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https://github.com/python-pillow/Pillow.git
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119 lines
3.8 KiB
Python
119 lines
3.8 KiB
Python
from __future__ import annotations
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from io import BytesIO
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from pathlib import Path
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from PIL import Image, ImageWin
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from .helper import hopper, is_win32
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# see https://github.com/python-pillow/Pillow/pull/1431#issuecomment-144692652
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if is_win32():
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import ctypes
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import ctypes.wintypes
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class BITMAPFILEHEADER(ctypes.Structure):
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_pack_ = 2
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_fields_ = [
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("bfType", ctypes.wintypes.WORD),
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("bfSize", ctypes.wintypes.DWORD),
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("bfReserved1", ctypes.wintypes.WORD),
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("bfReserved2", ctypes.wintypes.WORD),
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("bfOffBits", ctypes.wintypes.DWORD),
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]
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class BITMAPINFOHEADER(ctypes.Structure):
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_pack_ = 2
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_fields_ = [
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("biSize", ctypes.wintypes.DWORD),
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("biWidth", ctypes.wintypes.LONG),
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("biHeight", ctypes.wintypes.LONG),
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("biPlanes", ctypes.wintypes.WORD),
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("biBitCount", ctypes.wintypes.WORD),
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("biCompression", ctypes.wintypes.DWORD),
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("biSizeImage", ctypes.wintypes.DWORD),
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("biXPelsPerMeter", ctypes.wintypes.LONG),
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("biYPelsPerMeter", ctypes.wintypes.LONG),
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("biClrUsed", ctypes.wintypes.DWORD),
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("biClrImportant", ctypes.wintypes.DWORD),
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]
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BI_RGB = 0
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DIB_RGB_COLORS = 0
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memcpy = ctypes.cdll.msvcrt.memcpy
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memcpy.argtypes = [ctypes.c_void_p, ctypes.c_void_p, ctypes.c_size_t]
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windll = getattr(ctypes, "windll")
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CreateCompatibleDC = windll.gdi32.CreateCompatibleDC
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CreateCompatibleDC.argtypes = [ctypes.wintypes.HDC]
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CreateCompatibleDC.restype = ctypes.wintypes.HDC
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DeleteDC = windll.gdi32.DeleteDC
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DeleteDC.argtypes = [ctypes.wintypes.HDC]
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SelectObject = windll.gdi32.SelectObject
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SelectObject.argtypes = [ctypes.wintypes.HDC, ctypes.wintypes.HGDIOBJ]
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SelectObject.restype = ctypes.wintypes.HGDIOBJ
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DeleteObject = windll.gdi32.DeleteObject
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DeleteObject.argtypes = [ctypes.wintypes.HGDIOBJ]
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CreateDIBSection = windll.gdi32.CreateDIBSection
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CreateDIBSection.argtypes = [
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ctypes.wintypes.HDC,
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ctypes.c_void_p,
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ctypes.c_uint,
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ctypes.POINTER(ctypes.c_void_p),
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ctypes.wintypes.HANDLE,
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ctypes.wintypes.DWORD,
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]
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CreateDIBSection.restype = ctypes.wintypes.HBITMAP
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def serialize_dib(bi: BITMAPINFOHEADER, pixels: ctypes.c_void_p) -> bytearray:
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bf = BITMAPFILEHEADER()
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bf.bfType = 0x4D42
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bf.bfOffBits = ctypes.sizeof(bf) + bi.biSize
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bf.bfSize = bf.bfOffBits + bi.biSizeImage
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bf.bfReserved1 = bf.bfReserved2 = 0
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buf = (ctypes.c_byte * bf.bfSize)()
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bp = ctypes.addressof(buf)
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memcpy(bp, ctypes.byref(bf), ctypes.sizeof(bf))
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memcpy(bp + ctypes.sizeof(bf), ctypes.byref(bi), bi.biSize)
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memcpy(bp + bf.bfOffBits, pixels, bi.biSizeImage)
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return bytearray(buf)
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def test_pointer(tmp_path: Path) -> None:
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im = hopper()
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(width, height) = im.size
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opath = str(tmp_path / "temp.png")
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imdib = ImageWin.Dib(im)
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hdr = BITMAPINFOHEADER()
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hdr.biSize = ctypes.sizeof(hdr)
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hdr.biWidth = width
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hdr.biHeight = height
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hdr.biPlanes = 1
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hdr.biBitCount = 32
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hdr.biCompression = BI_RGB
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hdr.biSizeImage = width * height * 4
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hdr.biClrUsed = 0
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hdr.biClrImportant = 0
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hdc = CreateCompatibleDC(None)
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pixels = ctypes.c_void_p()
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dib = CreateDIBSection(
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hdc, ctypes.byref(hdr), DIB_RGB_COLORS, ctypes.byref(pixels), None, 0
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)
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SelectObject(hdc, dib)
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imdib.expose(hdc)
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bitmap = serialize_dib(hdr, pixels)
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DeleteObject(dib)
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DeleteDC(hdc)
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with Image.open(BytesIO(bitmap)) as im:
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im.save(opath)
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