mirror of
https://github.com/classilla/tenfourfox.git
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176 lines
6.3 KiB
C++
176 lines
6.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef NSTEXTFRAMEUTILS_H_
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#define NSTEXTFRAMEUTILS_H_
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#include "gfxSkipChars.h"
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#include "nsBidiUtils.h"
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#include "nsUnicodeProperties.h"
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class nsIContent;
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struct nsStyleText;
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#define BIG_TEXT_NODE_SIZE 4096
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#define CH_NBSP 160
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#define CH_SHY 173
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#define CH_CJKSP 12288 // U+3000 IDEOGRAPHIC SPACE (CJK Full-Width Space)
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class nsTextFrameUtils {
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public:
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// These constants are used as textrun flags for textframe textruns.
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enum {
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// The following flags are set by TransformText
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// the text has at least one untransformed tab character
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TEXT_HAS_TAB = 0x010000,
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// the original text has at least one soft hyphen character
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TEXT_HAS_SHY = 0x020000,
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TEXT_WAS_TRANSFORMED = 0x040000,
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TEXT_UNUSED_FLAG = 0x080000,
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// The following flags are set by nsTextFrame
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TEXT_IS_SIMPLE_FLOW = 0x100000,
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TEXT_INCOMING_WHITESPACE = 0x200000,
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TEXT_TRAILING_WHITESPACE = 0x400000,
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TEXT_COMPRESSED_LEADING_WHITESPACE = 0x800000,
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TEXT_NO_BREAKS = 0x1000000,
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TEXT_IS_TRANSFORMED = 0x2000000,
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// This gets set if there's a break opportunity at the end of the textrun.
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// We normally don't use this break opportunity because the following text
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// will have a break opportunity at the start, but it's useful for line
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// layout to know about it in case the following content is not text
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TEXT_HAS_TRAILING_BREAK = 0x4000000,
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// This is set if the textrun was created for a textframe whose
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// NS_FRAME_IS_IN_SINGLE_CHAR_MI flag is set. This occurs if the textframe
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// belongs to a MathML <mi> element whose embedded text consists of a
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// single character.
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TEXT_IS_SINGLE_CHAR_MI = 0x8000000
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// The following are defined by gfxTextRunWordCache rather than here,
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// so that it also has access to the _INCOMING flag
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// TEXT_TRAILING_ARABICCHAR
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// TEXT_INCOMING_ARABICCHAR
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// This is defined in gfxTextRunFactory to allow access in gfxFont.
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// TEXT_USE_MATH_SCRIPT
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};
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// These constants are used in TransformText to represent context information
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// from previous textruns.
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enum {
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INCOMING_NONE = 0,
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INCOMING_WHITESPACE = 1,
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INCOMING_ARABICCHAR = 2
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};
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/**
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* Returns true if aChars/aLength are something that make a space
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* character not be whitespace when they follow the space character
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* (combining mark or join control, ignoring intervening direction
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* controls).
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*/
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static bool
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IsSpaceCombiningSequenceTail(const char16_t* aChars, int32_t aLength) {
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return aLength > 0 &&
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(mozilla::unicode::IsClusterExtender(aChars[0]) ||
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(IsBidiControl(aChars[0]) &&
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IsSpaceCombiningSequenceTail(aChars + 1, aLength - 1)
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)
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);
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}
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enum CompressionMode {
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COMPRESS_NONE,
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COMPRESS_WHITESPACE,
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COMPRESS_WHITESPACE_NEWLINE,
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COMPRESS_NONE_TRANSFORM_TO_SPACE
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};
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/**
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* Create a text run from a run of Unicode text. The text may have whitespace
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* compressed. A preformatted tab is sent to the text run as a single space.
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* (Tab spacing must be performed by textframe later.) Certain other
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* characters are discarded.
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*
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* @param aCompressWhitespace control what is compressed to a
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* single space character: no compression, compress spaces (not followed
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* by combining mark) and tabs, compress those plus newlines, or
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* no compression except newlines are discarded.
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* @param aIncomingFlags a flag indicating whether there was whitespace
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* or an Arabic character preceding this text. We set it to indicate if
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* there's an Arabic character or whitespace preceding the end of this text.
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*/
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static char16_t* TransformText(const char16_t* aText, uint32_t aLength,
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char16_t* aOutput,
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CompressionMode aCompression,
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uint8_t * aIncomingFlags,
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gfxSkipChars* aSkipChars,
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uint32_t* aAnalysisFlags);
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static uint8_t* TransformText(const uint8_t* aText, uint32_t aLength,
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uint8_t* aOutput,
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CompressionMode aCompression,
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uint8_t * aIncomingFlags,
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gfxSkipChars* aSkipChars,
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uint32_t* aAnalysisFlags);
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static void
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AppendLineBreakOffset(nsTArray<uint32_t>* aArray, uint32_t aOffset)
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{
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if (aArray->Length() > 0 && (*aArray)[aArray->Length() - 1] == aOffset)
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return;
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aArray->AppendElement(aOffset);
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}
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static uint32_t
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ComputeApproximateLengthWithWhitespaceCompression(nsIContent *aContent,
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const nsStyleText
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*aStyleText);
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};
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class nsSkipCharsRunIterator {
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public:
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enum LengthMode {
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LENGTH_UNSKIPPED_ONLY = false,
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LENGTH_INCLUDES_SKIPPED = true
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};
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nsSkipCharsRunIterator(const gfxSkipCharsIterator& aStart,
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LengthMode aLengthIncludesSkipped, uint32_t aLength)
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: mIterator(aStart), mRemainingLength(aLength), mRunLength(0),
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mVisitSkipped(false),
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mLengthIncludesSkipped(aLengthIncludesSkipped) {
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}
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void SetVisitSkipped() { mVisitSkipped = true; }
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void SetOriginalOffset(int32_t aOffset) {
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mIterator.SetOriginalOffset(aOffset);
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}
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void SetSkippedOffset(uint32_t aOffset) {
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mIterator.SetSkippedOffset(aOffset);
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}
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// guaranteed to return only positive-length runs
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bool NextRun();
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bool IsSkipped() const { return mSkipped; }
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// Always returns something > 0
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int32_t GetRunLength() const { return mRunLength; }
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const gfxSkipCharsIterator& GetPos() const { return mIterator; }
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int32_t GetOriginalOffset() const { return mIterator.GetOriginalOffset(); }
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uint32_t GetSkippedOffset() const { return mIterator.GetSkippedOffset(); }
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private:
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gfxSkipCharsIterator mIterator;
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int32_t mRemainingLength;
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int32_t mRunLength;
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bool mSkipped;
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bool mVisitSkipped;
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bool mLengthIncludesSkipped;
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};
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#endif /*NSTEXTFRAMEUTILS_H_*/
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