Some systems such as micro-processor might not support
the thread feature on the system.
Enhance the portability by compiling the thorvg with toggling the
threading depepdency through the build option.
For this, thorvg newly introduced the internal Key/ScopedLock abstraction
for transparent thread-locking dependnecy.
To turn off the thread feature, please use the next build option:
$meson setup build -Dthreads=false ...
Note that, the thread feature is enabled in default.
Turning off the thread feature could reduce the binary size by 7kb.
issue: https://github.com/thorvg/thorvg/issues/1900
Introduced a dedicated mutex for each surface instance
to ensure safe sharing between the loader, renderer, and engine.
This enhancement allows for secure modification and access to bitmap data,
addressing potential concurrency issues.
Multiple Picture instances can now safely share a single loader instance,
optimizing performance.
This change builds upon the previous Loader Cache improvements:
ff6ea4b6c4
Unified common logic for scaled image raster operations,
Avoid on-spot pixel computation as possible.
Tested on local machine (single thread)
Lottie: 0.057s -> 0.053s (-0.004s)
The color conversion is supposed to take into account the differences between
straight alpha premultiplied color and pre-multiplied alpha color.
The previous logic does not perfectly cover these conditions.
The problem was occured in the thorvg viewer with a jpeg bgra format.
