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-rw-r--r--src/autofit/afloader.c530
1 files changed, 530 insertions, 0 deletions
diff --git a/src/autofit/afloader.c b/src/autofit/afloader.c
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+++ b/src/autofit/afloader.c
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+/***************************************************************************/
+/* */
+/* afloader.c */
+/* */
+/* Auto-fitter glyph loading routines (body). */
+/* */
+/* Copyright 2003, 2004, 2005, 2006, 2007 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 "afloader.h"
+#include "afhints.h"
+#include "afglobal.h"
+#include "aflatin.h"
+#include "aferrors.h"
+
+
+ FT_LOCAL_DEF( FT_Error )
+ af_loader_init( AF_Loader loader,
+ FT_Memory memory )
+ {
+ FT_ZERO( loader );
+
+ af_glyph_hints_init( &loader->hints, memory );
+#ifdef AF_DEBUG
+ _af_debug_hints = &loader->hints;
+#endif
+ return FT_GlyphLoader_New( memory, &loader->gloader );
+ }
+
+
+ FT_LOCAL_DEF( FT_Error )
+ af_loader_reset( AF_Loader loader,
+ FT_Face face )
+ {
+ FT_Error error = AF_Err_Ok;
+
+
+ loader->face = face;
+ loader->globals = (AF_FaceGlobals)face->autohint.data;
+
+ FT_GlyphLoader_Rewind( loader->gloader );
+
+ if ( loader->globals == NULL )
+ {
+ error = af_face_globals_new( face, &loader->globals );
+ if ( !error )
+ {
+ face->autohint.data =
+ (FT_Pointer)loader->globals;
+ face->autohint.finalizer =
+ (FT_Generic_Finalizer)af_face_globals_free;
+ }
+ }
+
+ return error;
+ }
+
+
+ FT_LOCAL_DEF( void )
+ af_loader_done( AF_Loader loader )
+ {
+ af_glyph_hints_done( &loader->hints );
+
+ loader->face = NULL;
+ loader->globals = NULL;
+
+#ifdef AF_DEBUG
+ _af_debug_hints = NULL;
+#endif
+ FT_GlyphLoader_Done( loader->gloader );
+ loader->gloader = NULL;
+ }
+
+
+ static FT_Error
+ af_loader_load_g( AF_Loader loader,
+ AF_Scaler scaler,
+ FT_UInt glyph_index,
+ FT_Int32 load_flags,
+ FT_UInt depth )
+ {
+ FT_Error error;
+ FT_Face face = loader->face;
+ FT_GlyphLoader gloader = loader->gloader;
+ AF_ScriptMetrics metrics = loader->metrics;
+ AF_GlyphHints hints = &loader->hints;
+ FT_GlyphSlot slot = face->glyph;
+ FT_Slot_Internal internal = slot->internal;
+
+
+ error = FT_Load_Glyph( face, glyph_index, load_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;
+ FT_Matrix_Invert( &inverse );
+ FT_Vector_Transform( &loader->trans_delta, &inverse );
+ }
+
+ /* set linear metrics */
+ slot->linearHoriAdvance = slot->metrics.horiAdvance;
+ slot->linearVertAdvance = slot->metrics.vertAdvance;
+
+ 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 );
+
+ /* copy the outline points in the loader's current */
+ /* extra points which is used to keep original glyph coordinates */
+ error = FT_GLYPHLOADER_CHECK_POINTS( gloader,
+ slot->outline.n_points + 4,
+ slot->outline.n_contours );
+ if ( error )
+ goto Exit;
+
+ FT_ARRAY_COPY( gloader->current.outline.points,
+ slot->outline.points,
+ slot->outline.n_points );
+
+ FT_ARRAY_COPY( gloader->current.outline.contours,
+ slot->outline.contours,
+ slot->outline.n_contours );
+
+ FT_ARRAY_COPY( gloader->current.outline.tags,
+ slot->outline.tags,
+ slot->outline.n_points );
+
+ gloader->current.outline.n_points = slot->outline.n_points;
+ gloader->current.outline.n_contours = slot->outline.n_contours;
+
+ /* 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 */
+ metrics->clazz->script_hints_apply( hints,
+ &gloader->current.outline,
+ metrics );
+
+ /* we now need to hint 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;
+ }
+
+ /* good, we simply add the glyph to our loader's base */
+ FT_GlyphLoader_Add( gloader );
+ break;
+
+ case FT_GLYPH_FORMAT_COMPOSITE:
+ {
+ FT_UInt nn, num_subglyphs = slot->num_subglyphs;
+ FT_UInt num_base_subgs, start_point;
+ FT_SubGlyph subglyph;
+
+
+ start_point = gloader->base.outline.n_points;
+
+ /* first of all, copy the subglyph descriptors in the glyph loader */
+ error = FT_GlyphLoader_CheckSubGlyphs( gloader, num_subglyphs );
+ if ( error )
+ goto Exit;
+
+ FT_ARRAY_COPY( gloader->current.subglyphs,
+ slot->subglyphs,
+ num_subglyphs );
+
+ gloader->current.num_subglyphs = num_subglyphs;
+ num_base_subgs = gloader->base.num_subglyphs;
+
+ /* now, read each subglyph independently */
+ for ( nn = 0; nn < num_subglyphs; nn++ )
+ {
+ FT_Vector pp1, pp2;
+ FT_Pos x, y;
+ FT_UInt num_points, num_new_points, num_base_points;
+
+
+ /* gloader.current.subglyphs can change during glyph loading due */
+ /* to re-allocation -- we must recompute the current subglyph on */
+ /* each iteration */
+ subglyph = gloader->base.subglyphs + num_base_subgs + nn;
+
+ pp1 = loader->pp1;
+ pp2 = loader->pp2;
+
+ num_base_points = gloader->base.outline.n_points;
+
+ error = af_loader_load_g( loader, scaler, subglyph->index,
+ load_flags, depth + 1 );
+ if ( error )
+ goto Exit;
+
+ /* recompute subglyph pointer */
+ subglyph = gloader->base.subglyphs + num_base_subgs + nn;
+
+ if ( subglyph->flags & FT_SUBGLYPH_FLAG_USE_MY_METRICS )
+ {
+ pp1 = loader->pp1;
+ pp2 = loader->pp2;
+ }
+ else
+ {
+ loader->pp1 = pp1;
+ loader->pp2 = pp2;
+ }
+
+ num_points = gloader->base.outline.n_points;
+ num_new_points = num_points - num_base_points;
+
+ /* now perform the transform required for this subglyph */
+
+ if ( subglyph->flags & ( FT_SUBGLYPH_FLAG_SCALE |
+ FT_SUBGLYPH_FLAG_XY_SCALE |
+ FT_SUBGLYPH_FLAG_2X2 ) )
+ {
+ FT_Vector* cur = gloader->base.outline.points +
+ num_base_points;
+ FT_Vector* limit = cur + num_new_points;
+
+
+ for ( ; cur < limit; cur++ )
+ FT_Vector_Transform( cur, &subglyph->transform );
+ }
+
+ /* apply offset */
+
+ if ( !( subglyph->flags & FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES ) )
+ {
+ FT_Int k = subglyph->arg1;
+ FT_UInt l = subglyph->arg2;
+ FT_Vector* p1;
+ FT_Vector* p2;
+
+
+ if ( start_point + k >= num_base_points ||
+ l >= (FT_UInt)num_new_points )
+ {
+ error = AF_Err_Invalid_Composite;
+ goto Exit;
+ }
+
+ l += num_base_points;
+
+ /* for now, only use the current point coordinates; */
+ /* we may consider another approach in the near future */
+ p1 = gloader->base.outline.points + start_point + k;
+ p2 = gloader->base.outline.points + start_point + l;
+
+ x = p1->x - p2->x;
+ y = p1->y - p2->y;
+ }
+ else
+ {
+ x = FT_MulFix( subglyph->arg1, hints->x_scale ) + hints->x_delta;
+ y = FT_MulFix( subglyph->arg2, hints->y_scale ) + hints->y_delta;
+
+ x = FT_PIX_ROUND( x );
+ y = FT_PIX_ROUND( y );
+ }
+
+ {
+ FT_Outline dummy = gloader->base.outline;
+
+
+ dummy.points += num_base_points;
+ dummy.n_points = (short)num_new_points;
+
+ FT_Outline_Translate( &dummy, x, y );
+ }
+ }
+ }
+ break;
+
+ default:
+ /* we don't support other formats (yet?) */
+ error = AF_Err_Unimplemented_Feature;
+ }
+
+ Hint_Metrics:
+ if ( depth == 0 )
+ {
+ 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 */
+#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 ( !FT_IS_FIXED_WIDTH( slot->face ) )
+ {
+ /* non-spacing glyphs must stay as-is */
+ if ( slot->metrics.horiAdvance )
+ slot->metrics.horiAdvance = loader->pp2.x - loader->pp1.x;
+ }
+ else
+ {
+ 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;
+ }
+#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 );
+
+ /* now copy outline into glyph slot */
+ FT_GlyphLoader_Rewind( internal->loader );
+ error = FT_GlyphLoader_CopyPoints( internal->loader, gloader );
+ if ( error )
+ goto Exit;
+
+ slot->outline = internal->loader->base.outline;
+ slot->format = FT_GLYPH_FORMAT_OUTLINE;
+ }
+
+#ifdef DEBUG_HINTER
+ af_debug_hinter = hinter;
+#endif
+
+ Exit:
+ return error;
+ }
+
+
+ FT_LOCAL_DEF( FT_Error )
+ af_loader_load_glyph( AF_Loader loader,
+ FT_Face face,
+ FT_UInt gindex,
+ FT_UInt32 load_flags )
+ {
+ FT_Error error;
+ FT_Size size = face->size;
+ AF_ScalerRec scaler;
+
+
+ if ( !size )
+ return AF_Err_Invalid_Argument;
+
+ 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, face );
+ if ( !error )
+ {
+ AF_ScriptMetrics metrics;
+ FT_UInt options = 0;
+
+
+#ifdef FT_OPTION_AUTOFIT2
+ /* XXX: undocumented hook to activate the latin2 hinter */
+ if ( load_flags & ( 1UL << 20 ) )
+ options = 2;
+#endif
+
+ error = af_face_globals_get_metrics( loader->globals, gindex,
+ options, &metrics );
+ if ( !error )
+ {
+ loader->metrics = metrics;
+
+ if ( metrics->clazz->script_metrics_scale )
+ metrics->clazz->script_metrics_scale( metrics, &scaler );
+ else
+ metrics->scaler = scaler;
+
+ load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_IGNORE_TRANSFORM;
+ load_flags &= ~FT_LOAD_RENDER;
+
+ error = metrics->clazz->script_hints_init( &loader->hints, metrics );
+ if ( error )
+ goto Exit;
+
+ error = af_loader_load_g( loader, &scaler, gindex, load_flags, 0 );
+ }
+ }
+ Exit:
+ return error;
+ }
+
+
+/* END */
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