def composite_tile_over(self, dst, tx, ty, mipmap_level=0, opacity=1.0, mode=0):
"""
composite one tile of this surface over the array dst, modifying only dst
"""
if self.mipmap_level < mipmap_level:
return self.mipmap.composite_tile_over(dst, tx, ty, mipmap_level, opacity)
if not (tx,ty) in self.tiledict:
return
src = self.get_tile_memory(tx, ty, readonly=True)
if dst.shape[2] == 4 and dst.dtype == 'uint16':
# rarely used (for merging layers, also when exporting a transparent PNGs)
# src (premultiplied) OVER dst (premultiplied)
# dstColor = srcColor + (1.0 - srcAlpha) * dstColor
one_minus_srcAlpha = (1<<15) - (opacity * src[:,:,3:4]).astype('uint32')
dst[:,:,:] = opacity * src[:,:,:] + ((one_minus_srcAlpha * dst[:,:,:]) >> 15).astype('uint16')
elif dst.shape[2] == 3 and dst.dtype == 'uint16':
mypaintlib.tile_composite_rgba16_over_rgb16(src, dst, opacity)
else:
raise NotImplementedError
def composite_array_src_over(dst, src, mipmap_level=0, opacity=1.0):
"""The default "svg:src-over" layer composite op implementation.
"""
if dst.shape[2] == 4 and dst.dtype == 'uint16':
# rarely used (for merging layers, also when exporting a transparent PNGs)
# src (premultiplied) OVER dst (premultiplied)
# cB = cA + (1.0 - aA) * cB
# where B = dst, A = src
srcAlpha = src[:,:,3:4].astype('float') * opacity / (1 << 15)
dstAlpha = dst[:,:,3:4].astype('float') / (1 << 15)
src_premult = src[:,:,0:3].astype('float') * opacity / (1<<15)
dst_premult = dst[:,:,0:3].astype('float') / (1<<15)
dst_c = clip(src_premult + (1.0 - srcAlpha) * dst_premult, 0.0, 1.0)
dst_a = clip(srcAlpha + dstAlpha - srcAlpha * dstAlpha, 0.0, 1.0)
dst[:,:,0:3] = clip(dst_c * (1<<15), 0, (1<<15) - 1).astype('uint16')
dst[:,:,3:4] = clip(dst_a * (1<<15), 0, (1<<15) - 1).astype('uint16')
elif dst.shape[2] == 3 and dst.dtype == 'uint16':
mypaintlib.tile_composite_rgba16_over_rgb16(src, dst, opacity)
else:
raise NotImplementedError
