def make_image_surface(bitmap, copy=True):
if (type(bitmap) == FT_Bitmap):
# bare FT_Bitmap
content = bitmap
else:
# wrapped Bitmap instance
content = bitmap._FT_Bitmap
"creates a Cairo ImageSurface containing (a copy of) the Bitmap pixels."
if content.pixel_mode == FT_PIXEL_MODE_MONO:
cairo_format = FORMAT_A1
elif content.pixel_mode == FT_PIXEL_MODE_GRAY:
cairo_format = FORMAT_A8
else:
raise NotImplementedError("unsupported bitmap format %d" %
content.pixel_mode)
src_pitch = content.pitch
dst_pitch = ImageSurface.format_stride_for_width(cairo_format,
content.width)
if not copy and dst_pitch == src_pitch and content.buffer != None:
pixels = content.buffer
else:
pixels = to_array(content, content.pixel_mode, dst_pitch)
result = ImageSurface.create_for_data(pixels, cairo_format, content.width,
content.rows, dst_pitch)
return result
def func(image, objects, *args, **kwargs):
# Allow sending in a single object in every function.
if not (isinstance(objects, list) or isinstance(objects, tuple)):
objects = [objects]
# Calculate the appropriate scaling for the markers.
area = image.shape[1] * image.shape[0]
for ref_area, scale in MARKER_SCALES:
if area >= ref_area:
break
# TODO: Ideally, we would like to avoid having to create a copy of the
# array just to add paddings to support the cairo format, but there's
# no way to use a cairo surface with 24bpp.
# TODO: Take into account endianness of the machine, as it's possible
# it has to be concatenated in the other order in some machines.
# We need to add an extra `alpha` layer, as cairo only supports 32 bits
# per pixel formats, and our numpy array uses 24. This means creating
# one copy before modifying and a second copy afterwards.
with_alpha = np.concatenate([
image[..., ::-1], 255 * np.ones(
(image.shape[0], image.shape[1], 1), dtype=np.uint8)
],
axis=2)
surface = ImageSurface.create_for_data(with_alpha, cairo.Format.RGB24,
image.shape[1], image.shape[0])
ctx = Context(surface)
# Set up the font. If not available, will default to a Sans Serif
# font available in the system, so no need to have fallbacks.
ctx.select_font_face("DejaVuSans-Bold", cairo.FONT_SLANT_NORMAL,
cairo.FONT_WEIGHT_NORMAL)
ctx.set_font_size(int(16 * scale))
vis_func(ctx, objects, scale=scale, *args, **kwargs)
# Return the newly-drawn image, excluding the extra alpha channel
# added.
image = with_alpha[..., :-1][..., ::-1]
return image
def _make_image_surface(bitmap, copy=True):
"""Convert FreeType bitmap to Cairo ImageSurface.
Special thanks to Hintak and his example code:
https://github.com/rougier/freetype-py/blob/master/examples/bitmap_to_surface.py
TODO (M Foley) understand this better and see if a more elegant
solution exists."""
content = bitmap._FT_Bitmap
cairo_format = FORMAT_A8
src_pitch = content.pitch
dst_pitch = ImageSurface.format_stride_for_width(cairo_format,
content.width)
pixels = _to_array(content, content.pixel_mode, dst_pitch)
result = ImageSurface.create_for_data(pixels, cairo_format, content.width,
content.rows, dst_pitch)
return result
def make_image_surface(bitmap, copy=True):
if (type(bitmap) == FT_Bitmap):
# bare FT_Bitmap
content = bitmap
else:
# wrapped Bitmap instance
content = bitmap._FT_Bitmap
"creates a Cairo ImageSurface containing (a copy of) the Bitmap pixels."
if (False and (byteorder == 'little')
and (content.pixel_mode == FT_PIXEL_MODE_MONO)):
try:
libtiff = CDLL("not")
except:
library = get_handle()
dest = c_void_p()
error = FT_Bitmap_Init(dest)
if error: raise FT_Exception(error)
error = FT_Bitmap_Convert(library, byref(content), dest, 1)
if error: raise FT_Exception(error)
content = dest
if content.pixel_mode == FT_PIXEL_MODE_MONO:
cairo_format = FORMAT_A1
elif content.pixel_mode == FT_PIXEL_MODE_GRAY:
cairo_format = FORMAT_A8
else:
raise NotImplementedError("unsupported bitmap format %d" %
content.pixel_mode)
src_pitch = content.pitch
dst_pitch = ImageSurface.format_stride_for_width(cairo_format,
content.width)
if not copy and dst_pitch == src_pitch and content.buffer != None:
pixels = content.buffer
else:
pixels = to_array(content, content.pixel_mode, dst_pitch)
result = ImageSurface.create_for_data(pixels, cairo_format, content.width,
content.rows, dst_pitch)
return result
