393 lines
16 KiB
Python
393 lines
16 KiB
Python
import multiprocessing
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import signal
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from PIL import Image # type: ignore
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from typing import Any, List, Optional, Sequence
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from .types.generic import Color, Matrix, Point
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# If we compiled the faster cython code, we can use it instead!
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try:
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from .blendalt import affine_composite
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except ImportError:
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def clamp(color: float) -> int:
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return min(max(0, round(color)), 255)
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def blend_normal(
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# RGBA color tuple representing what's already at the dest.
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dest: Sequence[int],
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# RGBA color tuple representing the source we want to blend to the dest.
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src: Sequence[int],
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) -> Sequence[int]:
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# "Normal" blend mode, which is just alpha blending. Various games use the DX
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# equation Src * As + Dst * (1 - As). We premultiply Dst by Ad as well, since
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# we are blitting onto a destination that could have transparency. Once we are
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# done, we divide out the premultiplied Ad in order to put the pixes back to
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# their full blended values since we are not setting the destination alpha to 1.0.
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# This enables partial transparent backgrounds to work properly.
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# Short circuit for speed.
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if src[3] == 0:
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return dest
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if src[3] == 255:
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return src
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# Calculate alpha blending.
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srcpercent = src[3] / 255.0
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destpercent = dest[3] / 255.0
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srcremainder = 1.0 - srcpercent
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new_alpha = max(min(0.0, srcpercent + destpercent * srcremainder), 1.0)
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return (
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clamp(((dest[0] * destpercent * srcremainder) + (src[0] * srcpercent)) / new_alpha),
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clamp(((dest[1] * destpercent * srcremainder) + (src[1] * srcpercent)) / new_alpha),
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clamp(((dest[2] * destpercent * srcremainder) + (src[2] * srcpercent)) / new_alpha),
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clamp(255 * new_alpha)
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)
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def blend_addition(
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# RGBA color tuple representing what's already at the dest.
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dest: Sequence[int],
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# RGBA color tuple representing the source we want to blend to the dest.
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src: Sequence[int],
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) -> Sequence[int]:
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# "Addition" blend mode, which is used for fog/clouds/etc. Various games use the DX
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# equation Src * As + Dst * 1. It appears jubeat does not premultiply the source
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# by its alpha component.
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# Short circuit for speed.
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if src[3] == 0:
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return dest
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# Calculate final color blending.
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srcpercent = src[3] / 255.0
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return (
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clamp(dest[0] + (src[0] * srcpercent)),
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clamp(dest[1] + (src[1] * srcpercent)),
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clamp(dest[2] + (src[2] * srcpercent)),
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# Additive blending doesn't actually make sense on semi-transparent destinations,
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# as that implies that the semi-transparent pixel will be later displayed on top
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# of something else. That doesn't work since additive blending needs to non-linearly
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# mix with the destination. So, in reality, we should be doing what subtractive
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# blending does and keeping the destination alpha (which should always be 255),
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# but if somebody renders an animation with additive blending meant to go over a
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# background onto a transparent or semi-transparent background this will make the
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# resulting graphic look more correct.
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clamp(dest[3] + (255 * srcpercent)),
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)
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def blend_subtraction(
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# RGBA color tuple representing what's already at the dest.
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dest: Sequence[int],
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# RGBA color tuple representing the source we want to blend to the dest.
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src: Sequence[int],
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) -> Sequence[int]:
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# "Subtraction" blend mode, used for darkening an image. Various games use the DX
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# equation Dst * 1 - Src * As. It appears jubeat does not premultiply the source
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# by its alpha component much like the "additive" blend above..
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# Short circuit for speed.
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if src[3] == 0:
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return dest
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# Calculate final color blending.
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srcpercent = src[3] / 255.0
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return (
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clamp(dest[0] - (src[0] * srcpercent)),
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clamp(dest[1] - (src[1] * srcpercent)),
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clamp(dest[2] - (src[2] * srcpercent)),
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dest[3],
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)
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def blend_multiply(
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# RGBA color tuple representing what's already at the dest.
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dest: Sequence[int],
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# RGBA color tuple representing the source we want to blend to the dest.
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src: Sequence[int],
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) -> Sequence[int]:
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# "Multiply" blend mode, used for darkening an image. Various games use the DX
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# equation Src * 0 + Dst * Src. It appears jubeat uses the alternative formula
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# Src * Dst + Dst * (1 - As) which reduces to the first equation as long as the
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# source alpha is always 255.
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# Calculate final color blending.
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return (
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clamp(255 * ((dest[0] / 255.0) * (src[0] / 255.0))),
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clamp(255 * ((dest[1] / 255.0) * (src[1] / 255.0))),
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clamp(255 * ((dest[2] / 255.0) * (src[2] / 255.0))),
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dest[3],
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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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) -> 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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# Warn if we have an unsupported blend.
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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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cores = multiprocessing.cpu_count()
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if single_threaded or cores < 2:
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# Get the data in an easier to manipulate and faster to update fashion.
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imgmap = list(img.getdata())
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texmap = list(texture.getdata())
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if mask:
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alpha = mask.split()[-1]
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maskmap = alpha.tobytes('raw', 'L')
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else:
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maskmap = None
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# We don't have enough CPU cores to bother multiprocessing.
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for imgy in range(miny, maxy):
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for imgx in range(minx, maxx):
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# Determine offset
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imgoff = imgx + (imgy * imgwidth)
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# Calculate what texture pixel data goes here.
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texloc = inverse.multiply_point(Point(float(imgx + 0.5), float(imgy + 0.5)))
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texx, texy = texloc.as_tuple()
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# If we're out of bounds, don't update.
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if texx < 0 or texy < 0 or texx >= texwidth or texy >= texheight:
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continue
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# Blend it.
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texoff = texx + (texy * texwidth)
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if maskmap is not None and maskmap[imgoff] == 0:
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# This pixel is masked off!
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continue
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imgmap[imgoff] = blend_point(add_color, mult_color, texmap[texoff], imgmap[imgoff], blendfunc)
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img.putdata(imgmap)
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else:
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imgbytes = img.tobytes('raw', 'RGBA')
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texbytes = texture.tobytes('raw', 'RGBA')
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if mask:
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alpha = mask.split()[-1]
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maskbytes = alpha.tobytes('raw', 'L')
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else:
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maskbytes = None
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# Let's spread the load across multiple processors.
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procs: List[multiprocessing.Process] = []
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work: multiprocessing.Queue = multiprocessing.Queue()
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results: multiprocessing.Queue = multiprocessing.Queue()
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expected: int = 0
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interrupted: bool = False
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def ctrlc(sig: Any, frame: Any) -> None:
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nonlocal interrupted
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interrupted = True
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previous_handler = signal.getsignal(signal.SIGINT)
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signal.signal(signal.SIGINT, ctrlc)
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for _ in range(cores):
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proc = multiprocessing.Process(
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target=pixel_renderer,
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args=(
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work,
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results,
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minx,
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maxx,
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imgwidth,
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texwidth,
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texheight,
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inverse,
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add_color,
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mult_color,
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blendfunc,
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imgbytes,
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texbytes,
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maskbytes,
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),
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)
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procs.append(proc)
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proc.start()
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for imgy in range(miny, maxy):
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work.put(imgy)
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expected += 1
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lines: List[bytes] = [
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imgbytes[x:(x + (imgwidth * 4))]
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for x in range(
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0,
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imgwidth * imgheight * 4,
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imgwidth * 4,
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)
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]
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for _ in range(expected):
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imgy, result = results.get()
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lines[imgy] = result
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for proc in procs:
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work.put(None)
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for proc in procs:
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proc.join()
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signal.signal(signal.SIGINT, previous_handler)
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if interrupted:
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raise KeyboardInterrupt()
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img = Image.frombytes('RGBA', (imgwidth, imgheight), b''.join(lines))
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return img
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def blend_mask_create(
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# RGBA color tuple representing what's already at the dest.
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dest: Sequence[int],
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# RGBA color tuple representing the source we want to blend to the dest.
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src: Sequence[int],
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) -> Sequence[int]:
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# Mask creating just allows a pixel to be drawn if the source image has a nonzero
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# alpha, according to the SWF spec.
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if src[3] != 0:
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return (255, 0, 0, 255)
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else:
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return (0, 0, 0, 0)
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def blend_mask_combine(
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# RGBA color tuple representing what's already at the dest.
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dest: Sequence[int],
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# RGBA color tuple representing the source we want to blend to the dest.
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src: Sequence[int],
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) -> Sequence[int]:
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# Mask blending just takes the source and destination and ands them together, making
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# a final mask that is the intersection of the original mask and the new mask. The
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# reason we even have a color component to this is for debugging visibility.
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if dest[3] != 0 and src[3] != 0:
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return (255, 0, 0, 255)
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else:
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return (0, 0, 0, 0)
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def pixel_renderer(
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work: multiprocessing.Queue,
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results: multiprocessing.Queue,
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minx: int,
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maxx: int,
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imgwidth: int,
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texwidth: int,
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texheight: int,
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inverse: Matrix,
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add_color: Color,
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mult_color: Color,
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blendfunc: int,
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imgbytes: bytes,
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texbytes: bytes,
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maskbytes: Optional[bytes],
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) -> None:
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while True:
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imgy = work.get()
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if imgy is None:
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return
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result: List[Sequence[int]] = []
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for imgx in range(imgwidth):
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# Determine offset
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imgoff = imgx + (imgy * imgwidth)
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if imgx < minx or imgx >= maxx:
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result.append(imgbytes[(imgoff * 4):((imgoff + 1) * 4)])
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continue
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# Calculate what texture pixel data goes here.
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texloc = inverse.multiply_point(Point(float(imgx + 0.5), float(imgy + 0.5)))
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texx, texy = texloc.as_tuple()
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# If we're out of bounds, don't update.
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if texx < 0 or texy < 0 or texx >= texwidth or texy >= texheight:
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result.append(imgbytes[(imgoff * 4):((imgoff + 1) * 4)])
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continue
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# Blend it.
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texoff = texx + (texy * texwidth)
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if maskbytes is not None and maskbytes[imgoff] == 0:
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# This pixel is masked off!
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result.append(imgbytes[(imgoff * 4):((imgoff + 1) * 4)])
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continue
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result.append(blend_point(add_color, mult_color, texbytes[(texoff * 4):((texoff + 1) * 4)], imgbytes[(imgoff * 4):((imgoff + 1) * 4)], blendfunc))
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linebytes = bytes([channel for pixel in result for channel in pixel])
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results.put((imgy, linebytes))
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def blend_point(
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add_color: Color,
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mult_color: Color,
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# This should be a sequence of exactly 4 values, either bytes or a tuple.
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src_color: Sequence[int],
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# This should be a sequence of exactly 4 values, either bytes or a tuple.
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dest_color: Sequence[int],
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blendfunc: int,
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) -> Sequence[int]:
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# Calculate multiplicative and additive colors against the source.
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src_color = (
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clamp((src_color[0] * mult_color.r) + (255 * add_color.r)),
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clamp((src_color[1] * mult_color.g) + (255 * add_color.g)),
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clamp((src_color[2] * mult_color.b) + (255 * add_color.b)),
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clamp((src_color[3] * mult_color.a) + (255 * add_color.a)),
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)
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if blendfunc == 3:
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return blend_multiply(dest_color, src_color)
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# TODO: blend mode 4, which is "screen" blending according to SWF references. I've only seen this
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# in Jubeat and it implements it using OpenGL equation Src * (1 - Dst) + Dst * 1.
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# TODO: blend mode 5, which is "lighten" blending according to SWF references. Jubeat does not
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# premultiply by alpha, but the GL/DX equation is max(Src * As, Dst * 1).
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# TODO: blend mode 6, which is "darken" blending according to SWF references. Jubeat does not
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# premultiply by alpha, but the GL/DX equation is min(Src * As, Dst * 1).
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# TODO: blend mode 10, which is "invert" according to SWF references. The only game I could find
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# that implemented this had equation Src * (1 - Dst) + Dst * (1 - As).
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# TODO: blend mode 13, which is "overlay" according to SWF references. The equation seems to be
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# Src * Dst + Dst * Src but Jubeat thinks it should be Src * Dst + Dst * (1 - As).
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elif blendfunc == 8:
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return blend_addition(dest_color, src_color)
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elif blendfunc == 9 or blendfunc == 70:
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return blend_subtraction(dest_color, src_color)
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# TODO: blend mode 75, which is not in the SWF spec and appears to have the equation
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# Src * (1 - Dst) + Dst * (1 - Src).
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elif blendfunc == 256:
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# Dummy blend function for calculating masks.
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return blend_mask_combine(dest_color, src_color)
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elif blendfunc == 257:
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# Dummy blend function for calculating masks.
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return blend_mask_create(dest_color, src_color)
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else:
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return blend_normal(dest_color, src_color)
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