📄 ttgload.c.old
字号:
/*************************************************************************/
/* */
/* <Function> */
/* TT_Process_Composite_Component */
/* */
/* <Description> */
/* Once a composite component has been loaded, it needs to be */
/* processed. Usually, this means transforming and translating. */
/* */
static FT_Error
TT_Process_Composite_Component( TT_Loader loader,
FT_SubGlyph subglyph,
FT_UInt start_point,
FT_UInt num_base_points )
{
FT_GlyphLoader gloader = loader->gloader;
FT_Vector* base_vec = gloader->base.outline.points;
FT_UInt num_points = gloader->base.outline.n_points;
FT_Bool have_scale;
FT_Pos x, y;
have_scale = FT_BOOL( subglyph->flags & ( WE_HAVE_A_SCALE |
WE_HAVE_AN_XY_SCALE |
WE_HAVE_A_2X2 ) );
/* perform the transform required for this subglyph */
if ( have_scale )
{
FT_UInt i;
for ( i = num_base_points; i < num_points; i++ )
FT_Vector_Transform( base_vec + i, &subglyph->transform );
}
/* get offset */
if ( !( subglyph->flags & ARGS_ARE_XY_VALUES ) )
{
FT_UInt k = subglyph->arg1;
FT_UInt l = subglyph->arg2;
FT_Vector* p1;
FT_Vector* p2;
/* match l-th point of the newly loaded component to the k-th point */
/* of the previously loaded components. */
/* change to the point numbers used by our outline */
k += start_point;
l += num_base_points;
if ( k >= num_base_points ||
l >= num_points )
return TT_Err_Invalid_Composite;
p1 = gloader->base.outline.points + k;
p2 = gloader->base.outline.points + l;
x = p1->x - p2->x;
y = p1->y - p2->y;
}
else
{
x = subglyph->arg1;
y = subglyph->arg2;
if ( !x && !y )
return TT_Err_Ok;
/* Use a default value dependent on */
/* TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED. This is useful for old TT */
/* fonts which don't set the xxx_COMPONENT_OFFSET bit. */
if ( have_scale &&
#ifdef TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED
!( subglyph->flags & UNSCALED_COMPONENT_OFFSET ) )
#else
( subglyph->flags & SCALED_COMPONENT_OFFSET ) )
#endif
{
#if 0
/*************************************************************************/
/* */
/* This algorithm is what Apple documents. But it doesn't work. */
/* */
int a = subglyph->transform.xx > 0 ? subglyph->transform.xx
: -subglyph->transform.xx;
int b = subglyph->transform.yx > 0 ? subglyph->transform.yx
: -subglyph->transform.yx;
int c = subglyph->transform.xy > 0 ? subglyph->transform.xy
: -subglyph->transform.xy;
int d = subglyph->transform.yy > 0 ? subglyph->transform.yy
: -subglyph->transform.yy;
int m = a > b ? a : b;
int n = c > d ? c : d;
if ( a - b <= 33 && a - b >= -33 )
m *= 2;
if ( c - d <= 33 && c - d >= -33 )
n *= 2;
x = FT_MulFix( x, m );
y = FT_MulFix( y, n );
#else /* 0 */
/*************************************************************************/
/* */
/* This algorithm is a guess and works much better than the above. */
/* */
FT_Fixed mac_xscale = FT_SqrtFixed(
FT_MulFix( subglyph->transform.xx,
subglyph->transform.xx ) +
FT_MulFix( subglyph->transform.xy,
subglyph->transform.xy ) );
FT_Fixed mac_yscale = FT_SqrtFixed(
FT_MulFix( subglyph->transform.yy,
subglyph->transform.yy ) +
FT_MulFix( subglyph->transform.yx,
subglyph->transform.yx ) );
x = FT_MulFix( x, mac_xscale );
y = FT_MulFix( y, mac_yscale );
#endif /* 0 */
}
if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) )
{
FT_Fixed x_scale = ((TT_Size)loader->size)->metrics.x_scale;
FT_Fixed y_scale = ((TT_Size)loader->size)->metrics.y_scale;
x = FT_MulFix( x, x_scale );
y = FT_MulFix( y, y_scale );
if ( subglyph->flags & ROUND_XY_TO_GRID )
{
x = FT_PIX_ROUND( x );
y = FT_PIX_ROUND( y );
}
}
}
if ( x || y )
translate_array( num_points - num_base_points,
base_vec + num_base_points,
x, y );
return TT_Err_Ok;
}
/*************************************************************************/
/* */
/* <Function> */
/* TT_Process_Composite_Glyph */
/* */
/* <Description> */
/* This is slightly different from TT_Process_Simple_Glyph, in that */
/* its sole purpose is to hint the glyph. Thus this function is */
/* only available when bytecode interpreter is enabled. */
/* */
static FT_Error
TT_Process_Composite_Glyph( TT_Loader loader,
FT_UInt start_point,
FT_UInt start_contour )
{
FT_Error error;
FT_Outline* outline;
FT_UInt i;
outline = &loader->gloader->base.outline;
/* make room for phantom points */
error = FT_GLYPHLOADER_CHECK_POINTS( loader->gloader,
outline->n_points + 4,
0 );
if ( error )
return error;
outline->points[outline->n_points ] = loader->pp1;
outline->points[outline->n_points + 1] = loader->pp2;
outline->points[outline->n_points + 2] = loader->pp3;
outline->points[outline->n_points + 3] = loader->pp4;
outline->tags[outline->n_points ] = 0;
outline->tags[outline->n_points + 1] = 0;
outline->tags[outline->n_points + 2] = 0;
outline->tags[outline->n_points + 3] = 0;
#ifdef TT_USE_BYTECODE_INTERPRETER
{
FT_Stream stream = loader->stream;
FT_UShort n_ins;
/* TT_Load_Composite_Glyph only gives us the offset of instructions */
/* so we read them here */
if ( FT_STREAM_SEEK( loader->ins_pos ) ||
FT_READ_USHORT( n_ins ) )
return error;
FT_TRACE5(( " Instructions size = %d\n", n_ins ));
/* check it */
if ( n_ins > ((TT_Face)loader->face)->max_profile.maxSizeOfInstructions )
{
FT_TRACE0(( "Too many instructions (%d)\n", n_ins ));
return TT_Err_Too_Many_Hints;
}
else if ( n_ins == 0 )
return TT_Err_Ok;
if ( FT_STREAM_READ( loader->exec->glyphIns, n_ins ) )
return error;
loader->glyph->control_data = loader->exec->glyphIns;
loader->glyph->control_len = n_ins;
}
#endif
tt_prepare_zone( &loader->zone, &loader->gloader->base,
start_point, start_contour );
/* Some points are likely touched during execution of */
/* instructions on components. So let's untouch them. */
for ( i = start_point; i < loader->zone.n_points; i++ )
loader->zone.tags[i] &= ~( FT_CURVE_TAG_TOUCH_X |
FT_CURVE_TAG_TOUCH_Y );
loader->zone.n_points += 4;
return TT_Hint_Glyph( loader, 1 );
}
/* Calculate the four phantom points. */
/* The first two stand for horizontal origin and advance. */
/* The last two stand for vertical origin and advance. */
#define TT_LOADER_SET_PP( loader ) \
do { \
(loader)->pp1.x = (loader)->bbox.xMin - (loader)->left_bearing; \
(loader)->pp1.y = 0; \
(loader)->pp2.x = (loader)->pp1.x + (loader)->advance; \
(loader)->pp2.y = 0; \
(loader)->pp3.x = 0; \
(loader)->pp3.y = (loader)->top_bearing + (loader)->bbox.yMax; \
(loader)->pp4.x = 0; \
(loader)->pp4.y = (loader)->pp3.y - (loader)->vadvance; \
} while ( 0 )
/*************************************************************************/
/* */
/* <Function> */
/* load_truetype_glyph */
/* */
/* <Description> */
/* Loads a given truetype glyph. Handles composites and uses a */
/* TT_Loader object. */
/* */
static FT_Error
load_truetype_glyph( TT_Loader loader,
FT_UInt glyph_index,
FT_UInt recurse_count )
{
FT_Error error;
FT_Fixed x_scale, y_scale;
FT_ULong offset;
TT_Face face = (TT_Face)loader->face;
FT_GlyphLoader gloader = loader->gloader;
FT_Bool opened_frame = 0;
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
FT_Vector* deltas = NULL;
#endif
#ifdef FT_CONFIG_OPTION_INCREMENTAL
FT_StreamRec inc_stream;
FT_Data glyph_data;
FT_Bool glyph_data_loaded = 0;
#endif
if ( recurse_count > face->max_profile.maxComponentDepth )
{
error = TT_Err_Invalid_Composite;
goto Exit;
}
/* check glyph index */
if ( glyph_index >= (FT_UInt)face->root.num_glyphs )
{
error = TT_Err_Invalid_Glyph_Index;
goto Exit;
}
loader->glyph_index = glyph_index;
if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
{
x_scale = ((TT_Size)loader->size)->metrics.x_scale;
y_scale = ((TT_Size)loader->size)->metrics.y_scale;
}
else
{
x_scale = 0x10000L;
y_scale = 0x10000L;
}
/* get metrics, horizontal and vertical */
{
FT_Short left_bearing = 0, top_bearing = 0;
FT_UShort advance_width = 0, advance_height = 0;
Get_HMetrics( face, glyph_index,
(FT_Bool)!( loader->load_flags &
FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ),
&left_bearing,
&advance_width );
Get_VMetrics( face, glyph_index,
(FT_Bool)!( loader->load_flags &
FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ),
&top_bearing,
&advance_height );
#ifdef FT_CONFIG_OPTION_INCREMENTAL
/* If this is an incrementally loaded font see if there are */
/* overriding metrics for this glyph. */
if ( face->root.internal->incremental_interface &&
face->root.internal->incremental_interface->funcs->get_glyph_metrics )
{
FT_Incremental_MetricsRec metrics;
metrics.bearing_x = left_bearing;
metrics.bearing_y = 0;
metrics.advance = advance_width;
error = face->root.internal->incremental_interface->funcs->get_glyph_metrics(
face->root.internal->incremental_interface->object,
glyph_index, FALSE, &metrics );
if ( error )
goto Exit;
left_bearing = (FT_Short)metrics.bearing_x;
advance_width = (FT_UShort)metrics.advance;
#if 0
/* GWW: Do I do the same for vertical metrics? */
metrics.bearing_x = 0;
metrics.bearing_y = top_bearing;
metrics.advance = advance_height;
error = face->root.internal->incremental_interface->funcs->get_glyph_metrics(
face->root.internal->incremental_interface->object,
glyph_index, TRUE, &metrics );
if ( error )
goto Exit;
top_bearing = (FT_Short)metrics.bearing_y;
advance_height = (FT_UShort)metrics.advance;
#endif /* 0 */
}
#endif /* FT_CONFIG_OPTION_INCREMENTAL */
loader->left_bearing = left_bearing;
loader->advance = advance_width;
loader->top_bearing = top_bearing;
loader->vadvance = advance_height;
if ( !loader->linear_def )
{
loader->linear_def = 1;
loader->linear = advance_width;
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -