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Fatih Uzunoglu's avatar
Fatih Uzunoğlu authored
Partially changing a value type changes the whole value. In
image case, this means that the images can get re-loaded with
indeterminate size just to discard them after the size is
determined.

Fortunately this does not happen currently, because the sizes
are determined before the component is complete and QQuickImage
only loads if the component is complete.

However, due to the declarative nature of QML, bindings are
evaluated and assigned one by one, this means that source size
would be changed two times even if .width and .height are
pending re-evaluation at the same time (such as both depend on
DPR). At the same time, the order is also not defined, so
with such a setup as following:

sourceSize.width: width * eDPR
sourceSize.height: height * eDPR

When eDPR changes, Qt evaluates the binding for width or height,
adjusts sourceSize, sourceSize changes and change signal is signalled,
then evaluates the other sub-part of the value type (width or height),
adjusts sourceSize, sourceSize changes again and change signal is
signalled. Qt could technically optimize this, but as of Qt 6.8.1
it is not the case.

Meanwhile with the following:

sourceSize: Qt.size(width * eDPR, height * eDPR)

When eDPR changes, Qt evaluates the binding and adjusts the source
size, sourceSize changes and change signal is signalled. Source size
does not change two times, and the image would not be loaded two
times.
426d5085

VLC media player

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Source Code sitemap

ABOUT-NLS          - Notes on the Free Translation Project.
AUTHORS            - VLC authors.
COPYING            - The GPL license.
COPYING.LIB        - The LGPL license.
INSTALL            - Installation and building instructions.
NEWS               - Important modifications between the releases.
README             - Project summary.
THANKS             - VLC contributors.

bin/               - VLC binaries.
bindings/          - libVLC bindings to other languages.
compat/            - compatibility library for operating systems missing
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contrib/           - Facilities for retrieving external libraries and building
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doc/               - Miscellaneous documentation.
extras/analyser    - Code analyser and editor specific files.
extras/buildsystem - Different build system specific files.
extras/misc        - Files that don't fit in the other extras/ categories.
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extras/tools/      - Facilities for retrieving external building tools needed
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include/           - Header files.
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modules/           - VLC plugins and modules. Most of the code is here.
po/                - VLC translations.
share/             - Common resource files.
src/               - libvlccore source code.
test/              - Testing system.