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"""Surface manipulation."""
from ..surface import SDL_CreateRGBSurfaceFrom
__all__ = ["subsurface"]
def subsurface(surface, area):
"""Creates a surface from a part of another surface.
The two surfaces share pixel data. The subsurface *must not* be used after
its parent has been freed!
"""
surface_format = surface.format[0]
subpixels = (surface.pixels + surface.pitch*area[1] +
surface_format.BytesPerPixel*area[0])
return SDL_CreateRGBSurfaceFrom(subpixels, area[2], area[3],
surface_format.BitsPerPixel,
surface.pitch, surface_format.Rmask,
surface_format.Gmask, surface_format.Bmask,
surface_format.Amask)[0]
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