gecko/layout/generic/nsTextRunTransformations.h
2011-10-17 10:59:28 -04:00

163 lines
6.6 KiB
C++

/* -*- 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 Novell code.
*
* The Initial Developer of the Original Code is Novell Corporation.
* Portions created by the Initial Developer are Copyright (C) 2006
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* robert@ocallahan.org
*
* Alternatively, the contents of this file may be used under the terms of
* either 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 ***** */
#ifndef NSTEXTRUNTRANSFORMATIONS_H_
#define NSTEXTRUNTRANSFORMATIONS_H_
#include "gfxFont.h"
class nsTransformedTextRun;
class nsStyleContext;
class nsTransformingTextRunFactory {
public:
virtual ~nsTransformingTextRunFactory() {}
// Default 8-bit path just transforms to Unicode and takes that path
nsTransformedTextRun* MakeTextRun(const PRUint8* aString, PRUint32 aLength,
const gfxFontGroup::Parameters* aParams,
gfxFontGroup* aFontGroup, PRUint32 aFlags,
nsStyleContext** aStyles, bool aOwnsFactory = true);
nsTransformedTextRun* MakeTextRun(const PRUnichar* aString, PRUint32 aLength,
const gfxFontGroup::Parameters* aParams,
gfxFontGroup* aFontGroup, PRUint32 aFlags,
nsStyleContext** aStyles, bool aOwnsFactory = true);
virtual void RebuildTextRun(nsTransformedTextRun* aTextRun, gfxContext* aRefContext) = 0;
};
/**
* Builds textruns that render their text using a font-variant (i.e.,
* smallcaps).
*/
class nsFontVariantTextRunFactory : public nsTransformingTextRunFactory {
public:
virtual void RebuildTextRun(nsTransformedTextRun* aTextRun, gfxContext* aRefContext);
};
/**
* Builds textruns that transform the text in some way (e.g., capitalize)
* and then render the text using some other textrun implementation.
*/
class nsCaseTransformTextRunFactory : public nsTransformingTextRunFactory {
public:
// We could add an optimization here so that when there is no inner
// factory, no title-case conversion, and no upper-casing of SZLIG, we override
// MakeTextRun (after making it virtual in the superclass) and have it
// just convert the string to uppercase or lowercase and create the textrun
// via the fontgroup.
// Takes ownership of aInnerTransformTextRunFactory
nsCaseTransformTextRunFactory(nsTransformingTextRunFactory* aInnerTransformingTextRunFactory,
bool aAllUppercase = false)
: mInnerTransformingTextRunFactory(aInnerTransformingTextRunFactory),
mAllUppercase(aAllUppercase) {}
virtual void RebuildTextRun(nsTransformedTextRun* aTextRun, gfxContext* aRefContext);
protected:
nsAutoPtr<nsTransformingTextRunFactory> mInnerTransformingTextRunFactory;
bool mAllUppercase;
};
/**
* So that we can reshape as necessary, we store enough information
* to fully rebuild the textrun contents.
*/
class nsTransformedTextRun : public gfxTextRun {
public:
static nsTransformedTextRun *Create(const gfxTextRunFactory::Parameters* aParams,
nsTransformingTextRunFactory* aFactory,
gfxFontGroup* aFontGroup,
const PRUnichar* aString, PRUint32 aLength,
const PRUint32 aFlags, nsStyleContext** aStyles,
bool aOwnsFactory);
~nsTransformedTextRun() {
if (mOwnsFactory) {
delete mFactory;
}
}
void SetCapitalization(PRUint32 aStart, PRUint32 aLength,
bool* aCapitalization,
gfxContext* aRefContext);
virtual bool SetPotentialLineBreaks(PRUint32 aStart, PRUint32 aLength,
PRUint8* aBreakBefore,
gfxContext* aRefContext);
/**
* Called after SetCapitalization and SetPotentialLineBreaks
* are done and before we request any data from the textrun. Also always
* called after a Create.
*/
void FinishSettingProperties(gfxContext* aRefContext)
{
if (mNeedsRebuild) {
mNeedsRebuild = false;
mFactory->RebuildTextRun(this, aRefContext);
}
}
// override the gfxTextRun impl to account for additional members here
virtual PRUint64 ComputeSize();
nsTransformingTextRunFactory *mFactory;
nsTArray<nsRefPtr<nsStyleContext> > mStyles;
nsTArray<bool> mCapitalize;
bool mOwnsFactory;
bool mNeedsRebuild;
private:
nsTransformedTextRun(const gfxTextRunFactory::Parameters* aParams,
nsTransformingTextRunFactory* aFactory,
gfxFontGroup* aFontGroup,
const PRUnichar* aString, PRUint32 aLength,
const PRUint32 aFlags, nsStyleContext** aStyles,
bool aOwnsFactory,
CompressedGlyph *aGlyphStorage)
: gfxTextRun(aParams, aString, aLength, aFontGroup, aFlags, aGlyphStorage),
mFactory(aFactory), mOwnsFactory(aOwnsFactory), mNeedsRebuild(true)
{
PRUint32 i;
for (i = 0; i < aLength; ++i) {
mStyles.AppendElement(aStyles[i]);
}
}
};
#endif /*NSTEXTRUNTRANSFORMATIONS_H_*/