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[truetype] Do linear scaling for FT_LOAD_NO_HINTING (#50470). 

* src/truetype/ttobs.h (TT_SizeRec): Add field `hinted_metrics' to
hold hinted metrics.
Make `metrics' a pointer so that `tt_glyph_load' can easily switch
between metrics.

* src/truetype/ttdriver.c (tt_size_request): Updated.
(tt_glyph_load): Use top-level metrics if FT_LOAD_NO_HINTING is
used.

* src/truetype/ttgload.c (TT_Hint_Glyph, TT_Process_Simple_Glyph,
TT_Process_Composite_Component, load_truetype_glyph,
compute_glyph_metrics, TT_Load_Glyph): Updated.

* src/truetype/ttinterp.c (TT_Load_Context): Updated.

* src/truetype/ttobjs.c (tt_size_reset): Updated.

* src/truetype/ttsubpix.c (sph_set_tweaks): Updated.
This commit is contained in:
Werner Lemberg 2017-04-22 23:02:21 +02:00
parent 5aa6716a5e
commit 5f18d867c0
7 changed files with 55 additions and 23 deletions
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23
ChangeLog
View File

@ -1,3 +1,26 @@
2017-04-22 Werner Lemberg <wl@gnu.org>
[truetype] Do linear scaling for FT_LOAD_NO_HINTING (#50470).
* src/truetype/ttobs.h (TT_SizeRec): Add field `hinted_metrics' to
hold hinted metrics.
Make `metrics' a pointer so that `tt_glyph_load' can easily switch
between metrics.
* src/truetype/ttdriver.c (tt_size_request): Updated.
(tt_glyph_load): Use top-level metrics if FT_LOAD_NO_HINTING is
used.
* src/truetype/ttgload.c (TT_Hint_Glyph, TT_Process_Simple_Glyph,
TT_Process_Composite_Component, load_truetype_glyph,
compute_glyph_metrics, TT_Load_Glyph): Updated.
* src/truetype/ttinterp.c (TT_Load_Context): Updated.
* src/truetype/ttobjs.c (tt_size_reset): Updated.
* src/truetype/ttsubpix.c (sph_set_tweaks): Updated.
2017-04-22 Werner Lemberg <wl@gnu.org>
Add new `slight' auto-hinting mode.

12
src/truetype/ttdriver.c
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@ -361,9 +361,10 @@
#ifdef TT_USE_BYTECODE_INTERPRETER
/* for the `MPS' bytecode instruction we need the point size */
{
FT_UInt resolution = ttsize->metrics.x_ppem > ttsize->metrics.y_ppem
? req->horiResolution
: req->vertResolution;
FT_UInt resolution =
ttsize->metrics->x_ppem > ttsize->metrics->y_ppem
? req->horiResolution
: req->vertResolution;
/* if we don't have a resolution value, assume 72dpi */
@ -457,6 +458,11 @@
load_flags |= FT_LOAD_NO_HINTING;
}
/* use hinted metrics only if we load a glyph with hinting */
size->metrics = ( load_flags & FT_LOAD_NO_HINTING )
? &ttsize->metrics
: &size->hinted_metrics;
/* now load the glyph outline if necessary */
error = TT_Load_Glyph( size, slot, glyph_index, load_flags );

32
src/truetype/ttgload.c
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@ -778,8 +778,8 @@
}
else
{
loader->exec->metrics.x_scale = loader->size->metrics.x_scale;
loader->exec->metrics.y_scale = loader->size->metrics.y_scale;
loader->exec->metrics.x_scale = loader->size->metrics->x_scale;
loader->exec->metrics.y_scale = loader->size->metrics->y_scale;
}
#endif
@ -926,7 +926,7 @@
TT_Driver driver = (TT_Driver)FT_FACE_DRIVER( face );
FT_String* family = face->root.family_name;
FT_UInt ppem = loader->size->metrics.x_ppem;
FT_UInt ppem = loader->size->metrics->x_ppem;
FT_String* style = face->root.style_name;
FT_UInt x_scale_factor = 1000;
#endif
@ -955,9 +955,9 @@
if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ||
x_scale_factor != 1000 )
{
x_scale = FT_MulDiv( loader->size->metrics.x_scale,
x_scale = FT_MulDiv( loader->size->metrics->x_scale,
(FT_Long)x_scale_factor, 1000 );
y_scale = loader->size->metrics.y_scale;
y_scale = loader->size->metrics->y_scale;
/* compensate for any scaling by de/emboldening; */
/* the amount was determined via experimentation */
@ -977,8 +977,8 @@
/* scale the glyph */
if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
{
x_scale = loader->size->metrics.x_scale;
y_scale = loader->size->metrics.y_scale;
x_scale = loader->size->metrics->x_scale;
y_scale = loader->size->metrics->y_scale;
do_scale = TRUE;
}
@ -1136,8 +1136,8 @@
if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) )
{
FT_Fixed x_scale = loader->size->metrics.x_scale;
FT_Fixed y_scale = loader->size->metrics.y_scale;
FT_Fixed x_scale = loader->size->metrics->x_scale;
FT_Fixed y_scale = loader->size->metrics->y_scale;
x = FT_MulFix( x, x_scale );
@ -1470,8 +1470,8 @@
if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
{
x_scale = loader->size->metrics.x_scale;
y_scale = loader->size->metrics.y_scale;
x_scale = loader->size->metrics->x_scale;
y_scale = loader->size->metrics->y_scale;
}
else
{
@ -2038,7 +2038,7 @@
y_scale = 0x10000L;
if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
y_scale = size->metrics.y_scale;
y_scale = size->metrics->y_scale;
if ( glyph->format != FT_GLYPH_FORMAT_COMPOSITE )
FT_Outline_Get_CBox( &glyph->outline, &bbox );
@ -2070,7 +2070,7 @@
widthp = tt_face_get_device_metrics( face,
size->metrics.x_ppem,
size->metrics->x_ppem,
glyph_index );
#ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY
@ -2637,11 +2637,11 @@
if ( !glyph->metrics.horiAdvance && glyph->linearHoriAdvance )
glyph->metrics.horiAdvance =
FT_MulFix( glyph->linearHoriAdvance,
size->metrics.x_scale );
size->metrics->x_scale );
if ( !glyph->metrics.vertAdvance && glyph->linearVertAdvance )
glyph->metrics.vertAdvance =
FT_MulFix( glyph->linearVertAdvance,
size->metrics.y_scale );
size->metrics->y_scale );
}
return FT_Err_Ok;
@ -2737,7 +2737,7 @@
/* TrueType glyphs at all sizes using the bytecode interpreter. */
/* */
if ( !( load_flags & FT_LOAD_NO_SCALE ) &&
size->metrics.y_ppem < 24 )
size->metrics->y_ppem < 24 )
glyph->outline.flags |= FT_OUTLINE_HIGH_PRECISION;
Exit:

2
src/truetype/ttinterp.c
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@ -402,7 +402,7 @@
exec->IDefs = size->instruction_defs;
exec->pointSize = size->point_size;
exec->tt_metrics = size->ttmetrics;
exec->metrics = size->metrics;
exec->metrics = *size->metrics;
exec->maxFunc = size->max_func;
exec->maxIns = size->max_ins;

4
src/truetype/ttobjs.c
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@ -1220,7 +1220,7 @@
size->ttmetrics.valid = FALSE;
size_metrics = &size->metrics;
size_metrics = &size->hinted_metrics;
/* copy the result from base layer */
*size_metrics = size->root.metrics;
@ -1280,6 +1280,8 @@
size->ttmetrics.y_ratio = 0x10000L;
}
size->metrics = size_metrics;
#ifdef TT_USE_BYTECODE_INTERPRETER
size->cvt_ready = -1;
#endif /* TT_USE_BYTECODE_INTERPRETER */

3
src/truetype/ttobjs.h
View File

@ -278,7 +278,8 @@ FT_BEGIN_HEADER
/* we have our own copy of metrics so that we can modify */
/* it without affecting auto-hinting (when used) */
FT_Size_Metrics metrics;
FT_Size_Metrics* metrics; /* for the current rendering mode */
FT_Size_Metrics hinted_metrics; /* for the hinted rendering mode */
TT_Size_Metrics ttmetrics;

2
src/truetype/ttsubpix.c
View File

@ -906,7 +906,7 @@
{
TT_Face face = loader->face;
FT_String* family = face->root.family_name;
FT_UInt ppem = loader->size->metrics.x_ppem;
FT_UInt ppem = loader->size->metrics->x_ppem;
FT_String* style = face->root.style_name;