MobileRead Forums - View Single Post - image that overwrites others is not all black, shows ghost of prevous overlapping img

handyguy · 01-12-2020, 03:32 PM

Hi,
Wondering what the most efficient way to repeatedly write images to the same screen area is. After about 10-20 iterations, the character displayed is no longer solid black, but has lighter areas representative of the previous display in that area.
My current technique is to issue a single fbink with -c to clear the display then multiple fbink to display each alternate character sequentially:

Code:

fbink -1 character5.png -g x=700

Writing a blank image to the area prior to the desired character does then display a nice black character, but this seems inefficient:

Code:

fbink -1 blank.png -g x=700
fbink -1 character5.png -g x=700

Is there an optimal/efficient way to write an image to a subset of the screen (without loosing everything else that is not changing) ?

01-12-2020, 03:32 PM	#1
handyguy Connoisseur Posts: 70 Karma: 11789 Join Date: Dec 2019 Device: PW4	image that overwrites others is not all black, shows ghost of prevous overlapping img Hi, Wondering what the most efficient way to repeatedly write images to the same screen area is. After about 10-20 iterations, the character displayed is no longer solid black, but has lighter areas representative of the previous display in that area. My current technique is to issue a single fbink with -c to clear the display then multiple fbink to display each alternate character sequentially: Code: fbink -1 character5.png -g x=700 Writing a blank image to the area prior to the desired character does then display a nice black character, but this seems inefficient: Code: fbink -1 blank.png -g x=700 fbink -1 character5.png -g x=700 Is there an optimal/efficient way to write an image to a subset of the screen (without loosing everything else that is not changing) ? Attached Thumbnails Last edited by handyguy; 01-12-2020 at 04:45 PM.