当渲染元文件时，文本太大 [英] when rendering metafile, the texts are too large

问题描述

问题是当我在渲染图元文件时，文本太大了。 Irfanview和FastReports渲染如下：

windows 7绘画渲染正常：（这是文本应该是什么样子）

任何想法是什么导致的？

谢谢！

解决方案

p> emf 文件只是一个GDI命令列表。实际上，使用标准的Windows GDI命令（在Delphi中，一个 TMetaFile 只是围绕这些API的一个包装），可以很容易地播放系统。 / p>

当IrfanView 或 FastReport 呈现图元文件内容时，他们只是使用Windows GDI相应的命令。当Windows 7 Paint 显示元文件内容时，它将使用GDI +渲染器。我甚至认为它会将 emf 文件内部转换为 emf + 格式，然后使用GDI +进行反加工。 / p>

所以如果 emf 文件在IrfanView 或 FastReport em>，我怀疑这是因为你的图元文件形式不完整：你使用的第三方图形引擎是生产非标准的emf。一个可能的问题是目标系统中使用的字体缺失，而GDI不会替换与GDI +相同的字体。

另一个可能的是， code> emf 文件可能是一种双重格式：它包含 emf 格式（这不正确使用GDI）和 emf + 格式（按照预期使用GDI +呈现）创建的结果不正确。通常这个双重 emf / emf + 格式不应该存在：即使是官方的GDI +库也不允许将其元文件内容保存在emf + / em>。这是由您的第三方图书馆创建的某种怪物格式。

我建议如下：

• 下载并检查您的 emf 文件与 EmfExplorer ;


• 尝试使用GDI +来呈现图元文件;


• 尝试使用 emf 到 emf + 转换器API。

要使用GDI +，请查看开源 SynGdiPlus单位：它将添加GDI +反加工到您生成的位图。它可以将 emf 转换为 emf + 。它将使用原生Vista / Seven API（就像Windows 7绘图），或Windows XP下的普通Delphi代码。

I'm having a problem with metafile rendering in my Delphi XE application.

the problem is that when I'm rendering the metafile, the texts are too large. Irfanview and FastReports render it like this:

windows 7 Paint renders it fine: (here's what the text should look like)

Any ideas what is causing this?

Thank you!

解决方案

emf files are just a list of GDI commands. In fact, they can be "played back" very easily by the system, using standard Windows GDI command (in Delphi, a TMetaFile is just a wrapper around those APIs).

When IrfanView or FastReport renders the metafile content, they just use Windows GDI corresponding commands. When Windows 7 Paint renders the metafile content, it uses the GDI+ renderer. I even think it internally convert the emf file into emf+ format, then renders it with anti-aliaising using GDI+.

So if the emf file renders incorrectly in IrfanView or FastReport, I suspect this is because your metafile is not well formed: the third party graphic engine you are using is producing non standard emf. A possible issue is that the font used is missing in the target system, and GDI does not substitute the font with the same as GDI+ does.

Another possibility is that the emf file is maybe a dual format: it contains both emf format (which was not properly created so is not rendered correctly using GDI) and emf+ format (which is rendered as expected using GDI+). Normally this dual emf/emf+format should not exist: even the official GDI+ library does not allow to save its metafile content in emf+. This is some kind of "monster" format, created by your third-party library.

I suggest the following:

• Download and check your emf file with EmfExplorer;
• Try to use GDI+ to render the metafile;
• Try to use the emf to emf+ converter API.

For using GDI+, take a look at an Open Source SynGdiPlus unit: it will add GDI+ anti-aliaising to your produced bitmap. It is able to convert emf to emf+. It will use native Vista/Seven API (just like Windows 7 paint), or plain Delphi code under Windows XP.

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