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Fix image layer rotation for pages with nonzero crop boxes

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This commit is contained in:
James R. Barlow
2016-02-10 17:48:33 -08:00
parent 4ec51729d8
commit 7c691c21ab
1 changed files with 19 additions and 19 deletions
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ocrmypdf/main.py
+19 -19
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@@ -777,8 +777,11 @@ def add_text_layer(
page_text = pdf_text.getPage(0)
# The text page will be oriented up
# if lossless_reconstruction, pdf_image may have a rotation applied
# The text page always will be oriented up
# but if lossless_reconstruction, pdf_image may have a rotation applied
# we can't just merge the pages, because a page can only have one /Rotate
# tag, so the differential rotation must be corrected.
# Also, pdf_image may not have its mediabox nailed to (0, 0)
page_image = pdf_image.getPage(0)
rotation = page_image.get('/Rotate', 0)
@@ -786,34 +789,31 @@ def add_text_layer(
# The negative of this value is the angle that eliminates that rotation
rotation = -rotation % 360
w, h = page_image.mediaBox.getWidth(), page_image.mediaBox.getHeight()
x1 = page_image.mediaBox.getLowerLeft_x()
x2 = page_image.mediaBox.getUpperRight_x()
y1 = page_image.mediaBox.getLowerLeft_y()
y2 = page_image.mediaBox.getUpperRight_y()
# Rotation occurs about the bottom left corner of the image rather than
# the center.
# Rotation is applied first, then the image must be translated so that the
# bottom left corner of the image is moved to the bottom left corner of the
# page.
# Rotation occurs about the page's (0, 0). Most pages will have the media
# box at (0, 0) will all content in the first quadrant but some cropped
# files may have an offset mediabox. We translate the page so that its
# bottom left corner after rotation is pinned to (0, 0) with the image
# in the first quadrant.
if rotation == 0:
tx, ty = 0, 0
tx, ty = -x1, -y1
elif rotation == 90:
tx, ty = h, 0
tx, ty = y2, -x1
elif rotation == 180:
tx, ty = w, h
tx, ty = x2, y2
elif rotation == 270:
tx, ty = 0, w
tx, ty = -y1, x2
else:
pass
if rotation != 0:
log.info("{0:4d}: rotating image within page {1} degrees".format(
log.info("{0:4d}: rotating image layer {1} degrees".format(
page_number(image), rotation, tx, ty))
# Since we produced .hocr.pdf it will have a mediabox at (0, 0)
# No such guarantees about .image-layer.pdf, so compensate
if rotation == 0:
lower_left = page_image.mediaBox.lowerLeft
tx, ty = (tx - lower_left[0], ty - lower_left[1])
page_text.mergeRotatedScaledTranslatedPage(
page_image, rotation, 1.0, tx, ty, expand=False)