ooops. Add missing files
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David Turner
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/***************************************************************************/
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/* */
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/* ftadvanc.h */
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/* */
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/* FreeType access the glyph advances (specification only). */
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/* */
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/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007 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 __FREETYPE_ADVANCE_H__
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#define __FREETYPE_ADVANCE_H__
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#include <ft2build.h>
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#include FT_FREETYPE_H
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/*************************************************************************/
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/* */
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/* <Const> */
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/* FT_ADVANCE_FLAG_FAST_ONLY */
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/* */
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/* <Description> */
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/* a bit-flag to be or-ed to the 'flags' parameter of the */
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/* @FT_Get_Advance and @FT_Get_Advances. */
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/* */
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/* when set, it indicates that you want these functions to fail */
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/* if the corresponding hinting mode or font driver doesn't */
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/* allow for very quick advance computation. */
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/* */
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/* typically, unscaled, unhinted, bitmapped and light-hinted glyphs */
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/* can have their advance width(s) computed very quickly. */
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/* */
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/* not so for normal and bytecode hinted modes, which require */
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/* loading/scaling/hinting the glyph outline instead, which is */
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/* extremely slow by comparison */
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/* */
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#define FT_ADVANCE_FLAG_FAST_ONLY 0x20000000U
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Get_Advance */
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/* */
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/* <Description> */
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/* Retrieve the advance of a given glyph outline in a @FT_Face. */
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/* by default, the unhinted advance is returned in font units */
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/* */
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/* <Input> */
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/* face :: source @FT_Face handle */
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/* gindex :: glyph index */
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/* load_flags :: a set of bit-flags similar to those used */
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/* when calling @FT_Load_Glyph, used to determine */
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/* what kind of advances you need. */
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/* <Output> */
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/* padvance :: the advance value, in either font units or 16.16 */
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/* format. */
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/* */
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/* if @FT_LOAD_VERTICAL_LAYOUT is set, this is the */
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/* vertical advance corresponding to a vertical layout. */
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/* otherwise, it's the horizontal advance in an */
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/* horizontal layout. */
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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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/* This function may fail if you use @FT_ADVANCE_FLAG_FAST_ONLY and */
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/* if the corresponding's font backend doesn't have a quick way to */
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/* retrieve the advances. */
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/* */
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/* A scaled advance is returned in 16.16 format, but isn't */
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/* transformed by the affine transform specified by @FT_Set_Transform */
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/* */
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FT_EXPORT( FT_Error )
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FT_Get_Advance( FT_Face face,
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FT_UInt gindex,
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FT_UInt load_flags,
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FT_Fixed *padvance );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Get_Advances */
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/* */
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/* <Description> */
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/* Retrieve the advance of several glyph outlines in a @FT_Face. */
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/* by default, the unhinted advances are returned in font units */
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/* */
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/* <Input> */
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/* face :: source @FT_Face handle */
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/* start :: first glyph index */
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/* count :: number of advances you want to retrieve */
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/* load_flags :: a set of bit-flags similar to those used when */
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/* calling @FT_Load_Glyph. */
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/* */
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/* <Output> */
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/* padvance :: the advances, in either font units or 16.16 format. */
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/* this array must contain at least 'count' elements */
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/* */
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/* if @FT_LOAD_VERTICAL_LAYOUT is set, these are the */
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/* vertical advances corresponding to a vertical layout. */
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/* otherwise, they are the horizontal advances in an */
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/* horizontal layout. */
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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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/* This function may fail if you use @FT_ADVANCE_FLAG_FAST_ONLY and */
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/* if the corresponding's font backend doesn't have a quick way to */
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/* retrieve the advances. */
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/* */
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/* Scaled advances are returned in 16.16 format, but aren't */
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/* transformed by the affine transform specified by @FT_Set_Transform */
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/* */
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FT_EXPORT( FT_Error )
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FT_Get_Advances( FT_Face face,
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FT_UInt start,
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FT_UInt count,
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FT_UInt load_flags,
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FT_Fixed *padvances );
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/* */
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#endif /* __FREETYPE_ADVANCE_H__ */
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@ -0,0 +1,127 @@
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#include <ft2build.h>
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#include FT_ADVANCES_H
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#include FT_INTERNAL_OBJECTS_H
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static FT_Error
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_ft_face_scale_advances( FT_Face face,
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FT_Fixed* advances,
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FT_UInt count,
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FT_UInt flags )
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{
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FT_Fixed scale;
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FT_UInt nn;
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if ( (flags & FT_LOAD_NO_SCALE) )
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return FT_Err_Ok;
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if ( face->size == NULL )
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return FT_Err_Invalid_Size_Handle;
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if ( !(flags & FT_LOAD_VERTICAL_LAYOUT) )
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scale = face->size->metrics.x_scale;
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else
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scale = face->size->metrics.y_scale;
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/* this must be the same computation than to get linearHori/VertAdvance
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* (see FT_Load_Glyph() implementation in src/base/ftobjs.c */
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for (nn = 0; nn < count; nn++)
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advances[nn] = FT_MulDiv( advances[nn], scale, 64 );
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return 0;
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}
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/* at the moment, we can perform fast advance retrieval only in
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the following cases:
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- unscaled load
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- unhinted load
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- light-hinted load
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*/
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#define LOAD_ADVANCE_FAST_CHECK(flags) \
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(((flags & (FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING)) != 0) || \
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FT_LOAD_TARGET_MODE(flags) == FT_RENDER_MODE_LIGHT)
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FT_EXPORT_DEF(FT_Error)
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FT_Get_Advance( FT_Face face,
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FT_UInt gindex,
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FT_UInt flags,
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FT_Fixed *padvance )
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{
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FT_Face_GetAdvancesFunc func;
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if ( !face )
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return FT_Err_Invalid_Face_Handle;
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if (gindex >= (FT_UInt) face->num_glyphs )
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return FT_Err_Invalid_Glyph_Index;
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func = face->driver->clazz->get_advances;
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if (func != NULL && LOAD_ADVANCE_FAST_CHECK(flags))
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{
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FT_Error error;
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error = func( face, gindex, 1, flags, padvance );
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if (!error)
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return _ft_face_scale_advances( face, padvance, 1, flags );
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if (error != FT_Err_Unimplemented_Feature)
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return error;
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}
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return FT_Get_Advances( face, gindex, 1, flags, padvance );
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}
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FT_EXPORT_DEF(FT_Error)
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FT_Get_Advances( FT_Face face,
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FT_UInt start,
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FT_UInt count,
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FT_UInt flags,
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FT_Fixed *padvances )
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{
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FT_Face_GetAdvancesFunc func;
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FT_UInt num, end, nn;
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FT_Error error = 0;
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if ( !face )
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return FT_Err_Invalid_Face_Handle;
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num = (FT_UInt) face->num_glyphs;
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end = start + count;
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if (start >= num || end < start || end > num)
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return FT_Err_Invalid_Glyph_Index;
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if (count == 0)
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return FT_Err_Ok;
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func = face->driver->clazz->get_advances;
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if (func != NULL && LOAD_ADVANCE_FAST_CHECK(flags))
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{
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error = func( face, start, count, flags, padvances );
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if (!error) goto Exit;
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if (error != FT_Err_Unimplemented_Feature)
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return error;
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}
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error = 0;
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if ((flags & FT_ADVANCE_FLAG_FAST_ONLY) != 0)
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return FT_Err_Unimplemented_Feature;
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flags |= FT_LOAD_ADVANCE_ONLY;
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for (nn = 0; nn < count; nn++)
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{
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error = FT_Load_Glyph( face, start+nn, flags );
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if (error) break;
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padvances[nn] = (flags & FT_LOAD_VERTICAL_LAYOUT)
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? face->glyph->advance.x
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: face->glyph->advance.y;
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}
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if (error) return error;
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Exit:
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return _ft_face_scale_advances( face, padvances, count, flags );
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}
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