https://github.com/yu2924/testd2dtextrender

D2D/DirectWrite experiment
https://github.com/yu2924/testd2dtextrender

direct2d directwrite experiment wtl

Last synced: about 1 month ago
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D2D/DirectWrite experiment

• Host: GitHub
• URL: https://github.com/yu2924/testd2dtextrender
• Owner: yu2924
• License: cc0-1.0
• Created: 2023-05-06T09:51:04.000Z (about 2 years ago)
• Default Branch: main
• Last Pushed: 2024-12-04T05:23:39.000Z (6 months ago)
• Last Synced: 2025-03-27T20:39:16.525Z (about 2 months ago)
• Topics: direct2d, directwrite, experiment, wtl
• Language: C++
• Homepage:
• Size: 290 KB
• Stars: 2
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# TestD2DTextRender



Windows 11において、Notepad.exeのテキストレンダリング品質に疑問を覚えた。特に日本語の漢字かな文字で顕著なジャギーを認めた。そこで、Direct2D/DirectWrite環境におけるテキストレンダリングの方法について調査した。これは実験であり、実用的な実装ではない。  

On Windows 11, the text rendering quality of Notepad.exe was questionable. In particular, I observed significant jaggies in Japanese Kanji/kana characters. Therefore, I investigated the text rendering method in the Direct2D/DirectWrite environment. This is an experiment, not a practical implementation.

## Results and Discussion

2種類のアプリを試作し、テキストレンダリングの状態を観察した。  

I made two prototypes of the application and made comparative observations of the text rendering quality.  

- using Direct2D/DirectWrite API

  - text antialias mode = `D2D1_TEXT_ANTIALIAS_MODE_DEFAULT`

  - text antialias mode = `D2D1_TEXT_ANTIALIAS_MODE_CLEARTYPE`

  - text antialias mode = `D2D1_TEXT_ANTIALIAS_MODE_GRAYSCALE`

  - text antialias mode = `D2D1_TEXT_ANTIALIAS_MODE_ALIASED`

- using RichEditD2D control

  - default GDI

  - switch to `EM_SWITCHTOD2D`

以下にそれぞれのレンダリング結果のキャプチャを示す:  

Here is a capture of each rendering result:  

|Condition|Capture|Quality|

|-|-|-|

|Direct2D/DirectWrite (Default)||😊|

|Direct2D/DirectWrite (ClearType)||😊|

|Direct2D/DirectWrite (GrayScale)||😊|

|Direct2D/DirectWrite (Aliased)||😡|

|RichEditD2D (GDI)||😊|

|RichEditD2D (D2D)||🤔|

- **DirectWrite (Aliased)** では顕著なエイリアスが認められ、予想通りの結果である。

- **RichEditD2D (D2D)** では少々のエイリアスが認められ、RichEditD2Dコントロールの不備であると考える。

- その他のケースではアンチエイリアス処理は良好に見える。

総合して、Direct2D/DirectWrite APIの動作に問題は無く、RichEditD2DコントロールのD2Dモードに問題があるようだ。

- **DirectWrite (Aliased)** shows significant aliasing, which is to be expected.

- **RichEditD2D (D2D)** shows a small amount of aliasing, which I believe is a fault of the RichEditD2D control.

- In other cases, anti-aliasing appears to be good.

Overall, there is no problem with the Direct2D/DirectWrite API behavior, and there seems to be a problem with the D2D mode of the RichEditD2D control.

## Requirement to Build

* Visual Studio 2019

* Windows Template Library (WTL) 10

## References

* [RichEditD2D Window Controls](https://devblogs.microsoft.com/math-in-office/richeditd2d-window-controls/)

## Written by

[yu2924](https://twitter.com/yu2924)

## License

CC0 1.0 Universal