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-rw-r--r--src/truetype/ttgload.c148
1 files changed, 147 insertions, 1 deletions
diff --git a/src/truetype/ttgload.c b/src/truetype/ttgload.c
index 22cbc09..5b7cbe9 100644
--- a/src/truetype/ttgload.c
+++ b/src/truetype/ttgload.c
@@ -32,6 +32,7 @@
#endif
#include "tterrors.h"
+#include "ttsubpix.h"
/*************************************************************************/
@@ -149,6 +150,15 @@
loader->top_bearing = top_bearing;
loader->vadvance = advance_height;
+#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
+ if ( loader->exec )
+ loader->exec->sph_tweak_flags = 0;
+
+ /* this may not be the right place for this, but it works */
+ if ( loader->exec && loader->exec->ignore_x_mode )
+ sph_set_tweaks( loader, glyph_index );
+#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */
+
if ( !loader->linear_def )
{
loader->linear_def = 1;
@@ -813,6 +823,13 @@
loader->pp4 = zone->cur[zone->n_points - 1];
}
+#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
+ if ( loader->exec->sph_tweak_flags & SPH_TWEAK_DEEMBOLDEN )
+ FT_Outline_EmboldenXY( &loader->gloader->current.outline, -24, 0 );
+
+ else if ( loader->exec->sph_tweak_flags & SPH_TWEAK_EMBOLDEN )
+ FT_Outline_EmboldenXY( &loader->gloader->current.outline, 24, 0 );
+#endif
return TT_Err_Ok;
}
@@ -835,6 +852,13 @@
FT_Outline* outline;
FT_Int n_points;
+ TT_Face face = (TT_Face)loader->face;
+#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
+ FT_String* family = face->root.family_name;
+ int ppem = loader->size->metrics.x_ppem;
+ FT_String* style = face->root.style_name;
+ float x_scale_factor = 1.0;
+#endif
outline = &gloader->current.outline;
n_points = outline->n_points;
@@ -889,6 +913,26 @@
loader->zone.n_points + 4 );
}
+#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
+ /* scale, but only if enabled and only if TT hinting is being used */
+ if ( IS_HINTED( loader->load_flags ) )
+ x_scale_factor = scale_test_tweak( face, family, ppem, style,
+ loader->glyph_index, X_SCALING_Rules,
+ X_SCALING_RULES_SIZE );
+ /* scale the glyph */
+ if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ||
+ x_scale_factor != 1.0 )
+ {
+ FT_Vector* vec = outline->points;
+ FT_Vector* limit = outline->points + n_points;
+ FT_Fixed x_scale = ((TT_Size)loader->size)->metrics.x_scale * x_scale_factor;
+ FT_Fixed y_scale = ((TT_Size)loader->size)->metrics.y_scale;
+
+ /* compensate for any scaling by de/emboldening */
+ if ( x_scale_factor != 1.0 && ppem > 11 )
+ FT_Outline_EmboldenXY( outline,
+ (FT_Int) ( 16.0 * (float)ppem * ( 1.0 - x_scale_factor) ), 0 );
+#else
/* scale the glyph */
if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
{
@@ -896,7 +940,7 @@
FT_Vector* limit = outline->points + n_points;
FT_Fixed x_scale = ((TT_Size)loader->size)->metrics.x_scale;
FT_Fixed y_scale = ((TT_Size)loader->size)->metrics.y_scale;
-
+#endif
for ( ; vec < limit; vec++ )
{
@@ -1648,12 +1692,26 @@
{
FT_Byte* widthp;
+#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
+ FT_Bool ignore_x_mode;
+
+
+ ignore_x_mode = FT_BOOL( FT_LOAD_TARGET_MODE( loader->load_flags ) !=
+ FT_RENDER_MODE_MONO );
+#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */
widthp = tt_face_get_device_metrics( face,
size->root.metrics.x_ppem,
glyph_index );
+#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
+ if ( widthp &&
+ ( ( ignore_x_mode && loader->exec->compatible_widths ) ||
+ !ignore_x_mode ||
+ SPH_OPTION_BITMAP_WIDTHS ) )
+#else
if ( widthp )
+#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */
glyph->metrics.horiAdvance = *widthp << 6;
}
@@ -1848,6 +1906,15 @@
{
TT_ExecContext exec;
FT_Bool grayscale;
+#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
+ FT_Bool subpixel_hinting;
+ FT_Bool grayscale_hinting;
+#if 0
+ FT_Bool compatible_widths;
+ FT_Bool symmetrical_smoothing;
+ FT_Bool bgr;
+#endif
+#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */
if ( !size->cvt_ready )
@@ -1865,11 +1932,88 @@
if ( !exec )
return TT_Err_Could_Not_Find_Context;
+#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
+
+ subpixel_hinting = FT_BOOL( ( FT_LOAD_TARGET_MODE( load_flags )
+ != FT_RENDER_MODE_MONO ) &&
+ SPH_OPTION_SET_SUBPIXEL );
+
+ if ( subpixel_hinting )
+ grayscale = grayscale_hinting = FALSE;
+
+ else if ( SPH_OPTION_SET_GRAYSCALE )
+ {
+ grayscale = grayscale_hinting = TRUE;
+ subpixel_hinting = FALSE;
+ }
+
+ if ( FT_IS_TRICKY( glyph->face ) )
+ {
+ subpixel_hinting = grayscale_hinting = FALSE;
+ }
+
+ exec->ignore_x_mode = subpixel_hinting || grayscale_hinting;
+ exec->rasterizer_version = SPH_OPTION_SET_RASTERIZER_VERSION;
+ if ( exec->sph_tweak_flags & SPH_TWEAK_RASTERIZER_35 )
+ exec->rasterizer_version = 35;
+
+#if 1
+ exec->compatible_widths = SPH_OPTION_SET_COMPATIBLE_WIDTHS;
+ exec->symmetrical_smoothing = FALSE;
+ exec->bgr = FALSE;
+#else /* 0 */
+ exec->compatible_widths =
+ FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) !=
+ TT_LOAD_COMPATIBLE_WIDTHS );
+ exec->symmetrical_smoothing =
+ FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) !=
+ TT_LOAD_SYMMETRICAL_SMOOTHING );
+ exec->bgr =
+ FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) !=
+ TT_LOAD_BGR );
+#endif /* 0 */
+
+#else /* !TT_CONFIG_OPTION_SUBPIXEL_HINTING */
+
grayscale =
FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != FT_RENDER_MODE_MONO );
+#endif /* !TT_CONFIG_OPTION_SUBPIXEL_HINTING */
+
TT_Load_Context( exec, face, size );
+#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
+
+ /* a change from mono to subpixel rendering (and vice versa) */
+ /* requires a re-execution of the CVT program */
+ if ( subpixel_hinting != exec->subpixel_hinting )
+ {
+ FT_UInt i;
+
+
+ exec->subpixel_hinting = subpixel_hinting;
+
+ for ( i = 0; i < size->cvt_size; i++ )
+ size->cvt[i] = FT_MulFix( face->cvt[i], size->ttmetrics.scale );
+ tt_size_run_prep( size, pedantic );
+ }
+
+ /* a change from mono to grayscale rendering (and vice versa) */
+ /* requires a re-execution of the CVT program */
+ if ( grayscale != exec->grayscale_hinting )
+ {
+ FT_UInt i;
+
+
+ exec->grayscale_hinting = grayscale_hinting;
+
+ for ( i = 0; i < size->cvt_size; i++ )
+ size->cvt[i] = FT_MulFix( face->cvt[i], size->ttmetrics.scale );
+ tt_size_run_prep( size, pedantic );
+ }
+
+#else /* !TT_CONFIG_OPTION_SUBPIXEL_HINTING */
+
/* a change from mono to grayscale rendering (and vice versa) */
/* requires a re-execution of the CVT program */
if ( grayscale != exec->grayscale )
@@ -1887,6 +2031,8 @@
tt_size_run_prep( size, pedantic );
}
+#endif /* !TT_CONFIG_OPTION_SUBPIXEL_HINTING */
+
/* see whether the cvt program has disabled hinting */
if ( exec->GS.instruct_control & 1 )
load_flags |= FT_LOAD_NO_HINTING;
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-27 19:59:44 +0000