758 lines
22 KiB
C
758 lines
22 KiB
C
/***************************************************************************/
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/* */
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/* cf2ft.c */
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/* */
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/* FreeType Glue Component to Adobe's Interpreter (body). */
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/* */
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/* Copyright 2013-2014 Adobe Systems Incorporated. */
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/* */
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/* This software, and all works of authorship, whether in source or */
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/* object code form as indicated by the copyright notice(s) included */
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/* herein (collectively, the "Work") is made available, and may only be */
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/* used, modified, and distributed under the FreeType Project License, */
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/* LICENSE.TXT. Additionally, subject to the terms and conditions of the */
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/* FreeType Project License, each contributor to the Work hereby grants */
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/* to any individual or legal entity exercising permissions granted by */
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/* the FreeType Project License and this section (hereafter, "You" or */
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/* "Your") a perpetual, worldwide, non-exclusive, no-charge, */
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/* royalty-free, irrevocable (except as stated in this section) patent */
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/* license to make, have made, use, offer to sell, sell, import, and */
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/* otherwise transfer the Work, where such license applies only to those */
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/* patent claims licensable by such contributor that are necessarily */
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/* infringed by their contribution(s) alone or by combination of their */
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/* contribution(s) with the Work to which such contribution(s) was */
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/* submitted. If You institute patent litigation against any entity */
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/* (including a cross-claim or counterclaim in a lawsuit) alleging that */
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/* the Work or a contribution incorporated within the Work constitutes */
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/* direct or contributory patent infringement, then any patent licenses */
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/* granted to You under this License for that Work shall terminate as of */
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/* the date such litigation is filed. */
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/* */
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/* By using, modifying, or distributing the Work you indicate that you */
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/* have read and understood the terms and conditions of the */
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/* FreeType Project License as well as those provided in this section, */
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/* and you accept them fully. */
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/* */
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/***************************************************************************/
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#include "cf2ft.h"
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#include FT_INTERNAL_DEBUG_H
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#include "cf2font.h"
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#include "cf2error.h"
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#include FT_SERVICE_CFF_TABLE_LOAD_H
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#define CF2_MAX_SIZE cf2_intToFixed( 2000 ) /* max ppem */
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/*
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* This check should avoid most internal overflow cases. Clients should
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* generally respond to `Glyph_Too_Big' by getting a glyph outline
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* at EM size, scaling it and filling it as a graphics operation.
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*
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*/
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static FT_Error
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cf2_checkTransform( const CF2_Matrix* transform,
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CF2_Int unitsPerEm )
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{
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CF2_Fixed maxScale;
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FT_ASSERT( unitsPerEm > 0 );
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if ( transform->a <= 0 || transform->d <= 0 )
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return FT_THROW( Invalid_Size_Handle );
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FT_ASSERT( transform->b == 0 && transform->c == 0 );
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FT_ASSERT( transform->tx == 0 && transform->ty == 0 );
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if ( unitsPerEm > 0x7FFF )
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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 )
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return FT_THROW( Glyph_Too_Big );
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return FT_Err_Ok;
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}
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static void
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cf2_setGlyphWidth( CF2_Outline outline,
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CF2_Fixed width )
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{
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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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}
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/* Clean up font instance. */
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static void
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cf2_free_instance( void* ptr )
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{
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CF2_Font font = (CF2_Font)ptr;
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if ( font )
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{
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FT_Memory memory = font->memory;
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FT_FREE( font->blend.lastNDV );
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FT_FREE( font->blend.BV );
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}
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}
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/********************************************/
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/* */
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/* functions for handling client outline; */
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/* FreeType uses coordinates in 26.6 format */
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/* */
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/********************************************/
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static void
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cf2_builder_moveTo( CF2_OutlineCallbacks callbacks,
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const CF2_CallbackParams params )
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{
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/* downcast the object pointer */
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CF2_Outline outline = (CF2_Outline)callbacks;
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CFF_Builder* builder;
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(void)params; /* only used in debug mode */
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FT_ASSERT( outline && outline->decoder );
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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 */
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cff_builder_close_contour( builder );
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builder->path_begun = 0;
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}
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static void
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cf2_builder_lineTo( CF2_OutlineCallbacks callbacks,
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const CF2_CallbackParams params )
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{
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FT_Error error;
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/* downcast the object pointer */
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CF2_Outline outline = (CF2_Outline)callbacks;
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CFF_Builder* builder;
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FT_ASSERT( outline && outline->decoder );
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FT_ASSERT( params->op == CF2_PathOpLineTo );
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builder = &outline->decoder->builder;
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if ( !builder->path_begun )
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{
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/* record the move before the line; also check points and set */
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/* `path_begun' */
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error = cff_builder_start_point( builder,
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params->pt0.x,
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params->pt0.y );
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if ( error )
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{
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if ( !*callbacks->error )
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*callbacks->error = error;
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return;
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}
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}
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/* `cff_builder_add_point1' includes a check_points call for one point */
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error = cff_builder_add_point1( builder,
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params->pt1.x,
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params->pt1.y );
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if ( error )
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{
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if ( !*callbacks->error )
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*callbacks->error = error;
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return;
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}
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}
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static void
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cf2_builder_cubeTo( CF2_OutlineCallbacks callbacks,
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const CF2_CallbackParams params )
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{
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FT_Error error;
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/* downcast the object pointer */
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CF2_Outline outline = (CF2_Outline)callbacks;
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CFF_Builder* builder;
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FT_ASSERT( outline && outline->decoder );
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FT_ASSERT( params->op == CF2_PathOpCubeTo );
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builder = &outline->decoder->builder;
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if ( !builder->path_begun )
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{
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/* record the move before the line; also check points and set */
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/* `path_begun' */
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error = cff_builder_start_point( builder,
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params->pt0.x,
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params->pt0.y );
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if ( error )
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{
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if ( !*callbacks->error )
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*callbacks->error = error;
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return;
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}
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}
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/* prepare room for 3 points: 2 off-curve, 1 on-curve */
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error = cff_check_points( builder, 3 );
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if ( error )
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{
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if ( !*callbacks->error )
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*callbacks->error = error;
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return;
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}
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cff_builder_add_point( builder,
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params->pt1.x,
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params->pt1.y, 0 );
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cff_builder_add_point( builder,
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params->pt2.x,
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params->pt2.y, 0 );
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cff_builder_add_point( builder,
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params->pt3.x,
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params->pt3.y, 1 );
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}
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static void
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cf2_outline_init( CF2_Outline outline,
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FT_Memory memory,
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FT_Error* error )
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{
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FT_ZERO( outline );
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outline->root.memory = memory;
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outline->root.error = error;
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outline->root.moveTo = cf2_builder_moveTo;
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outline->root.lineTo = cf2_builder_lineTo;
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outline->root.cubeTo = cf2_builder_cubeTo;
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}
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/* get scaling and hint flag from GlyphSlot */
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static void
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cf2_getScaleAndHintFlag( CFF_Decoder* decoder,
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CF2_Fixed* x_scale,
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CF2_Fixed* y_scale,
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FT_Bool* hinted,
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FT_Bool* scaled )
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{
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FT_ASSERT( decoder && decoder->builder.glyph );
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/* note: FreeType scale includes a factor of 64 */
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*hinted = decoder->builder.glyph->hint;
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*scaled = decoder->builder.glyph->scaled;
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if ( *hinted )
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{
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*x_scale = ADD_INT32( decoder->builder.glyph->x_scale, 32 ) / 64;
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*y_scale = ADD_INT32( decoder->builder.glyph->y_scale, 32 ) / 64;
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}
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else
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{
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/* for unhinted outlines, `cff_slot_load' does the scaling, */
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/* thus render at `unity' scale */
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*x_scale = 0x0400; /* 1/64 as 16.16 */
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*y_scale = 0x0400;
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}
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}
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/* get units per em from `FT_Face' */
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/* TODO: should handle font matrix concatenation? */
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static FT_UShort
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cf2_getUnitsPerEm( CFF_Decoder* decoder )
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{
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FT_ASSERT( decoder && decoder->builder.face );
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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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}
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/* Main entry point: Render one glyph. */
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FT_LOCAL_DEF( FT_Error )
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cf2_decoder_parse_charstrings( CFF_Decoder* decoder,
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FT_Byte* charstring_base,
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FT_ULong charstring_len )
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{
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FT_Memory memory;
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FT_Error error = FT_Err_Ok;
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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 */
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font = (CF2_Font)decoder->cff->cf2_instance.data;
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/* on first glyph, allocate instance structure */
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if ( !decoder->cff->cf2_instance.data )
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{
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decoder->cff->cf2_instance.finalizer =
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(FT_Generic_Finalizer)cf2_free_instance;
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if ( FT_ALLOC( decoder->cff->cf2_instance.data,
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sizeof ( CF2_FontRec ) ) )
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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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font->cffload = (FT_Service_CFFLoad)decoder->cff->cffload;
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/* initialize a client outline, to be shared by each glyph rendered */
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cf2_outline_init( &font->outline, font->memory, &font->error );
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}
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/* save decoder; it is a stack variable and will be different on each */
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/* call */
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font->decoder = decoder;
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font->outline.decoder = decoder;
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{
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/* build parameters for Adobe engine */
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CFF_Builder* builder = &decoder->builder;
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CFF_Driver driver = (CFF_Driver)FT_FACE_DRIVER( builder->face );
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FT_Bool no_stem_darkening_driver =
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driver->no_stem_darkening;
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FT_Char no_stem_darkening_font =
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builder->face->root.internal->no_stem_darkening;
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/* local error */
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FT_Error error2 = FT_Err_Ok;
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CF2_BufferRec buf;
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CF2_Matrix transform;
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CF2_F16Dot16 glyphWidth;
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FT_Bool hinted;
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FT_Bool scaled;
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/* FreeType has already looked up the GID; convert to */
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/* `RegionBuffer', assuming that the input has been validated */
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FT_ASSERT( charstring_base + charstring_len >= charstring_base );
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FT_ZERO( &buf );
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buf.start =
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buf.ptr = charstring_base;
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buf.end = charstring_base + charstring_len;
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FT_ZERO( &transform );
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cf2_getScaleAndHintFlag( decoder,
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&transform.a,
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&transform.d,
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&hinted,
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&scaled );
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/* copy isCFF2 boolean from TT_Face to CF2_Font */
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font->isCFF2 = builder->face->is_cff2;
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font->renderingFlags = 0;
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if ( hinted )
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font->renderingFlags |= CF2_FlagsHinted;
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if ( scaled && ( !no_stem_darkening_font ||
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( no_stem_darkening_font < 0 &&
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!no_stem_darkening_driver ) ) )
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font->renderingFlags |= CF2_FlagsDarkened;
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font->darkenParams[0] = driver->darken_params[0];
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font->darkenParams[1] = driver->darken_params[1];
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font->darkenParams[2] = driver->darken_params[2];
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font->darkenParams[3] = driver->darken_params[3];
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font->darkenParams[4] = driver->darken_params[4];
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font->darkenParams[5] = driver->darken_params[5];
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font->darkenParams[6] = driver->darken_params[6];
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font->darkenParams[7] = driver->darken_params[7];
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/* now get an outline for this glyph; */
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/* also get units per em to validate scale */
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font->unitsPerEm = (CF2_Int)cf2_getUnitsPerEm( decoder );
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if ( scaled )
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{
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error2 = cf2_checkTransform( &transform, font->unitsPerEm );
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if ( error2 )
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return error2;
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}
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error2 = cf2_getGlyphOutline( font, &buf, &transform, &glyphWidth );
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if ( error2 )
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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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}
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}
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/* get pointer to current FreeType subfont (based on current glyphID) */
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FT_LOCAL_DEF( CFF_SubFont )
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cf2_getSubfont( CFF_Decoder* decoder )
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{
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FT_ASSERT( decoder && decoder->current_subfont );
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return decoder->current_subfont;
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}
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/* get pointer to VStore structure */
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FT_LOCAL_DEF( CFF_VStore )
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cf2_getVStore( CFF_Decoder* decoder )
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{
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FT_ASSERT( decoder && decoder->cff );
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return &decoder->cff->vstore;
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}
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/* get maxstack value from CFF2 Top DICT */
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FT_LOCAL_DEF( FT_UInt )
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cf2_getMaxstack( CFF_Decoder* decoder )
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{
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FT_ASSERT( decoder && decoder->cff );
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return decoder->cff->top_font.font_dict.maxstack;
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}
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#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
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/* Get normalized design vector for current render request; */
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/* return pointer and length. */
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/* */
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/* Note: Uses FT_Fixed not CF2_Fixed for the vector. */
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FT_LOCAL_DEF( FT_Error )
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cf2_getNormalizedVector( CFF_Decoder* decoder,
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CF2_UInt *len,
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FT_Fixed* *vec )
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{
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FT_ASSERT( decoder && decoder->builder.face );
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FT_ASSERT( vec && len );
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return cff_get_var_blend( decoder->builder.face, len, NULL, vec, NULL );
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}
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#endif
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/* get `y_ppem' from `CFF_Size' */
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FT_LOCAL_DEF( CF2_Fixed )
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cf2_getPpemY( CFF_Decoder* decoder )
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{
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FT_ASSERT( decoder &&
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decoder->builder.face &&
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decoder->builder.face->root.size );
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/*
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* Note that `y_ppem' can be zero if there wasn't a call to
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* `FT_Set_Char_Size' or something similar. However, this isn't a
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* problem since we come to this place in the code only if
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* FT_LOAD_NO_SCALE is set (the other case gets caught by
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* `cf2_checkTransform'). The ppem value is needed to compute the stem
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* darkening, which is disabled for getting the unscaled outline.
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*
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*/
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return cf2_intToFixed(
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decoder->builder.face->root.size->metrics.y_ppem );
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}
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/* get standard stem widths for the current subfont; */
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/* FreeType stores these as integer font units */
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/* (note: variable names seem swapped) */
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FT_LOCAL_DEF( CF2_Fixed )
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cf2_getStdVW( CFF_Decoder* decoder )
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{
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FT_ASSERT( decoder && decoder->current_subfont );
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return cf2_intToFixed(
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decoder->current_subfont->private_dict.standard_height );
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}
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FT_LOCAL_DEF( CF2_Fixed )
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cf2_getStdHW( CFF_Decoder* decoder )
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{
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FT_ASSERT( decoder && decoder->current_subfont );
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return cf2_intToFixed(
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decoder->current_subfont->private_dict.standard_width );
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}
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/* note: FreeType stores 1000 times the actual value for `BlueScale' */
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FT_LOCAL_DEF( void )
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cf2_getBlueMetrics( CFF_Decoder* decoder,
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CF2_Fixed* blueScale,
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CF2_Fixed* blueShift,
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CF2_Fixed* blueFuzz )
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{
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FT_ASSERT( decoder && decoder->current_subfont );
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*blueScale = FT_DivFix(
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decoder->current_subfont->private_dict.blue_scale,
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cf2_intToFixed( 1000 ) );
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*blueShift = cf2_intToFixed(
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decoder->current_subfont->private_dict.blue_shift );
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*blueFuzz = cf2_intToFixed(
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decoder->current_subfont->private_dict.blue_fuzz );
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}
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/* get blue values counts and arrays; the FreeType parser has validated */
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/* the counts and verified that each is an even number */
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FT_LOCAL_DEF( void )
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cf2_getBlueValues( CFF_Decoder* decoder,
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size_t* count,
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FT_Pos* *data )
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{
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FT_ASSERT( decoder && decoder->current_subfont );
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*count = decoder->current_subfont->private_dict.num_blue_values;
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*data = (FT_Pos*)
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&decoder->current_subfont->private_dict.blue_values;
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}
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FT_LOCAL_DEF( void )
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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 = decoder->get_glyph_callback( 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 );
|
|
|
|
decoder->free_glyph_callback( 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 */
|