forked from minhngoc25a/freetype2
1468 lines
52 KiB
C
1468 lines
52 KiB
C
/***************************************************************************/
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/* */
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/* ttsbit.c */
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/* */
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/* TrueType and OpenType embedded bitmap support (body). */
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/* */
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/* Copyright 1996-2001 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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#include <ft2build.h>
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#include FT_INTERNAL_DEBUG_H
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#include FT_INTERNAL_STREAM_H
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#include FT_TRUETYPE_TAGS_H
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#include "ttsbit.h"
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#include "sferrors.h"
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/*************************************************************************/
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/* */
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/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
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/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
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/* messages during execution. */
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/* */
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#undef FT_COMPONENT
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#define FT_COMPONENT trace_ttsbit
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/*************************************************************************/
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/* */
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/* <Function> */
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/* blit_sbit */
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/* */
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/* <Description> */
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/* Blits a bitmap from an input stream into a given target. Supports */
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/* x and y offsets as well as byte padded lines. */
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/* */
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/* <Input> */
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/* target :: The target bitmap/pixmap. */
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/* */
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/* source :: The input packed bitmap data. */
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/* */
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/* line_bits :: The number of bits per line. */
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/* */
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/* byte_padded :: A flag which is true if lines are byte-padded. */
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/* */
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/* x_offset :: The horizontal offset. */
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/* */
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/* y_offset :: The vertical offset. */
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/* */
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/* <Note> */
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/* IMPORTANT: The x and y offsets are relative to the top corner of */
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/* the target bitmap (unlike the normal TrueType */
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/* convention). A positive y offset indicates a downwards */
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/* direction! */
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/* */
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static void
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blit_sbit( FT_Bitmap* target,
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FT_Byte* source,
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FT_Int line_bits,
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FT_Bool byte_padded,
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FT_Int x_offset,
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FT_Int y_offset )
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{
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FT_Byte* line_buff;
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FT_Int line_incr;
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FT_Int height;
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FT_UShort acc;
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FT_UInt loaded;
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/* first of all, compute starting write position */
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line_incr = target->pitch;
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line_buff = target->buffer;
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if ( line_incr < 0 )
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line_buff -= line_incr * ( target->rows - 1 );
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line_buff += ( x_offset >> 3 ) + y_offset * line_incr;
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/***********************************************************************/
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/* */
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/* We use the extra-classic `accumulator' trick to extract the bits */
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/* from the source byte stream. */
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/* */
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/* Namely, the variable `acc' is a 16-bit accumulator containing the */
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/* last `loaded' bits from the input stream. The bits are shifted to */
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/* the upmost position in `acc'. */
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/* */
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/***********************************************************************/
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acc = 0; /* clear accumulator */
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loaded = 0; /* no bits were loaded */
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for ( height = target->rows; height > 0; height-- )
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{
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FT_Byte* cur = line_buff; /* current write cursor */
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FT_Int count = line_bits; /* # of bits to extract per line */
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FT_Byte shift = (FT_Byte)( x_offset & 7 ); /* current write shift */
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FT_Byte space = (FT_Byte)( 8 - shift );
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/* first of all, read individual source bytes */
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if ( count >= 8 )
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{
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count -= 8;
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{
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do
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{
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FT_Byte val;
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/* ensure that there are at least 8 bits in the accumulator */
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if ( loaded < 8 )
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{
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acc |= (FT_UShort)((FT_UShort)*source++ << ( 8 - loaded ));
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loaded += 8;
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}
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/* now write one byte */
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val = (FT_Byte)( acc >> 8 );
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if ( shift )
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{
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cur[0] |= (FT_Byte)( val >> shift );
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cur[1] |= (FT_Byte)( val << space );
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}
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else
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cur[0] |= val;
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cur++;
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acc <<= 8; /* remove bits from accumulator */
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loaded -= 8;
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count -= 8;
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} while ( count >= 0 );
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}
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/* restore `count' to correct value */
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count += 8;
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}
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/* now write remaining bits (count < 8) */
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if ( count > 0 )
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{
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FT_Byte val;
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/* ensure that there are at least `count' bits in the accumulator */
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if ( (FT_Int)loaded < count )
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{
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acc |= (FT_UShort)((FT_UShort)*source++ << ( 8 - loaded ));
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loaded += 8;
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}
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/* now write remaining bits */
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val = (FT_Byte)( ( (FT_Byte)( acc >> 8 ) ) & ~( 0xFF >> count ) );
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cur[0] |= (FT_Byte)( val >> shift );
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if ( count > space )
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cur[1] |= (FT_Byte)( val << space );
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acc <<= count;
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loaded -= count;
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}
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/* now, skip to next line */
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if ( byte_padded )
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{
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acc = 0;
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loaded = 0; /* clear accumulator on byte-padded lines */
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}
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line_buff += line_incr;
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}
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}
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const FT_Frame_Field sbit_metrics_fields[] =
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{
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#undef FT_STRUCTURE
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#define FT_STRUCTURE TT_SBit_MetricsRec
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FT_FRAME_START( 8 ),
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FT_FRAME_BYTE( height ),
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FT_FRAME_BYTE( width ),
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FT_FRAME_CHAR( horiBearingX ),
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FT_FRAME_CHAR( horiBearingY ),
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FT_FRAME_BYTE( horiAdvance ),
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FT_FRAME_CHAR( vertBearingX ),
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FT_FRAME_CHAR( vertBearingY ),
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FT_FRAME_BYTE( vertAdvance ),
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FT_FRAME_END
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};
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/*************************************************************************/
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/* */
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/* <Function> */
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/* TT_Load_SBit_Const_Metrics */
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/* */
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/* <Description> */
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/* Loads the metrics for `EBLC' index tables format 2 and 5. */
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/* */
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/* <Input> */
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/* range :: The target range. */
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/* */
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/* stream :: The input stream. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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static FT_Error
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Load_SBit_Const_Metrics( TT_SBit_Range range,
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FT_Stream stream )
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{
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FT_Error error;
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if ( FT_READ_ULONG( range->image_size ) )
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return error;
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return FT_STREAM_READ_FIELDS( sbit_metrics_fields, &range->metrics );
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* TT_Load_SBit_Range_Codes */
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/* */
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/* <Description> */
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/* Loads the range codes for `EBLC' index tables format 4 and 5. */
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/* */
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/* <Input> */
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/* range :: The target range. */
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/* */
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/* stream :: The input stream. */
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/* */
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/* load_offsets :: A flag whether to load the glyph offset table. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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static FT_Error
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Load_SBit_Range_Codes( TT_SBit_Range range,
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FT_Stream stream,
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FT_Bool load_offsets )
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{
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FT_Error error;
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FT_ULong count, n, size;
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FT_Memory memory = stream->memory;
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if ( FT_READ_ULONG( count ) )
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goto Exit;
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range->num_glyphs = count;
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/* Allocate glyph offsets table if needed */
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if ( load_offsets )
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{
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if ( FT_NEW_ARRAY( range->glyph_offsets, count ) )
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goto Exit;
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size = count * 4L;
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}
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else
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size = count * 2L;
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/* Allocate glyph codes table and access frame */
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if ( FT_NEW_ARRAY ( range->glyph_codes, count ) ||
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FT_FRAME_ENTER( size ) )
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goto Exit;
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for ( n = 0; n < count; n++ )
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{
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range->glyph_codes[n] = FT_GET_USHORT();
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if ( load_offsets )
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range->glyph_offsets[n] = (FT_ULong)range->image_offset +
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FT_GET_USHORT();
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}
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FT_FRAME_EXIT();
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Exit:
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return error;
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* TT_Load_SBit_Range */
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/* */
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/* <Description> */
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/* Loads a given `EBLC' index/range table. */
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/* */
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/* <Input> */
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/* range :: The target range. */
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/* */
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/* stream :: The input stream. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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static FT_Error
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Load_SBit_Range( TT_SBit_Range range,
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FT_Stream stream )
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{
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FT_Error error;
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FT_Memory memory = stream->memory;
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switch( range->index_format )
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{
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case 1: /* variable metrics with 4-byte offsets */
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case 3: /* variable metrics with 2-byte offsets */
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{
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FT_ULong num_glyphs, n;
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FT_Int size_elem;
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FT_Bool large = FT_BOOL( range->index_format == 1 );
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num_glyphs = range->last_glyph - range->first_glyph + 1L;
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range->num_glyphs = num_glyphs;
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num_glyphs++; /* XXX: BEWARE - see spec */
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size_elem = large ? 4 : 2;
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if ( FT_NEW_ARRAY( range->glyph_offsets, num_glyphs ) ||
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FT_FRAME_ENTER( num_glyphs * size_elem ) )
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goto Exit;
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for ( n = 0; n < num_glyphs; n++ )
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range->glyph_offsets[n] = (FT_ULong)( range->image_offset +
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( large ? FT_GET_ULONG()
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: FT_GET_USHORT() ) );
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FT_FRAME_EXIT();
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}
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break;
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case 2: /* all glyphs have identical metrics */
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error = Load_SBit_Const_Metrics( range, stream );
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break;
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case 4:
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error = Load_SBit_Range_Codes( range, stream, 1 );
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break;
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case 5:
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error = Load_SBit_Const_Metrics( range, stream ) ||
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Load_SBit_Range_Codes( range, stream, 0 );
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break;
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default:
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error = SFNT_Err_Invalid_File_Format;
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}
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Exit:
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return error;
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* TT_Load_SBit_Strikes */
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/* */
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/* <Description> */
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/* Loads the table of embedded bitmap sizes for this face. */
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/* */
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/* <Input> */
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/* face :: The target face object. */
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/* */
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/* stream :: The input stream. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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FT_LOCAL_DEF( FT_Error )
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TT_Load_SBit_Strikes( TT_Face face,
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FT_Stream stream )
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{
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FT_Error error = 0;
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FT_Memory memory = stream->memory;
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FT_Fixed version;
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FT_ULong num_strikes;
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FT_ULong table_base;
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const FT_Frame_Field sbit_line_metrics_fields[] =
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{
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#undef FT_STRUCTURE
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#define FT_STRUCTURE TT_SBit_LineMetricsRec
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/* no FT_FRAME_START */
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FT_FRAME_CHAR( ascender ),
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FT_FRAME_CHAR( descender ),
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FT_FRAME_BYTE( max_width ),
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FT_FRAME_CHAR( caret_slope_numerator ),
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FT_FRAME_CHAR( caret_slope_denominator ),
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FT_FRAME_CHAR( caret_offset ),
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FT_FRAME_CHAR( min_origin_SB ),
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FT_FRAME_CHAR( min_advance_SB ),
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FT_FRAME_CHAR( max_before_BL ),
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FT_FRAME_CHAR( min_after_BL ),
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FT_FRAME_CHAR( pads[0] ),
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FT_FRAME_CHAR( pads[1] ),
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FT_FRAME_END
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};
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const FT_Frame_Field strike_start_fields[] =
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{
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#undef FT_STRUCTURE
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#define FT_STRUCTURE TT_SBit_StrikeRec
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/* no FT_FRAME_START */
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FT_FRAME_ULONG( ranges_offset ),
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FT_FRAME_SKIP_LONG,
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FT_FRAME_ULONG( num_ranges ),
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FT_FRAME_ULONG( color_ref ),
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FT_FRAME_END
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};
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const FT_Frame_Field strike_end_fields[] =
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{
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/* no FT_FRAME_START */
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FT_FRAME_USHORT( start_glyph ),
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FT_FRAME_USHORT( end_glyph ),
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FT_FRAME_BYTE ( x_ppem ),
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FT_FRAME_BYTE ( y_ppem ),
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FT_FRAME_BYTE ( bit_depth ),
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FT_FRAME_CHAR ( flags ),
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FT_FRAME_END
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};
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face->num_sbit_strikes = 0;
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/* this table is optional */
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error = face->goto_table( face, TTAG_EBLC, stream, 0 );
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if ( error )
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error = face->goto_table( face, TTAG_bloc, stream, 0 );
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if ( error )
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goto Exit;
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table_base = FT_STREAM_POS();
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if ( FT_FRAME_ENTER( 8L ) )
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goto Exit;
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version = FT_GET_LONG();
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num_strikes = FT_GET_ULONG();
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FT_FRAME_EXIT();
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|
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/* check version number and strike count */
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if ( version != 0x00020000L ||
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num_strikes >= 0x10000L )
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{
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FT_ERROR(( "TT_Load_SBit_Strikes: invalid table version!\n" ));
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error = SFNT_Err_Invalid_File_Format;
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goto Exit;
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}
|
|
|
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/* allocate the strikes table */
|
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if ( FT_NEW_ARRAY( face->sbit_strikes, num_strikes ) )
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goto Exit;
|
|
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face->num_sbit_strikes = num_strikes;
|
|
|
|
/* now read each strike table separately */
|
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{
|
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TT_SBit_Strike strike = face->sbit_strikes;
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FT_ULong count = num_strikes;
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|
|
|
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if ( FT_FRAME_ENTER( 48L * num_strikes ) )
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goto Exit;
|
|
|
|
while ( count > 0 )
|
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{
|
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if ( FT_STREAM_READ_FIELDS( strike_start_fields, strike ) ||
|
|
FT_STREAM_READ_FIELDS( sbit_line_metrics_fields, &strike->hori ) ||
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FT_STREAM_READ_FIELDS( sbit_line_metrics_fields, &strike->vert ) ||
|
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FT_STREAM_READ_FIELDS( strike_end_fields, strike ) )
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break;
|
|
|
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count--;
|
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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;
|
|
|
|
|
|
if ( FT_NEW_ARRAY( strike->sbit_ranges, strike->num_ranges ) )
|
|
goto Exit;
|
|
|
|
/* read each range */
|
|
if ( FT_STREAM_SEEK( table_base + strike->ranges_offset ) ||
|
|
FT_FRAME_ENTER( strike->num_ranges * 8L ) )
|
|
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;
|
|
}
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* TT_Free_SBit_Strikes */
|
|
/* */
|
|
/* <Description> */
|
|
/* Releases the embedded bitmap tables. */
|
|
/* */
|
|
/* <Input> */
|
|
/* face :: The target face object. */
|
|
/* */
|
|
FT_LOCAL_DEF( void )
|
|
TT_Free_SBit_Strikes( 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_Set_SBit_Strike( TT_Face face,
|
|
FT_Int x_ppem,
|
|
FT_Int y_ppem,
|
|
FT_ULong *astrike_index )
|
|
{
|
|
FT_Int i;
|
|
|
|
|
|
if ( x_ppem < 0 || x_ppem > 255 ||
|
|
y_ppem < 1 || y_ppem > 255 )
|
|
return SFNT_Err_Invalid_PPem;
|
|
|
|
for ( i = 0; i < face->num_sbit_strikes; i++ )
|
|
{
|
|
if ( ( face->sbit_strikes[i].y_ppem == y_ppem ) &&
|
|
( ( x_ppem == 0 ) ||
|
|
( face->sbit_strikes[i].x_ppem == x_ppem ) ) )
|
|
{
|
|
*astrike_index = i;
|
|
return SFNT_Err_Ok;
|
|
}
|
|
}
|
|
|
|
return SFNT_Err_Invalid_PPem;
|
|
}
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* Find_SBit_Range */
|
|
/* */
|
|
/* <Description> */
|
|
/* Scans a given strike's ranges and return, for a given glyph */
|
|
/* index, the corresponding sbit range, and `EBDT' offset. */
|
|
/* */
|
|
/* <Input> */
|
|
/* glyph_index :: The glyph index. */
|
|
/* */
|
|
/* strike :: The source/current sbit strike. */
|
|
/* */
|
|
/* <Output> */
|
|
/* arange :: The sbit range containing the glyph index. */
|
|
/* */
|
|
/* aglyph_offset :: The offset of the glyph data in `EBDT' table. */
|
|
/* */
|
|
/* <Return> */
|
|
/* 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 0;
|
|
}
|
|
}
|
|
|
|
Fail:
|
|
*arange = 0;
|
|
*aglyph_offset = 0;
|
|
|
|
return SFNT_Err_Invalid_Argument;
|
|
}
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* Find_SBit_Image */
|
|
/* */
|
|
/* <Description> */
|
|
/* Checks whether an embedded bitmap (an `sbit') exists for a given */
|
|
/* glyph, at a given strike. */
|
|
/* */
|
|
/* <Input> */
|
|
/* face :: The target face object. */
|
|
/* */
|
|
/* glyph_index :: The glyph index. */
|
|
/* */
|
|
/* strike_index :: The current strike index. */
|
|
/* */
|
|
/* <Output> */
|
|
/* 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. */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. Returns */
|
|
/* SFNT_Err_Invalid_Argument if no sbit exists for the requested */
|
|
/* glyph. */
|
|
/* */
|
|
static FT_Error
|
|
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 <= (FT_Int)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;
|
|
}
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* Load_SBit_Metrics */
|
|
/* */
|
|
/* <Description> */
|
|
/* Gets the big metrics for a given SBit. */
|
|
/* */
|
|
/* <Input> */
|
|
/* stream :: The input stream. */
|
|
/* */
|
|
/* range :: The SBit range containing the glyph. */
|
|
/* */
|
|
/* <Output> */
|
|
/* big_metrics :: A big SBit metrics structure for the glyph. */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. */
|
|
/* */
|
|
/* <Note> */
|
|
/* 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. */
|
|
/* */
|
|
static FT_Error
|
|
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;
|
|
|
|
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;
|
|
}
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* Crop_Bitmap */
|
|
/* */
|
|
/* <Description> */
|
|
/* Crops a bitmap to its tightest bounding box, and adjusts its */
|
|
/* metrics. */
|
|
/* */
|
|
/* <InOut> */
|
|
/* 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 );
|
|
|
|
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_Bitmap* map,
|
|
FT_Int x_offset,
|
|
FT_Int y_offset,
|
|
FT_Stream stream,
|
|
TT_SBit_Metrics metrics )
|
|
{
|
|
FT_Memory memory = stream->memory;
|
|
FT_Error error;
|
|
|
|
|
|
/* place stream at beginning of glyph data and read metrics */
|
|
if ( FT_STREAM_SEEK( ebdt_pos + glyph_offset ) )
|
|
goto Exit;
|
|
|
|
error = Load_SBit_Metrics( stream, range, metrics );
|
|
if ( error )
|
|
goto Exit;
|
|
|
|
/* this function is recursive. At the top-level call, the */
|
|
/* field map.buffer is NULL. We thus begin by finding the */
|
|
/* dimensions of the higher-level glyph to allocate the */
|
|
/* final pixmap buffer */
|
|
if ( map->buffer == 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_pal2;
|
|
map->pitch = ( map->width + 3 ) >> 2;
|
|
break;
|
|
|
|
case 4:
|
|
map->pixel_mode = ft_pixel_mode_pal4;
|
|
map->pitch = ( map->width + 1 ) >> 1;
|
|
break;
|
|
|
|
case 8:
|
|
map->pixel_mode = ft_pixel_mode_grays;
|
|
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! */
|
|
|
|
if ( FT_ALLOC( map->buffer, size ) )
|
|
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 */
|
|
FT_Stream_Skip( stream, 1L );
|
|
/* 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,
|
|
map,
|
|
x_offset + comp->x_offset,
|
|
y_offset + comp->y_offset,
|
|
stream,
|
|
&elem_metrics );
|
|
if ( error )
|
|
goto Fail_Memory;
|
|
}
|
|
|
|
Fail_Memory:
|
|
FT_FREE( components );
|
|
}
|
|
|
|
Exit:
|
|
return error;
|
|
}
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* TT_Load_SBit_Image */
|
|
/* */
|
|
/* <Description> */
|
|
/* Loads a given glyph sbit image from the font resource. This also */
|
|
/* returns its metrics. */
|
|
/* */
|
|
/* <Input> */
|
|
/* 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. */
|
|
/* */
|
|
/* <Output> */
|
|
/* map :: The target pixmap. */
|
|
/* */
|
|
/* metrics :: A big sbit metrics structure for the glyph image. */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. Returns an error if no */
|
|
/* glyph sbit exists for the index. */
|
|
/* */
|
|
/* <Note> */
|
|
/* The `map.buffer' field is always freed before the glyph is loaded. */
|
|
/* */
|
|
FT_LOCAL_DEF( FT_Error )
|
|
TT_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_Memory memory = stream->memory;
|
|
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 = 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();
|
|
|
|
/* clear the bitmap & load the bitmap */
|
|
if ( face->root.glyph->flags & FT_GLYPH_OWN_BITMAP )
|
|
FT_FREE( map->buffer );
|
|
|
|
map->rows = map->pitch = map->width = 0;
|
|
|
|
error = Load_SBit_Image( strike, range, ebdt_pos, glyph_offset,
|
|
map, 0, 0, stream, metrics );
|
|
if ( error )
|
|
goto Exit;
|
|
|
|
/* the glyph slot owns this bitmap buffer */
|
|
face->root.glyph->flags |= FT_GLYPH_OWN_BITMAP;
|
|
|
|
/* 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 / 10 );
|
|
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;
|
|
}
|
|
|
|
|
|
/* END */
|