ref: a18f5e10024df553b18bc4d1a68f0e642586b20a
dir: /src/cff/cf2ft.c/
/***************************************************************************/ /* */ /* cf2ft.c */ /* */ /* FreeType Glue Component to Adobe's Interpreter (body). */ /* */ /* Copyright 2013-2014 Adobe Systems Incorporated. */ /* */ /* This software, and all works of authorship, whether in source or */ /* object code form as indicated by the copyright notice(s) included */ /* herein (collectively, the "Work") is made available, and may only be */ /* used, modified, and distributed under the FreeType Project License, */ /* LICENSE.TXT. Additionally, subject to the terms and conditions of the */ /* FreeType Project License, each contributor to the Work hereby grants */ /* to any individual or legal entity exercising permissions granted by */ /* the FreeType Project License and this section (hereafter, "You" or */ /* "Your") a perpetual, worldwide, non-exclusive, no-charge, */ /* royalty-free, irrevocable (except as stated in this section) patent */ /* license to make, have made, use, offer to sell, sell, import, and */ /* otherwise transfer the Work, where such license applies only to those */ /* patent claims licensable by such contributor that are necessarily */ /* infringed by their contribution(s) alone or by combination of their */ /* contribution(s) with the Work to which such contribution(s) was */ /* submitted. If You institute patent litigation against any entity */ /* (including a cross-claim or counterclaim in a lawsuit) alleging that */ /* the Work or a contribution incorporated within the Work constitutes */ /* direct or contributory patent infringement, then any patent licenses */ /* granted to You under this License for that Work shall terminate as of */ /* the date such litigation is filed. */ /* */ /* By using, modifying, or distributing the Work you indicate that you */ /* have read and understood the terms and conditions of the */ /* FreeType Project License as well as those provided in this section, */ /* and you accept them fully. */ /* */ /***************************************************************************/ #include "cf2ft.h" #include FT_INTERNAL_DEBUG_H #include "cf2font.h" #include "cf2error.h" #define CF2_MAX_SIZE cf2_intToFixed( 2000 ) /* max ppem */ /* * This check should avoid most internal overflow cases. Clients should * generally respond to `Glyph_Too_Big' by getting a glyph outline * at EM size, scaling it and filling it as a graphics operation. * */ static FT_Error cf2_checkTransform( const CF2_Matrix* transform, CF2_Int unitsPerEm ) { CF2_Fixed maxScale; FT_ASSERT( unitsPerEm > 0 ); if ( transform->a <= 0 || transform->d <= 0 ) return FT_THROW( Invalid_Size_Handle ); FT_ASSERT( transform->b == 0 && transform->c == 0 ); FT_ASSERT( transform->tx == 0 && transform->ty == 0 ); if ( unitsPerEm > 0x7FFF ) return FT_THROW( Glyph_Too_Big ); maxScale = FT_DivFix( CF2_MAX_SIZE, cf2_intToFixed( unitsPerEm ) ); if ( transform->a > maxScale || transform->d > maxScale ) return FT_THROW( Glyph_Too_Big ); return FT_Err_Ok; } static void cf2_setGlyphWidth( CF2_Outline outline, CF2_Fixed width ) { CFF_Decoder* decoder = outline->decoder; FT_ASSERT( decoder ); decoder->glyph_width = cf2_fixedToInt( width ); } /* Clean up font instance. */ static void cf2_free_instance( void* ptr ) { CF2_Font font = (CF2_Font)ptr; if ( font ) { FT_Memory memory = font->memory; FT_FREE( font->blend.lastNDV ); FT_FREE( font->blend.BV ); } } /********************************************/ /* */ /* functions for handling client outline; */ /* FreeType uses coordinates in 26.6 format */ /* */ /********************************************/ static void cf2_builder_moveTo( CF2_OutlineCallbacks callbacks, const CF2_CallbackParams params ) { /* downcast the object pointer */ CF2_Outline outline = (CF2_Outline)callbacks; CFF_Builder* builder; (void)params; /* only used in debug mode */ FT_ASSERT( outline && outline->decoder ); FT_ASSERT( params->op == CF2_PathOpMoveTo ); builder = &outline->decoder->builder; /* note: two successive moves simply close the contour twice */ cff_builder_close_contour( builder ); builder->path_begun = 0; } static void cf2_builder_lineTo( CF2_OutlineCallbacks callbacks, const CF2_CallbackParams params ) { FT_Error error; /* downcast the object pointer */ CF2_Outline outline = (CF2_Outline)callbacks; CFF_Builder* builder; FT_ASSERT( outline && outline->decoder ); FT_ASSERT( params->op == CF2_PathOpLineTo ); builder = &outline->decoder->builder; if ( !builder->path_begun ) { /* record the move before the line; also check points and set */ /* `path_begun' */ error = cff_builder_start_point( builder, params->pt0.x, params->pt0.y ); if ( error ) { if ( !*callbacks->error ) *callbacks->error = error; return; } } /* `cff_builder_add_point1' includes a check_points call for one point */ error = cff_builder_add_point1( builder, params->pt1.x, params->pt1.y ); if ( error ) { if ( !*callbacks->error ) *callbacks->error = error; return; } } static void cf2_builder_cubeTo( CF2_OutlineCallbacks callbacks, const CF2_CallbackParams params ) { FT_Error error; /* downcast the object pointer */ CF2_Outline outline = (CF2_Outline)callbacks; CFF_Builder* builder; FT_ASSERT( outline && outline->decoder ); FT_ASSERT( params->op == CF2_PathOpCubeTo ); builder = &outline->decoder->builder; if ( !builder->path_begun ) { /* record the move before the line; also check points and set */ /* `path_begun' */ error = cff_builder_start_point( builder, params->pt0.x, params->pt0.y ); if ( error ) { if ( !*callbacks->error ) *callbacks->error = error; return; } } /* prepare room for 3 points: 2 off-curve, 1 on-curve */ error = cff_check_points( builder, 3 ); if ( error ) { if ( !*callbacks->error ) *callbacks->error = error; return; } cff_builder_add_point( builder, params->pt1.x, params->pt1.y, 0 ); cff_builder_add_point( builder, params->pt2.x, params->pt2.y, 0 ); cff_builder_add_point( builder, params->pt3.x, params->pt3.y, 1 ); } static void cf2_outline_init( CF2_Outline outline, FT_Memory memory, FT_Error* error ) { FT_ZERO( outline ); outline->root.memory = memory; outline->root.error = error; outline->root.moveTo = cf2_builder_moveTo; outline->root.lineTo = cf2_builder_lineTo; outline->root.cubeTo = cf2_builder_cubeTo; } /* get scaling and hint flag from GlyphSlot */ static void cf2_getScaleAndHintFlag( CFF_Decoder* decoder, CF2_Fixed* x_scale, CF2_Fixed* y_scale, FT_Bool* hinted, FT_Bool* scaled ) { FT_ASSERT( decoder && decoder->builder.glyph ); /* note: FreeType scale includes a factor of 64 */ *hinted = decoder->builder.glyph->hint; *scaled = decoder->builder.glyph->scaled; if ( *hinted ) { *x_scale = ( decoder->builder.glyph->x_scale + 32 ) / 64; *y_scale = ( decoder->builder.glyph->y_scale + 32 ) / 64; } else { /* for unhinted outlines, `cff_slot_load' does the scaling, */ /* thus render at `unity' scale */ *x_scale = 0x0400; /* 1/64 as 16.16 */ *y_scale = 0x0400; } } /* get units per em from `FT_Face' */ /* TODO: should handle font matrix concatenation? */ static FT_UShort cf2_getUnitsPerEm( CFF_Decoder* decoder ) { FT_ASSERT( decoder && decoder->builder.face ); FT_ASSERT( decoder->builder.face->root.units_per_EM ); return decoder->builder.face->root.units_per_EM; } /* Main entry point: Render one glyph. */ FT_LOCAL_DEF( FT_Error ) cf2_decoder_parse_charstrings( CFF_Decoder* decoder, FT_Byte* charstring_base, FT_ULong charstring_len ) { FT_Memory memory; FT_Error error = FT_Err_Ok; CF2_Font font; FT_ASSERT( decoder && decoder->cff ); memory = decoder->builder.memory; /* CF2 data is saved here across glyphs */ font = (CF2_Font)decoder->cff->cf2_instance.data; /* on first glyph, allocate instance structure */ if ( !decoder->cff->cf2_instance.data ) { decoder->cff->cf2_instance.finalizer = (FT_Generic_Finalizer)cf2_free_instance; if ( FT_ALLOC( decoder->cff->cf2_instance.data, sizeof ( CF2_FontRec ) ) ) return FT_THROW( Out_Of_Memory ); font = (CF2_Font)decoder->cff->cf2_instance.data; font->memory = memory; /* initialize a client outline, to be shared by each glyph rendered */ cf2_outline_init( &font->outline, font->memory, &font->error ); } /* save decoder; it is a stack variable and will be different on each */ /* call */ font->decoder = decoder; font->outline.decoder = decoder; { /* build parameters for Adobe engine */ CFF_Builder* builder = &decoder->builder; CFF_Driver driver = (CFF_Driver)FT_FACE_DRIVER( builder->face ); /* local error */ FT_Error error2 = FT_Err_Ok; CF2_BufferRec buf; CF2_Matrix transform; CF2_F16Dot16 glyphWidth; FT_Bool hinted; FT_Bool scaled; /* FreeType has already looked up the GID; convert to */ /* `RegionBuffer', assuming that the input has been validated */ FT_ASSERT( charstring_base + charstring_len >= charstring_base ); FT_ZERO( &buf ); buf.start = buf.ptr = charstring_base; buf.end = charstring_base + charstring_len; FT_ZERO( &transform ); cf2_getScaleAndHintFlag( decoder, &transform.a, &transform.d, &hinted, &scaled ); /* copy isCFF2 boolean from TT_Face to CF2_Font */ font->isCFF2 = builder->face->isCFF2; font->renderingFlags = 0; if ( hinted ) font->renderingFlags |= CF2_FlagsHinted; if ( scaled && !driver->no_stem_darkening ) font->renderingFlags |= CF2_FlagsDarkened; font->darkenParams[0] = driver->darken_params[0]; font->darkenParams[1] = driver->darken_params[1]; font->darkenParams[2] = driver->darken_params[2]; font->darkenParams[3] = driver->darken_params[3]; font->darkenParams[4] = driver->darken_params[4]; font->darkenParams[5] = driver->darken_params[5]; font->darkenParams[6] = driver->darken_params[6]; font->darkenParams[7] = driver->darken_params[7]; /* now get an outline for this glyph; */ /* also get units per em to validate scale */ font->unitsPerEm = (CF2_Int)cf2_getUnitsPerEm( decoder ); if ( scaled ) { error2 = cf2_checkTransform( &transform, font->unitsPerEm ); if ( error2 ) return error2; } error2 = cf2_getGlyphOutline( font, &buf, &transform, &glyphWidth ); if ( error2 ) return FT_ERR( Invalid_File_Format ); cf2_setGlyphWidth( &font->outline, glyphWidth ); return FT_Err_Ok; } } /* get pointer to current FreeType subfont (based on current glyphID) */ FT_LOCAL_DEF( CFF_SubFont ) cf2_getSubfont( CFF_Decoder* decoder ) { FT_ASSERT( decoder && decoder->current_subfont ); return decoder->current_subfont; } /* get pointer to VStore structure */ FT_LOCAL_DEF( CFF_VStore ) cf2_getVStore( CFF_Decoder* decoder ) { FT_ASSERT( decoder && decoder->cff ); return &decoder->cff->vstore; } /* get maxstack value from CFF2 Top DICT */ FT_LOCAL_DEF( FT_UInt ) cf2_getMaxstack( CFF_Decoder* decoder ) { FT_ASSERT( decoder && decoder->cff ); return decoder->cff->top_font.font_dict.maxstack; } #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT /* Get normalized design vector for current render request; */ /* return pointer and length. */ /* */ /* Note: Uses FT_Fixed not CF2_Fixed for the vector. */ FT_LOCAL_DEF( FT_Error ) cf2_getNormalizedVector( CFF_Decoder* decoder, CF2_UInt *len, FT_Fixed* *vec ) { FT_ASSERT( decoder && decoder->builder.face ); FT_ASSERT( vec && len ); return cff_get_var_blend( decoder->builder.face, len, vec, NULL ); } #endif /* get `y_ppem' from `CFF_Size' */ FT_LOCAL_DEF( CF2_Fixed ) cf2_getPpemY( CFF_Decoder* decoder ) { FT_ASSERT( decoder && decoder->builder.face && decoder->builder.face->root.size ); /* * Note that `y_ppem' can be zero if there wasn't a call to * `FT_Set_Char_Size' or something similar. However, this isn't a * problem since we come to this place in the code only if * FT_LOAD_NO_SCALE is set (the other case gets caught by * `cf2_checkTransform'). The ppem value is needed to compute the stem * darkening, which is disabled for getting the unscaled outline. * */ return cf2_intToFixed( decoder->builder.face->root.size->metrics.y_ppem ); } /* get standard stem widths for the current subfont; */ /* FreeType stores these as integer font units */ /* (note: variable names seem swapped) */ FT_LOCAL_DEF( CF2_Fixed ) cf2_getStdVW( CFF_Decoder* decoder ) { FT_ASSERT( decoder && decoder->current_subfont ); return cf2_intToFixed( decoder->current_subfont->private_dict.standard_height ); } FT_LOCAL_DEF( CF2_Fixed ) cf2_getStdHW( CFF_Decoder* decoder ) { FT_ASSERT( decoder && decoder->current_subfont ); return cf2_intToFixed( decoder->current_subfont->private_dict.standard_width ); } /* note: FreeType stores 1000 times the actual value for `BlueScale' */ FT_LOCAL_DEF( void ) cf2_getBlueMetrics( CFF_Decoder* decoder, CF2_Fixed* blueScale, CF2_Fixed* blueShift, CF2_Fixed* blueFuzz ) { FT_ASSERT( decoder && decoder->current_subfont ); *blueScale = FT_DivFix( decoder->current_subfont->private_dict.blue_scale, cf2_intToFixed( 1000 ) ); *blueShift = cf2_intToFixed( decoder->current_subfont->private_dict.blue_shift ); *blueFuzz = cf2_intToFixed( decoder->current_subfont->private_dict.blue_fuzz ); } /* get blue values counts and arrays; the FreeType parser has validated */ /* the counts and verified that each is an even number */ FT_LOCAL_DEF( void ) cf2_getBlueValues( CFF_Decoder* decoder, size_t* count, FT_Pos* *data ) { FT_ASSERT( decoder && decoder->current_subfont ); *count = decoder->current_subfont->private_dict.num_blue_values; *data = (FT_Pos*) &decoder->current_subfont->private_dict.blue_values; } FT_LOCAL_DEF( void ) cf2_getOtherBlues( CFF_Decoder* decoder, size_t* count, FT_Pos* *data ) { FT_ASSERT( decoder && decoder->current_subfont ); *count = decoder->current_subfont->private_dict.num_other_blues; *data = (FT_Pos*) &decoder->current_subfont->private_dict.other_blues; } FT_LOCAL_DEF( void ) cf2_getFamilyBlues( CFF_Decoder* decoder, size_t* count, FT_Pos* *data ) { FT_ASSERT( decoder && decoder->current_subfont ); *count = decoder->current_subfont->private_dict.num_family_blues; *data = (FT_Pos*) &decoder->current_subfont->private_dict.family_blues; } FT_LOCAL_DEF( void ) cf2_getFamilyOtherBlues( CFF_Decoder* decoder, size_t* count, FT_Pos* *data ) { FT_ASSERT( decoder && decoder->current_subfont ); *count = decoder->current_subfont->private_dict.num_family_other_blues; *data = (FT_Pos*) &decoder->current_subfont->private_dict.family_other_blues; } FT_LOCAL_DEF( CF2_Int ) cf2_getLanguageGroup( CFF_Decoder* decoder ) { FT_ASSERT( decoder && decoder->current_subfont ); return decoder->current_subfont->private_dict.language_group; } /* convert unbiased subroutine index to `CF2_Buffer' and */ /* return 0 on success */ FT_LOCAL_DEF( CF2_Int ) cf2_initGlobalRegionBuffer( CFF_Decoder* decoder, CF2_Int subrNum, CF2_Buffer buf ) { CF2_UInt idx; FT_ASSERT( decoder ); FT_ZERO( buf ); idx = (CF2_UInt)( subrNum + decoder->globals_bias ); if ( idx >= decoder->num_globals ) return TRUE; /* error */ FT_ASSERT( decoder->globals ); buf->start = buf->ptr = decoder->globals[idx]; buf->end = decoder->globals[idx + 1]; return FALSE; /* success */ } /* convert AdobeStandardEncoding code to CF2_Buffer; */ /* used for seac component */ FT_LOCAL_DEF( FT_Error ) cf2_getSeacComponent( CFF_Decoder* decoder, CF2_Int code, CF2_Buffer buf ) { CF2_Int gid; FT_Byte* charstring; FT_ULong len; FT_Error error; FT_ASSERT( decoder ); FT_ZERO( buf ); #ifdef FT_CONFIG_OPTION_INCREMENTAL /* Incremental fonts don't necessarily have valid charsets. */ /* They use the character code, not the glyph index, in this case. */ if ( decoder->builder.face->root.internal->incremental_interface ) gid = code; else #endif /* FT_CONFIG_OPTION_INCREMENTAL */ { gid = cff_lookup_glyph_by_stdcharcode( decoder->cff, code ); if ( gid < 0 ) return FT_THROW( Invalid_Glyph_Format ); } error = cff_get_glyph_data( decoder->builder.face, (CF2_UInt)gid, &charstring, &len ); /* TODO: for now, just pass the FreeType error through */ if ( error ) return error; /* assume input has been validated */ FT_ASSERT( charstring + len >= charstring ); buf->start = charstring; buf->end = charstring + len; buf->ptr = buf->start; return FT_Err_Ok; } FT_LOCAL_DEF( void ) cf2_freeSeacComponent( CFF_Decoder* decoder, CF2_Buffer buf ) { FT_ASSERT( decoder ); cff_free_glyph_data( decoder->builder.face, (FT_Byte**)&buf->start, (FT_ULong)( buf->end - buf->start ) ); } FT_LOCAL_DEF( CF2_Int ) cf2_initLocalRegionBuffer( CFF_Decoder* decoder, CF2_Int subrNum, CF2_Buffer buf ) { CF2_UInt idx; FT_ASSERT( decoder ); FT_ZERO( buf ); idx = (CF2_UInt)( subrNum + decoder->locals_bias ); if ( idx >= decoder->num_locals ) return TRUE; /* error */ FT_ASSERT( decoder->locals ); buf->start = buf->ptr = decoder->locals[idx]; buf->end = decoder->locals[idx + 1]; return FALSE; /* success */ } FT_LOCAL_DEF( CF2_Fixed ) cf2_getDefaultWidthX( CFF_Decoder* decoder ) { FT_ASSERT( decoder && decoder->current_subfont ); return cf2_intToFixed( decoder->current_subfont->private_dict.default_width ); } FT_LOCAL_DEF( CF2_Fixed ) cf2_getNominalWidthX( CFF_Decoder* decoder ) { FT_ASSERT( decoder && decoder->current_subfont ); return cf2_intToFixed( decoder->current_subfont->private_dict.nominal_width ); } FT_LOCAL_DEF( void ) cf2_outline_reset( CF2_Outline outline ) { CFF_Decoder* decoder = outline->decoder; FT_ASSERT( decoder ); outline->root.windingMomentum = 0; FT_GlyphLoader_Rewind( decoder->builder.loader ); } FT_LOCAL_DEF( void ) cf2_outline_close( CF2_Outline outline ) { CFF_Decoder* decoder = outline->decoder; FT_ASSERT( decoder ); cff_builder_close_contour( &decoder->builder ); FT_GlyphLoader_Add( decoder->builder.loader ); } /* END */