| /***************************************************************************/ |
| /* */ |
| /* 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; |
| } |
| |
| |
| /* 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; |
| } |
| |
| |
| /* 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 */ |
