summaryrefslogtreecommitdiffstats
path: root/gfx/thebes/gfxMatrix.cpp
blob: 25a4d5a6fb80a75f0f67d05092189873e0a75e50 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "gfxMatrix.h"
#include "cairo.h"
#include "mozilla/gfx/Tools.h"
#include "mozilla/gfx/Matrix.h" // for Matrix4x4

using namespace mozilla::gfx;

#define CAIRO_MATRIX(x) reinterpret_cast<cairo_matrix_t*>((x))
#define CONST_CAIRO_MATRIX(x) reinterpret_cast<const cairo_matrix_t*>((x))

const gfxMatrix&
gfxMatrix::Reset()
{
    cairo_matrix_init_identity(CAIRO_MATRIX(this));
    return *this;
}

bool
gfxMatrix::Invert()
{
    return cairo_matrix_invert(CAIRO_MATRIX(this)) == CAIRO_STATUS_SUCCESS;
}

gfxMatrix&
gfxMatrix::Scale(gfxFloat x, gfxFloat y)
{
    cairo_matrix_scale(CAIRO_MATRIX(this), x, y);
    return *this;
}

gfxMatrix&
gfxMatrix::Translate(const gfxPoint& pt)
{
    cairo_matrix_translate(CAIRO_MATRIX(this), pt.x, pt.y);
    return *this;
}

gfxMatrix&
gfxMatrix::Rotate(gfxFloat radians)
{
    cairo_matrix_rotate(CAIRO_MATRIX(this), radians);
    return *this;
}

const gfxMatrix&
gfxMatrix::operator *= (const gfxMatrix& m)
{
    cairo_matrix_multiply(CAIRO_MATRIX(this), CAIRO_MATRIX(this), CONST_CAIRO_MATRIX(&m));
    return *this;
}

gfxMatrix&
gfxMatrix::PreMultiply(const gfxMatrix& m)
{
    cairo_matrix_multiply(CAIRO_MATRIX(this), CONST_CAIRO_MATRIX(&m), CAIRO_MATRIX(this));
    return *this;
}

/* static */ gfxMatrix
gfxMatrix::Rotation(gfxFloat aAngle)
{
    gfxMatrix newMatrix;

    gfxFloat s = sin(aAngle);
    gfxFloat c = cos(aAngle);

    newMatrix._11 = c;
    newMatrix._12 = s;
    newMatrix._21 = -s;
    newMatrix._22 = c;

    return newMatrix;
}

gfxPoint
gfxMatrix::Transform(const gfxPoint& point) const
{
    gfxPoint ret = point;
    cairo_matrix_transform_point(CONST_CAIRO_MATRIX(this), &ret.x, &ret.y);
    return ret;
}

gfxSize
gfxMatrix::Transform(const gfxSize& size) const
{
    gfxSize ret = size;
    cairo_matrix_transform_distance(CONST_CAIRO_MATRIX(this), &ret.width, &ret.height);
    return ret;
}

gfxRect
gfxMatrix::Transform(const gfxRect& rect) const
{
    return gfxRect(Transform(rect.TopLeft()), Transform(rect.Size()));
}

gfxRect
gfxMatrix::TransformBounds(const gfxRect& rect) const
{
    /* Code taken from cairo-matrix.c, _cairo_matrix_transform_bounding_box isn't public */
    int i;
    double quad_x[4], quad_y[4];
    double min_x, max_x;
    double min_y, max_y;

    quad_x[0] = rect.X();
    quad_y[0] = rect.Y();
    cairo_matrix_transform_point (CONST_CAIRO_MATRIX(this), &quad_x[0], &quad_y[0]);

    quad_x[1] = rect.XMost();
    quad_y[1] = rect.Y();
    cairo_matrix_transform_point (CONST_CAIRO_MATRIX(this), &quad_x[1], &quad_y[1]);

    quad_x[2] = rect.X();
    quad_y[2] = rect.YMost();
    cairo_matrix_transform_point (CONST_CAIRO_MATRIX(this), &quad_x[2], &quad_y[2]);

    quad_x[3] = rect.XMost();
    quad_y[3] = rect.YMost();
    cairo_matrix_transform_point (CONST_CAIRO_MATRIX(this), &quad_x[3], &quad_y[3]);

    min_x = max_x = quad_x[0];
    min_y = max_y = quad_y[0];

    for (i = 1; i < 4; i++) {
        if (quad_x[i] < min_x)
            min_x = quad_x[i];
        if (quad_x[i] > max_x)
            max_x = quad_x[i];

        if (quad_y[i] < min_y)
            min_y = quad_y[i];
        if (quad_y[i] > max_y)
            max_y = quad_y[i];
    }

    return gfxRect(min_x, min_y, max_x - min_x, max_y - min_y);
}


static void NudgeToInteger(double *aVal)
{
    float f = float(*aVal);
    mozilla::gfx::NudgeToInteger(&f);
    *aVal = f;
}

gfxMatrix&
gfxMatrix::NudgeToIntegers(void)
{
    NudgeToInteger(&_11);
    NudgeToInteger(&_21);
    NudgeToInteger(&_12);
    NudgeToInteger(&_22);
    NudgeToInteger(&_31);
    NudgeToInteger(&_32);
    return *this;
}

mozilla::gfx::Matrix4x4
gfxMatrix::operator *(const mozilla::gfx::Matrix4x4& aMatrix) const
{
  Matrix4x4 resultMatrix;

  resultMatrix._11 = _11 * aMatrix._11 + _12 * aMatrix._21;
  resultMatrix._12 = _11 * aMatrix._12 + _12 * aMatrix._22;
  resultMatrix._13 = _11 * aMatrix._13 + _12 * aMatrix._23;
  resultMatrix._14 = _11 * aMatrix._14 + _12 * aMatrix._24;

  resultMatrix._21 = _21 * aMatrix._11 + _22 * aMatrix._21;
  resultMatrix._22 = _21 * aMatrix._12 + _22 * aMatrix._22;
  resultMatrix._23 = _21 * aMatrix._13 + _22 * aMatrix._23;
  resultMatrix._24 = _21 * aMatrix._14 + _22 * aMatrix._24;

  resultMatrix._31 = aMatrix._31;
  resultMatrix._32 = aMatrix._32;
  resultMatrix._33 = aMatrix._33;
  resultMatrix._34 = aMatrix._34;

  resultMatrix._41 = _31 * aMatrix._11 + _32 * aMatrix._21 + aMatrix._41;
  resultMatrix._42 = _31 * aMatrix._12 + _32 * aMatrix._22 + aMatrix._42;
  resultMatrix._43 = _31 * aMatrix._13 + _32 * aMatrix._23 + aMatrix._43;
  resultMatrix._44 = _31 * aMatrix._14 + _32 * aMatrix._24 + aMatrix._44;

  return resultMatrix;
}