diff options
Diffstat (limited to 'src/truetype/ttgload.c')
| -rw-r--r-- | src/truetype/ttgload.c | 55 |
1 files changed, 53 insertions, 2 deletions
diff --git a/src/truetype/ttgload.c b/src/truetype/ttgload.c index bfda76175..5e102c615 100644 --- a/src/truetype/ttgload.c +++ b/src/truetype/ttgload.c @@ -87,7 +87,7 @@ /*************************************************************************/ /* */ /* Return the vertical metrics in font units for a given glyph. */ - /* See macro `TT_LOADER_SET_PP' below for explanations. */ + /* See function `tt_loader_set_pp' below for explanations. */ /* */ FT_LOCAL_DEF( void ) TT_Get_VMetrics( TT_Face face, @@ -2625,7 +2625,58 @@ IS_DEFAULT_INSTANCE ) { error = load_sbit_image( size, glyph, glyph_index, load_flags ); - if ( error ) + if ( FT_ERR_EQ( error, Missing_Bitmap ) ) + { + /* the bitmap strike is incomplete and misses the requested glyph; */ + /* if we have a bitmap-only font, return an empty glyph */ + if ( !FT_IS_SCALABLE( glyph->face ) ) + { + TT_Face face = (TT_Face)glyph->face; + FT_Short left_bearing = 0, top_bearing = 0; + FT_UShort advance_width = 0, advance_height = 0; + + + /* to return an empty glyph, however, we need metrics data */ + /* from the `hmtx' (or `vmtx') table; the assumption is that */ + /* empty glyphs are missing intentionally, representing */ + /* whitespace - not having at least horizontal metrics is */ + /* thus considered an error */ + if ( !face->horz_metrics_size ) + return error; + + /* we now construct an empty bitmap glyph */ + TT_Get_HMetrics( face, glyph_index, + &left_bearing, + &advance_width ); + TT_Get_VMetrics( face, glyph_index, + 0, + &top_bearing, + &advance_height ); + + glyph->outline.n_points = 0; + glyph->outline.n_contours = 0; + + glyph->metrics.width = 0; + glyph->metrics.height = 0; + + glyph->metrics.horiBearingX = left_bearing; + glyph->metrics.horiBearingY = 0; + glyph->metrics.horiAdvance = advance_width; + + glyph->metrics.vertBearingX = 0; + glyph->metrics.vertBearingY = top_bearing; + glyph->metrics.vertAdvance = advance_height; + + glyph->format = FT_GLYPH_FORMAT_BITMAP; + glyph->bitmap.pixel_mode = FT_PIXEL_MODE_MONO; + + glyph->bitmap_left = 0; + glyph->bitmap_top = 0; + + return FT_Err_Ok; + } + } + else if ( error ) { /* return error if font is not scalable */ if ( !FT_IS_SCALABLE( glyph->face ) ) |