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フォントラベルのHighDPI対応 #645
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berryzplus
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sakura-editor:master
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berryzplus:feature/dpi_font_label
Nov 25, 2018
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フォントラベルのHighDPI対応 #645
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DpiScaleY
の実装はこうなっていて、CDPI::ScaleY
の実装はこうなっていますが、LOGFONT::lfHeight
の値って、lfHeight = -MulDiv(PointSize, GetDeviceCaps(hDC, LOGPIXELSY), 72);
こういうように設定するようにドキュメントに書かれているので画面座標のDPI対応で使う
96
という数値がフォントの場合にも適用できるか心配です。しかし 96 とか 72 とか経緯が不明です…。
https://en.wikipedia.org/wiki/Dots_per_inch#Computer_monitor_DPI_standards
に書かれてそうなのですが tl;dr: です…。
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その辺こだわりなかったので純粋に比率で拡大するようにしました。
72とか96とかについては、前にここで書いてます。
#471 (comment)
この数式を使う場合は、引数のnpsを渡して算出してやる形になるのかな、と思います。
lfHeight = -MulDiv(PointSize, GetDeviceCaps(hDC, LOGPIXELSY), 72);
・・・この数式ってポイントサイズ⇒ピクセルサイズの変換式じゃないですかね?
ポイントという単位は 72 が関係する単位だったと思います。
ちょっと調べてみます。
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https://ja.wikipedia.org/wiki/ポイント
1 pt = 1/72 in. (= 25.4/72 mm = 0.352 777 7... mm)
とありました。
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https://opentype.jp/pointdot.htm
という事なのでフォントの場合は 96 より 72 を使ってあげた方が良いと思います。