[英]DirectWrite ligature substitution feature
我正在嘗試使用 DirectWrite 獲取給定字符串的正確字形。 我正在嘗試啟用 OpenType 功能進行測試,在這種情況下是字體連字替換。 我正在使用一種包含 OpenType 'liga' 標簽的字體,它有一個單獨的 ll 字形。
這是我的代碼:
text = 'Hello'
analyze = IDWriteTextAnalyzer()
self.font.write_factory.CreateTextAnalyzer(byref(analyze))
tags = [DWRITE_FONT_FEATURE_TAG_STANDARD_LIGATURES]
num_feature = len(tags)
if num_feature:
typo_features = DWRITE_TYPOGRAPHIC_FEATURES()
typo_features.featureCount = num_feature
typo_features.features = (DWRITE_FONT_FEATURE * num_feature)()
for i in range(num_feature):
typo_features.features[i] = DWRITE_FONT_FEATURE(tags[i], 1)
feature_range = (UINT32 * num_feature)(len(text))
else:
typo_features = None
feature_range = None
max_count = int(3 * len(text) / 2 + 16)
length = len(text)
clusters = (UINT16 * length)()
text_props = (DWRITE_SHAPING_TEXT_PROPERTIES * length)()
indices = (UINT16 * max_count)()
glyph_props = (DWRITE_SHAPING_GLYPH_PROPERTIES * max_count)()
actual_count = UINT32()
analyze.GetGlyphs(text,
len(text),
self.font.font_face,
False, # sideways
False, # righttoleft
script, # scriptAnalysis
None, # localName
None, # numberSub
typo_features, # typo features
feature_range, # feature range
1, # count
max_count,
clusters, # cluster map
text_props, # text props
indices, # glyph indices
glyph_props, #glyph pops
byref(actual_count)#glyph count
)
但是,在檢查返回值時,它總共有 5 個字形,並且在字形索引中沒有顯示連字索引,只有原始的兩個 l: [43, 72, 79, 79, 82, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
我不確定我是否理解正確。 我認為它將用字符串中的兩個 l 代替 ll 字形是不正確的嗎? 或者是否有另一個過程使這個索引成為真正的連字? 任何輸入都是有幫助的,因為我是新手。 謝謝
有很多事情需要檢查:
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