mat_pretty_printer.py
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import gdb
import numpy as np
from enum import Enum
np.set_printoptions(suppress=True) # prevent numpy exponential notation on print, default False
# np.set_printoptions(threshold=sys.maxsize)
def conv(obj, t):
return gdb.parse_and_eval(f'({t})({obj})')
def booli(obj):
return conv(str(obj).lower(), 'bool')
def stri(obj):
s = f'"{obj}"'
return conv(s.translate(s.maketrans('\n', ' ')), 'char*')
class MagicValues(Enum):
MAGIC_VAL = 0x42FF0000
AUTO_STEP = 0
CONTINUOUS_FLAG = 1 << 14
SUBMATRIX_FLAG = 1 << 15
class MagicMasks(Enum):
MAGIC_MASK = 0xFFFF0000
TYPE_MASK = 0x00000FFF
DEPTH_MASK = 7
class Depth(Enum):
CV_8U = 0
CV_8S = 1
CV_16U = 2
CV_16S = 3
CV_32S = 4
CV_32F = 5
CV_64F = 6
CV_16F = 7
def create_enum(n):
def make_type(depth, cn):
return depth.value + ((cn - 1) << 3)
defs = [(f'{depth.name}C{i}', make_type(depth, i)) for depth in Depth for i in range(1, n + 1)]
return Enum('Type', defs)
Type = create_enum(512)
class Flags:
def depth(self):
return Depth(self.flags & MagicMasks.DEPTH_MASK.value)
def dtype(self):
depth = self.depth()
ret = None
if depth == Depth.CV_8U:
ret = (np.uint8, 'uint8_t')
elif depth == Depth.CV_8S:
ret = (np.int8, 'int8_t')
elif depth == Depth.CV_16U:
ret = (np.uint16, 'uint16_t')
elif depth == Depth.CV_16S:
ret = (np.int16, 'int16_t')
elif depth == Depth.CV_32S:
ret = (np.int32, 'int32_t')
elif depth == Depth.CV_32F:
ret = (np.float32, 'float')
elif depth == Depth.CV_64F:
ret = (np.float64, 'double')
elif depth == Depth.CV_16F:
ret = (np.float16, 'float16')
return ret
def type(self):
return Type(self.flags & MagicMasks.TYPE_MASK.value)
def channels(self):
return ((self.flags & (511 << 3)) >> 3) + 1
def is_continuous(self):
return (self.flags & MagicValues.CONTINUOUS_FLAG.value) != 0
def is_submatrix(self):
return (self.flags & MagicValues.SUBMATRIX_FLAG.value) != 0
def __init__(self, flags):
self.flags = flags
def __iter__(self):
return iter({
'type': stri(self.type().name),
'is_continuous': booli(self.is_continuous()),
'is_submatrix': booli(self.is_submatrix())
}.items())
class Size:
def __init__(self, ptr):
self.ptr = ptr
def dims(self):
return int((self.ptr - 1).dereference())
def to_numpy(self):
return np.array([int(self.ptr[i]) for i in range(self.dims())], dtype=np.int64)
def __iter__(self):
return iter({'size': stri(self.to_numpy())}.items())
class Mat:
def __init__(self, m, size, flags):
(dtype, ctype) = flags.dtype()
elsize = np.dtype(dtype).itemsize
ptr = m['data']
dataptr = int(ptr)
length = (int(m['dataend']) - dataptr) // elsize
start = (int(m['datastart']) - dataptr) // elsize
if length == 0:
self.mat = np.array([])
self.view = self.mat
return
if dtype != np.float16:
ctype = gdb.lookup_type(ctype)
ptr = ptr.cast(ctype.array(length - 1).pointer()).dereference()
self.mat = np.array([ptr[i] for i in range(length)], dtype=dtype)
else:
u16 = gdb.lookup_type('uint16_t')
ptr = ptr.cast(u16.array(length - 1).pointer()).dereference()
self.mat = np.array([ptr[i] for i in range(length)], dtype=np.uint16)
self.mat = self.mat.view(np.float16)
steps = np.asarray([int(m['step']['p'][i]) for i in range(size.dims())], dtype=np.int64)
self.view = np.lib.stride_tricks.as_strided(self.mat[start:], shape=size.to_numpy(), strides=steps)
def __iter__(self):
return iter({'data': stri(self.view)}.items())
class MatPrinter:
"""Print a cv::Mat"""
def __init__(self, mat):
self.mat = mat
def views(self):
m = self.mat
flags = Flags(int(m['flags']))
size = Size(m['size']['p'])
data = Mat(m, size, flags)
for x in [flags, size, data]:
for k, v in x:
yield 'view_' + k, v
def real(self):
m = self.mat
for field in m.type.fields():
k = field.name
v = m[k]
yield k, v
# TODO: add an enum in interface.h with all cv::Mat element types and use that instead
# yield 'test', gdb.parse_and_eval(f'(cv::MatTypes)0')
def children(self): # TODO: hide real members under new child somehow
yield from self.views()
yield from self.real()
def get_type(val):
# Get the type.
vtype = val.type
# If it points to a reference, get the reference.
if vtype.code == gdb.TYPE_CODE_REF:
vtype = vtype.target()
# Get the unqualified type, stripped of typedefs.
vtype = vtype.unqualified().strip_typedefs()
# Get the type name.
typename = vtype.tag
return typename
def mat_printer(val):
typename = get_type(val)
if typename is None:
return None
if str(typename) == 'cv::Mat':
return MatPrinter(val)
gdb.pretty_printers.append(mat_printer)