Test for PR#1431, following [nu744]

2025-11-04 01:47:47 +03:00 · 2015-10-01 06:06:21 -07:00 · 2015-10-01 06:06:21 -07:00 · 3228860514
commit 3228860514
parent 2be12dec2b
1 changed files with 113 additions and 0 deletions
--- a/Tests/test_imagewin_pointers.py
+++ b/Tests/test_imagewin_pointers.py
@ -0,0 +1,113 @@
+from helper import unittest, PillowTestCase, hopper
+
+from PIL import Image, ImageWin
+import sys
+import ctypes
+import ctypes.wintypes
+from io import BytesIO
+
+# see https://github.com/python-pillow/Pillow/pull/1431#issuecomment-144692652
+
+if not sys.platform.startswith('win32'):
+	unittest.skip("Win32 only test")
+
+class BITMAPFILEHEADER(ctypes.Structure):
+    _pack_ = 2
+    _fields_ = [
+        ('bfType', ctypes.wintypes.WORD),
+        ('bfSize', ctypes.wintypes.DWORD),
+        ('bfReserved1', ctypes.wintypes.WORD),
+        ('bfReserved2', ctypes.wintypes.WORD),
+        ('bfOffBits', ctypes.wintypes.DWORD),
+    ]
+
+class BITMAPINFOHEADER(ctypes.Structure):
+    _pack_ = 2
+    _fields_ = [
+        ('biSize', ctypes.wintypes.DWORD),
+        ('biWidth', ctypes.wintypes.LONG),
+        ('biHeight', ctypes.wintypes.LONG),
+        ('biPlanes', ctypes.wintypes.WORD),
+        ('biBitCount', ctypes.wintypes.WORD),
+        ('biCompression', ctypes.wintypes.DWORD),
+        ('biSizeImage', ctypes.wintypes.DWORD),
+        ('biXPelsPerMeter', ctypes.wintypes.LONG),
+        ('biYPelsPerMeter', ctypes.wintypes.LONG),
+        ('biClrUsed', ctypes.wintypes.DWORD),
+        ('biClrImportant', ctypes.wintypes.DWORD),
+    ]
+
+BI_RGB = 0
+DIB_RGB_COLORS = 0
+
+memcpy = ctypes.cdll.msvcrt.memcpy
+memcpy.argtypes = [ ctypes.c_void_p, ctypes.c_void_p, ctypes.c_size_t ]
+
+CreateCompatibleDC = ctypes.windll.gdi32.CreateCompatibleDC
+CreateCompatibleDC.argtypes = [ ctypes.wintypes.HDC ]
+CreateCompatibleDC.restype = ctypes.wintypes.HDC
+
+DeleteDC = ctypes.windll.gdi32.DeleteDC
+DeleteDC.argtypes = [ ctypes.wintypes.HDC ]
+
+SelectObject = ctypes.windll.gdi32.SelectObject
+SelectObject.argtypes = [ ctypes.wintypes.HDC, ctypes.wintypes.HGDIOBJ ]
+SelectObject.restype = ctypes.wintypes.HGDIOBJ
+
+DeleteObject = ctypes.windll.gdi32.DeleteObject
+DeleteObject.argtypes = [ ctypes.wintypes.HGDIOBJ ]
+
+CreateDIBSection = ctypes.windll.gdi32.CreateDIBSection
+CreateDIBSection.argtypes = [ ctypes.wintypes.HDC, ctypes.c_void_p, ctypes.c_uint, ctypes.POINTER(ctypes.c_void_p), ctypes.wintypes.HANDLE, ctypes.wintypes.DWORD ]
+CreateDIBSection.restype = ctypes.wintypes.HBITMAP
+
+
+def serialize_dib(bi, pixels):
+    bf = BITMAPFILEHEADER()
+    bf.bfType = 0x4d42
+    bf.bfOffBits = ctypes.sizeof(bf) + bi.biSize
+    bf.bfSize = bf.bfOffBits + bi.biSizeImage
+    bf.bfReserved1 = bf.bfReserved2 = 0
+
+    buf = (ctypes.c_byte * bf.bfSize)()
+    bp = ctypes.addressof(buf)
+    memcpy(bp, ctypes.byref(bf), ctypes.sizeof(bf))
+    memcpy(bp + ctypes.sizeof(bf), ctypes.byref(bi), bi.biSize)
+    memcpy(bp + bf.bfOffBits, pixels, bi.biSizeImage)
+    return bytes(buf)
+
+class TestImageWinPointers(PillowTestCase):
+	def test_pointer(self):
+		im = hopper()
+		(width, height) =im.size
+		opath = self.tempfile('temp.png')
+		imdib = ImageWin.Dib(im)
+
+		hdr = BITMAPINFOHEADER()
+		hdr.biSize = ctypes.sizeof(hdr)
+		hdr.biWidth = width
+		hdr.biHeight = height
+		hdr.biPlanes = 1
+		hdr.biBitCount = 32
+		hdr.biCompression = BI_RGB
+		hdr.biSizeImage = width * height * 4
+		hdr.biClrUsed = 0
+		hdr.biClrImportant = 0
+
+		hdc = CreateCompatibleDC(None)
+		print('hdc:',hex(hdc))
+		pixels = ctypes.c_void_p()
+		dib = CreateDIBSection(hdc, ctypes.byref(hdr), DIB_RGB_COLORS, ctypes.byref(pixels), None, 0)
+		SelectObject(hdc, dib)
+
+		imdib.expose(hdc)
+		bitmap = serialize_dib(hdr, pixels)
+		DeleteObject(dib)
+		DeleteDC(hdc)
+
+		reloaded = Image.open(BytesIO(bitmap)).save(opath)
+
+if __name__ == '__main__':
+    unittest.main()
+
+# End of file