gecko/gfx/thebes/src/gfxMatrix.cpp

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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 * The Original Code is Oracle Corporation code.
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 * Contributor(s):
 *   Stuart Parmenter <pavlov@pavlov.net>
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#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;
}

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
{
    double x0 = rect.pos.x;
    double y0 = rect.pos.y;
    double x1 = rect.pos.x + rect.size.width;
    double y1 = rect.pos.y + rect.size.height;

    cairo_matrix_transform_bounding_box(CONST_CAIRO_MATRIX(this), &x0, &y0, &x1, &y1, NULL);

    return gfxRect(x0, y0, x1 - x0, y1 - y0);
}