+++ /dev/null
-/***************************************************************************/
-/* */
-/* ttdriver.c */
-/* */
-/* TrueType font driver implementation (body). */
-/* */
-/* Copyright 1996-2001 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. */
-/* */
-/***************************************************************************/
-
-
-#include <ft2build.h>
-#include FT_INTERNAL_DEBUG_H
-#include FT_INTERNAL_STREAM_H
-#include FT_INTERNAL_SFNT_H
-#include FT_TRUETYPE_IDS_H
-
-#include "ttdriver.h"
-#include "ttgload.h"
-
-#include "tterrors.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 trace_ttdriver
-
-
- /*************************************************************************/
- /*************************************************************************/
- /*************************************************************************/
- /**** ****/
- /**** ****/
- /**** F A C E S ****/
- /**** ****/
- /**** ****/
- /*************************************************************************/
- /*************************************************************************/
- /*************************************************************************/
-
-
-#undef PAIR_TAG
-#define PAIR_TAG( left, right ) ( ( (FT_ULong)left << 16 ) | \
- (FT_ULong)right )
-
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* Get_Kerning */
- /* */
- /* <Description> */
- /* A driver method used to return the kerning vector between two */
- /* glyphs of the same face. */
- /* */
- /* <Input> */
- /* face :: A handle to the source face object. */
- /* */
- /* left_glyph :: The index of the left glyph in the kern pair. */
- /* */
- /* right_glyph :: The index of the right glyph in the kern pair. */
- /* */
- /* <Output> */
- /* kerning :: The kerning vector. This is in font units for */
- /* scalable formats, and in pixels for fixed-sizes */
- /* formats. */
- /* */
- /* <Return> */
- /* FreeType error code. 0 means success. */
- /* */
- /* <Note> */
- /* Only horizontal layouts (left-to-right & right-to-left) are */
- /* supported by this function. Other layouts, or more sophisticated */
- /* kernings, are out of scope of this method (the basic driver */
- /* interface is meant to be simple). */
- /* */
- /* They can be implemented by format-specific interfaces. */
- /* */
- static FT_Error
- Get_Kerning( TT_Face face,
- FT_UInt left_glyph,
- FT_UInt right_glyph,
- FT_Vector* kerning )
- {
- TT_Kern_0_Pair* pair;
-
-
- if ( !face )
- return TT_Err_Invalid_Face_Handle;
-
- kerning->x = 0;
- kerning->y = 0;
-
- if ( face->kern_pairs )
- {
- /* there are some kerning pairs in this font file! */
- FT_ULong search_tag = PAIR_TAG( left_glyph, right_glyph );
- FT_Long left, right;
-
-
- left = 0;
- right = face->num_kern_pairs - 1;
-
- while ( left <= right )
- {
- FT_Int middle = left + ( ( right - left ) >> 1 );
- FT_ULong cur_pair;
-
-
- pair = face->kern_pairs + middle;
- cur_pair = PAIR_TAG( pair->left, pair->right );
-
- if ( cur_pair == search_tag )
- goto Found;
-
- if ( cur_pair < search_tag )
- left = middle + 1;
- else
- right = middle - 1;
- }
- }
-
- Exit:
- return TT_Err_Ok;
-
- Found:
- kerning->x = pair->value;
- goto Exit;
- }
-
-
-#undef PAIR_TAG
-
-
- /*************************************************************************/
- /*************************************************************************/
- /*************************************************************************/
- /**** ****/
- /**** ****/
- /**** S I Z E S ****/
- /**** ****/
- /**** ****/
- /*************************************************************************/
- /*************************************************************************/
- /*************************************************************************/
-
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* Set_Char_Sizes */
- /* */
- /* <Description> */
- /* A driver method used to reset a size's character sizes (horizontal */
- /* and vertical) expressed in fractional points. */
- /* */
- /* <Input> */
- /* char_width :: The character width expressed in 26.6 */
- /* fractional points. */
- /* */
- /* char_height :: The character height expressed in 26.6 */
- /* fractional points. */
- /* */
- /* horz_resolution :: The horizontal resolution of the output device. */
- /* */
- /* vert_resolution :: The vertical resolution of the output device. */
- /* */
- /* <InOut> */
- /* size :: A handle to the target size object. */
- /* */
- /* <Return> */
- /* FreeType error code. 0 means success. */
- /* */
- static FT_Error
- Set_Char_Sizes( TT_Size size,
- FT_F26Dot6 char_width,
- FT_F26Dot6 char_height,
- FT_UInt horz_resolution,
- FT_UInt vert_resolution )
- {
- FT_Size_Metrics* metrics = &size->root.metrics;
- TT_Face face = (TT_Face)size->root.face;
- FT_Long dim_x, dim_y;
-
-
- /* This bit flag, when set, indicates that the pixel size must be */
- /* truncated to an integer. Nearly all TrueType fonts have this */
- /* bit set, as hinting won't work really well otherwise. */
- /* */
- /* However, for those rare fonts who do not set it, we override */
- /* the default computations performed by the base layer. I */
- /* really don't know whether this is useful, but hey, that's the */
- /* spec :-) */
- /* */
- if ( ( face->header.Flags & 8 ) == 0 )
- {
- /* Compute pixel sizes in 26.6 units */
- dim_x = ( char_width * horz_resolution ) / 72;
- dim_y = ( char_height * vert_resolution ) / 72;
-
- metrics->x_scale = FT_DivFix( dim_x, face->root.units_per_EM );
- metrics->y_scale = FT_DivFix( dim_y, face->root.units_per_EM );
-
- metrics->x_ppem = (FT_UShort)( dim_x >> 6 );
- metrics->y_ppem = (FT_UShort)( dim_y >> 6 );
- }
-
- size->ttmetrics.valid = FALSE;
-#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
- size->strike_index = 0xFFFF;
-#endif
-
- return TT_Reset_Size( size );
- }
-
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* Set_Pixel_Sizes */
- /* */
- /* <Description> */
- /* A driver method used to reset a size's character sizes (horizontal */
- /* and vertical) expressed in integer pixels. */
- /* */
- /* <Input> */
- /* pixel_width :: The character width expressed in integer pixels. */
- /* */
- /* pixel_height :: The character height expressed in integer pixels. */
- /* */
- /* <InOut> */
- /* size :: A handle to the target size object. */
- /* */
- /* <Return> */
- /* FreeType error code. 0 means success. */
- /* */
- static FT_Error
- Set_Pixel_Sizes( TT_Size size,
- FT_UInt pixel_width,
- FT_UInt pixel_height )
- {
- FT_UNUSED( pixel_width );
- FT_UNUSED( pixel_height );
-
- /* many things have been pre-computed by the base layer */
-
- size->ttmetrics.valid = FALSE;
-#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
- size->strike_index = 0xFFFF;
-#endif
-
- return TT_Reset_Size( size );
- }
-
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* Load_Glyph */
- /* */
- /* <Description> */
- /* A driver method used to load a glyph within a given glyph slot. */
- /* */
- /* <Input> */
- /* slot :: A handle to the target slot object where the glyph */
- /* will be loaded. */
- /* */
- /* size :: A handle to the source face size at which the glyph */
- /* must be scaled, loaded, etc. */
- /* */
- /* glyph_index :: The index of the glyph in the font file. */
- /* */
- /* load_flags :: A flag indicating what to load for this glyph. The */
- /* FTLOAD_??? constants can be used to control the */
- /* glyph loading process (e.g., whether the outline */
- /* should be scaled, whether to load bitmaps or not, */
- /* whether to hint the outline, etc). */
- /* */
- /* <Return> */
- /* FreeType error code. 0 means success. */
- /* */
- static FT_Error
- Load_Glyph( TT_GlyphSlot slot,
- TT_Size size,
- FT_UShort glyph_index,
- FT_UInt load_flags )
- {
- FT_Error error;
-
-
- if ( !slot )
- return TT_Err_Invalid_Slot_Handle;
-
- /* check whether we want a scaled outline or bitmap */
- if ( !size )
- load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING;
-
- if ( load_flags & FT_LOAD_NO_SCALE )
- size = NULL;
-
- /* reset the size object if necessary */
- if ( size )
- {
- /* these two object must have the same parent */
- if ( size->root.face != slot->face )
- return TT_Err_Invalid_Face_Handle;
-
- if ( !size->ttmetrics.valid )
- {
- if ( FT_SET_ERROR( TT_Reset_Size( size ) ) )
- return error;
- }
- }
-
- /* now load the glyph outline if necessary */
- error = TT_Load_Glyph( size, slot, glyph_index, load_flags );
-
- /* force drop-out mode to 2 - irrelevant now */
- /* slot->outline.dropout_mode = 2; */
-
- return error;
- }
-
-
- /*************************************************************************/
- /*************************************************************************/
- /*************************************************************************/
- /**** ****/
- /**** ****/
- /**** C H A R A C T E R M A P P I N G S ****/
- /**** ****/
- /**** ****/
- /*************************************************************************/
- /*************************************************************************/
- /*************************************************************************/
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* Get_Char_Index */
- /* */
- /* <Description> */
- /* Uses a charmap to return a given character code's glyph index. */
- /* */
- /* <Input> */
- /* charmap :: A handle to the source charmap object. */
- /* charcode :: The character code. */
- /* */
- /* <Return> */
- /* Glyph index. 0 means `undefined character code'. */
- /* */
- static FT_UInt
- Get_Char_Index( TT_CharMap charmap,
- FT_Long charcode )
- {
- FT_Error error;
- TT_Face face;
- TT_CMapTable* cmap;
-
-
- cmap = &charmap->cmap;
- face = (TT_Face)charmap->root.face;
-
- /* Load table if needed */
- if ( !cmap->loaded )
- {
- SFNT_Interface* sfnt = (SFNT_Interface*)face->sfnt;
-
-
- error = sfnt->load_charmap( face, cmap, face->root.stream );
- if ( error )
- return 0;
-
- cmap->loaded = TRUE;
- }
-
- if ( cmap->get_index )
- return cmap->get_index( cmap, charcode );
- else
- return 0;
- }
-
-
- /*************************************************************************/
- /*************************************************************************/
- /*************************************************************************/
- /**** ****/
- /**** ****/
- /**** D R I V E R I N T E R F A C E ****/
- /**** ****/
- /**** ****/
- /*************************************************************************/
- /*************************************************************************/
- /*************************************************************************/
-
-
- static FT_Module_Interface
- tt_get_interface( TT_Driver driver,
- const char* interface )
- {
- FT_Module sfntd = FT_Get_Module( driver->root.root.library,
- "sfnt" );
- SFNT_Interface* sfnt;
-
-
- /* only return the default interface from the SFNT module */
- if ( sfntd )
- {
- sfnt = (SFNT_Interface*)( sfntd->clazz->module_interface );
- if ( sfnt )
- return sfnt->get_interface( FT_MODULE( driver ), interface );
- }
-
- return 0;
- }
-
-
- /* The FT_DriverInterface structure is defined in ftdriver.h. */
-
- FT_CALLBACK_TABLE_DEF
- const FT_Driver_Class tt_driver_class =
- {
- {
- ft_module_font_driver |
- ft_module_driver_scalable |
-#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
- ft_module_driver_has_hinter,
-#else
- 0,
-#endif
-
- sizeof ( TT_DriverRec ),
-
- "truetype", /* driver name */
- 0x10000L, /* driver version == 1.0 */
- 0x20000L, /* driver requires FreeType 2.0 or above */
-
- (void*)0, /* driver specific interface */
-
- (FT_Module_Constructor)TT_Init_Driver,
- (FT_Module_Destructor) TT_Done_Driver,
- (FT_Module_Requester) tt_get_interface,
- },
-
- sizeof ( TT_FaceRec ),
- sizeof ( TT_SizeRec ),
- sizeof ( FT_GlyphSlotRec ),
-
-
- (FTDriver_initFace) TT_Init_Face,
- (FTDriver_doneFace) TT_Done_Face,
- (FTDriver_initSize) TT_Init_Size,
- (FTDriver_doneSize) TT_Done_Size,
- (FTDriver_initGlyphSlot)0,
- (FTDriver_doneGlyphSlot)0,
-
- (FTDriver_setCharSizes) Set_Char_Sizes,
- (FTDriver_setPixelSizes)Set_Pixel_Sizes,
- (FTDriver_loadGlyph) Load_Glyph,
- (FTDriver_getCharIndex) Get_Char_Index,
-
- (FTDriver_getKerning) Get_Kerning,
- (FTDriver_attachFile) 0,
- (FTDriver_getAdvances) 0
- };
-
-
-#ifdef FT_CONFIG_OPTION_DYNAMIC_DRIVERS
-
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* getDriverClass */
- /* */
- /* <Description> */
- /* This function is used when compiling the TrueType driver as a */
- /* shared library (`.DLL' or `.so'). It will be used by the */
- /* high-level library of FreeType to retrieve the address of the */
- /* driver's generic interface. */
- /* */
- /* It shouldn't be implemented in a static build, as each driver must */
- /* have the same function as an exported entry point. */
- /* */
- /* <Return> */
- /* The address of the TrueType's driver generic interface. The */
- /* format-specific interface can then be retrieved through the method */
- /* interface->get_format_interface. */
- /* */
- FT_EXPORT_DEF( const FT_Driver_Class* )
- getDriverClass( void )
- {
- return &tt_driver_class;
- }
-
-
-#endif /* CONFIG_OPTION_DYNAMIC_DRIVERS */
-
-
-/* END */
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