michael@0: /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "gfxMatrix.h"
michael@0: #include "cairo.h"
michael@0: #include "mozilla/gfx/Tools.h"
michael@0: 
michael@0: #define CAIRO_MATRIX(x) reinterpret_cast<cairo_matrix_t*>((x))
michael@0: #define CONST_CAIRO_MATRIX(x) reinterpret_cast<const cairo_matrix_t*>((x))
michael@0: 
michael@0: const gfxMatrix&
michael@0: gfxMatrix::Reset()
michael@0: {
michael@0:     cairo_matrix_init_identity(CAIRO_MATRIX(this));
michael@0:     return *this;
michael@0: }
michael@0: 
michael@0: const gfxMatrix&
michael@0: gfxMatrix::Invert()
michael@0: {
michael@0:     cairo_matrix_invert(CAIRO_MATRIX(this));
michael@0:     return *this;
michael@0: }
michael@0: 
michael@0: const gfxMatrix&
michael@0: gfxMatrix::Scale(gfxFloat x, gfxFloat y)
michael@0: {
michael@0:     cairo_matrix_scale(CAIRO_MATRIX(this), x, y);
michael@0:     return *this;
michael@0: }
michael@0: 
michael@0: const gfxMatrix&
michael@0: gfxMatrix::Translate(const gfxPoint& pt)
michael@0: {
michael@0:     cairo_matrix_translate(CAIRO_MATRIX(this), pt.x, pt.y);
michael@0:     return *this;
michael@0: }
michael@0: 
michael@0: const gfxMatrix&
michael@0: gfxMatrix::Rotate(gfxFloat radians)
michael@0: {
michael@0:     cairo_matrix_rotate(CAIRO_MATRIX(this), radians);
michael@0:     return *this;
michael@0: }
michael@0: 
michael@0: const gfxMatrix&
michael@0: gfxMatrix::Multiply(const gfxMatrix& m)
michael@0: {
michael@0:     cairo_matrix_multiply(CAIRO_MATRIX(this), CAIRO_MATRIX(this), CONST_CAIRO_MATRIX(&m));
michael@0:     return *this;
michael@0: }
michael@0: 
michael@0: const gfxMatrix&
michael@0: gfxMatrix::PreMultiply(const gfxMatrix& m)
michael@0: {
michael@0:     cairo_matrix_multiply(CAIRO_MATRIX(this), CONST_CAIRO_MATRIX(&m), CAIRO_MATRIX(this));
michael@0:     return *this;
michael@0: }
michael@0: 
michael@0: gfxPoint
michael@0: gfxMatrix::Transform(const gfxPoint& point) const
michael@0: {
michael@0:     gfxPoint ret = point;
michael@0:     cairo_matrix_transform_point(CONST_CAIRO_MATRIX(this), &ret.x, &ret.y);
michael@0:     return ret;
michael@0: }
michael@0: 
michael@0: gfxSize
michael@0: gfxMatrix::Transform(const gfxSize& size) const
michael@0: {
michael@0:     gfxSize ret = size;
michael@0:     cairo_matrix_transform_distance(CONST_CAIRO_MATRIX(this), &ret.width, &ret.height);
michael@0:     return ret;
michael@0: }
michael@0: 
michael@0: gfxRect
michael@0: gfxMatrix::Transform(const gfxRect& rect) const
michael@0: {
michael@0:     return gfxRect(Transform(rect.TopLeft()), Transform(rect.Size()));
michael@0: }
michael@0: 
michael@0: gfxRect
michael@0: gfxMatrix::TransformBounds(const gfxRect& rect) const
michael@0: {
michael@0:     /* Code taken from cairo-matrix.c, _cairo_matrix_transform_bounding_box isn't public */
michael@0:     int i;
michael@0:     double quad_x[4], quad_y[4];
michael@0:     double min_x, max_x;
michael@0:     double min_y, max_y;
michael@0: 
michael@0:     quad_x[0] = rect.X();
michael@0:     quad_y[0] = rect.Y();
michael@0:     cairo_matrix_transform_point (CONST_CAIRO_MATRIX(this), &quad_x[0], &quad_y[0]);
michael@0: 
michael@0:     quad_x[1] = rect.XMost();
michael@0:     quad_y[1] = rect.Y();
michael@0:     cairo_matrix_transform_point (CONST_CAIRO_MATRIX(this), &quad_x[1], &quad_y[1]);
michael@0: 
michael@0:     quad_x[2] = rect.X();
michael@0:     quad_y[2] = rect.YMost();
michael@0:     cairo_matrix_transform_point (CONST_CAIRO_MATRIX(this), &quad_x[2], &quad_y[2]);
michael@0: 
michael@0:     quad_x[3] = rect.XMost();
michael@0:     quad_y[3] = rect.YMost();
michael@0:     cairo_matrix_transform_point (CONST_CAIRO_MATRIX(this), &quad_x[3], &quad_y[3]);
michael@0: 
michael@0:     min_x = max_x = quad_x[0];
michael@0:     min_y = max_y = quad_y[0];
michael@0: 
michael@0:     for (i = 1; i < 4; i++) {
michael@0:         if (quad_x[i] < min_x)
michael@0:             min_x = quad_x[i];
michael@0:         if (quad_x[i] > max_x)
michael@0:             max_x = quad_x[i];
michael@0: 
michael@0:         if (quad_y[i] < min_y)
michael@0:             min_y = quad_y[i];
michael@0:         if (quad_y[i] > max_y)
michael@0:             max_y = quad_y[i];
michael@0:     }
michael@0: 
michael@0:     return gfxRect(min_x, min_y, max_x - min_x, max_y - min_y);
michael@0: }
michael@0: 
michael@0: 
michael@0: static void NudgeToInteger(double *aVal)
michael@0: {
michael@0:     float f = float(*aVal);
michael@0:     mozilla::gfx::NudgeToInteger(&f);
michael@0:     *aVal = f;
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxMatrix::NudgeToIntegers(void)
michael@0: {
michael@0:     NudgeToInteger(&xx);
michael@0:     NudgeToInteger(&xy);
michael@0:     NudgeToInteger(&yx);
michael@0:     NudgeToInteger(&yy);
michael@0:     NudgeToInteger(&x0);
michael@0:     NudgeToInteger(&y0);
michael@0: }