summaryrefslogtreecommitdiffstats
path: root/modules/freetype2/src/autofit/afloader.c
diff options
context:
space:
mode:
Diffstat (limited to 'modules/freetype2/src/autofit/afloader.c')
-rw-r--r--modules/freetype2/src/autofit/afloader.c125
1 files changed, 86 insertions, 39 deletions
diff --git a/modules/freetype2/src/autofit/afloader.c b/modules/freetype2/src/autofit/afloader.c
index 7f75fc349..a55550b33 100644
--- a/modules/freetype2/src/autofit/afloader.c
+++ b/modules/freetype2/src/autofit/afloader.c
@@ -4,7 +4,7 @@
/* */
/* Auto-fitter glyph loading routines (body). */
/* */
-/* Copyright 2003-2016 by */
+/* Copyright 2003-2018 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
@@ -97,11 +97,13 @@
AF_FaceGlobals globals = loader->globals;
AF_WritingSystemClass writing_system_class;
+ FT_Size_Metrics* size_metrics = &face->size->internal->autohint_metrics;
+
FT_Pos stdVW = 0;
FT_Pos stdHW = 0;
- FT_Bool size_changed = face->size->metrics.x_ppem
- != globals->stem_darkening_for_ppem;
+ FT_Bool size_changed = size_metrics->x_ppem !=
+ globals->stem_darkening_for_ppem;
FT_Fixed em_size = af_intToFixed( face->units_per_EM );
FT_Fixed em_ratio = FT_DivFix( af_intToFixed( 1000 ), em_size );
@@ -112,7 +114,7 @@
/* Skip stem darkening for broken fonts. */
if ( !face->units_per_EM )
{
- error = FT_Err_Corrupted_Font_Header;
+ error = FT_ERR( Corrupted_Font_Header );
goto Exit;
}
@@ -130,7 +132,7 @@
&stdVW );
else
{
- error = FT_Err_Unimplemented_Feature;
+ error = FT_ERR( Unimplemented_Feature );
goto Exit;
}
@@ -145,11 +147,11 @@
face,
stdVW ) );
darken_x = FT_DivFix( FT_MulFix( darken_by_font_units_x,
- face->size->metrics.x_scale ),
+ size_metrics->x_scale ),
em_ratio );
globals->standard_vertical_width = stdVW;
- globals->stem_darkening_for_ppem = face->size->metrics.x_ppem;
+ globals->stem_darkening_for_ppem = size_metrics->x_ppem;
globals->darken_x = af_fixedToInt( darken_x );
}
@@ -164,11 +166,11 @@
face,
stdHW ) );
darken_y = FT_DivFix( FT_MulFix( darken_by_font_units_y,
- face->size->metrics.y_scale ),
+ size_metrics->y_scale ),
em_ratio );
globals->standard_horizontal_width = stdHW;
- globals->stem_darkening_for_ppem = face->size->metrics.x_ppem;
+ globals->stem_darkening_for_ppem = size_metrics->x_ppem;
globals->darken_y = af_fixedToInt( darken_y );
/*
@@ -217,15 +219,16 @@
{
FT_Error error;
- FT_Size size = face->size;
- FT_GlyphSlot slot = face->glyph;
- FT_Slot_Internal internal = slot->internal;
- FT_GlyphLoader gloader = internal->loader;
+ FT_Size size = face->size;
+ FT_Size_Internal size_internal = size->internal;
+ FT_GlyphSlot slot = face->glyph;
+ FT_Slot_Internal slot_internal = slot->internal;
+ FT_GlyphLoader gloader = slot_internal->loader;
- AF_GlyphHints hints = loader->hints;
+ AF_GlyphHints hints = loader->hints;
AF_ScalerRec scaler;
AF_StyleMetrics style_metrics;
- FT_UInt style_options = AF_STYLE_NONE_DFLT;
+ FT_UInt style_options = AF_STYLE_NONE_DFLT;
AF_StyleClass style_class;
AF_WritingSystemClass writing_system_class;
@@ -239,24 +242,65 @@
FT_ZERO( &scaler );
+ if ( !size_internal->autohint_metrics.x_scale ||
+ size_internal->autohint_mode != FT_LOAD_TARGET_MODE( load_flags ) )
+ {
+ /* switching between hinting modes usually means different scaling */
+ /* values; this later on enforces recomputation of everything */
+ /* related to the current size */
+
+ size_internal->autohint_mode = FT_LOAD_TARGET_MODE( load_flags );
+ size_internal->autohint_metrics = size->metrics;
+
+#ifdef AF_CONFIG_OPTION_TT_SIZE_METRICS
+ {
+ FT_Size_Metrics* size_metrics = &size_internal->autohint_metrics;
+
+
+ /* set metrics to integer values and adjust scaling accordingly; */
+ /* this is the same setup as with TrueType fonts, cf. function */
+ /* `tt_size_reset' in file `ttobjs.c' */
+ size_metrics->ascender = FT_PIX_ROUND(
+ FT_MulFix( face->ascender,
+ size_metrics->y_scale ) );
+ size_metrics->descender = FT_PIX_ROUND(
+ FT_MulFix( face->descender,
+ size_metrics->y_scale ) );
+ size_metrics->height = FT_PIX_ROUND(
+ FT_MulFix( face->height,
+ size_metrics->y_scale ) );
+
+ size_metrics->x_scale = FT_DivFix( size_metrics->x_ppem << 6,
+ face->units_per_EM );
+ size_metrics->y_scale = FT_DivFix( size_metrics->y_ppem << 6,
+ face->units_per_EM );
+ size_metrics->max_advance = FT_PIX_ROUND(
+ FT_MulFix( face->max_advance_width,
+ size_metrics->x_scale ) );
+ }
+#endif /* AF_CONFIG_OPTION_TT_SIZE_METRICS */
+ }
+
/*
* TODO: This code currently doesn't support fractional advance widths,
- * i.e. placing hinted glyphs at anything other than integer
+ * i.e., placing hinted glyphs at anything other than integer
* x-positions. This is only relevant for the warper code, which
* scales and shifts glyphs to optimize blackness of stems (hinting on
* the x-axis by nature places things on pixel integers, hinting on the
- * y-axis only, i.e. LIGHT mode, doesn't touch the x-axis). The delta
+ * y-axis only, i.e., LIGHT mode, doesn't touch the x-axis). The delta
* values of the scaler would need to be adjusted.
*/
scaler.face = face;
- scaler.x_scale = size->metrics.x_scale;
+ scaler.x_scale = size_internal->autohint_metrics.x_scale;
scaler.x_delta = 0;
- scaler.y_scale = size->metrics.y_scale;
+ scaler.y_scale = size_internal->autohint_metrics.y_scale;
scaler.y_delta = 0;
scaler.render_mode = FT_LOAD_TARGET_MODE( load_flags );
scaler.flags = 0;
+ /* note that the fallback style can't be changed anymore */
+ /* after the first call of `af_loader_load_glyph' */
error = af_loader_reset( loader, module, face );
if ( error )
goto Exit;
@@ -334,18 +378,24 @@
* `standard_{vertical,horizontal}_width' change.
*
* Ignore errors and carry on without emboldening.
+ *
*/
- if ( !module->no_stem_darkening )
+
+ /* stem darkening only works well in `light' mode */
+ if ( scaler.render_mode == FT_RENDER_MODE_LIGHT &&
+ ( !face->internal->no_stem_darkening ||
+ ( face->internal->no_stem_darkening < 0 &&
+ !module->no_stem_darkening ) ) )
af_loader_embolden_glyph_in_slot( loader, face, style_metrics );
- loader->transformed = internal->glyph_transformed;
+ loader->transformed = slot_internal->glyph_transformed;
if ( loader->transformed )
{
FT_Matrix inverse;
- loader->trans_matrix = internal->glyph_matrix;
- loader->trans_delta = internal->glyph_delta;
+ loader->trans_matrix = slot_internal->glyph_matrix;
+ loader->trans_delta = slot_internal->glyph_delta;
inverse = loader->trans_matrix;
if ( !FT_Matrix_Invert( &inverse ) )
@@ -375,18 +425,11 @@
/* 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
-
-
- if ( writing_system_class->style_hints_apply )
- writing_system_class->style_hints_apply( glyph_index,
- hints,
- &gloader->base.outline,
- style_metrics );
- }
+ if ( writing_system_class->style_hints_apply )
+ writing_system_class->style_hints_apply( glyph_index,
+ hints,
+ &gloader->base.outline,
+ style_metrics );
/* we now need to adjust the metrics according to the change in */
/* width/positioning that occurred during the hinting process */
@@ -408,6 +451,8 @@
old_lsb = edge1->opos /* - loader->pp1.x */;
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;
@@ -438,21 +483,23 @@
FT_Pos pp2x = loader->pp2.x;
- loader->pp1.x = FT_PIX_ROUND( pp1x );
- loader->pp2.x = FT_PIX_ROUND( pp2x );
+ 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;
}
}
+ /* `light' mode uses integer advance widths */
+ /* but sets `lsb_delta' and `rsb_delta' */
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 );
+ 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;
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-10 10:53:29 +0000