--- /dev/null
+/***************************************************************************/
+/* */
+/* ftglyph.h */
+/* */
+/* FreeType convenience functions to handle glyphs (specification). */
+/* */
+/* Copyright 1996-2001 by */
+/* David Turner, Robert Wilhelm, and Werner Lemberg. */
+/* */
+/* This file is part of the FreeType project, and may only be used, */
+/* modified, and distributed under the terms of the FreeType project */
+/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
+/* this file you indicate that you have read the license and */
+/* understand and accept it fully. */
+/* */
+/***************************************************************************/
+
+
+ /*************************************************************************/
+ /* */
+ /* This file contains the definition of several convenience functions */
+ /* that can be used by client applications to easily retrieve glyph */
+ /* bitmaps and outlines from a given face. */
+ /* */
+ /* These functions should be optional if you are writing a font server */
+ /* or text layout engine on top of FreeType. However, they are pretty */
+ /* handy for many other simple uses of the library. */
+ /* */
+ /*************************************************************************/
+
+
+#ifndef __FTGLYPH_H__
+#define __FTGLYPH_H__
+
+
+#include <ft2build.h>
+#include FT_FREETYPE_H
+
+
+FT_BEGIN_HEADER
+
+
+ /*************************************************************************/
+ /* */
+ /* <Section> */
+ /* glyph_management */
+ /* */
+ /* <Title> */
+ /* Glyph Management */
+ /* */
+ /* <Abstract> */
+ /* Generic interface to manage individual glyph data. */
+ /* */
+ /* <Description> */
+ /* This section contains definitions used to manage glyph data */
+ /* through generic FT_Glyph objects. Each of them can contain a */
+ /* bitmap, a vector outline, or even images in other formats. */
+ /* */
+ /*************************************************************************/
+
+
+ /* forward declaration to a private type */
+ typedef struct FT_Glyph_Class_ FT_Glyph_Class;
+
+
+ /*************************************************************************/
+ /* */
+ /* <Type> */
+ /* FT_Glyph */
+ /* */
+ /* <Description> */
+ /* Handle to an object used to model generic glyph images. It is a */
+ /* pointer to the @FT_GlyphRec structure and can contain a glyph */
+ /* bitmap or pointer. */
+ /* */
+ /* <Note> */
+ /* Glyph objects are not owned by the library. You must thus release */
+ /* them manually (through @FT_Done_Glyph) _before_ calling */
+ /* @FT_Done_FreeType. */
+ /* */
+ typedef struct FT_GlyphRec_* FT_Glyph;
+
+
+ /*************************************************************************/
+ /* */
+ /* <Struct> */
+ /* FT_GlyphRec */
+ /* */
+ /* <Description> */
+ /* The root glyph structure contains a given glyph image plus its */
+ /* advance width in 16.16 fixed float format. */
+ /* */
+ /* <Fields> */
+ /* library :: A handle to the FreeType library object. */
+ /* */
+ /* clazz :: A pointer to the glyph's class. Private. */
+ /* */
+ /* format :: The format of the glyph's image. */
+ /* */
+ /* advance :: A 16.16 vector that gives the glyph's advance width. */
+ /* */
+ typedef struct FT_GlyphRec_
+ {
+ FT_Library library;
+ const FT_Glyph_Class* clazz;
+ FT_Glyph_Format format;
+ FT_Vector advance;
+
+ } FT_GlyphRec;
+
+
+ /*************************************************************************/
+ /* */
+ /* <Type> */
+ /* FT_BitmapGlyph */
+ /* */
+ /* <Description> */
+ /* A handle to an object used to model a bitmap glyph image. This is */
+ /* a sub-class of @FT_Glyph, and a pointer to @FT_BitmapGlyphRec. */
+ /* */
+ typedef struct FT_BitmapGlyphRec_* FT_BitmapGlyph;
+
+
+ /*************************************************************************/
+ /* */
+ /* <Struct> */
+ /* FT_BitmapGlyphRec */
+ /* */
+ /* <Description> */
+ /* A structure used for bitmap glyph images. This really is a */
+ /* `sub-class' of `FT_GlyphRec'. */
+ /* */
+ /* <Fields> */
+ /* root :: The root FT_Glyph fields. */
+ /* */
+ /* left :: The left-side bearing, i.e., the horizontal distance */
+ /* from the current pen position to the left border of the */
+ /* glyph bitmap. */
+ /* */
+ /* top :: The top-side bearing, i.e., the vertical distance from */
+ /* the current pen position to the top border of the glyph */
+ /* bitmap. This distance is positive for upwards-y! */
+ /* */
+ /* bitmap :: A descriptor for the bitmap. */
+ /* */
+ /* <Note> */
+ /* You can typecast FT_Glyph to FT_BitmapGlyph if you have */
+ /* glyph->format == FT_GLYPH_FORMAT_BITMAP. This lets you access */
+ /* the bitmap's contents easily. */
+ /* */
+ /* The corresponding pixel buffer is always owned by the BitmapGlyph */
+ /* and is thus created and destroyed with it. */
+ /* */
+ typedef struct FT_BitmapGlyphRec_
+ {
+ FT_GlyphRec root;
+ FT_Int left;
+ FT_Int top;
+ FT_Bitmap bitmap;
+
+ } FT_BitmapGlyphRec;
+
+
+ /*************************************************************************/
+ /* */
+ /* <Type> */
+ /* FT_OutlineGlyph */
+ /* */
+ /* <Description> */
+ /* A handle to an object used to model an outline glyph image. This */
+ /* is a sub-class of @FT_Glyph, and a pointer to @FT_OutlineGlyphRec. */
+ /* */
+ typedef struct FT_OutlineGlyphRec_* FT_OutlineGlyph;
+
+
+ /*************************************************************************/
+ /* */
+ /* <Struct> */
+ /* FT_OutlineGlyphRec */
+ /* */
+ /* <Description> */
+ /* A structure used for outline (vectorial) glyph images. This */
+ /* really is a `sub-class' of `FT_GlyphRec'. */
+ /* */
+ /* <Fields> */
+ /* root :: The root FT_Glyph fields. */
+ /* */
+ /* outline :: A descriptor for the outline. */
+ /* */
+ /* <Note> */
+ /* You can typecast FT_Glyph to FT_OutlineGlyph if you have */
+ /* glyph->format == FT_GLYPH_FORMAT_OUTLINE. This lets you access */
+ /* the outline's content easily. */
+ /* */
+ /* As the outline is extracted from a glyph slot, its coordinates are */
+ /* expressed normally in 26.6 pixels, unless the flag */
+ /* FT_LOAD_NO_SCALE was used in FT_Load_Glyph() or FT_Load_Char(). */
+ /* */
+ /* The outline's tables are always owned by the object and are */
+ /* destroyed with it. */
+ /* */
+ typedef struct FT_OutlineGlyphRec_
+ {
+ FT_GlyphRec root;
+ FT_Outline outline;
+
+ } FT_OutlineGlyphRec;
+
+
+ /*************************************************************************/
+ /* */
+ /* <Function> */
+ /* FT_Get_Glyph */
+ /* */
+ /* <Description> */
+ /* A function used to extract a glyph image from a slot. */
+ /* */
+ /* <Input> */
+ /* slot :: A handle to the source glyph slot. */
+ /* */
+ /* <Output> */
+ /* aglyph :: A handle to the glyph object. */
+ /* */
+ /* <Return> */
+ /* FreeType error code. 0 means success. */
+ /* */
+ FT_EXPORT( FT_Error )
+ FT_Get_Glyph( FT_GlyphSlot slot,
+ FT_Glyph *aglyph );
+
+
+ /*************************************************************************/
+ /* */
+ /* <Function> */
+ /* FT_Glyph_Copy */
+ /* */
+ /* <Description> */
+ /* A function used to copy a glyph image. */
+ /* */
+ /* <Input> */
+ /* source :: A handle to the source glyph object. */
+ /* */
+ /* <Output> */
+ /* target :: A handle to the target glyph object. 0 in case of */
+ /* error. */
+ /* */
+ /* <Return> */
+ /* FreeType error code. 0 means success. */
+ /* */
+ FT_EXPORT( FT_Error )
+ FT_Glyph_Copy( FT_Glyph source,
+ FT_Glyph *target );
+
+
+ /*************************************************************************/
+ /* */
+ /* <Function> */
+ /* FT_Glyph_Transform */
+ /* */
+ /* <Description> */
+ /* Transforms a glyph image if its format is scalable. */
+ /* */
+ /* <InOut> */
+ /* glyph :: A handle to the target glyph object. */
+ /* */
+ /* <Input> */
+ /* matrix :: A pointer to a 2x2 matrix to apply. */
+ /* */
+ /* delta :: A pointer to a 2d vector to apply. Coordinates are */
+ /* expressed in 1/64th of a pixel. */
+ /* */
+ /* <Return> */
+ /* FreeType error code (the glyph format is not scalable if it is */
+ /* not zero). */
+ /* */
+ /* <Note> */
+ /* The 2x2 transformation matrix is also applied to the glyph's */
+ /* advance vector. */
+ /* */
+ FT_EXPORT( FT_Error )
+ FT_Glyph_Transform( FT_Glyph glyph,
+ FT_Matrix* matrix,
+ FT_Vector* delta );
+
+ /* */
+
+ /*************************************************************************/
+ /* */
+ /* <Function> */
+ /* FT_Glyph_Get_CBox */
+ /* */
+ /* <Description> */
+ /* Returns a glyph's `control box'. The control box encloses all the */
+ /* outline's points, including Bezier control points. Though it */
+ /* coincides with the exact bounding box for most glyphs, it can be */
+ /* slightly larger in some situations (like when rotating an outline */
+ /* which contains Bezier outside arcs). */
+ /* */
+ /* Computing the control box is very fast, while getting the bounding */
+ /* box can take much more time as it needs to walk over all segments */
+ /* and arcs in the outline. To get the latter, you can use the */
+ /* `ftbbox' component which is dedicated to this single task. */
+ /* */
+ /* <Input> */
+ /* glyph :: A handle to the source glyph object. */
+ /* */
+ /* mode :: The mode which indicates how to interpret the returned */
+ /* bounding box values. */
+ /* */
+ /* <Output> */
+ /* acbox :: The glyph coordinate bounding box. Coordinates are */
+ /* expressed in 1/64th of pixels if it is grid-fitted. */
+ /* */
+ /* <Note> */
+ /* Coordinates are relative to the glyph origin, using the Y-upwards */
+ /* convention. */
+ /* */
+ /* If the glyph has been loaded with FT_LOAD_NO_SCALE, `bbox_mode' */
+ /* must be set to `ft_glyph_bbox_unscaled' to get unscaled font */
+ /* units. */
+ /* */
+ /* If `bbox_mode' is set to `ft_glyph_bbox_subpixels' the bbox */
+ /* coordinates are returned in 26.6 pixels (i.e. 1/64th of pixels). */
+ /* */
+ /* Note that the maximum coordinates are exclusive, which means that */
+ /* one can compute the width and height of the glyph image (be it in */
+ /* integer or 26.6 pixels) as: */
+ /* */
+ /* width = bbox.xMax - bbox.xMin; */
+ /* height = bbox.yMax - bbox.yMin; */
+ /* */
+ /* Note also that for 26.6 coordinates, if `bbox_mode' is set to */
+ /* `ft_glyph_bbox_gridfit', the coordinates will also be grid-fitted, */
+ /* which corresponds to: */
+ /* */
+ /* bbox.xMin = FLOOR(bbox.xMin); */
+ /* bbox.yMin = FLOOR(bbox.yMin); */
+ /* bbox.xMax = CEILING(bbox.xMax); */
+ /* bbox.yMax = CEILING(bbox.yMax); */
+ /* */
+ /* To get the bbox in pixel coordinates, set `bbox_mode' to */
+ /* `ft_glyph_bbox_truncate'. */
+ /* */
+ /* To get the bbox in grid-fitted pixel coordinates, set `bbox_mode' */
+ /* to `ft_glyph_bbox_pixels'. */
+ /* */
+ /* The default value for `bbox_mode' is `ft_glyph_bbox_pixels'. */
+ /* */
+ enum
+ {
+ ft_glyph_bbox_unscaled = 0, /* return unscaled font units */
+ ft_glyph_bbox_subpixels = 0, /* return unfitted 26.6 coordinates */
+ ft_glyph_bbox_gridfit = 1, /* return grid-fitted 26.6 coordinates */
+ ft_glyph_bbox_truncate = 2, /* return coordinates in integer pixels */
+ ft_glyph_bbox_pixels = 3 /* return grid-fitted pixel coordinates */
+ };
+
+
+ FT_EXPORT( void )
+ FT_Glyph_Get_CBox( FT_Glyph glyph,
+ FT_UInt bbox_mode,
+ FT_BBox *acbox );
+
+
+ /*************************************************************************/
+ /* */
+ /* <Function> */
+ /* FT_Glyph_To_Bitmap */
+ /* */
+ /* <Description> */
+ /* Converts a given glyph object to a bitmap glyph object. */
+ /* */
+ /* <InOut> */
+ /* the_glyph :: A pointer to a handle to the target glyph. */
+ /* */
+ /* <Input> */
+ /* render_mode :: An enumeration that describe how the data is */
+ /* rendered. */
+ /* */
+ /* origin :: A pointer to a vector used to translate the glyph */
+ /* image before rendering. Can be 0 (if no */
+ /* translation). The origin is expressed in */
+ /* 26.6 pixels. */
+ /* */
+ /* destroy :: A boolean that indicates that the original glyph */
+ /* image should be destroyed by this function. It is */
+ /* never destroyed in case of error. */
+ /* */
+ /* <Return> */
+ /* FreeType error code. 0 means success. */
+ /* */
+ /* <Note> */
+ /* The glyph image is translated with the `origin' vector before */
+ /* rendering. In case of error, it it translated back to its */
+ /* original position and the glyph is left untouched. */
+ /* */
+ /* The first parameter is a pointer to a FT_Glyph handle, that will */
+ /* be replaced by this function. Typically, you would use (omitting */
+ /* error handling): */
+ /* */
+ /* */
+ /* { */
+ /* FT_Glyph glyph; */
+ /* FT_BitmapGlyph glyph_bitmap; */
+ /* */
+ /* */
+ /* // load glyph */
+ /* error = FT_Load_Char( face, glyph_index, FT_LOAD_DEFAUT ); */
+ /* */
+ /* // extract glyph image */
+ /* error = FT_Get_Glyph( face->glyph, &glyph ); */
+ /* */
+ /* // convert to a bitmap (default render mode + destroy old) */
+ /* if ( glyph->format != FT_GLYPH_FORMAT_BITMAP ) */
+ /* { */
+ /* error = FT_Glyph_To_Bitmap( &glyph, ft_render_mode_default, */
+ /* 0, 1 ); */
+ /* if ( error ) // glyph unchanged */
+ /* ... */
+ /* } */
+ /* */
+ /* // access bitmap content by typecasting */
+ /* glyph_bitmap = (FT_BitmapGlyph)glyph; */
+ /* */
+ /* // do funny stuff with it, like blitting/drawing */
+ /* ... */
+ /* */
+ /* // discard glyph image (bitmap or not) */
+ /* FT_Done_Glyph( glyph ); */
+ /* } */
+ /* */
+ /* */
+ /* This function will always fail if the glyph's format isn't */
+ /* scalable. */
+ /* */
+ FT_EXPORT( FT_Error )
+ FT_Glyph_To_Bitmap( FT_Glyph* the_glyph,
+ FT_Render_Mode render_mode,
+ FT_Vector* origin,
+ FT_Bool destroy );
+
+
+ /*************************************************************************/
+ /* */
+ /* <Function> */
+ /* FT_Done_Glyph */
+ /* */
+ /* <Description> */
+ /* Destroys a given glyph. */
+ /* */
+ /* <Input> */
+ /* glyph :: A handle to the target glyph object. */
+ /* */
+ FT_EXPORT( void )
+ FT_Done_Glyph( FT_Glyph glyph );
+
+
+ /* other helpful functions */
+
+ /*************************************************************************/
+ /* */
+ /* <Section> */
+ /* computations */
+ /* */
+ /*************************************************************************/
+
+
+ /*************************************************************************/
+ /* */
+ /* <Function> */
+ /* FT_Matrix_Multiply */
+ /* */
+ /* <Description> */
+ /* Performs the matrix operation `b = a*b'. */
+ /* */
+ /* <Input> */
+ /* a :: A pointer to matrix `a'. */
+ /* */
+ /* <InOut> */
+ /* b :: A pointer to matrix `b'. */
+ /* */
+ /* <Note> */
+ /* The result is undefined if either `a' or `b' is zero. */
+ /* */
+ FT_EXPORT( void )
+ FT_Matrix_Multiply( const FT_Matrix* a,
+ FT_Matrix* b );
+
+
+ /*************************************************************************/
+ /* */
+ /* <Function> */
+ /* FT_Matrix_Invert */
+ /* */
+ /* <Description> */
+ /* Inverts a 2x2 matrix. Returns an error if it can't be inverted. */
+ /* */
+ /* <InOut> */
+ /* matrix :: A pointer to the target matrix. Remains untouched in */
+ /* case of error. */
+ /* */
+ /* <Return> */
+ /* FreeType error code. 0 means success. */
+ /* */
+ FT_EXPORT( FT_Error )
+ FT_Matrix_Invert( FT_Matrix* matrix );
+
+
+ /* */
+
+
+FT_END_HEADER
+
+#endif /* __FTGLYPH_H__ */
+
+
+/* END */
git://git.jankratochvil.net / reactos.git / blobdiff