1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/thebes/gfxMatrix.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,144 @@
1.4 +/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
1.5 + * This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#include "gfxMatrix.h"
1.10 +#include "cairo.h"
1.11 +#include "mozilla/gfx/Tools.h"
1.12 +
1.13 +#define CAIRO_MATRIX(x) reinterpret_cast<cairo_matrix_t*>((x))
1.14 +#define CONST_CAIRO_MATRIX(x) reinterpret_cast<const cairo_matrix_t*>((x))
1.15 +
1.16 +const gfxMatrix&
1.17 +gfxMatrix::Reset()
1.18 +{
1.19 + cairo_matrix_init_identity(CAIRO_MATRIX(this));
1.20 + return *this;
1.21 +}
1.22 +
1.23 +const gfxMatrix&
1.24 +gfxMatrix::Invert()
1.25 +{
1.26 + cairo_matrix_invert(CAIRO_MATRIX(this));
1.27 + return *this;
1.28 +}
1.29 +
1.30 +const gfxMatrix&
1.31 +gfxMatrix::Scale(gfxFloat x, gfxFloat y)
1.32 +{
1.33 + cairo_matrix_scale(CAIRO_MATRIX(this), x, y);
1.34 + return *this;
1.35 +}
1.36 +
1.37 +const gfxMatrix&
1.38 +gfxMatrix::Translate(const gfxPoint& pt)
1.39 +{
1.40 + cairo_matrix_translate(CAIRO_MATRIX(this), pt.x, pt.y);
1.41 + return *this;
1.42 +}
1.43 +
1.44 +const gfxMatrix&
1.45 +gfxMatrix::Rotate(gfxFloat radians)
1.46 +{
1.47 + cairo_matrix_rotate(CAIRO_MATRIX(this), radians);
1.48 + return *this;
1.49 +}
1.50 +
1.51 +const gfxMatrix&
1.52 +gfxMatrix::Multiply(const gfxMatrix& m)
1.53 +{
1.54 + cairo_matrix_multiply(CAIRO_MATRIX(this), CAIRO_MATRIX(this), CONST_CAIRO_MATRIX(&m));
1.55 + return *this;
1.56 +}
1.57 +
1.58 +const gfxMatrix&
1.59 +gfxMatrix::PreMultiply(const gfxMatrix& m)
1.60 +{
1.61 + cairo_matrix_multiply(CAIRO_MATRIX(this), CONST_CAIRO_MATRIX(&m), CAIRO_MATRIX(this));
1.62 + return *this;
1.63 +}
1.64 +
1.65 +gfxPoint
1.66 +gfxMatrix::Transform(const gfxPoint& point) const
1.67 +{
1.68 + gfxPoint ret = point;
1.69 + cairo_matrix_transform_point(CONST_CAIRO_MATRIX(this), &ret.x, &ret.y);
1.70 + return ret;
1.71 +}
1.72 +
1.73 +gfxSize
1.74 +gfxMatrix::Transform(const gfxSize& size) const
1.75 +{
1.76 + gfxSize ret = size;
1.77 + cairo_matrix_transform_distance(CONST_CAIRO_MATRIX(this), &ret.width, &ret.height);
1.78 + return ret;
1.79 +}
1.80 +
1.81 +gfxRect
1.82 +gfxMatrix::Transform(const gfxRect& rect) const
1.83 +{
1.84 + return gfxRect(Transform(rect.TopLeft()), Transform(rect.Size()));
1.85 +}
1.86 +
1.87 +gfxRect
1.88 +gfxMatrix::TransformBounds(const gfxRect& rect) const
1.89 +{
1.90 + /* Code taken from cairo-matrix.c, _cairo_matrix_transform_bounding_box isn't public */
1.91 + int i;
1.92 + double quad_x[4], quad_y[4];
1.93 + double min_x, max_x;
1.94 + double min_y, max_y;
1.95 +
1.96 + quad_x[0] = rect.X();
1.97 + quad_y[0] = rect.Y();
1.98 + cairo_matrix_transform_point (CONST_CAIRO_MATRIX(this), &quad_x[0], &quad_y[0]);
1.99 +
1.100 + quad_x[1] = rect.XMost();
1.101 + quad_y[1] = rect.Y();
1.102 + cairo_matrix_transform_point (CONST_CAIRO_MATRIX(this), &quad_x[1], &quad_y[1]);
1.103 +
1.104 + quad_x[2] = rect.X();
1.105 + quad_y[2] = rect.YMost();
1.106 + cairo_matrix_transform_point (CONST_CAIRO_MATRIX(this), &quad_x[2], &quad_y[2]);
1.107 +
1.108 + quad_x[3] = rect.XMost();
1.109 + quad_y[3] = rect.YMost();
1.110 + cairo_matrix_transform_point (CONST_CAIRO_MATRIX(this), &quad_x[3], &quad_y[3]);
1.111 +
1.112 + min_x = max_x = quad_x[0];
1.113 + min_y = max_y = quad_y[0];
1.114 +
1.115 + for (i = 1; i < 4; i++) {
1.116 + if (quad_x[i] < min_x)
1.117 + min_x = quad_x[i];
1.118 + if (quad_x[i] > max_x)
1.119 + max_x = quad_x[i];
1.120 +
1.121 + if (quad_y[i] < min_y)
1.122 + min_y = quad_y[i];
1.123 + if (quad_y[i] > max_y)
1.124 + max_y = quad_y[i];
1.125 + }
1.126 +
1.127 + return gfxRect(min_x, min_y, max_x - min_x, max_y - min_y);
1.128 +}
1.129 +
1.130 +
1.131 +static void NudgeToInteger(double *aVal)
1.132 +{
1.133 + float f = float(*aVal);
1.134 + mozilla::gfx::NudgeToInteger(&f);
1.135 + *aVal = f;
1.136 +}
1.137 +
1.138 +void
1.139 +gfxMatrix::NudgeToIntegers(void)
1.140 +{
1.141 + NudgeToInteger(&xx);
1.142 + NudgeToInteger(&xy);
1.143 + NudgeToInteger(&yx);
1.144 + NudgeToInteger(&yy);
1.145 + NudgeToInteger(&x0);
1.146 + NudgeToInteger(&y0);
1.147 +}
