def _init_alpha_checks(self):
"""Initialize the alpha check backgrounds"""
# Real: checkerboard pattern, rendered via Cairo
assert tiledsurface.N % gui.style.ALPHA_CHECK_SIZE == 0
N = tiledsurface.N
size = gui.style.ALPHA_CHECK_SIZE
nchecks = int(N / size)
cairo_surf = cairo.ImageSurface(cairo.FORMAT_ARGB32, N, N)
cr = cairo.Context(cairo_surf)
render_checks(cr, size, nchecks)
cairo_surf.flush()
# Real: MyPaint background surface for layers-but-no-bg rendering
pattern = cairo.SurfacePattern(cairo_surf)
pattern.set_extend(cairo.EXTEND_REPEAT)
self._real_alpha_check_pattern = pattern
# Fake: faster rendering, but ugly
tile = empty((N, N, 4), dtype='uint16')
f = 1 << 15
col1 = [int(f * c) for c in gui.style.ALPHA_CHECK_COLOR_1] + [f]
col2 = [int(f * c) for c in gui.style.ALPHA_CHECK_COLOR_2] + [f]
tile[:] = col1
for i in xrange(nchecks):
for j in xrange(nchecks):
if (i+j) % 2 == 0:
continue
tile[i*size:(i+1)*size, j*size:(j+1)*size] = col2
self._fake_alpha_check_tile = tile
def _init_alpha_check_bg(self):
"""Initialize the alpha check surface used for no-bg renderings"""
# Checkerboard pattern, rendered via Cairo
assert tiledsurface.N % _ALPHA_CHECK_SIZE == 0
N = tiledsurface.N
size = _ALPHA_CHECK_SIZE
nchecks = int(N / size)
cairo_surf = cairo.ImageSurface(cairo.FORMAT_ARGB32, N, N)
cr = cairo.Context(cairo_surf)
render_checks(cr, size, nchecks)
cairo_surf.flush()
# MyPaint background surface for layers-but-no-bg rendering
pattern = cairo.SurfacePattern(cairo_surf)
pattern.set_extend(cairo.EXTEND_REPEAT)
self._alpha_check_bg = pattern
def _init_alpha_check_bg(self):
"""Initialize the alpha check surface used for no-bg renderings"""
# Checkerboard pattern, rendered via Cairo
assert tiledsurface.N % _ALPHA_CHECK_SIZE == 0
N = tiledsurface.N
size = _ALPHA_CHECK_SIZE
nchecks = int(N / size)
cairo_surf = cairo.ImageSurface(cairo.FORMAT_ARGB32, N, N)
cr = cairo.Context(cairo_surf)
render_checks(cr, size, nchecks)
cairo_surf.flush()
# MyPaint background surface for layers-but-no-bg rendering
pattern = cairo.SurfacePattern(cairo_surf)
pattern.set_extend(cairo.EXTEND_REPEAT)
self._alpha_check_bg = pattern
