qrasterdefs_p.h

奇趣公司比较新的qt/emd版本

  /*    move_to  :: The `move to' emitter.                                 */
  /*                                                                       */
  /*    line_to  :: The segment emitter.                                   */
  /*                                                                       */
  /*    conic_to :: The second-order Bezier arc emitter.                   */
  /*                                                                       */
  /*    cubic_to :: The third-order Bezier arc emitter.                    */
  /*                                                                       */
  /*    shift    :: The shift that is applied to coordinates before they   */
  /*                are sent to the emitter.                               */
  /*                                                                       */
  /*    delta    :: The delta that is applied to coordinates before they   */
  /*                are sent to the emitter, but after the shift.          */
  /*                                                                       */
  /* <Note>                                                                */
  /*    The point coordinates sent to the emitters are the transformed     */
  /*    version of the original coordinates (this is important for high    */
  /*    accuracy during scan-conversion).  The transformation is simple:   */
  /*                                                                       */
  /*      x' = (x << shift) - delta                                        */
  /*      y' = (x << shift) - delta                                        */
  /*                                                                       */
  /*    Set the value of `shift' and `delta' to 0 to get the original      */
  /*    point coordinates.                                                 */
  /*                                                                       */
  typedef struct  QT_FT_Outline_Funcs_
  {
    QT_FT_Outline_MoveToFunc   move_to;
    QT_FT_Outline_LineToFunc   line_to;
    QT_FT_Outline_ConicToFunc  conic_to;
    QT_FT_Outline_CubicToFunc  cubic_to;

    int                     shift;
    QT_FT_Pos                  delta;

  } QT_FT_Outline_Funcs;


  /*************************************************************************/
  /*                                                                       */
  /* <Section>                                                             */
  /*    basic_types                                                        */
  /*                                                                       */
  /*************************************************************************/


  /*************************************************************************/
  /*                                                                       */
  /* <Macro>                                                               */
  /*    QT_FT_IMAGE_TAG                                                       */
  /*                                                                       */
  /* <Description>                                                         */
  /*    This macro converts four letter tags into an unsigned long.        */
  /*                                                                       */
  /* <Note>                                                                */
  /*    Since many 16bit compilers don't like 32bit enumerations, you      */
  /*    should redefine this macro in case of problems to something like   */
  /*    this:                                                              */
  /*                                                                       */
  /*      #define QT_FT_IMAGE_TAG( value, _x1, _x2, _x3, _x4 )  value         */
  /*                                                                       */
  /*    to get a simple enumeration without assigning special numbers.     */
  /*                                                                       */
#ifndef QT_FT_IMAGE_TAG
#define QT_FT_IMAGE_TAG( value, _x1, _x2, _x3, _x4 )  \
          value = ( ( (unsigned long)_x1 << 24 ) | \
                    ( (unsigned long)_x2 << 16 ) | \
                    ( (unsigned long)_x3 << 8  ) | \
                      (unsigned long)_x4         )
#endif /* QT_FT_IMAGE_TAG */


  /*************************************************************************/
  /*                                                                       */
  /* <Enum>                                                                */
  /*    QT_FT_Glyph_Format                                                    */
  /*                                                                       */
  /* <Description>                                                         */
  /*    An enumeration type used to describe the format of a given glyph   */
  /*    image.  Note that this version of FreeType only supports two image */
  /*    formats, even though future font drivers will be able to register  */
  /*    their own format.                                                  */
  /*                                                                       */
  /* <Values>                                                              */
  /*    QT_FT_GLYPH_FORMAT_NONE ::                                            */
  /*      The value 0 is reserved and does describe a glyph format.        */
  /*                                                                       */
  /*    QT_FT_GLYPH_FORMAT_COMPOSITE ::                                       */
  /*      The glyph image is a composite of several other images.  This    */
  /*      format is _only_ used with @QT_FT_LOAD_NO_RECURSE, and is used to   */
  /*      report compound glyphs (like accented characters).               */
  /*                                                                       */
  /*    QT_FT_GLYPH_FORMAT_BITMAP ::                                          */
  /*      The glyph image is a bitmap, and can be described as an          */
  /*      @QT_FT_Bitmap.  You generally need to access the `bitmap' field of  */
  /*      the @QT_FT_GlyphSlotRec structure to read it.                       */
  /*                                                                       */
  /*    QT_FT_GLYPH_FORMAT_OUTLINE ::                                         */
  /*      The glyph image is a vertorial outline made of line segments     */
  /*      and Bezier arcs; it can be described as an @QT_FT_Outline; you      */
  /*      generally want to access the `outline' field of the              */
  /*      @QT_FT_GlyphSlotRec structure to read it.                           */
  /*                                                                       */
  /*    QT_FT_GLYPH_FORMAT_PLOTTER ::                                         */
  /*      The glyph image is a vectorial path with no inside/outside       */
  /*      contours.  Some Type 1 fonts, like those in the Hershey family,  */
  /*      contain glyphs in this format.  These are described as           */
  /*      @QT_FT_Outline, but FreeType isn't currently capable of rendering   */
  /*      them correctly.                                                  */
  /*                                                                       */
  typedef enum  QT_FT_Glyph_Format_
  {
    QT_FT_IMAGE_TAG( QT_FT_GLYPH_FORMAT_NONE, 0, 0, 0, 0 ),

    QT_FT_IMAGE_TAG( QT_FT_GLYPH_FORMAT_COMPOSITE, 'c', 'o', 'm', 'p' ),
    QT_FT_IMAGE_TAG( QT_FT_GLYPH_FORMAT_BITMAP,    'b', 'i', 't', 's' ),
    QT_FT_IMAGE_TAG( QT_FT_GLYPH_FORMAT_OUTLINE,   'o', 'u', 't', 'l' ),
    QT_FT_IMAGE_TAG( QT_FT_GLYPH_FORMAT_PLOTTER,   'p', 'l', 'o', 't' )

  } QT_FT_Glyph_Format;


  /*************************************************************************/
  /*                                                                       */
  /* <Enum>                                                                */
  /*    qt_ft_glyph_format_xxx                                                */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A list of decprecated constants.  Use the corresponding            */
  /*    @QT_FT_Glyph_Format values instead.                                   */
  /*                                                                       */
  /* <Values>                                                              */
  /*    qt_ft_glyph_format_none      :: see @QT_FT_GLYPH_FORMAT_NONE             */
  /*    qt_ft_glyph_format_composite :: see @QT_FT_GLYPH_FORMAT_COMPOSITE        */
  /*    qt_ft_glyph_format_bitmap    :: see @QT_FT_GLYPH_FORMAT_BITMAP           */
  /*    qt_ft_glyph_format_outline   :: see @QT_FT_GLYPH_FORMAT_OUTLINE          */
  /*    qt_ft_glyph_format_plotter   :: see @QT_FT_GLYPH_FORMAT_PLOTTER          */
  /*                                                                       */
#define qt_ft_glyph_format_none       QT_FT_GLYPH_FORMAT_NONE
#define qt_ft_glyph_format_composite  QT_FT_GLYPH_FORMAT_COMPOSITE
#define qt_ft_glyph_format_bitmap     QT_FT_GLYPH_FORMAT_BITMAP
#define qt_ft_glyph_format_outline    QT_FT_GLYPH_FORMAT_OUTLINE
#define qt_ft_glyph_format_plotter    QT_FT_GLYPH_FORMAT_PLOTTER


  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****            R A S T E R   D E F I N I T I O N S                *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/


  /*************************************************************************/
  /*                                                                       */
  /* A raster is a scan converter, in charge of rendering an outline into  */
  /* a a bitmap.  This section contains the public API for rasters.        */
  /*                                                                       */
  /* Note that in FreeType 2, all rasters are now encapsulated within      */
  /* specific modules called `renderers'.  See `freetype/ftrender.h' for   */
  /* more details on renderers.                                            */
  /*                                                                       */
  /*************************************************************************/


  /*************************************************************************/
  /*                                                                       */
  /* <Section>                                                             */
  /*    raster                                                             */
  /*                                                                       */
  /* <Title>                                                               */
  /*    Scanline converter                                                 */
  /*                                                                       */
  /* <Abstract>                                                            */
  /*    How vectorial outlines are converted into bitmaps and pixmaps.     */
  /*                                                                       */
  /* <Description>                                                         */
  /*    This section contains technical definitions.                       */
  /*                                                                       */
  /*************************************************************************/


  /*************************************************************************/
  /*                                                                       */
  /* <Type>                                                                */
  /*    QT_FT_Raster                                                          */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A handle (pointer) to a raster object.  Each object can be used    */
  /*    independently to convert an outline into a bitmap or pixmap.       */
  /*                                                                       */
  typedef struct QT_FT_RasterRec_*  QT_FT_Raster;


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    QT_FT_Span                                                            */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A structure used to model a single span of gray (or black) pixels  */
  /*    when rendering a monochrome or anti-aliased bitmap.                */
  /*                                                                       */
  /* <Fields>                                                              */