diff options
Diffstat (limited to 'pango')
| -rw-r--r-- | pango/pangowin32-dwrite-fontmap.cpp | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/pango/pangowin32-dwrite-fontmap.cpp b/pango/pangowin32-dwrite-fontmap.cpp index db033d27..d91b236d 100644 --- a/pango/pangowin32-dwrite-fontmap.cpp +++ b/pango/pangowin32-dwrite-fontmap.cpp @@ -379,14 +379,116 @@ util_to_pango_weight (DWRITE_FONT_WEIGHT weight) return (PangoWeight) util_map_weight (weight); } +/* macros to help parse the font feature tables, referring to FreeType2 */ +#define DWRITE_UCHAR_ULONG( p, i, s ) ((UINT32)( ((const unsigned char *)(p))[(i)] ) << (s) ) + +#define DWRITE_PEEK_ULONG( p ) (UINT32)( DWRITE_UCHAR_ULONG( p, 0, 24 ) | \ + DWRITE_UCHAR_ULONG( p, 1, 16 ) | \ + DWRITE_UCHAR_ULONG( p, 2, 8 ) | \ + DWRITE_UCHAR_ULONG( p, 3, 0 ) ) + +#define DWRITE_NEXT_ULONG( buffer ) ( (unsigned long)( buffer += 4, DWRITE_PEEK_ULONG( buffer - 4 ) ) ) + +gboolean +pango_win32_dwrite_font_face_check_feature_enabled (IDWriteFontFace *face, + UINT32 dwrite_feature_tag) +{ + UINT32 table_size; + const unsigned int *table_data; + void *table_ctx; + gboolean exists; + gboolean result; + + if (SUCCEEDED (face->TryGetFontTable (dwrite_feature_tag, + (const void **)(&table_data), + &table_size, + &table_ctx, + &exists)) && exists) + { + result = (DWRITE_NEXT_ULONG (table_data) != 0); + face->ReleaseFontTable (table_ctx); + } + + return result; +} + +#define MAX_NUM_FEATURES 255 + static PangoVariant util_to_pango_variant (IDWriteFont *font) { PangoVariant variant = PANGO_VARIANT_NORMAL; + PangoWin32DWriteItems *items = pango_win32_get_direct_write_items (); + + if (items->text_analyzer2 != NULL) + { + const DWRITE_SCRIPT_SHAPES default_script_shapes = DWRITE_SCRIPT_SHAPES_DEFAULT; + const DWRITE_SCRIPT_ANALYSIS analysis = {0, default_script_shapes}; + IDWriteFontFace *face = _pango_win32_get_dwrite_font_face_from_dwrite_font (font); + unsigned int num_features, i; + DWRITE_FONT_FEATURE_TAG tags[MAX_NUM_FEATURES]; + gboolean all_caps = FALSE; + HRESULT hr; + + hr = items->text_analyzer2->GetTypographicFeatures (face, + analysis, + NULL, + MAX_NUM_FEATURES, + &num_features, + tags); + if (SUCCEEDED (hr)) + { + for (i = 0; i < num_features; i ++) + { + if (tags[i] == DWRITE_FONT_FEATURE_TAG_SMALL_CAPITALS || + tags[i] == DWRITE_FONT_FEATURE_TAG_SMALL_CAPITALS_FROM_CAPITALS || + tags[i] == DWRITE_FONT_FEATURE_TAG_PETITE_CAPITALS || + tags[i] == DWRITE_FONT_FEATURE_TAG_PETITE_CAPITALS_FROM_CAPITALS || + tags[i] == DWRITE_FONT_FEATURE_TAG_UNICASE || + tags[i] == DWRITE_FONT_FEATURE_TAG_TITLING) + { + gboolean enabled = pango_win32_dwrite_font_face_check_feature_enabled (face, tags[i]); + + if (enabled) + { + switch (tags[i]) + { + case DWRITE_FONT_FEATURE_TAG_SMALL_CAPITALS: + variant = all_caps ? PANGO_VARIANT_ALL_SMALL_CAPS : PANGO_VARIANT_SMALL_CAPS; + break; + case DWRITE_FONT_FEATURE_TAG_SMALL_CAPITALS_FROM_CAPITALS: + if (variant == PANGO_VARIANT_SMALL_CAPS) + variant = PANGO_VARIANT_ALL_SMALL_CAPS; + else + all_caps = TRUE; + break; + case DWRITE_FONT_FEATURE_TAG_PETITE_CAPITALS: + variant = all_caps ? PANGO_VARIANT_ALL_PETITE_CAPS : PANGO_VARIANT_PETITE_CAPS; + break; + case DWRITE_FONT_FEATURE_TAG_PETITE_CAPITALS_FROM_CAPITALS: + if (variant == PANGO_VARIANT_PETITE_CAPS) + variant = PANGO_VARIANT_ALL_PETITE_CAPS; + else + all_caps = TRUE; + break; + case DWRITE_FONT_FEATURE_TAG_UNICASE: + variant = PANGO_VARIANT_UNICASE; + break; + case DWRITE_FONT_FEATURE_TAG_TITLING: + variant = PANGO_VARIANT_TITLE_CAPS; + break; + } + } + } + } + } + } return variant; } +#undef MAX_NUM_FEATURES + static PangoFontDescription* util_get_pango_font_description (IDWriteFont *font, const char *family_name) |