137 lines
4.0 KiB
Cython
137 lines
4.0 KiB
Cython
import multiprocessing
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from PIL import Image # type: ignore
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from typing import Optional, Tuple
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from ..types import Color, Matrix, Point
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cdef extern struct floatcolor_t:
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float r;
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float g;
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float b;
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float a;
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cdef extern struct matrix_t:
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float a;
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float b;
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float c;
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float d;
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float tx;
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float ty;
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cdef extern struct point_t:
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float x;
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float y;
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cdef extern int affine_composite_fast(
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unsigned char *imgdata,
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unsigned char *maskdata,
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unsigned int imgwidth,
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unsigned int imgheight,
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unsigned int minx,
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unsigned int maxx,
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unsigned int miny,
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unsigned int maxy,
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floatcolor_t add_color,
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floatcolor_t mult_color,
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matrix_t inverse,
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int blendfunc,
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unsigned char *texdata,
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unsigned int texwidth,
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unsigned int texheight,
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unsigned int threads,
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unsigned int enable_aa,
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)
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def affine_composite(
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img: Image.Image,
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add_color: Color,
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mult_color: Color,
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transform: Matrix,
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mask: Optional[Image.Image],
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blendfunc: int,
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texture: Image.Image,
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single_threaded: bool = False,
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enable_aa: bool = True,
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) -> Image.Image:
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# Calculate the inverse so we can map canvas space back to texture space.
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try:
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inverse = transform.inverse()
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except ZeroDivisionError:
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# If this happens, that means one of the scaling factors was zero, making
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# this object invisible. We can ignore this since the object should not
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# be drawn.
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return img
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if blendfunc not in {0, 1, 2, 3, 8, 9, 70, 256, 257}:
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print(f"WARNING: Unsupported blend {blendfunc}")
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return img
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# These are calculated properties and caching them outside of the loop
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# speeds things up a bit.
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imgwidth = img.width
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imgheight = img.height
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texwidth = texture.width
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texheight = texture.height
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# Calculate the maximum range of update this texture can possibly reside in.
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pix1 = transform.multiply_point(Point.identity())
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pix2 = transform.multiply_point(Point.identity().add(Point(texwidth, 0)))
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pix3 = transform.multiply_point(Point.identity().add(Point(0, texheight)))
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pix4 = transform.multiply_point(Point.identity().add(Point(texwidth, texheight)))
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# Map this to the rectangle we need to sweep in the rendering image.
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minx = max(int(min(pix1.x, pix2.x, pix3.x, pix4.x)), 0)
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maxx = min(int(max(pix1.x, pix2.x, pix3.x, pix4.x)) + 1, imgwidth)
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miny = max(int(min(pix1.y, pix2.y, pix3.y, pix4.y)), 0)
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maxy = min(int(max(pix1.y, pix2.y, pix3.y, pix4.y)) + 1, imgheight)
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if maxx <= minx or maxy <= miny:
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# This image is entirely off the screen!
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return img
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# Grab the raw image data.
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imgbytes = img.tobytes('raw', 'RGBA')
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texbytes = texture.tobytes('raw', 'RGBA')
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# Grab the mask data.
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if mask is not None:
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alpha = mask.split()[-1]
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maskdata = alpha.tobytes('raw', 'L')
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else:
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maskdata = None
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cdef unsigned char *maskbytes = NULL
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if maskdata is not None:
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maskbytes = maskdata
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# Convert classes to C structs.
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cdef floatcolor_t c_addcolor = floatcolor_t(r=add_color.r, g=add_color.g, b=add_color.b, a=add_color.a)
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cdef floatcolor_t c_multcolor = floatcolor_t(r=mult_color.r, g=mult_color.g, b=mult_color.b, a=mult_color.a)
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cdef matrix_t c_inverse = matrix_t(a=inverse.a, b=inverse.b, c=inverse.c, d=inverse.d, tx=inverse.tx, ty=inverse.ty)
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cdef unsigned int threads = 1 if single_threaded else multiprocessing.cpu_count()
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# Call the C++ function.
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errors = affine_composite_fast(
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imgbytes,
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maskbytes,
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imgwidth,
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imgheight,
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minx,
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maxx,
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miny,
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maxy,
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c_addcolor,
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c_multcolor,
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c_inverse,
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blendfunc,
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texbytes,
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texwidth,
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texheight,
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threads,
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1 if enable_aa else 0,
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)
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if errors != 0:
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raise Exception("Error raised in C++!")
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# We blitted in-place, return that.
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return Image.frombytes('RGBA', (imgwidth, imgheight), imgbytes)
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