1 : /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2 : * ***** BEGIN LICENSE BLOCK *****
3 : * Version: MPL 1.1/GPL 2.0/LGPL 2.1
4 : *
5 : * The contents of this file are subject to the Mozilla Public License Version
6 : * 1.1 (the "License"); you may not use this file except in compliance with
7 : * the License. You may obtain a copy of the License at
8 : * http://www.mozilla.org/MPL/
9 : *
10 : * Software distributed under the License is distributed on an "AS IS" basis,
11 : * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
12 : * for the specific language governing rights and limitations under the
13 : * License.
14 : *
15 : * The Original Code is Oracle Corporation code.
16 : *
17 : * The Initial Developer of the Original Code is Oracle Corporation.
18 : * Portions created by the Initial Developer are Copyright (C) 2005
19 : * the Initial Developer. All Rights Reserved.
20 : *
21 : * Contributor(s):
22 : * Stuart Parmenter <pavlov@pavlov.net>
23 : *
24 : * Alternatively, the contents of this file may be used under the terms of
25 : * either the GNU General Public License Version 2 or later (the "GPL"), or
26 : * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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35 : *
36 : * ***** END LICENSE BLOCK ***** */
37 :
38 : #include "gfxMatrix.h"
39 : #include "cairo.h"
40 :
41 : #define CAIRO_MATRIX(x) reinterpret_cast<cairo_matrix_t*>((x))
42 : #define CONST_CAIRO_MATRIX(x) reinterpret_cast<const cairo_matrix_t*>((x))
43 :
44 : const gfxMatrix&
45 0 : gfxMatrix::Reset()
46 : {
47 0 : cairo_matrix_init_identity(CAIRO_MATRIX(this));
48 0 : return *this;
49 : }
50 :
51 : const gfxMatrix&
52 0 : gfxMatrix::Invert()
53 : {
54 0 : cairo_matrix_invert(CAIRO_MATRIX(this));
55 0 : return *this;
56 : }
57 :
58 : const gfxMatrix&
59 0 : gfxMatrix::Scale(gfxFloat x, gfxFloat y)
60 : {
61 0 : cairo_matrix_scale(CAIRO_MATRIX(this), x, y);
62 0 : return *this;
63 : }
64 :
65 : const gfxMatrix&
66 0 : gfxMatrix::Translate(const gfxPoint& pt)
67 : {
68 0 : cairo_matrix_translate(CAIRO_MATRIX(this), pt.x, pt.y);
69 0 : return *this;
70 : }
71 :
72 : const gfxMatrix&
73 0 : gfxMatrix::Rotate(gfxFloat radians)
74 : {
75 0 : cairo_matrix_rotate(CAIRO_MATRIX(this), radians);
76 0 : return *this;
77 : }
78 :
79 : const gfxMatrix&
80 0 : gfxMatrix::Multiply(const gfxMatrix& m)
81 : {
82 0 : cairo_matrix_multiply(CAIRO_MATRIX(this), CAIRO_MATRIX(this), CONST_CAIRO_MATRIX(&m));
83 0 : return *this;
84 : }
85 :
86 : const gfxMatrix&
87 0 : gfxMatrix::PreMultiply(const gfxMatrix& m)
88 : {
89 0 : cairo_matrix_multiply(CAIRO_MATRIX(this), CONST_CAIRO_MATRIX(&m), CAIRO_MATRIX(this));
90 0 : return *this;
91 : }
92 :
93 : gfxPoint
94 0 : gfxMatrix::Transform(const gfxPoint& point) const
95 : {
96 0 : gfxPoint ret = point;
97 0 : cairo_matrix_transform_point(CONST_CAIRO_MATRIX(this), &ret.x, &ret.y);
98 : return ret;
99 : }
100 :
101 : gfxSize
102 0 : gfxMatrix::Transform(const gfxSize& size) const
103 : {
104 0 : gfxSize ret = size;
105 0 : cairo_matrix_transform_distance(CONST_CAIRO_MATRIX(this), &ret.width, &ret.height);
106 : return ret;
107 : }
108 :
109 : gfxRect
110 0 : gfxMatrix::Transform(const gfxRect& rect) const
111 : {
112 0 : return gfxRect(Transform(rect.TopLeft()), Transform(rect.Size()));
113 : }
114 :
115 : gfxRect
116 0 : gfxMatrix::TransformBounds(const gfxRect& rect) const
117 : {
118 : /* Code taken from cairo-matrix.c, _cairo_matrix_transform_bounding_box isn't public */
119 : int i;
120 : double quad_x[4], quad_y[4];
121 : double min_x, max_x;
122 : double min_y, max_y;
123 :
124 0 : quad_x[0] = rect.X();
125 0 : quad_y[0] = rect.Y();
126 0 : cairo_matrix_transform_point (CONST_CAIRO_MATRIX(this), &quad_x[0], &quad_y[0]);
127 :
128 0 : quad_x[1] = rect.XMost();
129 0 : quad_y[1] = rect.Y();
130 0 : cairo_matrix_transform_point (CONST_CAIRO_MATRIX(this), &quad_x[1], &quad_y[1]);
131 :
132 0 : quad_x[2] = rect.X();
133 0 : quad_y[2] = rect.YMost();
134 0 : cairo_matrix_transform_point (CONST_CAIRO_MATRIX(this), &quad_x[2], &quad_y[2]);
135 :
136 0 : quad_x[3] = rect.XMost();
137 0 : quad_y[3] = rect.YMost();
138 0 : cairo_matrix_transform_point (CONST_CAIRO_MATRIX(this), &quad_x[3], &quad_y[3]);
139 :
140 0 : min_x = max_x = quad_x[0];
141 0 : min_y = max_y = quad_y[0];
142 :
143 0 : for (i = 1; i < 4; i++) {
144 0 : if (quad_x[i] < min_x)
145 0 : min_x = quad_x[i];
146 0 : if (quad_x[i] > max_x)
147 0 : max_x = quad_x[i];
148 :
149 0 : if (quad_y[i] < min_y)
150 0 : min_y = quad_y[i];
151 0 : if (quad_y[i] > max_y)
152 0 : max_y = quad_y[i];
153 : }
154 :
155 0 : return gfxRect(min_x, min_y, max_x - min_x, max_y - min_y);
156 : }
157 :
158 :
159 0 : static void NudgeToInteger(double *aVal)
160 : {
161 0 : float f = float(*aVal);
162 0 : float r = NS_roundf(f);
163 0 : if (f == r) {
164 0 : *aVal = r;
165 : }
166 0 : }
167 :
168 : void
169 0 : gfxMatrix::NudgeToIntegers(void)
170 : {
171 0 : NudgeToInteger(&xx);
172 0 : NudgeToInteger(&xy);
173 0 : NudgeToInteger(&yx);
174 0 : NudgeToInteger(&yy);
175 0 : NudgeToInteger(&x0);
176 0 : NudgeToInteger(&y0);
177 0 : }
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