def set_clip(self, rect):
""" set_clip(rect) -> None
set the current clipping area of the Surface
"""
self.check_surface()
if rect:
sdlrect = ffi.new('SDL_Rect*')
sdlrect.x, sdlrect.y, sdlrect.w, sdlrect.h = \
rect_vals_from_obj(rect)
res = sdl.SDL_SetClipRect(self._c_surface, sdlrect)
else:
res = sdl.SDL_SetClipRect(self._c_surface, ffi.NULL)
if res == -1:
raise SDLError.from_sdl_error()
def blit(self, source, dest, area=None, special_flags=0):
""" blit(source, dest, area=None, special_flags = 0) -> Rect
draw one image onto another
"""
if not self._c_surface or not source._c_surface:
raise SDLError("display Surface quit")
if self.is_pure_opengl():
raise SDLError("Cannot blit to OPENGL Surfaces (OPENGLBLIT is ok)")
srcrect = ffi.new('SDL_Rect*')
destrect = ffi.new('SDL_Rect*')
if area is not None:
srcrect.x, srcrect.y, srcrect.w, srcrect.h = \
rect_vals_from_obj(area)
else:
srcrect.w = source._w
srcrect.h = source._h
if isinstance(dest, tuple) and len(dest) == 2:
destrect.x = int(dest[0])
destrect.y = int(dest[1])
destrect.w = source._w
destrect.h = source._h
else:
destrect.x, destrect.y, destrect.w, destrect.h = \
rect_vals_from_obj(dest)
c_dest = self._c_surface
c_src = source._c_surface
c_subsurface = None
flags = special_flags
if self.subsurfacedata:
owner = self.subsurfacedata.owner
c_subsurface = owner._c_surface
suboffsetx = self.subsurfacedata.xoffset
suboffsety = self.subsurfacedata.yoffset
while owner.subsurfacedata:
subdata = owner.subsurfacedata
owner = subdata.owner
c_subsurface = owner._c_surface
suboffsetx += subdata.xoffset
suboffsety += subdata.yoffset
orig_clip = ffi.new('SDL_Rect*')
sub_clip = ffi.new('SDL_Rect*')
sdl.SDL_GetClipRect(c_subsurface, orig_clip)
sdl.SDL_GetClipRect(self._c_surface, sub_clip)
sub_clip[0].x += suboffsetx
sub_clip[0].y += suboffsety
sdl.SDL_SetClipRect(c_subsurface, sub_clip)
destrect.x += suboffsetx
destrect.y += suboffsety
c_dest = c_subsurface
# TODO: implement special blend flags
# these checks come straight from pygame - copied comments
if (c_dest.format.Amask and (c_dest.flags & sdl.SDL_SRCALPHA)
and not (c_src.format.Amask
and not (c_src.flags & sdl.SDL_SRCALPHA))
and (c_dest.format.BytesPerPixel == 2
or c_dest.format.BytesPerPixel == 4)):
# SDL works for 2 and 4 bytes
res = sdl.pygame_Blit(c_src, srcrect, c_dest, destrect, flags)
elif flags or (c_src.flags & (sdl.SDL_SRCALPHA | sdl.SDL_SRCCOLORKEY)
and c_dest.pixels == c_src.pixels
and check_surface_overlap(c_src, srcrect, c_dest,
destrect)):
'''
This simplification is possible because a source subsurface
is converted to its owner with a clip rect and a dst
subsurface cannot be blitted to its owner because the
owner is locked.
'''
res = sdl.pygame_Blit(c_src, srcrect, c_dest, destrect, flags)
# can't blit alpha to 8bit, crashes SDL
elif (c_dest.format.BytesPerPixel == 1
and (c_src.format.Amask or c_src.flags & sdl.SDL_SRCALPHA)):
if c_src.format.BytesPerPixel == 1:
res = sdl.pygame_Blit(c_src, srcrect, c_dest, destrect, 0)
elif sdl.SDL_WasInit(sdl.SDL_INIT_VIDEO):
# TODO: SDL_DisplayFormat segfaults
c_src = sdl.SDL_DisplayFormat(c_src)
if c_src:
res = sdl.SDL_BlitSurface(c_src, srcrect, c_dest, destrect)
sdl.SDL_FreeSurface(c_src)
else:
res = -1
else:
raise NotImplementedError()
else:
res = sdl.SDL_BlitSurface(c_src, srcrect, c_dest, destrect)
if c_subsurface:
sdl.SDL_SetClipRect(c_subsurface, orig_clip)
destrect.x -= suboffsetx
destrect.y -= suboffsety
else:
# TODO: prep/unprep
pass
if res == -1:
raise SDLError.from_sdl_error()
elif res == -2:
raise SDLError("Surface was lost")
return Rect._from4(destrect.x, destrect.y, destrect.w, destrect.h)