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gecko-dev/layout/generic/nsTextFrame.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 nsTextFrame_h__
#define nsTextFrame_h__
#include "mozilla/Attributes.h"
#include "mozilla/EventForwards.h"
#include "mozilla/gfx/2D.h"
#include "nsFrame.h"
#include "nsSplittableFrame.h"
#include "nsLineBox.h"
#include "gfxSkipChars.h"
#include "gfxTextRun.h"
#include "nsDisplayList.h"
#include "JustificationUtils.h"
#include "RubyUtils.h"
// Undo the windows.h damage
#if defined(XP_WIN) && defined(DrawText)
#undef DrawText
#endif
class nsTextPaintStyle;
class PropertyProvider;
struct SelectionDetails;
class nsTextFragment;
class nsDisplayTextGeometry;
class nsDisplayText;
namespace mozilla {
class SVGContextPaint;
};
class nsTextFrame : public nsFrame {
typedef mozilla::LayoutDeviceRect LayoutDeviceRect;
typedef mozilla::RawSelectionType RawSelectionType;
typedef mozilla::SelectionType SelectionType;
typedef mozilla::TextRangeStyle TextRangeStyle;
typedef mozilla::gfx::DrawTarget DrawTarget;
typedef mozilla::gfx::Point Point;
typedef mozilla::gfx::Rect Rect;
typedef mozilla::gfx::Size Size;
typedef gfxTextRun::Range Range;
public:
NS_DECL_QUERYFRAME_TARGET(nsTextFrame)
NS_DECL_FRAMEARENA_HELPERS
friend class nsContinuingTextFrame;
friend class nsDisplayTextGeometry;
friend class nsDisplayText;
explicit nsTextFrame(nsStyleContext* aContext)
: nsFrame(aContext)
{
NS_ASSERTION(mContentOffset == 0, "Bogus content offset");
}
// nsQueryFrame
NS_DECL_QUERYFRAME
// nsIFrame
virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists) override;
virtual void Init(nsIContent* aContent,
nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) override;
virtual void DestroyFrom(nsIFrame* aDestructRoot) override;
virtual nsresult GetCursor(const nsPoint& aPoint,
nsIFrame::Cursor& aCursor) override;
virtual nsresult CharacterDataChanged(CharacterDataChangeInfo* aInfo) override;
virtual nsIFrame* GetNextContinuation() const override {
return mNextContinuation;
}
virtual void SetNextContinuation(nsIFrame* aNextContinuation) override {
NS_ASSERTION (!aNextContinuation || GetType() == aNextContinuation->GetType(),
"setting a next continuation with incorrect type!");
NS_ASSERTION (!nsSplittableFrame::IsInNextContinuationChain(aNextContinuation, this),
"creating a loop in continuation chain!");
mNextContinuation = aNextContinuation;
if (aNextContinuation)
aNextContinuation->RemoveStateBits(NS_FRAME_IS_FLUID_CONTINUATION);
}
virtual nsIFrame* GetNextInFlowVirtual() const override { return GetNextInFlow(); }
nsIFrame* GetNextInFlow() const {
return mNextContinuation && (mNextContinuation->GetStateBits() & NS_FRAME_IS_FLUID_CONTINUATION) ?
mNextContinuation : nullptr;
}
virtual void SetNextInFlow(nsIFrame* aNextInFlow) override {
NS_ASSERTION (!aNextInFlow || GetType() == aNextInFlow->GetType(),
"setting a next in flow with incorrect type!");
NS_ASSERTION (!nsSplittableFrame::IsInNextContinuationChain(aNextInFlow, this),
"creating a loop in continuation chain!");
mNextContinuation = aNextInFlow;
if (aNextInFlow)
aNextInFlow->AddStateBits(NS_FRAME_IS_FLUID_CONTINUATION);
}
virtual nsIFrame* LastInFlow() const override;
virtual nsIFrame* LastContinuation() const override;
virtual nsSplittableType GetSplittableType() const override {
return NS_FRAME_SPLITTABLE;
}
/**
* Get the "type" of the frame
*
* @see nsGkAtoms::textFrame
*/
virtual nsIAtom* GetType() const override;
virtual bool IsFrameOfType(uint32_t aFlags) const override
{
// Set the frame state bit for text frames to mark them as replaced.
// XXX kipp: temporary
return nsFrame::IsFrameOfType(aFlags & ~(nsIFrame::eReplaced |
nsIFrame::eLineParticipant));
}
bool ShouldSuppressLineBreak() const
{
// If the parent frame of the text frame is ruby content box, it must
// suppress line break inside. This check is necessary, because when
// a whitespace is only contained by pseudo ruby frames, its style
// context won't have SuppressLineBreak bit set.
if (mozilla::RubyUtils::IsRubyContentBox(GetParent()->GetType())) {
return true;
}
return StyleContext()->ShouldSuppressLineBreak();
}
virtual void InvalidateFrame(uint32_t aDisplayItemKey = 0) override;
virtual void InvalidateFrameWithRect(const nsRect& aRect, uint32_t aDisplayItemKey = 0) override;
#ifdef DEBUG_FRAME_DUMP
void List(FILE* out = stderr, const char* aPrefix = "", uint32_t aFlags = 0) const override;
virtual nsresult GetFrameName(nsAString& aResult) const override;
void ToCString(nsCString& aBuf, int32_t* aTotalContentLength) const;
#endif
#ifdef DEBUG
virtual nsFrameState GetDebugStateBits() const override;
#endif
virtual ContentOffsets CalcContentOffsetsFromFramePoint(nsPoint aPoint) override;
ContentOffsets GetCharacterOffsetAtFramePoint(const nsPoint &aPoint);
/**
* This is called only on the primary text frame. It indicates that
* the selection state of the given character range has changed.
* Text in the range is unconditionally invalidated
* (Selection::Repaint depends on this).
* @param aSelected true if the selection has been added to the range,
* false otherwise
* @param aType the type of selection added or removed
*/
void SetSelectedRange(uint32_t aStart, uint32_t aEnd, bool aSelected,
SelectionType aSelectionType);
virtual FrameSearchResult PeekOffsetNoAmount(bool aForward, int32_t* aOffset) override;
virtual FrameSearchResult PeekOffsetCharacter(bool aForward, int32_t* aOffset,
bool aRespectClusters = true) override;
virtual FrameSearchResult PeekOffsetWord(bool aForward, bool aWordSelectEatSpace, bool aIsKeyboardSelect,
int32_t* aOffset, PeekWordState* aState) override;
virtual nsresult CheckVisibility(nsPresContext* aContext, int32_t aStartIndex, int32_t aEndIndex, bool aRecurse, bool *aFinished, bool *_retval) override;
// Flags for aSetLengthFlags
enum { ALLOW_FRAME_CREATION_AND_DESTRUCTION = 0x01 };
// Update offsets to account for new length. This may clear mTextRun.
void SetLength(int32_t aLength, nsLineLayout* aLineLayout,
uint32_t aSetLengthFlags = 0);
virtual nsresult GetOffsets(int32_t &start, int32_t &end)const override;
virtual void AdjustOffsetsForBidi(int32_t start, int32_t end) override;
virtual nsresult GetPointFromOffset(int32_t inOffset,
nsPoint* outPoint) override;
virtual nsresult GetCharacterRectsInRange(int32_t aInOffset,
int32_t aLength,
nsTArray<nsRect>& aRects) override;
virtual nsresult GetChildFrameContainingOffset(int32_t inContentOffset,
bool inHint,
int32_t* outFrameContentOffset,
nsIFrame** outChildFrame) override;
virtual bool IsVisibleInSelection(nsISelection* aSelection) override;
virtual bool IsEmpty() override;
virtual bool IsSelfEmpty() override { return IsEmpty(); }
nscoord GetLogicalBaseline(mozilla::WritingMode aWritingMode) const final;
virtual bool HasSignificantTerminalNewline() const override;
/**
* Returns true if this text frame is logically adjacent to the end of the
* line.
*/
bool IsAtEndOfLine() const;
/**
* Call this only after reflow the frame. Returns true if non-collapsed
* characters are present.
*/
bool HasNoncollapsedCharacters() const {
return (GetStateBits() & TEXT_HAS_NONCOLLAPSED_CHARACTERS) != 0;
}
#ifdef ACCESSIBILITY
virtual mozilla::a11y::AccType AccessibleType() override;
#endif
float GetFontSizeInflation() const;
bool IsCurrentFontInflation(float aInflation) const;
bool HasFontSizeInflation() const {
return (GetStateBits() & TEXT_HAS_FONT_INFLATION) != 0;
}
void SetFontSizeInflation(float aInflation);
virtual void MarkIntrinsicISizesDirty() override;
virtual nscoord GetMinISize(nsRenderingContext *aRenderingContext) override;
virtual nscoord GetPrefISize(nsRenderingContext *aRenderingContext) override;
virtual void AddInlineMinISize(nsRenderingContext *aRenderingContext,
InlineMinISizeData *aData) override;
virtual void AddInlinePrefISize(nsRenderingContext *aRenderingContext,
InlinePrefISizeData *aData) override;
virtual mozilla::LogicalSize
ComputeSize(nsRenderingContext *aRenderingContext,
mozilla::WritingMode aWritingMode,
const mozilla::LogicalSize& aCBSize,
nscoord aAvailableISize,
const mozilla::LogicalSize& aMargin,
const mozilla::LogicalSize& aBorder,
const mozilla::LogicalSize& aPadding,
ComputeSizeFlags aFlags) override;
virtual nsRect ComputeTightBounds(DrawTarget* aDrawTarget) const override;
virtual nsresult GetPrefWidthTightBounds(nsRenderingContext* aContext,
nscoord* aX,
nscoord* aXMost) override;
virtual void Reflow(nsPresContext* aPresContext,
ReflowOutput& aMetrics,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus) override;
virtual bool CanContinueTextRun() const override;
// Method that is called for a text frame that is logically
// adjacent to the end of the line (i.e. followed only by empty text frames,
// placeholders or inlines containing such).
struct TrimOutput {
// true if we trimmed some space or changed metrics in some other way.
// In this case, we should call RecomputeOverflow on this frame.
bool mChanged;
// an amount to *subtract* from the frame's width (zero if !mChanged)
nscoord mDeltaWidth;
};
TrimOutput TrimTrailingWhiteSpace(DrawTarget* aDrawTarget);
virtual RenderedText GetRenderedText(uint32_t aStartOffset = 0,
uint32_t aEndOffset = UINT32_MAX,
TextOffsetType aOffsetType =
TextOffsetType::OFFSETS_IN_CONTENT_TEXT,
TrailingWhitespace aTrimTrailingWhitespace =
TrailingWhitespace::TRIM_TRAILING_WHITESPACE) override;
nsOverflowAreas RecomputeOverflow(nsIFrame* aBlockFrame);
enum TextRunType {
// Anything in reflow (but not intrinsic width calculation) or
// painting should use the inflated text run (i.e., with font size
// inflation applied).
eInflated,
// Intrinsic width calculation should use the non-inflated text run.
// When there is font size inflation, it will be different.
eNotInflated
};
void AddInlineMinISizeForFlow(nsRenderingContext *aRenderingContext,
nsIFrame::InlineMinISizeData *aData,
TextRunType aTextRunType);
void AddInlinePrefISizeForFlow(nsRenderingContext *aRenderingContext,
InlinePrefISizeData *aData,
TextRunType aTextRunType);
/**
* Calculate the horizontal bounds of the grapheme clusters that fit entirely
* inside the given left[top]/right[bottom] edges (which are positive lengths
* from the respective frame edge). If an input value is zero it is ignored
* and the result for that edge is zero. All out parameter values are
* undefined when the method returns false.
* @return true if at least one whole grapheme cluster fit between the edges
*/
bool MeasureCharClippedText(nscoord aVisIStartEdge, nscoord aVisIEndEdge,
nscoord* aSnappedStartEdge,
nscoord* aSnappedEndEdge);
/**
* Same as above; this method also the returns the corresponding text run
* offset and number of characters that fit. All out parameter values are
* undefined when the method returns false.
* @return true if at least one whole grapheme cluster fit between the edges
*/
bool MeasureCharClippedText(PropertyProvider& aProvider,
nscoord aVisIStartEdge, nscoord aVisIEndEdge,
uint32_t* aStartOffset, uint32_t* aMaxLength,
nscoord* aSnappedStartEdge,
nscoord* aSnappedEndEdge);
/**
* Object with various callbacks for PaintText() to invoke for different parts
* of the frame's text rendering, when we're generating paths rather than
* painting.
*
* Callbacks are invoked in the following order:
*
* NotifySelectionBackgroundNeedsFill?
* PaintDecorationLine*
* NotifyBeforeText
* NotifyGlyphPathEmitted*
* NotifyAfterText
* PaintDecorationLine*
* PaintSelectionDecorationLine*
*
* The color of each part of the frame's text rendering is passed as an argument
* to the NotifyBefore* callback for that part. The nscolor can take on one of
* the three selection special colors defined in LookAndFeel.h --
* NS_TRANSPARENT, NS_SAME_AS_FOREGROUND_COLOR and
* NS_40PERCENT_FOREGROUND_COLOR.
*/
struct DrawPathCallbacks : gfxTextRunDrawCallbacks
{
/**
* @param aShouldPaintSVGGlyphs Whether SVG glyphs should be painted.
*/
explicit DrawPathCallbacks(bool aShouldPaintSVGGlyphs = false)
: gfxTextRunDrawCallbacks(aShouldPaintSVGGlyphs)
{
}
/**
* Called to have the selection highlight drawn before the text is drawn
* over the top.
*/
virtual void NotifySelectionBackgroundNeedsFill(const Rect& aBackgroundRect,
nscolor aColor,
DrawTarget& aDrawTarget) { }
/**
* Called before (for under/over-line) or after (for line-through) the text
* is drawn to have a text decoration line drawn.
*/
virtual void PaintDecorationLine(Rect aPath, nscolor aColor) { }
/**
* Called after selected text is drawn to have a decoration line drawn over
* the text. (All types of text decoration are drawn after the text when
* text is selected.)
*/
virtual void PaintSelectionDecorationLine(Rect aPath, nscolor aColor) { }
/**
* Called just before any paths have been emitted to the gfxContext
* for the glyphs of the frame's text.
*/
virtual void NotifyBeforeText(nscolor aColor) { }
/**
* Called just after all the paths have been emitted to the gfxContext
* for the glyphs of the frame's text.
*/
virtual void NotifyAfterText() { }
/**
* Called just before a path corresponding to a selection decoration line
* has been emitted to the gfxContext.
*/
virtual void NotifyBeforeSelectionDecorationLine(nscolor aColor) { }
/**
* Called just after a path corresponding to a selection decoration line
* has been emitted to the gfxContext.
*/
virtual void NotifySelectionDecorationLinePathEmitted() { }
};
struct PaintTextParams
{
gfxContext* context;
gfxPoint framePt;
LayoutDeviceRect dirtyRect;
mozilla::SVGContextPaint* contextPaint = nullptr;
DrawPathCallbacks* callbacks = nullptr;
enum {
PaintText, // Normal text painting.
PaintTextBGColor, // Only paint background color of the selected text
// range in this state.
GenerateTextMask // To generate a mask from a text frame. Should
// only paint text itself with opaque color.
// Text shadow, text selection color and text
// decoration are all discarded in this state.
};
uint8_t state = PaintText;
explicit PaintTextParams(gfxContext* aContext) : context(aContext) {}
bool IsPaintText() const { return state == PaintText; }
bool IsGenerateTextMask() const { return state == GenerateTextMask; }
bool IsPaintBGColor() const { return state == PaintTextBGColor; }
};
struct PaintTextSelectionParams : PaintTextParams
{
gfxPoint textBaselinePt;
PropertyProvider* provider = nullptr;
Range contentRange;
nsTextPaintStyle* textPaintStyle = nullptr;
explicit PaintTextSelectionParams(const PaintTextParams& aParams)
: PaintTextParams(aParams) {}
};
struct DrawTextRunParams
{
gfxContext* context;
PropertyProvider* provider = nullptr;
gfxFloat* advanceWidth = nullptr;
mozilla::SVGContextPaint* contextPaint = nullptr;
DrawPathCallbacks* callbacks = nullptr;
nscolor textColor = NS_RGBA(0, 0, 0, 0);
nscolor textStrokeColor = NS_RGBA(0, 0, 0, 0);
float textStrokeWidth = 0.0f;
bool drawSoftHyphen = false;
explicit DrawTextRunParams(gfxContext* aContext)
: context(aContext) {}
};
struct DrawTextParams : DrawTextRunParams
{
gfxPoint framePt;
LayoutDeviceRect dirtyRect;
const nsTextPaintStyle* textStyle = nullptr;
const nsCharClipDisplayItem::ClipEdges* clipEdges = nullptr;
const nscolor* decorationOverrideColor = nullptr;
explicit DrawTextParams(gfxContext* aContext)
: DrawTextRunParams(aContext) {}
};
// Primary frame paint method called from nsDisplayText. Can also be used
// to generate paths rather than paint the frame's text by passing a callback
// object. The private DrawText() is what applies the text to a graphics
// context.
void PaintText(const PaintTextParams& aParams,
const nsCharClipDisplayItem& aItem,
float aOpacity = 1.0f);
// helper: paint text frame when we're impacted by at least one selection.
// Return false if the text was not painted and we should continue with
// the fast path.
bool PaintTextWithSelection(const PaintTextSelectionParams& aParams,
const nsCharClipDisplayItem::ClipEdges& aClipEdges);
// helper: paint text with foreground and background colors determined
// by selection(s). Also computes a mask of all selection types applying to
// our text, returned in aAllTypes.
// Return false if the text was not painted and we should continue with
// the fast path.
bool PaintTextWithSelectionColors(
const PaintTextSelectionParams& aParams,
SelectionDetails* aDetails,
RawSelectionType* aAllRawSelectionTypes,
const nsCharClipDisplayItem::ClipEdges& aClipEdges);
// helper: paint text decorations for text selected by aSelectionType
void PaintTextSelectionDecorations(const PaintTextSelectionParams& aParams,
SelectionDetails* aDetails,
SelectionType aSelectionType);
void DrawEmphasisMarks(gfxContext* aContext,
mozilla::WritingMode aWM,
const gfxPoint& aTextBaselinePt,
const gfxPoint& aFramePt, Range aRange,
const nscolor* aDecorationOverrideColor,
PropertyProvider* aProvider);
virtual nscolor GetCaretColorAt(int32_t aOffset) override;
int16_t GetSelectionStatus(int16_t* aSelectionFlags);
int32_t GetContentOffset() const { return mContentOffset; }
int32_t GetContentLength() const
{
NS_ASSERTION(GetContentEnd() - mContentOffset >= 0, "negative length");
return GetContentEnd() - mContentOffset;
}
int32_t GetContentEnd() const;
// This returns the length the frame thinks it *should* have after it was
// last reflowed (0 if it hasn't been reflowed yet). This should be used only
// when setting up the text offsets for a new continuation frame.
int32_t GetContentLengthHint() const { return mContentLengthHint; }
// Compute the length of the content mapped by this frame
// and all its in-flow siblings. Basically this means starting at mContentOffset
// and going to the end of the text node or the next bidi continuation
// boundary.
int32_t GetInFlowContentLength();
/**
* Acquires the text run for this content, if necessary.
* @param aWhichTextRun indicates whether to get an inflated or non-inflated
* text run
* @param aRefDrawTarget the DrawTarget to use as a reference for creating the
* textrun, if available (if not, we'll create one which will just be slower)
* @param aLineContainer the block ancestor for this frame, or nullptr if
* unknown
* @param aFlowEndInTextRun if non-null, this returns the textrun offset of
* end of the text associated with this frame and its in-flow siblings
* @return a gfxSkipCharsIterator set up to map DOM offsets for this frame
* to offsets into the textrun; its initial offset is set to this frame's
* content offset
*/
gfxSkipCharsIterator EnsureTextRun(TextRunType aWhichTextRun,
DrawTarget* aRefDrawTarget = nullptr,
nsIFrame* aLineContainer = nullptr,
const nsLineList::iterator* aLine = nullptr,
uint32_t* aFlowEndInTextRun = nullptr);
gfxTextRun* GetTextRun(TextRunType aWhichTextRun) {
if (aWhichTextRun == eInflated || !HasFontSizeInflation())
return mTextRun;
return GetUninflatedTextRun();
}
gfxTextRun* GetUninflatedTextRun();
void SetTextRun(gfxTextRun* aTextRun, TextRunType aWhichTextRun,
float aInflation);
bool IsInTextRunUserData() const {
return GetStateBits() &
(TEXT_IN_TEXTRUN_USER_DATA | TEXT_IN_UNINFLATED_TEXTRUN_USER_DATA);
}
/**
* Notify the frame that it should drop its pointer to a text run.
* Returns whether the text run was removed (i.e., whether it was
* associated with this frame, either as its inflated or non-inflated
* text run.
*/
bool RemoveTextRun(gfxTextRun* aTextRun);
/**
* Clears out |mTextRun| (or the uninflated text run, when aInflated
* is nsTextFrame::eNotInflated and there is inflation) from all frames that hold a
* reference to it, starting at |aStartContinuation|, or if it's
* nullptr, starting at |this|. Deletes the text run if all references
* were cleared and it's not cached.
*/
void ClearTextRun(nsTextFrame* aStartContinuation,
TextRunType aWhichTextRun);
void ClearTextRuns() {
ClearTextRun(nullptr, nsTextFrame::eInflated);
if (HasFontSizeInflation()) {
ClearTextRun(nullptr, nsTextFrame::eNotInflated);
}
}
/**
* Wipe out references to textrun(s) without deleting the textruns.
*/
void DisconnectTextRuns();
// Get the DOM content range mapped by this frame after excluding
// whitespace subject to start-of-line and end-of-line trimming.
// The textrun must have been created before calling this.
struct TrimmedOffsets {
int32_t mStart;
int32_t mLength;
int32_t GetEnd() const { return mStart + mLength; }
};
TrimmedOffsets GetTrimmedOffsets(const nsTextFragment* aFrag,
bool aTrimAfter, bool aPostReflow = true);
// Similar to Reflow(), but for use from nsLineLayout
void ReflowText(nsLineLayout& aLineLayout, nscoord aAvailableWidth,
DrawTarget* aDrawTarget,
ReflowOutput& aMetrics, nsReflowStatus& aStatus);
bool IsFloatingFirstLetterChild() const;
virtual bool ComputeCustomOverflow(nsOverflowAreas& aOverflowAreas) override;
void AssignJustificationGaps(const mozilla::JustificationAssignment& aAssign);
mozilla::JustificationAssignment GetJustificationAssignment() const;
uint32_t CountGraphemeClusters() const;
protected:
virtual ~nsTextFrame();
gfxTextRun* mTextRun;
nsIFrame* mNextContinuation;
// The key invariant here is that mContentOffset never decreases along
// a next-continuation chain. And of course mContentOffset is always <= the
// the text node's content length, and the mContentOffset for the first frame
// is always 0. Furthermore the text mapped by a frame is determined by
// GetContentOffset() and GetContentLength()/GetContentEnd(), which get
// the length from the difference between this frame's offset and the next
// frame's offset, or the text length if there is no next frame. This means
// the frames always map the text node without overlapping or leaving any gaps.
int32_t mContentOffset;
// This does *not* indicate the length of text currently mapped by the frame;
// instead it's a hint saying that this frame *wants* to map this much text
// so if we create a new continuation, this is where that continuation should
// start.
int32_t mContentLengthHint;
nscoord mAscent;
/**
* Return true if the frame is part of a Selection.
* Helper method to implement the public IsSelected() API.
*/
virtual bool IsFrameSelected() const override;
// The caller of this method must call DestroySelectionDetails() on the
// return value, if that return value is not null. Calling
// DestroySelectionDetails() on a null value is still OK, just not necessary.
SelectionDetails* GetSelectionDetails();
void UnionAdditionalOverflow(nsPresContext* aPresContext,
nsIFrame* aBlock,
PropertyProvider& aProvider,
nsRect* aVisualOverflowRect,
bool aIncludeTextDecorations);
// Update information of emphasis marks, and return the visial
// overflow rect of the emphasis marks.
nsRect UpdateTextEmphasis(mozilla::WritingMode aWM,
PropertyProvider& aProvider);
struct PaintShadowParams
{
gfxTextRun::Range range;
LayoutDeviceRect dirtyRect;
gfxPoint framePt;
gfxPoint textBaselinePt;
gfxContext* context;
nscolor foregroundColor = NS_RGBA(0, 0, 0, 0);
const nsCharClipDisplayItem::ClipEdges* clipEdges = nullptr;
PropertyProvider* provider = nullptr;
nscoord leftSideOffset = 0;
explicit PaintShadowParams(const PaintTextParams& aParams)
: dirtyRect(aParams.dirtyRect)
, framePt(aParams.framePt)
, context(aParams.context) {}
};
void PaintOneShadow(const PaintShadowParams& aParams,
nsCSSShadowItem* aShadowDetails,
gfxRect& aBoundingBox,
uint32_t aBlurFlags);
void PaintShadows(nsCSSShadowArray* aShadow,
const PaintShadowParams& aParams);
struct LineDecoration {
nsIFrame* mFrame;
// This is represents the offset from our baseline to mFrame's baseline;
// positive offsets are *above* the baseline and negative offsets below
nscoord mBaselineOffset;
nscolor mColor;
uint8_t mStyle;
LineDecoration(nsIFrame *const aFrame,
const nscoord aOff,
const nscolor aColor,
const uint8_t aStyle)
: mFrame(aFrame),
mBaselineOffset(aOff),
mColor(aColor),
mStyle(aStyle)
{}
LineDecoration(const LineDecoration& aOther)
: mFrame(aOther.mFrame),
mBaselineOffset(aOther.mBaselineOffset),
mColor(aOther.mColor),
mStyle(aOther.mStyle)
{}
bool operator==(const LineDecoration& aOther) const {
return mFrame == aOther.mFrame &&
mStyle == aOther.mStyle &&
mColor == aOther.mColor &&
mBaselineOffset == aOther.mBaselineOffset;
}
bool operator!=(const LineDecoration& aOther) const {
return !(*this == aOther);
}
};
struct TextDecorations {
AutoTArray<LineDecoration, 1> mOverlines, mUnderlines, mStrikes;
TextDecorations() { }
bool HasDecorationLines() const {
return HasUnderline() || HasOverline() || HasStrikeout();
}
bool HasUnderline() const {
return !mUnderlines.IsEmpty();
}
bool HasOverline() const {
return !mOverlines.IsEmpty();
}
bool HasStrikeout() const {
return !mStrikes.IsEmpty();
}
bool operator==(const TextDecorations& aOther) const {
return mOverlines == aOther.mOverlines &&
mUnderlines == aOther.mUnderlines &&
mStrikes == aOther.mStrikes;
}
bool operator!=(const TextDecorations& aOther) const {
return !(*this == aOther);
}
};
enum TextDecorationColorResolution {
eResolvedColors,
eUnresolvedColors
};
void GetTextDecorations(nsPresContext* aPresContext,
TextDecorationColorResolution aColorResolution,
TextDecorations& aDecorations);
void DrawTextRun(Range aRange, const gfxPoint& aTextBaselinePt,
const DrawTextRunParams& aParams);
void DrawTextRunAndDecorations(Range aRange, const gfxPoint& aTextBaselinePt,
const DrawTextParams& aParams,
const TextDecorations& aDecorations);
void DrawText(Range aRange, const gfxPoint& aTextBaselinePt,
const DrawTextParams& aParams);
// Set non empty rect to aRect, it should be overflow rect or frame rect.
// If the result rect is larger than the given rect, this returns true.
bool CombineSelectionUnderlineRect(nsPresContext* aPresContext,
nsRect& aRect);
/**
* Utility methods to paint selection.
*/
void DrawSelectionDecorations(gfxContext* aContext,
const LayoutDeviceRect& aDirtyRect,
mozilla::SelectionType aSelectionType,
nsTextPaintStyle& aTextPaintStyle,
const TextRangeStyle &aRangeStyle,
const Point& aPt,
gfxFloat aICoordInFrame,
gfxFloat aWidth,
gfxFloat aAscent,
const gfxFont::Metrics& aFontMetrics,
DrawPathCallbacks* aCallbacks,
bool aVertical,
gfxFloat aDecorationOffsetDir,
uint8_t aDecoration);
struct PaintDecorationLineParams;
void PaintDecorationLine(const PaintDecorationLineParams& aParams);
/**
* ComputeDescentLimitForSelectionUnderline() computes the most far position
* where we can put selection underline.
*
* @return The maximum underline offset from the baseline (positive value
* means that the underline can put below the baseline).
*/
gfxFloat ComputeDescentLimitForSelectionUnderline(
nsPresContext* aPresContext,
const gfxFont::Metrics& aFontMetrics);
/**
* This function encapsulates all knowledge of how selections affect
* foreground and background colors.
* @param aForeground the foreground color to use
* @param aBackground the background color to use, or RGBA(0,0,0,0) if no
* background should be painted
* @return true if the selection affects colors, false otherwise
*/
static bool GetSelectionTextColors(SelectionType aSelectionType,
nsTextPaintStyle& aTextPaintStyle,
const TextRangeStyle &aRangeStyle,
nscolor* aForeground,
nscolor* aBackground);
/**
* ComputeSelectionUnderlineHeight() computes selection underline height of
* the specified selection type from the font metrics.
*/
static gfxFloat ComputeSelectionUnderlineHeight(
nsPresContext* aPresContext,
const gfxFont::Metrics& aFontMetrics,
SelectionType aSelectionType);
ContentOffsets GetCharacterOffsetAtFramePointInternal(nsPoint aPoint,
bool aForInsertionPoint);
void ClearFrameOffsetCache();
virtual bool HasAnyNoncollapsedCharacters() override;
void ClearMetrics(ReflowOutput& aMetrics);
/**
* UpdateIteratorFromOffset() updates the iterator from a given offset.
* Also, aInOffset may be updated to cluster start if aInOffset isn't
* the offset of cluster start.
*/
void UpdateIteratorFromOffset(const PropertyProvider& aProperties,
int32_t& aInOffset,
gfxSkipCharsIterator& aIter);
nsPoint GetPointFromIterator(const gfxSkipCharsIterator& aIter,
PropertyProvider& aProperties);
};
#endif
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