diff options
Diffstat (limited to 'libgimpmath')
| -rw-r--r-- | libgimpmath/Makefile.am | 93 | ||||
| -rw-r--r-- | libgimpmath/Makefile.in | 1070 | ||||
| -rw-r--r-- | libgimpmath/gimpmath.def | 78 | ||||
| -rw-r--r-- | libgimpmath/gimpmath.h | 153 | ||||
| -rw-r--r-- | libgimpmath/gimpmathtypes.h | 114 | ||||
| -rw-r--r-- | libgimpmath/gimpmatrix.c | 1080 | ||||
| -rw-r--r-- | libgimpmath/gimpmatrix.h | 157 | ||||
| -rw-r--r-- | libgimpmath/gimpmd5.c | 53 | ||||
| -rw-r--r-- | libgimpmath/gimpmd5.h | 26 | ||||
| -rw-r--r-- | libgimpmath/gimpvector.c | 1129 | ||||
| -rw-r--r-- | libgimpmath/gimpvector.h | 160 |
11 files changed, 4113 insertions, 0 deletions
diff --git a/libgimpmath/Makefile.am b/libgimpmath/Makefile.am new file mode 100644 index 0000000..be67ba8 --- /dev/null +++ b/libgimpmath/Makefile.am @@ -0,0 +1,93 @@ +## Process this file with automake to produce Makefile.in + +libgimpbase = $(top_builddir)/libgimpbase/libgimpbase-$(GIMP_API_VERSION).la + +if PLATFORM_WIN32 +no_undefined = -no-undefined +endif + +if PLATFORM_WIN32 +else +libm = -lm +endif + +if OS_WIN32 +gimpmath_def = gimpmath.def +libgimpmath_export_symbols = -export-symbols $(srcdir)/gimpmath.def + +install-libtool-import-lib: + $(INSTALL) .libs/libgimpmath-$(GIMP_API_VERSION).dll.a $(DESTDIR)$(libdir) + $(INSTALL) $(srcdir)/gimpmath.def $(DESTDIR)$(libdir) + +uninstall-libtool-import-lib: + -rm $(DESTDIR)$(libdir)/libgimpmath-$(GIMP_API_VERSION).dll.a + -rm $(DESTDIR)$(libdir)/gimpmath.def +else +install-libtool-import-lib: +uninstall-libtool-import-lib: +endif + +if MS_LIB_AVAILABLE +noinst_DATA = gimpmath-$(GIMP_API_VERSION).lib + +install-ms-lib: + $(INSTALL) gimpmath-$(GIMP_API_VERSION).lib $(DESTDIR)$(libdir) + +uninstall-ms-lib: + -rm $(DESTDIR)$(libdir)/gimpmath-$(GIMP_API_VERSION).lib + +gimpmath-@GIMP_API_VERSION@.lib: gimpmath.def + lib -name:libgimpmath-$(GIMP_API_VERSION)-@LT_CURRENT_MINUS_AGE@.dll -def:gimpmath.def -out:$@ + +else +install-ms-lib: +uninstall-ms-lib: +endif + +libgimpmathincludedir = $(includedir)/gimp-$(GIMP_API_VERSION)/libgimpmath + +AM_CPPFLAGS = \ + -DG_LOG_DOMAIN=\"LibGimpMath\" \ + -DGIMP_MATH_COMPILATION \ + -I$(top_srcdir) \ + $(GLIB_CFLAGS) \ + -I$(includedir) + +EXTRA_DIST = \ + gimpmath.def + +lib_LTLIBRARIES = libgimpmath-@GIMP_API_VERSION@.la + +libgimpmath_@GIMP_API_VERSION@_la_SOURCES = \ + gimpmath.h \ + gimpmathtypes.h \ + gimpmatrix.c \ + gimpmatrix.h \ + gimpmd5.c \ + gimpmd5.h \ + gimpvector.c \ + gimpvector.h + +libgimpmathinclude_HEADERS = \ + gimpmath.h \ + gimpmathtypes.h \ + gimpmatrix.h \ + gimpmd5.h \ + gimpvector.h + +libgimpmath_@GIMP_API_VERSION@_la_LDFLAGS = \ + -version-info $(LT_VERSION_INFO) \ + $(no_undefined) \ + $(libgimpmath_export_symbols) + +EXTRA_libgimpmath_@GIMP_API_VERSION@_la_DEPENDENCIES = $(gimpmath_def) + +libgimpmath_@GIMP_API_VERSION@_la_LIBADD = \ + $(libgimpbase) \ + $(GLIB_LIBS) \ + $(libm) + + +install-data-local: install-ms-lib install-libtool-import-lib + +uninstall-local: uninstall-ms-lib uninstall-libtool-import-lib diff --git a/libgimpmath/Makefile.in b/libgimpmath/Makefile.in new file mode 100644 index 0000000..be39a21 --- /dev/null +++ b/libgimpmath/Makefile.in @@ -0,0 +1,1070 @@ +# Makefile.in generated by automake 1.16.2 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994-2020 Free Software Foundation, Inc. + +# This Makefile.in is free software; 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-name:libgimpmath-$(GIMP_API_VERSION)-@LT_CURRENT_MINUS_AGE@.dll -def:gimpmath.def -out:$@ + +@MS_LIB_AVAILABLE_FALSE@install-ms-lib: +@MS_LIB_AVAILABLE_FALSE@uninstall-ms-lib: + +install-data-local: install-ms-lib install-libtool-import-lib + +uninstall-local: uninstall-ms-lib uninstall-libtool-import-lib + +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/libgimpmath/gimpmath.def b/libgimpmath/gimpmath.def new file mode 100644 index 0000000..a32a5ba --- /dev/null +++ b/libgimpmath/gimpmath.def @@ -0,0 +1,78 @@ +EXPORTS + gimp_matrix2_determinant + gimp_matrix2_get_type + gimp_matrix2_identity + gimp_matrix2_invert + gimp_matrix2_mult + gimp_matrix2_transform_point + gimp_matrix3_affine + gimp_matrix3_determinant + gimp_matrix3_equal + gimp_matrix3_get_type + gimp_matrix3_identity + gimp_matrix3_invert + gimp_matrix3_is_affine + gimp_matrix3_is_diagonal + gimp_matrix3_is_identity + gimp_matrix3_is_simple + gimp_matrix3_mult + gimp_matrix3_rotate + gimp_matrix3_scale + gimp_matrix3_transform_point + gimp_matrix3_translate + gimp_matrix3_xshear + gimp_matrix3_yshear + gimp_matrix4_identity + gimp_matrix4_mult + gimp_matrix4_to_deg + gimp_matrix4_transform_point + gimp_md5_get_digest + gimp_param_matrix2_get_type + gimp_param_matrix3_get_type + gimp_param_spec_matrix2 + gimp_param_spec_matrix3 + gimp_vector2_add + gimp_vector2_add_val + gimp_vector2_cross_product + gimp_vector2_cross_product_val + gimp_vector2_inner_product + gimp_vector2_inner_product_val + gimp_vector2_length + gimp_vector2_length_val + gimp_vector2_mul + gimp_vector2_mul_val + gimp_vector2_neg + gimp_vector2_neg_val + gimp_vector2_new + gimp_vector2_normal + gimp_vector2_normal_val + gimp_vector2_normalize + gimp_vector2_normalize_val + gimp_vector2_rotate + gimp_vector2_rotate_val + gimp_vector2_set + gimp_vector2_sub + gimp_vector2_sub_val + gimp_vector3_add + gimp_vector3_add_val + gimp_vector3_cross_product + gimp_vector3_cross_product_val + gimp_vector3_inner_product + gimp_vector3_inner_product_val + gimp_vector3_length + gimp_vector3_length_val + gimp_vector3_mul + gimp_vector3_mul_val + gimp_vector3_neg + gimp_vector3_neg_val + gimp_vector3_new + gimp_vector3_normalize + gimp_vector3_normalize_val + gimp_vector3_rotate + gimp_vector3_rotate_val + gimp_vector3_set + gimp_vector3_sub + gimp_vector3_sub_val + gimp_vector_2d_to_3d + gimp_vector_2d_to_3d_val + gimp_vector_3d_to_2d diff --git a/libgimpmath/gimpmath.h b/libgimpmath/gimpmath.h new file mode 100644 index 0000000..c20b16f --- /dev/null +++ b/libgimpmath/gimpmath.h @@ -0,0 +1,153 @@ +/* LIBGIMP - The GIMP Library + * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball + * + * gimpmath.h + * + * This library is free software: you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 3 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library. If not, see + * <https://www.gnu.org/licenses/>. + */ + +#ifndef __GIMP_MATH_H__ +#define __GIMP_MATH_H__ + + +#include <math.h> + +#ifdef HAVE_IEEEFP_H +#include <ieeefp.h> +#endif + +#ifdef G_OS_WIN32 +#include <float.h> +#endif + +#define __GIMP_MATH_H_INSIDE__ + +#include <libgimpmath/gimpmathtypes.h> + +#include <libgimpmath/gimpmatrix.h> +#include <libgimpmath/gimpmd5.h> +#include <libgimpmath/gimpvector.h> + +#undef __GIMP_MATH_H_INSIDE__ + + +G_BEGIN_DECLS + + +/** + * SECTION: gimpmath + * @title: GimpMath + * @short_description: Mathematical definitions and macros. + * + * Mathematical definitions and macros for use both by the GIMP + * application and plug-ins. These macros should be used rather than + * the ones from <math.h> for enhanced portability. + **/ + + +/** + * RINT: + * @x: the value to be rounded + * + * This macro rounds its argument @x to an integer value in floating + * point format. Use RINT() instead of rint(). + **/ +#if defined (HAVE_RINT) && 0 +/* note: rint() depends on the current floating-point rounding mode. when the + * rounding mode is FE_TONEAREST, it, in parctice, breaks ties to even. this + * is different from 'floor (x + 0.5)', which breaks ties up. in other words + * 'rint (2.5) == 2.0', while 'floor (2.5 + 0.5) == 3.0'. this is asking for + * trouble, so let's just use the latter. + */ +#define RINT(x) rint(x) +#else +#define RINT(x) floor ((x) + 0.5) +#endif + +/** + * ROUND: + * @x: the value to be rounded. + * + * This macro rounds its positive argument @x to the nearest integer. + **/ +#define ROUND(x) ((int) ((x) + 0.5)) + +/** + * SIGNED_ROUND: + * @x: the value to be rounded. + * + * This macro rounds its argument @x to the nearest integer. + **/ +#define SIGNED_ROUND(x) ((int) RINT (x)) + +/** + * SQR: + * @x: the value to be squared. + * + * This macro squares its argument @x. + **/ +#define SQR(x) ((x) * (x)) + +/** + * MAX255: + * @a: the value to be limited. + * + * This macro limits it argument @a, an (0-511) int, to 255. + **/ +#define MAX255(a) ((a) | (((a) & 256) - (((a) & 256) >> 8))) + +/** + * CLAMP0255: + * @a: the value to be clamped. + * + * This macro clamps its argument @a, an int32-range int, between 0 + * and 255 inclusive. + **/ +#define CLAMP0255(a) CLAMP(a,0,255) + +/** + * SAFE_CLAMP: + * @x: the value to be limited. + * @low: the lower limit. + * @high: the upper limit. + * + * Ensures that @x is between the limits set by @low and @high, + * even if @x is NaN. If @low is greater than @high, or if either + * of them is NaN, the result is undefined. + * + * Since: 2.10 + **/ +#define SAFE_CLAMP(x, low, high) ((x) > (low) ? (x) < (high) ? (x) : (high) : (low)) + +/** + * gimp_deg_to_rad: + * @angle: the angle to be converted. + * + * This macro converts its argument @angle from degree to radian. + **/ +#define gimp_deg_to_rad(angle) ((angle) * (2.0 * G_PI) / 360.0) + +/** + * gimp_rad_to_deg: + * @angle: the angle to be converted. + * + * This macro converts its argument @angle from radian to degree. + **/ +#define gimp_rad_to_deg(angle) ((angle) * 360.0 / (2.0 * G_PI)) + + +G_END_DECLS + +#endif /* __GIMP_MATH_H__ */ diff --git a/libgimpmath/gimpmathtypes.h b/libgimpmath/gimpmathtypes.h new file mode 100644 index 0000000..a6f4628 --- /dev/null +++ b/libgimpmath/gimpmathtypes.h @@ -0,0 +1,114 @@ +/* LIBGIMP - The GIMP Library + * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball + * + * gimpmathtypes.h + * + * This library is free software: you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 3 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library. If not, see + * <https://www.gnu.org/licenses/>. + */ + +#ifndef __GIMP_MATH_TYPES_H__ +#define __GIMP_MATH_TYPES_H__ + + +#include <libgimpbase/gimpbasetypes.h> + + +G_BEGIN_DECLS + +typedef struct _GimpMatrix2 GimpMatrix2; +typedef struct _GimpMatrix3 GimpMatrix3; +typedef struct _GimpMatrix4 GimpMatrix4; + +/** + * GimpMatrix2 + * @coeff: the coefficients + * + * A two by two matrix. + **/ +struct _GimpMatrix2 +{ + gdouble coeff[2][2]; +}; + +/** + * GimpMatrix3 + * @coeff: the coefficients + * + * A three by three matrix. + **/ +struct _GimpMatrix3 +{ + gdouble coeff[3][3]; +}; + +/** + * GimpMatrix4 + * @coeff: the coefficients + * + * A four by four matrix. + **/ +struct _GimpMatrix4 +{ + gdouble coeff[4][4]; +}; + + +typedef struct _GimpVector2 GimpVector2; +typedef struct _GimpVector3 GimpVector3; +typedef struct _GimpVector4 GimpVector4; + +/** + * GimpVector2: + * @x: the x axis + * @y: the y axis + * + * A two dimensional vector. + **/ +struct _GimpVector2 +{ + gdouble x, y; +}; + +/** + * GimpVector3: + * @x: the x axis + * @y: the y axis + * @z: the z axis + * + * A three dimensional vector. + **/ +struct _GimpVector3 +{ + gdouble x, y, z; +}; + +/** + * GimpVector4: + * @x: the x axis + * @y: the y axis + * @z: the z axis + * @w: the w axis + * + * A four dimensional vector. + **/ +struct _GimpVector4 +{ + gdouble x, y, z, w; +}; + + +G_END_DECLS + +#endif /* __GIMP_MATH_TYPES_H__ */ diff --git a/libgimpmath/gimpmatrix.c b/libgimpmath/gimpmatrix.c new file mode 100644 index 0000000..ebee392 --- /dev/null +++ b/libgimpmath/gimpmatrix.c @@ -0,0 +1,1080 @@ +/* LIBGIMP - The GIMP Library + * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball + * + * gimpmatrix.c + * Copyright (C) 1998 Jay Cox <jaycox@gimp.org> + * + * This library is free software: you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 3 of the License, or (at your option) any later version. + * + * This library 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 + * Library General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library. If not, see + * <https://www.gnu.org/licenses/>. + */ + +#include "config.h" + +#include <glib-object.h> + +#include "gimpmath.h" + + +/** + * SECTION: gimpmatrix + * @title: GimpMatrix + * @short_description: Utilities to set up and manipulate 3x3 + * transformation matrices. + * @see_also: #GimpVector2, #GimpVector3, #GimpVector4 + * + * When doing image manipulation you will often need 3x3 + * transformation matrices that define translation, rotation, scaling, + * shearing and arbitrary perspective transformations using a 3x3 + * matrix. Here you'll find a set of utility functions to set up those + * matrices and to perform basic matrix manipulations and tests. + * + * Each matrix class has a 2 dimensional gdouble coeff member. The + * element for row r and column c of the matrix is coeff[r][c]. + **/ + + +#define EPSILON 1e-6 + + +static GimpMatrix2 * matrix2_copy (const GimpMatrix2 *matrix); + +/** + * gimp_matrix2_get_type: + * + * Reveals the object type + * + * Returns: the #GType for Matrix2 objects + * + * Since: 2.4 + **/ +GType +gimp_matrix2_get_type (void) +{ + static GType matrix_type = 0; + + if (!matrix_type) + matrix_type = g_boxed_type_register_static ("GimpMatrix2", + (GBoxedCopyFunc) matrix2_copy, + (GBoxedFreeFunc) g_free); + + return matrix_type; +} + + +/* + * GIMP_TYPE_PARAM_MATRIX2 + */ + +#define GIMP_PARAM_SPEC_MATRIX2(pspec) (G_TYPE_CHECK_INSTANCE_CAST ((pspec), GIMP_TYPE_PARAM_MATRIX2, GimpParamSpecMatrix2)) + +static void gimp_param_matrix2_class_init (GParamSpecClass *class); +static void gimp_param_matrix2_init (GParamSpec *pspec); +static void gimp_param_matrix2_set_default (GParamSpec *pspec, + GValue *value); +static gint gimp_param_matrix2_values_cmp (GParamSpec *pspec, + const GValue *value1, + const GValue *value2); + +typedef struct _GimpParamSpecMatrix2 GimpParamSpecMatrix2; + +struct _GimpParamSpecMatrix2 +{ + GParamSpecBoxed parent_instance; + + GimpMatrix2 default_value; +}; + +/** + * gimp_param_matrix2_get_type: + * + * Reveals the object type + * + * Returns: the #GType for a GimpMatrix2 object + * + * Since: 2.4 + **/ +GType +gimp_param_matrix2_get_type (void) +{ + static GType spec_type = 0; + + if (!spec_type) + { + static const GTypeInfo type_info = + { + sizeof (GParamSpecClass), + NULL, NULL, + (GClassInitFunc) gimp_param_matrix2_class_init, + NULL, NULL, + sizeof (GimpParamSpecMatrix2), + 0, + (GInstanceInitFunc) gimp_param_matrix2_init + }; + + spec_type = g_type_register_static (G_TYPE_PARAM_BOXED, + "GimpParamMatrix2", + &type_info, 0); + } + + return spec_type; +} + +static void +gimp_param_matrix2_class_init (GParamSpecClass *class) +{ + class->value_type = GIMP_TYPE_MATRIX2; + class->value_set_default = gimp_param_matrix2_set_default; + class->values_cmp = gimp_param_matrix2_values_cmp; +} + +static void +gimp_param_matrix2_init (GParamSpec *pspec) +{ + GimpParamSpecMatrix2 *cspec = GIMP_PARAM_SPEC_MATRIX2 (pspec); + + gimp_matrix2_identity (&cspec->default_value); +} + +static void +gimp_param_matrix2_set_default (GParamSpec *pspec, + GValue *value) +{ + GimpParamSpecMatrix2 *cspec = GIMP_PARAM_SPEC_MATRIX2 (pspec); + + g_value_set_static_boxed (value, &cspec->default_value); +} + +static gint +gimp_param_matrix2_values_cmp (GParamSpec *pspec, + const GValue *value1, + const GValue *value2) +{ + GimpMatrix2 *matrix1; + GimpMatrix2 *matrix2; + gint i, j; + + matrix1 = value1->data[0].v_pointer; + matrix2 = value2->data[0].v_pointer; + + /* try to return at least *something*, it's useless anyway... */ + + if (! matrix1) + return matrix2 != NULL ? -1 : 0; + else if (! matrix2) + return matrix1 != NULL; + + for (i = 0; i < 2; i++) + for (j = 0; j < 2; j++) + if (matrix1->coeff[i][j] != matrix2->coeff[i][j]) + return 1; + + return 0; +} + +/** + * gimp_param_spec_matrix2: + * @name: Canonical name of the param + * @nick: Nickname of the param + * @blurb: Brief description of param. + * @default_value: Value to use if none is assigned. + * @flags: a combination of #GParamFlags + * + * Creates a param spec to hold a #GimpMatrix2 value. + * See g_param_spec_internal() for more information. + * + * Returns: a newly allocated #GParamSpec instance + * + * Since: 2.4 + **/ +GParamSpec * +gimp_param_spec_matrix2 (const gchar *name, + const gchar *nick, + const gchar *blurb, + const GimpMatrix2 *default_value, + GParamFlags flags) +{ + GimpParamSpecMatrix2 *cspec; + + g_return_val_if_fail (default_value != NULL, NULL); + + cspec = g_param_spec_internal (GIMP_TYPE_PARAM_MATRIX2, + name, nick, blurb, flags); + + cspec->default_value = *default_value; + + return G_PARAM_SPEC (cspec); +} + + +static GimpMatrix2 * +matrix2_copy (const GimpMatrix2 *matrix) +{ + return (GimpMatrix2 *) g_memdup (matrix, sizeof (GimpMatrix2)); +} + + +/** + * gimp_matrix2_identity: + * @matrix: A matrix. + * + * Sets the matrix to the identity matrix. + */ +void +gimp_matrix2_identity (GimpMatrix2 *matrix) +{ + static const GimpMatrix2 identity = { { { 1.0, 0.0 }, + { 0.0, 1.0 } } }; + + *matrix = identity; +} + +/** + * gimp_matrix2_mult: + * @matrix1: The first input matrix. + * @matrix2: The second input matrix which will be overwritten by the result. + * + * Multiplies two matrices and puts the result into the second one. + */ +void +gimp_matrix2_mult (const GimpMatrix2 *matrix1, + GimpMatrix2 *matrix2) +{ + GimpMatrix2 tmp; + + tmp.coeff[0][0] = (matrix1->coeff[0][0] * matrix2->coeff[0][0] + + matrix1->coeff[0][1] * matrix2->coeff[1][0]); + tmp.coeff[0][1] = (matrix1->coeff[0][0] * matrix2->coeff[0][1] + + matrix1->coeff[0][1] * matrix2->coeff[1][1]); + tmp.coeff[1][0] = (matrix1->coeff[1][0] * matrix2->coeff[0][0] + + matrix1->coeff[1][1] * matrix2->coeff[1][0]); + tmp.coeff[1][1] = (matrix1->coeff[1][0] * matrix2->coeff[0][1] + + matrix1->coeff[1][1] * matrix2->coeff[1][1]); + + *matrix2 = tmp; +} + +/** + * gimp_matrix2_determinant: + * @matrix: The input matrix. + * + * Calculates the determinant of the given matrix. + * + * Returns: The determinant. + * + * Since: 2.10.16 + */ + +gdouble +gimp_matrix2_determinant (const GimpMatrix2 *matrix) +{ + return matrix->coeff[0][0] * matrix->coeff[1][1] - + matrix->coeff[0][1] * matrix->coeff[1][0]; +} + +/** + * gimp_matrix2_invert: + * @matrix: The matrix that is to be inverted. + * + * Inverts the given matrix. + * + * Since: 2.10.16 + */ +void +gimp_matrix2_invert (GimpMatrix2 *matrix) +{ + gdouble det = gimp_matrix2_determinant (matrix); + gdouble temp; + + if (fabs (det) <= EPSILON) + return; + + temp = matrix->coeff[0][0]; + + matrix->coeff[0][0] = matrix->coeff[1][1] / det; + matrix->coeff[0][1] /= -det; + matrix->coeff[1][0] /= -det; + matrix->coeff[1][1] = temp / det; +} + +/** + * gimp_matrix2_transform_point: + * @matrix: The transformation matrix. + * @x: The source X coordinate. + * @y: The source Y coordinate. + * @newx: The transformed X coordinate. + * @newy: The transformed Y coordinate. + * + * Transforms a point in 2D as specified by the transformation matrix. + * + * Since: 2.10.16 + */ +void +gimp_matrix2_transform_point (const GimpMatrix2 *matrix, + gdouble x, + gdouble y, + gdouble *newx, + gdouble *newy) +{ + *newx = matrix->coeff[0][0] * x + matrix->coeff[0][1] * y; + *newy = matrix->coeff[1][0] * x + matrix->coeff[1][1] * y; +} + + +static GimpMatrix3 * matrix3_copy (const GimpMatrix3 *matrix); + +/** + * gimp_matrix3_get_type: + * + * Reveals the object type + * + * Returns: the #GType for Matrix3 objects + * + * Since: 2.8 + **/ +GType +gimp_matrix3_get_type (void) +{ + static GType matrix_type = 0; + + if (!matrix_type) + matrix_type = g_boxed_type_register_static ("GimpMatrix3", + (GBoxedCopyFunc) matrix3_copy, + (GBoxedFreeFunc) g_free); + + return matrix_type; +} + + +/* + * GIMP_TYPE_PARAM_MATRIX3 + */ + +#define GIMP_PARAM_SPEC_MATRIX3(pspec) (G_TYPE_CHECK_INSTANCE_CAST ((pspec), GIMP_TYPE_PARAM_MATRIX3, GimpParamSpecMatrix3)) + +static void gimp_param_matrix3_class_init (GParamSpecClass *class); +static void gimp_param_matrix3_init (GParamSpec *pspec); +static void gimp_param_matrix3_set_default (GParamSpec *pspec, + GValue *value); +static gint gimp_param_matrix3_values_cmp (GParamSpec *pspec, + const GValue *value1, + const GValue *value2); + +typedef struct _GimpParamSpecMatrix3 GimpParamSpecMatrix3; + +struct _GimpParamSpecMatrix3 +{ + GParamSpecBoxed parent_instance; + + GimpMatrix3 default_value; +}; + +/** + * gimp_param_matrix3_get_type: + * + * Reveals the object type + * + * Returns: the #GType for a GimpMatrix3 object + * + * Since: 2.8 + **/ +GType +gimp_param_matrix3_get_type (void) +{ + static GType spec_type = 0; + + if (!spec_type) + { + static const GTypeInfo type_info = + { + sizeof (GParamSpecClass), + NULL, NULL, + (GClassInitFunc) gimp_param_matrix3_class_init, + NULL, NULL, + sizeof (GimpParamSpecMatrix3), + 0, + (GInstanceInitFunc) gimp_param_matrix3_init + }; + + spec_type = g_type_register_static (G_TYPE_PARAM_BOXED, + "GimpParamMatrix3", + &type_info, 0); + } + + return spec_type; +} + +static void +gimp_param_matrix3_class_init (GParamSpecClass *class) +{ + class->value_type = GIMP_TYPE_MATRIX3; + class->value_set_default = gimp_param_matrix3_set_default; + class->values_cmp = gimp_param_matrix3_values_cmp; +} + +static void +gimp_param_matrix3_init (GParamSpec *pspec) +{ + GimpParamSpecMatrix3 *cspec = GIMP_PARAM_SPEC_MATRIX3 (pspec); + + gimp_matrix3_identity (&cspec->default_value); +} + +static void +gimp_param_matrix3_set_default (GParamSpec *pspec, + GValue *value) +{ + GimpParamSpecMatrix3 *cspec = GIMP_PARAM_SPEC_MATRIX3 (pspec); + + g_value_set_static_boxed (value, &cspec->default_value); +} + +static gint +gimp_param_matrix3_values_cmp (GParamSpec *pspec, + const GValue *value1, + const GValue *value2) +{ + GimpMatrix3 *matrix1; + GimpMatrix3 *matrix2; + gint i, j; + + matrix1 = value1->data[0].v_pointer; + matrix2 = value2->data[0].v_pointer; + + /* try to return at least *something*, it's useless anyway... */ + + if (! matrix1) + return matrix2 != NULL ? -1 : 0; + else if (! matrix2) + return matrix1 != NULL; + + for (i = 0; i < 3; i++) + for (j = 0; j < 3; j++) + if (matrix1->coeff[i][j] != matrix2->coeff[i][j]) + return 1; + + return 0; +} + +/** + * gimp_param_spec_matrix3: + * @name: Canonical name of the param + * @nick: Nickname of the param + * @blurb: Brief description of param. + * @default_value: Value to use if none is assigned. + * @flags: a combination of #GParamFlags + * + * Creates a param spec to hold a #GimpMatrix3 value. + * See g_param_spec_internal() for more information. + * + * Returns: a newly allocated #GParamSpec instance + * + * Since: 2.8 + **/ +GParamSpec * +gimp_param_spec_matrix3 (const gchar *name, + const gchar *nick, + const gchar *blurb, + const GimpMatrix3 *default_value, + GParamFlags flags) +{ + GimpParamSpecMatrix3 *cspec; + + cspec = g_param_spec_internal (GIMP_TYPE_PARAM_MATRIX3, + name, nick, blurb, flags); + + if (default_value) + cspec->default_value = *default_value; + + return G_PARAM_SPEC (cspec); +} + + +static GimpMatrix3 * +matrix3_copy (const GimpMatrix3 *matrix) +{ + return (GimpMatrix3 *) g_memdup (matrix, sizeof (GimpMatrix3)); +} + + +/** + * gimp_matrix3_identity: + * @matrix: A matrix. + * + * Sets the matrix to the identity matrix. + */ +void +gimp_matrix3_identity (GimpMatrix3 *matrix) +{ + static const GimpMatrix3 identity = { { { 1.0, 0.0, 0.0 }, + { 0.0, 1.0, 0.0 }, + { 0.0, 0.0, 1.0 } } }; + + *matrix = identity; +} + +/** + * gimp_matrix3_transform_point: + * @matrix: The transformation matrix. + * @x: The source X coordinate. + * @y: The source Y coordinate. + * @newx: The transformed X coordinate. + * @newy: The transformed Y coordinate. + * + * Transforms a point in 2D as specified by the transformation matrix. + */ +void +gimp_matrix3_transform_point (const GimpMatrix3 *matrix, + gdouble x, + gdouble y, + gdouble *newx, + gdouble *newy) +{ + gdouble w; + + w = matrix->coeff[2][0] * x + matrix->coeff[2][1] * y + matrix->coeff[2][2]; + + if (w == 0.0) + w = 1.0; + else + w = 1.0/w; + + *newx = (matrix->coeff[0][0] * x + + matrix->coeff[0][1] * y + + matrix->coeff[0][2]) * w; + *newy = (matrix->coeff[1][0] * x + + matrix->coeff[1][1] * y + + matrix->coeff[1][2]) * w; +} + +/** + * gimp_matrix3_mult: + * @matrix1: The first input matrix. + * @matrix2: The second input matrix which will be overwritten by the result. + * + * Multiplies two matrices and puts the result into the second one. + */ +void +gimp_matrix3_mult (const GimpMatrix3 *matrix1, + GimpMatrix3 *matrix2) +{ + gint i, j; + GimpMatrix3 tmp; + gdouble t1, t2, t3; + + for (i = 0; i < 3; i++) + { + t1 = matrix1->coeff[i][0]; + t2 = matrix1->coeff[i][1]; + t3 = matrix1->coeff[i][2]; + + for (j = 0; j < 3; j++) + { + tmp.coeff[i][j] = t1 * matrix2->coeff[0][j]; + tmp.coeff[i][j] += t2 * matrix2->coeff[1][j]; + tmp.coeff[i][j] += t3 * matrix2->coeff[2][j]; + } + } + + *matrix2 = tmp; +} + +/** + * gimp_matrix3_translate: + * @matrix: The matrix that is to be translated. + * @x: Translation in X direction. + * @y: Translation in Y direction. + * + * Translates the matrix by x and y. + */ +void +gimp_matrix3_translate (GimpMatrix3 *matrix, + gdouble x, + gdouble y) +{ + gdouble g, h, i; + + g = matrix->coeff[2][0]; + h = matrix->coeff[2][1]; + i = matrix->coeff[2][2]; + + matrix->coeff[0][0] += x * g; + matrix->coeff[0][1] += x * h; + matrix->coeff[0][2] += x * i; + matrix->coeff[1][0] += y * g; + matrix->coeff[1][1] += y * h; + matrix->coeff[1][2] += y * i; +} + +/** + * gimp_matrix3_scale: + * @matrix: The matrix that is to be scaled. + * @x: X scale factor. + * @y: Y scale factor. + * + * Scales the matrix by x and y + */ +void +gimp_matrix3_scale (GimpMatrix3 *matrix, + gdouble x, + gdouble y) +{ + matrix->coeff[0][0] *= x; + matrix->coeff[0][1] *= x; + matrix->coeff[0][2] *= x; + + matrix->coeff[1][0] *= y; + matrix->coeff[1][1] *= y; + matrix->coeff[1][2] *= y; +} + +/** + * gimp_matrix3_rotate: + * @matrix: The matrix that is to be rotated. + * @theta: The angle of rotation (in radians). + * + * Rotates the matrix by theta degrees. + */ +void +gimp_matrix3_rotate (GimpMatrix3 *matrix, + gdouble theta) +{ + gdouble t1, t2; + gdouble cost, sint; + + cost = cos (theta); + sint = sin (theta); + + t1 = matrix->coeff[0][0]; + t2 = matrix->coeff[1][0]; + matrix->coeff[0][0] = cost * t1 - sint * t2; + matrix->coeff[1][0] = sint * t1 + cost * t2; + + t1 = matrix->coeff[0][1]; + t2 = matrix->coeff[1][1]; + matrix->coeff[0][1] = cost * t1 - sint * t2; + matrix->coeff[1][1] = sint * t1 + cost * t2; + + t1 = matrix->coeff[0][2]; + t2 = matrix->coeff[1][2]; + matrix->coeff[0][2] = cost * t1 - sint * t2; + matrix->coeff[1][2] = sint * t1 + cost * t2; +} + +/** + * gimp_matrix3_xshear: + * @matrix: The matrix that is to be sheared. + * @amount: X shear amount. + * + * Shears the matrix in the X direction. + */ +void +gimp_matrix3_xshear (GimpMatrix3 *matrix, + gdouble amount) +{ + matrix->coeff[0][0] += amount * matrix->coeff[1][0]; + matrix->coeff[0][1] += amount * matrix->coeff[1][1]; + matrix->coeff[0][2] += amount * matrix->coeff[1][2]; +} + +/** + * gimp_matrix3_yshear: + * @matrix: The matrix that is to be sheared. + * @amount: Y shear amount. + * + * Shears the matrix in the Y direction. + */ +void +gimp_matrix3_yshear (GimpMatrix3 *matrix, + gdouble amount) +{ + matrix->coeff[1][0] += amount * matrix->coeff[0][0]; + matrix->coeff[1][1] += amount * matrix->coeff[0][1]; + matrix->coeff[1][2] += amount * matrix->coeff[0][2]; +} + +/** + * gimp_matrix3_affine: + * @matrix: The input matrix. + * @a: the 'a' coefficient + * @b: the 'b' coefficient + * @c: the 'c' coefficient + * @d: the 'd' coefficient + * @e: the 'e' coefficient + * @f: the 'f' coefficient + * + * Applies the affine transformation given by six values to @matrix. + * The six values form define an affine transformation matrix as + * illustrated below: + * + * ( a c e ) + * ( b d f ) + * ( 0 0 1 ) + **/ +void +gimp_matrix3_affine (GimpMatrix3 *matrix, + gdouble a, + gdouble b, + gdouble c, + gdouble d, + gdouble e, + gdouble f) +{ + GimpMatrix3 affine; + + affine.coeff[0][0] = a; + affine.coeff[1][0] = b; + affine.coeff[2][0] = 0.0; + + affine.coeff[0][1] = c; + affine.coeff[1][1] = d; + affine.coeff[2][1] = 0.0; + + affine.coeff[0][2] = e; + affine.coeff[1][2] = f; + affine.coeff[2][2] = 1.0; + + gimp_matrix3_mult (&affine, matrix); +} + +/** + * gimp_matrix3_determinant: + * @matrix: The input matrix. + * + * Calculates the determinant of the given matrix. + * + * Returns: The determinant. + */ +gdouble +gimp_matrix3_determinant (const GimpMatrix3 *matrix) +{ + gdouble determinant; + + determinant = (matrix->coeff[0][0] * + (matrix->coeff[1][1] * matrix->coeff[2][2] - + matrix->coeff[1][2] * matrix->coeff[2][1])); + determinant -= (matrix->coeff[1][0] * + (matrix->coeff[0][1] * matrix->coeff[2][2] - + matrix->coeff[0][2] * matrix->coeff[2][1])); + determinant += (matrix->coeff[2][0] * + (matrix->coeff[0][1] * matrix->coeff[1][2] - + matrix->coeff[0][2] * matrix->coeff[1][1])); + + return determinant; +} + +/** + * gimp_matrix3_invert: + * @matrix: The matrix that is to be inverted. + * + * Inverts the given matrix. + */ +void +gimp_matrix3_invert (GimpMatrix3 *matrix) +{ + GimpMatrix3 inv; + gdouble det; + + det = gimp_matrix3_determinant (matrix); + + if (det == 0.0) + return; + + det = 1.0 / det; + + inv.coeff[0][0] = (matrix->coeff[1][1] * matrix->coeff[2][2] - + matrix->coeff[1][2] * matrix->coeff[2][1]) * det; + + inv.coeff[1][0] = - (matrix->coeff[1][0] * matrix->coeff[2][2] - + matrix->coeff[1][2] * matrix->coeff[2][0]) * det; + + inv.coeff[2][0] = (matrix->coeff[1][0] * matrix->coeff[2][1] - + matrix->coeff[1][1] * matrix->coeff[2][0]) * det; + + inv.coeff[0][1] = - (matrix->coeff[0][1] * matrix->coeff[2][2] - + matrix->coeff[0][2] * matrix->coeff[2][1]) * det; + + inv.coeff[1][1] = (matrix->coeff[0][0] * matrix->coeff[2][2] - + matrix->coeff[0][2] * matrix->coeff[2][0]) * det; + + inv.coeff[2][1] = - (matrix->coeff[0][0] * matrix->coeff[2][1] - + matrix->coeff[0][1] * matrix->coeff[2][0]) * det; + + inv.coeff[0][2] = (matrix->coeff[0][1] * matrix->coeff[1][2] - + matrix->coeff[0][2] * matrix->coeff[1][1]) * det; + + inv.coeff[1][2] = - (matrix->coeff[0][0] * matrix->coeff[1][2] - + matrix->coeff[0][2] * matrix->coeff[1][0]) * det; + + inv.coeff[2][2] = (matrix->coeff[0][0] * matrix->coeff[1][1] - + matrix->coeff[0][1] * matrix->coeff[1][0]) * det; + + *matrix = inv; +} + + +/* functions to test for matrix properties */ + +/** + * gimp_matrix3_is_identity: + * @matrix: The matrix that is to be tested. + * + * Checks if the given matrix is the identity matrix. + * + * Returns: %TRUE if the matrix is the identity matrix, %FALSE otherwise + */ +gboolean +gimp_matrix3_is_identity (const GimpMatrix3 *matrix) +{ + gint i, j; + + for (i = 0; i < 3; i++) + { + for (j = 0; j < 3; j++) + { + if (i == j) + { + if (fabs (matrix->coeff[i][j] - 1.0) > EPSILON) + return FALSE; + } + else + { + if (fabs (matrix->coeff[i][j]) > EPSILON) + return FALSE; + } + } + } + + return TRUE; +} + +/** + * gimp_matrix3_is_diagonal: + * @matrix: The matrix that is to be tested. + * + * Checks if the given matrix is diagonal. + * + * Returns: %TRUE if the matrix is diagonal, %FALSE otherwise + */ +gboolean +gimp_matrix3_is_diagonal (const GimpMatrix3 *matrix) +{ + gint i, j; + + for (i = 0; i < 3; i++) + { + for (j = 0; j < 3; j++) + { + if (i != j && fabs (matrix->coeff[i][j]) > EPSILON) + return FALSE; + } + } + + return TRUE; +} + +/** + * gimp_matrix3_is_affine: + * @matrix: The matrix that is to be tested. + * + * Checks if the given matrix defines an affine transformation. + * + * Returns: %TRUE if the matrix defines an affine transformation, + * %FALSE otherwise + * + * Since: 2.4 + */ +gboolean +gimp_matrix3_is_affine (const GimpMatrix3 *matrix) +{ + return (fabs (matrix->coeff[2][0]) < EPSILON && + fabs (matrix->coeff[2][1]) < EPSILON && + fabs (matrix->coeff[2][2] - 1.0) < EPSILON); +} + +/** + * gimp_matrix3_is_simple: + * @matrix: The matrix that is to be tested. + * + * Checks if we'll need to interpolate when applying this matrix as + * a transformation. + * + * Returns: %TRUE if all entries of the upper left 2x2 matrix are + * either 0 or 1, %FALSE otherwise + */ +gboolean +gimp_matrix3_is_simple (const GimpMatrix3 *matrix) +{ + gdouble absm; + gint i, j; + + for (i = 0; i < 2; i++) + { + for (j = 0; j < 2; j++) + { + absm = fabs (matrix->coeff[i][j]); + if (absm > EPSILON && fabs (absm - 1.0) > EPSILON) + return FALSE; + } + } + + return TRUE; +} + +/** + * gimp_matrix3_equal: + * @matrix1: The first matrix + * @matrix2: The second matrix + * + * Checks if two matrices are equal. + * + * Returns: %TRUE the matrices are equal, %FALSE otherwise + * + * Since: 2.10.16 + */ +gboolean +gimp_matrix3_equal (const GimpMatrix3 *matrix1, + const GimpMatrix3 *matrix2) +{ + gint i, j; + + for (i = 0; i < 3; i++) + { + for (j = 0; j < 3; j++) + { + if (fabs (matrix1->coeff[i][j] - matrix2->coeff[i][j]) > EPSILON) + return FALSE; + } + } + + return TRUE; +} + +/** + * gimp_matrix4_identity: + * @matrix: A matrix. + * + * Sets the matrix to the identity matrix. + * + * Since: 2.10.16 + */ +void +gimp_matrix4_identity (GimpMatrix4 *matrix) +{ + gint i, j; + + for (i = 0; i < 4; i++) + { + for (j = 0; j < 4; j++) + matrix->coeff[i][j] = i == j; + } +} + +/** + * gimp_matrix4_mult: + * @matrix1: The first input matrix. + * @matrix2: The second input matrix which will be overwritten by the result. + * + * Multiplies two matrices and puts the result into the second one. + * + * Since: 2.10.16 + */ +void +gimp_matrix4_mult (const GimpMatrix4 *matrix1, + GimpMatrix4 *matrix2) +{ + GimpMatrix4 result = {}; + gint i, j, k; + + for (i = 0; i < 4; i++) + { + for (j = 0; j < 4; j++) + { + for (k = 0; k < 4; k++) + result.coeff[i][j] += matrix1->coeff[i][k] * matrix2->coeff[k][j]; + } + } + + *matrix2 = result; +} + +/** + * gimp_matrix4_to_deg: + * @matrix: + * @a: + * @b: + * @c: + * + * + **/ +void +gimp_matrix4_to_deg (const GimpMatrix4 *matrix, + gdouble *a, + gdouble *b, + gdouble *c) +{ + *a = 180 * (asin (matrix->coeff[1][0]) / G_PI_2); + *b = 180 * (asin (matrix->coeff[2][0]) / G_PI_2); + *c = 180 * (asin (matrix->coeff[2][1]) / G_PI_2); +} + +/** + * gimp_matrix4_transform_point: + * @matrix: The transformation matrix. + * @x: The source X coordinate. + * @y: The source Y coordinate. + * @z: The source Z coordinate. + * @newx: The transformed X coordinate. + * @newy: The transformed Y coordinate. + * @newz: The transformed Z coordinate. + * + * Transforms a point in 3D as specified by the transformation matrix. + * + * Returns: The transformed W coordinate. + * + * Since: 2.10.16 + */ +gdouble +gimp_matrix4_transform_point (const GimpMatrix4 *matrix, + gdouble x, + gdouble y, + gdouble z, + gdouble *newx, + gdouble *newy, + gdouble *newz) +{ + gdouble neww; + + *newx = matrix->coeff[0][0] * x + + matrix->coeff[0][1] * y + + matrix->coeff[0][2] * z + + matrix->coeff[0][3]; + *newy = matrix->coeff[1][0] * x + + matrix->coeff[1][1] * y + + matrix->coeff[1][2] * z + + matrix->coeff[1][3]; + *newz = matrix->coeff[2][0] * x + + matrix->coeff[2][1] * y + + matrix->coeff[2][2] * z + + matrix->coeff[2][3]; + neww = matrix->coeff[3][0] * x + + matrix->coeff[3][1] * y + + matrix->coeff[3][2] * z + + matrix->coeff[3][3]; + + *newx /= neww; + *newy /= neww; + *newz /= neww; + + return neww; +} diff --git a/libgimpmath/gimpmatrix.h b/libgimpmath/gimpmatrix.h new file mode 100644 index 0000000..a71a218 --- /dev/null +++ b/libgimpmath/gimpmatrix.h @@ -0,0 +1,157 @@ +/* LIBGIMP - The GIMP Library + * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball + * + * gimpmatrix.h + * Copyright (C) 1998 Jay Cox <jaycox@gimp.org> + * + * This library is free software: you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 3 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library. If not, see + * <https://www.gnu.org/licenses/>. + */ + +#if !defined (__GIMP_MATH_H_INSIDE__) && !defined (GIMP_MATH_COMPILATION) +#error "Only <libgimpmath/gimpmath.h> can be included directly." +#endif + +#ifndef __GIMP_MATRIX_H__ +#define __GIMP_MATRIX_H__ + +G_BEGIN_DECLS + +/* For information look into the C source or the html documentation */ + + +/*****************/ +/* GimpMatrix2 */ +/*****************/ + +#define GIMP_TYPE_MATRIX2 (gimp_matrix2_get_type ()) +#define GIMP_VALUE_HOLDS_MATRIX2(value) (G_TYPE_CHECK_VALUE_TYPE ((value), GIMP_TYPE_MATRIX2)) + +GType gimp_matrix2_get_type (void) G_GNUC_CONST; + + +#define GIMP_TYPE_PARAM_MATRIX2 (gimp_param_matrix2_get_type ()) +#define GIMP_IS_PARAM_SPEC_MATRIX2(pspec) (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), GIMP_TYPE_PARAM_MATRIX2)) + +GType gimp_param_matrix2_get_type (void) G_GNUC_CONST; + +GParamSpec * gimp_param_spec_matrix2 (const gchar *name, + const gchar *nick, + const gchar *blurb, + const GimpMatrix2 *default_value, + GParamFlags flags); + + +void gimp_matrix2_identity (GimpMatrix2 *matrix); +void gimp_matrix2_mult (const GimpMatrix2 *matrix1, + GimpMatrix2 *matrix2); + +gdouble gimp_matrix2_determinant (const GimpMatrix2 *matrix); +void gimp_matrix2_invert (GimpMatrix2 *matrix); + +void gimp_matrix2_transform_point (const GimpMatrix2 *matrix, + gdouble x, + gdouble y, + gdouble *newx, + gdouble *newy); + + +/*****************/ +/* GimpMatrix3 */ +/*****************/ + +#define GIMP_TYPE_MATRIX3 (gimp_matrix3_get_type ()) +#define GIMP_VALUE_HOLDS_MATRIX3(value) (G_TYPE_CHECK_VALUE_TYPE ((value), GIMP_TYPE_MATRIX3)) + +GType gimp_matrix3_get_type (void) G_GNUC_CONST; + + +#define GIMP_TYPE_PARAM_MATRIX3 (gimp_param_matrix3_get_type ()) +#define GIMP_IS_PARAM_SPEC_MATRIX3(pspec) (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), GIMP_TYPE_PARAM_MATRIX3)) + +GType gimp_param_matrix3_get_type (void) G_GNUC_CONST; + +GParamSpec * gimp_param_spec_matrix3 (const gchar *name, + const gchar *nick, + const gchar *blurb, + const GimpMatrix3 *default_value, + GParamFlags flags); + + +void gimp_matrix3_identity (GimpMatrix3 *matrix); +void gimp_matrix3_mult (const GimpMatrix3 *matrix1, + GimpMatrix3 *matrix2); +void gimp_matrix3_translate (GimpMatrix3 *matrix, + gdouble x, + gdouble y); +void gimp_matrix3_scale (GimpMatrix3 *matrix, + gdouble x, + gdouble y); +void gimp_matrix3_rotate (GimpMatrix3 *matrix, + gdouble theta); +void gimp_matrix3_xshear (GimpMatrix3 *matrix, + gdouble amount); +void gimp_matrix3_yshear (GimpMatrix3 *matrix, + gdouble amount); +void gimp_matrix3_affine (GimpMatrix3 *matrix, + gdouble a, + gdouble b, + gdouble c, + gdouble d, + gdouble e, + gdouble f); + +gdouble gimp_matrix3_determinant (const GimpMatrix3 *matrix); +void gimp_matrix3_invert (GimpMatrix3 *matrix); + +gboolean gimp_matrix3_is_identity (const GimpMatrix3 *matrix); +gboolean gimp_matrix3_is_diagonal (const GimpMatrix3 *matrix); +gboolean gimp_matrix3_is_affine (const GimpMatrix3 *matrix); +gboolean gimp_matrix3_is_simple (const GimpMatrix3 *matrix); + +gboolean gimp_matrix3_equal (const GimpMatrix3 *matrix1, + const GimpMatrix3 *matrix2); + +void gimp_matrix3_transform_point (const GimpMatrix3 *matrix, + gdouble x, + gdouble y, + gdouble *newx, + gdouble *newy); + + +/*****************/ +/* GimpMatrix4 */ +/*****************/ + +void gimp_matrix4_identity (GimpMatrix4 *matrix); +void gimp_matrix4_mult (const GimpMatrix4 *matrix1, + GimpMatrix4 *matrix2); + +void gimp_matrix4_to_deg (const GimpMatrix4 *matrix, + gdouble *a, + gdouble *b, + gdouble *c); + +gdouble gimp_matrix4_transform_point (const GimpMatrix4 *matrix, + gdouble x, + gdouble y, + gdouble z, + gdouble *newx, + gdouble *newy, + gdouble *newz); + + +G_END_DECLS + +#endif /* __GIMP_MATRIX_H__ */ diff --git a/libgimpmath/gimpmd5.c b/libgimpmath/gimpmd5.c new file mode 100644 index 0000000..712c3a9 --- /dev/null +++ b/libgimpmath/gimpmd5.c @@ -0,0 +1,53 @@ +/* LIBGIMP - The GIMP Library + * + * gimpmd5.c + * + * Use of this code is deprecated! Use %GChecksum from GLib instead. + */ + +#include "config.h" + +#include <glib-object.h> + +#include "gimpmathtypes.h" + +#include "gimpmd5.h" + + +/** + * SECTION: gimpmd5 + * @title: GimpMD5 + * @short_description: The MD5 message-digest algorithm + * + * The MD5 message-digest algorithm + **/ + + +/** + * gimp_md5_get_digest: + * @buffer: byte buffer + * @buffer_size: buffer size (in bytes) or -1 if @buffer is nul-terminated. + * @digest: 16 bytes buffer receiving the hash code. + * + * This function is deprecated! Use %GChecksum from GLib instead. + * + * Get the md5 hash of a buffer. The result is put in the 16 bytes + * buffer @digest. For more information see RFC 1321. + **/ +void +gimp_md5_get_digest (const gchar *buffer, + gint buffer_size, + guchar digest[16]) +{ + GChecksum *checksum; + gsize len = 16; + + g_return_if_fail (buffer != NULL); + g_return_if_fail (digest != NULL); + + checksum = g_checksum_new (G_CHECKSUM_MD5); + + g_checksum_update (checksum, (const guchar *) buffer, buffer_size); + g_checksum_get_digest (checksum, digest, &len); + g_checksum_free (checksum); +} diff --git a/libgimpmath/gimpmd5.h b/libgimpmath/gimpmd5.h new file mode 100644 index 0000000..1e04e91 --- /dev/null +++ b/libgimpmath/gimpmd5.h @@ -0,0 +1,26 @@ +/* LIBGIMP - The GIMP Library + * + * gimpmd5.h + * + * Use of this code is deprecated! Use %GChecksum from GLib instead. + */ + +#if !defined (__GIMP_MATH_H_INSIDE__) && !defined (GIMP_MATH_COMPILATION) +#error "Only <libgimpmath/gimpmath.h> can be included directly." +#endif + +#ifndef __GIMP_MD5_H__ +#define __GIMP_MD5_H__ + +G_BEGIN_DECLS + +/* For information look into the C source or the html documentation */ + +GIMP_DEPRECATED_FOR(GChecksum) +void gimp_md5_get_digest (const gchar *buffer, + gint buffer_size, + guchar digest[16]); + +G_END_DECLS + +#endif /* __GIMP_MD5_H__ */ diff --git a/libgimpmath/gimpvector.c b/libgimpmath/gimpvector.c new file mode 100644 index 0000000..5f2b174 --- /dev/null +++ b/libgimpmath/gimpvector.c @@ -0,0 +1,1129 @@ +/* LIBGIMP - The GIMP Library + * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball + * + * gimpvector.c + * + * The gimp_vector* functions were taken from: + * GCK - The General Convenience Kit + * Copyright (C) 1996 Tom Bech + * + * This library is free software: you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 3 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library. If not, see + * <https://www.gnu.org/licenses/>. + */ + +/**********************************************/ +/* A little collection of useful vector stuff */ +/**********************************************/ + +#include "config.h" + +#include <glib-object.h> + +#include "gimpmath.h" + + +/** + * SECTION: gimpvector + * @title: GimpVector + * @short_description: Utilities to set up and manipulate vectors. + * @see_also: #GimpMatrix2, #GimpMatrix3, #GimpMatrix4 + * + * Utilities to set up and manipulate vectors. + **/ + + +/*************************/ +/* Some useful constants */ +/*************************/ + +static const GimpVector2 gimp_vector2_zero = { 0.0, 0.0 }; +#if 0 +static const GimpVector2 gimp_vector2_unit_x = { 1.0, 0.0 }; +static const GimpVector2 gimp_vector2_unit_y = { 0.0, 1.0 }; +#endif + +static const GimpVector3 gimp_vector3_zero = { 0.0, 0.0, 0.0 }; +#if 0 +static const GimpVector3 gimp_vector3_unit_x = { 1.0, 0.0, 0.0 }; +static const GimpVector3 gimp_vector3_unit_y = { 0.0, 1.0, 0.0 }; +static const GimpVector3 gimp_vector3_unit_z = { 0.0, 0.0, 1.0 }; +#endif + +/**************************************/ +/* Two dimensional vector functions */ +/**************************************/ + +/** + * gimp_vector2_new: + * @x: the X coordinate. + * @y: the Y coordinate. + * + * Creates a #GimpVector2 of coordinates @x and @y. + * + * Returns: the resulting #GimpVector2. + **/ +GimpVector2 +gimp_vector2_new (gdouble x, + gdouble y) +{ + GimpVector2 vector; + + vector.x = x; + vector.y = y; + + return vector; +} + +/** + * gimp_vector2_set: + * @vector: a pointer to a #GimpVector2. + * @x: the X coordinate. + * @y: the Y coordinate. + * + * Sets the X and Y coordinates of @vector to @x and @y. + **/ +void +gimp_vector2_set (GimpVector2 *vector, + gdouble x, + gdouble y) +{ + vector->x = x; + vector->y = y; +} + +/** + * gimp_vector2_length: + * @vector: a pointer to a #GimpVector2. + * + * Computes the length of a 2D vector. + * + * Returns: the length of @vector (a positive gdouble). + **/ +gdouble +gimp_vector2_length (const GimpVector2 *vector) +{ + return (sqrt (vector->x * vector->x + vector->y * vector->y)); +} + +/** + * gimp_vector2_length_val: + * @vector: a #GimpVector2. + * + * This function is identical to gimp_vector2_length() but the + * vector is passed by value rather than by reference. + * + * Returns: the length of @vector (a positive gdouble). + **/ +gdouble +gimp_vector2_length_val (GimpVector2 vector) +{ + return (sqrt (vector.x * vector.x + vector.y * vector.y)); +} + +/** + * gimp_vector2_mul: + * @vector: a pointer to a #GimpVector2. + * @factor: a scalar. + * + * Multiplies each component of the @vector by @factor. Note that this + * is equivalent to multiplying the vectors length by @factor. + **/ +void +gimp_vector2_mul (GimpVector2 *vector, + gdouble factor) +{ + vector->x *= factor; + vector->y *= factor; +} + +/** + * gimp_vector2_mul_val: + * @vector: a #GimpVector2. + * @factor: a scalar. + * + * This function is identical to gimp_vector2_mul() but the vector is + * passed by value rather than by reference. + * + * Returns: the resulting #GimpVector2. + **/ +GimpVector2 +gimp_vector2_mul_val (GimpVector2 vector, + gdouble factor) +{ + GimpVector2 result; + + result.x = vector.x * factor; + result.y = vector.y * factor; + + return result; +} + + +/** + * gimp_vector2_normalize: + * @vector: a pointer to a #GimpVector2. + * + * Normalizes the @vector so the length of the @vector is 1.0. The nul + * vector will not be changed. + **/ +void +gimp_vector2_normalize (GimpVector2 *vector) +{ + gdouble len; + + len = gimp_vector2_length (vector); + + if (len != 0.0) + { + len = 1.0 / len; + vector->x *= len; + vector->y *= len; + } + else + { + *vector = gimp_vector2_zero; + } +} + +/** + * gimp_vector2_normalize_val: + * @vector: a #GimpVector2. + * + * This function is identical to gimp_vector2_normalize() but the + * vector is passed by value rather than by reference. + * + * Returns: a #GimpVector2 parallel to @vector, pointing in the same + * direction but with a length of 1.0. + **/ +GimpVector2 +gimp_vector2_normalize_val (GimpVector2 vector) +{ + GimpVector2 normalized; + gdouble len; + + len = gimp_vector2_length_val (vector); + + if (len != 0.0) + { + len = 1.0 / len; + normalized.x = vector.x * len; + normalized.y = vector.y * len; + return normalized; + } + else + { + return gimp_vector2_zero; + } +} + +/** + * gimp_vector2_neg: + * @vector: a pointer to a #GimpVector2. + * + * Negates the @vector (i.e. negate all its coordinates). + **/ +void +gimp_vector2_neg (GimpVector2 *vector) +{ + vector->x *= -1.0; + vector->y *= -1.0; +} + +/** + * gimp_vector2_neg_val: + * @vector: a #GimpVector2. + * + * This function is identical to gimp_vector2_neg() but the vector + * is passed by value rather than by reference. + * + * Returns: the negated #GimpVector2. + **/ +GimpVector2 +gimp_vector2_neg_val (GimpVector2 vector) +{ + GimpVector2 result; + + result.x = vector.x * -1.0; + result.y = vector.y * -1.0; + + return result; +} + +/** + * gimp_vector2_add: + * @result: destination for the resulting #GimpVector2. + * @vector1: a pointer to the first #GimpVector2. + * @vector2: a pointer to the second #GimpVector2. + * + * Computes the sum of two 2D vectors. The resulting #GimpVector2 is + * stored in @result. + **/ +void +gimp_vector2_add (GimpVector2 *result, + const GimpVector2 *vector1, + const GimpVector2 *vector2) +{ + result->x = vector1->x + vector2->x; + result->y = vector1->y + vector2->y; +} + +/** + * gimp_vector2_add_val: + * @vector1: the first #GimpVector2. + * @vector2: the second #GimpVector2. + * + * This function is identical to gimp_vector2_add() but the vectors + * are passed by value rather than by reference. + * + * Returns: the resulting #GimpVector2. + **/ +GimpVector2 +gimp_vector2_add_val (GimpVector2 vector1, + GimpVector2 vector2) +{ + GimpVector2 result; + + result.x = vector1.x + vector2.x; + result.y = vector1.y + vector2.y; + + return result; +} + +/** + * gimp_vector2_sub: + * @result: the destination for the resulting #GimpVector2. + * @vector1: a pointer to the first #GimpVector2. + * @vector2: a pointer to the second #GimpVector2. + * + * Computes the difference of two 2D vectors (@vector1 minus @vector2). + * The resulting #GimpVector2 is stored in @result. + **/ +void +gimp_vector2_sub (GimpVector2 *result, + const GimpVector2 *vector1, + const GimpVector2 *vector2) +{ + result->x = vector1->x - vector2->x; + result->y = vector1->y - vector2->y; +} + +/** + * gimp_vector2_sub_val: + * @vector1: the first #GimpVector2. + * @vector2: the second #GimpVector2. + * + * This function is identical to gimp_vector2_sub() but the vectors + * are passed by value rather than by reference. + * + * Returns: the resulting #GimpVector2. + **/ +GimpVector2 +gimp_vector2_sub_val (GimpVector2 vector1, + GimpVector2 vector2) +{ + GimpVector2 result; + + result.x = vector1.x - vector2.x; + result.y = vector1.y - vector2.y; + + return result; +} + +/** + * gimp_vector2_inner_product: + * @vector1: a pointer to the first #GimpVector2. + * @vector2: a pointer to the second #GimpVector2. + * + * Computes the inner (dot) product of two 2D vectors. + * This product is zero if and only if the two vectors are orthogonal. + * + * Returns: The inner product. + **/ +gdouble +gimp_vector2_inner_product (const GimpVector2 *vector1, + const GimpVector2 *vector2) +{ + return (vector1->x * vector2->x + vector1->y * vector2->y); +} + +/** + * gimp_vector2_inner_product_val: + * @vector1: the first #GimpVector2. + * @vector2: the second #GimpVector2. + * + * This function is identical to gimp_vector2_inner_product() but the + * vectors are passed by value rather than by reference. + * + * Returns: The inner product. + **/ +gdouble +gimp_vector2_inner_product_val (GimpVector2 vector1, + GimpVector2 vector2) +{ + return (vector1.x * vector2.x + vector1.y * vector2.y); +} + +/** + * gimp_vector2_cross_product: + * @vector1: a pointer to the first #GimpVector2. + * @vector2: a pointer to the second #GimpVector2. + * + * Compute the cross product of two vectors. The result is a + * #GimpVector2 which is orthogonal to both @vector1 and @vector2. If + * @vector1 and @vector2 are parallel, the result will be the nul + * vector. + * + * Note that in 2D, this function is useful to test if two vectors are + * parallel or not, or to compute the area spawned by two vectors. + * + * Returns: The cross product. + **/ +GimpVector2 +gimp_vector2_cross_product (const GimpVector2 *vector1, + const GimpVector2 *vector2) +{ + GimpVector2 normal; + + normal.x = vector1->x * vector2->y - vector1->y * vector2->x; + normal.y = vector1->y * vector2->x - vector1->x * vector2->y; + + return normal; +} + +/** + * gimp_vector2_cross_product_val: + * @vector1: the first #GimpVector2. + * @vector2: the second #GimpVector2. + * + * This function is identical to gimp_vector2_cross_product() but the + * vectors are passed by value rather than by reference. + * + * Returns: The cross product. + **/ +GimpVector2 +gimp_vector2_cross_product_val (GimpVector2 vector1, + GimpVector2 vector2) +{ + GimpVector2 normal; + + normal.x = vector1.x * vector2.y - vector1.y * vector2.x; + normal.y = vector1.y * vector2.x - vector1.x * vector2.y; + + return normal; +} + +/** + * gimp_vector2_rotate: + * @vector: a pointer to a #GimpVector2. + * @alpha: an angle (in radians). + * + * Rotates the @vector counterclockwise by @alpha radians. + **/ +void +gimp_vector2_rotate (GimpVector2 *vector, + gdouble alpha) +{ + GimpVector2 result; + + result.x = cos (alpha) * vector->x + sin (alpha) * vector->y; + result.y = cos (alpha) * vector->y - sin (alpha) * vector->x; + + *vector = result; +} + +/** + * gimp_vector2_rotate_val: + * @vector: a #GimpVector2. + * @alpha: an angle (in radians). + * + * This function is identical to gimp_vector2_rotate() but the vector + * is passed by value rather than by reference. + * + * Returns: a #GimpVector2 representing @vector rotated by @alpha + * radians. + **/ +GimpVector2 +gimp_vector2_rotate_val (GimpVector2 vector, + gdouble alpha) +{ + GimpVector2 result; + + result.x = cos (alpha) * vector.x + sin (alpha) * vector.y; + result.y = cos (alpha) * vector.y - sin (alpha) * vector.x; + + return result; +} + +/** + * gimp_vector2_normal: + * @vector: a pointer to a #GimpVector2. + * + * Compute a normalized perpendicular vector to @vector + * + * Returns: a #GimpVector2 perpendicular to @vector, with a length of 1.0. + * + * Since: 2.8 + **/ +GimpVector2 +gimp_vector2_normal (GimpVector2 *vector) +{ + GimpVector2 result; + + result.x = - vector->y; + result.y = vector->x; + + gimp_vector2_normalize (&result); + + return result; +} + +/** + * gimp_vector2_normal_val: + * @vector: a #GimpVector2. + * + * This function is identical to gimp_vector2_normal() but the vector + * is passed by value rather than by reference. + * + * Returns: a #GimpVector2 perpendicular to @vector, with a length of 1.0. + * + * Since: 2.8 + **/ +GimpVector2 +gimp_vector2_normal_val (GimpVector2 vector) +{ + GimpVector2 result; + + result.x = - vector.y; + result.y = vector.x; + + gimp_vector2_normalize (&result); + + return result; +} +/**************************************/ +/* Three dimensional vector functions */ +/**************************************/ + +/** + * gimp_vector3_new: + * @x: the X coordinate. + * @y: the Y coordinate. + * @z: the Z coordinate. + * + * Creates a #GimpVector3 of coordinate @x, @y and @z. + * + * Returns: the resulting #GimpVector3. + **/ +GimpVector3 +gimp_vector3_new (gdouble x, + gdouble y, + gdouble z) +{ + GimpVector3 vector; + + vector.x = x; + vector.y = y; + vector.z = z; + + return vector; +} + +/** + * gimp_vector3_set: + * @vector: a pointer to a #GimpVector3. + * @x: the X coordinate. + * @y: the Y coordinate. + * @z: the Z coordinate. + * + * Sets the X, Y and Z coordinates of @vector to @x, @y and @z. + **/ +void +gimp_vector3_set (GimpVector3 *vector, + gdouble x, + gdouble y, + gdouble z) +{ + vector->x = x; + vector->y = y; + vector->z = z; +} + +/** + * gimp_vector3_length: + * @vector: a pointer to a #GimpVector3. + * + * Computes the length of a 3D vector. + * + * Returns: the length of @vector (a positive gdouble). + **/ +gdouble +gimp_vector3_length (const GimpVector3 *vector) +{ + return (sqrt (vector->x * vector->x + + vector->y * vector->y + + vector->z * vector->z)); +} + +/** + * gimp_vector3_length_val: + * @vector: a #GimpVector3. + * + * This function is identical to gimp_vector3_length() but the vector + * is passed by value rather than by reference. + * + * Returns: the length of @vector (a positive gdouble). + **/ +gdouble +gimp_vector3_length_val (GimpVector3 vector) +{ + return (sqrt (vector.x * vector.x + + vector.y * vector.y + + vector.z * vector.z)); +} + +/** + * gimp_vector3_mul: + * @vector: a pointer to a #GimpVector3. + * @factor: a scalar. + * + * Multiplies each component of the @vector by @factor. Note that + * this is equivalent to multiplying the vectors length by @factor. + **/ +void +gimp_vector3_mul (GimpVector3 *vector, + gdouble factor) +{ + vector->x *= factor; + vector->y *= factor; + vector->z *= factor; +} + +/** + * gimp_vector3_mul_val: + * @vector: a #GimpVector3. + * @factor: a scalar. + * + * This function is identical to gimp_vector3_mul() but the vector is + * passed by value rather than by reference. + * + * Returns: the resulting #GimpVector3. + **/ +GimpVector3 +gimp_vector3_mul_val (GimpVector3 vector, + gdouble factor) +{ + GimpVector3 result; + + result.x = vector.x * factor; + result.y = vector.y * factor; + result.z = vector.z * factor; + + return result; +} + +/** + * gimp_vector3_normalize: + * @vector: a pointer to a #GimpVector3. + * + * Normalizes the @vector so the length of the @vector is 1.0. The nul + * vector will not be changed. + **/ +void +gimp_vector3_normalize (GimpVector3 *vector) +{ + gdouble len; + + len = gimp_vector3_length (vector); + + if (len != 0.0) + { + len = 1.0 / len; + vector->x *= len; + vector->y *= len; + vector->z *= len; + } + else + { + *vector = gimp_vector3_zero; + } +} + +/** + * gimp_vector3_normalize_val: + * @vector: a #GimpVector3. + * + * This function is identical to gimp_vector3_normalize() but the + * vector is passed by value rather than by reference. + * + * Returns: a #GimpVector3 parallel to @vector, pointing in the same + * direction but with a length of 1.0. + **/ +GimpVector3 +gimp_vector3_normalize_val (GimpVector3 vector) +{ + GimpVector3 result; + gdouble len; + + len = gimp_vector3_length_val (vector); + + if (len != 0.0) + { + len = 1.0 / len; + result.x = vector.x * len; + result.y = vector.y * len; + result.z = vector.z * len; + return result; + } + else + { + return gimp_vector3_zero; + } +} + +/** + * gimp_vector3_neg: + * @vector: a pointer to a #GimpVector3. + * + * Negates the @vector (i.e. negate all its coordinates). + **/ +void +gimp_vector3_neg (GimpVector3 *vector) +{ + vector->x *= -1.0; + vector->y *= -1.0; + vector->z *= -1.0; +} + +/** + * gimp_vector3_neg_val: + * @vector: a #GimpVector3. + * + * This function is identical to gimp_vector3_neg() but the vector + * is passed by value rather than by reference. + * + * Returns: the negated #GimpVector3. + **/ +GimpVector3 +gimp_vector3_neg_val (GimpVector3 vector) +{ + GimpVector3 result; + + result.x = vector.x * -1.0; + result.y = vector.y * -1.0; + result.z = vector.z * -1.0; + + return result; +} + +/** + * gimp_vector3_add: + * @result: destination for the resulting #GimpVector3. + * @vector1: a pointer to the first #GimpVector3. + * @vector2: a pointer to the second #GimpVector3. + * + * Computes the sum of two 3D vectors. The resulting #GimpVector3 is + * stored in @result. + **/ +void +gimp_vector3_add (GimpVector3 *result, + const GimpVector3 *vector1, + const GimpVector3 *vector2) +{ + result->x = vector1->x + vector2->x; + result->y = vector1->y + vector2->y; + result->z = vector1->z + vector2->z; +} + +/** + * gimp_vector3_add_val: + * @vector1: a #GimpVector3. + * @vector2: a #GimpVector3. + * + * This function is identical to gimp_vector3_add() but the vectors + * are passed by value rather than by reference. + * + * Returns: the resulting #GimpVector3. + **/ +GimpVector3 +gimp_vector3_add_val (GimpVector3 vector1, + GimpVector3 vector2) +{ + GimpVector3 result; + + result.x = vector1.x + vector2.x; + result.y = vector1.y + vector2.y; + result.z = vector1.z + vector2.z; + + return result; +} + +/** + * gimp_vector3_sub: + * @result: the destination for the resulting #GimpVector3. + * @vector1: a pointer to the first #GimpVector3. + * @vector2: a pointer to the second #GimpVector3. + * + * Computes the difference of two 3D vectors (@vector1 minus @vector2). + * The resulting #GimpVector3 is stored in @result. + **/ +void +gimp_vector3_sub (GimpVector3 *result, + const GimpVector3 *vector1, + const GimpVector3 *vector2) +{ + result->x = vector1->x - vector2->x; + result->y = vector1->y - vector2->y; + result->z = vector1->z - vector2->z; +} + +/** + * gimp_vector3_sub_val: + * @vector1: a #GimpVector3. + * @vector2: a #GimpVector3. + * + * This function is identical to gimp_vector3_sub() but the vectors + * are passed by value rather than by reference. + * + * Returns: the resulting #GimpVector3. + **/ +GimpVector3 +gimp_vector3_sub_val (GimpVector3 vector1, + GimpVector3 vector2) +{ + GimpVector3 result; + + result.x = vector1.x - vector2.x; + result.y = vector1.y - vector2.y; + result.z = vector1.z - vector2.z; + + return result; +} + +/** + * gimp_vector3_inner_product: + * @vector1: a pointer to the first #GimpVector3. + * @vector2: a pointer to the second #GimpVector3. + * + * Computes the inner (dot) product of two 3D vectors. This product + * is zero if and only if the two vectors are orthogonal. + * + * Returns: The inner product. + **/ +gdouble +gimp_vector3_inner_product (const GimpVector3 *vector1, + const GimpVector3 *vector2) +{ + return (vector1->x * vector2->x + + vector1->y * vector2->y + + vector1->z * vector2->z); +} + +/** + * gimp_vector3_inner_product_val: + * @vector1: the first #GimpVector3. + * @vector2: the second #GimpVector3. + * + * This function is identical to gimp_vector3_inner_product() but the + * vectors are passed by value rather than by reference. + * + * Returns: The inner product. + **/ +gdouble +gimp_vector3_inner_product_val (GimpVector3 vector1, + GimpVector3 vector2) +{ + return (vector1.x * vector2.x + + vector1.y * vector2.y + + vector1.z * vector2.z); +} + +/** + * gimp_vector3_cross_product: + * @vector1: a pointer to the first #GimpVector3. + * @vector2: a pointer to the second #GimpVector3. + * + * Compute the cross product of two vectors. The result is a + * #GimpVector3 which is orthogonal to both @vector1 and @vector2. If + * @vector1 and @vector2 and parallel, the result will be the nul + * vector. + * + * This function can be used to compute the normal of the plane + * defined by @vector1 and @vector2. + * + * Returns: The cross product. + **/ +GimpVector3 +gimp_vector3_cross_product (const GimpVector3 *vector1, + const GimpVector3 *vector2) +{ + GimpVector3 normal; + + normal.x = vector1->y * vector2->z - vector1->z * vector2->y; + normal.y = vector1->z * vector2->x - vector1->x * vector2->z; + normal.z = vector1->x * vector2->y - vector1->y * vector2->x; + + return normal; +} + +/** + * gimp_vector3_cross_product_val: + * @vector1: the first #GimpVector3. + * @vector2: the second #GimpVector3. + * + * This function is identical to gimp_vector3_cross_product() but the + * vectors are passed by value rather than by reference. + * + * Returns: The cross product. + **/ +GimpVector3 +gimp_vector3_cross_product_val (GimpVector3 vector1, + GimpVector3 vector2) +{ + GimpVector3 normal; + + normal.x = vector1.y * vector2.z - vector1.z * vector2.y; + normal.y = vector1.z * vector2.x - vector1.x * vector2.z; + normal.z = vector1.x * vector2.y - vector1.y * vector2.x; + + return normal; +} + +/** + * gimp_vector3_rotate: + * @vector: a pointer to a #GimpVector3. + * @alpha: the angle (in radian) of rotation around the Z axis. + * @beta: the angle (in radian) of rotation around the Y axis. + * @gamma: the angle (in radian) of rotation around the X axis. + * + * Rotates the @vector around the three axis (Z, Y, and X) by @alpha, + * @beta and @gamma, respectively. + * + * Note that the order of the rotation is very important. If you + * expect a vector to be rotated around X, and then around Y, you will + * have to call this function twice. Also, it is often wise to call + * this function with only one of @alpha, @beta and @gamma non-zero. + **/ +void +gimp_vector3_rotate (GimpVector3 *vector, + gdouble alpha, + gdouble beta, + gdouble gamma) +{ + GimpVector3 s, t; + + /* First we rotate it around the Z axis (XY plane).. */ + /* ================================================= */ + + s.x = cos (alpha) * vector->x + sin (alpha) * vector->y; + s.y = cos (alpha) * vector->y - sin (alpha) * vector->x; + + /* ..then around the Y axis (XZ plane).. */ + /* ===================================== */ + + t = s; + + vector->x = cos (beta) *t.x + sin (beta) * vector->z; + s.z = cos (beta) *vector->z - sin (beta) * t.x; + + /* ..and at last around the X axis (YZ plane) */ + /* ========================================== */ + + vector->y = cos (gamma) * t.y + sin (gamma) * s.z; + vector->z = cos (gamma) * s.z - sin (gamma) * t.y; +} + +/** + * gimp_vector3_rotate_val: + * @vector: a #GimpVector3. + * @alpha: the angle (in radian) of rotation around the Z axis. + * @beta: the angle (in radian) of rotation around the Y axis. + * @gamma: the angle (in radian) of rotation around the X axis. + * + * This function is identical to gimp_vector3_rotate() but the vectors + * are passed by value rather than by reference. + * + * Returns: the rotated vector. + **/ +GimpVector3 +gimp_vector3_rotate_val (GimpVector3 vector, + gdouble alpha, + gdouble beta, + gdouble gamma) +{ + GimpVector3 s, t, result; + + /* First we rotate it around the Z axis (XY plane).. */ + /* ================================================= */ + + s.x = cos (alpha) * vector.x + sin (alpha) * vector.y; + s.y = cos (alpha) * vector.y - sin (alpha) * vector.x; + + /* ..then around the Y axis (XZ plane).. */ + /* ===================================== */ + + t = s; + + result.x = cos (beta) *t.x + sin (beta) * vector.z; + s.z = cos (beta) *vector.z - sin (beta) * t.x; + + /* ..and at last around the X axis (YZ plane) */ + /* ========================================== */ + + result.y = cos (gamma) * t.y + sin (gamma) * s.z; + result.z = cos (gamma) * s.z - sin (gamma) * t.y; + + return result; +} + +/** + * gimp_vector_2d_to_3d: + * @sx: the abscissa of the upper-left screen rectangle. + * @sy: the ordinate of the upper-left screen rectangle. + * @w: the width of the screen rectangle. + * @h: the height of the screen rectangle. + * @x: the abscissa of the point in the screen rectangle to map. + * @y: the ordinate of the point in the screen rectangle to map. + * @vp: the position of the observer. + * @p: the resulting point. + * + * \"Compute screen (sx, sy) - (sx + w, sy + h) to 3D unit square + * mapping. The plane to map to is given in the z field of p. The + * observer is located at position vp (vp->z != 0.0).\" + * + * In other words, this computes the projection of the point (@x, @y) + * to the plane z = @p->z (parallel to XY), from the @vp point of view + * through the screen (@sx, @sy)->(@sx + @w, @sy + @h) + **/ + +void +gimp_vector_2d_to_3d (gint sx, + gint sy, + gint w, + gint h, + gint x, + gint y, + const GimpVector3 *vp, + GimpVector3 *p) +{ + gdouble t = 0.0; + + if (vp->x != 0.0) + t = (p->z - vp->z) / vp->z; + + if (t != 0.0) + { + p->x = vp->x + t * (vp->x - ((gdouble) (x - sx) / (gdouble) w)); + p->y = vp->y + t * (vp->y - ((gdouble) (y - sy) / (gdouble) h)); + } + else + { + p->x = (gdouble) (x - sx) / (gdouble) w; + p->y = (gdouble) (y - sy) / (gdouble) h; + } +} + +/** + * gimp_vector_2d_to_3d_val: + * @sx: the abscissa of the upper-left screen rectangle. + * @sy: the ordinate of the upper-left screen rectangle. + * @w: the width of the screen rectangle. + * @h: the height of the screen rectangle. + * @x: the abscissa of the point in the screen rectangle to map. + * @y: the ordinate of the point in the screen rectangle to map. + * @vp: position of the observer. + * @p: the resulting point. + * + * This function is identical to gimp_vector_2d_to_3d() but the + * position of the @observer and the resulting point @p are passed by + * value rather than by reference. + * + * Returns: the computed #GimpVector3 point. + **/ +GimpVector3 +gimp_vector_2d_to_3d_val (gint sx, + gint sy, + gint w, + gint h, + gint x, + gint y, + GimpVector3 vp, + GimpVector3 p) +{ + GimpVector3 result; + gdouble t = 0.0; + + if (vp.x != 0.0) + t = (p.z - vp.z) / vp.z; + + if (t != 0.0) + { + result.x = vp.x + t * (vp.x - ((gdouble) (x - sx) / (gdouble) w)); + result.y = vp.y + t * (vp.y - ((gdouble) (y - sy) / (gdouble) h)); + } + else + { + result.x = (gdouble) (x - sx) / (gdouble) w; + result.y = (gdouble) (y - sy) / (gdouble) h; + } + + result.z = 0; + return result; +} + +/** + * gimp_vector_3d_to_2d: + * @sx: the abscissa of the upper-left screen rectangle. + * @sy: the ordinate of the upper-left screen rectangle. + * @w: the width of the screen rectangle. + * @h: the height of the screen rectangle. + * @x: the abscissa of the point in the screen rectangle to map (return value). + * @y: the ordinate of the point in the screen rectangle to map (return value). + * @vp: position of the observer. + * @p: the 3D point to project to the plane. + * + * Convert the given 3D point to 2D (project it onto the viewing + * plane, (sx, sy, 0) - (sx + w, sy + h, 0). The input is assumed to + * be in the unit square (0, 0, z) - (1, 1, z). The viewpoint of the + * observer is passed in vp. + * + * This is basically the opposite of gimp_vector_2d_to_3d(). + **/ +void +gimp_vector_3d_to_2d (gint sx, + gint sy, + gint w, + gint h, + gdouble *x, + gdouble *y, + const GimpVector3 *vp, + const GimpVector3 *p) +{ + gdouble t; + GimpVector3 dir; + + gimp_vector3_sub (&dir, p, vp); + gimp_vector3_normalize (&dir); + + if (dir.z != 0.0) + { + t = (-1.0 * vp->z) / dir.z; + *x = (gdouble) sx + ((vp->x + t * dir.x) * (gdouble) w); + *y = (gdouble) sy + ((vp->y + t * dir.y) * (gdouble) h); + } + else + { + *x = (gdouble) sx + (p->x * (gdouble) w); + *y = (gdouble) sy + (p->y * (gdouble) h); + } +} diff --git a/libgimpmath/gimpvector.h b/libgimpmath/gimpvector.h new file mode 100644 index 0000000..77230da --- /dev/null +++ b/libgimpmath/gimpvector.h @@ -0,0 +1,160 @@ +/* LIBGIMP - The GIMP Library + * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball + * + * gimpvector.h + * + * The gimp_vector* functions were taken from: + * GCK - The General Convenience Kit + * Copyright (C) 1996 Tom Bech + * + * This library is free software: you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 3 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library. If not, see + * <https://www.gnu.org/licenses/>. + */ + +#if !defined (__GIMP_MATH_H_INSIDE__) && !defined (GIMP_MATH_COMPILATION) +#error "Only <libgimpmath/gimpmath.h> can be included directly." +#endif + +#ifndef __GIMP_VECTOR_H__ +#define __GIMP_VECTOR_H__ + +G_BEGIN_DECLS + +/* For information look into the C source or the html documentation */ + + +/* Two dimensional vector functions */ +/* ================================ */ + +GimpVector2 gimp_vector2_new (gdouble x, + gdouble y); +void gimp_vector2_set (GimpVector2 *vector, + gdouble x, + gdouble y); +gdouble gimp_vector2_length (const GimpVector2 *vector); +gdouble gimp_vector2_length_val (GimpVector2 vector); +void gimp_vector2_mul (GimpVector2 *vector, + gdouble factor); +GimpVector2 gimp_vector2_mul_val (GimpVector2 vector, + gdouble factor); +void gimp_vector2_normalize (GimpVector2 *vector); +GimpVector2 gimp_vector2_normalize_val (GimpVector2 vector); +void gimp_vector2_neg (GimpVector2 *vector); +GimpVector2 gimp_vector2_neg_val (GimpVector2 vector); +void gimp_vector2_add (GimpVector2 *result, + const GimpVector2 *vector1, + const GimpVector2 *vector2); +GimpVector2 gimp_vector2_add_val (GimpVector2 vector1, + GimpVector2 vector2); +void gimp_vector2_sub (GimpVector2 *result, + const GimpVector2 *vector1, + const GimpVector2 *vector2); +GimpVector2 gimp_vector2_sub_val (GimpVector2 vector1, + GimpVector2 vector2); +gdouble gimp_vector2_inner_product (const GimpVector2 *vector1, + const GimpVector2 *vector2); +gdouble gimp_vector2_inner_product_val (GimpVector2 vector1, + GimpVector2 vector2); +GimpVector2 gimp_vector2_cross_product (const GimpVector2 *vector1, + const GimpVector2 *vector2); +GimpVector2 gimp_vector2_cross_product_val (GimpVector2 vector1, + GimpVector2 vector2); +void gimp_vector2_rotate (GimpVector2 *vector, + gdouble alpha); +GimpVector2 gimp_vector2_rotate_val (GimpVector2 vector, + gdouble alpha); +GimpVector2 gimp_vector2_normal (GimpVector2 *vector); +GimpVector2 gimp_vector2_normal_val (GimpVector2 vector); + +/* Three dimensional vector functions */ +/* ================================== */ + +GimpVector3 gimp_vector3_new (gdouble x, + gdouble y, + gdouble z); +void gimp_vector3_set (GimpVector3 *vector, + gdouble x, + gdouble y, + gdouble z); +gdouble gimp_vector3_length (const GimpVector3 *vector); +gdouble gimp_vector3_length_val (GimpVector3 vector); +void gimp_vector3_mul (GimpVector3 *vector, + gdouble factor); +GimpVector3 gimp_vector3_mul_val (GimpVector3 vector, + gdouble factor); +void gimp_vector3_normalize (GimpVector3 *vector); +GimpVector3 gimp_vector3_normalize_val (GimpVector3 vector); +void gimp_vector3_neg (GimpVector3 *vector); +GimpVector3 gimp_vector3_neg_val (GimpVector3 vector); +void gimp_vector3_add (GimpVector3 *result, + const GimpVector3 *vector1, + const GimpVector3 *vector2); +GimpVector3 gimp_vector3_add_val (GimpVector3 vector1, + GimpVector3 vector2); +void gimp_vector3_sub (GimpVector3 *result, + const GimpVector3 *vector1, + const GimpVector3 *vector2); +GimpVector3 gimp_vector3_sub_val (GimpVector3 vector1, + GimpVector3 vector2); +gdouble gimp_vector3_inner_product (const GimpVector3 *vector1, + const GimpVector3 *vector2); +gdouble gimp_vector3_inner_product_val (GimpVector3 vector1, + GimpVector3 vector2); +GimpVector3 gimp_vector3_cross_product (const GimpVector3 *vector1, + const GimpVector3 *vector2); +GimpVector3 gimp_vector3_cross_product_val (GimpVector3 vector1, + GimpVector3 vector2); +void gimp_vector3_rotate (GimpVector3 *vector, + gdouble alpha, + gdouble beta, + gdouble gamma); +GimpVector3 gimp_vector3_rotate_val (GimpVector3 vector, + gdouble alpha, + gdouble beta, + gdouble gamma); + +/* 2d <-> 3d Vector projection functions */ +/* ===================================== */ + +void gimp_vector_2d_to_3d (gint sx, + gint sy, + gint w, + gint h, + gint x, + gint y, + const GimpVector3 *vp, + GimpVector3 *p); + +GimpVector3 gimp_vector_2d_to_3d_val (gint sx, + gint sy, + gint w, + gint h, + gint x, + gint y, + GimpVector3 vp, + GimpVector3 p); + +void gimp_vector_3d_to_2d (gint sx, + gint sy, + gint w, + gint h, + gdouble *x, + gdouble *y, + const GimpVector3 *vp, + const GimpVector3 *p); + + +G_END_DECLS + +#endif /* __GIMP_VECTOR_H__ */ |