This all is not about my question in any matter. I do not care about SVG
at all. And SVG are not used in this example.
Please learn to read question before answering....
On 3/23/2021 4:16 PM, Jérôme Godbout wrote:
Do you really need to same memory by reducing the source size? I think
you should left the source size alone and sample the image from the
full source. Source size for SVG doesn’t make any sense, it’s
vectoriel, doesn’t have any size, it can scale to any dimension. When
playing with the image size (not the source) it will sample the source
for each pixel, not sure about the algorithm but you might need an
higher source resolution to get a proper image without artifact. I
would at least take the Screen.devicePixelRatio into the source size
into account and even add a x2 to ensure proper sampling, but I don’t
see any real advantage to play with the source size unless you really
are consuming way too much memory.
This might slow you down if the same image is using different sourceSize:
Note: /Changing this property dynamically causes the image source to
be reloaded, potentially even from the network, if it is not in the
disk cache./
/
/
On Mar 23, 2021, at 3:31 AM, Alexander Dyagilev <alervd...@gmail.com
<mailto:alervd...@gmail.com>> wrote:
Hello,
We had a strange problem with blurred images under Retina displays.
Left part of the image - before, right one - after the fix.
<pjcgokflkeakcklh.png>
Our QML code was using with to show images:
Image{
anchors.verticalCenter:parent.verticalCenter
sourceSize.width:25
sourceSize.height:25
source:preview.url
}
I've tried to multiply sourceSize by Screen.devicePixelRatio - images
became bigger so they did not fit their places.
Then I've replaced sourceSize.width with just width and the same for
height. And it works fine now.
My questions is:
1) Is it required to multiply sourceSize by devicePixelRatio? Or is
it managed automatically? It seems that it is managed automatically
for PNG and NOT managed for SVG.
2) If it is already managed automatically for PNG (these images
preview.url are PNGs) then why was it blurred? The original PNG image
is of size 64x64 pixels under Retina displays.
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