| /***************************************************************************/ |
| /* */ |
| /* cf2ft.c */ |
| /* */ |
| /* FreeType Glue Component to Adobe's Interpreter (body). */ |
| /* */ |
| /* Copyright 2013 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 "../../include/freetype/internal/ftdebug.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 ); |
| |
| FT_ASSERT( transform->a > 0 && transform->d > 0 ); |
| 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; |
| |
| |
| (void)memory; |
| } |
| } |
| |
| |
| /********************************************/ |
| /* */ |
| /* 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 ) |
| { |
| /* 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' */ |
| cff_builder_start_point( builder, |
| params->pt0.x, |
| params->pt0.y ); |
| } |
| |
| /* `cff_builder_add_point1' includes a check_points call for one point */ |
| cff_builder_add_point1( builder, |
| params->pt1.x, |
| params->pt1.y ); |
| } |
| |
| |
| static void |
| cf2_builder_cubeTo( CF2_OutlineCallbacks callbacks, |
| const CF2_CallbackParams params ) |
| { |
| /* 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' */ |
| cff_builder_start_point( builder, |
| params->pt0.x, |
| params->pt0.y ); |
| } |
| |
| /* prepare room for 3 points: 2 off-curve, 1 on-curve */ |
| cff_check_points( builder, 3 ); |
| |
| 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_MEM_ZERO( outline, sizeof ( CF2_OutlineRec ) ); |
| |
| 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 = FT_DivFix( decoder->builder.glyph->x_scale, |
| cf2_intToFixed( 64 ) ); |
| *y_scale = FT_DivFix( decoder->builder.glyph->y_scale, |
| cf2_intToFixed( 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 == NULL ) |
| { |
| 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 ); |
| |
| font->renderingFlags = 0; |
| if ( hinted ) |
| font->renderingFlags |= CF2_FlagsHinted; |
| if ( scaled && !driver->no_stem_darkening ) |
| font->renderingFlags |= CF2_FlagsDarkened; |
| |
| /* now get an outline for this glyph; */ |
| /* also get units per em to validate scale */ |
| font->unitsPerEm = (CF2_Int)cf2_getUnitsPerEm( decoder ); |
| |
| 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 `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 ); |
| FT_ASSERT( decoder->builder.face->root.size->metrics.y_ppem ); |
| |
| 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_UInt idx, |
| CF2_Buffer buf ) |
| { |
| FT_ASSERT( decoder && decoder->globals ); |
| |
| FT_ZERO( buf ); |
| |
| idx += decoder->globals_bias; |
| if ( idx >= decoder->num_globals ) |
| return TRUE; /* error */ |
| |
| 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_UInt code, |
| CF2_Buffer buf ) |
| { |
| CF2_Int gid; |
| FT_Byte* charstring; |
| FT_ULong len; |
| FT_Error error; |
| |
| |
| FT_ASSERT( decoder ); |
| |
| FT_ZERO( buf ); |
| |
| 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, |
| 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_UInt idx, |
| CF2_Buffer buf ) |
| { |
| FT_ASSERT( decoder && decoder->locals ); |
| |
| FT_ZERO( buf ); |
| |
| idx += decoder->locals_bias; |
| if ( idx >= decoder->num_locals ) |
| return TRUE; /* error */ |
| |
| 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 */ |