+ gdouble y,
+ gdouble *nx,
+ gdouble *ny);
+void gimp_display_shell_untransform_xy_f (GimpDisplayShell *shell,
+ gdouble x,
+ gdouble y,
+ gdouble *nx,
+ gdouble *ny);
+
+void gimp_display_shell_transform_bounds (GimpDisplayShell *shell,
+ gdouble x1,
+ gdouble y1,
+ gdouble x2,
+ gdouble y2,
+ gdouble *nx1,
+ gdouble *ny1,
+ gdouble *nx2,
+ gdouble *ny2);
+void gimp_display_shell_untransform_bounds (GimpDisplayShell *shell,
+ gdouble x1,
+ gdouble y1,
+ gdouble x2,
+ gdouble y2,
+ gdouble *nx1,
+ gdouble *ny1,
+ gdouble *nx2,
+ gdouble *ny2);
+
+void gimp_display_shell_transform_bounds_with_scale (GimpDisplayShell *shell,
+ gdouble scale,
+ gdouble x1,
+ gdouble y1,
+ gdouble x2,
+ gdouble y2,
+ gdouble *nx1,
+ gdouble *ny1,
+ gdouble *nx2,
+ gdouble *ny2);
+void gimp_display_shell_untransform_bounds_with_scale (GimpDisplayShell *shell,
+ gdouble scale,
+ gdouble x1,
+ gdouble y1,
+ gdouble x2,
+ gdouble y2,
+ gdouble *nx1,
+ gdouble *ny1,
+ gdouble *nx2,
+ gdouble *ny2);
+
+void gimp_display_shell_untransform_viewport (GimpDisplayShell *shell,
+ gboolean clip,
+ gint *x,
+ gint *y,
+ gint *width,
+ gint *height);
+
+
+#endif /* __GIMP_DISPLAY_SHELL_TRANSFORM_H__ */