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QImageReader documentation update [ci skip]

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Signed-off-by: Ivailo Monev <xakepa10@gmail.com>
This commit is contained in:
Ivailo Monev 2021-09-16 13:46:21 +03:00
parent 1974bc0dea
commit 59f0d21c61
1 changed files with 11 additions and 18 deletions
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29
src/gui/image/qimagereader.cpp
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@ -427,28 +427,22 @@ QByteArray QImageReader::format() const
it is disabled. By default, autodetection is enabled.
QImageReader uses an extensive approach to detecting the image format;
firstly, if you pass a file name to QImageReader, it will attempt to
detect the file extension if the given file name does not point to an
existing file, by appending supported default extensions to the given file
name, one at a time. It then uses the following approach to detect the
image format:
firstly, if you pass a file name to QImageReader. It uses the following
approach to detect the image format:
\list
\o Image plugins are queried first, based on either the optional format
string, or the file name suffix (if the source device is a file). No
content detection is done at this stage. QImageReader will choose the
first plugin that supports reading for this format.
\o Built-in handlers are checked based on format string.
\o If no plugin supports the image format, Qt's built-in handlers are
checked based on either the optional format string, or the file name
suffix.
\o If no built-in image handler recognizes the format and auto detection
is enabled the image contents is inspected.
\o If no capable plugins or built-in handlers are found, each plugin is
tested by inspecting the content of the data stream.
\o Image plugins are queried based on the format string. No content
detection is done at this stage. QImageReader will choose the first
plugin that supports reading for this format.
\o If no plugins could detect the image format based on data contents,
each built-in image handler is tested by inspecting the contents.
\o If no capable plugins handlers are found, each plugin is tested by
inspecting the content.
\o Finally, if all above approaches fail, QImageReader will report failure
when trying to read the image.
@ -456,8 +450,7 @@ QByteArray QImageReader::format() const
\endlist
By disabling image format autodetection, QImageReader will only query the
plugins and built-in handlers based on the format string (i.e., no file
name extensions are tested).
plugins and built-in handlers based on the format string.
\sa QImageIOHandler::canRead(), QImageIOPlugin::capabilities()
*/