Just curious, is the approach in SRCOVER_MASKFILL faster? I think yes,
but it adds and an additional branches which can affect performance. Did
you measure the difference?
On 22.03.16 14:35, Prahalad Kumar Narayanan wrote:
Observation from SRCOVER_MASKFILL
1. The mask fill reduces computations by through multiple if(...)
conditions.
Each if condition affirms whether the next set of
computations are required.
2. Optimization 1: If mask value is 0- skip entire logic.
3. Optimization 2: If mask value is maximum, say 255, take srcA directly
without multiplying with maskAlpha ( Reason: 1 * srcAlpha = srcAlpha )
4. Optimization 3: Compute pre-multiplied resColor in two steps. First
with srcColor and then with dstColor.
If the resAlpha from 1st step (i.e., srcColor) is fully
opaque, avoid blending dstColor altogether.
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Best regards, Sergey.
