diff options
Diffstat (limited to 'src/3rdparty/freetype/src/sfnt/ttsbit.c')
-rw-r--r-- | src/3rdparty/freetype/src/sfnt/ttsbit.c | 402 |
1 files changed, 306 insertions, 96 deletions
diff --git a/src/3rdparty/freetype/src/sfnt/ttsbit.c b/src/3rdparty/freetype/src/sfnt/ttsbit.c index 3b351ecfce..33b8640bc3 100644 --- a/src/3rdparty/freetype/src/sfnt/ttsbit.c +++ b/src/3rdparty/freetype/src/sfnt/ttsbit.c @@ -4,7 +4,7 @@ /* */ /* TrueType and OpenType embedded bitmap support (body). */ /* */ -/* Copyright 2005-2015 by */ +/* Copyright 2005-2018 by */ /* David Turner, Robert Wilhelm, and Werner Lemberg. */ /* */ /* Copyright 2013 by Google, Inc. */ @@ -24,6 +24,10 @@ #include FT_INTERNAL_STREAM_H #include FT_TRUETYPE_TAGS_H #include FT_BITMAP_H + + +#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS + #include "ttsbit.h" #include "sferrors.h" @@ -48,6 +52,7 @@ { FT_Error error; FT_ULong table_size; + FT_ULong table_start; face->sbit_table = NULL; @@ -83,6 +88,8 @@ goto Exit; } + table_start = FT_STREAM_POS(); + switch ( (FT_UInt)face->sbit_table_type ) { case TT_SBIT_TABLE_TYPE_EBLC: @@ -104,7 +111,12 @@ version = FT_NEXT_LONG( p ); num_strikes = FT_NEXT_ULONG( p ); - if ( ( (FT_ULong)version & 0xFFFF0000UL ) != 0x00020000UL ) + /* there's at least one font (FZShuSong-Z01, version 3) */ + /* that uses the wrong byte order for the `version' field */ + if ( ( (FT_ULong)version & 0xFFFF0000UL ) != 0x00020000UL && + ( (FT_ULong)version & 0x0000FFFFUL ) != 0x00000200UL && + ( (FT_ULong)version & 0xFFFF0000UL ) != 0x00030000UL && + ( (FT_ULong)version & 0x0000FFFFUL ) != 0x00000300UL ) { error = FT_THROW( Unknown_File_Format ); goto Exit; @@ -189,12 +201,51 @@ break; default: + /* we ignore unknown table formats */ error = FT_THROW( Unknown_File_Format ); break; } if ( !error ) - FT_TRACE3(( "sbit_num_strikes: %u\n", face->sbit_num_strikes )); + FT_TRACE3(( "tt_face_load_sbit_strikes: found %u strikes\n", + face->sbit_num_strikes )); + + face->ebdt_start = 0; + face->ebdt_size = 0; + + if ( face->sbit_table_type == TT_SBIT_TABLE_TYPE_SBIX ) + { + /* the `sbix' table is self-contained; */ + /* it has no associated data table */ + face->ebdt_start = table_start; + face->ebdt_size = table_size; + } + else if ( face->sbit_table_type != TT_SBIT_TABLE_TYPE_NONE ) + { + FT_ULong ebdt_size; + + + error = face->goto_table( face, TTAG_CBDT, stream, &ebdt_size ); + if ( error ) + error = face->goto_table( face, TTAG_EBDT, stream, &ebdt_size ); + if ( error ) + error = face->goto_table( face, TTAG_bdat, stream, &ebdt_size ); + + if ( !error ) + { + face->ebdt_start = FT_STREAM_POS(); + face->ebdt_size = ebdt_size; + } + } + + if ( !face->ebdt_size ) + { + FT_TRACE2(( "tt_face_load_sbit_strikes:" + " no embedded bitmap data table found;\n" + " " + " resetting number of strikes to zero\n" )); + face->sbit_num_strikes = 0; + } return FT_Err_Ok; @@ -238,8 +289,22 @@ FT_ULong strike_index, FT_Size_Metrics* metrics ) { - if ( strike_index >= (FT_ULong)face->sbit_num_strikes ) - return FT_THROW( Invalid_Argument ); + /* we have to test for the existence of `sbit_strike_map' */ + /* because the function gets also used at the very beginning */ + /* to construct `sbit_strike_map' itself */ + if ( face->sbit_strike_map ) + { + if ( strike_index >= (FT_ULong)face->root.num_fixed_sizes ) + return FT_THROW( Invalid_Argument ); + + /* map to real index */ + strike_index = face->sbit_strike_map[strike_index]; + } + else + { + if ( strike_index >= (FT_ULong)face->sbit_num_strikes ) + return FT_THROW( Invalid_Argument ); + } switch ( (FT_UInt)face->sbit_table_type ) { @@ -247,6 +312,8 @@ case TT_SBIT_TABLE_TYPE_CBLC: { FT_Byte* strike; + FT_Char max_before_bl; + FT_Char min_after_bl; strike = face->sbit_table + 8 + strike_index * 48; @@ -256,24 +323,91 @@ metrics->ascender = (FT_Char)strike[16] * 64; /* hori.ascender */ metrics->descender = (FT_Char)strike[17] * 64; /* hori.descender */ - metrics->height = metrics->ascender - metrics->descender; + + /* Due to fuzzy wording in the EBLC documentation, we find both */ + /* positive and negative values for `descender'. Additionally, */ + /* many fonts have both `ascender' and `descender' set to zero */ + /* (which is definitely wrong). MS Windows simply ignores all */ + /* those values... For these reasons we apply some heuristics */ + /* to get a reasonable, non-zero value for the height. */ + + max_before_bl = (FT_Char)strike[24]; + min_after_bl = (FT_Char)strike[25]; + + if ( metrics->descender > 0 ) + { + /* compare sign of descender with `min_after_bl' */ + if ( min_after_bl < 0 ) + metrics->descender = -metrics->descender; + } + + else if ( metrics->descender == 0 ) + { + if ( metrics->ascender == 0 ) + { + FT_TRACE2(( "tt_face_load_strike_metrics:" + " sanitizing invalid ascender and descender\n" + " " + " values for strike %d (%dppem, %dppem)\n", + strike_index, + metrics->x_ppem, metrics->y_ppem )); + + /* sanitize buggy ascender and descender values */ + if ( max_before_bl || min_after_bl ) + { + metrics->ascender = max_before_bl * 64; + metrics->descender = min_after_bl * 64; + } + else + { + metrics->ascender = metrics->y_ppem * 64; + metrics->descender = 0; + } + } + } + +#if 0 + else + ; /* if we have a negative descender, simply use it */ +#endif + + metrics->height = metrics->ascender - metrics->descender; + if ( metrics->height == 0 ) + { + FT_TRACE2(( "tt_face_load_strike_metrics:" + " sanitizing invalid height value\n" + " " + " for strike (%d, %d)\n", + metrics->x_ppem, metrics->y_ppem )); + metrics->height = metrics->y_ppem * 64; + metrics->descender = metrics->ascender - metrics->height; + } /* Is this correct? */ metrics->max_advance = ( (FT_Char)strike[22] + /* min_origin_SB */ strike[18] + /* max_width */ (FT_Char)strike[23] /* min_advance_SB */ ) * 64; + + /* set the scale values (in 16.16 units) so advances */ + /* from the hmtx and vmtx table are scaled correctly */ + metrics->x_scale = FT_MulDiv( metrics->x_ppem, + 64 * 0x10000, + face->header.Units_Per_EM ); + metrics->y_scale = FT_MulDiv( metrics->y_ppem, + 64 * 0x10000, + face->header.Units_Per_EM ); + return FT_Err_Ok; } case TT_SBIT_TABLE_TYPE_SBIX: { FT_Stream stream = face->root.stream; - FT_UInt offset, upem; - FT_UShort ppem, resolution; + FT_UInt offset; + FT_UShort upem, ppem, resolution; TT_HoriHeader *hori; - FT_ULong table_size; - FT_Pos ppem_, upem_; /* to reduce casts */ + FT_Pos ppem_; /* to reduce casts */ FT_Error error; FT_Byte* p; @@ -282,15 +416,11 @@ p = face->sbit_table + 8 + 4 * strike_index; offset = FT_NEXT_ULONG( p ); - error = face->goto_table( face, TTAG_sbix, stream, &table_size ); - if ( error ) - return error; - - if ( offset + 4 > table_size ) + if ( offset + 4 > face->ebdt_size ) return FT_THROW( Invalid_File_Format ); - if ( FT_STREAM_SEEK( FT_STREAM_POS() + offset ) || - FT_FRAME_ENTER( 4 ) ) + if ( FT_STREAM_SEEK( face->ebdt_start + offset ) || + FT_FRAME_ENTER( 4 ) ) return error; ppem = FT_GET_USHORT(); @@ -307,14 +437,25 @@ metrics->y_ppem = ppem; ppem_ = (FT_Pos)ppem; - upem_ = (FT_Pos)upem; - metrics->ascender = ppem_ * hori->Ascender * 64 / upem_; - metrics->descender = ppem_ * hori->Descender * 64 / upem_; - metrics->height = ppem_ * ( hori->Ascender - - hori->Descender + - hori->Line_Gap ) * 64 / upem_; - metrics->max_advance = ppem_ * hori->advance_Width_Max * 64 / upem_; + metrics->ascender = + FT_MulDiv( hori->Ascender, ppem_ * 64, upem ); + metrics->descender = + FT_MulDiv( hori->Descender, ppem_ * 64, upem ); + metrics->height = + FT_MulDiv( hori->Ascender - hori->Descender + hori->Line_Gap, + ppem_ * 64, upem ); + metrics->max_advance = + FT_MulDiv( hori->advance_Width_Max, ppem_ * 64, upem ); + + /* set the scale values (in 16.16 units) so advances */ + /* from the hmtx and vmtx table are scaled correctly */ + metrics->x_scale = FT_MulDiv( metrics->x_ppem, + 64 * 0x10000, + face->header.Units_Per_EM ); + metrics->y_scale = FT_MulDiv( metrics->y_ppem, + 64 * 0x10000, + face->header.Units_Per_EM ); return error; } @@ -352,17 +493,15 @@ FT_ULong strike_index, TT_SBit_MetricsRec* metrics ) { - FT_Error error; + FT_Error error = FT_ERR( Table_Missing ); FT_Stream stream = face->root.stream; - FT_ULong ebdt_size; - error = face->goto_table( face, TTAG_CBDT, stream, &ebdt_size ); - if ( error ) - error = face->goto_table( face, TTAG_EBDT, stream, &ebdt_size ); - if ( error ) - error = face->goto_table( face, TTAG_bdat, stream, &ebdt_size ); - if ( error ) + strike_index = face->sbit_strike_map[strike_index]; + + if ( !face->ebdt_size ) + goto Exit; + if ( FT_STREAM_SEEK( face->ebdt_start ) ) goto Exit; decoder->face = face; @@ -373,8 +512,8 @@ decoder->metrics_loaded = 0; decoder->bitmap_allocated = 0; - decoder->ebdt_start = FT_STREAM_POS(); - decoder->ebdt_size = ebdt_size; + decoder->ebdt_start = face->ebdt_start; + decoder->ebdt_size = face->ebdt_size; decoder->eblc_base = face->sbit_table; decoder->eblc_limit = face->sbit_table + face->sbit_table_size; @@ -419,7 +558,8 @@ static FT_Error - tt_sbit_decoder_alloc_bitmap( TT_SBitDecoder decoder ) + tt_sbit_decoder_alloc_bitmap( TT_SBitDecoder decoder, + FT_Bool metrics_only ) { FT_Error error = FT_Err_Ok; FT_UInt width, height; @@ -482,6 +622,9 @@ if ( size == 0 ) goto Exit; /* exit successfully! */ + if ( metrics_only ) + goto Exit; /* only metrics are requested */ + error = ft_glyphslot_alloc_bitmap( decoder->face->root.glyph, size ); if ( error ) goto Exit; @@ -547,13 +690,17 @@ tt_sbit_decoder_load_image( TT_SBitDecoder decoder, FT_UInt glyph_index, FT_Int x_pos, - FT_Int y_pos ); + FT_Int y_pos, + FT_UInt recurse_count, + FT_Bool metrics_only ); - typedef FT_Error (*TT_SBitDecoder_LoadFunc)( TT_SBitDecoder decoder, - FT_Byte* p, - FT_Byte* plimit, - FT_Int x_pos, - FT_Int y_pos ); + typedef FT_Error (*TT_SBitDecoder_LoadFunc)( + TT_SBitDecoder decoder, + FT_Byte* p, + FT_Byte* plimit, + FT_Int x_pos, + FT_Int y_pos, + FT_UInt recurse_count ); static FT_Error @@ -561,7 +708,8 @@ FT_Byte* p, FT_Byte* limit, FT_Int x_pos, - FT_Int y_pos ) + FT_Int y_pos, + FT_UInt recurse_count ) { FT_Error error = FT_Err_Ok; FT_Byte* line; @@ -569,6 +717,8 @@ FT_UInt bit_height, bit_width; FT_Bitmap* bitmap; + FT_UNUSED( recurse_count ); + /* check that we can write the glyph into the bitmap */ bitmap = decoder->bitmap; @@ -700,7 +850,8 @@ FT_Byte* p, FT_Byte* limit, FT_Int x_pos, - FT_Int y_pos ) + FT_Int y_pos, + FT_UInt recurse_count ) { FT_Error error = FT_Err_Ok; FT_Byte* line; @@ -709,6 +860,8 @@ FT_Bitmap* bitmap; FT_UShort rval; + FT_UNUSED( recurse_count ); + /* check that we can write the glyph into the bitmap */ bitmap = decoder->bitmap; @@ -738,6 +891,12 @@ goto Exit; } + if ( !line_bits || !height ) + { + /* nothing to do */ + goto Exit; + } + /* now do the blit */ /* adjust `line' to point to the first byte of the bitmap */ @@ -777,7 +936,7 @@ } *pwrite++ |= ( ( rval >> nbits ) & 0xFF ) & - ( ~( 0xFF << w ) << ( 8 - w - x_pos ) ); + ( ~( 0xFFU << w ) << ( 8 - w - x_pos ) ); rval <<= 8; w = line_bits - w; @@ -824,7 +983,8 @@ FT_Byte* p, FT_Byte* limit, FT_Int x_pos, - FT_Int y_pos ) + FT_Int y_pos, + FT_UInt recurse_count ) { FT_Error error = FT_Err_Ok; FT_UInt num_components, nn; @@ -847,8 +1007,9 @@ goto Fail; } - FT_TRACE3(( "tt_sbit_decoder_load_compound: loading %d components\n", - num_components )); + FT_TRACE3(( "tt_sbit_decoder_load_compound: loading %d component%s\n", + num_components, + num_components == 1 ? "" : "s" )); for ( nn = 0; nn < num_components; nn++ ) { @@ -858,8 +1019,13 @@ /* NB: a recursive call */ - error = tt_sbit_decoder_load_image( decoder, gindex, - x_pos + dx, y_pos + dy ); + error = tt_sbit_decoder_load_image( decoder, + gindex, + x_pos + dx, + y_pos + dy, + recurse_count + 1, + /* request full bitmap image */ + FALSE ); if ( error ) break; } @@ -891,11 +1057,14 @@ FT_Byte* p, FT_Byte* limit, FT_Int x_pos, - FT_Int y_pos ) + FT_Int y_pos, + FT_UInt recurse_count ) { FT_Error error = FT_Err_Ok; FT_ULong png_len; + FT_UNUSED( recurse_count ); + if ( limit - p < 4 ) { @@ -920,6 +1089,7 @@ decoder->stream->memory, p, png_len, + FALSE, FALSE ); Exit: @@ -937,7 +1107,9 @@ FT_ULong glyph_start, FT_ULong glyph_size, FT_Int x_pos, - FT_Int y_pos ) + FT_Int y_pos, + FT_UInt recurse_count, + FT_Bool metrics_only ) { FT_Error error; FT_Stream stream = decoder->stream; @@ -947,7 +1119,8 @@ /* seek into the EBDT table now */ - if ( glyph_start + glyph_size > decoder->ebdt_size ) + if ( !glyph_size || + glyph_start + glyph_size > decoder->ebdt_size ) { error = FT_THROW( Invalid_Argument ); goto Exit; @@ -1058,12 +1231,16 @@ if ( !decoder->bitmap_allocated ) { - error = tt_sbit_decoder_alloc_bitmap( decoder ); + error = tt_sbit_decoder_alloc_bitmap( decoder, metrics_only ); + if ( error ) goto Fail; } - error = loader( decoder, p, p_limit, x_pos, y_pos ); + if ( metrics_only ) + goto Fail; /* this is not an error */ + + error = loader( decoder, p, p_limit, x_pos, y_pos, recurse_count ); } Fail: @@ -1078,13 +1255,10 @@ tt_sbit_decoder_load_image( TT_SBitDecoder decoder, FT_UInt glyph_index, FT_Int x_pos, - FT_Int y_pos ) + FT_Int y_pos, + FT_UInt recurse_count, + FT_Bool metrics_only ) { - /* - * First, we find the correct strike range that applies to this - * glyph index. - */ - FT_Byte* p = decoder->eblc_base + decoder->strike_index_array; FT_Byte* p_limit = decoder->eblc_limit; FT_ULong num_ranges = decoder->strike_index_count; @@ -1092,6 +1266,17 @@ FT_ULong image_start = 0, image_end = 0, image_offset; + /* arbitrary recursion limit */ + if ( recurse_count > 100 ) + { + FT_TRACE4(( "tt_sbit_decoder_load_image:" + " recursion depth exceeded\n" )); + goto Failure; + } + + + /* First, we find the correct strike range that applies to this */ + /* glyph index. */ for ( ; num_ranges > 0; num_ranges-- ) { start = FT_NEXT_USHORT( p ); @@ -1256,16 +1441,25 @@ image_start, image_end, x_pos, - y_pos ); + y_pos, + recurse_count, + metrics_only ); Failure: return FT_THROW( Invalid_Table ); NoBitmap: + if ( recurse_count ) + { + FT_TRACE4(( "tt_sbit_decoder_load_image:" + " missing subglyph sbit with glyph index %d\n", + glyph_index )); + return FT_THROW( Invalid_Composite ); + } + FT_TRACE4(( "tt_sbit_decoder_load_image:" " no sbit found for glyph index %d\n", glyph_index )); - - return FT_THROW( Invalid_Argument ); + return FT_THROW( Missing_Bitmap ); } @@ -1275,10 +1469,10 @@ FT_UInt glyph_index, FT_Stream stream, FT_Bitmap *map, - TT_SBit_MetricsRec *metrics ) + TT_SBit_MetricsRec *metrics, + FT_Bool metrics_only ) { - FT_UInt sbix_pos, strike_offset, glyph_start, glyph_end; - FT_ULong table_size; + FT_UInt strike_offset, glyph_start, glyph_end; FT_Int originOffsetX, originOffsetY; FT_Tag graphicType; FT_Int recurse_depth = 0; @@ -1287,7 +1481,12 @@ FT_Byte* p; FT_UNUSED( map ); +#ifndef FT_CONFIG_OPTION_USE_PNG + FT_UNUSED( metrics_only ); +#endif + + strike_index = face->sbit_strike_map[strike_index]; metrics->width = 0; metrics->height = 0; @@ -1295,21 +1494,18 @@ p = face->sbit_table + 8 + 4 * strike_index; strike_offset = FT_NEXT_ULONG( p ); - error = face->goto_table( face, TTAG_sbix, stream, &table_size ); - if ( error ) - return error; - sbix_pos = FT_STREAM_POS(); - retry: if ( glyph_index > (FT_UInt)face->root.num_glyphs ) return FT_THROW( Invalid_Argument ); - if ( strike_offset >= table_size || - table_size - strike_offset < 4 + glyph_index * 4 + 8 ) + if ( strike_offset >= face->ebdt_size || + face->ebdt_size - strike_offset < 4 + glyph_index * 4 + 8 ) return FT_THROW( Invalid_File_Format ); - if ( FT_STREAM_SEEK( sbix_pos + strike_offset + 4 + glyph_index * 4 ) || - FT_FRAME_ENTER( 8 ) ) + if ( FT_STREAM_SEEK( face->ebdt_start + + strike_offset + 4 + + glyph_index * 4 ) || + FT_FRAME_ENTER( 8 ) ) return error; glyph_start = FT_GET_ULONG(); @@ -1318,14 +1514,14 @@ FT_FRAME_EXIT(); if ( glyph_start == glyph_end ) - return FT_THROW( Invalid_Argument ); - if ( glyph_start > glyph_end || - glyph_end - glyph_start < 8 || - table_size - strike_offset < glyph_end ) + return FT_THROW( Missing_Bitmap ); + if ( glyph_start > glyph_end || + glyph_end - glyph_start < 8 || + face->ebdt_size - strike_offset < glyph_end ) return FT_THROW( Invalid_File_Format ); - if ( FT_STREAM_SEEK( sbix_pos + strike_offset + glyph_start ) || - FT_FRAME_ENTER( glyph_end - glyph_start ) ) + if ( FT_STREAM_SEEK( face->ebdt_start + strike_offset + glyph_start ) || + FT_FRAME_ENTER( glyph_end - glyph_start ) ) return error; originOffsetX = FT_GET_SHORT(); @@ -1356,7 +1552,8 @@ stream->memory, stream->cursor, glyph_end - glyph_start - 8, - TRUE ); + TRUE, + metrics_only ); #else error = FT_THROW( Unimplemented_Feature ); #endif @@ -1416,22 +1613,27 @@ error = tt_sbit_decoder_init( decoder, face, strike_index, metrics ); if ( !error ) { - error = tt_sbit_decoder_load_image( decoder, - glyph_index, - 0, - 0 ); + error = tt_sbit_decoder_load_image( + decoder, + glyph_index, + 0, + 0, + 0, + ( load_flags & FT_LOAD_BITMAP_METRICS_ONLY ) != 0 ); tt_sbit_decoder_done( decoder ); } } break; case TT_SBIT_TABLE_TYPE_SBIX: - error = tt_face_load_sbix_image( face, - strike_index, - glyph_index, - stream, - map, - metrics ); + error = tt_face_load_sbix_image( + face, + strike_index, + glyph_index, + stream, + map, + metrics, + ( load_flags & FT_LOAD_BITMAP_METRICS_ONLY ) != 0 ); break; default: @@ -1440,9 +1642,10 @@ } /* Flatten color bitmaps if color was not requested. */ - if ( !error && - !( load_flags & FT_LOAD_COLOR ) && - map->pixel_mode == FT_PIXEL_MODE_BGRA ) + if ( !error && + !( load_flags & FT_LOAD_COLOR ) && + !( load_flags & FT_LOAD_BITMAP_METRICS_ONLY ) && + map->pixel_mode == FT_PIXEL_MODE_BGRA ) { FT_Bitmap new_map; FT_Library library = face->root.glyph->library; @@ -1468,5 +1671,12 @@ return error; } +#else /* !TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ + + /* ANSI C doesn't like empty source files */ + typedef int _tt_sbit_dummy; + +#endif /* !TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ + -/* EOF */ +/* END */ |