gecko/layout/svg/nsSVGGlyphFrame.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2012-05-21 04:12:37 -07:00
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef __NS_SVGGLYPHFRAME_H__
#define __NS_SVGGLYPHFRAME_H__
#include "mozilla/Attributes.h"
#include "gfxFont.h"
#include "nsISVGGlyphFragmentNode.h"
#include "nsISVGChildFrame.h"
#include "nsSVGGeometryFrame.h"
#include "nsSVGUtils.h"
#include "nsTextFragment.h"
#include "gfxSVGGlyphs.h"
class CharacterIterator;
class gfxContext;
class nsDisplaySVGGlyphs;
class nsIDOMSVGRect;
class nsRenderingContext;
class nsSVGGlyphFrame;
class nsSVGTextFrame;
class nsSVGTextPathFrame;
class gfxTextObjectPaint;
struct CharacterPosition;
typedef gfxFont::DrawMode DrawMode;
typedef nsSVGGeometryFrame nsSVGGlyphFrameBase;
class nsSVGGlyphFrame : public nsSVGGlyphFrameBase,
public nsISVGGlyphFragmentNode,
public nsISVGChildFrame
{
class AutoCanvasTMForMarker;
friend class AutoCanvasTMForMarker;
friend class CharacterIterator;
friend nsIFrame*
NS_NewSVGGlyphFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
protected:
nsSVGGlyphFrame(nsStyleContext* aContext)
: nsSVGGlyphFrameBase(aContext),
mTextRun(nullptr),
mStartIndex(0),
mGetCanvasTMForFlag(nsISVGChildFrame::FOR_OUTERSVG_TM),
mCompressWhitespace(true),
mTrimLeadingWhitespace(false),
mTrimTrailingWhitespace(false)
{}
~nsSVGGlyphFrame()
{
ClearTextRun();
}
public:
NS_DECL_QUERYFRAME
NS_DECL_FRAMEARENA_HELPERS
// These do not use the global transform if NS_STATE_NONDISPLAY_CHILD
nsresult GetStartPositionOfChar(uint32_t charnum, nsISupports **_retval);
nsresult GetEndPositionOfChar(uint32_t charnum, nsISupports **_retval);
nsresult GetExtentOfChar(uint32_t charnum, nsIDOMSVGRect **_retval);
nsresult GetRotationOfChar(uint32_t charnum, float *_retval);
/**
* @param aForceGlobalTransform controls whether to use the
* global transform even when NS_STATE_NONDISPLAY_CHILD
*/
float GetAdvance(bool aForceGlobalTransform);
void SetGlyphPosition(gfxPoint *aPosition, bool aForceGlobalTransform);
nsSVGTextPathFrame* FindTextPathParent();
bool IsStartOfChunk(); // == is new absolutely positioned chunk.
void GetXY(mozilla::SVGUserUnitList *aX, mozilla::SVGUserUnitList *aY);
void SetStartIndex(uint32_t aStartIndex);
/*
* Returns inherited x and y values instead of parent element's attribute
* values.
*/
void GetEffectiveXY(int32_t strLength,
nsTArray<float> &aX, nsTArray<float> &aY);
/*
* Returns inherited dx and dy values instead of parent element's attribute
* values.
*/
void GetEffectiveDxDy(int32_t strLength,
nsTArray<float> &aDx,
nsTArray<float> &aDy);
/*
* Returns inherited rotate values instead of parent element's attribute
* values.
*/
void GetEffectiveRotate(int32_t strLength,
nsTArray<float> &aRotate);
uint16_t GetTextAnchor();
bool IsAbsolutelyPositioned();
bool IsTextEmpty() const {
return mContent->GetText()->GetLength() == 0;
}
void SetTrimLeadingWhitespace(bool aTrimLeadingWhitespace) {
if (mTrimLeadingWhitespace != aTrimLeadingWhitespace) {
mTrimLeadingWhitespace = aTrimLeadingWhitespace;
ClearTextRun();
}
}
void SetTrimTrailingWhitespace(bool aTrimTrailingWhitespace) {
if (mTrimTrailingWhitespace != aTrimTrailingWhitespace) {
mTrimTrailingWhitespace = aTrimTrailingWhitespace;
ClearTextRun();
}
}
bool EndsWithWhitespace() const;
bool IsAllWhitespace() const;
// nsIFrame interface:
NS_IMETHOD CharacterDataChanged(CharacterDataChangeInfo* aInfo);
virtual void DidSetStyleContext(nsStyleContext* aOldStyleContext);
NS_IMETHOD IsSelectable(bool* aIsSelectable, uint8_t* aSelectStyle) const;
NS_IMETHOD Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow);
/**
* Get the "type" of the frame
*
* @see nsGkAtoms::svgGlyphFrame
*/
virtual nsIAtom* GetType() const;
virtual bool IsFrameOfType(uint32_t aFlags) const
{
// Set the frame state bit for text frames to mark them as replaced.
// XXX kipp: temporary
return nsSVGGlyphFrameBase::IsFrameOfType(aFlags & ~(nsIFrame::eReplaced));
}
#ifdef DEBUG
NS_IMETHOD GetFrameName(nsAString& aResult) const
{
return MakeFrameName(NS_LITERAL_STRING("SVGGlyph"), aResult);
}
#endif
NS_IMETHOD BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists);
// nsISVGChildFrame interface:
// These four always use the global transform, even if NS_STATE_NONDISPLAY_CHILD
NS_IMETHOD PaintSVG(nsRenderingContext *aContext,
const nsIntRect *aDirtyRect);
NS_IMETHOD_(nsIFrame*) GetFrameForPoint(const nsPoint &aPoint) MOZ_OVERRIDE;
virtual SVGBBox GetBBoxContribution(const gfxMatrix &aToBBoxUserspace,
uint32_t aFlags) MOZ_OVERRIDE;
NS_IMETHOD_(nsRect) GetCoveredRegion() MOZ_OVERRIDE;
virtual void ReflowSVG() MOZ_OVERRIDE;
virtual void NotifySVGChanged(uint32_t aFlags) MOZ_OVERRIDE;
NS_IMETHOD_(bool) IsDisplayContainer() MOZ_OVERRIDE { return false; }
// nsSVGGeometryFrame methods
gfxMatrix GetCanvasTM(uint32_t aFor);
// nsISVGGlyphFragmentNode interface:
// These do not use the global transform if NS_STATE_NONDISPLAY_CHILD
virtual uint32_t GetNumberOfChars();
virtual float GetComputedTextLength() MOZ_OVERRIDE;
virtual float GetSubStringLength(uint32_t charnum, uint32_t fragmentChars) MOZ_OVERRIDE;
virtual int32_t GetCharNumAtPosition(mozilla::nsISVGPoint *point) MOZ_OVERRIDE;
NS_IMETHOD_(nsSVGGlyphFrame *) GetFirstGlyphFrame() MOZ_OVERRIDE;
NS_IMETHOD_(nsSVGGlyphFrame *) GetNextGlyphFrame() MOZ_OVERRIDE;
NS_IMETHOD_(void) SetWhitespaceCompression(bool aCompressWhitespace) MOZ_OVERRIDE {
if (mCompressWhitespace != aCompressWhitespace) {
mCompressWhitespace = aCompressWhitespace;
ClearTextRun();
}
}
private:
/**
* This class exists purely because it would be too messy to pass the "for"
* flag for GetCanvasTM through the call chains to the GetCanvasTM() call in
* EnsureTextRun.
*/
class AutoCanvasTMForMarker {
public:
AutoCanvasTMForMarker(nsSVGGlyphFrame *aFrame, uint32_t aFor)
: mFrame(aFrame)
{
mOldFor = mFrame->mGetCanvasTMForFlag;
mFrame->mGetCanvasTMForFlag = aFor;
}
~AutoCanvasTMForMarker()
{
// Default
mFrame->mGetCanvasTMForFlag = mOldFor;
}
private:
nsSVGGlyphFrame *mFrame;
uint32_t mOldFor;
};
// Use a power of 2 here. It's not so important to match
// nsDeviceContext::AppUnitsPerDevPixel, but since we do a lot of
// multiplying by 1/GetTextRunUnitsFactor, it's good for it to be a
// power of 2 to avoid accuracy loss.
static uint32_t GetTextRunUnitsFactor() { return 64; }
/**
* @aParam aDrawScale font drawing must be scaled into user units
* by this factor
* @param aMetricsScale font metrics must be scaled into user units
* by this factor
* @param aForceGlobalTransform set to true if we should force use of
* the global transform; otherwise we won't use the global transform
* if we're a NONDISPLAY_CHILD
*/
bool EnsureTextRun(float *aDrawScale, float *aMetricsScale,
bool aForceGlobalTransform);
void ClearTextRun();
bool GetCharacterData(nsAString & aCharacterData);
bool GetCharacterPositions(nsTArray<CharacterPosition>* aCharacterPositions,
float aMetricsScale);
uint32_t GetTextRunFlags(uint32_t strLength);
void AddCharactersToPath(CharacterIterator *aIter,
gfxContext *aContext);
void AddBoundingBoxesToPath(CharacterIterator *aIter,
gfxContext *aContext);
void DrawCharacters(CharacterIterator *aIter,
gfxContext *aContext,
DrawMode aDrawMode,
gfxTextObjectPaint *aObjectPaint = nullptr);
void NotifyGlyphMetricsChange();
void SetupGlobalTransform(gfxContext *aContext, uint32_t aFor);
nsresult GetHighlight(uint32_t *charnum, uint32_t *nchars,
nscolor *foreground, nscolor *background);
float GetSubStringAdvance(uint32_t charnum, uint32_t fragmentChars,
float aMetricsScale);
gfxFloat GetBaselineOffset(float aMetricsScale);
virtual void GetDxDy(SVGUserUnitList *aDx, SVGUserUnitList *aDy);
virtual const SVGNumberList *GetRotate();
// Used to support GetBBoxContribution by making GetConvasTM use this as the
// parent transform instead of the real CanvasTM.
nsAutoPtr<gfxMatrix> mOverrideCanvasTM;
// Owning pointer, must call gfxTextRunWordCache::RemoveTextRun before deleting
gfxTextRun *mTextRun;
gfxPoint mPosition;
// The start index into the position and rotation data
uint32_t mStartIndex;
uint32_t mGetCanvasTMForFlag;
bool mCompressWhitespace;
bool mTrimLeadingWhitespace;
bool mTrimTrailingWhitespace;
private:
DrawMode SetupCairoState(gfxContext *aContext,
gfxTextObjectPaint *aOuterObjectPaint,
gfxTextObjectPaint **aThisObjectPaint);
// Slightly horrible callback for deferring application of opacity
struct SVGTextObjectPaint : public gfxTextObjectPaint {
already_AddRefed<gfxPattern> GetFillPattern(float aOpacity,
const gfxMatrix& aCTM);
already_AddRefed<gfxPattern> GetStrokePattern(float aOpacity,
const gfxMatrix& aCTM);
void SetFillOpacity(float aOpacity) { mFillOpacity = aOpacity; }
float GetFillOpacity() { return mFillOpacity; }
void SetStrokeOpacity(float aOpacity) { mStrokeOpacity = aOpacity; }
float GetStrokeOpacity() { return mStrokeOpacity; }
struct Paint {
Paint() {
mPatternCache.Init();
}
void SetPaintServer(nsIFrame *aFrame, const gfxMatrix& aContextMatrix,
nsSVGPaintServerFrame *aPaintServerFrame) {
mPaintType = eStyleSVGPaintType_Server;
mPaintDefinition.mPaintServerFrame = aPaintServerFrame;
mFrame = aFrame;
mContextMatrix = aContextMatrix;
}
void SetColor(const nscolor &aColor) {
mPaintType = eStyleSVGPaintType_Color;
mPaintDefinition.mColor = aColor;
}
void SetObjectPaint(gfxTextObjectPaint *aObjectPaint,
nsStyleSVGPaintType aPaintType) {
NS_ASSERTION(aPaintType == eStyleSVGPaintType_ObjectFill ||
aPaintType == eStyleSVGPaintType_ObjectStroke,
"Invalid object paint type");
mPaintType = aPaintType;
mPaintDefinition.mObjectPaint = aObjectPaint;
}
union {
nsSVGPaintServerFrame *mPaintServerFrame;
gfxTextObjectPaint *mObjectPaint;
nscolor mColor;
} mPaintDefinition;
nsIFrame *mFrame;
// CTM defining the user space for the pattern we will use.
gfxMatrix mContextMatrix;
nsStyleSVGPaintType mPaintType;
// Device-space-to-pattern-space
gfxMatrix mPatternMatrix;
nsRefPtrHashtable<nsFloatHashKey, gfxPattern> mPatternCache;
already_AddRefed<gfxPattern> GetPattern(float aOpacity,
nsStyleSVGPaint nsStyleSVG::*aFillOrStroke,
const gfxMatrix& aCTM);
};
Paint mFillPaint;
Paint mStrokePaint;
float mFillOpacity;
float mStrokeOpacity;
};
/**
* Sets up the stroke style in |aContext| and stores stroke pattern
* information in |aThisObjectPaint|.
*/
bool SetupCairoStroke(gfxContext *aContext,
gfxTextObjectPaint *aOuterObjectPaint,
SVGTextObjectPaint *aThisObjectPaint);
/**
* Sets up the fill style in |aContext| and stores fill pattern information
* in |aThisObjectPaint|.
*/
bool SetupCairoFill(gfxContext *aContext,
gfxTextObjectPaint *aOuterObjectPaint,
SVGTextObjectPaint *aThisObjectPaint);
/**
* Sets the current pattern to the fill or stroke style of the outer text
* object. Will also set the paint opacity to transparent if the paint is set
* to "none".
*/
bool SetupObjectPaint(gfxContext *aContext,
nsStyleSVGPaint nsStyleSVG::*aFillOrStroke,
float& aOpacity,
gfxTextObjectPaint *aObjectPaint);
/**
* Stores in |aTargetPaint| information on how to reconstruct the current
* fill or stroke pattern. Will also set the paint opacity to transparent if
* the paint is set to "none".
* @param aOuterObjectPaint pattern information from the outer text object
* @param aTargetPaint where to store the current pattern information
* @param aFillOrStroke member pointer to the paint we are setting up
* @param aProperty the frame property descriptor of the fill or stroke paint
* server frame
*/
void SetupInheritablePaint(gfxContext *aContext,
float& aOpacity,
gfxTextObjectPaint *aOuterObjectPaint,
SVGTextObjectPaint::Paint& aTargetPaint,
nsStyleSVGPaint nsStyleSVG::*aFillOrStroke,
const FramePropertyDescriptor *aProperty);
};
#endif