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Fix for all good_tests

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Fixed loading of all types of provided images (+rgba). Added edge case where the header is reported as 40 bytes long with BITFIELDS (they start past the 40 bytes of the header). Loading fails for RLE, but IIRC, they're unsupported so it's normal.
This commit is contained in:
artscoop 2015-03-04 22:05:32 +01:00
parent c8551770eb
commit 7b657f6887
1 changed files with 24 additions and 12 deletions
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36
PIL/BmpImagePlugin.py
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@ -16,7 +16,6 @@
# 2002-12-30 fl Fixed load of 1-bit palette images
# 2003-04-21 fl Fixed load of 1-bit monochrome images
# 2003-04-23 fl Added limited support for BI_BITFIELDS compression
# 2015-03-04 sk Added support for 32-bit images + alpha channel
#
# Copyright (c) 1997-2003 by Secret Labs AB
# Copyright (c) 1995-2003 by Fredrik Lundh
@ -92,7 +91,6 @@ class BmpImageFile(ImageFile.ImageFile):
file_info['header_size'] = i32(read(4)) # read bmp header size @offset 14 (this is part of the header size)
file_info['direction'] = -1
header_data = ImageFile._safe_read(self.fp, file_info['header_size'] - 4) # read the rest of the bmp header, without its size
#---------------------------------------------------- IBM OS/2 Bitmap v1
#------- This format has different offsets because of width/height types
if file_info['header_size'] == 12:
@ -103,7 +101,7 @@ class BmpImageFile(ImageFile.ImageFile):
file_info['compression'] = self.RAW
file_info['palette_padding'] = 3
#----------------------------------------------- Windows Bitmap v2 to v5
elif file_info['header_size'] in (40, 64, 108, 124): # v3, OS/2 v2, v4, v5
elif file_info['header_size'] in {40, 64, 108, 124}: # v3, OS/2 v2, v4, v5
if file_info['header_size'] >= 64:
file_info['r_mask'] = i32(header_data[36:40])
file_info['g_mask'] = i32(header_data[40:44])
@ -113,7 +111,7 @@ class BmpImageFile(ImageFile.ImageFile):
file_info['rgba_mask'] = (file_info['r_mask'], file_info['g_mask'], file_info['b_mask'], file_info['a_mask'])
if file_info['header_size'] >= 40: # v3 and OS/2
file_info['y_flip'] = i8(header_data[7]) == 0xff
file_info['direction'] = 0 if file_info['y_flip'] else -1
file_info['direction'] = 1 if file_info['y_flip'] else -1
file_info['width'] = i32(header_data[0:4])
file_info['height'] = i32(header_data[4:8]) if not file_info['y_flip'] else 2**32 - i32(header_data[4:8])
file_info['planes'] = i16(header_data[8:10])
@ -123,6 +121,16 @@ class BmpImageFile(ImageFile.ImageFile):
file_info['pixels_per_meter'] = (i32(header_data[20:24]), i32(header_data[24:28]))
file_info['colors'] = i32(header_data[28:32])
file_info['palette_padding'] = 4
#------------------- Special case : header is reported 40, which
#----------------------- is shorter than real size for bpp >= 16
if file_info['header_size'] < 64 and file_info['bits'] >= 16:
file_info['r_mask'] = i32(read(4))
file_info['g_mask'] = i32(read(4))
file_info['b_mask'] = i32(read(4))
file_info['a_mask'] = i32(read(4))
file_info['rgb_mask'] = (file_info['r_mask'], file_info['g_mask'], file_info['b_mask'])
file_info['rgba_mask'] = (file_info['r_mask'], file_info['g_mask'], file_info['b_mask'], file_info['a_mask'])
self.info["dpi"] = tuple(map(lambda x: math.ceil(x / 39.3701), file_info['pixels_per_meter']))
else:
raise IOError("BMP images with a {0} byte header are not supported".format(file_info['header_size']))
@ -140,12 +148,16 @@ class BmpImageFile(ImageFile.ImageFile):
#------------------ Process BMP with Bitfields compression (not palette)
if file_info['compression'] == self.BITFIELDS:
SUPPORTED = {32: [(0xff0000, 0xff00, 0xff, 0x0), (0xff0000, 0xff00, 0xff, 0xff000000)], 24: [(0xff0000, 0xff00, 0xff, 0x0)], 16: [(0xf800, 0x7e0, 0x1f, 0x0), (0x7c00, 0x3e0, 0x1f, 0x0)]}
SUPPORTED = {32: [(0xff0000, 0xff00, 0xff, 0x0), (0xff0000, 0xff00, 0xff, 0xff000000)], 24: [(0xff0000, 0xff00, 0xff)], 16: [(0xf800, 0x7e0, 0x1f), (0x7c00, 0x3e0, 0x1f)]}
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"}
if file_info['bits'] in SUPPORTED and file_info['rgba_mask'] in SUPPORTED[file_info['bits']]:
raw_mode = MASK_MODES[(file_info['bits'], file_info['rgba_mask'])]
if raw_mode in {"BGRA"}:
self.mode = "RGBA"
if file_info['bits'] in SUPPORTED:
if file_info['bits'] == 32 and file_info['rgba_mask'] in SUPPORTED[file_info['bits']]:
raw_mode = MASK_MODES[(file_info['bits'], file_info['rgba_mask'])]
self.mode = "RGBA" if raw_mode in ("BGRA",) else self.mode
elif file_info['bits'] in (24, 16) and file_info['rgb_mask'] in SUPPORTED[file_info['bits']]:
raw_mode = MASK_MODES[(file_info['bits'], file_info['rgb_mask'])]
else:
raise IOError("BMP images with the provided bitfield mask are not supported")
else:
raise IOError("BMP images with the provided bitfield information are not supported")
elif file_info['compression'] != self.RAW:
@ -160,14 +172,14 @@ class BmpImageFile(ImageFile.ImageFile):
padding = file_info['palette_padding']
palette = read(padding * file_info['colors'])
#------------------- Check if greyscale and ignore palette if so
greyscale = all([palette[ind] == palette[ind+1] == palette[ind+2] for ind in range(len(palette), padding)])
greyscale = all([palette[ind] == palette[ind+1] == palette[ind+2] == ind / padding for ind in range(0, len(palette), padding)])
#--------- If all colors are grey, white or black, ditch palette
if greyscale:
self.mode = "1" if file_info['colors'] == 2 else "L"
raw_mode = self.mode if self.mode != "1" else "1;I" # rule for 1bpp : 1=b, 0=w
raw_mode = self.mode
else:
self.mode = "P"
self.palette = ImagePalette.raw("BGRX", b"".join(palette))
self.palette = ImagePalette.raw("BGRX" if padding == 4 else "BGR", b"".join(palette))
#------------------------------ Finally set the tile data for the plugin
self.info['compression'] = file_info['compression']