except NotImplementedError:
raise SystemExit("For python 3.x, you need pycairo >= 1.11+ (from https://github.com/pygobject/pycairo)")
h = L.get_height()
w = L.get_width()
if h < H and w < W:
x0 = W//2 + (random.uniform()-.1)*50
y0 = H//2 + (random.uniform()-.1)*50
for dx,dy in spiral():
c = .25+.75*random.random()
x = int(x0+dx)
y = int(y0+dy)
checked = False
I.flush()
if not (x <= w//2 or y <= h//2 or x >= (W-w//2) or y >= (H-h//2)):
ndI = ndarray(shape=(h,w), buffer=I.get_data(), dtype=ubyte, order='C',
offset=(x-w//2) + I.get_stride() * (y-h//2),
strides=[I.get_stride(), 1])
ndL = ndarray(shape=(h,w), buffer=L.get_data(), dtype=ubyte, order='C',
strides=[L.get_stride(), 1])
if ((ndI * ndL).sum() == 0):
checked = True
new_region = RectangleInt(x-w//2, y-h//2, w, h)
if (checked or ( drawn_regions.contains_rectangle(new_region) == REGION_OVERLAP_OUT )):
ctxI.set_source_surface(L, 0, 0)
pattern = ctxI.get_source()
scalematrix = Matrix()
scalematrix.scale(1.0,1.0)
scalematrix.translate(w//2 - x, h//2 - y)
pattern.set_matrix(scalematrix)
ctxI.set_source_rgba(c,c,c,c)
ctxI.mask(pattern)
face.load_char('😀', freetype.FT_LOAD_COLOR)
bitmap = face.glyph.bitmap
width = face.glyph.bitmap.width
rows = face.glyph.bitmap.rows
# The line below depends on this assumption. Check.
if ( face.glyph.bitmap.pitch != width * 4 ):
raise RuntimeError('pitch != width * 4 for color bitmap: Please report this.')
bitmap = np.array(bitmap.buffer, dtype=np.uint8).reshape((bitmap.rows,bitmap.width,4))
I = ImageSurface(FORMAT_ARGB32, width, rows)
try:
ndI = np.ndarray(shape=(rows,width), buffer=I.get_data(),
dtype=np.uint32, order='C',
strides=[I.get_stride(), 4])
except NotImplementedError:
raise SystemExit("For python 3.x, you need pycairo >= 1.11+ (from https://github.com/pygobject/pycairo)")
# Although both are 32-bit, cairo is host-order while
# freetype is small endian.
ndI[:,:] = bitmap[:,:,3] * 2**24 + bitmap[:,:,2] * 2**16 + bitmap[:,:,1] * 2**8 + bitmap[:,:,0]
I.mark_dirty()
surface = ImageSurface(FORMAT_ARGB32, 2*width, rows)
ctx = Context(surface)
ctx.set_source_surface(I, 0, 0)
ctx.paint()
ctx.set_source_surface(I, width/2, 0)
def draw_triangle(target: cairo.ImageSurface, triangle, attributes,
texture: Texture):
# drop z coordinate
p0, p1, p2 = [p[:2] for p in triangle]
# compute area
area = edge(p0, p1, p2)
if area == 0:
return
width, height = resolution(target)
xmin = int(max(min(p0[0], p1[0], p2[0]), 0))
xmax = int(min(max(p0[0], p1[0], p2[0]), width))
ymin = int(max(min(p0[1], p1[1], p2[1]), 0))
ymax = int(min(max(p0[1], p1[1], p2[1]), height))
x, y = np.meshgrid(range(xmin, xmax), range(ymin, ymax), indexing='xy')
p = np.vstack([x.ravel(), y.ravel()]).T
# Barycentric coordinates are calculated as the areas of the three sub-triangles divided
# by the area of the whole triangle.
barycentric = np.vstack(
[edge(p1, p2, p), edge(p2, p0, p),
edge(p0, p1, p)]).T / area
# Find all indices of rows where all columns are positive
is_inside = np.all(barycentric >= 0, axis=-1)
# Compute indices of all points inside triangle
stride = np.array([4, target.get_stride()])
indices = np.dot(p[is_inside], stride)
# Interpolate vertex attributes
attrs = np.dot(barycentric[is_inside], attributes)
# Fill pixels
data = target.get_data()
for index, (u, v) in zip(indices, attrs):
r, g, b = texture(u, v)
data[index + 0] = r
data[index + 1] = g
data[index + 2] = b
dtype=ubyte,
order='C',
offset=1,
strides=[pitch, 3])
ndB = ndarray(shape=(rows, width),
buffer=copybuffer,
dtype=ubyte,
order='C',
offset=2,
strides=[pitch, 3])
try:
ndI = ndarray(shape=(rows, width),
buffer=I.get_data(),
dtype=uint32,
order='C',
strides=[I.get_stride(), 4])
except NotImplementedError:
raise SystemExit(
"For python 3.x, you need pycairo >= 1.11+ (from https://github.com/pygobject/pycairo)"
)
# 255 * 2**24 = opaque
ndI[:, :] = 255 * 2**24 + ndR[:, :] * 2**16 + ndG[:, :] * 2**8 + ndB[:, :]
I.mark_dirty()
surface = ImageSurface(FORMAT_ARGB32, 800, 600)
ctx = Context(surface)
ctx.set_source_surface(I, 0, 0)
pattern = ctx.get_source()
SurfacePattern.set_filter(pattern, FILTER_BEST)
scale = 480.0 / rows
