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/***************************************************************************/
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/* */
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/* ftoutln.h */
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/* */
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/* Support for the FT_Outline type used to store glyph shapes of */
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/* most scalable font formats (specification). */
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/* */
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/* Copyright 1996-2003, 2005-2011 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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#ifndef __FTOUTLN_H__
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#define __FTOUTLN_H__
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#ifdef FREETYPE_H
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#error "freetype.h of FreeType 1 has been loaded!"
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#error "Please fix the directory search order for header files"
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#error "so that freetype.h of FreeType 2 is found first."
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#endif
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FT_BEGIN_HEADER
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/*************************************************************************/
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/* */
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/* <Section> */
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/* outline_processing */
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/* */
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/* <Title> */
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/* Outline Processing */
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/* */
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/* <Abstract> */
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/* Functions to create, transform, and render vectorial glyph images. */
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/* */
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/* <Description> */
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/* This section contains routines used to create and destroy scalable */
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/* glyph images known as `outlines'. These can also be measured, */
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/* transformed, and converted into bitmaps and pixmaps. */
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/* */
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/* <Order> */
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/* FT_Outline */
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/* FT_OUTLINE_FLAGS */
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/* FT_Outline_New */
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/* FT_Outline_Done */
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/* FT_Outline_Copy */
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/* FT_Outline_Translate */
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/* FT_Outline_Transform */
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/* FT_Outline_Embolden */
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/* FT_Outline_Reverse */
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/* FT_Outline_Check */
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/* */
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/* FT_Outline_Get_CBox */
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/* FT_Outline_Get_BBox */
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/* */
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/* FT_Outline_Get_Bitmap */
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/* FT_Outline_Render */
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/* */
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/* FT_Outline_Decompose */
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/* FT_Outline_Funcs */
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/* FT_Outline_MoveTo_Func */
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/* FT_Outline_LineTo_Func */
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/* FT_Outline_ConicTo_Func */
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/* FT_Outline_CubicTo_Func */
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/* */
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/*************************************************************************/
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Outline_Decompose */
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/* */
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/* <Description> */
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/* Walk over an outline's structure to decompose it into individual */
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/* segments and Bézier arcs. This function also emits `move to' */
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/* operations to indicate the start of new contours in the outline. */
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/* */
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/* <Input> */
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/* outline :: A pointer to the source target. */
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/* */
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/* func_interface :: A table of `emitters', i.e., function pointers */
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/* called during decomposition to indicate path */
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/* operations. */
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/* */
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/* <InOut> */
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/* user :: A typeless pointer which is passed to each */
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/* emitter during the decomposition. It can be */
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/* used to store the state during the */
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/* decomposition. */
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/* */
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/* <Return> */
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/* FreeType error code. 0~means success. */
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/* */
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FT_EXPORT( FT_Error )
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FT_Outline_Decompose( FT_Outline* outline,
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const FT_Outline_Funcs* func_interface,
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void* user );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Outline_New */
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/* */
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/* <Description> */
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/* Create a new outline of a given size. */
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/* */
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/* <Input> */
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/* library :: A handle to the library object from where the */
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/* outline is allocated. Note however that the new */
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/* outline will *not* necessarily be *freed*, when */
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/* destroying the library, by @FT_Done_FreeType. */
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/* */
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/* numPoints :: The maximal number of points within the outline. */
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/* */
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/* numContours :: The maximal number of contours within the outline. */
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/* */
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/* <Output> */
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/* anoutline :: A handle to the new outline. */
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/* */
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/* <Return> */
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/* FreeType error code. 0~means success. */
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/* */
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/* <Note> */
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/* The reason why this function takes a `library' parameter is simply */
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/* to use the library's memory allocator. */
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/* */
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FT_EXPORT( FT_Error )
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FT_Outline_New( FT_Library library,
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FT_UInt numPoints,
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FT_Int numContours,
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FT_Outline *anoutline );
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FT_EXPORT( FT_Error )
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FT_Outline_New_Internal( FT_Memory memory,
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FT_UInt numPoints,
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FT_Int numContours,
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FT_Outline *anoutline );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Outline_Done */
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/* */
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/* <Description> */
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/* Destroy an outline created with @FT_Outline_New. */
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/* */
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/* <Input> */
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/* library :: A handle of the library object used to allocate the */
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/* outline. */
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/* */
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/* outline :: A pointer to the outline object to be discarded. */
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/* */
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/* <Return> */
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/* FreeType error code. 0~means success. */
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/* */
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/* <Note> */
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/* If the outline's `owner' field is not set, only the outline */
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/* descriptor will be released. */
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/* */
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/* The reason why this function takes an `library' parameter is */
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/* simply to use ft_mem_free(). */
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/* */
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FT_EXPORT( FT_Error )
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FT_Outline_Done( FT_Library library,
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FT_Outline* outline );
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FT_EXPORT( FT_Error )
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FT_Outline_Done_Internal( FT_Memory memory,
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FT_Outline* outline );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Outline_Check */
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/* */
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/* <Description> */
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/* Check the contents of an outline descriptor. */
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/* */
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/* <Input> */
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/* outline :: A handle to a source outline. */
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/* */
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/* <Return> */
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/* FreeType error code. 0~means success. */
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/* */
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FT_EXPORT( FT_Error )
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FT_Outline_Check( FT_Outline* outline );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Outline_Get_CBox */
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/* */
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/* <Description> */
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/* Return an outline's `control box'. The control box encloses all */
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/* the outline's points, including Bézier control points. Though it */
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/* coincides with the exact bounding box for most glyphs, it can be */
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/* slightly larger in some situations (like when rotating an outline */
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/* which contains Bézier outside arcs). */
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/* */
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/* Computing the control box is very fast, while getting the bounding */
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/* box can take much more time as it needs to walk over all segments */
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/* and arcs in the outline. To get the latter, you can use the */
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/* `ftbbox' component which is dedicated to this single task. */
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/* */
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/* <Input> */
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/* outline :: A pointer to the source outline descriptor. */
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/* */
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/* <Output> */
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/* acbox :: The outline's control box. */
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/* */
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/* <Note> */
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/* See @FT_Glyph_Get_CBox for a discussion of tricky fonts. */
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/* */
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FT_EXPORT( void )
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FT_Outline_Get_CBox( const FT_Outline* outline,
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FT_BBox *acbox );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Outline_Translate */
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/* */
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/* <Description> */
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/* Apply a simple translation to the points of an outline. */
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/* */
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/* <InOut> */
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/* outline :: A pointer to the target outline descriptor. */
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/* */
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/* <Input> */
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/* xOffset :: The horizontal offset. */
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/* */
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/* yOffset :: The vertical offset. */
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/* */
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FT_EXPORT( void )
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FT_Outline_Translate( const FT_Outline* outline,
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FT_Pos xOffset,
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FT_Pos yOffset );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Outline_Copy */
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/* */
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/* <Description> */
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/* Copy an outline into another one. Both objects must have the */
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/* same sizes (number of points & number of contours) when this */
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/* function is called. */
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/* */
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/* <Input> */
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/* source :: A handle to the source outline. */
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/* */
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/* <Output> */
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/* target :: A handle to the target outline. */
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/* */
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/* <Return> */
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/* FreeType error code. 0~means success. */
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/* */
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FT_EXPORT( FT_Error )
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FT_Outline_Copy( const FT_Outline* source,
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FT_Outline *target );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Outline_Transform */
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/* */
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/* <Description> */
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/* Apply a simple 2x2 matrix to all of an outline's points. Useful */
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/* for applying rotations, slanting, flipping, etc. */
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/* */
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/* <InOut> */
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/* outline :: A pointer to the target outline descriptor. */
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/* */
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/* <Input> */
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/* matrix :: A pointer to the transformation matrix. */
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/* */
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/* <Note> */
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/* You can use @FT_Outline_Translate if you need to translate the */
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/* outline's points. */
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/* */
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FT_EXPORT( void )
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FT_Outline_Transform( const FT_Outline* outline,
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const FT_Matrix* matrix );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Outline_Embolden */
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/* */
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/* <Description> */
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/* Embolden an outline. The new outline will be at most 4~times */
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/* `strength' pixels wider and higher. You may think of the left and */
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/* bottom borders as unchanged. */
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/* */
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/* Negative `strength' values to reduce the outline thickness are */
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/* possible also. */
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/* */
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/* <InOut> */
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/* outline :: A handle to the target outline. */
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/* */
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/* <Input> */
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/* strength :: How strong the glyph is emboldened. Expressed in */
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/* 26.6 pixel format. */
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/* */
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/* <Return> */
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/* FreeType error code. 0~means success. */
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/* */
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/* <Note> */
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/* The used algorithm to increase or decrease the thickness of the */
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/* glyph doesn't change the number of points; this means that certain */
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/* situations like acute angles or intersections are sometimes */
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/* handled incorrectly. */
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/* */
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/* If you need `better' metrics values you should call */
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/* @FT_Outline_Get_CBox or @FT_Outline_Get_BBox. */
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/* */
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/* Example call: */
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/* */
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/* { */
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/* FT_Load_Glyph( face, index, FT_LOAD_DEFAULT ); */
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/* if ( face->slot->format == FT_GLYPH_FORMAT_OUTLINE ) */
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/* FT_Outline_Embolden( &face->slot->outline, strength ); */
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/* } */
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/* */
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FT_EXPORT( FT_Error )
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FT_Outline_Embolden( FT_Outline* outline,
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FT_Pos strength );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Outline_Reverse */
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/* */
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/* <Description> */
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/* Reverse the drawing direction of an outline. This is used to */
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/* ensure consistent fill conventions for mirrored glyphs. */
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/* */
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/* <InOut> */
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/* outline :: A pointer to the target outline descriptor. */
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/* */
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/* <Note> */
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/* This function toggles the bit flag @FT_OUTLINE_REVERSE_FILL in */
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/* the outline's `flags' field. */
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/* */
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/* It shouldn't be used by a normal client application, unless it */
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/* knows what it is doing. */
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/* */
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FT_EXPORT( void )
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FT_Outline_Reverse( FT_Outline* outline );
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374 |
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/*************************************************************************/
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377 |
/* */
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378 |
/* <Function> */
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|
379 |
/* FT_Outline_Get_Bitmap */
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|
380 |
/* */
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|
381 |
/* <Description> */
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|
382 |
/* Render an outline within a bitmap. The outline's image is simply */
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|
383 |
/* OR-ed to the target bitmap. */
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|
384 |
/* */
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385 |
/* <Input> */
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|
386 |
/* library :: A handle to a FreeType library object. */
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|
387 |
/* */
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|
388 |
/* outline :: A pointer to the source outline descriptor. */
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|
389 |
/* */
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|
390 |
/* <InOut> */
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|
391 |
/* abitmap :: A pointer to the target bitmap descriptor. */
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|
392 |
/* */
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393 |
/* <Return> */
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|
394 |
/* FreeType error code. 0~means success. */
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|
395 |
/* */
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396 |
/* <Note> */
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|
397 |
/* This function does NOT CREATE the bitmap, it only renders an */
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|
398 |
/* outline image within the one you pass to it! Consequently, the */
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|
399 |
/* various fields in `abitmap' should be set accordingly. */
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|
400 |
/* */
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|
401 |
/* It will use the raster corresponding to the default glyph format. */
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|
402 |
/* */
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|
403 |
/* The value of the `num_grays' field in `abitmap' is ignored. If */
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|
404 |
/* you select the gray-level rasterizer, and you want less than 256 */
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|
405 |
/* gray levels, you have to use @FT_Outline_Render directly. */
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|
406 |
/* */
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|
407 |
FT_EXPORT( FT_Error )
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|
408 |
FT_Outline_Get_Bitmap( FT_Library library,
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|
409 |
FT_Outline* outline,
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|
410 |
const FT_Bitmap *abitmap );
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|
411 |
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|
412 |
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|
413 |
/*************************************************************************/
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|
414 |
/* */
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|
415 |
/* <Function> */
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|
416 |
/* FT_Outline_Render */
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|
417 |
/* */
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|
418 |
/* <Description> */
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|
419 |
/* Render an outline within a bitmap using the current scan-convert. */
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|
420 |
/* This function uses an @FT_Raster_Params structure as an argument, */
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|
421 |
/* allowing advanced features like direct composition, translucency, */
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|
422 |
/* etc. */
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|
423 |
/* */
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|
424 |
/* <Input> */
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|
425 |
/* library :: A handle to a FreeType library object. */
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|
426 |
/* */
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|
427 |
/* outline :: A pointer to the source outline descriptor. */
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|
428 |
/* */
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|
|
429 |
/* <InOut> */
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|
430 |
/* params :: A pointer to an @FT_Raster_Params structure used to */
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|
431 |
/* describe the rendering operation. */
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|
432 |
/* */
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|
433 |
/* <Return> */
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|
434 |
/* FreeType error code. 0~means success. */
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|
435 |
/* */
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|
436 |
/* <Note> */
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|
437 |
/* You should know what you are doing and how @FT_Raster_Params works */
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|
438 |
/* to use this function. */
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|
|
439 |
/* */
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|
|
440 |
/* The field `params.source' will be set to `outline' before the scan */
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|
441 |
/* converter is called, which means that the value you give to it is */
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|
442 |
/* actually ignored. */
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|
443 |
/* */
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|
444 |
/* The gray-level rasterizer always uses 256 gray levels. If you */
|
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|
445 |
/* want less gray levels, you have to provide your own span callback. */
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|
446 |
/* See the @FT_RASTER_FLAG_DIRECT value of the `flags' field in the */
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|
447 |
/* @FT_Raster_Params structure for more details. */
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|
|
448 |
/* */
|
|
|
449 |
FT_EXPORT( FT_Error )
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|
|
450 |
FT_Outline_Render( FT_Library library,
|
|
|
451 |
FT_Outline* outline,
|
|
|
452 |
FT_Raster_Params* params );
|
|
|
453 |
|
|
|
454 |
|
|
|
455 |
/**************************************************************************
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|
456 |
*
|
|
|
457 |
* @enum:
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|
458 |
* FT_Orientation
|
|
|
459 |
*
|
|
|
460 |
* @description:
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|
|
461 |
* A list of values used to describe an outline's contour orientation.
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|
462 |
*
|
|
|
463 |
* The TrueType and PostScript specifications use different conventions
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|
464 |
* to determine whether outline contours should be filled or unfilled.
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|
|
465 |
*
|
|
|
466 |
* @values:
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|
|
467 |
* FT_ORIENTATION_TRUETYPE ::
|
|
|
468 |
* According to the TrueType specification, clockwise contours must
|
|
|
469 |
* be filled, and counter-clockwise ones must be unfilled.
|
|
|
470 |
*
|
|
|
471 |
* FT_ORIENTATION_POSTSCRIPT ::
|
|
|
472 |
* According to the PostScript specification, counter-clockwise contours
|
|
|
473 |
* must be filled, and clockwise ones must be unfilled.
|
|
|
474 |
*
|
|
|
475 |
* FT_ORIENTATION_FILL_RIGHT ::
|
|
|
476 |
* This is identical to @FT_ORIENTATION_TRUETYPE, but is used to
|
|
|
477 |
* remember that in TrueType, everything that is to the right of
|
|
|
478 |
* the drawing direction of a contour must be filled.
|
|
|
479 |
*
|
|
|
480 |
* FT_ORIENTATION_FILL_LEFT ::
|
|
|
481 |
* This is identical to @FT_ORIENTATION_POSTSCRIPT, but is used to
|
|
|
482 |
* remember that in PostScript, everything that is to the left of
|
|
|
483 |
* the drawing direction of a contour must be filled.
|
|
|
484 |
*
|
|
|
485 |
* FT_ORIENTATION_NONE ::
|
|
|
486 |
* The orientation cannot be determined. That is, different parts of
|
|
|
487 |
* the glyph have different orientation.
|
|
|
488 |
*
|
|
|
489 |
*/
|
|
|
490 |
typedef enum FT_Orientation_
|
|
|
491 |
{
|
|
|
492 |
FT_ORIENTATION_TRUETYPE = 0,
|
|
|
493 |
FT_ORIENTATION_POSTSCRIPT = 1,
|
|
|
494 |
FT_ORIENTATION_FILL_RIGHT = FT_ORIENTATION_TRUETYPE,
|
|
|
495 |
FT_ORIENTATION_FILL_LEFT = FT_ORIENTATION_POSTSCRIPT,
|
|
|
496 |
FT_ORIENTATION_NONE
|
|
|
497 |
|
|
|
498 |
} FT_Orientation;
|
|
|
499 |
|
|
|
500 |
|
|
|
501 |
/**************************************************************************
|
|
|
502 |
*
|
|
|
503 |
* @function:
|
|
|
504 |
* FT_Outline_Get_Orientation
|
|
|
505 |
*
|
|
|
506 |
* @description:
|
|
|
507 |
* This function analyzes a glyph outline and tries to compute its
|
|
|
508 |
* fill orientation (see @FT_Orientation). This is done by computing
|
|
|
509 |
* the direction of each global horizontal and/or vertical extrema
|
|
|
510 |
* within the outline.
|
|
|
511 |
*
|
|
|
512 |
* Note that this will return @FT_ORIENTATION_TRUETYPE for empty
|
|
|
513 |
* outlines.
|
|
|
514 |
*
|
|
|
515 |
* @input:
|
|
|
516 |
* outline ::
|
|
|
517 |
* A handle to the source outline.
|
|
|
518 |
*
|
|
|
519 |
* @return:
|
|
|
520 |
* The orientation.
|
|
|
521 |
*
|
|
|
522 |
*/
|
|
|
523 |
FT_EXPORT( FT_Orientation )
|
|
|
524 |
FT_Outline_Get_Orientation( FT_Outline* outline );
|
|
|
525 |
|
|
|
526 |
|
|
|
527 |
/* */
|
|
|
528 |
|
|
|
529 |
|
|
|
530 |
FT_END_HEADER
|
|
|
531 |
|
|
|
532 |
#endif /* __FTOUTLN_H__ */
|
|
|
533 |
|
|
|
534 |
|
|
|
535 |
/* END */
|
|
|
536 |
|
|
|
537 |
|
|
|
538 |
/* Local Variables: */
|
|
|
539 |
/* coding: utf-8 */
|
|
|
540 |
/* End: */
|