FT800 Series Programmer Guide
Version 2.1
Document Reference No.: BRT_000030 Clearance No.: BRT#037
107
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4.16 BLEND_FUNC
Specify pixel arithmetic
Encoding
Parameters
src
Specifies how the source blending factor is computed. One of ZERO, ONE,
SRC_ALPHA, DST_ALPHA, ONE_MINUS_SRC_ALPHA or
ONE_MINUS_DST_ALPHA. The initial value is SRC_ALPHA (2).
dst
Specifies how the destination blending factor is computed, one of the same
constants as src. The initial value is ONE_MINUS_SRC_ALPHA(4)
Table 8 BLEND_FUNC constant value definition
NAME VALUE Description
ZERO 0
Description
The blend function controls how new color values are combined with the values
already in the color buffer. Given a pixel value source and a previous value in the
color buffer destination, the computed color is:
source × src + destination × dst
for each color channel: red, green, blue and alpha.
Examples
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