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pipeline: describe page/canvas DPI

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This commit is contained in:
James R. Barlow
2023-06-11 13:40:14 -07:00
parent dbe6148d41
commit ae2f8ed8f1
1 changed files with 13 additions and 3 deletions
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src/ocrmypdf/_pipeline.py
+13 -3
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@@ -227,7 +227,10 @@ def get_page_dpi(pageinfo: PageInfo, options) -> Resolution:
def get_page_square_dpi(pageinfo: PageInfo, options) -> Resolution:
"""Get the DPI when we require xres == yres, scaled to physical units."""
"""Get the DPI when we require xres == yres, scaled to physical units.
Page DPI includes UserUnit scaling.
"""
xres = pageinfo.dpi.x or 0.0
yres = pageinfo.dpi.y or 0.0
userunit = float(pageinfo.userunit) or 1.0
@@ -243,7 +246,12 @@ def get_page_square_dpi(pageinfo: PageInfo, options) -> Resolution:
def get_canvas_square_dpi(pageinfo: PageInfo, options) -> Resolution:
"""Get the DPI when we require xres == yres, in Postscript units."""
"""Get the DPI when we require xres == yres, in Postscript units.
Canvas DPI is independent of PDF UserUnit scaling, which is
used to describe situations where the PDF user space is not 1:1 with
the physical units of the page.
"""
units = float(
max(
(pageinfo.dpi.x) or VECTOR_PAGE_DPI,
@@ -825,7 +833,9 @@ def metadata_fixup(working_file: Path, context: PdfContext) -> Path:
return output_file
def _file_size_ratio(input_file: Path, output_file: Path) -> tuple[float | None, float | None]:
def _file_size_ratio(
input_file: Path, output_file: Path
) -> tuple[float | None, float | None]:
input_size = input_file.stat().st_size
output_size = output_file.stat().st_size
if output_size == 0: