Add simple python3/ctypes bindings

Makefile

@@ -45,6 +45,13 @@ uninstall:
 	rm -f $(INCDIR)/libshapes.h
 	rm -f $(INCDIR)/fontinfo.h
 
+install-python:
+	cd python && python3 setup.py install --prefix=$(DEST)
+
+# Special target for checkinstall on debians, as install-python fails there normally
+install-checkinstall: install
+	cd python && install -m644 -p evg.py $(shell python3 -c 'import sys; print(sys.path[-1])')
+
 
 $(LIB): $(OBJ)
 	$(CC) $(LDFLAGS) -shared -o $@ $(OBJ)
@@ -61,4 +68,4 @@ $(FONTSRCDIR)/DejaVuSans.inc: $(OBJDIR)/font2openvg /usr/share/fonts/truetype/tt
 	$< $(word 2,$^) $@ DejaVuSans
 
 
-.PHONY: all clean install uninstall
+.PHONY: all clean install install-python install-checkinstall uninstall

python/evg.py

@@ -0,0 +1,113 @@
+import os, sys, re, ctypes as ct, functools as ft
+
+
+class LibShapes(object):
+
+	headers = '''
+		VGfloat TextHeight(Fontinfo *, int)
+		VGfloat TextDepth(Fontinfo *, int)
+		VGfloat TextWidth(char *, Fontinfo *, int)
+		RGBA(unsigned int, unsigned int, unsigned int, VGfloat, VGfloat[4])
+		RGB(unsigned int, unsigned int, unsigned int, VGfloat[4])
+
+		evgTranslate(VGfloat, VGfloat)
+		evgRotate(VGfloat)
+		evgShear(VGfloat, VGfloat)
+		evgScale(VGfloat, VGfloat)
+		evgText(VGfloat, VGfloat, char *, Fontinfo *, int)
+		evgTextMid(VGfloat, VGfloat, char *, Fontinfo *, int)
+		evgTextEnd(VGfloat, VGfloat, char *, Fontinfo *, int)
+		evgCbezier(VGfloat, VGfloat, VGfloat, VGfloat, VGfloat, VGfloat, VGfloat, VGfloat)
+		evgQbezier(VGfloat, VGfloat, VGfloat, VGfloat, VGfloat, VGfloat)
+		evgPolygon(VGfloat *, VGfloat *, VGint)
+		evgPolyline(VGfloat *, VGfloat *, VGint)
+		evgRect(VGfloat, VGfloat, VGfloat, VGfloat)
+		evgLine(VGfloat, VGfloat, VGfloat, VGfloat)
+		evgRoundRect(VGfloat, VGfloat, VGfloat, VGfloat, VGfloat, VGfloat)
+		evgEllipse(VGfloat, VGfloat, VGfloat, VGfloat)
+		evgCircle(VGfloat, VGfloat, VGfloat)
+		evgArc(VGfloat, VGfloat, VGfloat, VGfloat, VGfloat, VGfloat)
+		evgImage(VGfloat, VGfloat, int, int, char *)
+		evgBegin()
+		evgClear()
+		evgEnd()
+		evgSaveEnd(char *)
+		evgBackground(unsigned int, unsigned int, unsigned int)
+		evgBackgroundRGB(unsigned int, unsigned int, unsigned int, VGfloat)
+		evgInit(int *, int *)
+		evgFinish()
+		evgSetFill(VGfloat[4])
+		evgSetStroke(VGfloat[4])
+		evgStrokeWidth(VGfloat)
+		evgStroke(unsigned int, unsigned int, unsigned int, VGfloat)
+		evgFill(unsigned int, unsigned int, unsigned int, VGfloat)
+		evgFillLinearGradient(VGfloat, VGfloat, VGfloat, VGfloat, VGfloat *, int)
+		evgFillRadialGradient(VGfloat, VGfloat, VGfloat, VGfloat, VGfloat, VGfloat *, int)
+		evgClipRect(VGint x, VGint y, VGint w, VGint h)
+		evgClipEnd()
+		evgCbezierOutline(VGfloat, VGfloat, VGfloat, VGfloat, VGfloat, VGfloat, VGfloat, VGfloat)
+		evgQbezierOutline(VGfloat, VGfloat, VGfloat, VGfloat, VGfloat, VGfloat)
+		evgRectOutline(VGfloat, VGfloat, VGfloat, VGfloat)
+		evgRoundrectOutline(VGfloat, VGfloat, VGfloat, VGfloat, VGfloat, VGfloat)
+		evgEllipseOutline(VGfloat, VGfloat, VGfloat, VGfloat)
+		evgCircleOutline(VGfloat, VGfloat, VGfloat)
+		evgArcOutline(VGfloat, VGfloat, VGfloat, VGfloat, VGfloat, VGfloat)
+		evgClearRect(unsigned int x, unsigned int y, unsigned int w, unsigned int h)
+
+		evgInitWindowSize(int x, int y, unsigned int w, unsigned int h)
+		evgWindowOpacity(unsigned int alpha)
+		evgWindowPosition(int x, int y)'''
+
+	ptr = ct.POINTER
+	ref = ct.byref
+
+	c_int = ct.c_int
+	c_int_p = ptr(ct.c_int)
+	c_uint = ct.c_uint
+	c_uint_p = ptr(c_uint)
+	c_char_p = ct.c_char_p
+	vg_int = ct.c_int32
+	vg_float = ct.c_float
+	class evg_font(ct.Structure): pass
+
+	types_dict = dict(
+		VGint=vg_int, VGfloat=vg_float, VGfloat_a4=vg_float*4,
+		Fontinfo=evg_font, int=c_int, unsigned_int=c_uint, char_p=c_char_p )
+
+	def __init__(self):
+		self._lib = ct.CDLL('libshapes.so.1')
+		self.parse_signatures(self.headers)
+
+	def __getattr__(self, k):
+		# Keys are auto-translated from following formats:
+		#  evgFillLinearGradient, FillLinearGradient, fill_linear_gradient
+		#  evgBackgroundRGB, BackgroundRGB, background_rgb
+		if k.startswith('evg'): k = k[3:]
+		if k[0].isupper(): k = '_'.join(map(str.lower, re.findall(r'[A-Z]*[a-z0-9]*', k)))
+		if k.islower(): # nativ
+			k = ''.join((k.title() if k not in ['rgb', 'rgba'] else k.upper()) for k in k.split('_'))
+		func = getattr(self._lib, k, False)
+		return func or getattr(self._lib, 'evg' + k)
+
+	def parse_signatures(self, headers):
+		replace_multi = lambda s,reps: ft.reduce(lambda a,kv: a.replace(*kv), reps.items(), s)
+		type_key = lambda s: replace_multi('_'.join(s), {'*':'p','[':'_a',']':''})
+		for line in filter(None, map(str.strip, headers.splitlines())):
+			m = re.search(r'^(?:([\w\d]+)\s+)?([\w\d]+)\((.*)\)$', line)
+			if not m: raise ValueError('Failed to parse signature: {!r}'.format(line))
+			res, func, sig = m.groups()
+			func = getattr(self, func)
+			if res: func.restype = self.types_dict[res]
+			args = list(map(str.strip, sig.split(','))) if sig else list()
+			for n, arg_str in enumerate(args):
+				arg = arg_str.split()
+				ptr = t = None
+				while arg:
+					t = self.types_dict.get(type_key(arg))
+					if t: break
+					if arg[-1] == '*': ptr = True
+					arg.pop()
+				if not t: raise ValueError('Failed to parse type: {!r}'.format(arg_str))
+				if ptr: t = self.ptr(t)
+				args[n] = t
+			func.argtypes = args

python/setup.py

@@ -0,0 +1,13 @@
+#!/usr/bin/env python3
+
+from distutils.core import setup
+
+setup(
+	name = 'evg',
+	version = '0.0.1',
+	author = 'Mike Kazantsev',
+	author_email = 'mk.fraggod@gmail.com',
+	license = 'MIT',
+	url = 'https://github.com/mk-fg/easy-vg',
+	description = 'Python3 easy-vg/libshapes OpenVG wrapper.',
+	py_modules = ['evg'] )