forked from minhngoc25a/freetype2
658 lines
17 KiB
C
658 lines
17 KiB
C
/****************************************************************************
|
|
*
|
|
* ftglyph.c
|
|
*
|
|
* FreeType convenience functions to handle glyphs (body).
|
|
*
|
|
* Copyright (C) 1996-2020 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.
|
|
*
|
|
*/
|
|
|
|
|
|
#include <freetype/internal/ftdebug.h>
|
|
|
|
#include <freetype/ftglyph.h>
|
|
#include <freetype/ftoutln.h>
|
|
#include <freetype/ftbitmap.h>
|
|
#include <freetype/internal/ftobjs.h>
|
|
|
|
#include "ftbase.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 glyph
|
|
|
|
|
|
/*************************************************************************/
|
|
/*************************************************************************/
|
|
/**** ****/
|
|
/**** FT_BitmapGlyph support ****/
|
|
/**** ****/
|
|
/*************************************************************************/
|
|
/*************************************************************************/
|
|
|
|
FT_CALLBACK_DEF( FT_Error )
|
|
ft_bitmap_glyph_init( FT_Glyph bitmap_glyph,
|
|
FT_GlyphSlot slot )
|
|
{
|
|
FT_BitmapGlyph glyph = (FT_BitmapGlyph)bitmap_glyph;
|
|
FT_Error error = FT_Err_Ok;
|
|
FT_Library library = FT_GLYPH( glyph )->library;
|
|
|
|
|
|
if ( slot->format != FT_GLYPH_FORMAT_BITMAP )
|
|
{
|
|
error = FT_THROW( Invalid_Glyph_Format );
|
|
goto Exit;
|
|
}
|
|
|
|
glyph->left = slot->bitmap_left;
|
|
glyph->top = slot->bitmap_top;
|
|
|
|
/* do lazy copying whenever possible */
|
|
if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP )
|
|
{
|
|
glyph->bitmap = slot->bitmap;
|
|
slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP;
|
|
}
|
|
else
|
|
{
|
|
FT_Bitmap_Init( &glyph->bitmap );
|
|
error = FT_Bitmap_Copy( library, &slot->bitmap, &glyph->bitmap );
|
|
}
|
|
|
|
Exit:
|
|
return error;
|
|
}
|
|
|
|
|
|
FT_CALLBACK_DEF( FT_Error )
|
|
ft_bitmap_glyph_copy( FT_Glyph bitmap_source,
|
|
FT_Glyph bitmap_target )
|
|
{
|
|
FT_Library library = bitmap_source->library;
|
|
FT_BitmapGlyph source = (FT_BitmapGlyph)bitmap_source;
|
|
FT_BitmapGlyph target = (FT_BitmapGlyph)bitmap_target;
|
|
|
|
|
|
target->left = source->left;
|
|
target->top = source->top;
|
|
|
|
return FT_Bitmap_Copy( library, &source->bitmap, &target->bitmap );
|
|
}
|
|
|
|
|
|
FT_CALLBACK_DEF( void )
|
|
ft_bitmap_glyph_done( FT_Glyph bitmap_glyph )
|
|
{
|
|
FT_BitmapGlyph glyph = (FT_BitmapGlyph)bitmap_glyph;
|
|
FT_Library library = FT_GLYPH( glyph )->library;
|
|
|
|
|
|
FT_Bitmap_Done( library, &glyph->bitmap );
|
|
}
|
|
|
|
|
|
FT_CALLBACK_DEF( void )
|
|
ft_bitmap_glyph_bbox( FT_Glyph bitmap_glyph,
|
|
FT_BBox* cbox )
|
|
{
|
|
FT_BitmapGlyph glyph = (FT_BitmapGlyph)bitmap_glyph;
|
|
|
|
|
|
cbox->xMin = glyph->left * 64;
|
|
cbox->xMax = cbox->xMin + (FT_Pos)( glyph->bitmap.width * 64 );
|
|
cbox->yMax = glyph->top * 64;
|
|
cbox->yMin = cbox->yMax - (FT_Pos)( glyph->bitmap.rows * 64 );
|
|
}
|
|
|
|
|
|
FT_DEFINE_GLYPH(
|
|
ft_bitmap_glyph_class,
|
|
|
|
sizeof ( FT_BitmapGlyphRec ),
|
|
FT_GLYPH_FORMAT_BITMAP,
|
|
|
|
ft_bitmap_glyph_init, /* FT_Glyph_InitFunc glyph_init */
|
|
ft_bitmap_glyph_done, /* FT_Glyph_DoneFunc glyph_done */
|
|
ft_bitmap_glyph_copy, /* FT_Glyph_CopyFunc glyph_copy */
|
|
NULL, /* FT_Glyph_TransformFunc glyph_transform */
|
|
ft_bitmap_glyph_bbox, /* FT_Glyph_GetBBoxFunc glyph_bbox */
|
|
NULL /* FT_Glyph_PrepareFunc glyph_prepare */
|
|
)
|
|
|
|
|
|
/*************************************************************************/
|
|
/*************************************************************************/
|
|
/**** ****/
|
|
/**** FT_OutlineGlyph support ****/
|
|
/**** ****/
|
|
/*************************************************************************/
|
|
/*************************************************************************/
|
|
|
|
|
|
FT_CALLBACK_DEF( FT_Error )
|
|
ft_outline_glyph_init( FT_Glyph outline_glyph,
|
|
FT_GlyphSlot slot )
|
|
{
|
|
FT_OutlineGlyph glyph = (FT_OutlineGlyph)outline_glyph;
|
|
FT_Error error = FT_Err_Ok;
|
|
FT_Library library = FT_GLYPH( glyph )->library;
|
|
FT_Outline* source = &slot->outline;
|
|
FT_Outline* target = &glyph->outline;
|
|
|
|
|
|
/* check format in glyph slot */
|
|
if ( slot->format != FT_GLYPH_FORMAT_OUTLINE )
|
|
{
|
|
error = FT_THROW( Invalid_Glyph_Format );
|
|
goto Exit;
|
|
}
|
|
|
|
/* allocate new outline */
|
|
error = FT_Outline_New( library,
|
|
(FT_UInt)source->n_points,
|
|
source->n_contours,
|
|
&glyph->outline );
|
|
if ( error )
|
|
goto Exit;
|
|
|
|
FT_Outline_Copy( source, target );
|
|
|
|
Exit:
|
|
return error;
|
|
}
|
|
|
|
|
|
FT_CALLBACK_DEF( void )
|
|
ft_outline_glyph_done( FT_Glyph outline_glyph )
|
|
{
|
|
FT_OutlineGlyph glyph = (FT_OutlineGlyph)outline_glyph;
|
|
|
|
|
|
FT_Outline_Done( FT_GLYPH( glyph )->library, &glyph->outline );
|
|
}
|
|
|
|
|
|
FT_CALLBACK_DEF( FT_Error )
|
|
ft_outline_glyph_copy( FT_Glyph outline_source,
|
|
FT_Glyph outline_target )
|
|
{
|
|
FT_OutlineGlyph source = (FT_OutlineGlyph)outline_source;
|
|
FT_OutlineGlyph target = (FT_OutlineGlyph)outline_target;
|
|
FT_Error error;
|
|
FT_Library library = FT_GLYPH( source )->library;
|
|
|
|
|
|
error = FT_Outline_New( library,
|
|
(FT_UInt)source->outline.n_points,
|
|
source->outline.n_contours,
|
|
&target->outline );
|
|
if ( !error )
|
|
FT_Outline_Copy( &source->outline, &target->outline );
|
|
|
|
return error;
|
|
}
|
|
|
|
|
|
FT_CALLBACK_DEF( void )
|
|
ft_outline_glyph_transform( FT_Glyph outline_glyph,
|
|
const FT_Matrix* matrix,
|
|
const FT_Vector* delta )
|
|
{
|
|
FT_OutlineGlyph glyph = (FT_OutlineGlyph)outline_glyph;
|
|
|
|
|
|
if ( matrix )
|
|
FT_Outline_Transform( &glyph->outline, matrix );
|
|
|
|
if ( delta )
|
|
FT_Outline_Translate( &glyph->outline, delta->x, delta->y );
|
|
}
|
|
|
|
|
|
FT_CALLBACK_DEF( void )
|
|
ft_outline_glyph_bbox( FT_Glyph outline_glyph,
|
|
FT_BBox* bbox )
|
|
{
|
|
FT_OutlineGlyph glyph = (FT_OutlineGlyph)outline_glyph;
|
|
|
|
|
|
FT_Outline_Get_CBox( &glyph->outline, bbox );
|
|
}
|
|
|
|
|
|
FT_CALLBACK_DEF( FT_Error )
|
|
ft_outline_glyph_prepare( FT_Glyph outline_glyph,
|
|
FT_GlyphSlot slot )
|
|
{
|
|
FT_OutlineGlyph glyph = (FT_OutlineGlyph)outline_glyph;
|
|
|
|
|
|
slot->format = FT_GLYPH_FORMAT_OUTLINE;
|
|
slot->outline = glyph->outline;
|
|
slot->outline.flags &= ~FT_OUTLINE_OWNER;
|
|
|
|
return FT_Err_Ok;
|
|
}
|
|
|
|
|
|
FT_DEFINE_GLYPH(
|
|
ft_outline_glyph_class,
|
|
|
|
sizeof ( FT_OutlineGlyphRec ),
|
|
FT_GLYPH_FORMAT_OUTLINE,
|
|
|
|
ft_outline_glyph_init, /* FT_Glyph_InitFunc glyph_init */
|
|
ft_outline_glyph_done, /* FT_Glyph_DoneFunc glyph_done */
|
|
ft_outline_glyph_copy, /* FT_Glyph_CopyFunc glyph_copy */
|
|
ft_outline_glyph_transform, /* FT_Glyph_TransformFunc glyph_transform */
|
|
ft_outline_glyph_bbox, /* FT_Glyph_GetBBoxFunc glyph_bbox */
|
|
ft_outline_glyph_prepare /* FT_Glyph_PrepareFunc glyph_prepare */
|
|
)
|
|
|
|
|
|
/*************************************************************************/
|
|
/*************************************************************************/
|
|
/**** ****/
|
|
/**** FT_Glyph class and API ****/
|
|
/**** ****/
|
|
/*************************************************************************/
|
|
/*************************************************************************/
|
|
|
|
static FT_Error
|
|
ft_new_glyph( FT_Library library,
|
|
const FT_Glyph_Class* clazz,
|
|
FT_Glyph* aglyph )
|
|
{
|
|
FT_Memory memory = library->memory;
|
|
FT_Error error;
|
|
FT_Glyph glyph = NULL;
|
|
|
|
|
|
*aglyph = NULL;
|
|
|
|
if ( !FT_ALLOC( glyph, clazz->glyph_size ) )
|
|
{
|
|
glyph->library = library;
|
|
glyph->clazz = clazz;
|
|
glyph->format = clazz->glyph_format;
|
|
|
|
*aglyph = glyph;
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
|
|
/* documentation is in ftglyph.h */
|
|
|
|
FT_EXPORT_DEF( FT_Error )
|
|
FT_Glyph_Copy( FT_Glyph source,
|
|
FT_Glyph *target )
|
|
{
|
|
FT_Glyph copy;
|
|
FT_Error error;
|
|
const FT_Glyph_Class* clazz;
|
|
|
|
|
|
/* check arguments */
|
|
if ( !target || !source || !source->clazz )
|
|
{
|
|
error = FT_THROW( Invalid_Argument );
|
|
goto Exit;
|
|
}
|
|
|
|
*target = NULL;
|
|
|
|
if ( !source || !source->clazz )
|
|
{
|
|
error = FT_THROW( Invalid_Argument );
|
|
goto Exit;
|
|
}
|
|
|
|
clazz = source->clazz;
|
|
error = ft_new_glyph( source->library, clazz, © );
|
|
if ( error )
|
|
goto Exit;
|
|
|
|
copy->advance = source->advance;
|
|
copy->format = source->format;
|
|
|
|
if ( clazz->glyph_copy )
|
|
error = clazz->glyph_copy( source, copy );
|
|
|
|
if ( error )
|
|
FT_Done_Glyph( copy );
|
|
else
|
|
*target = copy;
|
|
|
|
Exit:
|
|
return error;
|
|
}
|
|
|
|
|
|
/* documentation is in ftglyph.h */
|
|
|
|
FT_EXPORT( FT_Error )
|
|
FT_New_Glyph( FT_Library library,
|
|
FT_Glyph_Format format,
|
|
FT_Glyph *aglyph )
|
|
{
|
|
const FT_Glyph_Class* clazz = NULL;
|
|
|
|
if ( !library || !aglyph )
|
|
return FT_THROW( Invalid_Argument );
|
|
|
|
/* if it is a bitmap, that's easy :-) */
|
|
if ( format == FT_GLYPH_FORMAT_BITMAP )
|
|
clazz = &ft_bitmap_glyph_class;
|
|
|
|
/* if it is an outline */
|
|
else if ( format == FT_GLYPH_FORMAT_OUTLINE )
|
|
clazz = &ft_outline_glyph_class;
|
|
|
|
else
|
|
{
|
|
/* try to find a renderer that supports the glyph image format */
|
|
FT_Renderer render = FT_Lookup_Renderer( library, format, 0 );
|
|
|
|
|
|
if ( render )
|
|
clazz = &render->glyph_class;
|
|
}
|
|
|
|
if ( !clazz )
|
|
return FT_THROW( Invalid_Glyph_Format );
|
|
|
|
/* create FT_Glyph object */
|
|
return ft_new_glyph( library, clazz, aglyph );
|
|
}
|
|
|
|
|
|
/* documentation is in ftglyph.h */
|
|
|
|
FT_EXPORT_DEF( FT_Error )
|
|
FT_Get_Glyph( FT_GlyphSlot slot,
|
|
FT_Glyph *aglyph )
|
|
{
|
|
FT_Error error;
|
|
FT_Glyph glyph;
|
|
|
|
|
|
if ( !slot )
|
|
return FT_THROW( Invalid_Slot_Handle );
|
|
|
|
if ( !aglyph )
|
|
return FT_THROW( Invalid_Argument );
|
|
|
|
/* create FT_Glyph object */
|
|
error = FT_New_Glyph( slot->library, slot->format, &glyph );
|
|
if ( error )
|
|
goto Exit;
|
|
|
|
/* copy advance while converting 26.6 to 16.16 format */
|
|
if ( slot->advance.x >= 0x8000L * 64 ||
|
|
slot->advance.x <= -0x8000L * 64 )
|
|
{
|
|
FT_ERROR(( "FT_Get_Glyph: advance width too large\n" ));
|
|
error = FT_THROW( Invalid_Argument );
|
|
goto Exit2;
|
|
}
|
|
if ( slot->advance.y >= 0x8000L * 64 ||
|
|
slot->advance.y <= -0x8000L * 64 )
|
|
{
|
|
FT_ERROR(( "FT_Get_Glyph: advance height too large\n" ));
|
|
error = FT_THROW( Invalid_Argument );
|
|
goto Exit2;
|
|
}
|
|
|
|
glyph->advance.x = slot->advance.x * 1024;
|
|
glyph->advance.y = slot->advance.y * 1024;
|
|
|
|
/* now import the image from the glyph slot */
|
|
error = glyph->clazz->glyph_init( glyph, slot );
|
|
|
|
Exit2:
|
|
/* if an error occurred, destroy the glyph */
|
|
if ( error )
|
|
FT_Done_Glyph( glyph );
|
|
else
|
|
*aglyph = glyph;
|
|
|
|
Exit:
|
|
return error;
|
|
}
|
|
|
|
|
|
/* documentation is in ftglyph.h */
|
|
|
|
FT_EXPORT_DEF( FT_Error )
|
|
FT_Glyph_Transform( FT_Glyph glyph,
|
|
FT_Matrix* matrix,
|
|
FT_Vector* delta )
|
|
{
|
|
FT_Error error = FT_Err_Ok;
|
|
|
|
|
|
if ( !glyph || !glyph->clazz )
|
|
error = FT_THROW( Invalid_Argument );
|
|
else
|
|
{
|
|
const FT_Glyph_Class* clazz = glyph->clazz;
|
|
|
|
|
|
if ( clazz->glyph_transform )
|
|
{
|
|
/* transform glyph image */
|
|
clazz->glyph_transform( glyph, matrix, delta );
|
|
|
|
/* transform advance vector */
|
|
if ( matrix )
|
|
FT_Vector_Transform( &glyph->advance, matrix );
|
|
}
|
|
else
|
|
error = FT_THROW( Invalid_Glyph_Format );
|
|
}
|
|
return error;
|
|
}
|
|
|
|
|
|
/* documentation is in ftglyph.h */
|
|
|
|
FT_EXPORT_DEF( void )
|
|
FT_Glyph_Get_CBox( FT_Glyph glyph,
|
|
FT_UInt bbox_mode,
|
|
FT_BBox *acbox )
|
|
{
|
|
const FT_Glyph_Class* clazz;
|
|
|
|
|
|
if ( !acbox )
|
|
return;
|
|
|
|
acbox->xMin = acbox->yMin = acbox->xMax = acbox->yMax = 0;
|
|
|
|
if ( !glyph || !glyph->clazz )
|
|
return;
|
|
|
|
clazz = glyph->clazz;
|
|
if ( !clazz->glyph_bbox )
|
|
return;
|
|
|
|
/* retrieve bbox in 26.6 coordinates */
|
|
clazz->glyph_bbox( glyph, acbox );
|
|
|
|
/* perform grid fitting if needed */
|
|
if ( bbox_mode == FT_GLYPH_BBOX_GRIDFIT ||
|
|
bbox_mode == FT_GLYPH_BBOX_PIXELS )
|
|
{
|
|
acbox->xMin = FT_PIX_FLOOR( acbox->xMin );
|
|
acbox->yMin = FT_PIX_FLOOR( acbox->yMin );
|
|
acbox->xMax = FT_PIX_CEIL_LONG( acbox->xMax );
|
|
acbox->yMax = FT_PIX_CEIL_LONG( acbox->yMax );
|
|
}
|
|
|
|
/* convert to integer pixels if needed */
|
|
if ( bbox_mode == FT_GLYPH_BBOX_TRUNCATE ||
|
|
bbox_mode == FT_GLYPH_BBOX_PIXELS )
|
|
{
|
|
acbox->xMin >>= 6;
|
|
acbox->yMin >>= 6;
|
|
acbox->xMax >>= 6;
|
|
acbox->yMax >>= 6;
|
|
}
|
|
}
|
|
|
|
|
|
/* documentation is in ftglyph.h */
|
|
|
|
FT_EXPORT_DEF( FT_Error )
|
|
FT_Glyph_To_Bitmap( FT_Glyph* the_glyph,
|
|
FT_Render_Mode render_mode,
|
|
FT_Vector* origin,
|
|
FT_Bool destroy )
|
|
{
|
|
FT_GlyphSlotRec dummy;
|
|
FT_GlyphSlot_InternalRec dummy_internal;
|
|
FT_Error error = FT_Err_Ok;
|
|
FT_Glyph b, glyph;
|
|
FT_BitmapGlyph bitmap = NULL;
|
|
const FT_Glyph_Class* clazz;
|
|
|
|
FT_Library library;
|
|
|
|
|
|
/* check argument */
|
|
if ( !the_glyph )
|
|
goto Bad;
|
|
glyph = *the_glyph;
|
|
if ( !glyph )
|
|
goto Bad;
|
|
|
|
clazz = glyph->clazz;
|
|
library = glyph->library;
|
|
if ( !library || !clazz )
|
|
goto Bad;
|
|
|
|
/* when called with a bitmap glyph, do nothing and return successfully */
|
|
if ( clazz == &ft_bitmap_glyph_class )
|
|
goto Exit;
|
|
|
|
if ( !clazz->glyph_prepare )
|
|
goto Bad;
|
|
|
|
/* we render the glyph into a glyph bitmap using a `dummy' glyph slot */
|
|
/* then calling FT_Render_Glyph_Internal() */
|
|
|
|
FT_ZERO( &dummy );
|
|
FT_ZERO( &dummy_internal );
|
|
dummy.internal = &dummy_internal;
|
|
dummy.library = library;
|
|
dummy.format = clazz->glyph_format;
|
|
|
|
/* create result bitmap glyph */
|
|
error = ft_new_glyph( library, &ft_bitmap_glyph_class, &b );
|
|
if ( error )
|
|
goto Exit;
|
|
bitmap = (FT_BitmapGlyph)b;
|
|
|
|
#if 1
|
|
/* if `origin' is set, translate the glyph image */
|
|
if ( origin )
|
|
FT_Glyph_Transform( glyph, 0, origin );
|
|
#else
|
|
FT_UNUSED( origin );
|
|
#endif
|
|
|
|
/* prepare dummy slot for rendering */
|
|
error = clazz->glyph_prepare( glyph, &dummy );
|
|
if ( !error )
|
|
error = FT_Render_Glyph_Internal( glyph->library, &dummy, render_mode );
|
|
|
|
#if 1
|
|
if ( !destroy && origin )
|
|
{
|
|
FT_Vector v;
|
|
|
|
|
|
v.x = -origin->x;
|
|
v.y = -origin->y;
|
|
FT_Glyph_Transform( glyph, 0, &v );
|
|
}
|
|
#endif
|
|
|
|
if ( error )
|
|
goto Exit;
|
|
|
|
/* in case of success, copy the bitmap to the glyph bitmap */
|
|
error = ft_bitmap_glyph_init( (FT_Glyph)bitmap, &dummy );
|
|
if ( error )
|
|
goto Exit;
|
|
|
|
/* copy advance */
|
|
bitmap->root.advance = glyph->advance;
|
|
|
|
if ( destroy )
|
|
FT_Done_Glyph( glyph );
|
|
|
|
*the_glyph = FT_GLYPH( bitmap );
|
|
|
|
Exit:
|
|
if ( error && bitmap )
|
|
FT_Done_Glyph( FT_GLYPH( bitmap ) );
|
|
|
|
return error;
|
|
|
|
Bad:
|
|
error = FT_THROW( Invalid_Argument );
|
|
goto Exit;
|
|
}
|
|
|
|
|
|
/* documentation is in ftglyph.h */
|
|
|
|
FT_EXPORT_DEF( void )
|
|
FT_Done_Glyph( FT_Glyph glyph )
|
|
{
|
|
if ( glyph )
|
|
{
|
|
FT_Memory memory = glyph->library->memory;
|
|
const FT_Glyph_Class* clazz = glyph->clazz;
|
|
|
|
|
|
if ( clazz->glyph_done )
|
|
clazz->glyph_done( glyph );
|
|
|
|
FT_FREE( glyph );
|
|
}
|
|
}
|
|
|
|
|
|
/* END */
|