gecko-dev/layout/generic/nsTextRunTransformations.h

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#ifndef NSTEXTRUNTRANSFORMATIONS_H_
#define NSTEXTRUNTRANSFORMATIONS_H_

#include "gfxFont.h"

class nsCaseTransformingTextRun;
class nsStyleContext;

class nsTransformingTextRunFactory : public gfxTextRunFactory {
public:
  nsTransformingTextRunFactory(gfxTextRunFactory* aInnerTextRunFactory,
                               nsTransformingTextRunFactory* aInnerTransformingTextRunFactory)
    : mInnerTextRunFactory(aInnerTextRunFactory),
      mInnerTransformingTextRunFactory(aInnerTransformingTextRunFactory),
      mStyles(nsnull) {}

  // Assign style contexts to each character in the string. Call this before
  // calling MakeTextRun. The array needs to have a lifetime covering the
  // call to MakeTextRun.
  virtual void SetStyles(nsStyleContext** aStyles) { mStyles = aStyles; }
  // Default 8-bit path just transforms to Unicode and takes that path
  virtual gfxTextRun* MakeTextRun(const PRUint8* aString, PRUint32 aLength,
                                  Parameters* aParams);
  // Redeclare this to make C++ compiler shut up
  virtual gfxTextRun* MakeTextRun(const PRUnichar* aString, PRUint32 aLength,
                                  Parameters* aParams) = 0;

protected:
  nsRefPtr<gfxTextRunFactory>            mInnerTextRunFactory;
  nsRefPtr<nsTransformingTextRunFactory> mInnerTransformingTextRunFactory;
  nsStyleContext**                       mStyles;
};

/**
 * Builds textruns that render their text using a font-variant (i.e.,
 * smallcaps).
 */
class nsFontVariantTextRunFactory : public nsTransformingTextRunFactory {
public:
  nsFontVariantTextRunFactory(gfxFontGroup* aFontGroup)
    : nsTransformingTextRunFactory(aFontGroup, nsnull), mFontGroup(aFontGroup) {}
    
  // Redeclare this to make C++ compiler shut up
  virtual gfxTextRun* MakeTextRun(const PRUint8* aString, PRUint32 aLength,
                                  Parameters* aParams) {
    return nsTransformingTextRunFactory::MakeTextRun(aString, aLength, aParams);
  }
  virtual gfxTextRun* MakeTextRun(const PRUnichar* aString, PRUint32 aLength,
                                  Parameters* aParams);

private:
  nsRefPtr<gfxFontGroup> mFontGroup;
};

/**
 * 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:
  nsCaseTransformTextRunFactory(gfxTextRunFactory* aInnerTextRunFactory,
                                nsTransformingTextRunFactory* aInnerTransformingTextRunFactory,
                                PRBool aAllUppercase = PR_FALSE)
    : nsTransformingTextRunFactory(aInnerTextRunFactory, aInnerTransformingTextRunFactory),
      mAllUppercase(aAllUppercase) {}

  // Redeclare this to make C++ compiler shut up
  virtual gfxTextRun* MakeTextRun(const PRUint8* aString, PRUint32 aLength,
                                  Parameters* aParams) {
    return nsTransformingTextRunFactory::MakeTextRun(aString, aLength, aParams);
  }
  virtual gfxTextRun* MakeTextRun(const PRUnichar* aString, PRUint32 aLength,
                                  Parameters* aParams);

  // We need these for the implementation of case-transforming text runs
  gfxTextRunFactory* GetInnerTextRunFactory() { return mInnerTextRunFactory; }
  nsTransformingTextRunFactory* GetInnerTransformingTextRunFactory() {
    return mInnerTransformingTextRunFactory;
  }
  nsStyleContext** GetStyles() { return mStyles; }
  PRBool IsAllUppercase() { return mAllUppercase; }

private:
  PRPackedBool mAllUppercase;
};

#endif /*NSTEXTRUNTRANSFORMATIONS_H_*/