[FEAT] Copy to clipboard as a bitmap image

[yutsuku]

Is your feature request related to a problem? Please describe.
Currently the program uses

QuickView/QuickView/main.cpp

Line 10815 in ddd8f63

case IDM_COPY_IMAGE: {

CF_HDROP format when setting the value for the clipboard, which may not be what other programs expect or even can handle.

Describe the solution you'd like
I would like the program to copy the image as a BITMAP image to my clipboard, or first frame in case the image is animated (apng, jxl, webp, possibly others). This way you can paste from the clipboard even to MS Paint.

Additional context
Additional setting could be added under Image section for this specific behaviour, in order to not break things for existing users.

Personally I use QuickView because it seems to be the only program that handles such wide range of modern image formats and its features, however pairing it with other software can be sometimes irritating if that software isn't ready for modern files. For example I use jxl to save screenshots, which is great for reducing space but not so great when I want to share those with anyone (in this exact case, via Discord - it lacks native support to inline display jxl).

[cmixed]

Support, but please don't limit it to CF_BITMAP.

CF_BITMAP has no alpha channel, a 4K screenshot balloons to 30MB+, and color management is completely lost. A better approach is to offer multiple clipboard formats:

PNG - the modern default; preserves transparency and ICC profiles
AVIF - some will like it (like me)
CF_DIBV5 - backwards-compatible but supports alpha
CF_BITMAP - strict fallback for legacy apps like MS Paint

[cmixed]

However, I have one concern: copying to the clipboard in another format is essentially implementing an image format conversion feature, which would increase the program's complexity. Moreover, it doesn't seem worthwhile to put in so much effort just for limited format conversion.

If this is to be implemented, perhaps offering a dedicated format conversion interface as a companion feature would be a more worthwhile approach — though that would also significantly increase complexity.

I personally use ImageMagick for format conversion; it's cross-platform and supports API calls. Of course, better alternatives are welcome too.

[cmixed]

Personally I use QuickView because it seems to be the only program that handles such wide range of modern image formats and its features, however pairing it with other software can be sometimes irritating if that software isn't ready for modern files. For example I use jxl to save screenshots, which is great for reducing space but not so great when I want to share those with anyone (in this exact case, via Discord - it lacks native support to inline display jxl).

For me, JXL has some color-related issues. When taking native screenshots in mpv, the color space comes out incorrect; compared to AVIF, the colors appear shifted. If you're planning to archive anything, it's worth keeping this in mind.