17ec3d130e
When the resulting matrix transforms all input points behind the camera, negate the matrix, instead of failing, which results in a matrix that transforms the input points to the corresponding points in front of the camera. This avoids rejecting certain valid transforms as invalid, in the generic transform tools (unified, perspective, and handle transform). Make the number of input and output points explicit in the function's signature, and add comments.
113 lines
7.0 KiB
C
113 lines
7.0 KiB
C
/* GIMP - The GNU Image Manipulation Program
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* Copyright (C) 1995-2001 Spencer Kimball, Peter Mattis, and others
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __GIMP_TRANSFORM_UTILS_H__
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#define __GIMP_TRANSFORM_UTILS_H__
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#define GIMP_TRANSFORM_NEAR_Z 0.02
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void gimp_transform_get_rotate_center (gint x,
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gint y,
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gint width,
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gint height,
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gboolean auto_center,
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gdouble *center_x,
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gdouble *center_y);
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void gimp_transform_get_flip_axis (gint x,
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gint y,
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gint width,
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gint height,
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GimpOrientationType flip_type,
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gboolean auto_center,
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gdouble *axis);
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void gimp_transform_matrix_flip (GimpMatrix3 *matrix,
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GimpOrientationType flip_type,
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gdouble axis);
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void gimp_transform_matrix_flip_free (GimpMatrix3 *matrix,
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gdouble x1,
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gdouble y1,
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gdouble x2,
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gdouble y2);
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void gimp_transform_matrix_rotate (GimpMatrix3 *matrix,
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GimpRotationType rotate_type,
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gdouble center_x,
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gdouble center_y);
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void gimp_transform_matrix_rotate_rect (GimpMatrix3 *matrix,
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gint x,
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gint y,
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gint width,
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gint height,
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gdouble angle);
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void gimp_transform_matrix_rotate_center (GimpMatrix3 *matrix,
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gdouble center_x,
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gdouble center_y,
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gdouble angle);
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void gimp_transform_matrix_scale (GimpMatrix3 *matrix,
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gint x,
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gint y,
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gint width,
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gint height,
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gdouble t_x,
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gdouble t_y,
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gdouble t_width,
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gdouble t_height);
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void gimp_transform_matrix_shear (GimpMatrix3 *matrix,
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gint x,
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gint y,
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gint width,
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gint height,
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GimpOrientationType orientation,
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gdouble amount);
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void gimp_transform_matrix_perspective (GimpMatrix3 *matrix,
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gint x,
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gint y,
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gint width,
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gint height,
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gdouble t_x1,
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gdouble t_y1,
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gdouble t_x2,
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gdouble t_y2,
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gdouble t_x3,
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gdouble t_y3,
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gdouble t_x4,
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gdouble t_y4);
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gboolean gimp_transform_matrix_generic (GimpMatrix3 *matrix,
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const GimpVector2 input_points[4],
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const GimpVector2 output_points[4]);
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gboolean gimp_transform_polygon_is_convex (gdouble x1,
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gdouble y1,
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gdouble x2,
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gdouble y2,
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gdouble x3,
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gdouble y3,
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gdouble x4,
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gdouble y4);
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void gimp_transform_polygon (const GimpMatrix3 *matrix,
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const GimpVector2 *vertices,
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gint n_vertices,
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gboolean closed,
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GimpVector2 *t_vertices,
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gint *n_t_vertices);
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#endif /* __GIMP_TRANSFORM_UTILS_H__ */
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