vcl/source/glyphs/graphite_textsrc.hxx

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  30
  31 #ifndef _SV_GRAPHITETEXTSRC_HXX
  32 #define _SV_GRAPHITETEXTSRC_HXX
  33 // Description: Implements the Graphite interfaces IGrTextSource and
  34 //              IGrGraphics which provide Graphite with access to the
  35 //              app's text storage system and the platform's font and
  36 //              graphics systems.
  37
  38 // We need this to enable namespace support in libgrengine headers.
  39 #define GR_NAMESPACE
  40
  41 // Standard Library
  42 #include <stdexcept>
  43 // Platform
  44
  45 #ifndef _SVWIN_H
  46 #include <tools/svwin.h>
  47 #endif
  48
  49 #ifndef _SV_SVSYS_HXX
  50 #include <svsys.h>
  51 #endif
  52
  53 #ifndef _SV_SALGDI_HXX
  54 #include <vcl/salgdi.hxx>
  55 #endif
  56
  57 #ifndef _SV_SALLAYOUT_HXX
  58 #include <vcl/sallayout.hxx>
  59 #endif
  60
  61 // Module
  62 #include "vcl/dllapi.h"
  63
  64 // Libraries
  65 #include <graphite/GrClient.h>
  66 #include <graphite/Font.h>
  67 #include <graphite/ITextSource.h>
  68
  69 // Module type definitions and forward declarations.
  70 //
  71 namespace grutils
  72 {
  73     class GrFeatureParser;
  74 }
  75 // Implements the Adaptor pattern to adapt the LayoutArgs and the ServerFont interfaces to the
  76 // gr::IGrTextSource interface.
  77 // @author tse
  78 //
  79 class TextSourceAdaptor : public gr::ITextSource
  80 {
  81 public:
  82         TextSourceAdaptor(ImplLayoutArgs &layout_args, const int nContextLen) throw();
  83         ~TextSourceAdaptor();
  84         virtual gr::UtfType     utfEncodingForm();
  85         virtual size_t          getLength();
  86         virtual size_t          fetch(gr::toffset ichMin, size_t cch, gr::utf32 * prgchBuffer);
  87         virtual size_t          fetch(gr::toffset ichMin, size_t cch, gr::utf16 * prgchwBuffer);
  88         virtual size_t          fetch(gr::toffset ichMin, size_t cch, gr::utf8  * prgchsBuffer);
  89         virtual bool            getRightToLeft(gr::toffset ich);
  90         virtual unsigned int    getDirectionDepth(gr::toffset ich);
  91         virtual float           getVerticalOffset(gr::toffset ich);
  92         virtual gr::isocode     getLanguage(gr::toffset ich);
  93
  94         virtual std::pair<gr::toffset, gr::toffset> propertyRange(gr::toffset ich);
  95         virtual size_t  getFontFeatures(gr::toffset ich, gr::FeatureSetting * prgfset);
  96         virtual bool    sameSegment(gr::toffset ich1, gr::toffset ich2);
  97
  98         operator ImplLayoutArgs & () throw();
  99         void setFeatures(const grutils::GrFeatureParser * pFeatures);
 100         const ImplLayoutArgs & getLayoutArgs() const { return maLayoutArgs; }
 101         size_t          getContextLength() const { return mnEnd; };
 102         inline void switchLayoutArgs(ImplLayoutArgs & newArgs);
 103 private:
 104         // Prevent the generation of a default assignment operator.
 105         TextSourceAdaptor & operator=(const TextSourceAdaptor &);
 106
 107         void getCharProperties(const int, int &, int &, size_t &);
 108
 109         ImplLayoutArgs  maLayoutArgs;
 110         size_t    mnEnd;
 111         const grutils::GrFeatureParser * mpFeatures;
 112 };
 113
 114 inline TextSourceAdaptor::TextSourceAdaptor(ImplLayoutArgs &la, const int nContextLen) throw()
 115   : maLayoutArgs(la),
 116     mnEnd(std::min(la.mnLength, nContextLen)),
 117     mpFeatures(NULL)
 118 {
 119 }
 120
 121 inline  TextSourceAdaptor::operator ImplLayoutArgs & () throw() {
 122         return maLayoutArgs;
 123 }
 124
 125 inline void TextSourceAdaptor::switchLayoutArgs(ImplLayoutArgs & aNewArgs)
 126 {
 127     mnEnd += aNewArgs.mnMinCharPos - maLayoutArgs.mnMinCharPos;
 128     maLayoutArgs = aNewArgs;
 129 }
 130
 131 #endif