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Fix bug with bitmasks on a 1x1 RGBA file

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Does not change testing on other files, but fixes a case which previously made PIL collapse.
The Bitmap was a 1x1 RGBA and provoked an exception in PIL, but every Image viewer can load it.
Fixed code with comparison of header size, compression type and loading type of masks and fixed it.
This commit is contained in:
artscoop 2015-03-10 02:08:23 +01:00
parent 8c003e9b3f
commit 80d6b29b77
1 changed files with 17 additions and 10 deletions
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27
PIL/BmpImagePlugin.py
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@ -104,18 +104,19 @@ class BmpImageFile(ImageFile.ImageFile):
file_info['colors'] = i32(header_data[28:32])
file_info['palette_padding'] = 4
self.info["dpi"] = tuple(map(lambda x: math.ceil(x / 39.3701), file_info['pixels_per_meter']))
if file_info['compression'] == self.BITFIELDS:
if len(header_data) >= 52:
for idx, mask in enumerate(['r_mask', 'g_mask', 'b_mask', 'a_mask']):
file_info[mask] = i32(header_data[36+idx*4:40+idx*4])
else:
for mask in ['r_mask', 'g_mask', 'b_mask', 'a_mask']:
file_info[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'])
else:
raise IOError("Unsupported BMP header type (%d)" % file_info['header_size'])
#------------------- Special case : header is reported 40, which
#----------------------- is shorter than real size for bpp >= 16
if file_info['compression'] == self.BITFIELDS:
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.size = file_info['width'], file_info['height']
#--------- If color count was not found in the header, compute from bits
file_info['colors'] = file_info['colors'] if file_info.get('colors', 0) else (1 << file_info['bits'])
@ -128,8 +129,14 @@ class BmpImageFile(ImageFile.ImageFile):
raise IOError("Unsupported BMP pixel depth (%d)" % file_info['bits'])
#------------------ Process BMP with Bitfields compression (not palette)
if file_info['compression'] == self.BITFIELDS:
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)]}
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"}
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)]}
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"}
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'])]