263 lines
9.3 KiB
Python
263 lines
9.3 KiB
Python
import ctypes as ct
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from floatimg.settings import LIB
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############################################################################################################
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# type constants
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GRAY = 1
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RGB = 3
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RGBA = 4
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RGBZ = 99
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############################################################################################################
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# Type mapping
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class C_FloatImg(ct.Structure):
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"""mapping to the C structure of FloatImg"""
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pass
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C_FloatImg._fields_ = [
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("magic", ct.c_ulong),
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("width", ct.c_int),
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("height", ct.c_int),
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("type", ct.c_int),
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("fval", ct.c_float),
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("count", ct.c_int),
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("R", ct.POINTER(ct.c_float)),
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("G", ct.POINTER(ct.c_float)),
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("B", ct.POINTER(ct.c_float)),
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("A", ct.POINTER(ct.c_float)),
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("reserved", ct.c_int),
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]
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############################################################################################################
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# declaration of input / output types
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c_fimgcreate = LIB.fimg_create
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c_fimgcreate.argtypes = (ct.POINTER(C_FloatImg), ct.c_int, ct.c_int, ct.c_int)
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c_fimgcreate.restype = ct.c_int
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c_fimg_destroy = LIB.fimg_destroy
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c_fimg_destroy.argtypes = (ct.POINTER(C_FloatImg),)
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c_fimg_destroy.restype = ct.c_int
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c_fimg_clone = LIB.fimg_clone
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c_fimg_clone.argtypes = (ct.POINTER(C_FloatImg), ct.POINTER(C_FloatImg))
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c_fimg_clone.restype = ct.c_int
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c_fimg_copy_data = LIB.fimg_copy_data
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c_fimg_copy_data.argtypes = (ct.POINTER(C_FloatImg), ct.POINTER(C_FloatImg))
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c_fimg_copy_data.restype = ct.c_int
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c_fimg_type_is_valid = LIB.fimg_type_is_valid
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c_fimg_type_is_valid.argtypes = (ct.c_int,)
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c_fimg_copy_data.restype = ct.c_int
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c_fimg_str_type = LIB.fimg_str_type
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c_fimg_str_type.argtypes = (ct.c_int,)
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c_fimg_str_type.restype = ct.c_char_p
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c_fimg_clear = LIB.fimg_clear
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c_fimg_clear.argtypes = (ct.POINTER(C_FloatImg),)
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c_fimg_clear.restype = ct.c_int
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c_fimg_plot_rgb = LIB.fimg_plot_rgb
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c_fimg_plot_rgb.argtypes = (
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ct.POINTER(C_FloatImg),
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ct.c_int,
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ct.c_int,
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ct.c_float,
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ct.c_float,
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ct.c_float,
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)
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c_fimg_plot_rgb.restype = ct.c_int
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# int fimg_get_rgb(FloatImg *head, int x, int y, float *rgb);
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c_fimg_get_rgb = LIB.fimg_get_rgb
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c_fimg_get_rgb.argtypes = (
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ct.POINTER(C_FloatImg),
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ct.c_int,
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ct.c_int,
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ct.POINTER(ct.c_float * 3),
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)
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c_fimg_get_rgb.restype = ct.c_int
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# int fimg_put_rgb(FloatImg *head, int x, int y, float *rgb);
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c_fimg_put_rgb = LIB.fimg_put_rgb
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c_fimg_put_rgb.argtypes = (
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ct.POINTER(C_FloatImg),
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ct.c_int,
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ct.c_int,
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ct.POINTER(ct.c_float * 3),
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)
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c_fimg_put_rgb.restype = ct.c_int
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c_fimg_rgb_constant = LIB.fimg_rgb_constant
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c_fimg_rgb_constant.argtypes = (
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ct.POINTER(C_FloatImg),
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ct.c_float,
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ct.c_float,
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ct.c_float,
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)
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c_fimg_rgb_constant.restype = ct.c_int
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c_fimg_dump_to_file = LIB.fimg_dump_to_file
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c_fimg_dump_to_file.argtypes = (ct.POINTER(C_FloatImg), ct.c_char_p, ct.c_int)
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c_fimg_dump_to_file.restype = ct.c_int
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c_fimg_load_from_dump = LIB.fimg_load_from_dump
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c_fimg_load_from_dump.argtypes = (ct.c_char_p, ct.POINTER(C_FloatImg))
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c_fimg_load_from_dump.restype = ct.c_int
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c_fimg_fileinfos = LIB.fimg_fileinfos
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c_fimg_fileinfos.argtypes = (ct.c_char_p, ct.POINTER(ct.c_int * 3))
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c_fimg_fileinfos.restype = ct.c_int
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############################################################################################################
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class FloatImg:
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"""
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Pythonic Object-Oriented encapsulation of floatimg library
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:attr c_img: an instance of C_FloatImg structure
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:attr c_img: an pointer to the c_img structure
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"""
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# proxy attributes to the C_FloatImg structure
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magic = property(lambda self: self.c_img.magic)
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width = property(lambda self: self.c_img.width)
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height = property(lambda self: self.c_img.height)
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type_id = property(lambda self: self.c_img.type)
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fval = property(lambda self: self.c_img.fval)
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count = property(lambda self: self.c_img.count)
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# oh yeah, really really sluggish access to pixels img.R[0].contents
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# however, pixel data are not designed to be accessed this way
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R = property(
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lambda self: pointer(self.c_img.contents.R)[: self.width * self.height]
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)
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#######################################################################################################
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def __init__(self, c_img):
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self.c_img = c_img
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self.c_img_p = ct.pointer(c_img)
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#######################################################################################################
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def __str__(self):
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return f"<{self.__class__.__name__} instance {id(self)} width={self.width} height={self.height} type={self.str_type}>"
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#######################################################################################################
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def destroy(self):
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"""destroy the underlying structure. automattically called at instance destruction"""
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assert c_fimg_destroy(self.c_img) == 0
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#######################################################################################################
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def __del__(self):
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self.destroy()
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#######################################################################################################
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def clear(self):
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"""clear data"""
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return c_fimg_clear(self.c_img_p)
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#######################################################################################################
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def clone(self, flags=0):
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"""return a clone of the current instance"""
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new_pic = C_FloatImg()
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assert c_fimg_clone(self.c_img_p, ct.pointer(new_pic), flags) == 0
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return FloatImg(new_pic)
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#######################################################################################################
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def copy_data(self, to_img):
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assert c_fimg_copy_data(self.c_img_p, to_img.c_img_p) == 0
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#######################################################################################################
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@property
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def str_type(self):
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"""return the type of the image as a string"""
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return c_fimg_str_type(self.c_img.type).decode("utf-8")
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#######################################################################################################
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def rgb_constant(self, r, v, b):
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assert c_fimg_rgb_constant(self.c_img_p, r, v, b) == 0
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#######################################################################################################
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def get_rgb(self, x, y):
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"""get r,g,b triplet from a pixel"""
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rgb = (ct.c_float * 3)()
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assert c_fimg_get_rgb(self.c_img_p, x, y, ct.pointer(rgb)) == 0
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return rgb[:3]
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#######################################################################################################
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def put_rgb(self, x, y, rgb):
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"""put r,g,b triplet to a pixel"""
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# TODO may be a better way to create the array rather than iterating
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c_rgb = (ct.c_float * 3)()
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for i, c in enumerate(rgb):
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c_rgb[i] = c
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assert c_fimg_put_rgb(self.c_img_p, x, y, ct.pointer(c_rgb)) == 0
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#######################################################################################################
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def dump_to_file(self, fname):
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"""save data to a dump file"""
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# TODO use system encoding instead of utf-8
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assert (
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c_fimg_dump_to_file(
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self.c_img_p, ct.c_char_p(bytes(fname, encoding="utf8")), 0
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)
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== 0
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)
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#######################################################################################################
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def load_from_dump(self, fname):
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"""load data from a dump. size and type have to be compatible"""
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assert (
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c_fimg_load_from_dump(
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ct.c_char_p(bytes(fname, encoding="utf8")), self.c_img_p
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)
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== 0
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)
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###########################################################################################################
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def fileinfos(fname):
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"""return witdh, height, img_type triplet read from a dump file"""
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datas = (ct.c_int * 3)()
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assert (
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c_fimg_fileinfos(ct.c_char_p(bytes(fname, encoding="utf8")), ct.pointer(datas))
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== 0
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)
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return datas[:3]
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###########################################################################################################
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def create(witdh, height, type_id):
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"""create an new FloatImg instance"""
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assert type_is_valid(type_id)
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img = C_FloatImg()
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assert c_fimgcreate(ct.pointer(img), witdh, height, type_id) == 0
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return FloatImg(img)
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###########################################################################################################
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def create_rgb(witdh, height):
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"""create a new rgb instance """
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return create(witdh, height, RGB)
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###########################################################################################################
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def create_from_dump(fname):
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"""Create a new instance from a dump file"""
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witdh, height, img_type = fileinfos(fname)
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img = create(witdh, height, img_type)
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img.load_from_dump(fname)
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return img
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###########################################################################################################
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def type_is_valid(type_id):
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"""return True if type_id is a valid one"""
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return c_fimg_type_is_valid(type_id) == 1
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