def test12_blend():
src = Struct()
src.append('a', Struct.Type.Float32)
src.append('b', Struct.Type.Float32)
target = Struct()
target.append('v', Struct.Type.Float32)
target.field('v').blend = [(3.0, 'a'), (4.0, 'b')]
s = StructConverter(
src,
target
)
check_conversion(s, '@ff', '@f',
(1.0, 2.0),
(3.0 + 8.0,))
src = Struct()
src.append('a', Struct.Type.UInt8, Struct.Flags.Normalized)
src.append('b', Struct.Type.UInt8, Struct.Flags.Normalized)
target = Struct()
target.append('v', Struct.Type.Float32)
target.field('v').blend = [(3.0, 'a'), (4.0, 'b')]
s = StructConverter(
src,
target
)
check_conversion(s, '@BB', '@f',
(255, 127),
(3.0 + 4.0 * (127.0 / 255.0),))
def test13_blend_gamma():
def to_srgb(value):
if value <= 0.0031308:
return 12.92 * value
return 1.055 * (value**(1.0 / 2.4)) - 0.055
def from_srgb(value):
if value <= 0.04045:
return value * 1.0 / 12.92
return ((value + 0.055) * (1.0 / 1.055))**2.4
src = Struct()
src.append('a', Struct.Type.UInt8,
Struct.Flags.Normalized | Struct.Flags.Gamma)
src.append('b', Struct.Type.UInt8,
Struct.Flags.Normalized | Struct.Flags.Gamma)
target = Struct()
target.append('v', Struct.Type.UInt8,
Struct.Flags.Normalized | Struct.Flags.Gamma)
target.field('v').blend = [(1, 'a'), (1, 'b')]
s = StructConverter(src, target)
ref = int(
np.round(
to_srgb(from_srgb(100 / 255.0) + from_srgb(200 / 255.0)) * 255))
check_conversion(s, '@BB', '@B', (100, 200), (ref, ))