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https://github.com/python-pillow/Pillow.git
synced 2025-11-04 01:47:47 +03:00
Fix .cur 32/rgba, offsets etc.
Various fixes on code broken or not passing tests
This commit is contained in:
artscoop
parent
d7a78f3813
commit
9e3af5a161
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@ -81,18 +81,15 @@ class BmpImageFile(ImageFile.ImageFile):
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self._bitmap(offset=offset)
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def _bitmap(self, header=0, offset=0):
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print offset, header
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""" Read relevant info about the BMP """
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read, seek = self.fp.read, self.fp.seek
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seek(2)
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start_data = read(12)
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if header:
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seek(header)
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file_info = dict()
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file_info['filesize'] = i32(start_data[0:4]) # file size @offset 2 (offsets 4, 12 are reserved for OS/2 Icons)
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file_info['image_offset'] = i32(start_data[8:12]) # file size @offset 2 (offsets 4, 12 are reserved for OS/2 Icons)
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file_info['header_size'] = i32(read(4)) # read bmp header size @offset 14 (this is part of the header size)
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file_info['direction'] = -1
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#---------------------- If requested, read header at a specific position
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if header:
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seek(header)
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header_data = ImageFile._safe_read(self.fp, file_info['header_size'] - 4) # read the rest of the bmp header, without its size
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#---------------------------------------------------- IBM OS/2 Bitmap v1
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#------- This format has different offsets because of width/height types
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@ -105,13 +102,6 @@ class BmpImageFile(ImageFile.ImageFile):
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file_info['palette_padding'] = 3
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#----------------------------------------------- Windows Bitmap v2 to v5
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elif file_info['header_size'] in (40, 64, 108, 124): # v3, OS/2 v2, v4, v5
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if file_info['header_size'] >= 64:
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file_info['r_mask'] = i32(header_data[36:40])
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file_info['g_mask'] = i32(header_data[40:44])
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file_info['b_mask'] = i32(header_data[44:48])
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file_info['a_mask'] = i32(header_data[48:52])
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file_info['rgb_mask'] = (file_info['r_mask'], file_info['g_mask'], file_info['b_mask'])
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file_info['rgba_mask'] = (file_info['r_mask'], file_info['g_mask'], file_info['b_mask'], file_info['a_mask'])
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if file_info['header_size'] >= 40: # v3 and OS/2
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file_info['y_flip'] = i8(header_data[7]) == 0xff
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file_info['direction'] = 1 if file_info['y_flip'] else -1
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@ -124,9 +114,12 @@ class BmpImageFile(ImageFile.ImageFile):
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file_info['pixels_per_meter'] = (i32(header_data[20:24]), i32(header_data[24:28]))
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file_info['colors'] = i32(header_data[28:32])
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file_info['palette_padding'] = 4
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self.info["dpi"] = tuple(map(lambda x: math.ceil(x / 39.3701), file_info['pixels_per_meter']))
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else:
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raise IOError("Unsupported BMP header type (%d)" % file_info['header_size'])
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#------------------- Special case : header is reported 40, which
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#----------------------- is shorter than real size for bpp >= 16
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if file_info['header_size'] < 64 and file_info['bits'] >= 16:
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if file_info['compression'] == self.BITFIELDS:
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file_info['r_mask'] = i32(read(4))
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file_info['g_mask'] = i32(read(4))
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file_info['b_mask'] = i32(read(4))
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@ -134,16 +127,12 @@ class BmpImageFile(ImageFile.ImageFile):
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file_info['rgb_mask'] = (file_info['r_mask'], file_info['g_mask'], file_info['b_mask'])
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file_info['rgba_mask'] = (file_info['r_mask'], file_info['g_mask'], file_info['b_mask'], file_info['a_mask'])
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self.info["dpi"] = tuple(map(lambda x: math.ceil(x / 39.3701), file_info['pixels_per_meter']))
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else:
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raise IOError("Unsupported BMP header type (%d)" % file_info['header_size'])
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self.size = file_info['width'], file_info['height']
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#--------- If color count was not found in the header, compute from bits
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file_info['colors'] = file_info['colors'] if file_info.get('colors', 0) else (1 << file_info['bits'])
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#--------------------------------- Check abnormal values for DOS attacks
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if file_info['width'] * file_info['height'] > 2**31:
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raise IOError("Unsupported BMP Size: (%dx%d)" % self.size)
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#------------------------ Check bit depth for unusual unsupported values
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self.mode, raw_mode = BIT2MODE.get(file_info['bits'], (None, None))
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if self.mode is None:
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@ -151,8 +140,8 @@ class BmpImageFile(ImageFile.ImageFile):
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#------------------ Process BMP with Bitfields compression (not palette)
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if file_info['compression'] == self.BITFIELDS:
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SUPPORTED = {32: [(0xff0000, 0xff00, 0xff, 0x0), (0xff0000, 0xff00, 0xff, 0xff000000)], 24: [(0xff0000, 0xff00, 0xff)], 16: [(0xf800, 0x7e0, 0x1f), (0x7c00, 0x3e0, 0x1f)]}
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MASK_MODES = {(32, (0xff0000, 0xff00, 0xff, 0x0)): "BGRX", (32, (0xff0000, 0xff00, 0xff, 0xff000000)): "BGRA", (24, (0xff0000, 0xff00, 0xff)): "BGR", (16, (0xf800, 0x7e0, 0x1f)): "BGR;16", (16, (0x7c00, 0x3e0, 0x1f)): "BGR;15"}
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SUPPORTED = {32: [(0xff0000, 0xff00, 0xff, 0x0), (0xff0000, 0xff00, 0xff, 0xff000000), (0x0, 0x0, 0x0, 0x0)], 24: [(0xff0000, 0xff00, 0xff)], 16: [(0xf800, 0x7e0, 0x1f), (0x7c00, 0x3e0, 0x1f)]}
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MASK_MODES = {(32, (0xff0000, 0xff00, 0xff, 0x0)): "BGRX", (32, (0xff0000, 0xff00, 0xff, 0xff000000)): "BGRA", (32, (0x0, 0x0, 0x0, 0x0)): "BGRA", (24, (0xff0000, 0xff00, 0xff)): "BGR", (16, (0xf800, 0x7e0, 0x1f)): "BGR;16", (16, (0x7c00, 0x3e0, 0x1f)): "BGR;15"}
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if file_info['bits'] in SUPPORTED:
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if file_info['bits'] == 32 and file_info['rgba_mask'] in SUPPORTED[file_info['bits']]:
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raw_mode = MASK_MODES[(file_info['bits'], file_info['rgba_mask'])]
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@ -163,9 +152,11 @@ class BmpImageFile(ImageFile.ImageFile):
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raise IOError("Unsupported BMP bitfields layout")
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else:
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raise IOError("Unsupported BMP bitfields layout")
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elif file_info['compression'] != self.RAW:
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raise IOError("Unsupported BMP compression (%d)" % compression)
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elif file_info['compression'] == self.RAW:
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if file_info['bits'] == 32 and header == 22: # 32-bit .cur offset
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raw_mode, self.mode = "BGRA", "RGBA"
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else:
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raise IOError("Unsupported BMP compression (%d)" % file_info['compression'])
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#----------------- Once the header is processed, process the palette/LUT
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if self.mode == "P": # Paletted for 1, 4 and 8 bit images
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#------------------------------------------------------ 1-bit images
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@ -189,9 +180,10 @@ class BmpImageFile(ImageFile.ImageFile):
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self.mode = "P"
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self.palette = ImagePalette.raw("BGRX" if padding == 4 else "BGR", b"".join(palette))
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print file_info, self.mode, raw_mode, self.fp.tell()
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#------------------------------ Finally set the tile data for the plugin
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self.info['compression'] = file_info['compression']
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self.tile = [('raw', (0, 0, file_info['width'], file_info['height']), file_info['image_offset'],
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self.tile = [('raw', (0, 0, file_info['width'], file_info['height']), offset or self.fp.tell(),
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(raw_mode, ((file_info['width'] * file_info['bits'] + 31) >> 3) & (~3), file_info['direction'])
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)]
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