Add a set of APIs for colour filling with alpha gradient

ARM-software / Arm-2D

2D Graphic Library optimized for Cortex-M processors

Apache License 2.0

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Add a set of APIs for colour filling with alpha gradient #20

Closed GorgonMeducer closed 3 months ago

GorgonMeducer commented 1 year ago

Filling-colour-with-gradient-opacity is a valuable tool when creating visual elements; it is commonly used in drawing backgrounds for panels, widgets etc. The following features should be taken into consideration when adding this set of APIs:

Support 2/3/4 points gradient mode
Have variants to support mask (on the target side)
Have variants to support an extra opacity

GorgonMeducer commented 3 months ago

The following API variants have been added:

fill colour with 4pts alpha gradient
fill colour with 4pts alpha gradient and opacity
fill colour with 3pts alpha gradient
fill colour with 3pts alpha gradient and opacity
fill colour with horizontal alpha gradient
fill colour with horizontal alpha gradient and opacity
fill colour with vertical alpha gradient
fill colour with vertical alpha gradient and opacity

GorgonMeducer commented 3 months ago

The following variants have been added:

fill colour with 4pts alpha gradient and mask
fill colour with 4pts alpha gradient mask and opacity
fill colour with 3pts alpha gradient and mask
fill colour with 3pts alpha gradient mask and opacity
fill colour with horizontal alpha gradient and mask
fill colour with horizontal alpha gradient mask and opacity
fill colour with vertical alpha gradient and mask
fill colour with vertical alpha gradient mask and opacity