ref: 1f377f0d50a6a4bdf2a4985a010af0403925681f
dir: /src/autofit/afloader.c/
/***************************************************************************/
/* */
/* afloader.c */
/* */
/* Auto-fitter glyph loading routines (body). */
/* */
/* Copyright 2003-2015 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
/* modified, and distributed under the terms of the FreeType project */
/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
/* this file you indicate that you have read the license and */
/* understand and accept it fully. */
/* */
/***************************************************************************/
#include "afglobal.h"
#include "afloader.h"
#include "afhints.h"
#include "aferrors.h"
#include "afmodule.h"
#include "afpic.h"
/* Initialize glyph loader. */
FT_LOCAL_DEF( void )
af_loader_init( AF_Loader loader,
AF_GlyphHints hints )
{
FT_ZERO( loader );
loader->hints = hints;
#ifdef FT_DEBUG_AUTOFIT
_af_debug_hints = loader->hints;
#endif
}
/* Reset glyph loader and compute globals if necessary. */
FT_LOCAL_DEF( FT_Error )
af_loader_reset( AF_Loader loader,
AF_Module module,
FT_Face face )
{
FT_Error error = FT_Err_Ok;
loader->face = face;
loader->globals = (AF_FaceGlobals)face->autohint.data;
if ( loader->globals == NULL )
{
error = af_face_globals_new( face, &loader->globals, module );
if ( !error )
{
face->autohint.data =
(FT_Pointer)loader->globals;
face->autohint.finalizer =
(FT_Generic_Finalizer)af_face_globals_free;
}
}
return error;
}
/* Finalize glyph loader. */
FT_LOCAL_DEF( void )
af_loader_done( AF_Loader loader )
{
loader->face = NULL;
loader->globals = NULL;
loader->hints = NULL;
#ifdef FT_DEBUG_AUTOFIT
_af_debug_hints = NULL;
#endif
}
/* Do the main work of `af_loader_load_glyph'. Note that we never */
/* have to deal with composite glyphs as those get loaded into */
/* FT_GLYPH_FORMAT_OUTLINE by the recursed `FT_Load_Glyph' function. */
/* In the rare cases where FT_LOAD_NO_RECURSE is set, it implies */
/* FT_LOAD_NO_SCALE and as such the auto-hinter is never called. */
static FT_Error
af_loader_load_g( AF_Loader loader,
AF_Scaler scaler,
FT_UInt glyph_index,
FT_Int32 load_flags )
{
FT_Error error;
FT_Face face = loader->face;
AF_StyleMetrics metrics = loader->metrics;
AF_GlyphHints hints = loader->hints;
FT_GlyphSlot slot = face->glyph;
FT_Slot_Internal internal = slot->internal;
FT_GlyphLoader gloader = internal->loader;
FT_Int32 flags;
flags = load_flags | FT_LOAD_LINEAR_DESIGN;
error = FT_Load_Glyph( face, glyph_index, flags );
if ( error )
goto Exit;
loader->transformed = internal->glyph_transformed;
if ( loader->transformed )
{
FT_Matrix inverse;
loader->trans_matrix = internal->glyph_matrix;
loader->trans_delta = internal->glyph_delta;
inverse = loader->trans_matrix;
if ( !FT_Matrix_Invert( &inverse ) )
FT_Vector_Transform( &loader->trans_delta, &inverse );
}
switch ( slot->format )
{
case FT_GLYPH_FORMAT_OUTLINE:
/* translate the loaded glyph when an internal transform is needed */
if ( loader->transformed )
FT_Outline_Translate( &slot->outline,
loader->trans_delta.x,
loader->trans_delta.y );
/* compute original horizontal phantom points (and ignore */
/* vertical ones) */
loader->pp1.x = hints->x_delta;
loader->pp1.y = hints->y_delta;
loader->pp2.x = FT_MulFix( slot->metrics.horiAdvance,
hints->x_scale ) + hints->x_delta;
loader->pp2.y = hints->y_delta;
/* be sure to check for spacing glyphs */
if ( slot->outline.n_points == 0 )
goto Hint_Metrics;
/* now load the slot image into the auto-outline and run the */
/* automatic hinting process */
{
#ifdef FT_CONFIG_OPTION_PIC
AF_FaceGlobals globals = loader->globals;
#endif
AF_StyleClass style_class = metrics->style_class;
AF_WritingSystemClass writing_system_class =
AF_WRITING_SYSTEM_CLASSES_GET[style_class->writing_system];
if ( writing_system_class->style_hints_apply )
writing_system_class->style_hints_apply( hints,
&gloader->base.outline,
metrics );
}
/* we now need to adjust the metrics according to the change in */
/* width/positioning that occurred during the hinting process */
if ( scaler->render_mode != FT_RENDER_MODE_LIGHT )
{
FT_Pos old_rsb, old_lsb, new_lsb;
FT_Pos pp1x_uh, pp2x_uh;
AF_AxisHints axis = &hints->axis[AF_DIMENSION_HORZ];
AF_Edge edge1 = axis->edges; /* leftmost edge */
AF_Edge edge2 = edge1 +
axis->num_edges - 1; /* rightmost edge */
if ( axis->num_edges > 1 && AF_HINTS_DO_ADVANCE( hints ) )
{
old_rsb = loader->pp2.x - edge2->opos;
old_lsb = edge1->opos;
new_lsb = edge1->pos;
/* remember unhinted values to later account */
/* for rounding errors */
pp1x_uh = new_lsb - old_lsb;
pp2x_uh = edge2->pos + old_rsb;
/* prefer too much space over too little space */
/* for very small sizes */
if ( old_lsb < 24 )
pp1x_uh -= 8;
if ( old_rsb < 24 )
pp2x_uh += 8;
loader->pp1.x = FT_PIX_ROUND( pp1x_uh );
loader->pp2.x = FT_PIX_ROUND( pp2x_uh );
if ( loader->pp1.x >= new_lsb && old_lsb > 0 )
loader->pp1.x -= 64;
if ( loader->pp2.x <= edge2->pos && old_rsb > 0 )
loader->pp2.x += 64;
slot->lsb_delta = loader->pp1.x - pp1x_uh;
slot->rsb_delta = loader->pp2.x - pp2x_uh;
}
else
{
FT_Pos pp1x = loader->pp1.x;
FT_Pos pp2x = loader->pp2.x;
loader->pp1.x = FT_PIX_ROUND( pp1x );
loader->pp2.x = FT_PIX_ROUND( pp2x );
slot->lsb_delta = loader->pp1.x - pp1x;
slot->rsb_delta = loader->pp2.x - pp2x;
}
}
else
{
FT_Pos pp1x = loader->pp1.x;
FT_Pos pp2x = loader->pp2.x;
loader->pp1.x = FT_PIX_ROUND( pp1x + hints->xmin_delta );
loader->pp2.x = FT_PIX_ROUND( pp2x + hints->xmax_delta );
slot->lsb_delta = loader->pp1.x - pp1x;
slot->rsb_delta = loader->pp2.x - pp2x;
}
break;
default:
/* we don't support other formats (yet?) */
error = FT_THROW( Unimplemented_Feature );
}
Hint_Metrics:
{
FT_BBox bbox;
FT_Vector vvector;
vvector.x = slot->metrics.vertBearingX - slot->metrics.horiBearingX;
vvector.y = slot->metrics.vertBearingY - slot->metrics.horiBearingY;
vvector.x = FT_MulFix( vvector.x, metrics->scaler.x_scale );
vvector.y = FT_MulFix( vvector.y, metrics->scaler.y_scale );
/* transform the hinted outline if needed */
if ( loader->transformed )
{
FT_Outline_Transform( &gloader->base.outline, &loader->trans_matrix );
FT_Vector_Transform( &vvector, &loader->trans_matrix );
}
#if 1
/* we must translate our final outline by -pp1.x and compute */
/* the new metrics */
if ( loader->pp1.x )
FT_Outline_Translate( &gloader->base.outline, -loader->pp1.x, 0 );
#endif
FT_Outline_Get_CBox( &gloader->base.outline, &bbox );
bbox.xMin = FT_PIX_FLOOR( bbox.xMin );
bbox.yMin = FT_PIX_FLOOR( bbox.yMin );
bbox.xMax = FT_PIX_CEIL( bbox.xMax );
bbox.yMax = FT_PIX_CEIL( bbox.yMax );
slot->metrics.width = bbox.xMax - bbox.xMin;
slot->metrics.height = bbox.yMax - bbox.yMin;
slot->metrics.horiBearingX = bbox.xMin;
slot->metrics.horiBearingY = bbox.yMax;
slot->metrics.vertBearingX = FT_PIX_FLOOR( bbox.xMin + vvector.x );
slot->metrics.vertBearingY = FT_PIX_FLOOR( bbox.yMax + vvector.y );
/* for mono-width fonts (like Andale, Courier, etc.) we need */
/* to keep the original rounded advance width; ditto for */
/* digits if all have the same advance width */
#if 0
if ( !FT_IS_FIXED_WIDTH( slot->face ) )
slot->metrics.horiAdvance = loader->pp2.x - loader->pp1.x;
else
slot->metrics.horiAdvance = FT_MulFix( slot->metrics.horiAdvance,
x_scale );
#else
if ( scaler->render_mode != FT_RENDER_MODE_LIGHT &&
( FT_IS_FIXED_WIDTH( slot->face ) ||
( af_face_globals_is_digit( loader->globals, glyph_index ) &&
metrics->digits_have_same_width ) ) )
{
slot->metrics.horiAdvance = FT_MulFix( slot->metrics.horiAdvance,
metrics->scaler.x_scale );
/* Set delta values to 0. Otherwise code that uses them is */
/* going to ruin the fixed advance width. */
slot->lsb_delta = 0;
slot->rsb_delta = 0;
}
else
{
/* non-spacing glyphs must stay as-is */
if ( slot->metrics.horiAdvance )
slot->metrics.horiAdvance = loader->pp2.x - loader->pp1.x;
}
#endif
slot->metrics.vertAdvance = FT_MulFix( slot->metrics.vertAdvance,
metrics->scaler.y_scale );
slot->metrics.horiAdvance = FT_PIX_ROUND( slot->metrics.horiAdvance );
slot->metrics.vertAdvance = FT_PIX_ROUND( slot->metrics.vertAdvance );
#if 0
/* reassign all outline fields except flags to protect them */
slot->outline.n_contours = internal->loader->base.outline.n_contours;
slot->outline.n_points = internal->loader->base.outline.n_points;
slot->outline.points = internal->loader->base.outline.points;
slot->outline.tags = internal->loader->base.outline.tags;
slot->outline.contours = internal->loader->base.outline.contours;
#endif
slot->format = FT_GLYPH_FORMAT_OUTLINE;
}
Exit:
return error;
}
/* Load a glyph. */
FT_LOCAL_DEF( FT_Error )
af_loader_load_glyph( AF_Loader loader,
AF_Module module,
FT_Face face,
FT_UInt gindex,
FT_Int32 load_flags )
{
FT_Error error;
FT_Size size = face->size;
AF_ScalerRec scaler;
if ( !size )
return FT_THROW( Invalid_Size_Handle );
FT_ZERO( &scaler );
scaler.face = face;
scaler.x_scale = size->metrics.x_scale;
scaler.x_delta = 0; /* XXX: TODO: add support for sub-pixel hinting */
scaler.y_scale = size->metrics.y_scale;
scaler.y_delta = 0; /* XXX: TODO: add support for sub-pixel hinting */
scaler.render_mode = FT_LOAD_TARGET_MODE( load_flags );
scaler.flags = 0; /* XXX: fix this */
error = af_loader_reset( loader, module, face );
if ( !error )
{
AF_StyleMetrics metrics;
FT_UInt options = AF_STYLE_NONE_DFLT;
#ifdef FT_OPTION_AUTOFIT2
/* XXX: undocumented hook to activate the latin2 writing system */
if ( load_flags & ( 1UL << 20 ) )
options = AF_STYLE_LTN2_DFLT;
#endif
error = af_face_globals_get_metrics( loader->globals, gindex,
options, &metrics );
if ( !error )
{
#ifdef FT_CONFIG_OPTION_PIC
AF_FaceGlobals globals = loader->globals;
#endif
AF_StyleClass style_class = metrics->style_class;
AF_WritingSystemClass writing_system_class =
AF_WRITING_SYSTEM_CLASSES_GET[style_class->writing_system];
loader->metrics = metrics;
if ( writing_system_class->style_metrics_scale )
writing_system_class->style_metrics_scale( metrics, &scaler );
else
metrics->scaler = scaler;
load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_IGNORE_TRANSFORM;
load_flags &= ~FT_LOAD_RENDER;
if ( writing_system_class->style_hints_init )
{
error = writing_system_class->style_hints_init( loader->hints,
metrics );
if ( error )
goto Exit;
}
error = af_loader_load_g( loader, &scaler, gindex, load_flags );
}
}
Exit:
return error;
}
/* END */