| /**************************************************************************** |
| * |
| * pshints.c |
| * |
| * Adobe's code for handling CFF hints (body). |
| * |
| * Copyright 2007-2014 Adobe Systems Incorporated. |
| * |
| * This software, and all works of authorship, whether in source or |
| * object code form as indicated by the copyright notice(s) included |
| * herein (collectively, the "Work") is made available, and may only be |
| * used, modified, and distributed under the FreeType Project License, |
| * LICENSE.TXT. Additionally, subject to the terms and conditions of the |
| * FreeType Project License, each contributor to the Work hereby grants |
| * to any individual or legal entity exercising permissions granted by |
| * the FreeType Project License and this section (hereafter, "You" or |
| * "Your") a perpetual, worldwide, non-exclusive, no-charge, |
| * royalty-free, irrevocable (except as stated in this section) patent |
| * license to make, have made, use, offer to sell, sell, import, and |
| * otherwise transfer the Work, where such license applies only to those |
| * patent claims licensable by such contributor that are necessarily |
| * infringed by their contribution(s) alone or by combination of their |
| * contribution(s) with the Work to which such contribution(s) was |
| * submitted. If You institute patent litigation against any entity |
| * (including a cross-claim or counterclaim in a lawsuit) alleging that |
| * the Work or a contribution incorporated within the Work constitutes |
| * direct or contributory patent infringement, then any patent licenses |
| * granted to You under this License for that Work shall terminate as of |
| * the date such litigation is filed. |
| * |
| * By using, modifying, or distributing the Work you indicate that you |
| * have read and understood the terms and conditions of the |
| * FreeType Project License as well as those provided in this section, |
| * and you accept them fully. |
| * |
| */ |
| |
| |
| #include "psft.h" |
| #include <freetype/internal/ftdebug.h> |
| |
| #include "psglue.h" |
| #include "psfont.h" |
| #include "pshints.h" |
| #include "psintrp.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 cf2hints |
| |
| |
| typedef struct CF2_HintMoveRec_ |
| { |
| size_t j; /* index of upper hint map edge */ |
| CF2_Fixed moveUp; /* adjustment to optimum position */ |
| |
| } CF2_HintMoveRec, *CF2_HintMove; |
| |
| |
| /* Compute angular momentum for winding order detection. It is called */ |
| /* for all lines and curves, but not necessarily in element order. */ |
| static CF2_Int |
| cf2_getWindingMomentum( CF2_Fixed x1, |
| CF2_Fixed y1, |
| CF2_Fixed x2, |
| CF2_Fixed y2 ) |
| { |
| /* cross product of pt1 position from origin with pt2 position from */ |
| /* pt1; we reduce the precision so that the result fits into 32 bits */ |
| |
| return ( x1 >> 16 ) * ( SUB_INT32( y2, y1 ) >> 16 ) - |
| ( y1 >> 16 ) * ( SUB_INT32( x2, x1 ) >> 16 ); |
| } |
| |
| |
| /* |
| * Construct from a StemHint; this is used as a parameter to |
| * `cf2_blues_capture'. |
| * `hintOrigin' is the character space displacement of a seac accent. |
| * Adjust stem hint for darkening here. |
| * |
| */ |
| static void |
| cf2_hint_init( CF2_Hint hint, |
| const CF2_ArrStack stemHintArray, |
| size_t indexStemHint, |
| const CF2_Font font, |
| CF2_Fixed hintOrigin, |
| CF2_Fixed scale, |
| FT_Bool bottom ) |
| { |
| CF2_Fixed width; |
| const CF2_StemHintRec* stemHint; |
| |
| |
| FT_ZERO( hint ); |
| |
| stemHint = (const CF2_StemHintRec*)cf2_arrstack_getPointer( |
| stemHintArray, |
| indexStemHint ); |
| |
| width = SUB_INT32( stemHint->max, stemHint->min ); |
| |
| if ( width == cf2_intToFixed( -21 ) ) |
| { |
| /* ghost bottom */ |
| |
| if ( bottom ) |
| { |
| hint->csCoord = stemHint->max; |
| hint->flags = CF2_GhostBottom; |
| } |
| else |
| hint->flags = 0; |
| } |
| |
| else if ( width == cf2_intToFixed( -20 ) ) |
| { |
| /* ghost top */ |
| |
| if ( bottom ) |
| hint->flags = 0; |
| else |
| { |
| hint->csCoord = stemHint->min; |
| hint->flags = CF2_GhostTop; |
| } |
| } |
| |
| else if ( width < 0 ) |
| { |
| /* inverted pair */ |
| |
| /* |
| * Hints with negative widths were produced by an early version of a |
| * non-Adobe font tool. The Type 2 spec allows edge (ghost) hints |
| * with negative widths, but says |
| * |
| * All other negative widths have undefined meaning. |
| * |
| * CoolType has a silent workaround that negates the hint width; for |
| * permissive mode, we do the same here. |
| * |
| * Note: Such fonts cannot use ghost hints, but should otherwise work. |
| * Note: Some poor hints in our faux fonts can produce negative |
| * widths at some blends. For example, see a light weight of |
| * `u' in ASerifMM. |
| * |
| */ |
| if ( bottom ) |
| { |
| hint->csCoord = stemHint->max; |
| hint->flags = CF2_PairBottom; |
| } |
| else |
| { |
| hint->csCoord = stemHint->min; |
| hint->flags = CF2_PairTop; |
| } |
| } |
| |
| else |
| { |
| /* normal pair */ |
| |
| if ( bottom ) |
| { |
| hint->csCoord = stemHint->min; |
| hint->flags = CF2_PairBottom; |
| } |
| else |
| { |
| hint->csCoord = stemHint->max; |
| hint->flags = CF2_PairTop; |
| } |
| } |
| |
| /* Now that ghost hints have been detected, adjust this edge for */ |
| /* darkening. Bottoms are not changed; tops are incremented by twice */ |
| /* `darkenY'. */ |
| if ( cf2_hint_isTop( hint ) ) |
| hint->csCoord = ADD_INT32( hint->csCoord, 2 * font->darkenY ); |
| |
| hint->csCoord = ADD_INT32( hint->csCoord, hintOrigin ); |
| hint->scale = scale; |
| hint->index = indexStemHint; /* index in original stem hint array */ |
| |
| /* if original stem hint has been used, use the same position */ |
| if ( hint->flags != 0 && stemHint->used ) |
| { |
| if ( cf2_hint_isTop( hint ) ) |
| hint->dsCoord = stemHint->maxDS; |
| else |
| hint->dsCoord = stemHint->minDS; |
| |
| cf2_hint_lock( hint ); |
| } |
| else |
| hint->dsCoord = FT_MulFix( hint->csCoord, scale ); |
| } |
| |
| |
| /* initialize an invalid hint map element */ |
| static void |
| cf2_hint_initZero( CF2_Hint hint ) |
| { |
| FT_ZERO( hint ); |
| } |
| |
| |
| FT_LOCAL_DEF( FT_Bool ) |
| cf2_hint_isValid( const CF2_Hint hint ) |
| { |
| return FT_BOOL( hint->flags ); |
| } |
| |
| |
| static FT_Bool |
| cf2_hint_isPair( const CF2_Hint hint ) |
| { |
| return FT_BOOL( hint->flags & ( CF2_PairBottom | CF2_PairTop ) ); |
| } |
| |
| |
| static FT_Bool |
| cf2_hint_isPairTop( const CF2_Hint hint ) |
| { |
| return FT_BOOL( hint->flags & CF2_PairTop ); |
| } |
| |
| |
| FT_LOCAL_DEF( FT_Bool ) |
| cf2_hint_isTop( const CF2_Hint hint ) |
| { |
| return FT_BOOL( hint->flags & ( CF2_PairTop | CF2_GhostTop ) ); |
| } |
| |
| |
| FT_LOCAL_DEF( FT_Bool ) |
| cf2_hint_isBottom( const CF2_Hint hint ) |
| { |
| return FT_BOOL( hint->flags & ( CF2_PairBottom | CF2_GhostBottom ) ); |
| } |
| |
| |
| static FT_Bool |
| cf2_hint_isLocked( const CF2_Hint hint ) |
| { |
| return FT_BOOL( hint->flags & CF2_Locked ); |
| } |
| |
| |
| static FT_Bool |
| cf2_hint_isSynthetic( const CF2_Hint hint ) |
| { |
| return FT_BOOL( hint->flags & CF2_Synthetic ); |
| } |
| |
| |
| FT_LOCAL_DEF( void ) |
| cf2_hint_lock( CF2_Hint hint ) |
| { |
| hint->flags |= CF2_Locked; |
| } |
| |
| |
| FT_LOCAL_DEF( void ) |
| cf2_hintmap_init( CF2_HintMap hintmap, |
| CF2_Font font, |
| CF2_HintMap initialMap, |
| CF2_ArrStack hintMoves, |
| CF2_Fixed scale ) |
| { |
| FT_ZERO( hintmap ); |
| |
| /* copy parameters from font instance */ |
| hintmap->hinted = font->hinted; |
| hintmap->scale = scale; |
| hintmap->font = font; |
| hintmap->initialHintMap = initialMap; |
| /* will clear in `cf2_hintmap_adjustHints' */ |
| hintmap->hintMoves = hintMoves; |
| } |
| |
| |
| static FT_Bool |
| cf2_hintmap_isValid( const CF2_HintMap hintmap ) |
| { |
| return hintmap->isValid; |
| } |
| |
| |
| static void |
| cf2_hintmap_dump( CF2_HintMap hintmap ) |
| { |
| #ifdef FT_DEBUG_LEVEL_TRACE |
| CF2_UInt i; |
| |
| |
| FT_TRACE6(( " index csCoord dsCoord scale flags\n" )); |
| |
| for ( i = 0; i < hintmap->count; i++ ) |
| { |
| CF2_Hint hint = &hintmap->edge[i]; |
| |
| |
| FT_TRACE6(( " %3ld %7.2f %7.2f %5d %s%s%s%s\n", |
| hint->index, |
| hint->csCoord / 65536.0, |
| hint->dsCoord / ( hint->scale * 1.0 ), |
| hint->scale, |
| ( cf2_hint_isPair( hint ) ? "p" : "g" ), |
| ( cf2_hint_isTop( hint ) ? "t" : "b" ), |
| ( cf2_hint_isLocked( hint ) ? "L" : ""), |
| ( cf2_hint_isSynthetic( hint ) ? "S" : "" ) )); |
| } |
| #else |
| FT_UNUSED( hintmap ); |
| #endif |
| } |
| |
| |
| /* transform character space coordinate to device space using hint map */ |
| static CF2_Fixed |
| cf2_hintmap_map( CF2_HintMap hintmap, |
| CF2_Fixed csCoord ) |
| { |
| if ( hintmap->count == 0 || !hintmap->hinted ) |
| { |
| /* there are no hints; use uniform scale and zero offset */ |
| return FT_MulFix( csCoord, hintmap->scale ); |
| } |
| else |
| { |
| /* start linear search from last hit */ |
| CF2_UInt i = hintmap->lastIndex; |
| |
| |
| FT_ASSERT( hintmap->lastIndex < CF2_MAX_HINT_EDGES ); |
| |
| /* search up */ |
| while ( i < hintmap->count - 1 && |
| csCoord >= hintmap->edge[i + 1].csCoord ) |
| i += 1; |
| |
| /* search down */ |
| while ( i > 0 && csCoord < hintmap->edge[i].csCoord ) |
| i -= 1; |
| |
| hintmap->lastIndex = i; |
| |
| if ( i == 0 && csCoord < hintmap->edge[0].csCoord ) |
| { |
| /* special case for points below first edge: use uniform scale */ |
| return ADD_INT32( FT_MulFix( SUB_INT32( csCoord, |
| hintmap->edge[0].csCoord ), |
| hintmap->scale ), |
| hintmap->edge[0].dsCoord ); |
| } |
| else |
| { |
| /* |
| * Note: entries with duplicate csCoord are allowed. |
| * Use edge[i], the highest entry where csCoord >= entry[i].csCoord |
| */ |
| return ADD_INT32( FT_MulFix( SUB_INT32( csCoord, |
| hintmap->edge[i].csCoord ), |
| hintmap->edge[i].scale ), |
| hintmap->edge[i].dsCoord ); |
| } |
| } |
| } |
| |
| |
| /* |
| * This hinting policy moves a hint pair in device space so that one of |
| * its two edges is on a device pixel boundary (its fractional part is |
| * zero). `cf2_hintmap_insertHint' guarantees no overlap in CS |
| * space. Ensure here that there is no overlap in DS. |
| * |
| * In the first pass, edges are adjusted relative to adjacent hints. |
| * Those that are below have already been adjusted. Those that are |
| * above have not yet been adjusted. If a hint above blocks an |
| * adjustment to an optimal position, we will try again in a second |
| * pass. The second pass is top-down. |
| * |
| */ |
| |
| static void |
| cf2_hintmap_adjustHints( CF2_HintMap hintmap ) |
| { |
| size_t i, j; |
| |
| |
| cf2_arrstack_clear( hintmap->hintMoves ); /* working storage */ |
| |
| /* |
| * First pass is bottom-up (font hint order) without look-ahead. |
| * Locked edges are already adjusted. |
| * Unlocked edges begin with dsCoord from `initialHintMap'. |
| * Save edges that are not optimally adjusted in `hintMoves' array, |
| * and process them in second pass. |
| */ |
| |
| for ( i = 0; i < hintmap->count; i++ ) |
| { |
| FT_Bool isPair = cf2_hint_isPair( &hintmap->edge[i] ); |
| |
| /* final amount to move edge or edge pair */ |
| CF2_Fixed move = 0; |
| |
| CF2_Fixed dsCoord_i; |
| CF2_Fixed dsCoord_j; |
| |
| |
| /* index of upper edge (same value for ghost hint) */ |
| j = isPair ? i + 1 : i; |
| |
| FT_ASSERT( j < hintmap->count ); |
| FT_ASSERT( cf2_hint_isValid( &hintmap->edge[i] ) ); |
| FT_ASSERT( cf2_hint_isValid( &hintmap->edge[j] ) ); |
| FT_ASSERT( cf2_hint_isLocked( &hintmap->edge[i] ) == |
| cf2_hint_isLocked( &hintmap->edge[j] ) ); |
| |
| dsCoord_i = hintmap->edge[i].dsCoord; |
| dsCoord_j = hintmap->edge[j].dsCoord; |
| |
| if ( !cf2_hint_isLocked( &hintmap->edge[i] ) ) |
| { |
| /* hint edge is not locked, we can adjust it */ |
| CF2_Fixed fracDown = cf2_fixedFraction( dsCoord_i ); |
| CF2_Fixed fracUp = cf2_fixedFraction( dsCoord_j ); |
| |
| /* calculate all four possibilities; moves down are negative */ |
| CF2_Fixed downMoveDown = 0 - fracDown; |
| CF2_Fixed upMoveDown = 0 - fracUp; |
| CF2_Fixed downMoveUp = ( fracDown == 0 ) |
| ? 0 |
| : cf2_intToFixed( 1 ) - fracDown; |
| CF2_Fixed upMoveUp = ( fracUp == 0 ) |
| ? 0 |
| : cf2_intToFixed( 1 ) - fracUp; |
| |
| /* smallest move up */ |
| CF2_Fixed moveUp = FT_MIN( downMoveUp, upMoveUp ); |
| /* smallest move down */ |
| CF2_Fixed moveDown = FT_MAX( downMoveDown, upMoveDown ); |
| |
| CF2_Fixed downMinCounter = CF2_MIN_COUNTER; |
| CF2_Fixed upMinCounter = CF2_MIN_COUNTER; |
| FT_Bool saveEdge = FALSE; |
| |
| |
| /* minimum counter constraint doesn't apply when adjacent edges */ |
| /* are synthetic */ |
| /* TODO: doesn't seem a big effect; for now, reduce the code */ |
| #if 0 |
| if ( i == 0 || |
| cf2_hint_isSynthetic( &hintmap->edge[i - 1] ) ) |
| downMinCounter = 0; |
| |
| if ( j >= hintmap->count - 1 || |
| cf2_hint_isSynthetic( &hintmap->edge[j + 1] ) ) |
| upMinCounter = 0; |
| #endif |
| |
| /* is there room to move up? */ |
| /* there is if we are at top of array or the next edge is at or */ |
| /* beyond proposed move up? */ |
| if ( j >= hintmap->count - 1 || |
| hintmap->edge[j + 1].dsCoord >= |
| ADD_INT32( dsCoord_j, moveUp + upMinCounter ) ) |
| { |
| /* there is room to move up; is there also room to move down? */ |
| if ( i == 0 || |
| hintmap->edge[i - 1].dsCoord <= |
| ADD_INT32( dsCoord_i, moveDown - downMinCounter ) ) |
| { |
| /* move smaller absolute amount */ |
| move = ( -moveDown < moveUp ) ? moveDown : moveUp; /* optimum */ |
| } |
| else |
| move = moveUp; |
| } |
| else |
| { |
| /* is there room to move down? */ |
| if ( i == 0 || |
| hintmap->edge[i - 1].dsCoord <= |
| ADD_INT32( dsCoord_i, moveDown - downMinCounter ) ) |
| { |
| move = moveDown; |
| /* true if non-optimum move */ |
| saveEdge = FT_BOOL( moveUp < -moveDown ); |
| } |
| else |
| { |
| /* no room to move either way without overlapping or reducing */ |
| /* the counter too much */ |
| move = 0; |
| saveEdge = TRUE; |
| } |
| } |
| |
| /* Identify non-moves and moves down that aren't optimal, and save */ |
| /* them for second pass. */ |
| /* Do this only if there is an unlocked edge above (which could */ |
| /* possibly move). */ |
| if ( saveEdge && |
| j < hintmap->count - 1 && |
| !cf2_hint_isLocked( &hintmap->edge[j + 1] ) ) |
| { |
| CF2_HintMoveRec savedMove; |
| |
| |
| savedMove.j = j; |
| /* desired adjustment in second pass */ |
| savedMove.moveUp = moveUp - move; |
| |
| cf2_arrstack_push( hintmap->hintMoves, &savedMove ); |
| } |
| |
| /* move the edge(s) */ |
| hintmap->edge[i].dsCoord = ADD_INT32( dsCoord_i, move ); |
| if ( isPair ) |
| hintmap->edge[j].dsCoord = ADD_INT32( dsCoord_j, move ); |
| } |
| |
| /* assert there are no overlaps in device space; */ |
| /* ignore tests if there was overflow (that is, if */ |
| /* operands have the same sign but the sum does not) */ |
| FT_ASSERT( i == 0 || |
| ( ( dsCoord_i ^ move ) >= 0 && |
| ( dsCoord_i ^ hintmap->edge[i].dsCoord ) < 0 ) || |
| hintmap->edge[i - 1].dsCoord <= hintmap->edge[i].dsCoord ); |
| FT_ASSERT( i < j || |
| ( ( dsCoord_j ^ move ) >= 0 && |
| ( dsCoord_j ^ hintmap->edge[j].dsCoord ) < 0 ) || |
| hintmap->edge[i].dsCoord <= hintmap->edge[j].dsCoord ); |
| |
| /* adjust the scales, avoiding divide by zero */ |
| if ( i > 0 ) |
| { |
| if ( hintmap->edge[i].csCoord != hintmap->edge[i - 1].csCoord ) |
| hintmap->edge[i - 1].scale = |
| FT_DivFix( SUB_INT32( hintmap->edge[i].dsCoord, |
| hintmap->edge[i - 1].dsCoord ), |
| SUB_INT32( hintmap->edge[i].csCoord, |
| hintmap->edge[i - 1].csCoord ) ); |
| } |
| |
| if ( isPair ) |
| { |
| if ( hintmap->edge[j].csCoord != hintmap->edge[j - 1].csCoord ) |
| hintmap->edge[j - 1].scale = |
| FT_DivFix( SUB_INT32( hintmap->edge[j].dsCoord, |
| hintmap->edge[j - 1].dsCoord ), |
| SUB_INT32( hintmap->edge[j].csCoord, |
| hintmap->edge[j - 1].csCoord ) ); |
| |
| i += 1; /* skip upper edge on next loop */ |
| } |
| } |
| |
| /* second pass tries to move non-optimal hints up, in case there is */ |
| /* room now */ |
| for ( i = cf2_arrstack_size( hintmap->hintMoves ); i > 0; i-- ) |
| { |
| CF2_HintMove hintMove = (CF2_HintMove) |
| cf2_arrstack_getPointer( hintmap->hintMoves, i - 1 ); |
| |
| |
| j = hintMove->j; |
| |
| /* this was tested before the push, above */ |
| FT_ASSERT( j < hintmap->count - 1 ); |
| |
| /* is there room to move up? */ |
| if ( hintmap->edge[j + 1].dsCoord >= |
| ADD_INT32( hintmap->edge[j].dsCoord, |
| hintMove->moveUp + CF2_MIN_COUNTER ) ) |
| { |
| /* there is more room now, move edge up */ |
| hintmap->edge[j].dsCoord = ADD_INT32( hintmap->edge[j].dsCoord, |
| hintMove->moveUp ); |
| |
| if ( cf2_hint_isPair( &hintmap->edge[j] ) ) |
| { |
| FT_ASSERT( j > 0 ); |
| hintmap->edge[j - 1].dsCoord = |
| ADD_INT32( hintmap->edge[j - 1].dsCoord, hintMove->moveUp ); |
| } |
| } |
| } |
| } |
| |
| |
| /* insert hint edges into map, sorted by csCoord */ |
| static void |
| cf2_hintmap_insertHint( CF2_HintMap hintmap, |
| CF2_Hint bottomHintEdge, |
| CF2_Hint topHintEdge ) |
| { |
| CF2_UInt indexInsert; |
| |
| /* set default values, then check for edge hints */ |
| FT_Bool isPair = TRUE; |
| CF2_Hint firstHintEdge = bottomHintEdge; |
| CF2_Hint secondHintEdge = topHintEdge; |
| |
| |
| /* one or none of the input params may be invalid when dealing with */ |
| /* edge hints; at least one edge must be valid */ |
| FT_ASSERT( cf2_hint_isValid( bottomHintEdge ) || |
| cf2_hint_isValid( topHintEdge ) ); |
| |
| /* determine how many and which edges to insert */ |
| if ( !cf2_hint_isValid( bottomHintEdge ) ) |
| { |
| /* insert only the top edge */ |
| firstHintEdge = topHintEdge; |
| isPair = FALSE; |
| } |
| else if ( !cf2_hint_isValid( topHintEdge ) ) |
| { |
| /* insert only the bottom edge */ |
| isPair = FALSE; |
| } |
| |
| /* paired edges must be in proper order */ |
| if ( isPair && |
| topHintEdge->csCoord < bottomHintEdge->csCoord ) |
| return; |
| |
| /* linear search to find index value of insertion point */ |
| indexInsert = 0; |
| for ( ; indexInsert < hintmap->count; indexInsert++ ) |
| { |
| if ( hintmap->edge[indexInsert].csCoord >= firstHintEdge->csCoord ) |
| break; |
| } |
| |
| FT_TRACE7(( " Got hint at %.2f (%.2f)\n", |
| firstHintEdge->csCoord / 65536.0, |
| firstHintEdge->dsCoord / 65536.0 )); |
| if ( isPair ) |
| FT_TRACE7(( " Got hint at %.2f (%.2f)\n", |
| secondHintEdge->csCoord / 65536.0, |
| secondHintEdge->dsCoord / 65536.0 )); |
| |
| /* |
| * Discard any hints that overlap in character space. Most often, this |
| * is while building the initial map, where captured hints from all |
| * zones are combined. Define overlap to include hints that `touch' |
| * (overlap zero). Hiragino Sans/Gothic fonts have numerous hints that |
| * touch. Some fonts have non-ideographic glyphs that overlap our |
| * synthetic hints. |
| * |
| * Overlap also occurs when darkening stem hints that are close. |
| * |
| */ |
| if ( indexInsert < hintmap->count ) |
| { |
| /* we are inserting before an existing edge: */ |
| /* verify that an existing edge is not the same */ |
| if ( hintmap->edge[indexInsert].csCoord == firstHintEdge->csCoord ) |
| return; /* ignore overlapping stem hint */ |
| |
| /* verify that a new pair does not straddle the next edge */ |
| if ( isPair && |
| hintmap->edge[indexInsert].csCoord <= secondHintEdge->csCoord ) |
| return; /* ignore overlapping stem hint */ |
| |
| /* verify that we are not inserting between paired edges */ |
| if ( cf2_hint_isPairTop( &hintmap->edge[indexInsert] ) ) |
| return; /* ignore overlapping stem hint */ |
| } |
| |
| /* recompute device space locations using initial hint map */ |
| if ( cf2_hintmap_isValid( hintmap->initialHintMap ) && |
| !cf2_hint_isLocked( firstHintEdge ) ) |
| { |
| if ( isPair ) |
| { |
| /* Use hint map to position the center of stem, and nominal scale */ |
| /* to position the two edges. This preserves the stem width. */ |
| CF2_Fixed midpoint = |
| cf2_hintmap_map( |
| hintmap->initialHintMap, |
| ADD_INT32( |
| firstHintEdge->csCoord, |
| SUB_INT32 ( secondHintEdge->csCoord, |
| firstHintEdge->csCoord ) / 2 ) ); |
| CF2_Fixed halfWidth = |
| FT_MulFix( SUB_INT32( secondHintEdge->csCoord, |
| firstHintEdge->csCoord ) / 2, |
| hintmap->scale ); |
| |
| |
| firstHintEdge->dsCoord = SUB_INT32( midpoint, halfWidth ); |
| secondHintEdge->dsCoord = ADD_INT32( midpoint, halfWidth ); |
| } |
| else |
| firstHintEdge->dsCoord = cf2_hintmap_map( hintmap->initialHintMap, |
| firstHintEdge->csCoord ); |
| } |
| |
| /* |
| * Discard any hints that overlap in device space; this can occur |
| * because locked hints have been moved to align with blue zones. |
| * |
| * TODO: Although we might correct this later during adjustment, we |
| * don't currently have a way to delete a conflicting hint once it has |
| * been inserted. See v2.030 MinionPro-Regular, 12 ppem darkened, |
| * initial hint map for second path, glyph 945 (the perispomeni (tilde) |
| * in U+1F6E, Greek omega with psili and perispomeni). Darkening is |
| * 25. Pair 667,747 initially conflicts in design space with top edge |
| * 660. This is because 667 maps to 7.87, and the top edge was |
| * captured by a zone at 8.0. The pair is later successfully inserted |
| * in a zone without the top edge. In this zone it is adjusted to 8.0, |
| * and no longer conflicts with the top edge in design space. This |
| * means it can be included in yet a later zone which does have the top |
| * edge hint. This produces a small mismatch between the first and |
| * last points of this path, even though the hint masks are the same. |
| * The density map difference is tiny (1/256). |
| * |
| */ |
| |
| if ( indexInsert > 0 ) |
| { |
| /* we are inserting after an existing edge */ |
| if ( firstHintEdge->dsCoord < hintmap->edge[indexInsert - 1].dsCoord ) |
| return; |
| } |
| |
| if ( indexInsert < hintmap->count ) |
| { |
| /* we are inserting before an existing edge */ |
| if ( isPair ) |
| { |
| if ( secondHintEdge->dsCoord > hintmap->edge[indexInsert].dsCoord ) |
| return; |
| } |
| else |
| { |
| if ( firstHintEdge->dsCoord > hintmap->edge[indexInsert].dsCoord ) |
| return; |
| } |
| } |
| |
| /* make room to insert */ |
| { |
| CF2_UInt iSrc = hintmap->count - 1; |
| CF2_UInt iDst = isPair ? hintmap->count + 1 : hintmap->count; |
| |
| CF2_UInt count = hintmap->count - indexInsert; |
| |
| |
| if ( iDst >= CF2_MAX_HINT_EDGES ) |
| { |
| FT_TRACE4(( "cf2_hintmap_insertHint: too many hintmaps\n" )); |
| return; |
| } |
| |
| while ( count-- ) |
| hintmap->edge[iDst--] = hintmap->edge[iSrc--]; |
| |
| /* insert first edge */ |
| hintmap->edge[indexInsert] = *firstHintEdge; /* copy struct */ |
| hintmap->count += 1; |
| |
| FT_TRACE7(( " Inserting hint %.2f (%.2f)\n", |
| firstHintEdge->csCoord / 65536.0, |
| firstHintEdge->dsCoord / 65536.0 )); |
| |
| if ( isPair ) |
| { |
| /* insert second edge */ |
| hintmap->edge[indexInsert + 1] = *secondHintEdge; /* copy struct */ |
| hintmap->count += 1; |
| |
| FT_TRACE7(( " Inserting hint %.2f (%.2f)\n", |
| secondHintEdge->csCoord / 65536.0, |
| secondHintEdge->dsCoord / 65536.0 )); |
| |
| } |
| } |
| |
| return; |
| } |
| |
| |
| /* |
| * Build a map from hints and mask. |
| * |
| * This function may recur one level if `hintmap->initialHintMap' is not yet |
| * valid. |
| * If `initialMap' is true, simply build initial map. |
| * |
| * Synthetic hints are used in two ways. A hint at zero is inserted, if |
| * needed, in the initial hint map, to prevent translations from |
| * propagating across the origin. If synthetic em box hints are enabled |
| * for ideographic dictionaries, then they are inserted in all hint |
| * maps, including the initial one. |
| * |
| */ |
| FT_LOCAL_DEF( void ) |
| cf2_hintmap_build( CF2_HintMap hintmap, |
| CF2_ArrStack hStemHintArray, |
| CF2_ArrStack vStemHintArray, |
| CF2_HintMask hintMask, |
| CF2_Fixed hintOrigin, |
| FT_Bool initialMap ) |
| { |
| FT_Byte* maskPtr; |
| |
| CF2_Font font = hintmap->font; |
| CF2_HintMaskRec tempHintMask; |
| |
| size_t bitCount, i; |
| FT_Byte maskByte; |
| |
| |
| /* check whether initial map is constructed */ |
| if ( !initialMap && !cf2_hintmap_isValid( hintmap->initialHintMap ) ) |
| { |
| /* make recursive call with initialHintMap and temporary mask; */ |
| /* temporary mask will get all bits set, below */ |
| cf2_hintmask_init( &tempHintMask, hintMask->error ); |
| cf2_hintmap_build( hintmap->initialHintMap, |
| hStemHintArray, |
| vStemHintArray, |
| &tempHintMask, |
| hintOrigin, |
| TRUE ); |
| } |
| |
| if ( !cf2_hintmask_isValid( hintMask ) ) |
| { |
| /* without a hint mask, assume all hints are active */ |
| cf2_hintmask_setAll( hintMask, |
| cf2_arrstack_size( hStemHintArray ) + |
| cf2_arrstack_size( vStemHintArray ) ); |
| if ( !cf2_hintmask_isValid( hintMask ) ) |
| { |
| if ( font->isT1 ) |
| { |
| /* no error, just continue unhinted */ |
| *hintMask->error = FT_Err_Ok; |
| hintmap->hinted = FALSE; |
| } |
| return; /* too many stem hints */ |
| } |
| } |
| |
| /* begin by clearing the map */ |
| hintmap->count = 0; |
| hintmap->lastIndex = 0; |
| |
| /* make a copy of the hint mask so we can modify it */ |
| tempHintMask = *hintMask; |
| maskPtr = cf2_hintmask_getMaskPtr( &tempHintMask ); |
| |
| /* use the hStem hints only, which are first in the mask */ |
| bitCount = cf2_arrstack_size( hStemHintArray ); |
| |
| /* Defense-in-depth. Should never return here. */ |
| if ( bitCount > hintMask->bitCount ) |
| return; |
| |
| /* synthetic embox hints get highest priority */ |
| if ( font->blues.doEmBoxHints ) |
| { |
| CF2_HintRec dummy; |
| |
| |
| cf2_hint_initZero( &dummy ); /* invalid hint map element */ |
| |
| /* ghost bottom */ |
| cf2_hintmap_insertHint( hintmap, |
| &font->blues.emBoxBottomEdge, |
| &dummy ); |
| /* ghost top */ |
| cf2_hintmap_insertHint( hintmap, |
| &dummy, |
| &font->blues.emBoxTopEdge ); |
| } |
| |
| /* insert hints captured by a blue zone or already locked (higher */ |
| /* priority) */ |
| for ( i = 0, maskByte = 0x80; i < bitCount; i++ ) |
| { |
| if ( maskByte & *maskPtr ) |
| { |
| /* expand StemHint into two `CF2_Hint' elements */ |
| CF2_HintRec bottomHintEdge, topHintEdge; |
| |
| |
| cf2_hint_init( &bottomHintEdge, |
| hStemHintArray, |
| i, |
| font, |
| hintOrigin, |
| hintmap->scale, |
| TRUE /* bottom */ ); |
| cf2_hint_init( &topHintEdge, |
| hStemHintArray, |
| i, |
| font, |
| hintOrigin, |
| hintmap->scale, |
| FALSE /* top */ ); |
| |
| if ( cf2_hint_isLocked( &bottomHintEdge ) || |
| cf2_hint_isLocked( &topHintEdge ) || |
| cf2_blues_capture( &font->blues, |
| &bottomHintEdge, |
| &topHintEdge ) ) |
| { |
| /* insert captured hint into map */ |
| cf2_hintmap_insertHint( hintmap, &bottomHintEdge, &topHintEdge ); |
| |
| *maskPtr &= ~maskByte; /* turn off the bit for this hint */ |
| } |
| } |
| |
| if ( ( i & 7 ) == 7 ) |
| { |
| /* move to next mask byte */ |
| maskPtr++; |
| maskByte = 0x80; |
| } |
| else |
| maskByte >>= 1; |
| } |
| |
| /* initial hint map includes only captured hints plus maybe one at 0 */ |
| |
| /* |
| * TODO: There is a problem here because we are trying to build a |
| * single hint map containing all captured hints. It is |
| * possible for there to be conflicts between captured hints, |
| * either because of darkening or because the hints are in |
| * separate hint zones (we are ignoring hint zones for the |
| * initial map). An example of the latter is MinionPro-Regular |
| * v2.030 glyph 883 (Greek Capital Alpha with Psili) at 15ppem. |
| * A stem hint for the psili conflicts with the top edge hint |
| * for the base character. The stem hint gets priority because |
| * of its sort order. In glyph 884 (Greek Capital Alpha with |
| * Psili and Oxia), the top of the base character gets a stem |
| * hint, and the psili does not. This creates different initial |
| * maps for the two glyphs resulting in different renderings of |
| * the base character. Will probably defer this either as not |
| * worth the cost or as a font bug. I don't think there is any |
| * good reason for an accent to be captured by an alignment |
| * zone. -darnold 2/12/10 |
| */ |
| |
| if ( initialMap ) |
| { |
| /* Apply a heuristic that inserts a point for (0,0), unless it's */ |
| /* already covered by a mapping. This locks the baseline for glyphs */ |
| /* that have no baseline hints. */ |
| |
| if ( hintmap->count == 0 || |
| hintmap->edge[0].csCoord > 0 || |
| hintmap->edge[hintmap->count - 1].csCoord < 0 ) |
| { |
| /* all edges are above 0 or all edges are below 0; */ |
| /* construct a locked edge hint at 0 */ |
| |
| CF2_HintRec edge, invalid; |
| |
| |
| cf2_hint_initZero( &edge ); |
| |
| edge.flags = CF2_GhostBottom | |
| CF2_Locked | |
| CF2_Synthetic; |
| edge.scale = hintmap->scale; |
| |
| cf2_hint_initZero( &invalid ); |
| cf2_hintmap_insertHint( hintmap, &edge, &invalid ); |
| } |
| } |
| else |
| { |
| /* insert remaining hints */ |
| |
| maskPtr = cf2_hintmask_getMaskPtr( &tempHintMask ); |
| |
| for ( i = 0, maskByte = 0x80; i < bitCount; i++ ) |
| { |
| if ( maskByte & *maskPtr ) |
| { |
| CF2_HintRec bottomHintEdge, topHintEdge; |
| |
| |
| cf2_hint_init( &bottomHintEdge, |
| hStemHintArray, |
| i, |
| font, |
| hintOrigin, |
| hintmap->scale, |
| TRUE /* bottom */ ); |
| cf2_hint_init( &topHintEdge, |
| hStemHintArray, |
| i, |
| font, |
| hintOrigin, |
| hintmap->scale, |
| FALSE /* top */ ); |
| |
| cf2_hintmap_insertHint( hintmap, &bottomHintEdge, &topHintEdge ); |
| } |
| |
| if ( ( i & 7 ) == 7 ) |
| { |
| /* move to next mask byte */ |
| maskPtr++; |
| maskByte = 0x80; |
| } |
| else |
| maskByte >>= 1; |
| } |
| } |
| |
| #ifdef FT_DEBUG_LEVEL_TRACE |
| if ( initialMap ) |
| { |
| FT_TRACE6(( "flags: [p]air [g]host [t]op" |
| " [b]ottom [L]ocked [S]ynthetic\n" )); |
| FT_TRACE6(( "Initial hintmap:\n" )); |
| } |
| else |
| FT_TRACE6(( "Hints:\n" )); |
| #endif |
| |
| cf2_hintmap_dump( hintmap ); |
| |
| /* |
| * Note: The following line is a convenient place to break when |
| * debugging hinting. Examine `hintmap->edge' for the list of |
| * enabled hints, then step over the call to see the effect of |
| * adjustment. We stop here first on the recursive call that |
| * creates the initial map, and then on each counter group and |
| * hint zone. |
| */ |
| |
| /* adjust positions of hint edges that are not locked to blue zones */ |
| cf2_hintmap_adjustHints( hintmap ); |
| |
| FT_TRACE6(( "Hints adjusted:\n" )); |
| cf2_hintmap_dump( hintmap ); |
| |
| /* save the position of all hints that were used in this hint map; */ |
| /* if we use them again, we'll locate them in the same position */ |
| if ( !initialMap ) |
| { |
| for ( i = 0; i < hintmap->count; i++ ) |
| { |
| if ( !cf2_hint_isSynthetic( &hintmap->edge[i] ) ) |
| { |
| /* Note: include both valid and invalid edges */ |
| /* Note: top and bottom edges are copied back separately */ |
| CF2_StemHint stemhint = (CF2_StemHint) |
| cf2_arrstack_getPointer( hStemHintArray, |
| hintmap->edge[i].index ); |
| |
| |
| if ( cf2_hint_isTop( &hintmap->edge[i] ) ) |
| stemhint->maxDS = hintmap->edge[i].dsCoord; |
| else |
| stemhint->minDS = hintmap->edge[i].dsCoord; |
| |
| stemhint->used = TRUE; |
| } |
| } |
| } |
| |
| /* hint map is ready to use */ |
| hintmap->isValid = TRUE; |
| |
| /* remember this mask has been used */ |
| cf2_hintmask_setNew( hintMask, FALSE ); |
| } |
| |
| |
| FT_LOCAL_DEF( void ) |
| cf2_glyphpath_init( CF2_GlyphPath glyphpath, |
| CF2_Font font, |
| CF2_OutlineCallbacks callbacks, |
| CF2_Fixed scaleY, |
| /* CF2_Fixed hShift, */ |
| CF2_ArrStack hStemHintArray, |
| CF2_ArrStack vStemHintArray, |
| CF2_HintMask hintMask, |
| CF2_Fixed hintOriginY, |
| const CF2_Blues blues, |
| const FT_Vector* fractionalTranslation ) |
| { |
| FT_ZERO( glyphpath ); |
| |
| glyphpath->font = font; |
| glyphpath->callbacks = callbacks; |
| |
| cf2_arrstack_init( &glyphpath->hintMoves, |
| font->memory, |
| &font->error, |
| sizeof ( CF2_HintMoveRec ) ); |
| |
| cf2_hintmap_init( &glyphpath->initialHintMap, |
| font, |
| &glyphpath->initialHintMap, |
| &glyphpath->hintMoves, |
| scaleY ); |
| cf2_hintmap_init( &glyphpath->firstHintMap, |
| font, |
| &glyphpath->initialHintMap, |
| &glyphpath->hintMoves, |
| scaleY ); |
| cf2_hintmap_init( &glyphpath->hintMap, |
| font, |
| &glyphpath->initialHintMap, |
| &glyphpath->hintMoves, |
| scaleY ); |
| |
| glyphpath->scaleX = font->innerTransform.a; |
| glyphpath->scaleC = font->innerTransform.c; |
| glyphpath->scaleY = font->innerTransform.d; |
| |
| glyphpath->fractionalTranslation = *fractionalTranslation; |
| |
| #if 0 |
| glyphpath->hShift = hShift; /* for fauxing */ |
| #endif |
| |
| glyphpath->hStemHintArray = hStemHintArray; |
| glyphpath->vStemHintArray = vStemHintArray; |
| glyphpath->hintMask = hintMask; /* ptr to current mask */ |
| glyphpath->hintOriginY = hintOriginY; |
| glyphpath->blues = blues; |
| glyphpath->darken = font->darkened; /* TODO: should we make copies? */ |
| glyphpath->xOffset = font->darkenX; |
| glyphpath->yOffset = font->darkenY; |
| glyphpath->miterLimit = 2 * FT_MAX( |
| cf2_fixedAbs( glyphpath->xOffset ), |
| cf2_fixedAbs( glyphpath->yOffset ) ); |
| |
| /* .1 character space unit */ |
| glyphpath->snapThreshold = cf2_doubleToFixed( 0.1 ); |
| |
| glyphpath->moveIsPending = TRUE; |
| glyphpath->pathIsOpen = FALSE; |
| glyphpath->pathIsClosing = FALSE; |
| glyphpath->elemIsQueued = FALSE; |
| } |
| |
| |
| FT_LOCAL_DEF( void ) |
| cf2_glyphpath_finalize( CF2_GlyphPath glyphpath ) |
| { |
| cf2_arrstack_finalize( &glyphpath->hintMoves ); |
| } |
| |
| |
| /* |
| * Hint point in y-direction and apply outerTransform. |
| * Input `current' hint map (which is actually delayed by one element). |
| * Input x,y point in Character Space. |
| * Output x,y point in Device Space, including translation. |
| */ |
| static void |
| cf2_glyphpath_hintPoint( CF2_GlyphPath glyphpath, |
| CF2_HintMap hintmap, |
| FT_Vector* ppt, |
| CF2_Fixed x, |
| CF2_Fixed y ) |
| { |
| FT_Vector pt; /* hinted point in upright DS */ |
| |
| |
| pt.x = ADD_INT32( FT_MulFix( glyphpath->scaleX, x ), |
| FT_MulFix( glyphpath->scaleC, y ) ); |
| pt.y = cf2_hintmap_map( hintmap, y ); |
| |
| ppt->x = ADD_INT32( |
| FT_MulFix( glyphpath->font->outerTransform.a, pt.x ), |
| ADD_INT32( |
| FT_MulFix( glyphpath->font->outerTransform.c, pt.y ), |
| glyphpath->fractionalTranslation.x ) ); |
| ppt->y = ADD_INT32( |
| FT_MulFix( glyphpath->font->outerTransform.b, pt.x ), |
| ADD_INT32( |
| FT_MulFix( glyphpath->font->outerTransform.d, pt.y ), |
| glyphpath->fractionalTranslation.y ) ); |
| } |
| |
| |
| /* |
| * From two line segments, (u1,u2) and (v1,v2), compute a point of |
| * intersection on the corresponding lines. |
| * Return false if no intersection is found, or if the intersection is |
| * too far away from the ends of the line segments, u2 and v1. |
| * |
| */ |
| static FT_Bool |
| cf2_glyphpath_computeIntersection( CF2_GlyphPath glyphpath, |
| const FT_Vector* u1, |
| const FT_Vector* u2, |
| const FT_Vector* v1, |
| const FT_Vector* v2, |
| FT_Vector* intersection ) |
| { |
| /* |
| * Let `u' be a zero-based vector from the first segment, `v' from the |
| * second segment. |
| * Let `w 'be the zero-based vector from `u1' to `v1'. |
| * `perp' is the `perpendicular dot product'; see |
| * https://mathworld.wolfram.com/PerpDotProduct.html. |
| * `s' is the parameter for the parametric line for the first segment |
| * (`u'). |
| * |
| * See notation in |
| * http://geomalgorithms.com/a05-_intersect-1.html. |
| * Calculations are done in 16.16, but must handle the squaring of |
| * line lengths in character space. We scale all vectors by 1/32 to |
| * avoid overflow. This allows values up to 4095 to be squared. The |
| * scale factor cancels in the divide. |
| * |
| * TODO: the scale factor could be computed from UnitsPerEm. |
| * |
| */ |
| |
| #define cf2_perp( a, b ) \ |
| ( FT_MulFix( a.x, b.y ) - FT_MulFix( a.y, b.x ) ) |
| |
| /* round and divide by 32 */ |
| #define CF2_CS_SCALE( x ) \ |
| ( ( (x) + 0x10 ) >> 5 ) |
| |
| FT_Vector u, v, w; /* scaled vectors */ |
| CF2_Fixed denominator, s; |
| |
| |
| u.x = CF2_CS_SCALE( SUB_INT32( u2->x, u1->x ) ); |
| u.y = CF2_CS_SCALE( SUB_INT32( u2->y, u1->y ) ); |
| v.x = CF2_CS_SCALE( SUB_INT32( v2->x, v1->x ) ); |
| v.y = CF2_CS_SCALE( SUB_INT32( v2->y, v1->y ) ); |
| w.x = CF2_CS_SCALE( SUB_INT32( v1->x, u1->x ) ); |
| w.y = CF2_CS_SCALE( SUB_INT32( v1->y, u1->y ) ); |
| |
| denominator = cf2_perp( u, v ); |
| |
| if ( denominator == 0 ) |
| return FALSE; /* parallel or coincident lines */ |
| |
| s = FT_DivFix( cf2_perp( w, v ), denominator ); |
| |
| intersection->x = ADD_INT32( u1->x, |
| FT_MulFix( s, SUB_INT32( u2->x, u1->x ) ) ); |
| intersection->y = ADD_INT32( u1->y, |
| FT_MulFix( s, SUB_INT32( u2->y, u1->y ) ) ); |
| |
| |
| /* |
| * Special case snapping for horizontal and vertical lines. |
| * This cleans up intersections and reduces problems with winding |
| * order detection. |
| * Sample case is sbc cd KozGoPr6N-Medium.otf 20 16685. |
| * Note: these calculations are in character space. |
| * |
| */ |
| |
| if ( u1->x == u2->x && |
| cf2_fixedAbs( SUB_INT32( intersection->x, |
| u1->x ) ) < glyphpath->snapThreshold ) |
| intersection->x = u1->x; |
| if ( u1->y == u2->y && |
| cf2_fixedAbs( SUB_INT32( intersection->y, |
| u1->y ) ) < glyphpath->snapThreshold ) |
| intersection->y = u1->y; |
| |
| if ( v1->x == v2->x && |
| cf2_fixedAbs( SUB_INT32( intersection->x, |
| v1->x ) ) < glyphpath->snapThreshold ) |
| intersection->x = v1->x; |
| if ( v1->y == v2->y && |
| cf2_fixedAbs( SUB_INT32( intersection->y, |
| v1->y ) ) < glyphpath->snapThreshold ) |
| intersection->y = v1->y; |
| |
| /* limit the intersection distance from midpoint of u2 and v1 */ |
| if ( cf2_fixedAbs( intersection->x - ADD_INT32( u2->x, v1->x ) / 2 ) > |
| glyphpath->miterLimit || |
| cf2_fixedAbs( intersection->y - ADD_INT32( u2->y, v1->y ) / 2 ) > |
| glyphpath->miterLimit ) |
| return FALSE; |
| |
| return TRUE; |
| } |
| |
| |
| /* |
| * Push the cached element (glyphpath->prevElem*) to the outline |
| * consumer. When a darkening offset is used, the end point of the |
| * cached element may be adjusted to an intersection point or we may |
| * synthesize a connecting line to the current element. If we are |
| * closing a subpath, we may also generate a connecting line to the start |
| * point. |
| * |
| * This is where Character Space (CS) is converted to Device Space (DS) |
| * using a hint map. This calculation must use a HintMap that was valid |
| * at the time the element was saved. For the first point in a subpath, |
| * that is a saved HintMap. For most elements, it just means the caller |
| * has delayed building a HintMap from the current HintMask. |
| * |
| * Transform each point with outerTransform and call the outline |
| * callbacks. This is a general 3x3 transform: |
| * |
| * x' = a*x + c*y + tx, y' = b*x + d*y + ty |
| * |
| * but it uses 4 elements from CF2_Font and the translation part |
| * from CF2_GlyphPath. |
| * |
| */ |
| static void |
| cf2_glyphpath_pushPrevElem( CF2_GlyphPath glyphpath, |
| CF2_HintMap hintmap, |
| FT_Vector* nextP0, |
| FT_Vector nextP1, |
| FT_Bool close ) |
| { |
| CF2_CallbackParamsRec params; |
| |
| FT_Vector* prevP0; |
| FT_Vector* prevP1; |
| |
| FT_Vector intersection = { 0, 0 }; |
| FT_Bool useIntersection = FALSE; |
| |
| |
| FT_ASSERT( glyphpath->prevElemOp == CF2_PathOpLineTo || |
| glyphpath->prevElemOp == CF2_PathOpCubeTo ); |
| |
| if ( glyphpath->prevElemOp == CF2_PathOpLineTo ) |
| { |
| prevP0 = &glyphpath->prevElemP0; |
| prevP1 = &glyphpath->prevElemP1; |
| } |
| else |
| { |
| prevP0 = &glyphpath->prevElemP2; |
| prevP1 = &glyphpath->prevElemP3; |
| } |
| |
| /* optimization: if previous and next elements are offset by the same */ |
| /* amount, then there will be no gap, and no need to compute an */ |
| /* intersection. */ |
| if ( prevP1->x != nextP0->x || prevP1->y != nextP0->y ) |
| { |
| /* previous element does not join next element: */ |
| /* adjust end point of previous element to the intersection */ |
| useIntersection = cf2_glyphpath_computeIntersection( glyphpath, |
| prevP0, |
| prevP1, |
| nextP0, |
| &nextP1, |
| &intersection ); |
| if ( useIntersection ) |
| { |
| /* modify the last point of the cached element (either line or */ |
| /* curve) */ |
| *prevP1 = intersection; |
| } |
| } |
| |
| params.pt0 = glyphpath->currentDS; |
| |
| switch( glyphpath->prevElemOp ) |
| { |
| case CF2_PathOpLineTo: |
| params.op = CF2_PathOpLineTo; |
| |
| /* note: pt2 and pt3 are unused */ |
| |
| if ( close ) |
| { |
| /* use first hint map if closing */ |
| cf2_glyphpath_hintPoint( glyphpath, |
| &glyphpath->firstHintMap, |
| ¶ms.pt1, |
| glyphpath->prevElemP1.x, |
| glyphpath->prevElemP1.y ); |
| } |
| else |
| { |
| cf2_glyphpath_hintPoint( glyphpath, |
| hintmap, |
| ¶ms.pt1, |
| glyphpath->prevElemP1.x, |
| glyphpath->prevElemP1.y ); |
| } |
| |
| /* output only non-zero length lines */ |
| if ( params.pt0.x != params.pt1.x || params.pt0.y != params.pt1.y ) |
| { |
| glyphpath->callbacks->lineTo( glyphpath->callbacks, ¶ms ); |
| |
| glyphpath->currentDS = params.pt1; |
| } |
| break; |
| |
| case CF2_PathOpCubeTo: |
| params.op = CF2_PathOpCubeTo; |
| |
| /* TODO: should we intersect the interior joins (p1-p2 and p2-p3)? */ |
| cf2_glyphpath_hintPoint( glyphpath, |
| hintmap, |
| ¶ms.pt1, |
| glyphpath->prevElemP1.x, |
| glyphpath->prevElemP1.y ); |
| cf2_glyphpath_hintPoint( glyphpath, |
| hintmap, |
| ¶ms.pt2, |
| glyphpath->prevElemP2.x, |
| glyphpath->prevElemP2.y ); |
| cf2_glyphpath_hintPoint( glyphpath, |
| hintmap, |
| ¶ms.pt3, |
| glyphpath->prevElemP3.x, |
| glyphpath->prevElemP3.y ); |
| |
| glyphpath->callbacks->cubeTo( glyphpath->callbacks, ¶ms ); |
| |
| glyphpath->currentDS = params.pt3; |
| |
| break; |
| } |
| |
| if ( !useIntersection || close ) |
| { |
| /* insert connecting line between end of previous element and start */ |
| /* of current one */ |
| /* note: at the end of a subpath, we might do both, so use `nextP0' */ |
| /* before we change it, below */ |
| |
| if ( close ) |
| { |
| /* if we are closing the subpath, then nextP0 is in the first */ |
| /* hint zone */ |
| cf2_glyphpath_hintPoint( glyphpath, |
| &glyphpath->firstHintMap, |
| ¶ms.pt1, |
| nextP0->x, |
| nextP0->y ); |
| } |
| else |
| { |
| cf2_glyphpath_hintPoint( glyphpath, |
| hintmap, |
| ¶ms.pt1, |
| nextP0->x, |
| nextP0->y ); |
| } |
| |
| if ( params.pt1.x != glyphpath->currentDS.x || |
| params.pt1.y != glyphpath->currentDS.y ) |
| { |
| /* length is nonzero */ |
| params.op = CF2_PathOpLineTo; |
| params.pt0 = glyphpath->currentDS; |
| |
| /* note: pt2 and pt3 are unused */ |
| glyphpath->callbacks->lineTo( glyphpath->callbacks, ¶ms ); |
| |
| glyphpath->currentDS = params.pt1; |
| } |
| } |
| |
| if ( useIntersection ) |
| { |
| /* return intersection point to caller */ |
| *nextP0 = intersection; |
| } |
| } |
| |
| |
| /* push a MoveTo element based on current point and offset of current */ |
| /* element */ |
| static void |
| cf2_glyphpath_pushMove( CF2_GlyphPath glyphpath, |
| FT_Vector start ) |
| { |
| CF2_CallbackParamsRec params; |
| |
| |
| params.op = CF2_PathOpMoveTo; |
| params.pt0 = glyphpath->currentDS; |
| |
| /* Test if move has really happened yet; it would have called */ |
| /* `cf2_hintmap_build' to set `isValid'. */ |
| if ( !cf2_hintmap_isValid( &glyphpath->hintMap ) ) |
| { |
| /* we are here iff first subpath is missing a moveto operator: */ |
| /* synthesize first moveTo to finish initialization of hintMap */ |
| cf2_glyphpath_moveTo( glyphpath, |
| glyphpath->start.x, |
| glyphpath->start.y ); |
| } |
| |
| cf2_glyphpath_hintPoint( glyphpath, |
| &glyphpath->hintMap, |
| ¶ms.pt1, |
| start.x, |
| start.y ); |
| |
| /* note: pt2 and pt3 are unused */ |
| glyphpath->callbacks->moveTo( glyphpath->callbacks, ¶ms ); |
| |
| glyphpath->currentDS = params.pt1; |
| glyphpath->offsetStart0 = start; |
| } |
| |
| |
| /* |
| * All coordinates are in character space. |
| * On input, (x1, y1) and (x2, y2) give line segment. |
| * On output, (x, y) give offset vector. |
| * We use a piecewise approximation to trig functions. |
| * |
| * TODO: Offset true perpendicular and proper length |
| * supply the y-translation for hinting here, too, |
| * that adds yOffset unconditionally to *y. |
| */ |
| static void |
| cf2_glyphpath_computeOffset( CF2_GlyphPath glyphpath, |
| CF2_Fixed x1, |
| CF2_Fixed y1, |
| CF2_Fixed x2, |
| CF2_Fixed y2, |
| CF2_Fixed* x, |
| CF2_Fixed* y ) |
| { |
| CF2_Fixed dx = SUB_INT32( x2, x1 ); |
| CF2_Fixed dy = SUB_INT32( y2, y1 ); |
| |
| |
| /* note: negative offsets don't work here; negate deltas to change */ |
| /* quadrants, below */ |
| if ( glyphpath->font->reverseWinding ) |
| { |
| dx = NEG_INT32( dx ); |
| dy = NEG_INT32( dy ); |
| } |
| |
| *x = *y = 0; |
| |
| if ( !glyphpath->darken ) |
| return; |
| |
| /* add momentum for this path element */ |
| glyphpath->callbacks->windingMomentum = |
| ADD_INT32( glyphpath->callbacks->windingMomentum, |
| cf2_getWindingMomentum( x1, y1, x2, y2 ) ); |
| |
| /* note: allow mixed integer and fixed multiplication here */ |
| if ( dx >= 0 ) |
| { |
| if ( dy >= 0 ) |
| { |
| /* first quadrant, +x +y */ |
| |
| if ( dx > MUL_INT32( 2, dy ) ) |
| { |
| /* +x */ |
| *x = 0; |
| *y = 0; |
| } |
| else if ( dy > MUL_INT32( 2, dx ) ) |
| { |
| /* +y */ |
| *x = glyphpath->xOffset; |
| *y = glyphpath->yOffset; |
| } |
| else |
| { |
| /* +x +y */ |
| *x = FT_MulFix( cf2_doubleToFixed( 0.7 ), |
| glyphpath->xOffset ); |
| *y = FT_MulFix( cf2_doubleToFixed( 1.0 - 0.7 ), |
| glyphpath->yOffset ); |
| } |
| } |
| else |
| { |
| /* fourth quadrant, +x -y */ |
| |
| if ( dx > MUL_INT32( -2, dy ) ) |
| { |
| /* +x */ |
| *x = 0; |
| *y = 0; |
| } |
| else if ( NEG_INT32( dy ) > MUL_INT32( 2, dx ) ) |
| { |
| /* -y */ |
| *x = NEG_INT32( glyphpath->xOffset ); |
| *y = glyphpath->yOffset; |
| } |
| else |
| { |
| /* +x -y */ |
| *x = FT_MulFix( cf2_doubleToFixed( -0.7 ), |
| glyphpath->xOffset ); |
| *y = FT_MulFix( cf2_doubleToFixed( 1.0 - 0.7 ), |
| glyphpath->yOffset ); |
| } |
| } |
| } |
| else |
| { |
| if ( dy >= 0 ) |
| { |
| /* second quadrant, -x +y */ |
| |
| if ( NEG_INT32( dx ) > MUL_INT32( 2, dy ) ) |
| { |
| /* -x */ |
| *x = 0; |
| *y = MUL_INT32( 2, glyphpath->yOffset ); |
| } |
| else if ( dy > MUL_INT32( -2, dx ) ) |
| { |
| /* +y */ |
| *x = glyphpath->xOffset; |
| *y = glyphpath->yOffset; |
| } |
| else |
| { |
| /* -x +y */ |
| *x = FT_MulFix( cf2_doubleToFixed( 0.7 ), |
| glyphpath->xOffset ); |
| *y = FT_MulFix( cf2_doubleToFixed( 1.0 + 0.7 ), |
| glyphpath->yOffset ); |
| } |
| } |
| else |
| { |
| /* third quadrant, -x -y */ |
| |
| if ( NEG_INT32( dx ) > MUL_INT32( -2, dy ) ) |
| { |
| /* -x */ |
| *x = 0; |
| *y = MUL_INT32( 2, glyphpath->yOffset ); |
| } |
| else if ( NEG_INT32( dy ) > MUL_INT32( -2, dx ) ) |
| { |
| /* -y */ |
| *x = NEG_INT32( glyphpath->xOffset ); |
| *y = glyphpath->yOffset; |
| } |
| else |
| { |
| /* -x -y */ |
| *x = FT_MulFix( cf2_doubleToFixed( -0.7 ), |
| glyphpath->xOffset ); |
| *y = FT_MulFix( cf2_doubleToFixed( 1.0 + 0.7 ), |
| glyphpath->yOffset ); |
| } |
| } |
| } |
| } |
| |
| |
| /* |
| * The functions cf2_glyphpath_{moveTo,lineTo,curveTo,closeOpenPath} are |
| * called by the interpreter with Character Space (CS) coordinates. Each |
| * path element is placed into a queue of length one to await the |
| * calculation of the following element. At that time, the darkening |
| * offset of the following element is known and joins can be computed, |
| * including possible modification of this element, before mapping to |
| * Device Space (DS) and passing it on to the outline consumer. |
| * |
| */ |
| FT_LOCAL_DEF( void ) |
| cf2_glyphpath_moveTo( CF2_GlyphPath glyphpath, |
| CF2_Fixed x, |
| CF2_Fixed y ) |
| { |
| cf2_glyphpath_closeOpenPath( glyphpath ); |
| |
| /* save the parameters of the move for later, when we'll know how to */ |
| /* offset it; */ |
| /* also save last move point */ |
| glyphpath->currentCS.x = glyphpath->start.x = x; |
| glyphpath->currentCS.y = glyphpath->start.y = y; |
| |
| glyphpath->moveIsPending = TRUE; |
| |
| /* ensure we have a valid map with current mask */ |
| if ( !cf2_hintmap_isValid( &glyphpath->hintMap ) || |
| cf2_hintmask_isNew( glyphpath->hintMask ) ) |
| cf2_hintmap_build( &glyphpath->hintMap, |
| glyphpath->hStemHintArray, |
| glyphpath->vStemHintArray, |
| glyphpath->hintMask, |
| glyphpath->hintOriginY, |
| FALSE ); |
| |
| /* save a copy of current HintMap to use when drawing initial point */ |
| glyphpath->firstHintMap = glyphpath->hintMap; /* structure copy */ |
| } |
| |
| |
| FT_LOCAL_DEF( void ) |
| cf2_glyphpath_lineTo( CF2_GlyphPath glyphpath, |
| CF2_Fixed x, |
| CF2_Fixed y ) |
| { |
| CF2_Fixed xOffset, yOffset; |
| FT_Vector P0, P1; |
| FT_Bool newHintMap; |
| |
| /* |
| * New hints will be applied after cf2_glyphpath_pushPrevElem has run. |
| * In case this is a synthesized closing line, any new hints should be |
| * delayed until this path is closed (`cf2_hintmask_isNew' will be |
| * called again before the next line or curve). |
| */ |
| |
| /* true if new hint map not on close */ |
| newHintMap = cf2_hintmask_isNew( glyphpath->hintMask ) && |
| !glyphpath->pathIsClosing; |
| |
| /* |
| * Zero-length lines may occur in the charstring. Because we cannot |
| * compute darkening offsets or intersections from zero-length lines, |
| * it is best to remove them and avoid artifacts. However, zero-length |
| * lines in CS at the start of a new hint map can generate non-zero |
| * lines in DS due to hint substitution. We detect a change in hint |
| * map here and pass those zero-length lines along. |
| */ |
| |
| /* |
| * Note: Find explicitly closed paths here with a conditional |
| * breakpoint using |
| * |
| * !gp->pathIsClosing && gp->start.x == x && gp->start.y == y |
| * |
| */ |
| |
| if ( glyphpath->currentCS.x == x && |
| glyphpath->currentCS.y == y && |
| !newHintMap ) |
| /* |
| * Ignore zero-length lines in CS where the hint map is the same |
| * because the line in DS will also be zero length. |
| * |
| * Ignore zero-length lines when we synthesize a closing line because |
| * the close will be handled in cf2_glyphPath_pushPrevElem. |
| */ |
| return; |
| |
| cf2_glyphpath_computeOffset( glyphpath, |
| glyphpath->currentCS.x, |
| glyphpath->currentCS.y, |
| x, |
| y, |
| &xOffset, |
| &yOffset ); |
| |
| /* construct offset points */ |
| P0.x = ADD_INT32( glyphpath->currentCS.x, xOffset ); |
| P0.y = ADD_INT32( glyphpath->currentCS.y, yOffset ); |
| P1.x = ADD_INT32( x, xOffset ); |
| P1.y = ADD_INT32( y, yOffset ); |
| |
| if ( glyphpath->moveIsPending ) |
| { |
| /* emit offset 1st point as MoveTo */ |
| cf2_glyphpath_pushMove( glyphpath, P0 ); |
| |
| glyphpath->moveIsPending = FALSE; /* adjust state machine */ |
| glyphpath->pathIsOpen = TRUE; |
| |
| glyphpath->offsetStart1 = P1; /* record second point */ |
| } |
| |
| if ( glyphpath->elemIsQueued ) |
| { |
| FT_ASSERT( cf2_hintmap_isValid( &glyphpath->hintMap ) || |
| glyphpath->hintMap.count == 0 ); |
| |
| cf2_glyphpath_pushPrevElem( glyphpath, |
| &glyphpath->hintMap, |
| &P0, |
| P1, |
| FALSE ); |
| } |
| |
| /* queue the current element with offset points */ |
| glyphpath->elemIsQueued = TRUE; |
| glyphpath->prevElemOp = CF2_PathOpLineTo; |
| glyphpath->prevElemP0 = P0; |
| glyphpath->prevElemP1 = P1; |
| |
| /* update current map */ |
| if ( newHintMap ) |
| cf2_hintmap_build( &glyphpath->hintMap, |
| glyphpath->hStemHintArray, |
| glyphpath->vStemHintArray, |
| glyphpath->hintMask, |
| glyphpath->hintOriginY, |
| FALSE ); |
| |
| glyphpath->currentCS.x = x; /* pre-offset current point */ |
| glyphpath->currentCS.y = y; |
| } |
| |
| |
| FT_LOCAL_DEF( void ) |
| cf2_glyphpath_curveTo( CF2_GlyphPath glyphpath, |
| CF2_Fixed x1, |
| CF2_Fixed y1, |
| CF2_Fixed x2, |
| CF2_Fixed y2, |
| CF2_Fixed x3, |
| CF2_Fixed y3 ) |
| { |
| CF2_Fixed xOffset1, yOffset1, xOffset3, yOffset3; |
| FT_Vector P0, P1, P2, P3; |
| |
| |
| /* TODO: ignore zero length portions of curve?? */ |
| cf2_glyphpath_computeOffset( glyphpath, |
| glyphpath->currentCS.x, |
| glyphpath->currentCS.y, |
| x1, |
| y1, |
| &xOffset1, |
| &yOffset1 ); |
| cf2_glyphpath_computeOffset( glyphpath, |
| x2, |
| y2, |
| x3, |
| y3, |
| &xOffset3, |
| &yOffset3 ); |
| |
| /* add momentum from the middle segment */ |
| glyphpath->callbacks->windingMomentum = |
| ADD_INT32( glyphpath->callbacks->windingMomentum, |
| cf2_getWindingMomentum( x1, y1, x2, y2 ) ); |
| |
| /* construct offset points */ |
| P0.x = ADD_INT32( glyphpath->currentCS.x, xOffset1 ); |
| P0.y = ADD_INT32( glyphpath->currentCS.y, yOffset1 ); |
| P1.x = ADD_INT32( x1, xOffset1 ); |
| P1.y = ADD_INT32( y1, yOffset1 ); |
| /* note: preserve angle of final segment by using offset3 at both ends */ |
| P2.x = ADD_INT32( x2, xOffset3 ); |
| P2.y = ADD_INT32( y2, yOffset3 ); |
| P3.x = ADD_INT32( x3, xOffset3 ); |
| P3.y = ADD_INT32( y3, yOffset3 ); |
| |
| if ( glyphpath->moveIsPending ) |
| { |
| /* emit offset 1st point as MoveTo */ |
| cf2_glyphpath_pushMove( glyphpath, P0 ); |
| |
| glyphpath->moveIsPending = FALSE; |
| glyphpath->pathIsOpen = TRUE; |
| |
| glyphpath->offsetStart1 = P1; /* record second point */ |
| } |
| |
| if ( glyphpath->elemIsQueued ) |
| { |
| FT_ASSERT( cf2_hintmap_isValid( &glyphpath->hintMap ) || |
| glyphpath->hintMap.count == 0 ); |
| |
| cf2_glyphpath_pushPrevElem( glyphpath, |
| &glyphpath->hintMap, |
| &P0, |
| P1, |
| FALSE ); |
| } |
| |
| /* queue the current element with offset points */ |
| glyphpath->elemIsQueued = TRUE; |
| glyphpath->prevElemOp = CF2_PathOpCubeTo; |
| glyphpath->prevElemP0 = P0; |
| glyphpath->prevElemP1 = P1; |
| glyphpath->prevElemP2 = P2; |
| glyphpath->prevElemP3 = P3; |
| |
| /* update current map */ |
| if ( cf2_hintmask_isNew( glyphpath->hintMask ) ) |
| cf2_hintmap_build( &glyphpath->hintMap, |
| glyphpath->hStemHintArray, |
| glyphpath->vStemHintArray, |
| glyphpath->hintMask, |
| glyphpath->hintOriginY, |
| FALSE ); |
| |
| glyphpath->currentCS.x = x3; /* pre-offset current point */ |
| glyphpath->currentCS.y = y3; |
| } |
| |
| |
| FT_LOCAL_DEF( void ) |
| cf2_glyphpath_closeOpenPath( CF2_GlyphPath glyphpath ) |
| { |
| if ( glyphpath->pathIsOpen ) |
| { |
| /* |
| * A closing line in Character Space line is always generated below |
| * with `cf2_glyphPath_lineTo'. It may be ignored later if it turns |
| * out to be zero length in Device Space. |
| */ |
| glyphpath->pathIsClosing = TRUE; |
| |
| cf2_glyphpath_lineTo( glyphpath, |
| glyphpath->start.x, |
| glyphpath->start.y ); |
| |
| /* empty the final element from the queue and close the path */ |
| if ( glyphpath->elemIsQueued ) |
| cf2_glyphpath_pushPrevElem( glyphpath, |
| &glyphpath->hintMap, |
| &glyphpath->offsetStart0, |
| glyphpath->offsetStart1, |
| TRUE ); |
| |
| /* reset state machine */ |
| glyphpath->moveIsPending = TRUE; |
| glyphpath->pathIsOpen = FALSE; |
| glyphpath->pathIsClosing = FALSE; |
| glyphpath->elemIsQueued = FALSE; |
| } |
| } |
| |
| |
| /* END */ |