diff options
Diffstat (limited to 'Build/source/libs/freetype2/freetype-src/src/truetype/ttgload.c')
-rw-r--r-- | Build/source/libs/freetype2/freetype-src/src/truetype/ttgload.c | 432 |
1 files changed, 229 insertions, 203 deletions
diff --git a/Build/source/libs/freetype2/freetype-src/src/truetype/ttgload.c b/Build/source/libs/freetype2/freetype-src/src/truetype/ttgload.c index 39d9c3f7362..cbee27aa692 100644 --- a/Build/source/libs/freetype2/freetype-src/src/truetype/ttgload.c +++ b/Build/source/libs/freetype2/freetype-src/src/truetype/ttgload.c @@ -1,19 +1,19 @@ -/***************************************************************************/ -/* */ -/* ttgload.c */ -/* */ -/* TrueType Glyph Loader (body). */ -/* */ -/* Copyright 1996-2018 by */ -/* David Turner, Robert Wilhelm, and Werner Lemberg. */ -/* */ -/* This file is part of the FreeType project, and may only be used, */ -/* modified, and distributed under the terms of the FreeType project */ -/* license, LICENSE.TXT. By continuing to use, modify, or distribute */ -/* this file you indicate that you have read the license and */ -/* understand and accept it fully. */ -/* */ -/***************************************************************************/ +/**************************************************************************** + * + * ttgload.c + * + * TrueType Glyph Loader (body). + * + * Copyright (C) 1996-2019 by + * David Turner, Robert Wilhelm, and Werner Lemberg. + * + * This file is part of the FreeType project, and may only be used, + * modified, and distributed under the terms of the FreeType project + * license, LICENSE.TXT. By continuing to use, modify, or distribute + * this file you indicate that you have read the license and + * understand and accept it fully. + * + */ #include <ft2build.h> @@ -38,20 +38,35 @@ #include "ttsubpix.h" - /*************************************************************************/ - /* */ - /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ - /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ - /* messages during execution. */ - /* */ + /************************************************************************** + * + * The macro FT_COMPONENT is used in trace mode. It is an implicit + * parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log + * messages during execution. + */ #undef FT_COMPONENT -#define FT_COMPONENT trace_ttgload +#define FT_COMPONENT ttgload - /*************************************************************************/ - /* */ - /* Composite glyph flags. */ - /* */ + /************************************************************************** + * + * Simple glyph flags. + */ +#define ON_CURVE_POINT 0x01 /* same value as FT_CURVE_TAG_ON */ +#define X_SHORT_VECTOR 0x02 +#define Y_SHORT_VECTOR 0x04 +#define REPEAT_FLAG 0x08 +#define X_POSITIVE 0x10 /* two meanings depending on X_SHORT_VECTOR */ +#define SAME_X 0x10 +#define Y_POSITIVE 0x20 /* two meanings depending on Y_SHORT_VECTOR */ +#define SAME_Y 0x20 +#define OVERLAP_SIMPLE 0x40 /* we ignore this value */ + + + /************************************************************************** + * + * Composite glyph flags. + */ #define ARGS_ARE_WORDS 0x0001 #define ARGS_ARE_XY_VALUES 0x0002 #define ROUND_XY_TO_GRID 0x0004 @@ -62,15 +77,15 @@ #define WE_HAVE_A_2X2 0x0080 #define WE_HAVE_INSTR 0x0100 #define USE_MY_METRICS 0x0200 -#define OVERLAP_COMPOUND 0x0400 +#define OVERLAP_COMPOUND 0x0400 /* we ignore this value */ #define SCALED_COMPONENT_OFFSET 0x0800 #define UNSCALED_COMPONENT_OFFSET 0x1000 - /*************************************************************************/ - /* */ - /* Return the horizontal metrics in font units for a given glyph. */ - /* */ + /************************************************************************** + * + * Return the horizontal metrics in font units for a given glyph. + */ FT_LOCAL_DEF( void ) TT_Get_HMetrics( TT_Face face, FT_UInt idx, @@ -84,11 +99,11 @@ } - /*************************************************************************/ - /* */ - /* Return the vertical metrics in font units for a given glyph. */ - /* See function `tt_loader_set_pp' below for explanations. */ - /* */ + /************************************************************************** + * + * Return the vertical metrics in font units for a given glyph. + * See function `tt_loader_set_pp' below for explanations. + */ FT_LOCAL_DEF( void ) TT_Get_VMetrics( TT_Face face, FT_UInt idx, @@ -250,13 +265,13 @@ #endif /* FT_CONFIG_OPTION_INCREMENTAL */ - /*************************************************************************/ - /* */ - /* The following functions are used by default with TrueType fonts. */ - /* However, they can be replaced by alternatives if we need to support */ - /* TrueType-compressed formats (like MicroType) in the future. */ - /* */ - /*************************************************************************/ + /************************************************************************** + * + * The following functions are used by default with TrueType fonts. + * However, they can be replaced by alternatives if we need to support + * TrueType-compressed formats (like MicroType) in the future. + * + */ FT_CALLBACK_DEF( FT_Error ) TT_Access_Glyph_Frame( TT_Loader loader, @@ -267,12 +282,9 @@ FT_Error error; FT_Stream stream = loader->stream; - /* for non-debug mode */ FT_UNUSED( glyph_index ); - FT_TRACE4(( "Glyph %ld\n", glyph_index )); - /* the following line sets the `error' variable through macros! */ if ( FT_STREAM_SEEK( offset ) || FT_FRAME_ENTER( byte_count ) ) return error; @@ -337,7 +349,7 @@ FT_Byte *flag, *flag_limit; FT_Byte c, count; FT_Vector *vec, *vec_limit; - FT_Pos x; + FT_Pos x, y; FT_Short *cont, *cont_limit, prev_cont; FT_Int xy_size = 0; @@ -382,6 +394,8 @@ goto Invalid_Outline; } + FT_TRACE5(( " # of points: %d\n", n_points )); + /* note that we will add four phantom points later */ error = FT_GLYPHLOADER_CHECK_POINTS( gloader, n_points + 4, 0 ); if ( error ) @@ -452,7 +466,7 @@ goto Invalid_Outline; *flag++ = c = FT_NEXT_BYTE( p ); - if ( c & 8 ) + if ( c & REPEAT_FLAG ) { if ( p + 1 > limit ) goto Invalid_Outline; @@ -478,31 +492,29 @@ for ( ; vec < vec_limit; vec++, flag++ ) { - FT_Pos y = 0; - FT_Byte f = *flag; + FT_Pos delta = 0; + FT_Byte f = *flag; - if ( f & 2 ) + if ( f & X_SHORT_VECTOR ) { if ( p + 1 > limit ) goto Invalid_Outline; - y = (FT_Pos)FT_NEXT_BYTE( p ); - if ( ( f & 16 ) == 0 ) - y = -y; + delta = (FT_Pos)FT_NEXT_BYTE( p ); + if ( !( f & X_POSITIVE ) ) + delta = -delta; } - else if ( ( f & 16 ) == 0 ) + else if ( !( f & SAME_X ) ) { if ( p + 2 > limit ) goto Invalid_Outline; - y = (FT_Pos)FT_NEXT_SHORT( p ); + delta = (FT_Pos)FT_NEXT_SHORT( p ); } - x += y; + x += delta; vec->x = x; - /* the cast is for stupid compilers */ - *flag = (FT_Byte)( f & ~( 2 | 16 ) ); } /* reading the Y coordinates */ @@ -510,35 +522,36 @@ vec = gloader->current.outline.points; vec_limit = vec + n_points; flag = (FT_Byte*)outline->tags; - x = 0; + y = 0; for ( ; vec < vec_limit; vec++, flag++ ) { - FT_Pos y = 0; - FT_Byte f = *flag; + FT_Pos delta = 0; + FT_Byte f = *flag; - if ( f & 4 ) + if ( f & Y_SHORT_VECTOR ) { if ( p + 1 > limit ) goto Invalid_Outline; - y = (FT_Pos)FT_NEXT_BYTE( p ); - if ( ( f & 32 ) == 0 ) - y = -y; + delta = (FT_Pos)FT_NEXT_BYTE( p ); + if ( !( f & Y_POSITIVE ) ) + delta = -delta; } - else if ( ( f & 32 ) == 0 ) + else if ( !( f & SAME_Y ) ) { if ( p + 2 > limit ) goto Invalid_Outline; - y = (FT_Pos)FT_NEXT_SHORT( p ); + delta = (FT_Pos)FT_NEXT_SHORT( p ); } - x += y; - vec->y = x; + y += delta; + vec->y = y; + /* the cast is for stupid compilers */ - *flag = (FT_Byte)( f & FT_CURVE_TAG_ON ); + *flag = (FT_Byte)( f & ON_CURVE_POINT ); } outline->n_points = (FT_Short)n_points; @@ -559,9 +572,10 @@ TT_Load_Composite_Glyph( TT_Loader loader ) { FT_Error error; - FT_Byte* p = loader->cursor; - FT_Byte* limit = loader->limit; - FT_GlyphLoader gloader = loader->gloader; + FT_Byte* p = loader->cursor; + FT_Byte* limit = loader->limit; + FT_GlyphLoader gloader = loader->gloader; + FT_Long num_glyphs = loader->face->root.num_glyphs; FT_SubGlyph subglyph; FT_UInt num_subglyphs; @@ -590,6 +604,11 @@ subglyph->flags = FT_NEXT_USHORT( p ); subglyph->index = FT_NEXT_USHORT( p ); + /* we reject composites that have components */ + /* with invalid glyph indices */ + if ( subglyph->index >= num_glyphs ) + goto Invalid_Composite; + /* check space */ count = 2; if ( subglyph->flags & ARGS_ARE_WORDS ) @@ -768,15 +787,15 @@ } - /*************************************************************************/ - /* */ - /* <Function> */ - /* TT_Hint_Glyph */ - /* */ - /* <Description> */ - /* Hint the glyph using the zone prepared by the caller. Note that */ - /* the zone is supposed to include four phantom points. */ - /* */ + /************************************************************************** + * + * @Function: + * TT_Hint_Glyph + * + * @Description: + * Hint the glyph using the zone prepared by the caller. Note that + * the zone is supposed to include four phantom points. + */ static FT_Error TT_Hint_Glyph( TT_Loader loader, FT_Bool is_composite ) @@ -797,15 +816,9 @@ #ifdef TT_USE_BYTECODE_INTERPRETER - if ( loader->glyph->control_len > 0xFFFFL ) - { - FT_TRACE1(( "TT_Hint_Glyph: too long instructions" )); - FT_TRACE1(( " (0x%lx byte) is truncated\n", - loader->glyph->control_len )); - } n_ins = loader->glyph->control_len; - /* save original point position in org */ + /* save original point positions in `org' array */ if ( n_ins > 0 ) FT_ARRAY_COPY( zone->org, zone->cur, zone->n_points ); @@ -896,16 +909,16 @@ } - /*************************************************************************/ - /* */ - /* <Function> */ - /* TT_Process_Simple_Glyph */ - /* */ - /* <Description> */ - /* Once a simple glyph has been loaded, it needs to be processed. */ - /* Usually, this means scaling and hinting through bytecode */ - /* interpretation. */ - /* */ + /************************************************************************** + * + * @Function: + * TT_Process_Simple_Glyph + * + * @Description: + * Once a simple glyph has been loaded, it needs to be processed. + * Usually, this means scaling and hinting through bytecode + * interpretation. + */ static FT_Error TT_Process_Simple_Glyph( TT_Loader loader ) { @@ -1071,15 +1084,15 @@ } - /*************************************************************************/ - /* */ - /* <Function> */ - /* TT_Process_Composite_Component */ - /* */ - /* <Description> */ - /* Once a composite component has been loaded, it needs to be */ - /* processed. Usually, this means transforming and translating. */ - /* */ + /************************************************************************** + * + * @Function: + * TT_Process_Composite_Component + * + * @Description: + * Once a composite component has been loaded, it needs to be + * processed. Usually, this means transforming and translating. + */ static FT_Error TT_Process_Composite_Component( TT_Loader loader, FT_SubGlyph subglyph, @@ -1153,10 +1166,10 @@ #if 0 - /*******************************************************************/ - /* */ - /* This algorithm is what Apple documents. But it doesn't work. */ - /* */ + /******************************************************************** + * + * This algorithm is what Apple documents. But it doesn't work. + */ int a = subglyph->transform.xx > 0 ? subglyph->transform.xx : -subglyph->transform.xx; int b = subglyph->transform.yx > 0 ? subglyph->transform.yx @@ -1178,10 +1191,10 @@ #else /* 1 */ - /*******************************************************************/ - /* */ - /* This algorithm is a guess and works much better than the above. */ - /* */ + /******************************************************************** + * + * This algorithm is a guess and works much better than the above. + */ FT_Fixed mac_xscale = FT_Hypot( subglyph->transform.xx, subglyph->transform.xy ); FT_Fixed mac_yscale = FT_Hypot( subglyph->transform.yy, @@ -1239,16 +1252,16 @@ } - /*************************************************************************/ - /* */ - /* <Function> */ - /* TT_Process_Composite_Glyph */ - /* */ - /* <Description> */ - /* This is slightly different from TT_Process_Simple_Glyph, in that */ - /* its sole purpose is to hint the glyph. Thus this function is */ - /* only available when bytecode interpreter is enabled. */ - /* */ + /************************************************************************** + * + * @Function: + * TT_Process_Composite_Glyph + * + * @Description: + * This is slightly different from TT_Process_Simple_Glyph, in that + * its sole purpose is to hint the glyph. Thus this function is + * only available when bytecode interpreter is enabled. + */ static FT_Error TT_Process_Composite_Glyph( TT_Loader loader, FT_UInt start_point, @@ -1460,7 +1473,7 @@ } #endif - use_aw_2 = (FT_Bool)( subpixel_hinting && grayscale ); + use_aw_2 = FT_BOOL( subpixel_hinting && grayscale ); loader->pp1.x = loader->bbox.xMin - loader->left_bearing; loader->pp1.y = 0; @@ -1497,27 +1510,28 @@ } - /*************************************************************************/ - /* */ - /* <Function> */ - /* load_truetype_glyph */ - /* */ - /* <Description> */ - /* Loads a given truetype glyph. Handles composites and uses a */ - /* TT_Loader object. */ - /* */ + /************************************************************************** + * + * @Function: + * load_truetype_glyph + * + * @Description: + * Loads a given truetype glyph. Handles composites and uses a + * TT_Loader object. + */ static FT_Error load_truetype_glyph( TT_Loader loader, FT_UInt glyph_index, FT_UInt recurse_count, FT_Bool header_only ) { - FT_Error error = FT_Err_Ok; + FT_Error error = FT_Err_Ok; FT_Fixed x_scale, y_scale; FT_ULong offset; - TT_Face face = loader->face; - FT_GlyphLoader gloader = loader->gloader; - FT_Bool opened_frame = 0; + TT_Face face = loader->face; + FT_GlyphLoader gloader = loader->gloader; + + FT_Bool opened_frame = 0; #ifdef FT_CONFIG_OPTION_INCREMENTAL FT_StreamRec inc_stream; @@ -1550,15 +1564,15 @@ loader->glyph_index = glyph_index; - if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) + if ( loader->load_flags & FT_LOAD_NO_SCALE ) { - x_scale = loader->size->metrics->x_scale; - y_scale = loader->size->metrics->y_scale; + x_scale = 0x10000L; + y_scale = 0x10000L; } else { - x_scale = 0x10000L; - y_scale = 0x10000L; + x_scale = loader->size->metrics->x_scale; + y_scale = loader->size->metrics->y_scale; } /* Set `offset' to the start of the glyph relative to the start of */ @@ -1617,38 +1631,36 @@ if ( error ) goto Exit; - opened_frame = 1; - /* read glyph header first */ error = face->read_glyph_header( loader ); - if ( error ) - goto Exit; - /* the metrics must be computed after loading the glyph header */ - /* since we need the glyph's `yMax' value in case the vertical */ - /* metrics must be emulated */ - error = tt_get_metrics( loader, glyph_index ); - if ( error ) - goto Exit; + face->forget_glyph_frame( loader ); - if ( header_only ) + if ( error ) goto Exit; } + /* a space glyph */ if ( loader->byte_len == 0 || loader->n_contours == 0 ) { loader->bbox.xMin = 0; loader->bbox.xMax = 0; loader->bbox.yMin = 0; loader->bbox.yMax = 0; + } - error = tt_get_metrics( loader, glyph_index ); - if ( error ) - goto Exit; + /* the metrics must be computed after loading the glyph header */ + /* since we need the glyph's `yMax' value in case the vertical */ + /* metrics must be emulated */ + error = tt_get_metrics( loader, glyph_index ); + if ( error ) + goto Exit; - if ( header_only ) - goto Exit; + if ( header_only ) + goto Exit; + if ( loader->byte_len == 0 || loader->n_contours == 0 ) + { /* must initialize points before (possibly) overriding */ /* glyph metrics from the incremental interface */ tt_loader_set_pp( loader ); @@ -1704,7 +1716,6 @@ loader->pp4.x = points[3].x; loader->pp4.y = points[3].y; - /* recalculate linear horizontal and vertical advances */ /* if we don't have HVAR and VVAR, respectively */ if ( !( loader->face->variation_support & TT_FACE_FLAG_VAR_HADVANCE ) ) @@ -1745,6 +1756,16 @@ /***********************************************************************/ /***********************************************************************/ + /* we now open a frame again, right after the glyph header */ + /* (which consists of 10 bytes) */ + error = face->access_glyph_frame( loader, glyph_index, + face->glyf_offset + offset + 10, + (FT_UInt)loader->byte_len - 10 ); + if ( error ) + goto Exit; + + opened_frame = 1; + /* if it is a simple glyph, load it */ if ( loader->n_contours > 0 ) @@ -1790,7 +1811,6 @@ * pointers with a width of at least 32 bits. */ - /* clear the nodes filled by sibling chains */ node = ft_list_get_node_at( &loader->composites, recurse_count ); for ( node2 = node; node2; node2 = node2->next ) @@ -2002,7 +2022,7 @@ FT_Int linear_vadvance; - /* Each time we call load_truetype_glyph in this loop, the */ + /* Each time we call `load_truetype_glyph' in this loop, the */ /* value of `gloader.base.subglyphs' can change due to table */ /* reallocations. We thus need to recompute the subglyph */ /* pointer on each iteration. */ @@ -2045,12 +2065,14 @@ if ( num_points == num_base_points ) continue; - /* gloader->base.outline consists of three parts: */ - /* 0 -(1)-> start_point -(2)-> num_base_points -(3)-> n_points. */ - /* */ - /* (1): exists from the beginning */ - /* (2): components that have been loaded so far */ - /* (3): the newly loaded component */ + /* gloader->base.outline consists of three parts: */ + /* */ + /* 0 ----> start_point ----> num_base_points ----> n_points */ + /* (1) (2) (3) */ + /* */ + /* (1) points that exist from the beginning */ + /* (2) component points that have been loaded so far */ + /* (3) points of the newly loaded component */ error = TT_Process_Composite_Component( loader, subglyph, start_point, @@ -2132,7 +2154,7 @@ glyph->metrics.horiBearingX = bbox.xMin; glyph->metrics.horiBearingY = bbox.yMax; - glyph->metrics.horiAdvance = loader->pp2.x - loader->pp1.x; + glyph->metrics.horiAdvance = SUB_LONG(loader->pp2.x, loader->pp1.x); /* Adjust advance width to the value contained in the hdmx table */ /* unless FT_LOAD_COMPUTE_METRICS is set or backward compatibility */ @@ -2276,13 +2298,13 @@ /* XXX: for now, we have no better algorithm for the lsb, but it */ /* should work fine. */ /* */ - glyph->metrics.vertBearingX = glyph->metrics.horiBearingX - - glyph->metrics.horiAdvance / 2; + glyph->metrics.vertBearingX = SUB_LONG( glyph->metrics.horiBearingX, + glyph->metrics.horiAdvance / 2 ); glyph->metrics.vertBearingY = top; glyph->metrics.vertAdvance = advance; } - return 0; + return FT_Err_Ok; } @@ -2656,33 +2678,37 @@ } - /*************************************************************************/ - /* */ - /* <Function> */ - /* TT_Load_Glyph */ - /* */ - /* <Description> */ - /* A function used to load a single glyph within a given glyph slot, */ - /* for a given size. */ - /* */ - /* <Input> */ - /* glyph :: A handle to a target slot object where the glyph */ - /* will be loaded. */ - /* */ - /* size :: A handle to the source face size at which the glyph */ - /* must be scaled/loaded. */ - /* */ - /* glyph_index :: The index of the glyph in the font file. */ - /* */ - /* load_flags :: A flag indicating what to load for this glyph. The */ - /* FT_LOAD_XXX constants can be used to control the */ - /* glyph loading process (e.g., whether the outline */ - /* should be scaled, whether to load bitmaps or not, */ - /* whether to hint the outline, etc). */ - /* */ - /* <Return> */ - /* FreeType error code. 0 means success. */ - /* */ + /************************************************************************** + * + * @Function: + * TT_Load_Glyph + * + * @Description: + * A function used to load a single glyph within a given glyph slot, + * for a given size. + * + * @Input: + * glyph :: + * A handle to a target slot object where the glyph + * will be loaded. + * + * size :: + * A handle to the source face size at which the glyph + * must be scaled/loaded. + * + * glyph_index :: + * The index of the glyph in the font file. + * + * load_flags :: + * A flag indicating what to load for this glyph. The + * FT_LOAD_XXX constants can be used to control the + * glyph loading process (e.g., whether the outline + * should be scaled, whether to load bitmaps or not, + * whether to hint the outline, etc). + * + * @Return: + * FreeType error code. 0 means success. + */ FT_LOCAL_DEF( FT_Error ) TT_Load_Glyph( TT_Size size, TT_GlyphSlot glyph, |