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gfx/thebes/gfxDWriteTextAnalysis.h@b8a032363ba2 (annotated)

gfx/thebes/gfxDWriteTextAnalysis.h

Thu, 22 Jan 2015 13:21:57 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Thu, 22 Jan 2015 13:21:57 +0100

branch

TOR_BUG_9701

changeset 15

b8a032363ba2

permissions

-rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

michael@0	1	/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
michael@0	2	* This Source Code Form is subject to the terms of the Mozilla Public
michael@0	3	* License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0	4	* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0	5
michael@0	6	#ifndef GFX_DWRITETEXTANALYSIS_H
michael@0	7	#define GFX_DWRITETEXTANALYSIS_H
michael@0	8
michael@0	9	#include "gfxDWriteCommon.h"
michael@0	10
michael@0	11	// Helper source/sink class for text analysis.
michael@0	12	class TextAnalysis
michael@0	13	: public IDWriteTextAnalysisSource,
michael@0	14	public IDWriteTextAnalysisSink
michael@0	15	{
michael@0	16	public:
michael@0	17
michael@0	18	// IUnknown interface
michael@0	19	IFACEMETHOD(QueryInterface)(IID const& iid, OUT void** ppObject)
michael@0	20	{
michael@0	21	if (iid == __uuidof(IDWriteTextAnalysisSource)) {
michael@0	22	*ppObject = static_cast<IDWriteTextAnalysisSource*>(this);
michael@0	23	return S_OK;
michael@0	24	} else if (iid == __uuidof(IDWriteTextAnalysisSink)) {
michael@0	25	*ppObject = static_cast<IDWriteTextAnalysisSink*>(this);
michael@0	26	return S_OK;
michael@0	27	} else if (iid == __uuidof(IUnknown)) {
michael@0	28	*ppObject =
michael@0	29	static_cast<IUnknown*>(static_cast<IDWriteTextAnalysisSource*>(this));
michael@0	30	return S_OK;
michael@0	31	} else {
michael@0	32	return E_NOINTERFACE;
michael@0	33	}
michael@0	34	}
michael@0	35
michael@0	36	IFACEMETHOD_(ULONG, AddRef)()
michael@0	37	{
michael@0	38	return 1;
michael@0	39	}
michael@0	40
michael@0	41	IFACEMETHOD_(ULONG, Release)()
michael@0	42	{
michael@0	43	return 1;
michael@0	44	}
michael@0	45
michael@0	46	// A single contiguous run of characters containing the same analysis
michael@0	47	// results.
michael@0	48	struct Run
michael@0	49	{
michael@0	50	UINT32 mTextStart; // starting text position of this run
michael@0	51	UINT32 mTextLength; // number of contiguous code units covered
michael@0	52	UINT32 mGlyphStart; // starting glyph in the glyphs array
michael@0	53	UINT32 mGlyphCount; // number of glyphs associated with this run of
michael@0	54	// text
michael@0	55	DWRITE_SCRIPT_ANALYSIS mScript;
michael@0	56	UINT8 mBidiLevel;
michael@0	57	bool mIsSideways;
michael@0	58
michael@0	59	inline bool ContainsTextPosition(UINT32 aTextPosition) const
michael@0	60	{
michael@0	61	return aTextPosition >= mTextStart
michael@0	62	&& aTextPosition < mTextStart + mTextLength;
michael@0	63	}
michael@0	64
michael@0	65	Run *nextRun;
michael@0	66	};
michael@0	67
michael@0	68	public:
michael@0	69	TextAnalysis(const wchar_t* text,
michael@0	70	UINT32 textLength,
michael@0	71	const wchar_t* localeName,
michael@0	72	DWRITE_READING_DIRECTION readingDirection);
michael@0	73
michael@0	74	~TextAnalysis();
michael@0	75
michael@0	76	STDMETHODIMP GenerateResults(IDWriteTextAnalyzer* textAnalyzer,
michael@0	77	Run **runHead);
michael@0	78
michael@0	79	// IDWriteTextAnalysisSource implementation
michael@0	80
michael@0	81	IFACEMETHODIMP GetTextAtPosition(UINT32 textPosition,
michael@0	82	OUT WCHAR const** textString,
michael@0	83	OUT UINT32* textLength);
michael@0	84
michael@0	85	IFACEMETHODIMP GetTextBeforePosition(UINT32 textPosition,
michael@0	86	OUT WCHAR const** textString,
michael@0	87	OUT UINT32* textLength);
michael@0	88
michael@0	89	IFACEMETHODIMP_(DWRITE_READING_DIRECTION)
michael@0	90	GetParagraphReadingDirection() throw();
michael@0	91
michael@0	92	IFACEMETHODIMP GetLocaleName(UINT32 textPosition,
michael@0	93	OUT UINT32* textLength,
michael@0	94	OUT WCHAR const** localeName);
michael@0	95
michael@0	96	IFACEMETHODIMP
michael@0	97	GetNumberSubstitution(UINT32 textPosition,
michael@0	98	OUT UINT32* textLength,
michael@0	99	OUT IDWriteNumberSubstitution** numberSubstitution);
michael@0	100
michael@0	101	// IDWriteTextAnalysisSink implementation
michael@0	102
michael@0	103	IFACEMETHODIMP
michael@0	104	SetScriptAnalysis(UINT32 textPosition,
michael@0	105	UINT32 textLength,
michael@0	106	DWRITE_SCRIPT_ANALYSIS const* scriptAnalysis);
michael@0	107
michael@0	108	IFACEMETHODIMP
michael@0	109	SetLineBreakpoints(UINT32 textPosition,
michael@0	110	UINT32 textLength,
michael@0	111	const DWRITE_LINE_BREAKPOINT* lineBreakpoints);
michael@0	112
michael@0	113	IFACEMETHODIMP SetBidiLevel(UINT32 textPosition,
michael@0	114	UINT32 textLength,
michael@0	115	UINT8 explicitLevel,
michael@0	116	UINT8 resolvedLevel);
michael@0	117
michael@0	118	IFACEMETHODIMP
michael@0	119	SetNumberSubstitution(UINT32 textPosition,
michael@0	120	UINT32 textLength,
michael@0	121	IDWriteNumberSubstitution* numberSubstitution);
michael@0	122
michael@0	123	protected:
michael@0	124	Run *FetchNextRun(IN OUT UINT32* textLength);
michael@0	125
michael@0	126	void SetCurrentRun(UINT32 textPosition);
michael@0	127
michael@0	128	void SplitCurrentRun(UINT32 splitPosition);
michael@0	129
michael@0	130	protected:
michael@0	131	// Input
michael@0	132	// (weak references are fine here, since this class is a transient
michael@0	133	// stack-based helper that doesn't need to copy data)
michael@0	134	UINT32 mTextLength;
michael@0	135	const wchar_t* mText;
michael@0	136	const wchar_t* mLocaleName;
michael@0	137	DWRITE_READING_DIRECTION mReadingDirection;
michael@0	138
michael@0	139	// Current processing state.
michael@0	140	Run *mCurrentRun;
michael@0	141
michael@0	142	// Output is a list of runs starting here
michael@0	143	Run mRunHead;
michael@0	144	};
michael@0	145
michael@0	146	#endif /* GFX_DWRITETEXTANALYSIS_H */