0,0 → 1,1734 |
/***************************************************************************/ |
/* */ |
/* cf2hints.c */ |
/* */ |
/* Adobe's code for handling CFF hints (body). */ |
/* */ |
/* Copyright 2007-2013 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 "cf2ft.h" |
#include FT_INTERNAL_DEBUG_H |
|
#include "cf2glue.h" |
#include "cf2font.h" |
#include "cf2hints.h" |
#include "cf2intrp.h" |
|
|
/*************************************************************************/ |
/* */ |
/* The macro FT_COMPONENT is used in trace mode. It is an implicit */ |
/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ |
/* messages during execution. */ |
/* */ |
#undef FT_COMPONENT |
#define FT_COMPONENT trace_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 ) * ( ( y2 - y1 ) >> 16 ) - |
( y1 >> 16 ) * ( ( 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 = 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 += 2 * font->darkenY; |
|
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 != 0 ); |
} |
|
|
static FT_Bool |
cf2_hint_isPair( const CF2_Hint hint ) |
{ |
return (FT_Bool)( ( hint->flags & |
( CF2_PairBottom | CF2_PairTop ) ) != 0 ); |
} |
|
|
static FT_Bool |
cf2_hint_isPairTop( const CF2_Hint hint ) |
{ |
return (FT_Bool)( ( hint->flags & CF2_PairTop ) != 0 ); |
} |
|
|
FT_LOCAL_DEF( FT_Bool ) |
cf2_hint_isTop( const CF2_Hint hint ) |
{ |
return (FT_Bool)( ( hint->flags & |
( CF2_PairTop | CF2_GhostTop ) ) != 0 ); |
} |
|
|
FT_LOCAL_DEF( FT_Bool ) |
cf2_hint_isBottom( const CF2_Hint hint ) |
{ |
return (FT_Bool)( ( hint->flags & |
( CF2_PairBottom | CF2_GhostBottom ) ) != 0 ); |
} |
|
|
static FT_Bool |
cf2_hint_isLocked( const CF2_Hint hint ) |
{ |
return (FT_Bool)( ( hint->flags & CF2_Locked ) != 0 ); |
} |
|
|
static FT_Bool |
cf2_hint_isSynthetic( const CF2_Hint hint ) |
{ |
return (FT_Bool)( ( hint->flags & CF2_Synthetic ) != 0 ); |
} |
|
|
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; |
} |
|
|
/* transform character space coordinate to device space using hint map */ |
static CF2_Fixed |
cf2_hintmap_map( CF2_HintMap hintmap, |
CF2_Fixed csCoord ) |
{ |
FT_ASSERT( hintmap->isValid ); /* must call Build before Map */ |
FT_ASSERT( hintmap->lastIndex < CF2_MAX_HINT_EDGES ); |
|
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; |
|
|
/* 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 FT_MulFix( 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 FT_MulFix( 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] ); |
|
|
/* 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] ) ); |
|
if ( !cf2_hint_isLocked( &hintmap->edge[i] ) ) |
{ |
/* hint edge is not locked, we can adjust it */ |
CF2_Fixed fracDown = cf2_fixedFraction( hintmap->edge[i].dsCoord ); |
CF2_Fixed fracUp = cf2_fixedFraction( hintmap->edge[j].dsCoord ); |
|
/* 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 ); |
|
/* final amount to move edge or edge pair */ |
CF2_Fixed move; |
|
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 >= |
hintmap->edge[j].dsCoord + moveUp + upMinCounter ) |
{ |
/* there is room to move up; is there also room to move down? */ |
if ( i == 0 || |
hintmap->edge[i - 1].dsCoord <= |
hintmap->edge[i].dsCoord + 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 <= |
hintmap->edge[i].dsCoord + 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 += move; |
if ( isPair ) |
hintmap->edge[j].dsCoord += move; |
} |
|
/* assert there are no overlaps in device space */ |
FT_ASSERT( i == 0 || |
hintmap->edge[i - 1].dsCoord <= hintmap->edge[i].dsCoord ); |
FT_ASSERT( i < j || |
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( |
hintmap->edge[i].dsCoord - hintmap->edge[i - 1].dsCoord, |
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( |
hintmap->edge[j].dsCoord - hintmap->edge[j - 1].dsCoord, |
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 >= |
hintmap->edge[j].dsCoord + hintMove->moveUp + CF2_MIN_COUNTER ) |
{ |
/* there is more room now, move edge up */ |
hintmap->edge[j].dsCoord += hintMove->moveUp; |
|
if ( cf2_hint_isPair( &hintmap->edge[j] ) ) |
{ |
FT_ASSERT( j > 0 ); |
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 */ |
FT_ASSERT( !isPair || |
topHintEdge->csCoord >= bottomHintEdge->csCoord ); |
|
/* linear search to find index value of insertion point */ |
indexInsert = 0; |
for ( ; indexInsert < hintmap->count; indexInsert++ ) |
{ |
if ( hintmap->edge[indexInsert].csCoord > firstHintEdge->csCoord ) |
break; |
} |
|
/* |
* Discard any hints that overlap in character space. Most often, |
* this is while building the initial map, but in theory, it can also |
* occur because of darkening. |
* |
*/ |
if ( indexInsert < hintmap->count ) |
{ |
/* we are inserting before an existing edge: */ |
/* 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, |
( secondHintEdge->csCoord + |
firstHintEdge->csCoord ) / 2 ); |
CF2_Fixed halfWidth = FT_MulFix( |
( secondHintEdge->csCoord - |
firstHintEdge->csCoord ) / 2, |
hintmap->scale ); |
|
|
firstHintEdge->dsCoord = midpoint - halfWidth; |
secondHintEdge->dsCoord = 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 */ |
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_Int iSrc = hintmap->count - 1; |
CF2_Int iDst = isPair ? hintmap->count + 1 : hintmap->count; |
|
CF2_Int 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; |
|
if ( isPair ) |
{ |
/* insert second edge */ |
hintmap->edge[indexInsert + 1] = *secondHintEdge; /* copy struct */ |
hintmap->count += 1; |
} |
} |
|
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 ) ); |
} |
|
/* 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 */ |
/* TODO: compare this to cffhintmaskGetBitCount */ |
bitCount = cf2_arrstack_size( hStemHintArray ); |
|
/* 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; |
} |
} |
|
/* |
* 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 ); |
|
/* 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_floatToFixed( 0.1f ); |
|
glyphpath->moveIsPending = TRUE; |
glyphpath->pathIsOpen = 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 = FT_MulFix( glyphpath->scaleX, x ) + |
FT_MulFix( glyphpath->scaleC, y ); |
pt.y = cf2_hintmap_map( hintmap, y ); |
|
ppt->x = FT_MulFix( glyphpath->font->outerTransform.a, pt.x ) + |
FT_MulFix( glyphpath->font->outerTransform.c, pt.y ) + |
glyphpath->fractionalTranslation.x; |
ppt->y = FT_MulFix( glyphpath->font->outerTransform.b, pt.x ) + |
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 |
* http://mathworld.wolfram.com/PerpDotProduct.html. |
* `s' is the parameter for the parametric line for the first segment |
* (`u'). |
* |
* See notation in |
* http://softsurfer.com/Archive/algorithm_0104/algorithm_0104B.htm. |
* 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( u2->x - u1->x ); |
u.y = CF2_CS_SCALE( u2->y - u1->y ); |
v.x = CF2_CS_SCALE( v2->x - v1->x ); |
v.y = CF2_CS_SCALE( v2->y - v1->y ); |
w.x = CF2_CS_SCALE( v1->x - u1->x ); |
w.y = CF2_CS_SCALE( 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 = u1->x + FT_MulFix( s, u2->x - u1->x ); |
intersection->y = u1->y + FT_MulFix( s, 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( intersection->x - u1->x ) < glyphpath->snapThreshold ) |
intersection->x = u1->x; |
if ( u1->y == u2->y && |
cf2_fixedAbs( intersection->y - u1->y ) < glyphpath->snapThreshold ) |
intersection->y = u1->y; |
|
if ( v1->x == v2->x && |
cf2_fixedAbs( intersection->x - v1->x ) < glyphpath->snapThreshold ) |
intersection->x = v1->x; |
if ( v1->y == v2->y && |
cf2_fixedAbs( 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 - ( u2->x + v1->x ) / 2 ) > |
glyphpath->miterLimit || |
cf2_fixedAbs( intersection->y - ( 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 it may be |
* connected by a line to the current element. 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 */ |
cf2_glyphpath_hintPoint( glyphpath, |
hintmap, |
¶ms.pt1, |
glyphpath->prevElemP1.x, |
glyphpath->prevElemP1.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 */ |
|
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 = x2 - x1; |
CF2_Fixed dy = y2 - y1; |
|
|
/* note: negative offsets don't work here; negate deltas to change */ |
/* quadrants, below */ |
if ( glyphpath->font->reverseWinding ) |
{ |
dx = -dx; |
dy = -dy; |
} |
|
*x = *y = 0; |
|
if ( !glyphpath->darken ) |
return; |
|
/* add momentum for this path element */ |
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 > 2 * dy ) |
{ |
/* +x */ |
*x = 0; |
*y = 0; |
} |
else if ( dy > 2 * dx ) |
{ |
/* +y */ |
*x = glyphpath->xOffset; |
*y = glyphpath->yOffset; |
} |
else |
{ |
/* +x +y */ |
*x = FT_MulFix( cf2_floatToFixed( 0.7 ), |
glyphpath->xOffset ); |
*y = FT_MulFix( cf2_floatToFixed( 1.0 - 0.7 ), |
glyphpath->yOffset ); |
} |
} |
else |
{ |
/* fourth quadrant, +x -y */ |
|
if ( dx > -2 * dy ) |
{ |
/* +x */ |
*x = 0; |
*y = 0; |
} |
else if ( -dy > 2 * dx ) |
{ |
/* -y */ |
*x = -glyphpath->xOffset; |
*y = glyphpath->yOffset; |
} |
else |
{ |
/* +x -y */ |
*x = FT_MulFix( cf2_floatToFixed( -0.7 ), |
glyphpath->xOffset ); |
*y = FT_MulFix( cf2_floatToFixed( 1.0 - 0.7 ), |
glyphpath->yOffset ); |
} |
} |
} |
else |
{ |
if ( dy >= 0 ) |
{ |
/* second quadrant, -x +y */ |
|
if ( -dx > 2 * dy ) |
{ |
/* -x */ |
*x = 0; |
*y = 2 * glyphpath->yOffset; |
} |
else if ( dy > -2 * dx ) |
{ |
/* +y */ |
*x = glyphpath->xOffset; |
*y = glyphpath->yOffset; |
} |
else |
{ |
/* -x +y */ |
*x = FT_MulFix( cf2_floatToFixed( 0.7 ), |
glyphpath->xOffset ); |
*y = FT_MulFix( cf2_floatToFixed( 1.0 + 0.7 ), |
glyphpath->yOffset ); |
} |
} |
else |
{ |
/* third quadrant, -x -y */ |
|
if ( -dx > -2 * dy ) |
{ |
/* -x */ |
*x = 0; |
*y = 2 * glyphpath->yOffset; |
} |
else if ( -dy > -2 * dx ) |
{ |
/* -y */ |
*x = -glyphpath->xOffset; |
*y = glyphpath->xOffset; |
} |
else |
{ |
/* -x -y */ |
*x = FT_MulFix( cf2_floatToFixed( -0.7 ), |
glyphpath->xOffset ); |
*y = FT_MulFix( cf2_floatToFixed( 1.0 + 0.7 ), |
glyphpath->yOffset ); |
} |
} |
} |
} |
|
|
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; |
|
|
/* can't compute offset of zero length line, so ignore them */ |
if ( glyphpath->currentCS.x == x && glyphpath->currentCS.y == y ) |
return; |
|
cf2_glyphpath_computeOffset( glyphpath, |
glyphpath->currentCS.x, |
glyphpath->currentCS.y, |
x, |
y, |
&xOffset, |
&yOffset ); |
|
/* construct offset points */ |
P0.x = glyphpath->currentCS.x + xOffset; |
P0.y = glyphpath->currentCS.y + yOffset; |
P1.x = x + xOffset; |
P1.y = 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 ) ); |
|
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 ( cf2_hintmask_isNew( glyphpath->hintMask ) ) |
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 += |
cf2_getWindingMomentum( x1, y1, x2, y2 ); |
|
/* construct offset points */ |
P0.x = glyphpath->currentCS.x + xOffset1; |
P0.y = glyphpath->currentCS.y + yOffset1; |
P1.x = x1 + xOffset1; |
P1.y = y1 + yOffset1; |
/* note: preserve angle of final segment by using offset3 at both ends */ |
P2.x = x2 + xOffset3; |
P2.y = y2 + yOffset3; |
P3.x = x3 + xOffset3; |
P3.y = 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 ) ); |
|
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 ) |
{ |
FT_ASSERT( cf2_hintmap_isValid( &glyphpath->firstHintMap ) ); |
|
/* since we need to apply an offset to the implicit lineto, we make */ |
/* it explicit here */ |
cf2_glyphpath_lineTo( glyphpath, |
glyphpath->start.x, |
glyphpath->start.y ); |
|
/* Draw previous element (the explicit LineTo we just created, */ |
/* above) and connect it to the start point, but with the offset we */ |
/* saved from the first element. */ |
/* Use the saved HintMap, too. */ |
FT_ASSERT( glyphpath->elemIsQueued ); |
|
cf2_glyphpath_pushPrevElem( glyphpath, |
&glyphpath->firstHintMap, |
&glyphpath->offsetStart0, |
glyphpath->offsetStart1, |
TRUE ); |
|
/* reset state machine */ |
glyphpath->moveIsPending = TRUE; |
glyphpath->pathIsOpen = FALSE; |
glyphpath->elemIsQueued = FALSE; |
} |
} |
|
|
/* END */ |