gecko-dev/gfx/thebes/gfxMatrix.cpp

196 строки
5.8 KiB
C++

/* -*- 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 "gfx3DMatrix.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.pos), 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.pos.x;
quad_y[0] = rect.pos.y;
cairo_matrix_transform_point (CONST_CAIRO_MATRIX(this), &quad_x[0], &quad_y[0]);
quad_x[1] = rect.pos.x + rect.size.width;
quad_y[1] = rect.pos.y;
cairo_matrix_transform_point (CONST_CAIRO_MATRIX(this), &quad_x[1], &quad_y[1]);
quad_x[2] = rect.pos.x;
quad_y[2] = rect.pos.y + rect.size.height;
cairo_matrix_transform_point (CONST_CAIRO_MATRIX(this), &quad_x[2], &quad_y[2]);
quad_x[3] = rect.pos.x + rect.size.width;
quad_y[3] = rect.pos.y + rect.size.height;
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];
}
// we don't compute this now
#if 0
if (is_tight) {
/* it's tight if and only if the four corner points form an axis-aligned
rectangle.
And that's true if and only if we can derive corners 0 and 3 from
corners 1 and 2 in one of two straightforward ways...
We could use a tolerance here but for now we'll fall back to FALSE in the case
of floating point error.
*/
*is_tight =
(quad_x[1] == quad_x[0] && quad_y[1] == quad_y[3] &&
quad_x[2] == quad_x[3] && quad_y[2] == quad_y[0]) ||
(quad_x[1] == quad_x[3] && quad_y[1] == quad_y[0] &&
quad_x[2] == quad_x[0] && quad_y[2] == quad_y[3]);
}
#endif
return gfxRect(min_x, min_y, max_x - min_x, max_y - min_y);
}
PRBool
gfx3DMatrix::Is2D(gfxMatrix* aMatrix) const
{
if (_13 != 0.0f || _14 != 0.0f ||
_23 != 0.0f || _24 != 0.0f ||
_31 != 0.0f || _32 != 0.0f || _33 != 1.0f || _34 != 0.0f ||
_43 != 0.0f || _44 != 1.0f) {
return PR_FALSE;
}
if (aMatrix) {
aMatrix->xx = _11;
aMatrix->yx = _12;
aMatrix->xy = _21;
aMatrix->yy = _22;
aMatrix->x0 = _41;
aMatrix->y0 = _42;
}
return PR_TRUE;
}