为什么DirectX/DirectWrite/Direct2D文本渲染不能像GDI一样清晰? [英] Why can't DirectX/DirectWrite/Direct2D text rendering be as sharp as GDI?

问题描述

我已经知道亚像素定位会导致与GDI相比，DirectWrite文本呈现较模糊.

I already know that sub-pixel positioning causes DirectWrite text rendering to be blurry compared to GDI.

但是，我的问题稍微更基本了: 为什么不能使用DirectWrite(及相关方法)来像GDI一样清晰地呈现文本?

However, my question is a bit more fundamental: Why can't DirectWrite (and related methods) be made to render text as sharply as GDI?

换句话说:
是什么阻止 DirectWrite能够像GDI一样将文本捕捉到最近的像素?

In other words:
What prevents DirectWrite from being able to snap text to the nearest pixel, the way GDI can?

例如，这是硬件问题吗?驱动程序体系结构问题?难道它根本没有实现?还是其他?

Is it, for example, a hardware issue? A driver architecture issue? Is it simply not implemented? Or something else?

Direct2D，别名:

Direct2D, aliased:

Direct2D，默认设置:

Direct2D, default:

Direct2D(经典GDI"):

Direct2D ("classic GDI"):

Direct2D(自然GDI"):

Direct2D ("natural GDI"):

实际经典GDI:

实际 ClearType GDI:

Actual ClearType GDI:

推荐答案

您没有将like与like进行比较.您的Direct2D样本全部以灰度显示，而GDI和Linux样本正在使用亚像素抗锯齿(在Windows上也称为ClearType).

You aren't comparing like with like. Your Direct2D samples are all rendered in grayscale, whereas the GDI and Linux samples are using sub-pixel anti-aliasing (aka ClearType on Windows).

此页面描述了启用清除类型所需的操作:

This page describes what you need to do to enable cleartype: http://msdn.microsoft.com/en-us/library/windows/desktop/dd368170%28v=vs.85%29.aspx

当测试这样的渲染时，总是值得使用Windows Magnifier或类似工具来检查您是否确实得到了自己认为得到的东西.

N.B. When testing rendering like this, it's always worth using Windows Magnifier or similar to check that you are actually getting what you think you are getting.

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