+++ /dev/null
-/***************************************************************************/
-/* */
-/* cf2font.c */
-/* */
-/* Adobe's code for font instances (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 <ft2build.h>
-#include FT_INTERNAL_CALC_H
-
-#include "cf2ft.h"
-
-#include "cf2glue.h"
-#include "cf2font.h"
-#include "cf2error.h"
-#include "cf2intrp.h"
-
-
- /* Compute a stem darkening amount in character space. */
- static void
- cf2_computeDarkening( CF2_Fixed emRatio,
- CF2_Fixed ppem,
- CF2_Fixed stemWidth,
- CF2_Fixed* darkenAmount,
- CF2_Fixed boldenAmount,
- FT_Bool stemDarkened,
- FT_Int* darkenParams )
- {
- /*
- * Total darkening amount is computed in 1000 unit character space
- * using the modified 5 part curve as Adobe's Avalon rasterizer.
- * The darkening amount is smaller for thicker stems.
- * It becomes zero when the stem is thicker than 2.333 pixels.
- *
- * By default, we use
- *
- * darkenAmount = 0.4 pixels if scaledStem <= 0.5 pixels,
- * darkenAmount = 0.275 pixels if 1 <= scaledStem <= 1.667 pixels,
- * darkenAmount = 0 pixel if scaledStem >= 2.333 pixels,
- *
- * and piecewise linear in-between:
- *
- *
- * darkening
- * ^
- * |
- * | (x1,y1)
- * |--------+
- * | \
- * | \
- * | \ (x3,y3)
- * | +----------+
- * | (x2,y2) \
- * | \
- * | \
- * | +-----------------
- * | (x4,y4)
- * +---------------------------------------------> stem
- * thickness
- *
- *
- * This corresponds to the following values for the
- * `darkening-parameters' property:
- *
- * (x1, y1) = (500, 400)
- * (x2, y2) = (1000, 275)
- * (x3, y3) = (1667, 275)
- * (x4, y4) = (2333, 0)
- *
- */
-
- /* Internal calculations are done in units per thousand for */
- /* convenience. The x axis is scaled stem width in */
- /* thousandths of a pixel. That is, 1000 is 1 pixel. */
- /* The y axis is darkening amount in thousandths of a pixel.*/
- /* In the code, below, dividing by ppem and */
- /* adjusting for emRatio converts darkenAmount to character */
- /* space (font units). */
- CF2_Fixed stemWidthPer1000, scaledStem;
- FT_Int logBase2;
-
-
- *darkenAmount = 0;
-
- if ( boldenAmount == 0 && !stemDarkened )
- return;
-
- /* protect against range problems and divide by zero */
- if ( emRatio < cf2_doubleToFixed( .01 ) )
- return;
-
- if ( stemDarkened )
- {
- FT_Int x1 = darkenParams[0];
- FT_Int y1 = darkenParams[1];
- FT_Int x2 = darkenParams[2];
- FT_Int y2 = darkenParams[3];
- FT_Int x3 = darkenParams[4];
- FT_Int y3 = darkenParams[5];
- FT_Int x4 = darkenParams[6];
- FT_Int y4 = darkenParams[7];
-
-
- /* convert from true character space to 1000 unit character space; */
- /* add synthetic emboldening effect */
-
- /* `stemWidthPer1000' will not overflow for a legitimate font */
-
- stemWidthPer1000 = FT_MulFix( stemWidth + boldenAmount, emRatio );
-
- /* `scaledStem' can easily overflow, so we must clamp its maximum */
- /* value; the test doesn't need to be precise, but must be */
- /* conservative. The clamp value (default 2333) where */
- /* `darkenAmount' is zero is well below the overflow value of */
- /* 32767. */
- /* */
- /* FT_MSB computes the integer part of the base 2 logarithm. The */
- /* number of bits for the product is 1 or 2 more than the sum of */
- /* logarithms; remembering that the 16 lowest bits of the fraction */
- /* are dropped this is correct to within a factor of almost 4. */
- /* For example, 0x80.0000 * 0x80.0000 = 0x4000.0000 is 23+23 and */
- /* is flagged as possible overflow because 0xFF.FFFF * 0xFF.FFFF = */
- /* 0xFFFF.FE00 is also 23+23. */
-
- logBase2 = FT_MSB( (FT_UInt32)stemWidthPer1000 ) +
- FT_MSB( (FT_UInt32)ppem );
-
- if ( logBase2 >= 46 )
- /* possible overflow */
- scaledStem = cf2_intToFixed( x4 );
- else
- scaledStem = FT_MulFix( stemWidthPer1000, ppem );
-
- /* now apply the darkening parameters */
-
- if ( scaledStem < cf2_intToFixed( x1 ) )
- *darkenAmount = FT_DivFix( cf2_intToFixed( y1 ), ppem );
-
- else if ( scaledStem < cf2_intToFixed( x2 ) )
- {
- FT_Int xdelta = x2 - x1;
- FT_Int ydelta = y2 - y1;
- FT_Int x = stemWidthPer1000 -
- FT_DivFix( cf2_intToFixed( x1 ), ppem );
-
-
- if ( !xdelta )
- goto Try_x3;
-
- *darkenAmount = FT_MulDiv( x, ydelta, xdelta ) +
- FT_DivFix( cf2_intToFixed( y1 ), ppem );
- }
-
- else if ( scaledStem < cf2_intToFixed( x3 ) )
- {
- Try_x3:
- {
- FT_Int xdelta = x3 - x2;
- FT_Int ydelta = y3 - y2;
- FT_Int x = stemWidthPer1000 -
- FT_DivFix( cf2_intToFixed( x2 ), ppem );
-
-
- if ( !xdelta )
- goto Try_x4;
-
- *darkenAmount = FT_MulDiv( x, ydelta, xdelta ) +
- FT_DivFix( cf2_intToFixed( y2 ), ppem );
- }
- }
-
- else if ( scaledStem < cf2_intToFixed( x4 ) )
- {
- Try_x4:
- {
- FT_Int xdelta = x4 - x3;
- FT_Int ydelta = y4 - y3;
- FT_Int x = stemWidthPer1000 -
- FT_DivFix( cf2_intToFixed( x3 ), ppem );
-
-
- if ( !xdelta )
- goto Use_y4;
-
- *darkenAmount = FT_MulDiv( x, ydelta, xdelta ) +
- FT_DivFix( cf2_intToFixed( y3 ), ppem );
- }
- }
-
- else
- {
- Use_y4:
- *darkenAmount = FT_DivFix( cf2_intToFixed( y4 ), ppem );
- }
-
- /* use half the amount on each side and convert back to true */
- /* character space */
- *darkenAmount = FT_DivFix( *darkenAmount, 2 * emRatio );
- }
-
- /* add synthetic emboldening effect in character space */
- *darkenAmount += boldenAmount / 2;
- }
-
-
- /* set up values for the current FontDict and matrix; */
- /* called for each glyph to be rendered */
-
- /* caller's transform is adjusted for subpixel positioning */
- static void
- cf2_font_setup( CF2_Font font,
- const CF2_Matrix* transform )
- {
- /* pointer to parsed font object */
- CFF_Decoder* decoder = font->decoder;
-
- FT_Bool needExtraSetup = FALSE;
-
- CFF_VStoreRec* vstore;
- FT_Bool hasVariations = FALSE;
-
- /* character space units */
- CF2_Fixed boldenX = font->syntheticEmboldeningAmountX;
- CF2_Fixed boldenY = font->syntheticEmboldeningAmountY;
-
- CFF_SubFont subFont;
- CF2_Fixed ppem;
-
- CF2_UInt lenNormalizedV = 0;
- FT_Fixed* normalizedV = NULL;
-
-
- /* clear previous error */
- font->error = FT_Err_Ok;
-
- /* if a CID fontDict has changed, we need to recompute some cached */
- /* data */
- subFont = cf2_getSubfont( decoder );
- if ( font->lastSubfont != subFont )
- {
- font->lastSubfont = subFont;
- needExtraSetup = TRUE;
- }
-
- /* check for variation vectors */
- vstore = cf2_getVStore( decoder );
- hasVariations = ( vstore->dataCount != 0 );
-
- if ( hasVariations )
- {
-#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
- /* check whether Private DICT in this subfont needs to be reparsed */
- font->error = cf2_getNormalizedVector( decoder,
- &lenNormalizedV,
- &normalizedV );
- if ( font->error )
- return;
-
- if ( cff_blend_check_vector( &subFont->blend,
- subFont->private_dict.vsindex,
- lenNormalizedV,
- normalizedV ) )
- {
- /* blend has changed, reparse */
- cff_load_private_dict( decoder->cff,
- subFont,
- lenNormalizedV,
- normalizedV );
- needExtraSetup = TRUE;
- }
-#endif
-
- /* copy from subfont */
- font->blend.font = subFont->blend.font;
-
- /* clear state of charstring blend */
- font->blend.usedBV = FALSE;
-
- /* initialize value for charstring */
- font->vsindex = subFont->private_dict.vsindex;
-
- /* store vector inputs for blends in charstring */
- font->lenNDV = lenNormalizedV;
- font->NDV = normalizedV;
- }
-
- /* if ppem has changed, we need to recompute some cached data */
- /* note: because of CID font matrix concatenation, ppem and transform */
- /* do not necessarily track. */
- ppem = cf2_getPpemY( decoder );
- if ( font->ppem != ppem )
- {
- font->ppem = ppem;
- needExtraSetup = TRUE;
- }
-
- /* copy hinted flag on each call */
- font->hinted = (FT_Bool)( font->renderingFlags & CF2_FlagsHinted );
-
- /* determine if transform has changed; */
- /* include Fontmatrix but ignore translation */
- if ( ft_memcmp( transform,
- &font->currentTransform,
- 4 * sizeof ( CF2_Fixed ) ) != 0 )
- {
- /* save `key' information for `cache of one' matrix data; */
- /* save client transform, without the translation */
- font->currentTransform = *transform;
- font->currentTransform.tx =
- font->currentTransform.ty = cf2_intToFixed( 0 );
-
- /* TODO: FreeType transform is simple scalar; for now, use identity */
- /* for outer */
- font->innerTransform = *transform;
- font->outerTransform.a =
- font->outerTransform.d = cf2_intToFixed( 1 );
- font->outerTransform.b =
- font->outerTransform.c = cf2_intToFixed( 0 );
-
- needExtraSetup = TRUE;
- }
-
- /*
- * font->darkened is set to true if there is a stem darkening request or
- * the font is synthetic emboldened.
- * font->darkened controls whether to adjust blue zones, winding order,
- * and hinting.
- *
- */
- if ( font->stemDarkened != ( font->renderingFlags & CF2_FlagsDarkened ) )
- {
- font->stemDarkened =
- (FT_Bool)( font->renderingFlags & CF2_FlagsDarkened );
-
- /* blue zones depend on darkened flag */
- needExtraSetup = TRUE;
- }
-
- /* recompute variables that are dependent on transform or FontDict or */
- /* darken flag */
- if ( needExtraSetup )
- {
- /* StdVW is found in the private dictionary; */
- /* recompute darkening amounts whenever private dictionary or */
- /* transform change */
- /* Note: a rendering flag turns darkening on or off, so we want to */
- /* store the `on' amounts; */
- /* darkening amount is computed in character space */
- /* TODO: testing size-dependent darkening here; */
- /* what to do for rotations? */
-
- CF2_Fixed emRatio;
- CF2_Fixed stdHW;
- CF2_Int unitsPerEm = font->unitsPerEm;
-
-
- if ( unitsPerEm == 0 )
- unitsPerEm = 1000;
-
- ppem = FT_MAX( cf2_intToFixed( 4 ),
- font->ppem ); /* use minimum ppem of 4 */
-
-#if 0
- /* since vstem is measured in the x-direction, we use the `a' member */
- /* of the fontMatrix */
- emRatio = cf2_fixedFracMul( cf2_intToFixed( 1000 ), fontMatrix->a );
-#endif
-
- /* Freetype does not preserve the fontMatrix when parsing; use */
- /* unitsPerEm instead. */
- /* TODO: check precision of this */
- emRatio = cf2_intToFixed( 1000 ) / unitsPerEm;
- font->stdVW = cf2_getStdVW( decoder );
-
- if ( font->stdVW <= 0 )
- font->stdVW = FT_DivFix( cf2_intToFixed( 75 ), emRatio );
-
- if ( boldenX > 0 )
- {
- /* Ensure that boldenX is at least 1 pixel for synthetic bold font */
- /* (similar to what Avalon does) */
- boldenX = FT_MAX( boldenX,
- FT_DivFix( cf2_intToFixed( unitsPerEm ), ppem ) );
-
- /* Synthetic emboldening adds at least 1 pixel to darkenX, while */
- /* stem darkening adds at most half pixel. Since the purpose of */
- /* stem darkening (readability at small sizes) is met with */
- /* synthetic emboldening, no need to add stem darkening for a */
- /* synthetic bold font. */
- cf2_computeDarkening( emRatio,
- ppem,
- font->stdVW,
- &font->darkenX,
- boldenX,
- FALSE,
- font->darkenParams );
- }
- else
- cf2_computeDarkening( emRatio,
- ppem,
- font->stdVW,
- &font->darkenX,
- 0,
- font->stemDarkened,
- font->darkenParams );
-
-#if 0
- /* since hstem is measured in the y-direction, we use the `d' member */
- /* of the fontMatrix */
- /* TODO: use the same units per em as above; check this */
- emRatio = cf2_fixedFracMul( cf2_intToFixed( 1000 ), fontMatrix->d );
-#endif
-
- /* set the default stem width, because it must be the same for all */
- /* family members; */
- /* choose a constant for StdHW that depends on font contrast */
- stdHW = cf2_getStdHW( decoder );
-
- if ( stdHW > 0 && font->stdVW > MUL_INT32( 2, stdHW ) )
- font->stdHW = FT_DivFix( cf2_intToFixed( 75 ), emRatio );
- else
- {
- /* low contrast font gets less hstem darkening */
- font->stdHW = FT_DivFix( cf2_intToFixed( 110 ), emRatio );
- }
-
- cf2_computeDarkening( emRatio,
- ppem,
- font->stdHW,
- &font->darkenY,
- boldenY,
- font->stemDarkened,
- font->darkenParams );
-
- if ( font->darkenX != 0 || font->darkenY != 0 )
- font->darkened = TRUE;
- else
- font->darkened = FALSE;
-
- font->reverseWinding = FALSE; /* initial expectation is CCW */
-
- /* compute blue zones for this instance */
- cf2_blues_init( &font->blues, font );
-
- } /* needExtraSetup */
- }
-
-
- /* equivalent to AdobeGetOutline */
- FT_LOCAL_DEF( FT_Error )
- cf2_getGlyphOutline( CF2_Font font,
- CF2_Buffer charstring,
- const CF2_Matrix* transform,
- CF2_F16Dot16* glyphWidth )
- {
- FT_Error lastError = FT_Err_Ok;
-
- FT_Vector translation;
-
-#if 0
- FT_Vector advancePoint;
-#endif
-
- CF2_Fixed advWidth = 0;
- FT_Bool needWinding;
-
-
- /* Note: use both integer and fraction for outlines. This allows bbox */
- /* to come out directly. */
-
- translation.x = transform->tx;
- translation.y = transform->ty;
-
- /* set up values based on transform */
- cf2_font_setup( font, transform );
- if ( font->error )
- goto exit; /* setup encountered an error */
-
- /* reset darken direction */
- font->reverseWinding = FALSE;
-
- /* winding order only affects darkening */
- needWinding = font->darkened;
-
- while ( 1 )
- {
- /* reset output buffer */
- cf2_outline_reset( &font->outline );
-
- /* build the outline, passing the full translation */
- cf2_interpT2CharString( font,
- charstring,
- (CF2_OutlineCallbacks)&font->outline,
- &translation,
- FALSE,
- 0,
- 0,
- &advWidth );
-
- if ( font->error )
- goto exit;
-
- if ( !needWinding )
- break;
-
- /* check winding order */
- if ( font->outline.root.windingMomentum >= 0 ) /* CFF is CCW */
- break;
-
- /* invert darkening and render again */
- /* TODO: this should be a parameter to getOutline-computeOffset */
- font->reverseWinding = TRUE;
-
- needWinding = FALSE; /* exit after next iteration */
- }
-
- /* finish storing client outline */
- cf2_outline_close( &font->outline );
-
- exit:
- /* FreeType just wants the advance width; there is no translation */
- *glyphWidth = advWidth;
-
- /* free resources and collect errors from objects we've used */
- cf2_setError( &font->error, lastError );
-
- return font->error;
- }
-
-
-/* END */
projects / reactos.git / blobdiff