f0df85ba2a
A lot of internal modifications have been performed lately on the
source in order to provide the following enhancements:
- more generic module support:
The FT_Module type is now defined to represent a handle to a given
module. The file <freetype/ftmodule.h> contains the FT_Module_Class
definition, as well as the module-loading public API
The FT_Driver type is still defined, and still represents a pointer
to a font driver. Note that FT_Add_Driver is replaced by FT_Add_Module,
FT_Get_Driver by FT_Get_Module, etc..
- support for generic glyph image types:
The FT_Renderer type is a pointer to a module used to perform various
operations on glyph image.
Each renderer is capable of handling images in a single format
(e.g. ft_glyph_format_outline). Its functions are used to:
- transform an glyph image
- render a glyph image into a bitmap
- return the control box (dimensions) of a given glyph image
The scan converters "ftraster.c" and "ftgrays.c" have been moved
to the new directory "src/renderer", and are used to provide two
default renderer modules.
One corresponds to the "standard" scan-converter, the other to the
"smooth" one.
The current renderer can be set through the new function
FT_Set_Renderer.
The old raster-related function FT_Set_Raster, FT_Get_Raster and
FT_Set_Raster_Mode have now disappeared, in favor of the new:
FT_Get_Renderer
FT_Set_Renderer
see the file <freetype/ftrender.h> for more details..
These changes were necessary to properly support different scalable
formats in the future, like bi-color glyphs, etc..
- glyph loader object:
A new internal object, called a 'glyph loader' has been introduced
in the base layer. It is used by all scalable format font drivers
to load glyphs and composites.
This object has been created to reduce the code size of each driver,
as each one of them basically re-implemented its functionality.
See <freetype/internal/ftobjs.h> and the FT_GlyphLoader type for
more information..
- FT_GlyphSlot had new fields:
In order to support extended features (see below), the FT_GlyphSlot
structure has a few new fields:
linearHoriAdvance: this field gives the linearly scaled (i.e.
scaled but unhinted) advance width for the glyph,
expressed as a 16.16 fixed pixel value. This
is useful to perform WYSIWYG text.
linearVertAdvance: this field gives the linearly scaled advance
height for the glyph (relevant in vertical glyph
layouts only). This is useful to perform
WYSIWYG text.
Note that the two above field replace the removed "metrics2" field
in the glyph slot.
advance: this field is a vector that gives the transformed
advance for the glyph. By default, it corresponds
to the advance width, unless FT_LOAD_VERTICAL_LAYOUT
was specified when calling FT_Load_Glyph or FT_Load_Char
bitmap_left: this field gives the distance in integer pixels from
the current pen position to the left-most pixel of
a glyph image WHEN IT IS A BITMAP. It is only valid
when the "format" field is set to
"ft_glyph_format_bitmap", for example, after calling
the new function FT_Render_Glyph.
bitmap_top: this field gives the distance in integer pixels from
the current pen position (located on the baseline) to
the top-most pixel of the glyph image WHEN IT IS A
BITMAP. Positive values correspond to upwards Y.
loader: this is a new private field for the glyph slot. Client
applications should not touch it..
- support for transforms and direct rendering in FT_Load_Glyph:
Most of the functionality found in <freetype/ftglyph.h> has been
moved to the core library. Hence, the following:
- a transform can be specified for a face through FT_Set_Transform.
this transform is applied by FT_Load_Glyph to scalable glyph images
(i.e. NOT TO BITMAPS) before the function returns, unless the
bit flag FT_LOAD_IGNORE_TRANSFORM was set in the load flags..
- once a glyph image has been loaded, it can be directly converted to
a bitmap by using the new FT_Render_Glyph function. Note that this
function takes the glyph image from the glyph slot, and converts
it to a bitmap whose properties are returned in "face.glyph.bitmap",
"face.glyph.bitmap_left" and "face.glyph.bitmap_top". The original
native image might be lost after the conversion.
- when using the new bit flag FT_LOAD_RENDER, the FT_Load_Glyph
and FT_Load_Char functions will call FT_Render_Glyph automatically
when needed.
494 lines
13 KiB
C
494 lines
13 KiB
C
/*******************************************************************
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*
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* t1objs.c 1.0
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*
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* Type1 Objects manager.
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*
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* Copyright 1996-1998 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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#include <freetype/internal/ftdebug.h>
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#include <freetype/internal/ftstream.h>
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#include <t1gload.h>
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#include <t1load.h>
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#include <t1afm.h>
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#ifndef T1_CONFIG_OPTION_DISABLE_HINTER
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#include <t1hinter.h>
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#endif
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#include <freetype/internal/psnames.h>
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/* Required by tracing mode */
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#undef FT_COMPONENT
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#define FT_COMPONENT trace_t1objs
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/*******************************************************************
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* *
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* SIZE FUNCTIONS *
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* *
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* *
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*******************************************************************/
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/*******************************************************************
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*
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* <Function> T1_Done_Size
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*
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* <Description>
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* The TrueDoc instance object destructor. Used to discard
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* a given instance object..
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*
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* <Input>
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* instance :: handle to the target instance object
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*
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* <Return>
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* TrueDoc error code. 0 means success
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*
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******************************************************************/
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LOCAL_FUNC
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void T1_Done_Size( T1_Size size )
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{
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if (size)
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{
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#ifndef T1_CONFIG_OPTION_DISABLE_HINTER
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T1_Done_Size_Hinter( size );
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#endif
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size->valid = 0;
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}
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}
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/*******************************************************************
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*
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* <Function> T1_Init_Size
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*
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* <Description>
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* The instance object constructor
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*
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* <Input>
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* instance : handle to new instance object
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* face : pointer to parent face object
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*
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* <Return>
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* TrueDoc error code. 0 means success.
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*
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******************************************************************/
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LOCAL_DEF
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FT_Error T1_Init_Size( T1_Size size )
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{
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FT_Error error;
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size->valid = 0;
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#ifndef T1_CONFIG_OPTION_DISABLE_HINTER
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error = T1_New_Size_Hinter( size );
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return error;
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#else
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(void)error;
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return T1_Err_Ok;
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#endif
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}
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/*******************************************************************
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*
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* <Function> T1_Reset_Size
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*
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* <Description>
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* Resets an instance to a new pointsize/transform.
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* This function is in charge of resetting the blue zones,
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* As well as the stem snap tables for a given size..
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*
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* <Input>
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* instance the instance object to destroy
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*
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* <Output>
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* Error code.
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*
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******************************************************************/
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LOCAL_FUNC
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FT_Error T1_Reset_Size( T1_Size size )
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{
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/* recompute ascender, descender, etc.. */
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T1_Face face = (T1_Face)size->root.face;
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FT_Size_Metrics* metrics = &size->root.metrics;
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if ( metrics->x_ppem < 1 || metrics->y_ppem < 1 )
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return FT_Err_Invalid_Argument;
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/* Compute root ascender, descender, test height, and max_advance */
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metrics->ascender = ( FT_MulFix( face->root.ascender,
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metrics->y_scale ) + 32 ) & -64;
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metrics->descender = ( FT_MulFix( face->root.descender,
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metrics->y_scale ) + 32 ) & -64;
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metrics->height = ( FT_MulFix( face->root.height,
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metrics->y_scale ) + 32 ) & -64;
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metrics->max_advance = ( FT_MulFix( face->root.max_advance_width,
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metrics->x_scale ) + 32 ) & -64;
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#ifndef T1_CONFIG_OPTION_DISABLE_HINTER
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return T1_Reset_Size_Hinter( size );
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#else
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return 0;
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#endif
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}
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/*******************************************************************
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* *
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* FACE FUNCTIONS *
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* *
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* *
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*******************************************************************/
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/*******************************************************************
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*
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* <Function> T1_Done_Face
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*
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* <Description>
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* The face object destructor.
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*
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* <Input>
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* face :: typeless pointer to the face object to destroy
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*
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* <Return>
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* Error code.
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*
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******************************************************************/
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LOCAL_FUNC
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void T1_Done_Face( T1_Face face )
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{
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FT_Memory memory;
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T1_Font* type1 = &face->type1;
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if (face)
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{
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memory = face->root.memory;
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/* release font info strings */
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{
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T1_FontInfo* info = &type1->font_info;
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FREE( info->version );
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FREE( info->notice );
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FREE( info->full_name );
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FREE( info->family_name );
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FREE( info->weight );
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}
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/* release top dictionary */
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FREE( type1->charstrings_len );
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FREE( type1->charstrings );
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FREE( type1->glyph_names );
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FREE( type1->subrs );
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FREE( type1->subrs_len );
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FREE( type1->subrs_block );
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FREE( type1->charstrings_block );
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FREE( type1->glyph_names_block );
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FREE( type1->encoding.char_index );
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FREE( type1->font_name );
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#ifndef T1_CONFIG_OPTION_NO_AFM
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/* release afm data if present */
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if ( face->afm_data)
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T1_Done_AFM( memory, (T1_AFM*)face->afm_data );
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#endif
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/* release unicode map, if any */
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FREE( face->unicode_map.maps );
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face->unicode_map.num_maps = 0;
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face->root.family_name = 0;
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face->root.style_name = 0;
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}
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}
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/*******************************************************************
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*
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* <Function> T1_Init_Face
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*
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* <Description>
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* The face object constructor.
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*
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* <Input>
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* face :: face record to build
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* Input :: input stream where to load font data
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*
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* <Return>
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* Error code.
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*
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******************************************************************/
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LOCAL_FUNC
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FT_Error T1_Init_Face( FT_Stream stream,
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T1_Face face,
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FT_Int face_index,
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FT_Int num_params,
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FT_Parameter* params )
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{
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T1_Tokenizer tokenizer;
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FT_Error error;
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PSNames_Interface* psnames;
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UNUSED(num_params);
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UNUSED(params);
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UNUSED(face_index);
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UNUSED(face);
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face->root.num_faces = 1;
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psnames = (PSNames_Interface*)face->psnames;
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if (!psnames)
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{
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psnames = (PSNames_Interface*)
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FT_Get_Module_Interface( FT_FACE_LIBRARY(face), "psnames" );
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}
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face->psnames = psnames;
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/* open the tokenizer, this will also check the font format */
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error = New_Tokenizer( stream, &tokenizer );
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if (error) goto Fail;
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/* if we just wanted to check the format, leave successfully now */
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if (face_index < 0)
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goto Leave;
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/* check the face index */
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if ( face_index != 0 )
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{
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FT_ERROR(( "T1.Init_Face : invalid face index\n" ));
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error = T1_Err_Invalid_Argument;
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goto Leave;
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}
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/* Now, load the font program into the face object */
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{
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T1_Parser parser;
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Init_T1_Parser( &parser, face, tokenizer );
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error = Parse_T1_FontProgram( &parser );
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if (error) goto Leave;
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/* Init the face object fields */
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/* Now set up root face fields */
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{
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FT_Face root = (FT_Face)&face->root;
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T1_Font* type1 = &face->type1;
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root->num_glyphs = type1->num_glyphs;
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root->num_charmaps = 1;
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root->face_index = face_index;
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root->face_flags = FT_FACE_FLAG_SCALABLE;
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root->face_flags |= FT_FACE_FLAG_HORIZONTAL;
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if ( type1->font_info.is_fixed_pitch )
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root->face_flags |= FT_FACE_FLAG_FIXED_WIDTH;
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/* XXX : TO DO - add kerning with .afm support */
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/* get style name - be careful, some broken fonts only */
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/* have a /FontName dictionary entry .. !! */
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root->family_name = type1->font_info.family_name;
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if (root->family_name)
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{
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char* full = type1->font_info.full_name;
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char* family = root->family_name;
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while ( *family && *full == *family )
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{
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family++;
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full++;
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}
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root->style_name = ( *full == ' ' ? full+1 : "Regular" );
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}
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else
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{
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/* do we have a /FontName ?? */
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if (type1->font_name)
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{
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root->family_name = type1->font_name;
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root->style_name = "Regular";
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}
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}
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/* no embedded bitmap support */
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root->num_fixed_sizes = 0;
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root->available_sizes = 0;
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root->bbox = type1->font_bbox;
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root->units_per_EM = 1000;
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root->ascender = (FT_Short)type1->font_bbox.yMax;
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root->descender = -(FT_Short)type1->font_bbox.yMin;
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root->height = ((root->ascender + root->descender)*12)/10;
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/* now compute the maximum advance width */
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root->max_advance_width = type1->private_dict.standard_width[0];
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/* compute max advance width for proportional fonts */
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if (!type1->font_info.is_fixed_pitch)
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{
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FT_Int max_advance;
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error = T1_Compute_Max_Advance( face, &max_advance );
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/* in case of error, keep the standard width */
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if (!error)
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root->max_advance_width = max_advance;
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else
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error = 0; /* clear error */
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}
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root->max_advance_height = root->height;
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root->underline_position = type1->font_info.underline_position;
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root->underline_thickness = type1->font_info.underline_thickness;
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root->max_points = 0;
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root->max_contours = 0;
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}
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}
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/* charmap support - synthetize unicode charmap when possible */
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{
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FT_Face root = &face->root;
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FT_CharMap charmap = face->charmaprecs;
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/* synthesize a Unicode charmap if there is support in the "psnames" */
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/* module.. */
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if (face->psnames)
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{
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PSNames_Interface* psnames = (PSNames_Interface*)face->psnames;
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if (psnames->unicode_value)
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{
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error = psnames->build_unicodes( root->memory,
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face->type1.num_glyphs,
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(const char**)face->type1.glyph_names,
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&face->unicode_map );
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if (!error)
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{
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root->charmap = charmap;
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charmap->face = (FT_Face)face;
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charmap->encoding = ft_encoding_unicode;
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charmap->platform_id = 3;
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charmap->encoding_id = 1;
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charmap++;
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}
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/* simply clear the error in case of failure (which really) */
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/* means that out of memory or no unicode glyph names */
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error = 0;
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}
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}
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/* now, support either the standard, expert, or custom encodings */
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charmap->face = (FT_Face)face;
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charmap->platform_id = 7; /* a new platform id for Adobe fonts ?? */
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switch (face->type1.encoding_type)
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{
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case t1_encoding_standard:
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charmap->encoding = ft_encoding_adobe_standard;
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charmap->encoding_id = 0;
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break;
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case t1_encoding_expert:
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charmap->encoding = ft_encoding_adobe_expert;
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charmap->encoding_id = 1;
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break;
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default:
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charmap->encoding = ft_encoding_adobe_custom;
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charmap->encoding_id = 2;
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break;
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}
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root->charmaps = face->charmaps;
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root->num_charmaps = charmap - face->charmaprecs + 1;
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face->charmaps[0] = &face->charmaprecs[0];
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face->charmaps[1] = &face->charmaprecs[1];
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}
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Leave:
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Done_Tokenizer( tokenizer );
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Fail:
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return error;
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}
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/*******************************************************************
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*
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* Function : Glyph_Destroy
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*
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* Description : The glyph object destructor.
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*
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* Input : _glyph typeless pointer to the glyph record to destroy
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*
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* Output : Error code.
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*
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******************************************************************/
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LOCAL_FUNC
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void T1_Done_GlyphSlot( T1_GlyphSlot glyph )
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{
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#ifndef T1_CONFIG_OPTION_DISABLE_HINTER
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T1_Done_Glyph_Hinter( glyph );
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#else
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UNUSED(glyph)
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#endif
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}
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/*******************************************************************
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*
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* Function : Glyph_Create
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*
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* Description : The glyph object constructor.
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*
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* Input : glyph glyph record to build.
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* face the glyph's parent face.
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*
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* Output : Error code.
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*
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******************************************************************/
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LOCAL_FUNC
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FT_Error T1_Init_GlyphSlot( T1_GlyphSlot glyph )
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{
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FT_Error error = FT_Err_Ok;
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#ifndef T1_CONFIG_OPTION_DISABLE_HINTER
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error = T1_New_Glyph_Hinter( glyph );
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#else
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UNUSED(glyph);
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#endif
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return error;
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}
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/* END */
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