0,0 → 1,639 |
/***************************************************************************/ |
/* */ |
/* 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. */ |
/* */ |
/***************************************************************************/ |
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#include "cf2ft.h" |
#include FT_INTERNAL_DEBUG_H |
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#include "cf2font.h" |
#include "cf2error.h" |
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#define CF2_MAX_SIZE cf2_intToFixed( 2000 ) /* max ppem */ |
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/* |
* 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; |
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FT_ASSERT( unitsPerEm > 0 ); |
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FT_ASSERT( transform->a > 0 && transform->d > 0 ); |
FT_ASSERT( transform->b == 0 && transform->c == 0 ); |
FT_ASSERT( transform->tx == 0 && transform->ty == 0 ); |
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if ( unitsPerEm > 0x7FFF ) |
return FT_THROW( Glyph_Too_Big ); |
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maxScale = FT_DivFix( CF2_MAX_SIZE, cf2_intToFixed( unitsPerEm ) ); |
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if ( transform->a > maxScale || transform->d > maxScale ) |
return FT_THROW( Glyph_Too_Big ); |
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return FT_Err_Ok; |
} |
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static void |
cf2_setGlyphWidth( CF2_Outline outline, |
CF2_Fixed width ) |
{ |
CFF_Decoder* decoder = outline->decoder; |
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FT_ASSERT( decoder ); |
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decoder->glyph_width = cf2_fixedToInt( width ); |
} |
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/* Clean up font instance. */ |
static void |
cf2_free_instance( void* ptr ) |
{ |
CF2_Font font = (CF2_Font)ptr; |
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if ( font ) |
{ |
FT_Memory memory = font->memory; |
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(void)memory; |
} |
} |
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/********************************************/ |
/* */ |
/* functions for handling client outline; */ |
/* FreeType uses coordinates in 26.6 format */ |
/* */ |
/********************************************/ |
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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; |
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(void)params; /* only used in debug mode */ |
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FT_ASSERT( outline && outline->decoder ); |
FT_ASSERT( params->op == CF2_PathOpMoveTo ); |
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builder = &outline->decoder->builder; |
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/* note: two successive moves simply close the contour twice */ |
cff_builder_close_contour( builder ); |
builder->path_begun = 0; |
} |
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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; |
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FT_ASSERT( outline && outline->decoder ); |
FT_ASSERT( params->op == CF2_PathOpLineTo ); |
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builder = &outline->decoder->builder; |
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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 ); |
} |
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/* `cff_builder_add_point1' includes a check_points call for one point */ |
cff_builder_add_point1( builder, |
params->pt1.x, |
params->pt1.y ); |
} |
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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; |
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FT_ASSERT( outline && outline->decoder ); |
FT_ASSERT( params->op == CF2_PathOpCubeTo ); |
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builder = &outline->decoder->builder; |
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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 ); |
} |
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/* prepare room for 3 points: 2 off-curve, 1 on-curve */ |
cff_check_points( builder, 3 ); |
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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 ); |
} |
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static void |
cf2_outline_init( CF2_Outline outline, |
FT_Memory memory, |
FT_Error* error ) |
{ |
FT_MEM_ZERO( outline, sizeof ( CF2_OutlineRec ) ); |
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outline->root.memory = memory; |
outline->root.error = error; |
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outline->root.moveTo = cf2_builder_moveTo; |
outline->root.lineTo = cf2_builder_lineTo; |
outline->root.cubeTo = cf2_builder_cubeTo; |
} |
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/* 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 ); |
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/* note: FreeType scale includes a factor of 64 */ |
*hinted = decoder->builder.glyph->hint; |
*scaled = decoder->builder.glyph->scaled; |
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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 */ |
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*x_scale = 0x0400; /* 1/64 as 16.16 */ |
*y_scale = 0x0400; |
} |
} |
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/* 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 ); |
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return decoder->builder.face->root.units_per_EM; |
} |
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/* 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; |
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FT_ASSERT( decoder && decoder->cff ); |
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memory = decoder->builder.memory; |
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/* CF2 data is saved here across glyphs */ |
font = (CF2_Font)decoder->cff->cf2_instance.data; |
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/* on first glyph, allocate instance structure */ |
if ( decoder->cff->cf2_instance.data == NULL ) |
{ |
decoder->cff->cf2_instance.finalizer = |
(FT_Generic_Finalizer)cf2_free_instance; |
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if ( FT_ALLOC( decoder->cff->cf2_instance.data, |
sizeof ( CF2_FontRec ) ) ) |
return FT_THROW( Out_Of_Memory ); |
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font = (CF2_Font)decoder->cff->cf2_instance.data; |
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font->memory = memory; |
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/* initialize a client outline, to be shared by each glyph rendered */ |
cf2_outline_init( &font->outline, font->memory, &font->error ); |
} |
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/* save decoder; it is a stack variable and will be different on each */ |
/* call */ |
font->decoder = decoder; |
font->outline.decoder = decoder; |
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{ |
/* build parameters for Adobe engine */ |
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CFF_Builder* builder = &decoder->builder; |
CFF_Driver driver = (CFF_Driver)FT_FACE_DRIVER( builder->face ); |
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/* local error */ |
FT_Error error2 = FT_Err_Ok; |
CF2_BufferRec buf; |
CF2_Matrix transform; |
CF2_F16Dot16 glyphWidth; |
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FT_Bool hinted; |
FT_Bool scaled; |
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/* 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 ); |
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FT_ZERO( &buf ); |
buf.start = |
buf.ptr = charstring_base; |
buf.end = charstring_base + charstring_len; |
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FT_ZERO( &transform ); |
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cf2_getScaleAndHintFlag( decoder, |
&transform.a, |
&transform.d, |
&hinted, |
&scaled ); |
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font->renderingFlags = 0; |
if ( hinted ) |
font->renderingFlags |= CF2_FlagsHinted; |
if ( scaled && !driver->no_stem_darkening ) |
font->renderingFlags |= CF2_FlagsDarkened; |
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/* now get an outline for this glyph; */ |
/* also get units per em to validate scale */ |
font->unitsPerEm = (CF2_Int)cf2_getUnitsPerEm( decoder ); |
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error2 = cf2_checkTransform( &transform, font->unitsPerEm ); |
if ( error2 ) |
return error2; |
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error2 = cf2_getGlyphOutline( font, &buf, &transform, &glyphWidth ); |
if ( error2 ) |
return FT_ERR( Invalid_File_Format ); |
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cf2_setGlyphWidth( &font->outline, glyphWidth ); |
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return FT_Err_Ok; |
} |
} |
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/* 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 ); |
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return decoder->current_subfont; |
} |
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/* 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 ); |
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return cf2_intToFixed( |
decoder->builder.face->root.size->metrics.y_ppem ); |
} |
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/* 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 ); |
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return cf2_intToFixed( |
decoder->current_subfont->private_dict.standard_height ); |
} |
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FT_LOCAL_DEF( CF2_Fixed ) |
cf2_getStdHW( CFF_Decoder* decoder ) |
{ |
FT_ASSERT( decoder && decoder->current_subfont ); |
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return cf2_intToFixed( |
decoder->current_subfont->private_dict.standard_width ); |
} |
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/* 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 ); |
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*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 ); |
} |
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/* 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 ); |
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*count = decoder->current_subfont->private_dict.num_blue_values; |
*data = (FT_Pos*) |
&decoder->current_subfont->private_dict.blue_values; |
} |
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FT_LOCAL_DEF( void ) |
cf2_getOtherBlues( CFF_Decoder* decoder, |
size_t* count, |
FT_Pos* *data ) |
{ |
FT_ASSERT( decoder && decoder->current_subfont ); |
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*count = decoder->current_subfont->private_dict.num_other_blues; |
*data = (FT_Pos*) |
&decoder->current_subfont->private_dict.other_blues; |
} |
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FT_LOCAL_DEF( void ) |
cf2_getFamilyBlues( CFF_Decoder* decoder, |
size_t* count, |
FT_Pos* *data ) |
{ |
FT_ASSERT( decoder && decoder->current_subfont ); |
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*count = decoder->current_subfont->private_dict.num_family_blues; |
*data = (FT_Pos*) |
&decoder->current_subfont->private_dict.family_blues; |
} |
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FT_LOCAL_DEF( void ) |
cf2_getFamilyOtherBlues( CFF_Decoder* decoder, |
size_t* count, |
FT_Pos* *data ) |
{ |
FT_ASSERT( decoder && decoder->current_subfont ); |
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*count = decoder->current_subfont->private_dict.num_family_other_blues; |
*data = (FT_Pos*) |
&decoder->current_subfont->private_dict.family_other_blues; |
} |
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FT_LOCAL_DEF( CF2_Int ) |
cf2_getLanguageGroup( CFF_Decoder* decoder ) |
{ |
FT_ASSERT( decoder && decoder->current_subfont ); |
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return decoder->current_subfont->private_dict.language_group; |
} |
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/* 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 ); |
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FT_ZERO( buf ); |
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idx += decoder->globals_bias; |
if ( idx >= decoder->num_globals ) |
return TRUE; /* error */ |
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buf->start = |
buf->ptr = decoder->globals[idx]; |
buf->end = decoder->globals[idx + 1]; |
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return FALSE; /* success */ |
} |
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/* 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; |
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FT_ASSERT( decoder ); |
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FT_ZERO( buf ); |
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gid = cff_lookup_glyph_by_stdcharcode( decoder->cff, code ); |
if ( gid < 0 ) |
return FT_THROW( Invalid_Glyph_Format ); |
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error = cff_get_glyph_data( decoder->builder.face, |
gid, |
&charstring, |
&len ); |
/* TODO: for now, just pass the FreeType error through */ |
if ( error ) |
return error; |
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/* assume input has been validated */ |
FT_ASSERT( charstring + len >= charstring ); |
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buf->start = charstring; |
buf->end = charstring + len; |
buf->ptr = buf->start; |
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return FT_Err_Ok; |
} |
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FT_LOCAL_DEF( void ) |
cf2_freeSeacComponent( CFF_Decoder* decoder, |
CF2_Buffer buf ) |
{ |
FT_ASSERT( decoder ); |
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cff_free_glyph_data( decoder->builder.face, |
(FT_Byte**)&buf->start, |
(FT_ULong)( buf->end - buf->start ) ); |
} |
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FT_LOCAL_DEF( CF2_Int ) |
cf2_initLocalRegionBuffer( CFF_Decoder* decoder, |
CF2_UInt idx, |
CF2_Buffer buf ) |
{ |
FT_ASSERT( decoder && decoder->locals ); |
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FT_ZERO( buf ); |
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idx += decoder->locals_bias; |
if ( idx >= decoder->num_locals ) |
return TRUE; /* error */ |
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buf->start = |
buf->ptr = decoder->locals[idx]; |
buf->end = decoder->locals[idx + 1]; |
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return FALSE; /* success */ |
} |
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FT_LOCAL_DEF( CF2_Fixed ) |
cf2_getDefaultWidthX( CFF_Decoder* decoder ) |
{ |
FT_ASSERT( decoder && decoder->current_subfont ); |
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return cf2_intToFixed( |
decoder->current_subfont->private_dict.default_width ); |
} |
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FT_LOCAL_DEF( CF2_Fixed ) |
cf2_getNominalWidthX( CFF_Decoder* decoder ) |
{ |
FT_ASSERT( decoder && decoder->current_subfont ); |
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return cf2_intToFixed( |
decoder->current_subfont->private_dict.nominal_width ); |
} |
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FT_LOCAL_DEF( void ) |
cf2_outline_reset( CF2_Outline outline ) |
{ |
CFF_Decoder* decoder = outline->decoder; |
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FT_ASSERT( decoder ); |
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outline->root.windingMomentum = 0; |
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FT_GlyphLoader_Rewind( decoder->builder.loader ); |
} |
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FT_LOCAL_DEF( void ) |
cf2_outline_close( CF2_Outline outline ) |
{ |
CFF_Decoder* decoder = outline->decoder; |
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FT_ASSERT( decoder ); |
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cff_builder_close_contour( &decoder->builder ); |
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FT_GlyphLoader_Add( decoder->builder.loader ); |
} |
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/* END */ |