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gecko-dev/gfx/thebes/gfxRect.h

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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 ***** */
#ifndef GFX_RECT_H
#define GFX_RECT_H
#include "gfxTypes.h"
#include "gfxPoint.h"
#include "gfxCore.h"
#include "nsDebug.h"
namespace mozilla {
namespace css {
enum Corner {
// this order is important!
eCornerTopLeft = 0,
eCornerTopRight = 1,
eCornerBottomRight = 2,
eCornerBottomLeft = 3,
eNumCorners = 4
};
}
}
#define NS_CORNER_TOP_LEFT mozilla::css::eCornerTopLeft
#define NS_CORNER_TOP_RIGHT mozilla::css::eCornerTopRight
#define NS_CORNER_BOTTOM_RIGHT mozilla::css::eCornerBottomRight
#define NS_CORNER_BOTTOM_LEFT mozilla::css::eCornerBottomLeft
#define NS_NUM_CORNERS mozilla::css::eNumCorners
#define NS_FOR_CSS_CORNERS(var_) \
for (mozilla::css::Corner var_ = NS_CORNER_TOP_LEFT; \
var_ <= NS_CORNER_BOTTOM_LEFT; \
var_++)
static inline mozilla::css::Corner operator++(mozilla::css::Corner& corner, int) {
NS_PRECONDITION(corner >= NS_CORNER_TOP_LEFT &&
corner < NS_NUM_CORNERS, "Out of range corner");
corner = mozilla::css::Corner(corner + 1);
return corner;
}
struct THEBES_API gfxRect {
// pt? point?
gfxPoint pos;
gfxSize size;
gfxRect() {}
gfxRect(const gfxRect& s) : pos(s.pos), size(s.size) {}
gfxRect(const gfxPoint& _pos, const gfxSize& _size) : pos(_pos), size(_size) {}
gfxRect(gfxFloat _x, gfxFloat _y, gfxFloat _width, gfxFloat _height) :
pos(_x, _y), size(_width, _height) {}
int operator==(const gfxRect& s) const {
return (pos == s.pos) && (size == s.size);
}
int operator!=(const gfxRect& s) const {
return (pos != s.pos) || (size != s.size);
}
const gfxRect& MoveBy(const gfxPoint& aPt) {
pos = pos + aPt;
return *this;
}
gfxRect operator+(const gfxPoint& aPt) const {
return gfxRect(pos + aPt, size);
}
gfxRect operator-(const gfxPoint& aPt) const {
return gfxRect(pos - aPt, size);
}
gfxFloat Width() const { return size.width; }
gfxFloat Height() const { return size.height; }
gfxFloat X() const { return pos.x; }
gfxFloat Y() const { return pos.y; }
gfxFloat XMost() const { return pos.x + size.width; }
gfxFloat YMost() const { return pos.y + size.height; }
PRBool IsEmpty() const { return size.width <= 0 || size.height <= 0; }
gfxRect Intersect(const gfxRect& aRect) const;
gfxRect Union(const gfxRect& aRect) const;
PRBool Contains(const gfxRect& aRect) const;
PRBool Contains(const gfxPoint& aPoint) const;
/**
* Return true if all components of this rect are within
* aEpsilon of integer coordinates, defined as
* |round(coord) - coord| <= |aEpsilon|
* for x,y,width,height.
*/
PRBool WithinEpsilonOfIntegerPixels(gfxFloat aEpsilon) const;
gfxPoint TopLeft() { return pos; }
gfxPoint BottomRight() { return gfxPoint(XMost(), YMost()); }
void Inset(gfxFloat k) {
pos.x += k;
pos.y += k;
size.width = PR_MAX(0.0, size.width - k * 2.0);
size.height = PR_MAX(0.0, size.height - k * 2.0);
}
void Inset(gfxFloat top, gfxFloat right, gfxFloat bottom, gfxFloat left) {
pos.x += left;
pos.y += top;
size.width = PR_MAX(0.0, size.width - (right+left));
size.height = PR_MAX(0.0, size.height - (bottom+top));
}
void Inset(const gfxFloat *sides) {
Inset(sides[0], sides[1], sides[2], sides[3]);
}
void Inset(const gfxIntSize& aSize) {
Inset(aSize.height, aSize.width, aSize.height, aSize.width);
}
void Outset(gfxFloat k) {
pos.x -= k;
pos.y -= k;
size.width = PR_MAX(0.0, size.width + k * 2.0);
size.height = PR_MAX(0.0, size.height + k * 2.0);
}
void Outset(gfxFloat top, gfxFloat right, gfxFloat bottom, gfxFloat left) {
pos.x -= left;
pos.y -= top;
size.width = PR_MAX(0.0, size.width + (right+left));
size.height = PR_MAX(0.0, size.height + (bottom+top));
}
void Outset(const gfxFloat *sides) {
Outset(sides[0], sides[1], sides[2], sides[3]);
}
void Outset(const gfxIntSize& aSize) {
Outset(aSize.height, aSize.width, aSize.height, aSize.width);
}
// Round the rectangle edges to integer coordinates, such that the rounded
// rectangle has the same set of pixel centers as the original rectangle.
// Edges at offset 0.5 round up.
// Suitable for most places where integral device coordinates
// are needed, but note that any translation should be applied first to
// avoid pixel rounding errors.
// Note that this is *not* rounding to nearest integer if the values are negative.
// They are always rounding as floor(n + 0.5).
// See https://bugzilla.mozilla.org/show_bug.cgi?id=410748#c14
// If you need similar method which is using NS_round(), you should create
// new |RoundAwayFromZero()| method.
void Round();
// Snap the rectangle edges to integer coordinates, such that the
// original rectangle contains the resulting rectangle.
void RoundIn();
// Snap the rectangle edges to integer coordinates, such that the
// resulting rectangle contains the original rectangle.
void RoundOut();
// grabbing specific points
gfxPoint TopLeft() const { return gfxPoint(pos); }
gfxPoint TopRight() const { return pos + gfxSize(size.width, 0.0); }
gfxPoint BottomLeft() const { return pos + gfxSize(0.0, size.height); }
gfxPoint BottomRight() const { return pos + size; }
gfxPoint AtCorner(mozilla::css::Corner corner) const {
switch (corner) {
case NS_CORNER_TOP_LEFT: return TopLeft();
case NS_CORNER_TOP_RIGHT: return TopRight();
case NS_CORNER_BOTTOM_RIGHT: return BottomRight();
case NS_CORNER_BOTTOM_LEFT: return BottomLeft();
default:
NS_ERROR("Invalid corner!");
break;
}
return gfxPoint(0.0, 0.0);
}
gfxPoint CCWCorner(mozilla::css::Side side) const {
switch (side) {
case NS_SIDE_TOP: return TopLeft();
case NS_SIDE_RIGHT: return TopRight();
case NS_SIDE_BOTTOM: return BottomRight();
case NS_SIDE_LEFT: return BottomLeft();
default:
NS_ERROR("Invalid side!");
break;
}
return gfxPoint(0.0, 0.0);
}
gfxPoint CWCorner(mozilla::css::Side side) const {
switch (side) {
case NS_SIDE_TOP: return TopRight();
case NS_SIDE_RIGHT: return BottomRight();
case NS_SIDE_BOTTOM: return BottomLeft();
case NS_SIDE_LEFT: return TopLeft();
default:
NS_ERROR("Invalid side!");
break;
}
return gfxPoint(0.0, 0.0);
}
/* Conditions this border to Cairo's max coordinate space.
* The caller can check IsEmpty() after Condition() -- if it's TRUE,
* the caller can possibly avoid doing any extra rendering.
*/
void Condition();
void Scale(gfxFloat k) {
NS_ASSERTION(k >= 0.0, "Invalid (negative) scale factor");
pos.x *= k;
pos.y *= k;
size.width *= k;
size.height *= k;
}
void Scale(gfxFloat sx, gfxFloat sy) {
NS_ASSERTION(sx >= 0.0, "Invalid (negative) scale factor");
NS_ASSERTION(sy >= 0.0, "Invalid (negative) scale factor");
pos.x *= sx;
pos.y *= sy;
size.width *= sx;
size.height *= sy;
}
void ScaleInverse(gfxFloat k) {
NS_ASSERTION(k > 0.0, "Invalid (negative) scale factor");
pos.x /= k;
pos.y /= k;
size.width /= k;
size.height /= k;
}
};
struct THEBES_API gfxCornerSizes {
gfxSize sizes[NS_NUM_CORNERS];
gfxCornerSizes () { }
gfxCornerSizes (gfxFloat v) {
for (int i = 0; i < NS_NUM_CORNERS; i++)
sizes[i].SizeTo(v, v);
}
gfxCornerSizes (gfxFloat tl, gfxFloat tr, gfxFloat br, gfxFloat bl) {
sizes[NS_CORNER_TOP_LEFT].SizeTo(tl, tl);
sizes[NS_CORNER_TOP_RIGHT].SizeTo(tr, tr);
sizes[NS_CORNER_BOTTOM_RIGHT].SizeTo(br, br);
sizes[NS_CORNER_BOTTOM_LEFT].SizeTo(bl, bl);
}
gfxCornerSizes (const gfxSize& tl, const gfxSize& tr, const gfxSize& br, const gfxSize& bl) {
sizes[NS_CORNER_TOP_LEFT] = tl;
sizes[NS_CORNER_TOP_RIGHT] = tr;
sizes[NS_CORNER_BOTTOM_RIGHT] = br;
sizes[NS_CORNER_BOTTOM_LEFT] = bl;
}
const gfxSize& operator[] (mozilla::css::Corner index) const {
return sizes[index];
}
gfxSize& operator[] (mozilla::css::Corner index) {
return sizes[index];
}
const gfxSize TopLeft() const { return sizes[NS_CORNER_TOP_LEFT]; }
gfxSize& TopLeft() { return sizes[NS_CORNER_TOP_LEFT]; }
const gfxSize TopRight() const { return sizes[NS_CORNER_TOP_RIGHT]; }
gfxSize& TopRight() { return sizes[NS_CORNER_TOP_RIGHT]; }
const gfxSize BottomLeft() const { return sizes[NS_CORNER_BOTTOM_LEFT]; }
gfxSize& BottomLeft() { return sizes[NS_CORNER_BOTTOM_LEFT]; }
const gfxSize BottomRight() const { return sizes[NS_CORNER_BOTTOM_RIGHT]; }
gfxSize& BottomRight() { return sizes[NS_CORNER_BOTTOM_RIGHT]; }
};
#endif /* GFX_RECT_H */
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