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Added DIB saving and loading through Image open

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This commit is contained in:
Andrew Murray 2019-03-06 13:59:07 +11:00
parent 975fccafc7
commit 1bdb5dc917
2 changed files with 38 additions and 7 deletions
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17
Tests/test_file_bmp.py
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@ -16,6 +16,7 @@ class TestFileBmp(PillowTestCase):
self.assertEqual(im.mode, reloaded.mode) self.assertEqual(im.mode, reloaded.mode)
self.assertEqual(im.size, reloaded.size) self.assertEqual(im.size, reloaded.size)
self.assertEqual(reloaded.format, "BMP") self.assertEqual(reloaded.format, "BMP")
self.assertEqual(reloaded.get_format_mimetype(), "image/bmp")
def test_sanity(self): def test_sanity(self):
self.roundtrip(hopper()) self.roundtrip(hopper())
@ -72,6 +73,20 @@ class TestFileBmp(PillowTestCase):
def test_load_dib(self): def test_load_dib(self):
# test for #1293, Imagegrab returning Unsupported Bitfields Format # test for #1293, Imagegrab returning Unsupported Bitfields Format
im = BmpImagePlugin.DibImageFile('Tests/images/clipboard.dib') im = Image.open('Tests/images/clipboard.dib')
self.assertEqual(im.format, "DIB")
self.assertEqual(im.get_format_mimetype(), "image/bmp")
target = Image.open('Tests/images/clipboard_target.png') target = Image.open('Tests/images/clipboard_target.png')
self.assert_image_equal(im, target) self.assert_image_equal(im, target)
def test_save_dib(self):
outfile = self.tempfile("temp.dib")
im = Image.open('Tests/images/clipboard.dib')
im.save(outfile)
reloaded = Image.open(outfile)
self.assertEqual(reloaded.format, "DIB")
self.assertEqual(reloaded.get_format_mimetype(), "image/bmp")
self.assert_image_equal(im, reloaded)

28
src/PIL/BmpImagePlugin.py
View File

@ -52,6 +52,10 @@ def _accept(prefix):
return prefix[:2] == b"BM" return prefix[:2] == b"BM"
def _dib_accept(prefix):
return i32(prefix[:4]) in [12, 40, 64, 108, 124]
# ============================================================================= # =============================================================================
# Image plugin for the Windows BMP format. # Image plugin for the Windows BMP format.
# ============================================================================= # =============================================================================
@ -291,7 +295,11 @@ SAVE = {
} }
def _save(im, fp, filename): def _dib_save(im, fp, filename):
_save(im, fp, filename, False)
def _save(im, fp, filename, bitmap_header=True):
try: try:
rawmode, bits, colors = SAVE[im.mode] rawmode, bits, colors = SAVE[im.mode]
except KeyError: except KeyError:
@ -306,14 +314,15 @@ def _save(im, fp, filename):
stride = ((im.size[0]*bits+7)//8+3) & (~3) stride = ((im.size[0]*bits+7)//8+3) & (~3)
header = 40 # or 64 for OS/2 version 2 header = 40 # or 64 for OS/2 version 2
offset = 14 + header + colors * 4
image = stride * im.size[1] image = stride * im.size[1]
# bitmap header # bitmap header
fp.write(b"BM" + # file type (magic) if bitmap_header:
o32(offset+image) + # file size offset = 14 + header + colors * 4
o32(0) + # reserved fp.write(b"BM" + # file type (magic)
o32(offset)) # image data offset o32(offset+image) + # file size
o32(0) + # reserved
o32(offset)) # image data offset
# bitmap info header # bitmap info header
fp.write(o32(header) + # info header size fp.write(o32(header) + # info header size
@ -352,3 +361,10 @@ Image.register_save(BmpImageFile.format, _save)
Image.register_extension(BmpImageFile.format, ".bmp") Image.register_extension(BmpImageFile.format, ".bmp")
Image.register_mime(BmpImageFile.format, "image/bmp") Image.register_mime(BmpImageFile.format, "image/bmp")
Image.register_open(DibImageFile.format, DibImageFile, _dib_accept)
Image.register_save(DibImageFile.format, _dib_save)
Image.register_extension(DibImageFile.format, ".dib")
Image.register_mime(DibImageFile.format, "image/bmp")