mirror of https://github.com/GNOME/gimp.git
286 lines
8.3 KiB
C
286 lines
8.3 KiB
C
/* The GIMP -- an 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 2 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, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include <glib-object.h>
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#include "libgimpmath/gimpmath.h"
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#include "core-types.h"
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#include "gimp-transform-utils.h"
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void
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gimp_transform_matrix_flip (GimpMatrix3 *matrix,
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GimpOrientationType flip_type,
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gdouble axis)
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{
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g_return_if_fail (matrix != NULL);
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switch (flip_type)
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{
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case GIMP_ORIENTATION_HORIZONTAL:
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gimp_matrix3_translate (matrix, - axis, 0.0);
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gimp_matrix3_scale (matrix, -1.0, 1.0);
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gimp_matrix3_translate (matrix, axis, 0.0);
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break;
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case GIMP_ORIENTATION_VERTICAL:
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gimp_matrix3_translate (matrix, 0.0, - axis);
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gimp_matrix3_scale (matrix, 1.0, -1.0);
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gimp_matrix3_translate (matrix, 0.0, axis);
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break;
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case GIMP_ORIENTATION_UNKNOWN:
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break;
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}
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}
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void
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gimp_transform_matrix_flip_free (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 x1,
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gdouble y1,
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gdouble x2,
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gdouble y2)
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{
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gdouble angle;
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g_return_if_fail (matrix != NULL);
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angle = atan2 (y2 - y1, x2 - x1);
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gimp_matrix3_identity (matrix);
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gimp_matrix3_translate (matrix, -x1, -y1);
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gimp_matrix3_rotate (matrix, -angle);
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gimp_matrix3_scale (matrix, 1.0, -1.0);
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gimp_matrix3_rotate (matrix, angle);
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gimp_matrix3_translate (matrix, x1, y1);
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}
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void
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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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{
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gdouble angle = 0;
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switch (rotate_type)
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{
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case GIMP_ROTATE_90:
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angle = G_PI_2;
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break;
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case GIMP_ROTATE_180:
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angle = G_PI;
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break;
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case GIMP_ROTATE_270:
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angle = - G_PI_2;
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break;
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}
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gimp_transform_matrix_rotate_center (matrix, center_x, center_y, angle);
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}
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void
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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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{
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gdouble center_x;
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gdouble center_y;
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g_return_if_fail (matrix != NULL);
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center_x = (gdouble) x + (gdouble) width / 2.0;
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center_y = (gdouble) y + (gdouble) height / 2.0;
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gimp_matrix3_translate (matrix, -center_x, -center_y);
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gimp_matrix3_rotate (matrix, angle);
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gimp_matrix3_translate (matrix, +center_x, +center_y);
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}
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void
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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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{
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g_return_if_fail (matrix != NULL);
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gimp_matrix3_translate (matrix, -center_x, -center_y);
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gimp_matrix3_rotate (matrix, angle);
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gimp_matrix3_translate (matrix, +center_x, +center_y);
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}
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void
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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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{
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gdouble scale_x = 1.0;
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gdouble scale_y = 1.0;
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g_return_if_fail (matrix != NULL);
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if (width > 0)
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scale_x = t_width / (gdouble) width;
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if (height > 0)
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scale_y = t_height / (gdouble) height;
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gimp_matrix3_identity (matrix);
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gimp_matrix3_translate (matrix, -x, -y);
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gimp_matrix3_scale (matrix, scale_x, scale_y);
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gimp_matrix3_translate (matrix, t_x, t_y);
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}
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void
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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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{
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gdouble center_x;
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gdouble center_y;
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g_return_if_fail (matrix != NULL);
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if (width == 0)
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width = 1;
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if (height == 0)
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height = 1;
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center_x = (gdouble) x + (gdouble) width / 2.0;
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center_y = (gdouble) y + (gdouble) height / 2.0;
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gimp_matrix3_identity (matrix);
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gimp_matrix3_translate (matrix, -center_x, -center_y);
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if (orientation == GIMP_ORIENTATION_HORIZONTAL)
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gimp_matrix3_xshear (matrix, amount / height);
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else
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gimp_matrix3_yshear (matrix, amount / width);
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gimp_matrix3_translate (matrix, +center_x, +center_y);
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}
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void
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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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{
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GimpMatrix3 trafo;
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gdouble scalex;
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gdouble scaley;
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g_return_if_fail (matrix != NULL);
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scalex = scaley = 1.0;
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if (width > 0)
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scalex = 1.0 / (gdouble) width;
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if (height > 0)
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scaley = 1.0 / (gdouble) height;
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gimp_matrix3_translate (matrix, -x, -y);
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gimp_matrix3_scale (matrix, scalex, scaley);
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/* Determine the perspective transform that maps from
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* the unit cube to the transformed coordinates
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*/
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{
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gdouble dx1, dx2, dx3, dy1, dy2, dy3;
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dx1 = t_x2 - t_x4;
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dx2 = t_x3 - t_x4;
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dx3 = t_x1 - t_x2 + t_x4 - t_x3;
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dy1 = t_y2 - t_y4;
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dy2 = t_y3 - t_y4;
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dy3 = t_y1 - t_y2 + t_y4 - t_y3;
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/* Is the mapping affine? */
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if ((dx3 == 0.0) && (dy3 == 0.0))
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{
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trafo.coeff[0][0] = t_x2 - t_x1;
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trafo.coeff[0][1] = t_x4 - t_x2;
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trafo.coeff[0][2] = t_x1;
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trafo.coeff[1][0] = t_y2 - t_y1;
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trafo.coeff[1][1] = t_y4 - t_y2;
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trafo.coeff[1][2] = t_y1;
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trafo.coeff[2][0] = 0.0;
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trafo.coeff[2][1] = 0.0;
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}
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else
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{
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gdouble det1, det2;
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det1 = dx3 * dy2 - dy3 * dx2;
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det2 = dx1 * dy2 - dy1 * dx2;
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trafo.coeff[2][0] = (det2 == 0.0) ? 1.0 : det1 / det2;
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det1 = dx1 * dy3 - dy1 * dx3;
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trafo.coeff[2][1] = (det2 == 0.0) ? 1.0 : det1 / det2;
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trafo.coeff[0][0] = t_x2 - t_x1 + trafo.coeff[2][0] * t_x2;
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trafo.coeff[0][1] = t_x3 - t_x1 + trafo.coeff[2][1] * t_x3;
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trafo.coeff[0][2] = t_x1;
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trafo.coeff[1][0] = t_y2 - t_y1 + trafo.coeff[2][0] * t_y2;
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trafo.coeff[1][1] = t_y3 - t_y1 + trafo.coeff[2][1] * t_y3;
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trafo.coeff[1][2] = t_y1;
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}
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trafo.coeff[2][2] = 1.0;
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}
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gimp_matrix3_mult (&trafo, matrix);
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}
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