📄 ttgload.c
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}
}
/* Set `offset' to the start of the glyph relative to the start of */
/* the `glyf' table, and `byte_len' to the length of the glyph in */
/* bytes. */
#ifdef FT_CONFIG_OPTION_INCREMENTAL
/* If we are loading glyph data via the incremental interface, set */
/* the loader stream to a memory stream reading the data returned */
/* by the interface. */
if ( face->root.internal->incremental_interface )
{
error = face->root.internal->incremental_interface->funcs->get_glyph_data(
face->root.internal->incremental_interface->object,
glyph_index, &glyph_data );
if ( error )
goto Exit;
glyph_data_loaded = 1;
offset = 0;
loader->byte_len = glyph_data.length;
FT_MEM_ZERO( &inc_stream, sizeof ( inc_stream ) );
FT_Stream_OpenMemory( &inc_stream,
glyph_data.pointer, glyph_data.length );
loader->stream = &inc_stream;
}
else
#endif /* FT_CONFIG_OPTION_INCREMENTAL */
offset = tt_face_get_location( face, glyph_index,
(FT_UInt*)&loader->byte_len );
if ( loader->byte_len == 0 )
{
/* as described by Frederic Loyer, these are spaces or */
/* the unknown glyph. */
loader->bbox.xMin = 0;
loader->bbox.xMax = 0;
loader->bbox.yMin = 0;
loader->bbox.yMax = 0;
TT_LOADER_SET_PP( loader );
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
if ( ((TT_Face)(loader->face))->doblend )
{
/* this must be done before scaling */
FT_Memory memory = loader->face->memory;
error = TT_Vary_Get_Glyph_Deltas( (TT_Face)(loader->face),
glyph_index, &deltas, 4 );
if ( error )
goto Exit;
loader->pp1.x += deltas[0].x; loader->pp1.y += deltas[0].y;
loader->pp2.x += deltas[1].x; loader->pp2.y += deltas[1].y;
loader->pp3.x += deltas[2].x; loader->pp3.y += deltas[2].y;
loader->pp4.x += deltas[3].x; loader->pp4.y += deltas[3].y;
FT_FREE( deltas );
}
#endif
if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
{
loader->pp1.x = FT_MulFix( loader->pp1.x, x_scale );
loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale );
loader->pp3.y = FT_MulFix( loader->pp3.y, y_scale );
loader->pp4.y = FT_MulFix( loader->pp4.y, y_scale );
}
error = TT_Err_Ok;
goto Exit;
}
error = face->access_glyph_frame( loader, glyph_index,
loader->glyf_offset + offset,
loader->byte_len );
if ( error )
goto Exit;
opened_frame = 1;
/* read first glyph header */
error = face->read_glyph_header( loader );
if ( error )
goto Exit;
TT_LOADER_SET_PP( loader );
/***********************************************************************/
/***********************************************************************/
/***********************************************************************/
/* if it is a simple glyph, load it */
if ( loader->n_contours >= 0 )
{
error = face->read_simple_glyph( loader );
if ( error )
goto Exit;
/* all data have been read */
face->forget_glyph_frame( loader );
opened_frame = 0;
error = TT_Process_Simple_Glyph( loader );
if ( error )
goto Exit;
FT_GlyphLoader_Add( gloader );
}
/***********************************************************************/
/***********************************************************************/
/***********************************************************************/
/* otherwise, load a composite! */
else if ( loader->n_contours == -1 )
{
FT_UInt start_point;
FT_UInt start_contour;
FT_ULong ins_pos; /* position of composite instructions, if any */
start_point = gloader->base.outline.n_points;
start_contour = gloader->base.outline.n_contours;
/* for each subglyph, read composite header */
error = face->read_composite_glyph( loader );
if ( error )
goto Exit;
/* store the offset of instructions */
ins_pos = loader->ins_pos;
/* all data we need are read */
face->forget_glyph_frame( loader );
opened_frame = 0;
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
if ( face->doblend )
{
FT_Int i, limit;
FT_SubGlyph subglyph;
FT_Memory memory = face->root.memory;
/* this provides additional offsets */
/* for each component's translation */
if ( (error = TT_Vary_Get_Glyph_Deltas(
face,
glyph_index,
&deltas,
gloader->current.num_subglyphs + 4 )) != 0 )
goto Exit;
subglyph = gloader->current.subglyphs + gloader->base.num_subglyphs;
limit = gloader->current.num_subglyphs;
for ( i = 0; i < limit; ++i, ++subglyph )
{
if ( subglyph->flags & ARGS_ARE_XY_VALUES )
{
subglyph->arg1 += deltas[i].x;
subglyph->arg2 += deltas[i].y;
}
}
loader->pp1.x += deltas[i + 0].x; loader->pp1.y += deltas[i + 0].y;
loader->pp2.x += deltas[i + 1].x; loader->pp2.y += deltas[i + 1].y;
loader->pp3.x += deltas[i + 2].x; loader->pp3.y += deltas[i + 2].y;
loader->pp4.x += deltas[i + 3].x; loader->pp4.y += deltas[i + 3].y;
FT_FREE( deltas );
}
#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */
if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
{
loader->pp1.x = FT_MulFix( loader->pp1.x, x_scale );
loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale );
loader->pp3.y = FT_MulFix( loader->pp3.y, y_scale );
loader->pp4.y = FT_MulFix( loader->pp4.y, y_scale );
}
/* if the flag FT_LOAD_NO_RECURSE is set, we return the subglyph */
/* `as is' in the glyph slot (the client application will be */
/* responsible for interpreting these data)... */
/* */
if ( loader->load_flags & FT_LOAD_NO_RECURSE )
{
FT_GlyphLoader_Add( gloader );
loader->glyph->format = FT_GLYPH_FORMAT_COMPOSITE;
goto Exit;
}
/*********************************************************************/
/*********************************************************************/
/*********************************************************************/
{
FT_UInt n, num_base_points;
FT_SubGlyph subglyph = 0;
FT_UInt num_points = start_point;
FT_UInt num_subglyphs = gloader->current.num_subglyphs;
FT_UInt num_base_subgs = gloader->base.num_subglyphs;
FT_GlyphLoader_Add( gloader );
/* read each subglyph independently */
for ( n = 0; n < num_subglyphs; n++ )
{
FT_Vector pp[4];
/* Each time we call load_truetype_glyph in this loop, the */
/* value of `gloader.base.subglyphs' can change due to table */
/* reallocations. We thus need to recompute the subglyph */
/* pointer on each iteration. */
subglyph = gloader->base.subglyphs + num_base_subgs + n;
pp[0] = loader->pp1;
pp[1] = loader->pp2;
pp[2] = loader->pp3;
pp[3] = loader->pp4;
num_base_points = gloader->base.outline.n_points;
error = load_truetype_glyph( loader, subglyph->index,
recurse_count + 1 );
if ( error )
goto Exit;
/* restore subglyph pointer */
subglyph = gloader->base.subglyphs + num_base_subgs + n;
if ( !( subglyph->flags & USE_MY_METRICS ) )
{
loader->pp1 = pp[0];
loader->pp2 = pp[1];
loader->pp3 = pp[2];
loader->pp4 = pp[3];
}
num_points = gloader->base.outline.n_points;
if ( num_points == num_base_points )
continue;
/* gloader->base.outline consists of three part: */
/* 0 -(1)-> start_point -(2)-> num_base_points -(3)-> n_points. */
/* */
/* (1): exist from the beginning */
/* (2): components that have been loaded so far */
/* (3): the newly loaded component */
TT_Process_Composite_Component( loader, subglyph, start_point,
num_base_points );
}
/* process the glyph */
loader->ins_pos = ins_pos;
if ( IS_HINTED( loader->load_flags ) &&
#ifdef TT_USE_BYTECODE_INTERPRETER
subglyph->flags & WE_HAVE_INSTR &&
#endif
num_points > start_point )
TT_Process_Composite_Glyph( loader, start_point, start_contour );
}
}
else
{
/* invalid composite count ( negative but not -1 ) */
error = TT_Err_Invalid_Outline;
goto Exit;
}
/***********************************************************************/
/***********************************************************************/
/***********************************************************************/
Exit:
if ( opened_frame )
face->forget_glyph_frame( loader );
#ifdef FT_CONFIG_OPTION_INCREMENTAL
if ( glyph_data_loaded )
face->root.internal->incremental_interface->funcs->free_glyph_data(
face->root.internal->incremental_interface->object,
&glyph_data );
#endif
return error;
}
static FT_Error
compute_glyph_metrics( TT_Loader loader,
FT_UInt glyph_index )
{
FT_BBox bbox;
TT_Face face = (TT_Face)loader->face;
FT_Fixed y_scale;
TT_GlyphSlot glyph = loader->glyph;
TT_Size size = (TT_Size)loader->size;
y_scale = 0x10000L;
if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
y_scale = size->root.metrics.y_scale;
if ( glyph->format != FT_GLYPH_FORMAT_COMPOSITE )
FT_Outline_Get_CBox( &glyph->outline, &bbox );
else
bbox = loader->bbox;
/* get the device-independent horizontal advance. It is scaled later */
/* by the base layer. */
{
FT_Pos advance = loader->linear;
/* the flag FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH was introduced to */
/* correctly support DynaLab fonts, which have an incorrect */
/* `advance_Width_Max' field! It is used, to my knowledge, */
/* exclusively in the X-TrueType font server. */
/* */
if ( face->postscript.isFixedPitch &&
( loader->load_flags & FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ) == 0 )
advance = face->horizontal.advance_Width_Max;
/* we need to return the advance in font units in linearHoriAdvance, */
/* it will be scaled later by the base layer. */
glyph->linearHoriAdvance = advance;
}
glyph->metrics.horiBearingX = bbox.xMin;
glyph->metrics.horiBearingY = bbox.yMax;
glyph->metrics.horiAdvance = loader->pp2.x - loader->pp1.x;
/* Now take care of vertical metrics. In the case where there is */
/* no vertical information within the font (relatively common), make */
/* up some metrics by `hand'... */
{
FT_Pos top; /* scaled vertical top side bearing */
FT_Pos advance; /* scaled vertical advance height */
/* Get the unscaled top bearing and advance height. */
if ( face->vertical_info &&
face->vertical.number_Of_VMetrics > 0 )
{
top = (FT_Short)FT_DivFix( loader->pp3.y - bbox.yMax,
y_scale );
if ( loader->pp3.y <= loader->pp4.y )
advance = 0;
else
advance = (FT_UShort)FT_DivFix( loader->pp3.y - loader->pp4.y,
y_scale );
}
else
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