diff -r a501f5ec7b34 -r 0f5961910e27 misc/libfreetype/src/sfnt/ttsbit.c --- a/misc/libfreetype/src/sfnt/ttsbit.c Tue Jul 16 11:14:27 2013 +0200 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,1508 +0,0 @@ -/***************************************************************************/ -/* */ -/* ttsbit.c */ -/* */ -/* TrueType and OpenType embedded bitmap support (body). */ -/* */ -/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, */ -/* 2010 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 -#include FT_INTERNAL_DEBUG_H -#include FT_INTERNAL_STREAM_H -#include FT_TRUETYPE_TAGS_H - - /* - * Alas, the memory-optimized sbit loader can't be used when implementing - * the `old internals' hack - */ -#ifndef FT_CONFIG_OPTION_OLD_INTERNALS - -#include "ttsbit0.c" - -#else /* FT_CONFIG_OPTION_OLD_INTERNALS */ - -#include -#include FT_INTERNAL_DEBUG_H -#include FT_INTERNAL_STREAM_H -#include FT_TRUETYPE_TAGS_H -#include "ttsbit.h" - -#include "sferrors.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. */ - /* */ -#undef FT_COMPONENT -#define FT_COMPONENT trace_ttsbit - - - /*************************************************************************/ - /* */ - /* */ - /* blit_sbit */ - /* */ - /* */ - /* Blits a bitmap from an input stream into a given target. Supports */ - /* x and y offsets as well as byte padded lines. */ - /* */ - /* */ - /* target :: The target bitmap/pixmap. */ - /* */ - /* source :: The input packed bitmap data. */ - /* */ - /* line_bits :: The number of bits per line. */ - /* */ - /* byte_padded :: A flag which is true if lines are byte-padded. */ - /* */ - /* x_offset :: The horizontal offset. */ - /* */ - /* y_offset :: The vertical offset. */ - /* */ - /* */ - /* IMPORTANT: The x and y offsets are relative to the top corner of */ - /* the target bitmap (unlike the normal TrueType */ - /* convention). A positive y offset indicates a downwards */ - /* direction! */ - /* */ - static void - blit_sbit( FT_Bitmap* target, - FT_Byte* source, - FT_Int line_bits, - FT_Bool byte_padded, - FT_Int x_offset, - FT_Int y_offset, - FT_Int source_height ) - { - FT_Byte* line_buff; - FT_Int line_incr; - FT_Int height; - - FT_UShort acc; - FT_UInt loaded; - - - /* first of all, compute starting write position */ - line_incr = target->pitch; - line_buff = target->buffer; - - if ( line_incr < 0 ) - line_buff -= line_incr * ( target->rows - 1 ); - - line_buff += ( x_offset >> 3 ) + y_offset * line_incr; - - /***********************************************************************/ - /* */ - /* We use the extra-classic `accumulator' trick to extract the bits */ - /* from the source byte stream. */ - /* */ - /* Namely, the variable `acc' is a 16-bit accumulator containing the */ - /* last `loaded' bits from the input stream. The bits are shifted to */ - /* the upmost position in `acc'. */ - /* */ - /***********************************************************************/ - - acc = 0; /* clear accumulator */ - loaded = 0; /* no bits were loaded */ - - for ( height = source_height; height > 0; height-- ) - { - FT_Byte* cur = line_buff; /* current write cursor */ - FT_Int count = line_bits; /* # of bits to extract per line */ - FT_Byte shift = (FT_Byte)( x_offset & 7 ); /* current write shift */ - FT_Byte space = (FT_Byte)( 8 - shift ); - - - /* first of all, read individual source bytes */ - if ( count >= 8 ) - { - count -= 8; - { - do - { - FT_Byte val; - - - /* ensure that there are at least 8 bits in the accumulator */ - if ( loaded < 8 ) - { - acc |= (FT_UShort)((FT_UShort)*source++ << ( 8 - loaded )); - loaded += 8; - } - - /* now write one byte */ - val = (FT_Byte)( acc >> 8 ); - if ( shift ) - { - cur[0] |= (FT_Byte)( val >> shift ); - cur[1] |= (FT_Byte)( val << space ); - } - else - cur[0] |= val; - - cur++; - acc <<= 8; /* remove bits from accumulator */ - loaded -= 8; - count -= 8; - - } while ( count >= 0 ); - } - - /* restore `count' to correct value */ - count += 8; - } - - /* now write remaining bits (count < 8) */ - if ( count > 0 ) - { - FT_Byte val; - - - /* ensure that there are at least `count' bits in the accumulator */ - if ( (FT_Int)loaded < count ) - { - acc |= (FT_UShort)((FT_UShort)*source++ << ( 8 - loaded )); - loaded += 8; - } - - /* now write remaining bits */ - val = (FT_Byte)( ( (FT_Byte)( acc >> 8 ) ) & ~( 0xFF >> count ) ); - cur[0] |= (FT_Byte)( val >> shift ); - - if ( count > space ) - cur[1] |= (FT_Byte)( val << space ); - - acc <<= count; - loaded -= count; - } - - /* now, skip to next line */ - if ( byte_padded ) - { - acc = 0; - loaded = 0; /* clear accumulator on byte-padded lines */ - } - - line_buff += line_incr; - } - } - - - static const FT_Frame_Field sbit_metrics_fields[] = - { -#undef FT_STRUCTURE -#define FT_STRUCTURE TT_SBit_MetricsRec - - FT_FRAME_START( 8 ), - FT_FRAME_BYTE( height ), - FT_FRAME_BYTE( width ), - - FT_FRAME_CHAR( horiBearingX ), - FT_FRAME_CHAR( horiBearingY ), - FT_FRAME_BYTE( horiAdvance ), - - FT_FRAME_CHAR( vertBearingX ), - FT_FRAME_CHAR( vertBearingY ), - FT_FRAME_BYTE( vertAdvance ), - FT_FRAME_END - }; - - - /*************************************************************************/ - /* */ - /* */ - /* Load_SBit_Const_Metrics */ - /* */ - /* */ - /* Loads the metrics for `EBLC' index tables format 2 and 5. */ - /* */ - /* */ - /* range :: The target range. */ - /* */ - /* stream :: The input stream. */ - /* */ - /* */ - /* FreeType error code. 0 means success. */ - /* */ - static FT_Error - Load_SBit_Const_Metrics( TT_SBit_Range range, - FT_Stream stream ) - { - FT_Error error; - - - if ( FT_READ_ULONG( range->image_size ) ) - return error; - - return FT_STREAM_READ_FIELDS( sbit_metrics_fields, &range->metrics ); - } - - - /*************************************************************************/ - /* */ - /* */ - /* Load_SBit_Range_Codes */ - /* */ - /* */ - /* Loads the range codes for `EBLC' index tables format 4 and 5. */ - /* */ - /* */ - /* range :: The target range. */ - /* */ - /* stream :: The input stream. */ - /* */ - /* load_offsets :: A flag whether to load the glyph offset table. */ - /* */ - /* */ - /* FreeType error code. 0 means success. */ - /* */ - static FT_Error - Load_SBit_Range_Codes( TT_SBit_Range range, - FT_Stream stream, - FT_Bool load_offsets ) - { - FT_Error error; - FT_ULong count, n, size; - FT_Memory memory = stream->memory; - - - if ( FT_READ_ULONG( count ) ) - goto Exit; - - range->num_glyphs = count; - - /* Allocate glyph offsets table if needed */ - if ( load_offsets ) - { - if ( FT_NEW_ARRAY( range->glyph_offsets, count ) ) - goto Exit; - - size = count * 4L; - } - else - size = count * 2L; - - /* Allocate glyph codes table and access frame */ - if ( FT_NEW_ARRAY ( range->glyph_codes, count ) || - FT_FRAME_ENTER( size ) ) - goto Exit; - - for ( n = 0; n < count; n++ ) - { - range->glyph_codes[n] = FT_GET_USHORT(); - - if ( load_offsets ) - range->glyph_offsets[n] = (FT_ULong)range->image_offset + - FT_GET_USHORT(); - } - - FT_FRAME_EXIT(); - - Exit: - return error; - } - - - /*************************************************************************/ - /* */ - /* */ - /* Load_SBit_Range */ - /* */ - /* */ - /* Loads a given `EBLC' index/range table. */ - /* */ - /* */ - /* range :: The target range. */ - /* */ - /* stream :: The input stream. */ - /* */ - /* */ - /* FreeType error code. 0 means success. */ - /* */ - static FT_Error - Load_SBit_Range( TT_SBit_Range range, - FT_Stream stream ) - { - FT_Error error; - FT_Memory memory = stream->memory; - - - switch( range->index_format ) - { - case 1: /* variable metrics with 4-byte offsets */ - case 3: /* variable metrics with 2-byte offsets */ - { - FT_ULong num_glyphs, n; - FT_Int size_elem; - FT_Bool large = FT_BOOL( range->index_format == 1 ); - - - - if ( range->last_glyph < range->first_glyph ) - { - error = SFNT_Err_Invalid_File_Format; - goto Exit; - } - - num_glyphs = range->last_glyph - range->first_glyph + 1L; - range->num_glyphs = num_glyphs; - num_glyphs++; /* XXX: BEWARE - see spec */ - - size_elem = large ? 4 : 2; - - if ( FT_NEW_ARRAY( range->glyph_offsets, num_glyphs ) || - FT_FRAME_ENTER( num_glyphs * size_elem ) ) - goto Exit; - - for ( n = 0; n < num_glyphs; n++ ) - range->glyph_offsets[n] = (FT_ULong)( range->image_offset + - ( large ? FT_GET_ULONG() - : FT_GET_USHORT() ) ); - FT_FRAME_EXIT(); - } - break; - - case 2: /* all glyphs have identical metrics */ - error = Load_SBit_Const_Metrics( range, stream ); - break; - - case 4: - error = Load_SBit_Range_Codes( range, stream, 1 ); - break; - - case 5: - error = Load_SBit_Const_Metrics( range, stream ); - if ( !error ) - error = Load_SBit_Range_Codes( range, stream, 0 ); - break; - - default: - error = SFNT_Err_Invalid_File_Format; - } - - Exit: - return error; - } - - - /*************************************************************************/ - /* */ - /* */ - /* tt_face_load_eblc */ - /* */ - /* */ - /* Loads the table of embedded bitmap sizes for this face. */ - /* */ - /* */ - /* face :: The target face object. */ - /* */ - /* stream :: The input stream. */ - /* */ - /* */ - /* FreeType error code. 0 means success. */ - /* */ - FT_LOCAL_DEF( FT_Error ) - tt_face_load_eblc( TT_Face face, - FT_Stream stream ) - { - FT_Error error = SFNT_Err_Ok; - FT_Memory memory = stream->memory; - FT_Fixed version; - FT_ULong num_strikes; - FT_ULong table_base; - - static const FT_Frame_Field sbit_line_metrics_fields[] = - { -#undef FT_STRUCTURE -#define FT_STRUCTURE TT_SBit_LineMetricsRec - - /* no FT_FRAME_START */ - FT_FRAME_CHAR( ascender ), - FT_FRAME_CHAR( descender ), - FT_FRAME_BYTE( max_width ), - - FT_FRAME_CHAR( caret_slope_numerator ), - FT_FRAME_CHAR( caret_slope_denominator ), - FT_FRAME_CHAR( caret_offset ), - - FT_FRAME_CHAR( min_origin_SB ), - FT_FRAME_CHAR( min_advance_SB ), - FT_FRAME_CHAR( max_before_BL ), - FT_FRAME_CHAR( min_after_BL ), - FT_FRAME_CHAR( pads[0] ), - FT_FRAME_CHAR( pads[1] ), - FT_FRAME_END - }; - - static const FT_Frame_Field strike_start_fields[] = - { -#undef FT_STRUCTURE -#define FT_STRUCTURE TT_SBit_StrikeRec - - /* no FT_FRAME_START */ - FT_FRAME_ULONG( ranges_offset ), - FT_FRAME_SKIP_LONG, - FT_FRAME_ULONG( num_ranges ), - FT_FRAME_ULONG( color_ref ), - FT_FRAME_END - }; - - static const FT_Frame_Field strike_end_fields[] = - { - /* no FT_FRAME_START */ - FT_FRAME_USHORT( start_glyph ), - FT_FRAME_USHORT( end_glyph ), - FT_FRAME_BYTE ( x_ppem ), - FT_FRAME_BYTE ( y_ppem ), - FT_FRAME_BYTE ( bit_depth ), - FT_FRAME_CHAR ( flags ), - FT_FRAME_END - }; - - - face->num_sbit_strikes = 0; - - /* this table is optional */ - error = face->goto_table( face, TTAG_EBLC, stream, 0 ); - if ( error ) - error = face->goto_table( face, TTAG_bloc, stream, 0 ); - if ( error ) - goto Exit; - - table_base = FT_STREAM_POS(); - if ( FT_FRAME_ENTER( 8L ) ) - goto Exit; - - version = FT_GET_LONG(); - num_strikes = FT_GET_ULONG(); - - FT_FRAME_EXIT(); - - /* check version number and strike count */ - if ( version != 0x00020000L || - num_strikes >= 0x10000L ) - { - FT_ERROR(( "tt_face_load_sbit_strikes: invalid table version\n" )); - error = SFNT_Err_Invalid_File_Format; - - goto Exit; - } - - /* allocate the strikes table */ - if ( FT_NEW_ARRAY( face->sbit_strikes, num_strikes ) ) - goto Exit; - - face->num_sbit_strikes = num_strikes; - - /* now read each strike table separately */ - { - TT_SBit_Strike strike = face->sbit_strikes; - FT_ULong count = num_strikes; - - - if ( FT_FRAME_ENTER( 48L * num_strikes ) ) - goto Exit; - - while ( count > 0 ) - { - if ( FT_STREAM_READ_FIELDS( strike_start_fields, strike ) || - FT_STREAM_READ_FIELDS( sbit_line_metrics_fields, &strike->hori ) || - FT_STREAM_READ_FIELDS( sbit_line_metrics_fields, &strike->vert ) || - FT_STREAM_READ_FIELDS( strike_end_fields, strike ) ) - break; - - count--; - strike++; - } - - FT_FRAME_EXIT(); - } - - /* allocate the index ranges for each strike table */ - { - TT_SBit_Strike strike = face->sbit_strikes; - FT_ULong count = num_strikes; - - - while ( count > 0 ) - { - TT_SBit_Range range; - FT_ULong count2 = strike->num_ranges; - - - /* read each range */ - if ( FT_STREAM_SEEK( table_base + strike->ranges_offset ) || - FT_FRAME_ENTER( strike->num_ranges * 8L ) ) - goto Exit; - - if ( FT_NEW_ARRAY( strike->sbit_ranges, strike->num_ranges ) ) - goto Exit; - - range = strike->sbit_ranges; - while ( count2 > 0 ) - { - range->first_glyph = FT_GET_USHORT(); - range->last_glyph = FT_GET_USHORT(); - range->table_offset = table_base + strike->ranges_offset + - FT_GET_ULONG(); - count2--; - range++; - } - - FT_FRAME_EXIT(); - - /* Now, read each index table */ - count2 = strike->num_ranges; - range = strike->sbit_ranges; - while ( count2 > 0 ) - { - /* Read the header */ - if ( FT_STREAM_SEEK( range->table_offset ) || - FT_FRAME_ENTER( 8L ) ) - goto Exit; - - range->index_format = FT_GET_USHORT(); - range->image_format = FT_GET_USHORT(); - range->image_offset = FT_GET_ULONG(); - - FT_FRAME_EXIT(); - - error = Load_SBit_Range( range, stream ); - if ( error ) - goto Exit; - - count2--; - range++; - } - - count--; - strike++; - } - } - - Exit: - return error; - } - - - /*************************************************************************/ - /* */ - /* */ - /* tt_face_free_eblc */ - /* */ - /* */ - /* Releases the embedded bitmap tables. */ - /* */ - /* */ - /* face :: The target face object. */ - /* */ - FT_LOCAL_DEF( void ) - tt_face_free_eblc( TT_Face face ) - { - FT_Memory memory = face->root.memory; - TT_SBit_Strike strike = face->sbit_strikes; - TT_SBit_Strike strike_limit = strike + face->num_sbit_strikes; - - - if ( strike ) - { - for ( ; strike < strike_limit; strike++ ) - { - TT_SBit_Range range = strike->sbit_ranges; - TT_SBit_Range range_limit = range + strike->num_ranges; - - - if ( range ) - { - for ( ; range < range_limit; range++ ) - { - /* release the glyph offsets and codes tables */ - /* where appropriate */ - FT_FREE( range->glyph_offsets ); - FT_FREE( range->glyph_codes ); - } - } - FT_FREE( strike->sbit_ranges ); - strike->num_ranges = 0; - } - FT_FREE( face->sbit_strikes ); - } - face->num_sbit_strikes = 0; - } - - - FT_LOCAL_DEF( FT_Error ) - tt_face_set_sbit_strike( TT_Face face, - FT_Size_Request req, - FT_ULong* astrike_index ) - { - return FT_Match_Size( (FT_Face)face, req, 0, astrike_index ); - } - - - FT_LOCAL_DEF( FT_Error ) - tt_face_load_strike_metrics( TT_Face face, - FT_ULong strike_index, - FT_Size_Metrics* metrics ) - { - TT_SBit_Strike strike; - - - if ( strike_index >= face->num_sbit_strikes ) - return SFNT_Err_Invalid_Argument; - - strike = face->sbit_strikes + strike_index; - - metrics->x_ppem = strike->x_ppem; - metrics->y_ppem = strike->y_ppem; - - metrics->ascender = strike->hori.ascender << 6; - metrics->descender = strike->hori.descender << 6; - - /* XXX: Is this correct? */ - metrics->max_advance = ( strike->hori.min_origin_SB + - strike->hori.max_width + - strike->hori.min_advance_SB ) << 6; - - metrics->height = metrics->ascender - metrics->descender; - - return SFNT_Err_Ok; - } - - - /*************************************************************************/ - /* */ - /* */ - /* find_sbit_range */ - /* */ - /* */ - /* Scans a given strike's ranges and return, for a given glyph */ - /* index, the corresponding sbit range, and `EBDT' offset. */ - /* */ - /* */ - /* glyph_index :: The glyph index. */ - /* */ - /* strike :: The source/current sbit strike. */ - /* */ - /* */ - /* arange :: The sbit range containing the glyph index. */ - /* */ - /* aglyph_offset :: The offset of the glyph data in `EBDT' table. */ - /* */ - /* */ - /* FreeType error code. 0 means the glyph index was found. */ - /* */ - static FT_Error - find_sbit_range( FT_UInt glyph_index, - TT_SBit_Strike strike, - TT_SBit_Range *arange, - FT_ULong *aglyph_offset ) - { - TT_SBit_RangeRec *range, *range_limit; - - - /* check whether the glyph index is within this strike's */ - /* glyph range */ - if ( glyph_index < (FT_UInt)strike->start_glyph || - glyph_index > (FT_UInt)strike->end_glyph ) - goto Fail; - - /* scan all ranges in strike */ - range = strike->sbit_ranges; - range_limit = range + strike->num_ranges; - if ( !range ) - goto Fail; - - for ( ; range < range_limit; range++ ) - { - if ( glyph_index >= (FT_UInt)range->first_glyph && - glyph_index <= (FT_UInt)range->last_glyph ) - { - FT_UShort delta = (FT_UShort)( glyph_index - range->first_glyph ); - - - switch ( range->index_format ) - { - case 1: - case 3: - *aglyph_offset = range->glyph_offsets[delta]; - break; - - case 2: - *aglyph_offset = range->image_offset + - range->image_size * delta; - break; - - case 4: - case 5: - { - FT_ULong n; - - - for ( n = 0; n < range->num_glyphs; n++ ) - { - if ( (FT_UInt)range->glyph_codes[n] == glyph_index ) - { - if ( range->index_format == 4 ) - *aglyph_offset = range->glyph_offsets[n]; - else - *aglyph_offset = range->image_offset + - n * range->image_size; - goto Found; - } - } - } - - /* fall-through */ - default: - goto Fail; - } - - Found: - /* return successfully! */ - *arange = range; - return SFNT_Err_Ok; - } - } - - Fail: - *arange = 0; - *aglyph_offset = 0; - - return SFNT_Err_Invalid_Argument; - } - - - /*************************************************************************/ - /* */ - /* */ - /* tt_find_sbit_image */ - /* */ - /* */ - /* Checks whether an embedded bitmap (an `sbit') exists for a given */ - /* glyph, at a given strike. */ - /* */ - /* */ - /* face :: The target face object. */ - /* */ - /* glyph_index :: The glyph index. */ - /* */ - /* strike_index :: The current strike index. */ - /* */ - /* */ - /* arange :: The SBit range containing the glyph index. */ - /* */ - /* astrike :: The SBit strike containing the glyph index. */ - /* */ - /* aglyph_offset :: The offset of the glyph data in `EBDT' table. */ - /* */ - /* */ - /* FreeType error code. 0 means success. Returns */ - /* SFNT_Err_Invalid_Argument if no sbit exists for the requested */ - /* glyph. */ - /* */ - FT_LOCAL( FT_Error ) - tt_find_sbit_image( TT_Face face, - FT_UInt glyph_index, - FT_ULong strike_index, - TT_SBit_Range *arange, - TT_SBit_Strike *astrike, - FT_ULong *aglyph_offset ) - { - FT_Error error; - TT_SBit_Strike strike; - - - if ( !face->sbit_strikes || - ( face->num_sbit_strikes <= strike_index ) ) - goto Fail; - - strike = &face->sbit_strikes[strike_index]; - - error = find_sbit_range( glyph_index, strike, - arange, aglyph_offset ); - if ( error ) - goto Fail; - - *astrike = strike; - - return SFNT_Err_Ok; - - Fail: - /* no embedded bitmap for this glyph in face */ - *arange = 0; - *astrike = 0; - *aglyph_offset = 0; - - return SFNT_Err_Invalid_Argument; - } - - - /*************************************************************************/ - /* */ - /* */ - /* tt_load_sbit_metrics */ - /* */ - /* */ - /* Gets the big metrics for a given SBit. */ - /* */ - /* */ - /* stream :: The input stream. */ - /* */ - /* range :: The SBit range containing the glyph. */ - /* */ - /* */ - /* big_metrics :: A big SBit metrics structure for the glyph. */ - /* */ - /* */ - /* FreeType error code. 0 means success. */ - /* */ - /* */ - /* The stream cursor must be positioned at the glyph's offset within */ - /* the `EBDT' table before the call. */ - /* */ - /* If the image format uses variable metrics, the stream cursor is */ - /* positioned just after the metrics header in the `EBDT' table on */ - /* function exit. */ - /* */ - FT_LOCAL( FT_Error ) - tt_load_sbit_metrics( FT_Stream stream, - TT_SBit_Range range, - TT_SBit_Metrics metrics ) - { - FT_Error error = SFNT_Err_Ok; - - - switch ( range->image_format ) - { - case 1: - case 2: - case 8: - /* variable small metrics */ - { - TT_SBit_SmallMetricsRec smetrics; - - static const FT_Frame_Field sbit_small_metrics_fields[] = - { -#undef FT_STRUCTURE -#define FT_STRUCTURE TT_SBit_SmallMetricsRec - - FT_FRAME_START( 5 ), - FT_FRAME_BYTE( height ), - FT_FRAME_BYTE( width ), - FT_FRAME_CHAR( bearingX ), - FT_FRAME_CHAR( bearingY ), - FT_FRAME_BYTE( advance ), - FT_FRAME_END - }; - - - /* read small metrics */ - if ( FT_STREAM_READ_FIELDS( sbit_small_metrics_fields, &smetrics ) ) - goto Exit; - - /* convert it to a big metrics */ - metrics->height = smetrics.height; - metrics->width = smetrics.width; - metrics->horiBearingX = smetrics.bearingX; - metrics->horiBearingY = smetrics.bearingY; - metrics->horiAdvance = smetrics.advance; - - /* these metrics are made up at a higher level when */ - /* needed. */ - metrics->vertBearingX = 0; - metrics->vertBearingY = 0; - metrics->vertAdvance = 0; - } - break; - - case 6: - case 7: - case 9: - /* variable big metrics */ - if ( FT_STREAM_READ_FIELDS( sbit_metrics_fields, metrics ) ) - goto Exit; - break; - - case 5: - default: /* constant metrics */ - if ( range->index_format == 2 || range->index_format == 5 ) - *metrics = range->metrics; - else - return SFNT_Err_Invalid_File_Format; - } - - Exit: - return error; - } - - - /*************************************************************************/ - /* */ - /* */ - /* crop_bitmap */ - /* */ - /* */ - /* Crops a bitmap to its tightest bounding box, and adjusts its */ - /* metrics. */ - /* */ - /* */ - /* map :: The bitmap. */ - /* */ - /* metrics :: The corresponding metrics structure. */ - /* */ - static void - crop_bitmap( FT_Bitmap* map, - TT_SBit_Metrics metrics ) - { - /***********************************************************************/ - /* */ - /* In this situation, some bounding boxes of embedded bitmaps are too */ - /* large. We need to crop it to a reasonable size. */ - /* */ - /* --------- */ - /* | | ----- */ - /* | *** | |***| */ - /* | * | | * | */ - /* | * | ------> | * | */ - /* | * | | * | */ - /* | * | | * | */ - /* | *** | |***| */ - /* --------- ----- */ - /* */ - /***********************************************************************/ - - FT_Int rows, count; - FT_Long line_len; - FT_Byte* line; - - - /***********************************************************************/ - /* */ - /* first of all, check the top-most lines of the bitmap, and remove */ - /* them if they're empty. */ - /* */ - { - line = (FT_Byte*)map->buffer; - rows = map->rows; - line_len = map->pitch; - - - for ( count = 0; count < rows; count++ ) - { - FT_Byte* cur = line; - FT_Byte* limit = line + line_len; - - - for ( ; cur < limit; cur++ ) - if ( cur[0] ) - goto Found_Top; - - /* the current line was empty - skip to next one */ - line = limit; - } - - Found_Top: - /* check that we have at least one filled line */ - if ( count >= rows ) - goto Empty_Bitmap; - - /* now, crop the empty upper lines */ - if ( count > 0 ) - { - line = (FT_Byte*)map->buffer; - - FT_MEM_MOVE( line, line + count * line_len, - ( rows - count ) * line_len ); - - metrics->height = (FT_Byte)( metrics->height - count ); - metrics->horiBearingY = (FT_Char)( metrics->horiBearingY - count ); - metrics->vertBearingY = (FT_Char)( metrics->vertBearingY - count ); - - map->rows -= count; - rows -= count; - } - } - - /***********************************************************************/ - /* */ - /* second, crop the lower lines */ - /* */ - { - line = (FT_Byte*)map->buffer + ( rows - 1 ) * line_len; - - for ( count = 0; count < rows; count++ ) - { - FT_Byte* cur = line; - FT_Byte* limit = line + line_len; - - - for ( ; cur < limit; cur++ ) - if ( cur[0] ) - goto Found_Bottom; - - /* the current line was empty - skip to previous one */ - line -= line_len; - } - - Found_Bottom: - if ( count > 0 ) - { - metrics->height = (FT_Byte)( metrics->height - count ); - rows -= count; - map->rows -= count; - } - } - - /***********************************************************************/ - /* */ - /* third, get rid of the space on the left side of the glyph */ - /* */ - do - { - FT_Byte* limit; - - - line = (FT_Byte*)map->buffer; - limit = line + rows * line_len; - - for ( ; line < limit; line += line_len ) - if ( line[0] & 0x80 ) - goto Found_Left; - - /* shift the whole glyph one pixel to the left */ - line = (FT_Byte*)map->buffer; - limit = line + rows * line_len; - - for ( ; line < limit; line += line_len ) - { - FT_Int n, width = map->width; - FT_Byte old; - FT_Byte* cur = line; - - - old = (FT_Byte)(cur[0] << 1); - for ( n = 8; n < width; n += 8 ) - { - FT_Byte val; - - - val = cur[1]; - cur[0] = (FT_Byte)( old | ( val >> 7 ) ); - old = (FT_Byte)( val << 1 ); - cur++; - } - cur[0] = old; - } - - map->width--; - metrics->horiBearingX++; - metrics->vertBearingX++; - metrics->width--; - - } while ( map->width > 0 ); - - Found_Left: - - /***********************************************************************/ - /* */ - /* finally, crop the bitmap width to get rid of the space on the right */ - /* side of the glyph. */ - /* */ - do - { - FT_Int right = map->width - 1; - FT_Byte* limit; - FT_Byte mask; - - - line = (FT_Byte*)map->buffer + ( right >> 3 ); - limit = line + rows * line_len; - mask = (FT_Byte)( 0x80 >> ( right & 7 ) ); - - for ( ; line < limit; line += line_len ) - if ( line[0] & mask ) - goto Found_Right; - - /* crop the whole glyph to the right */ - map->width--; - metrics->width--; - - } while ( map->width > 0 ); - - Found_Right: - /* all right, the bitmap was cropped */ - return; - - Empty_Bitmap: - map->width = 0; - map->rows = 0; - map->pitch = 0; - map->pixel_mode = FT_PIXEL_MODE_MONO; - } - - - static FT_Error - Load_SBit_Single( FT_Bitmap* map, - FT_Int x_offset, - FT_Int y_offset, - FT_Int pix_bits, - FT_UShort image_format, - TT_SBit_Metrics metrics, - FT_Stream stream ) - { - FT_Error error; - - - /* check that the source bitmap fits into the target pixmap */ - if ( x_offset < 0 || x_offset + metrics->width > map->width || - y_offset < 0 || y_offset + metrics->height > map->rows ) - { - error = SFNT_Err_Invalid_Argument; - - goto Exit; - } - - { - FT_Int glyph_width = metrics->width; - FT_Int glyph_height = metrics->height; - FT_Int glyph_size; - FT_Int line_bits = pix_bits * glyph_width; - FT_Bool pad_bytes = 0; - - - /* compute size of glyph image */ - switch ( image_format ) - { - case 1: /* byte-padded formats */ - case 6: - { - FT_Int line_length; - - - switch ( pix_bits ) - { - case 1: - line_length = ( glyph_width + 7 ) >> 3; - break; - case 2: - line_length = ( glyph_width + 3 ) >> 2; - break; - case 4: - line_length = ( glyph_width + 1 ) >> 1; - break; - default: - line_length = glyph_width; - } - - glyph_size = glyph_height * line_length; - pad_bytes = 1; - } - break; - - case 2: - case 5: - case 7: - line_bits = glyph_width * pix_bits; - glyph_size = ( glyph_height * line_bits + 7 ) >> 3; - break; - - default: /* invalid format */ - return SFNT_Err_Invalid_File_Format; - } - - /* Now read data and draw glyph into target pixmap */ - if ( FT_FRAME_ENTER( glyph_size ) ) - goto Exit; - - /* don't forget to multiply `x_offset' by `map->pix_bits' as */ - /* the sbit blitter doesn't make a difference between pixmap */ - /* depths. */ - blit_sbit( map, (FT_Byte*)stream->cursor, line_bits, pad_bytes, - x_offset * pix_bits, y_offset, metrics->height ); - - FT_FRAME_EXIT(); - } - - Exit: - return error; - } - - - static FT_Error - Load_SBit_Image( TT_SBit_Strike strike, - TT_SBit_Range range, - FT_ULong ebdt_pos, - FT_ULong glyph_offset, - FT_GlyphSlot slot, - FT_Int x_offset, - FT_Int y_offset, - FT_Stream stream, - TT_SBit_Metrics metrics, - FT_Int depth ) - { - FT_Memory memory = stream->memory; - FT_Bitmap* map = &slot->bitmap; - FT_Error error; - - - /* place stream at beginning of glyph data and read metrics */ - if ( FT_STREAM_SEEK( ebdt_pos + glyph_offset ) ) - goto Exit; - - error = tt_load_sbit_metrics( stream, range, metrics ); - if ( error ) - goto Exit; - - /* This function is recursive. At the top-level call, we */ - /* compute the dimensions of the higher-level glyph to */ - /* allocate the final pixmap buffer. */ - if ( depth == 0 ) - { - FT_Long size; - - - map->width = metrics->width; - map->rows = metrics->height; - - switch ( strike->bit_depth ) - { - case 1: - map->pixel_mode = FT_PIXEL_MODE_MONO; - map->pitch = ( map->width + 7 ) >> 3; - break; - - case 2: - map->pixel_mode = FT_PIXEL_MODE_GRAY2; - map->pitch = ( map->width + 3 ) >> 2; - break; - - case 4: - map->pixel_mode = FT_PIXEL_MODE_GRAY4; - map->pitch = ( map->width + 1 ) >> 1; - break; - - case 8: - map->pixel_mode = FT_PIXEL_MODE_GRAY; - map->pitch = map->width; - break; - - default: - return SFNT_Err_Invalid_File_Format; - } - - size = map->rows * map->pitch; - - /* check that there is no empty image */ - if ( size == 0 ) - goto Exit; /* exit successfully! */ - - error = ft_glyphslot_alloc_bitmap( slot, size ); - if (error) - goto Exit; - } - - switch ( range->image_format ) - { - case 1: /* single sbit image - load it */ - case 2: - case 5: - case 6: - case 7: - return Load_SBit_Single( map, x_offset, y_offset, strike->bit_depth, - range->image_format, metrics, stream ); - - case 8: /* compound format */ - if ( FT_STREAM_SKIP( 1L ) ) - { - error = SFNT_Err_Invalid_Stream_Skip; - goto Exit; - } - /* fallthrough */ - - case 9: - break; - - default: /* invalid image format */ - return SFNT_Err_Invalid_File_Format; - } - - /* All right, we have a compound format. First of all, read */ - /* the array of elements. */ - { - TT_SBit_Component components; - TT_SBit_Component comp; - FT_UShort num_components, count; - - - if ( FT_READ_USHORT( num_components ) || - FT_NEW_ARRAY( components, num_components ) ) - goto Exit; - - count = num_components; - - if ( FT_FRAME_ENTER( 4L * num_components ) ) - goto Fail_Memory; - - for ( comp = components; count > 0; count--, comp++ ) - { - comp->glyph_code = FT_GET_USHORT(); - comp->x_offset = FT_GET_CHAR(); - comp->y_offset = FT_GET_CHAR(); - } - - FT_FRAME_EXIT(); - - /* Now recursively load each element glyph */ - count = num_components; - comp = components; - for ( ; count > 0; count--, comp++ ) - { - TT_SBit_Range elem_range; - TT_SBit_MetricsRec elem_metrics; - FT_ULong elem_offset; - - - /* find the range for this element */ - error = find_sbit_range( comp->glyph_code, - strike, - &elem_range, - &elem_offset ); - if ( error ) - goto Fail_Memory; - - /* now load the element, recursively */ - error = Load_SBit_Image( strike, - elem_range, - ebdt_pos, - elem_offset, - slot, - x_offset + comp->x_offset, - y_offset + comp->y_offset, - stream, - &elem_metrics, - depth + 1 ); - if ( error ) - goto Fail_Memory; - } - - Fail_Memory: - FT_FREE( components ); - } - - Exit: - return error; - } - - - /*************************************************************************/ - /* */ - /* */ - /* tt_face_load_sbit_image */ - /* */ - /* */ - /* Loads a given glyph sbit image from the font resource. This also */ - /* returns its metrics. */ - /* */ - /* */ - /* face :: The target face object. */ - /* */ - /* strike_index :: The current strike index. */ - /* */ - /* glyph_index :: The current glyph index. */ - /* */ - /* load_flags :: The glyph load flags (the code checks for the flag */ - /* FT_LOAD_CROP_BITMAP). */ - /* */ - /* stream :: The input stream. */ - /* */ - /* */ - /* map :: The target pixmap. */ - /* */ - /* metrics :: A big sbit metrics structure for the glyph image. */ - /* */ - /* */ - /* FreeType error code. 0 means success. Returns an error if no */ - /* glyph sbit exists for the index. */ - /* */ - /* */ - /* The `map.buffer' field is always freed before the glyph is loaded. */ - /* */ - FT_LOCAL_DEF( FT_Error ) - tt_face_load_sbit_image( TT_Face face, - FT_ULong strike_index, - FT_UInt glyph_index, - FT_UInt load_flags, - FT_Stream stream, - FT_Bitmap *map, - TT_SBit_MetricsRec *metrics ) - { - FT_Error error; - FT_ULong ebdt_pos, glyph_offset; - - TT_SBit_Strike strike; - TT_SBit_Range range; - - - /* Check whether there is a glyph sbit for the current index */ - error = tt_find_sbit_image( face, glyph_index, strike_index, - &range, &strike, &glyph_offset ); - if ( error ) - goto Exit; - - /* now, find the location of the `EBDT' table in */ - /* the font file */ - error = face->goto_table( face, TTAG_EBDT, stream, 0 ); - if ( error ) - error = face->goto_table( face, TTAG_bdat, stream, 0 ); - if ( error ) - goto Exit; - - ebdt_pos = FT_STREAM_POS(); - - error = Load_SBit_Image( strike, range, ebdt_pos, glyph_offset, - face->root.glyph, 0, 0, stream, metrics, 0 ); - if ( error ) - goto Exit; - - /* setup vertical metrics if needed */ - if ( strike->flags & 1 ) - { - /* in case of a horizontal strike only */ - FT_Int advance; - - - advance = strike->hori.ascender - strike->hori.descender; - - /* some heuristic values */ - - metrics->vertBearingX = (FT_Char)(-metrics->width / 2 ); - metrics->vertBearingY = (FT_Char)( ( advance - metrics->height ) / 2 ); - metrics->vertAdvance = (FT_Char)( advance * 12 / 10 ); - } - - /* Crop the bitmap now, unless specified otherwise */ - if ( load_flags & FT_LOAD_CROP_BITMAP ) - crop_bitmap( map, metrics ); - - Exit: - return error; - } - -#endif /* FT_CONFIG_OPTION_OLD_INTERNALS */ - - -/* END */