Hi guys, I have use Qt 5.7 on Linux Embedded board (Toradex Apalis T30) with the EGLFS via X11 platform (NVidia drivers).
My QML application uses 24-bit PNG images. But I see that these images is looks like 16-bit (I see the gradients borders, and it looks ugly), howewer my X11 uses DefaultDepth == 24!!! Also this command: {quote} root@apalis-t30:~/deploy-apps# xdpyinfo | grep 'depth of root' depth of root window: 24 planes {quote} shows 24-bit mode too. Next, I have added this debug env variable: {quote} export QSG_INFO=1 {quote} to see what happens when my QML app starts: {quote} ... qt.scenegraph.general: threaded render loop qt.scenegraph.general: Using sg animation driver qt.scenegraph.general: Animation Driver: using vsync: 16.67 ms qt.scenegraph.general: Animation Driver: using vsync: 16.67 ms qt.scenegraph.general: texture atlas dimensions: 2048x2048 qt.scenegraph.general: R/G/B/A Buffers: 5 6 5 0 qt.scenegraph.general: Depth Buffer: 16 qt.scenegraph.general: Stencil Buffer: 8 qt.scenegraph.general: Samples: 0 qt.scenegraph.general: GL_VENDOR: NVIDIA Corporation qt.scenegraph.general: GL_RENDERER: NVIDIA Tegra 3 ... {quote} I see that OpenGL (yes?) initializes with the "R/G/B/A Buffers: 5 6 5 0" mode, that is 16-bit depth!!! O_O Next, I have tried to change the FB depth via: {quote} fbset -fb /dev/fb1 -depth 24 {quote} I see that FB changes own settings, but nothing changes when my app starts, it still shows images ugly, as 16-bit depth. Also I have tried to use QT_QPA_EGLFS_DEPTH variable (with 16, 24 or 32), but nothing changes, not helps. Helps only the QT_QPA_EGLFS_FORCE888 variable, but it introduces others bad issues, like the whole/half HDMI display flickering.. So, I can not to use QT_QPA_EGLFS_FORCE888.. So, is there are any tricks to use 24-bit depth? BR, Denis
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