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112 lines
3.8 KiB
Python
112 lines
3.8 KiB
Python
from helper import unittest, PillowTestCase, hopper
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from PIL import Image, ImageWin
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import sys
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import ctypes
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from io import BytesIO
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# see https://github.com/python-pillow/Pillow/pull/1431#issuecomment-144692652
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if sys.platform.startswith('win32'):
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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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CreateCompatibleDC = ctypes.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 = ctypes.windll.gdi32.DeleteDC
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DeleteDC.argtypes = [ ctypes.wintypes.HDC ]
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SelectObject = ctypes.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 = ctypes.windll.gdi32.DeleteObject
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DeleteObject.argtypes = [ ctypes.wintypes.HGDIOBJ ]
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CreateDIBSection = ctypes.windll.gdi32.CreateDIBSection
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CreateDIBSection.argtypes = [ ctypes.wintypes.HDC, ctypes.c_void_p, ctypes.c_uint, ctypes.POINTER(ctypes.c_void_p), ctypes.wintypes.HANDLE, ctypes.wintypes.DWORD ]
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CreateDIBSection.restype = ctypes.wintypes.HBITMAP
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def serialize_dib(bi, pixels):
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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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class TestImageWinPointers(PillowTestCase):
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def test_pointer(self):
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im = hopper()
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(width, height) =im.size
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opath = self.tempfile('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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#print('hdc:',hex(hdc))
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pixels = ctypes.c_void_p()
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dib = CreateDIBSection(hdc, ctypes.byref(hdr), DIB_RGB_COLORS, ctypes.byref(pixels), None, 0)
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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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reloaded = Image.open(BytesIO(bitmap)).save(opath)
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if __name__ == '__main__':
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unittest.main()
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