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nsStyleStruct.h
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nsStyleStruct.h
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** 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 mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Mats Palmgren <matspal@gmail.com>
* Masayuki Nakano <masayuki@d-toybox.com>
* Rob Arnold <robarnold@mozilla.com>
* Jonathon Jongsma <jonathon.jongsma@collabora.co.uk>, Collabora Ltd.
* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation
*
* Alternatively, the contents of this file may be used under the terms of
* either of 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 ***** */
/*
* structs that contain the data provided by nsStyleContext, the
* internal API for computed style data for an element
*/
#ifndef nsStyleStruct_h___
#define nsStyleStruct_h___
#include "nsColor.h"
#include "nsCoord.h"
#include "nsMargin.h"
#include "nsRect.h"
#include "nsFont.h"
#include "nsStyleCoord.h"
#include "nsStyleConsts.h"
#include "nsChangeHint.h"
#include "nsPresContext.h"
#include "nsCOMPtr.h"
#include "nsCOMArray.h"
#include "nsTArray.h"
#include "nsIAtom.h"
#include "nsIURI.h"
#include "nsCSSValue.h"
#include "nsStyleTransformMatrix.h"
#include "nsAlgorithm.h"
#include "imgIRequest.h"
#include "gfxRect.h"
class nsIFrame;
class imgIRequest;
class imgIContainer;
struct nsCSSValueList;
// Includes nsStyleStructID.
#include "nsStyleStructFwd.h"
// Bits for each struct.
// NS_STYLE_INHERIT_BIT defined in nsStyleStructFwd.h
#define NS_STYLE_INHERIT_MASK 0x00ffffff
// Additional bits for nsStyleContext's mBits:
// See nsStyleContext::HasTextDecorations
#define NS_STYLE_HAS_TEXT_DECORATIONS 0x01000000
// See nsStyleContext::HasPseudoElementData.
#define NS_STYLE_HAS_PSEUDO_ELEMENT_DATA 0x02000000
// See nsStyleContext::RelevantLinkIsVisited
#define NS_STYLE_RELEVANT_LINK_VISITED 0x04000000
// See nsStyleContext::IsStyleIfVisited
#define NS_STYLE_IS_STYLE_IF_VISITED 0x08000000
// See nsStyleContext::GetPseudoEnum
#define NS_STYLE_CONTEXT_TYPE_MASK 0xf0000000
#define NS_STYLE_CONTEXT_TYPE_SHIFT 28
// Additional bits for nsRuleNode's mDependentBits:
#define NS_RULE_NODE_GC_MARK 0x02000000
#define NS_RULE_NODE_IS_IMPORTANT 0x08000000
#define NS_RULE_NODE_LEVEL_MASK 0xf0000000
#define NS_RULE_NODE_LEVEL_SHIFT 28
// The lifetime of these objects is managed by the presshell's arena.
// Each struct must implement a static ForceCompare() function returning a
// boolean. Structs that can return a hint that doesn't guarantee that the
// change will be applied to all descendants must return true from
// ForceCompare(), so that we will make sure to compare those structs in
// nsStyleContext::CalcStyleDifference.
struct nsStyleFont {
nsStyleFont(const nsFont& aFont, nsPresContext *aPresContext);
nsStyleFont(const nsStyleFont& aStyleFont);
nsStyleFont(nsPresContext *aPresContext);
~nsStyleFont(void) {
MOZ_COUNT_DTOR(nsStyleFont);
}
nsChangeHint CalcDifference(const nsStyleFont& aOther) const;
#ifdef DEBUG
static nsChangeHint MaxDifference();
#endif
static PRBool ForceCompare() { return PR_FALSE; }
static nsChangeHint CalcFontDifference(const nsFont& aFont1, const nsFont& aFont2);
static nscoord ZoomText(nsPresContext* aPresContext, nscoord aSize);
static nscoord UnZoomText(nsPresContext* aPresContext, nscoord aSize);
void* operator new(size_t sz, nsPresContext* aContext) CPP_THROW_NEW;
void Destroy(nsPresContext* aContext);
nsFont mFont; // [inherited]
nscoord mSize; // [inherited] Our "computed size". Can be different
// from mFont.size which is our "actual size" and is
// enforced to be >= the user's preferred min-size.
// mFont.size should be used for display purposes
// while mSize is the value to return in
// getComputedStyle() for example.
PRUint8 mGenericID; // [inherited] generic CSS font family, if any;
// value is a kGenericFont_* constant, see nsFont.h.
#ifdef MOZ_MATHML
// MathML scriptlevel support
PRInt8 mScriptLevel; // [inherited]
// The value mSize would have had if scriptminsize had never been applied
nscoord mScriptUnconstrainedSize;
nscoord mScriptMinSize; // [inherited] length
float mScriptSizeMultiplier; // [inherited]
#endif
};
struct nsStyleGradientStop {
nsStyleCoord mLocation; // percent, coord, none
nscolor mColor;
};
class nsStyleGradient {
public:
nsStyleGradient();
PRUint8 mShape; // NS_STYLE_GRADIENT_SHAPE_*
PRUint8 mSize; // NS_STYLE_GRADIENT_SIZE_*;
// not used (must be FARTHEST_CORNER) for linear shape
PRPackedBool mRepeating;
nsStyleCoord mBgPosX; // percent, coord, calc, none
nsStyleCoord mBgPosY; // percent, coord, calc, none
nsStyleCoord mAngle; // none, angle
// stops are in the order specified in the stylesheet
nsTArray<nsStyleGradientStop> mStops;
PRBool operator==(const nsStyleGradient& aOther) const;
PRBool operator!=(const nsStyleGradient& aOther) const {
return !(*this == aOther);
};
PRBool IsOpaque();
NS_INLINE_DECL_REFCOUNTING(nsStyleGradient)
private:
~nsStyleGradient() {}
// Not to be implemented
nsStyleGradient(const nsStyleGradient& aOther);
nsStyleGradient& operator=(const nsStyleGradient& aOther);
};
enum nsStyleImageType {
eStyleImageType_Null,
eStyleImageType_Image,
eStyleImageType_Gradient,
eStyleImageType_Element
};
/**
* Represents a paintable image of one of the following types.
* (1) A real image loaded from an external source.
* (2) A CSS linear or radial gradient.
* (3) An element within a document, or an <img>, <video>, or <canvas> element
* not in a document.
* (*) Optionally a crop rect can be set to paint a partial (rectangular)
* region of an image. (Currently, this feature is only supported with an
* image of type (1)).
*
* This struct is currently used only for 'background-image', but it may be
* used by other CSS properties such as 'border-image', 'list-style-image', and
* 'content' in the future (bug 507052).
*/
struct nsStyleImage {
nsStyleImage();
~nsStyleImage();
nsStyleImage(const nsStyleImage& aOther);
nsStyleImage& operator=(const nsStyleImage& aOther);
void SetNull();
void SetImageData(imgIRequest* aImage);
void TrackImage(nsPresContext* aContext);
void UntrackImage(nsPresContext* aContext);
void SetGradientData(nsStyleGradient* aGradient);
void SetElementId(const PRUnichar* aElementId);
void SetCropRect(nsStyleSides* aCropRect);
nsStyleImageType GetType() const {
return mType;
}
imgIRequest* GetImageData() const {
NS_ABORT_IF_FALSE(mType == eStyleImageType_Image, "Data is not an image!");
NS_ABORT_IF_FALSE(mImageTracked,
"Should be tracking any image we're going to use!");
return mImage;
}
nsStyleGradient* GetGradientData() const {
NS_ASSERTION(mType == eStyleImageType_Gradient, "Data is not a gradient!");
return mGradient;
}
const PRUnichar* GetElementId() const {
NS_ASSERTION(mType == eStyleImageType_Element, "Data is not an element!");
return mElementId;
}
nsStyleSides* GetCropRect() const {
NS_ASSERTION(mType == eStyleImageType_Image,
"Only image data can have a crop rect");
return mCropRect;
}
/**
* Compute the actual crop rect in pixels, using the source image bounds.
* The computation involves converting percentage unit to pixel unit and
* clamping each side value to fit in the source image bounds.
* @param aActualCropRect the computed actual crop rect.
* @param aIsEntireImage PR_TRUE iff |aActualCropRect| is identical to the
* source image bounds.
* @return PR_TRUE iff |aActualCropRect| holds a meaningful value.
*/
PRBool ComputeActualCropRect(nsIntRect& aActualCropRect,
PRBool* aIsEntireImage = nsnull) const;
/**
* Requests a decode on the image.
*/
nsresult RequestDecode() const;
/**
* @return PR_TRUE if the item is definitely opaque --- i.e., paints every
* pixel within its bounds opaquely, and the bounds contains at least a pixel.
*/
PRBool IsOpaque() const;
/**
* @return PR_TRUE if this image is fully loaded, and its size is calculated;
* always returns PR_TRUE if |mType| is |eStyleImageType_Gradient| or
* |eStyleImageType_Element|.
*/
PRBool IsComplete() const;
/**
* @return PR_TRUE if it is 100% confident that this image contains no pixel
* to draw.
*/
PRBool IsEmpty() const {
// There are some other cases when the image will be empty, for example
// when the crop rect is empty. However, checking the emptiness of crop
// rect is non-trivial since each side value can be specified with
// percentage unit, which can not be evaluated until the source image size
// is available. Therefore, we currently postpone the evaluation of crop
// rect until the actual rendering time --- alternatively until GetOpaqueRegion()
// is called.
return mType == eStyleImageType_Null;
}
PRBool operator==(const nsStyleImage& aOther) const;
PRBool operator!=(const nsStyleImage& aOther) const {
return !(*this == aOther);
}
private:
void DoCopy(const nsStyleImage& aOther);
nsStyleImageType mType;
union {
imgIRequest* mImage;
nsStyleGradient* mGradient;
PRUnichar* mElementId;
};
// This is _currently_ used only in conjunction with eStyleImageType_Image.
nsAutoPtr<nsStyleSides> mCropRect;
#ifdef DEBUG
bool mImageTracked;
#endif
};
struct nsStyleColor {
nsStyleColor(nsPresContext* aPresContext);
nsStyleColor(const nsStyleColor& aOther);
~nsStyleColor(void) {
MOZ_COUNT_DTOR(nsStyleColor);
}
nsChangeHint CalcDifference(const nsStyleColor& aOther) const;
#ifdef DEBUG
static nsChangeHint MaxDifference();
#endif
static PRBool ForceCompare() { return PR_FALSE; }
void* operator new(size_t sz, nsPresContext* aContext) CPP_THROW_NEW {
return aContext->AllocateFromShell(sz);
}
void Destroy(nsPresContext* aContext) {
this->~nsStyleColor();
aContext->FreeToShell(sizeof(nsStyleColor), this);
}
// Don't add ANY members to this struct! We can achieve caching in the rule
// tree (rather than the style tree) by letting color stay by itself! -dwh
nscolor mColor; // [inherited]
};
struct nsStyleBackground {
nsStyleBackground();
nsStyleBackground(const nsStyleBackground& aOther);
~nsStyleBackground();
void* operator new(size_t sz, nsPresContext* aContext) CPP_THROW_NEW {
return aContext->AllocateFromShell(sz);
}
void Destroy(nsPresContext* aContext);
nsChangeHint CalcDifference(const nsStyleBackground& aOther) const;
#ifdef DEBUG
static nsChangeHint MaxDifference();
#endif
static PRBool ForceCompare() { return PR_FALSE; }
struct Position;
friend struct Position;
struct Position {
struct PositionCoord {
// A 'background-position' can be a linear combination of length
// and percent (thanks to calc(), which can combine them).
nscoord mLength;
float mPercent;
bool operator==(const PositionCoord& aOther) const
{ return mLength == aOther.mLength && mPercent == aOther.mPercent; }
bool operator!=(const PositionCoord& aOther) const
{ return !(*this == aOther); }
};
PositionCoord mXPosition, mYPosition;
// Initialize nothing
Position() {}
// Initialize to initial values
void SetInitialValues();
// True if the effective background image position described by this depends
// on the size of the corresponding frame.
PRBool DependsOnFrameSize() const {
return mXPosition.mPercent != 0.0f || mYPosition.mPercent != 0.0f;
}
bool operator==(const Position& aOther) const {
return mXPosition == aOther.mXPosition &&
mYPosition == aOther.mYPosition;
}
bool operator!=(const Position& aOther) const {
return !(*this == aOther);
}
};
struct Size;
friend struct Size;
struct Size {
struct Dimension {
// A 'background-size' can be a linear combination of length
// and percent (thanks to calc(), which can combine them).
nscoord mLength;
float mPercent;
bool operator==(const Dimension& aOther) const
{ return mLength == aOther.mLength && mPercent == aOther.mPercent; }
bool operator!=(const Dimension& aOther) const
{ return !(*this == aOther); }
};
Dimension mWidth, mHeight;
// Except for eLengthPercentage, Dimension types which might change
// how a layer is painted when the corresponding frame's dimensions
// change *must* precede all dimension types which are agnostic to
// frame size; see DependsOnFrameSize below.
enum DimensionType {
// If one of mWidth and mHeight is eContain or eCover, then both are.
// Also, these two values must equal the corresponding values in
// kBackgroundSizeKTable.
eContain, eCover,
eAuto,
eLengthPercentage,
eDimensionType_COUNT
};
PRUint8 mWidthType, mHeightType;
// True if the effective image size described by this depends on
// the size of the corresponding frame. Gradients depend on the
// frame size when their dimensions are 'auto', images don't; both
// types depend on the frame size when their dimensions are
// 'contain', 'cover', or a percentage.
// -moz-element also depends on the frame size when the dimensions
// are 'auto' since it could be an SVG gradient or pattern which
// behaves exactly like a CSS gradient.
bool DependsOnFrameSize(nsStyleImageType aType) const {
if ((mWidthType == eLengthPercentage && mWidth.mPercent != 0.0f) ||
(mHeightType == eLengthPercentage && mHeight.mPercent != 0.0f)) {
return true;
}
if (aType == eStyleImageType_Image) {
return mWidthType <= eCover || mHeightType <= eCover;
} else {
NS_ABORT_IF_FALSE(aType == eStyleImageType_Gradient ||
aType == eStyleImageType_Element,
"unrecognized image type");
return mWidthType <= eAuto || mHeightType <= eAuto;
}
}
// Initialize nothing
Size() {}
// Initialize to initial values
void SetInitialValues();
bool operator==(const Size& aOther) const;
bool operator!=(const Size& aOther) const {
return !(*this == aOther);
}
};
struct Layer;
friend struct Layer;
struct Layer {
PRUint8 mAttachment; // [reset] See nsStyleConsts.h
PRUint8 mClip; // [reset] See nsStyleConsts.h
PRUint8 mOrigin; // [reset] See nsStyleConsts.h
PRUint8 mRepeat; // [reset] See nsStyleConsts.h
Position mPosition; // [reset]
nsStyleImage mImage; // [reset]
Size mSize; // [reset]
// Initializes only mImage
Layer();
~Layer();
// Register/unregister images with the document. We do this only
// after the dust has settled in ComputeBackgroundData.
void TrackImages(nsPresContext* aContext) {
if (mImage.GetType() == eStyleImageType_Image)
mImage.TrackImage(aContext);
}
void UntrackImages(nsPresContext* aContext) {
if (mImage.GetType() == eStyleImageType_Image)
mImage.UntrackImage(aContext);
}
void SetInitialValues();
// True if the rendering of this layer might change when the size
// of the corresponding frame changes. This is true for any
// non-solid-color background whose position or size depends on
// the frame size. It's also true for SVG images whose root <svg>
// node has a viewBox.
PRBool RenderingMightDependOnFrameSize() const;
// An equality operator that compares the images using URL-equality
// rather than pointer-equality.
PRBool operator==(const Layer& aOther) const;
PRBool operator!=(const Layer& aOther) const {
return !(*this == aOther);
}
};
// The (positive) number of computed values of each property, since
// the lengths of the lists are independent.
PRUint32 mAttachmentCount,
mClipCount,
mOriginCount,
mRepeatCount,
mPositionCount,
mImageCount,
mSizeCount;
// Layers are stored in an array, matching the top-to-bottom order in
// which they are specified in CSS. The number of layers to be used
// should come from the background-image property. We create
// additional |Layer| objects for *any* property, not just
// background-image. This means that the bottommost layer that
// callers in layout care about (which is also the one whose
// background-clip applies to the background-color) may not be last
// layer. In layers below the bottom layer, properties will be
// uninitialized unless their count, above, indicates that they are
// present.
nsAutoTArray<Layer, 1> mLayers;
const Layer& BottomLayer() const { return mLayers[mImageCount - 1]; }
#define NS_FOR_VISIBLE_BACKGROUND_LAYERS_BACK_TO_FRONT(var_, stylebg_) \
for (PRUint32 var_ = (stylebg_)->mImageCount; var_-- != 0; )
nscolor mBackgroundColor; // [reset]
// FIXME: This (now background-break in css3-background) should
// probably move into a different struct so that everything in
// nsStyleBackground is set by the background shorthand.
PRUint8 mBackgroundInlinePolicy; // [reset] See nsStyleConsts.h
// True if this background is completely transparent.
PRBool IsTransparent() const;
// We have to take slower codepaths for fixed background attachment,
// but we don't want to do that when there's no image.
// Not inline because it uses an nsCOMPtr<imgIRequest>
// FIXME: Should be in nsStyleStructInlines.h.
PRBool HasFixedBackground() const;
};
// See https://bugzilla.mozilla.org/show_bug.cgi?id=271586#c43 for why
// this is hard to replace with 'currentColor'.
#define BORDER_COLOR_FOREGROUND 0x20
#define OUTLINE_COLOR_INITIAL 0x80
// FOREGROUND | INITIAL(OUTLINE)
#define BORDER_COLOR_SPECIAL 0xA0
#define BORDER_STYLE_MASK 0x1F
#define NS_SPACING_MARGIN 0
#define NS_SPACING_PADDING 1
#define NS_SPACING_BORDER 2
struct nsStyleMargin {
nsStyleMargin(void);
nsStyleMargin(const nsStyleMargin& aMargin);
~nsStyleMargin(void) {
MOZ_COUNT_DTOR(nsStyleMargin);
}
void* operator new(size_t sz, nsPresContext* aContext) CPP_THROW_NEW;
void Destroy(nsPresContext* aContext);
void RecalcData();
nsChangeHint CalcDifference(const nsStyleMargin& aOther) const;
#ifdef DEBUG
static nsChangeHint MaxDifference();
#endif
static PRBool ForceCompare() { return PR_TRUE; }
nsStyleSides mMargin; // [reset] coord, percent, calc, auto
PRBool IsWidthDependent() const { return !mHasCachedMargin; }
PRBool GetMargin(nsMargin& aMargin) const
{
if (mHasCachedMargin) {
aMargin = mCachedMargin;
return PR_TRUE;
}
return PR_FALSE;
}
protected:
PRPackedBool mHasCachedMargin;
nsMargin mCachedMargin;
};
struct nsStylePadding {
nsStylePadding(void);
nsStylePadding(const nsStylePadding& aPadding);
~nsStylePadding(void) {
MOZ_COUNT_DTOR(nsStylePadding);
}
void* operator new(size_t sz, nsPresContext* aContext) CPP_THROW_NEW;
void Destroy(nsPresContext* aContext);
void RecalcData();
nsChangeHint CalcDifference(const nsStylePadding& aOther) const;
#ifdef DEBUG
static nsChangeHint MaxDifference();
#endif
static PRBool ForceCompare() { return PR_TRUE; }
nsStyleSides mPadding; // [reset] coord, percent, calc
PRBool IsWidthDependent() const { return !mHasCachedPadding; }
PRBool GetPadding(nsMargin& aPadding) const
{
if (mHasCachedPadding) {
aPadding = mCachedPadding;
return PR_TRUE;
}
return PR_FALSE;
}
protected:
PRPackedBool mHasCachedPadding;
nsMargin mCachedPadding;
};
struct nsBorderColors {
nsBorderColors* mNext;
nscolor mColor;
nsBorderColors() : mNext(nsnull), mColor(NS_RGB(0,0,0)) {}
nsBorderColors(const nscolor& aColor) : mNext(nsnull), mColor(aColor) {}
~nsBorderColors();
nsBorderColors* Clone() const { return Clone(PR_TRUE); }
static PRBool Equal(const nsBorderColors* c1,
const nsBorderColors* c2) {
if (c1 == c2)
return PR_TRUE;
while (c1 && c2) {
if (c1->mColor != c2->mColor)
return PR_FALSE;
c1 = c1->mNext;
c2 = c2->mNext;
}
// both should be NULL if these are equal, otherwise one
// has more colors than another
return !c1 && !c2;
}
private:
nsBorderColors* Clone(PRBool aDeep) const;
};
struct nsCSSShadowItem {
nscoord mXOffset;
nscoord mYOffset;
nscoord mRadius;
nscoord mSpread;
nscolor mColor;
PRPackedBool mHasColor; // Whether mColor should be used
PRPackedBool mInset;
nsCSSShadowItem() : mHasColor(PR_FALSE) {
MOZ_COUNT_CTOR(nsCSSShadowItem);
}
~nsCSSShadowItem() {
MOZ_COUNT_DTOR(nsCSSShadowItem);
}
PRBool operator==(const nsCSSShadowItem& aOther) {
return (mXOffset == aOther.mXOffset &&
mYOffset == aOther.mYOffset &&
mRadius == aOther.mRadius &&
mHasColor == aOther.mHasColor &&
mSpread == aOther.mSpread &&
mInset == aOther.mInset &&
(!mHasColor || mColor == aOther.mColor));
}
PRBool operator!=(const nsCSSShadowItem& aOther) {
return !(*this == aOther);
}
};
class nsCSSShadowArray {
public:
void* operator new(size_t aBaseSize, PRUint32 aArrayLen) {
// We can allocate both this nsCSSShadowArray and the
// actual array in one allocation. The amount of memory to
// allocate is equal to the class's size + the number of bytes for all
// but the first array item (because aBaseSize includes one
// item, see the private declarations)
return ::operator new(aBaseSize +
(aArrayLen - 1) * sizeof(nsCSSShadowItem));
}
nsCSSShadowArray(PRUint32 aArrayLen) :
mLength(aArrayLen)
{
MOZ_COUNT_CTOR(nsCSSShadowArray);
for (PRUint32 i = 1; i < mLength; ++i) {
// Make sure we call the constructors of each nsCSSShadowItem
// (the first one is called for us because we declared it under private)
new (&mArray[i]) nsCSSShadowItem();
}
}
~nsCSSShadowArray() {
MOZ_COUNT_DTOR(nsCSSShadowArray);
for (PRUint32 i = 1; i < mLength; ++i) {
mArray[i].~nsCSSShadowItem();
}
}
PRUint32 Length() const { return mLength; }
nsCSSShadowItem* ShadowAt(PRUint32 i) {
NS_ABORT_IF_FALSE(i < mLength, "Accessing too high an index in the text shadow array!");
return &mArray[i];
}
const nsCSSShadowItem* ShadowAt(PRUint32 i) const {
NS_ABORT_IF_FALSE(i < mLength, "Accessing too high an index in the text shadow array!");
return &mArray[i];
}
NS_INLINE_DECL_REFCOUNTING(nsCSSShadowArray)
private:
PRUint32 mLength;
nsCSSShadowItem mArray[1]; // This MUST be the last item
};
// Border widths are rounded to the nearest-below integer number of pixels,
// but values between zero and one device pixels are always rounded up to
// one device pixel.
#define NS_ROUND_BORDER_TO_PIXELS(l,tpp) \
((l) == 0) ? 0 : NS_MAX((tpp), (l) / (tpp) * (tpp))
// Outline offset is rounded to the nearest integer number of pixels, but values
// between zero and one device pixels are always rounded up to one device pixel.
// Note that the offset can be negative.
#define NS_ROUND_OFFSET_TO_PIXELS(l,tpp) \
(((l) == 0) ? 0 : \
((l) > 0) ? NS_MAX( (tpp), ((l) + ((tpp) / 2)) / (tpp) * (tpp)) : \
NS_MIN(-(tpp), ((l) - ((tpp) / 2)) / (tpp) * (tpp)))
// Returns if the given border style type is visible or not
static PRBool IsVisibleBorderStyle(PRUint8 aStyle)
{
return (aStyle != NS_STYLE_BORDER_STYLE_NONE &&
aStyle != NS_STYLE_BORDER_STYLE_HIDDEN);
}
struct nsStyleBorder {
nsStyleBorder(nsPresContext* aContext);
nsStyleBorder(const nsStyleBorder& aBorder);
~nsStyleBorder();
void* operator new(size_t sz, nsPresContext* aContext) CPP_THROW_NEW;
void Destroy(nsPresContext* aContext);
nsChangeHint CalcDifference(const nsStyleBorder& aOther) const;
#ifdef DEBUG
static nsChangeHint MaxDifference();
#endif
static PRBool ForceCompare() { return PR_FALSE; }
PRBool ImageBorderDiffers() const;
nsStyleCorners mBorderRadius; // [reset] coord, percent, calc
nsStyleSides mBorderImageSplit; // [reset] integer, percent
PRUint8 mFloatEdge; // [reset] see nsStyleConsts.h
PRUint8 mBorderImageHFill; // [reset]
PRUint8 mBorderImageVFill; // [reset]
nsBorderColors** mBorderColors; // [reset] multiple levels of color for a border.
nsRefPtr<nsCSSShadowArray> mBoxShadow; // [reset] NULL for 'none'
PRBool mHaveBorderImageWidth; // [reset]
nsMargin mBorderImageWidth; // [reset]
void EnsureBorderColors() {
if (!mBorderColors) {
mBorderColors = new nsBorderColors*[4];
if (mBorderColors)
for (PRInt32 i = 0; i < 4; i++)
mBorderColors[i] = nsnull;
}
}
void ClearBorderColors(mozilla::css::Side aSide) {
if (mBorderColors && mBorderColors[aSide]) {
delete mBorderColors[aSide];
mBorderColors[aSide] = nsnull;
}
}
// Return whether aStyle is a visible style. Invisible styles cause
// the relevant computed border width to be 0.
// Note that this does *not* consider the effects of 'border-image':
// if border-style is none, but there is a loaded border image,
// HasVisibleStyle will be false even though there *is* a border.
PRBool HasVisibleStyle(mozilla::css::Side aSide)
{
return IsVisibleBorderStyle(GetBorderStyle(aSide));
}
// aBorderWidth is in twips
void SetBorderWidth(mozilla::css::Side aSide, nscoord aBorderWidth)
{
nscoord roundedWidth =
NS_ROUND_BORDER_TO_PIXELS(aBorderWidth, mTwipsPerPixel);
mBorder.side(aSide) = roundedWidth;
if (HasVisibleStyle(aSide))
mComputedBorder.side(aSide) = roundedWidth;
}
void SetBorderImageWidthOverride(mozilla::css::Side aSide, nscoord aBorderWidth)
{
mBorderImageWidth.side(aSide) =
NS_ROUND_BORDER_TO_PIXELS(aBorderWidth, mTwipsPerPixel);
}
// Get the actual border, in twips. (If there is no border-image
// loaded, this is the same as GetComputedBorder. If there is a
// border-image loaded, it uses the border-image width overrides if
// present, and otherwise mBorder, which is GetComputedBorder without
// considering border-style: none.)
const nsMargin& GetActualBorder() const;
// Get the computed border (plus rounding). This does consider the
// effects of 'border-style: none', but does not consider
// 'border-image'.
const nsMargin& GetComputedBorder() const
{
return mComputedBorder;
}
// Get the actual border width for a particular side, in appunits. Note that
// this is zero if and only if there is no border to be painted for this
// side. That is, this value takes into account the border style and the
// value is rounded to the nearest device pixel by NS_ROUND_BORDER_TO_PIXELS.
nscoord GetActualBorderWidth(mozilla::css::Side aSide) const
{
return GetActualBorder().side(aSide);
}
PRUint8 GetBorderStyle(mozilla::css::Side aSide) const
{
NS_ASSERTION(aSide <= NS_SIDE_LEFT, "bad side");
return (mBorderStyle[aSide] & BORDER_STYLE_MASK);
}
void SetBorderStyle(mozilla::css::Side aSide, PRUint8 aStyle)
{
NS_ASSERTION(aSide <= NS_SIDE_LEFT, "bad side");
mBorderStyle[aSide] &= ~BORDER_STYLE_MASK;
mBorderStyle[aSide] |= (aStyle & BORDER_STYLE_MASK);
mComputedBorder.side(aSide) =
(HasVisibleStyle(aSide) ? mBorder.side(aSide) : 0);
}
// Defined in nsStyleStructInlines.h
inline PRBool IsBorderImageLoaded() const;
inline nsresult RequestDecode();
void GetBorderColor(mozilla::css::Side aSide, nscolor& aColor,
PRBool& aForeground) const
{
aForeground = PR_FALSE;
NS_ASSERTION(aSide <= NS_SIDE_LEFT, "bad side");
if ((mBorderStyle[aSide] & BORDER_COLOR_SPECIAL) == 0)
aColor = mBorderColor[aSide];
else if (mBorderStyle[aSide] & BORDER_COLOR_FOREGROUND)
aForeground = PR_TRUE;
else
NS_NOTREACHED("OUTLINE_COLOR_INITIAL should not be set here");
}
void SetBorderColor(mozilla::css::Side aSide, nscolor aColor)
{
NS_ASSERTION(aSide <= NS_SIDE_LEFT, "bad side");
mBorderColor[aSide] = aColor;
mBorderStyle[aSide] &= ~BORDER_COLOR_SPECIAL;
}
// These are defined in nsStyleStructInlines.h
inline void SetBorderImage(imgIRequest* aImage);
inline imgIRequest* GetBorderImage() const;
bool HasBorderImage() {return !!mBorderImage;}
void TrackImage(nsPresContext* aContext);
void UntrackImage(nsPresContext* aContext);
// These methods are used for the caller to caches the sub images created during
// a border-image paint operation
inline void SetSubImage(PRUint8 aIndex, imgIContainer* aSubImage) const;
inline imgIContainer* GetSubImage(PRUint8 aIndex) const;
void GetCompositeColors(PRInt32 aIndex, nsBorderColors** aColors) const
{
if (!mBorderColors)
*aColors = nsnull;
else
*aColors = mBorderColors[aIndex];
}
void AppendBorderColor(PRInt32 aIndex, nscolor aColor)
{
NS_ASSERTION(aIndex >= 0 && aIndex <= 3, "bad side for composite border color");
nsBorderColors* colorEntry = new nsBorderColors(aColor);
if (!mBorderColors[aIndex])
mBorderColors[aIndex] = colorEntry;
else {
nsBorderColors* last = mBorderColors[aIndex];
while (last->mNext)
last = last->mNext;
last->mNext = colorEntry;
}
mBorderStyle[aIndex] &= ~BORDER_COLOR_SPECIAL;
}
void SetBorderToForeground(mozilla::css::Side aSide)
{
NS_ASSERTION(aSide <= NS_SIDE_LEFT, "bad side");
mBorderStyle[aSide] &= ~BORDER_COLOR_SPECIAL;
mBorderStyle[aSide] |= BORDER_COLOR_FOREGROUND;
}
#ifdef DEBUG
bool mImageTracked;
#endif
protected:
// mComputedBorder holds the CSS2.1 computed border-width values. In
// particular, these widths take into account the border-style for the
// relevant side and the values are rounded to the nearest device
// pixel. They are also rounded (which is not part of the definition
// of computed values). However, they do *not* take into account the
// presence of border-image. See GetActualBorder above for how to
// really get the actual border.
nsMargin mComputedBorder;
// mBorder holds the nscoord values for the border widths as they would be if
// all the border-style values were visible (not hidden or none). This
// member exists so that when we create structs using the copy
// constructor during style resolution the new structs will know what the
// specified values of the border were in case they have more specific rules
// setting the border style. Note that this isn't quite the CSS specified
// value, since this has had the enumerated border widths converted to
// lengths, and all lengths converted to twips. But it's not quite the
// computed value either. The values are rounded to the nearest device pixel
// We also use these values when we have a loaded border-image that
// does not have width overrides.
nsMargin mBorder;
PRUint8 mBorderStyle[4]; // [reset] See nsStyleConsts.h
nscolor mBorderColor[4]; // [reset] the colors to use for a simple border. not used
// if -moz-border-colors is specified
private:
nsCOMPtr<imgIRequest> mBorderImage; // [reset]
// Cache used by callers for border-image painting
nsCOMArray<imgIContainer> mSubImages;
nscoord mTwipsPerPixel;
nsStyleBorder& operator=(const nsStyleBorder& aOther); // Not to be implemented
};
struct nsStyleOutline {
nsStyleOutline(nsPresContext* aPresContext);
nsStyleOutline(const nsStyleOutline& aOutline);
~nsStyleOutline(void) {
MOZ_COUNT_DTOR(nsStyleOutline);
}
void* operator new(size_t sz, nsPresContext* aContext) CPP_THROW_NEW {
return aContext->AllocateFromShell(sz);
}
void Destroy(nsPresContext* aContext) {
this->~nsStyleOutline();
aContext->FreeToShell(sizeof(nsStyleOutline), this);
}
void RecalcData(nsPresContext* aContext);
nsChangeHint CalcDifference(const nsStyleOutline& aOther) const;
#ifdef DEBUG
static nsChangeHint MaxDifference();
#endif
static PRBool ForceCompare() { return PR_FALSE; }
nsStyleCorners mOutlineRadius; // [reset] coord, percent, calc
// Note that this is a specified value. You can get the actual values
// with GetOutlineWidth. You cannot get the computed value directly.
nsStyleCoord mOutlineWidth; // [reset] coord, enum (see nsStyleConsts.h)
nscoord mOutlineOffset; // [reset]
PRBool GetOutlineWidth(nscoord& aWidth) const
{
if (mHasCachedOutline) {
aWidth = mCachedOutlineWidth;
return PR_TRUE;
}
return PR_FALSE;