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Fix rotation for unsplit (modulo --rotate-pages)

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This commit is contained in:
James R. Barlow
2018-04-30 20:58:42 -07:00
parent 6409894a71
commit 0806ce6406
1 changed files with 19 additions and 20 deletions
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39
src/ocrmypdf/pipeline.py
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@@ -744,41 +744,40 @@ def _weave_layers_graft(pdf_base, page_num, text, font, log):
base_page = pdf_base.pages.p(page_num)
rotation = int(base_page.get('/Rotate', 0))
rotation = -rotation % 360
rotation = rotation % 360
# The text page always will be oriented up by this stage but the original
# content may have a rotation applied (in a /Rotate tag) and we might have
# separated determined that we are going to adjust to some other rotation.
# The Tm text matrix operator does *not* concatenate so we can't rotate
# the text layer. Instead we have to rotate the original content so it is
# aligned with the text layer.
# content may have a rotation applied. Wrap the text stream with a rotation
# so it will be oriented the same way as the rest of the page content.
# (Previous versions OCRmyPDF rotated the content layer to match the text.)
if rotation != 0:
mediabox = [float(base_page.MediaBox[v].decode())
for v in range(4)]
w, h = mediabox[2] - mediabox[0], mediabox[3] - mediabox[1]
translate = pikepdf.PdfMatrix((1, 0, 0, 1, -w / 2, -h / 2))
mediabox = [float(pdf_text.pages[0].MediaBox[v].decode())
for v in range(4)]
w, h = mediabox[2] - mediabox[0], mediabox[3] - mediabox[1]
untranslate = pikepdf.PdfMatrix((1, 0, 0, 1, w / 2, h / 2))
wt, ht = mediabox[2] - mediabox[0], mediabox[3] - mediabox[1]
translate = pikepdf.PdfMatrix((1, 0, 0, 1, -wt / 2, -ht / 2))
mediabox = [float(base_page.MediaBox[v].decode())
for v in range(4)]
wp, hp = mediabox[2] - mediabox[0], mediabox[3] - mediabox[1]
untranslate = pikepdf.PdfMatrix((1, 0, 0, 1, wp / 2, hp / 2))
c, s = cos(rotation * pi / 180), sin(rotation * pi / 180)
rotate = pikepdf.PdfMatrix((c, s, -s, c, 0, 0))
# Translate the text so it is centered at (0, 0), rotate it there, and
# translate it to the center of the target page
ctm = translate @ rotate @ untranslate
pdf_text_contents += b'\nq %s cm\n' % ctm.encode()
pdf_text_contents = (
b'q %s cm\n' % ctm.encode() +
pdf_text_contents +
b'\nQ\n'
)
new_text_layer = pikepdf.Stream(pdf_base, pdf_text_contents)
base_page.page_contents_add(new_text_layer, prepend=True)
closing_statement = pikepdf.Stream(pdf_base, b'\nQ\n')
base_page.page_contents_add(closing_statement, prepend=False)
base_page.page_contents_coalesce()
# Update page fonts with reference to Glyphless
try:
base_fonts = base_page['/Resources']['/Font']