freetype2/src/base/ftsynth.c

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/****************************************************************************
*
* ftsynth.c
*
* FreeType synthesizing code for emboldening and slanting (body).
*
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* Copyright (C) 2000-2021 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.
*
*/
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#include <freetype/ftsynth.h>
#include <freetype/internal/ftdebug.h>
#include <freetype/internal/ftobjs.h>
#include <freetype/ftoutln.h>
#include <freetype/ftbitmap.h>
/**************************************************************************
*
* The macro FT_COMPONENT is used in trace mode. It is an implicit
* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log
* messages during execution.
*/
#undef FT_COMPONENT
#define FT_COMPONENT synth
/*************************************************************************/
/*************************************************************************/
/**** ****/
/**** EXPERIMENTAL OBLIQUING SUPPORT ****/
/**** ****/
/*************************************************************************/
/*************************************************************************/
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/* documentation is in ftsynth.h */
FT_EXPORT_DEF( void )
FT_GlyphSlot_Oblique( FT_GlyphSlot slot )
{
FT_Matrix transform;
FT_Outline* outline;
if ( !slot )
return;
outline = &slot->outline;
/* only oblique outline glyphs */
if ( slot->format != FT_GLYPH_FORMAT_OUTLINE )
return;
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/* we don't touch the advance width */
/* For italic, simply apply a shear transform, with an angle */
/* of about 12 degrees. */
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transform.xx = 0x10000L;
transform.yx = 0x00000L;
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transform.xy = 0x0366AL;
transform.yy = 0x10000L;
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FT_Outline_Transform( outline, &transform );
}
/*************************************************************************/
/*************************************************************************/
/**** ****/
/**** EXPERIMENTAL EMBOLDENING SUPPORT ****/
/**** ****/
/*************************************************************************/
/*************************************************************************/
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/* documentation is in ftsynth.h */
FT_EXPORT_DEF( void )
FT_GlyphSlot_Embolden( FT_GlyphSlot slot )
{
FT_Library library;
FT_Face face;
FT_Error error;
FT_Pos xstr, ystr;
if ( !slot )
return;
library = slot->library;
face = slot->face;
if ( slot->format != FT_GLYPH_FORMAT_OUTLINE &&
slot->format != FT_GLYPH_FORMAT_BITMAP )
return;
/* some reasonable strength */
xstr = FT_MulFix( face->units_per_EM,
* src/base/ftoutln.c (FT_Outline_Embolden): Strength should be halved. * src/base/ftsynth.c (FT_GlyphSlot_Embolden): Change the default strength. Don't increase slot->advance.y. * include/freetype/freetype.h (FREETYPE_MINOR): Set to 2. (FREETYPE_PATCH): Set to 0. * builds/unix/configure.ac (version_info): Set to 9:9:3. Currently, we are still binary compatible. * builds/win32/visualc/index.html, builds/win32/visualc/freetype.dsp, builds/win32/visualc/freetype.vcproj: s/219/2110/, s/2.1.9/2.1.10/. * builds/freetype.mk (refdoc), README, Jamfile (RefDoc): s/2.1.9/2.1.10/. * docs/CHANGES, docs/VERSION.DLL: Updated. * ChangeLog: Split off older entries into... * ChangeLog.20, ChangeLog.21: These new files. The next release will be 2.2.0, so don't worry about source code backwards compatibility. * include/freetype/ftimage.h (FT_Outline_MoveToFunc, FT_Outline_LineToFunc, FT_Outline_ConicToFunc, FT_Outline_CubicToFunc, FT_SpanFunc, FT_Raster_RenderFunc), include/freetype/ftrender.h (FT_Glyph_TransformFunc, FT_Renderer_RenderFunc, FT_Renderer_TransformFunc): Decorate parameters with `const' where appropriate. * src/sfnt/ttsbit.c (tt_face_load_sbit_image): Compute vertBearingY to make glyphs centered vertically. * src/truetype/ttgload.c (compute_glyph_metrics): Compute vertBearingY to make glyphs centered vertically. Fix some bugs in vertical metrics: . loader->pp3.y and loader->pp4.y are in 26.6 format, not in font units. . As we use the glyph's cbox to calculate the top bearing now there iss no need to adjust `top'. * src/otvalid/otvcommn.h (OTV_OPTIONAL_TABLE): Use FT_UShort to be in sync with OTV_OPTIONAL_OFFSET. Reported by YAMATO Masatake. * docs/release: Update.
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face->size->metrics.y_scale ) / 24;
ystr = xstr;
if ( slot->format == FT_GLYPH_FORMAT_OUTLINE )
FT_Outline_EmboldenXY( &slot->outline, xstr, ystr );
else /* slot->format == FT_GLYPH_FORMAT_BITMAP */
{
/* round to full pixels */
xstr &= ~63;
if ( xstr == 0 )
xstr = 1 << 6;
ystr &= ~63;
/*
* XXX: overflow check for 16-bit system, for compatibility
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* with FT_GlyphSlot_Embolden() since FreeType 2.1.10.
* unfortunately, this function return no informations
* about the cause of error.
*/
if ( ( ystr >> 6 ) > FT_INT_MAX || ( ystr >> 6 ) < FT_INT_MIN )
{
FT_TRACE1(( "FT_GlyphSlot_Embolden:" ));
FT_TRACE1(( "too strong emboldening parameter ystr=%ld\n", ystr ));
return;
}
error = FT_GlyphSlot_Own_Bitmap( slot );
if ( error )
return;
error = FT_Bitmap_Embolden( library, &slot->bitmap, xstr, ystr );
if ( error )
return;
}
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if ( slot->advance.x )
slot->advance.x += xstr;
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if ( slot->advance.y )
slot->advance.y += ystr;
slot->metrics.width += xstr;
slot->metrics.height += ystr;
slot->metrics.horiAdvance += xstr;
slot->metrics.vertAdvance += ystr;
slot->metrics.horiBearingY += ystr;
/* XXX: 16-bit overflow case must be excluded before here */
if ( slot->format == FT_GLYPH_FORMAT_BITMAP )
slot->bitmap_top += (FT_Int)( ystr >> 6 );
}
/* END */