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Windows和PNG文件下的Emacs

[英]Emacs under Windows and PNG files

原文 2010-04-16 01:30:06 3 4 windows/ emacs

Would anyone have any pointers on getting PNG images to display in Emacs 23 under Win32?.. I have installed the gnuwin32 set of utilities, including libpng and zlib; 任何人都有任何关于获取PNG图像以在Win32下的Emacs 23中显示的指示吗？..我已经安装了gnuwin32实用程序集，包括libpng和zlib; C:\\Program Files\\GnuWin32\\bin is in path. C：\\ Program Files \\ GnuWin32 \\ bin在路径中。 JPG files started working but not PNGs. JPG文件开始工作但不是PNG。 I'd appreciate any hints on getting this to work. 我很欣赏任何关于让它发挥作用的暗示。

EDIT: PNG thumbnails actually display fine (eg in dired via Ct Ct). 编辑：PNG缩略图实际上显示正常（例如通过Ct Ct在dired中）。 However, opening them fails (opens as garbage in fundamental mode, and Mx image-mode says "invalid image specification"). 但是，打开它们会失败（在基本模式下打开为垃圾，而Mx图像模式则表示“无效的图像规范”）。

4 个解决方案

You have to copy one of these dlls "libpng12d.dll" "libpng12.dll" "libpng.dll" "libpng13d.dll" "libpng13.dll" to your emacs-23.1/bin/ directory. 您必须将其中一个“libpng12d.dll”“libpng12.dll”“libpng.dll”“libpng13d.dll”“libpng13.dll”复制到您的emacs-23.1 / bin /目录中。 They require zlib1.dll which you have to copy as well. 他们需要zlib1.dll，你也必须复制。 I did the same thing for jpeg62.dll and giflib4.dll and now my emacs supports jpg, gif and png files. 我为jpeg62.dll和giflib4.dll做了同样的事情，现在我的emacs支持jpg，gif和png文件。 For some reason it does not work if I simply put these dlls in the path. 由于某种原因，如果我只是将这些dll放在路径中，它就不起作用。

You can check (image-type-available-p 'png) to see if png is supported. 您可以检查(image-type-available-p 'png)以查看是否支持png。 image-library-alist maps image type to a list of dlls which support it. image-library-alist将图像类型映射到支持它的dll列表。

According to the official manual: 根据官方手册：

3.3 How do I get image support? 3.3如何获得图像支持？

Emacs has built in support for XBM and PBM/PGM/PPM images. Emacs内置了对XBM和PBM / PGM / PPM图像的支持。 This is sufficient to see the monochrome splash screen and tool-bar icons. 这足以看到单色闪屏和工具栏图标。 Since 22.2, the official precompiled binaries for Windows have bundled libXpm, which is required to display the color versions of those images. 从22.2开始，Windows的官方预编译二进制文件捆绑了libXpm，这需要显示这些图像的颜色版本。

Emacs is compiled to recognize JPEG, PNG, GIF and TIFF images also, but displaying these image types require external DLLs which are not bundled with Emacs. 编译Emacs也可识别JPEG，PNG，GIF和TIFF图像，但显示这些图像类型需要外部DLL，这些DLL不与Emacs捆绑在一起。 See Other useful ports. 请参阅其他有用端口。

Those dlls for the various image formats are (as far as I know) - XPM (xpm4.dll), PNG (libpng13.dll, zlib1.dll), JPEG (jpeg62.dll), TIFF (libtiff3.dll) and GIF (giflib4.dll); 那些用于各种图像格式的dll（据我所知） - XPM（xpm4.dll），PNG（libpng13.dll，zlib1.dll），JPEG（jpeg62.dll），TIFF（libtiff3.dll）和GIF（ giflib4.dll）;

Starting with Emacs 25 the Emacs Windows download directory includes -deps zip packages, that can be extracted to your emacs installation folder and include image libraries for PNG, SVG, JPEG, GIF, TIFF and more. 从Emacs 25开始，Emacs Windows下载目录包含-deps zip包，可以解压缩到您的emacs安装文件夹，包括PNG，SVG，JPEG，GIF，TIFF等图像库。

See also this emacs.stackexchange answer . 另请参阅此emacs.stackexchange答案。

要显示您的Emacs for Windows版本需要哪个版本的PNG dll，您可以评估(cdr (assq 'png dynamic-library-alist))