gecko-dev/gfx/thebes/gfxMatrix.cpp

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Oracle Corporation code.
*
* The Initial Developer of the Original Code is Oracle Corporation.
* Portions created by the Initial Developer are Copyright (C) 2005
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Stuart Parmenter <pavlov@pavlov.net>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "gfxMatrix.h"
#include "cairo.h"
#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;
}
const gfxMatrix&
gfxMatrix::Invert()
{
cairo_matrix_invert(CAIRO_MATRIX(this));
return *this;
}
const gfxMatrix&
gfxMatrix::Scale(gfxFloat x, gfxFloat y)
{
cairo_matrix_scale(CAIRO_MATRIX(this), x, y);
return *this;
}
const gfxMatrix&
gfxMatrix::Translate(const gfxPoint& pt)
{
cairo_matrix_translate(CAIRO_MATRIX(this), pt.x, pt.y);
return *this;
}
const gfxMatrix&
gfxMatrix::Rotate(gfxFloat radians)
{
cairo_matrix_rotate(CAIRO_MATRIX(this), radians);
return *this;
}
const gfxMatrix&
gfxMatrix::Multiply(const gfxMatrix& m)
{
cairo_matrix_multiply(CAIRO_MATRIX(this), CAIRO_MATRIX(this), CONST_CAIRO_MATRIX(&m));
return *this;
}
const gfxMatrix&
gfxMatrix::PreMultiply(const gfxMatrix& m)
{
cairo_matrix_multiply(CAIRO_MATRIX(this), CONST_CAIRO_MATRIX(&m), CAIRO_MATRIX(this));
return *this;
}
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);
float r = NS_roundf(f);
if (f == r) {
*aVal = r;
}
}
void
gfxMatrix::NudgeToIntegers(void)
{
NudgeToInteger(&xx);
NudgeToInteger(&xy);
NudgeToInteger(&yx);
NudgeToInteger(&yy);
NudgeToInteger(&x0);
NudgeToInteger(&y0);
}