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Direct access to the screen

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linuxstb:
rb->lcd_framebuffer[] is what you need.  Various plugins use it.

It's important to note that this isn't the actual screen though - just an in-RAM copy of what is being displayed on the LCD.  To transfer the data to the LCD, call rb->lcd_update() or rb->lcd_update_rect()

It's also important to note that the format of the data in this array is device-dependent, so  if you want to bypass the graphics API in this way, you'll need different drawing code for different devices.  I don't think there's any documentation on the different lcd formats, but looking at firmware/export/lcd.h and firmware/drivers/lcd-*.c should help (as well as looking at other plugins).

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