From 88ff091ccecfb6c185426ca0d4c874a7ab00b7d8 Mon Sep 17 00:00:00 2001
From: "James R. Barlow" <jim@purplerock.ca>
Date: Tue, 1 May 2018 13:24:20 -0700
Subject: [PATCH] Unify tesseract and sandwich renderer paths

Since the new weaving method copies the font and content
stream from the Tesseract PDF, it doesn't matter if Tesseract
happens to have an image or not.
If Tesseract is text-only capable we use that feature for efficiency,
but ignore the image either way.
---
 docs/pipeline.svg              | 823 ++++++++++++++++-----------------
 src/ocrmypdf/exec/tesseract.py |   2 +-
 src/ocrmypdf/pipeline.py       |  56 +--
 3 files changed, 407 insertions(+), 474 deletions(-)

diff --git a/docs/pipeline.svg b/docs/pipeline.svg
index bb461c94..8361bba4 100644
--- a/docs/pipeline.svg
+++ b/docs/pipeline.svg
@@ -4,470 +4,453 @@
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+<!-- t2&#45;&gt;t3 -->
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+<title>t2&#45;&gt;t3</title>
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+<!-- t3&#45;&gt;t4 -->
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+<title>t3&#45;&gt;t4</title>
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+<!-- t3&#45;&gt;t5 -->
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+<title>t3&#45;&gt;t5</title>
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+<title>t4&#45;&gt;t5</title>
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+</g>
+<!-- t5&#45;&gt;t6 -->
+<g id="edge7" class="edge">
+<title>t5&#45;&gt;t6</title>
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+</g>
+<!-- t5&#45;&gt;t16 -->
+<g id="edge15" class="edge">
+<title>t5&#45;&gt;t16</title>
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+</g>
+<!-- t5&#45;&gt;t13 -->
+<g id="edge21" class="edge">
+<title>t5&#45;&gt;t13</title>
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+<!-- t5&#45;&gt;t19 -->
+<g id="edge32" class="edge">
+<title>t5&#45;&gt;t19</title>
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+</g>
+<!-- t6&#45;&gt;t7 -->
+<g id="edge8" class="edge">
+<title>t6&#45;&gt;t7</title>
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+</g>
+<!-- t6&#45;&gt;t12 -->
+<g id="edge19" class="edge">
+<title>t6&#45;&gt;t12</title>
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+<!-- t8 -->
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+</g>
+<!-- t7&#45;&gt;t8 -->
+<g id="edge9" class="edge">
+<title>t7&#45;&gt;t8</title>
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+<!-- t7&#45;&gt;t12 -->
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+<title>t7&#45;&gt;t12</title>
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+<!-- t8&#45;&gt;t9 -->
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+<title>t8&#45;&gt;t9</title>
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+<title>t8&#45;&gt;t12</title>
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+<title>t9&#45;&gt;t12</title>
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+<title>t10&#45;&gt;t11</title>
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+<title>t22</title>
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+<text text-anchor="middle" x="679" y="-380.8166" font-family="Times,serif" font-size="20.00" fill="#000000">ocrmypdf.pipeline.merge_sidecars</text>
+</g>
+<!-- t11&#45;&gt;t22 -->
+<g id="edge40" class="edge">
+<title>t11&#45;&gt;t22</title>
+<path fill="none" stroke="#0044a0" d="M754.8759,-462.321C745.6854,-453.1755 734.09,-441.6369 722.7483,-430.3507"/>
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+</g>
+<!-- t14&#45;&gt;t17 -->
+<g id="edge23" class="edge">
+<title>t14&#45;&gt;t17</title>
+<path fill="none" stroke="#0044a0" d="M1440,-368.8034C1440,-351.6708 1440,-325.6387 1440,-305.7879"/>
+<polygon fill="#0044a0" stroke="#0044a0" points="1443.5001,-305.7714 1440,-295.7714 1436.5001,-305.7715 1443.5001,-305.7714"/>
+</g>
+<!-- t16&#45;&gt;t17 -->
+<g id="edge22" class="edge">
+<title>t16&#45;&gt;t17</title>
+<path fill="none" stroke="#0044a0" d="M423.7551,-461.9454C432.2558,-453.1007 441.6731,-441.9207 448,-430.3564 467.326,-395.032 441.6768,-368.5782 473,-343.2769 488.6951,-330.5991 1023.9298,-300.1127 1291.2068,-285.6289"/>
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-<title>t16&#45;&gt;t22</title>
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-<title>t19&#45;&gt;t22</title>
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-<title>t19&#45;&gt;t23</title>
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+<title>t16&#45;&gt;t22</title>
+<path fill="none" stroke="#0044a0" d="M457.0228,-462.321C487.2537,-452.0381 526.3796,-438.7296 563.3441,-426.1563"/>
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-<!-- t20&#45;&gt;t22 -->
-<g id="edge33" class="edge">
-<title>t20&#45;&gt;t22</title>
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-<polygon fill="#0044a0" stroke="#0044a0" points="1805.4063,-207.1923 1795.1135,-204.6804 1801.5933,-213.0627 1805.4063,-207.1923"/>
+<!-- t12&#45;&gt;t13 -->
+<g id="edge20" class="edge">
+<title>t12&#45;&gt;t13</title>
+<path fill="none" stroke="#0044a0" d="M1044.453,-537.0425C1090.7976,-526.4727 1146.7836,-513.704 1193.8777,-502.9632"/>
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-<text text-anchor="middle" x="1723" y="-53.5531" font-family="Times,serif" font-size="20.00" fill="#000000">ocrmypdf.pipeline.copy_final</text>
+<!-- t12&#45;&gt;t15 -->
+<g id="edge30" class="edge">
+<title>t12&#45;&gt;t15</title>
+<path fill="none" stroke="#0044a0" d="M946.8614,-530.3506C944.9813,-507.514 945.8899,-475.3833 961,-452.3564 973.5116,-433.2894 993.5483,-419.2759 1013.6406,-409.2185"/>
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-<!-- t22&#45;&gt;t24 -->
+<!-- t13&#45;&gt;t17 -->
+<g id="edge24" class="edge">
+<title>t13&#45;&gt;t17</title>
+<path fill="none" stroke="#0044a0" d="M1441.7799,-465.2142C1516.5232,-456.0688 1593.6782,-443.637 1605,-430.3564 1630.1081,-400.9042 1626.7355,-375.2989 1605,-343.2769 1591.383,-323.2155 1570.5555,-309.2942 1548.2343,-299.6337"/>
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+</g>
+<!-- t17&#45;&gt;t20 -->
+<g id="edge28" class="edge">
+<title>t17&#45;&gt;t20</title>
+<path fill="none" stroke="#0044a0" d="M1301.2383,-265.3242C1087.4111,-246.205 676.0608,-209.4245 426.976,-187.1527"/>
+<polygon fill="#0044a0" stroke="#0044a0" points="426.9845,-183.6396 416.7125,-186.235 426.361,-190.6118 426.9845,-183.6396"/>
+</g>
+<!-- t18&#45;&gt;t20 -->
+<g id="edge27" class="edge">
+<title>t18&#45;&gt;t20</title>
+<path fill="none" stroke="#0044a0" d="M220,-368.5908C220,-335.1014 220,-262.8295 220,-214.9755"/>
+<polygon fill="#0044a0" stroke="#0044a0" points="223.5001,-214.8609 220,-204.861 216.5001,-214.861 223.5001,-214.8609"/>
+</g>
+<!-- t18&#45;&gt;t21 -->
+<g id="edge34" class="edge">
+<title>t18&#45;&gt;t21</title>
+<path fill="none" stroke="#0044a0" d="M255.668,-368.8034C282.7268,-355.1381 320.9967,-335.8109 355.3245,-318.4745"/>
+<polygon fill="#0044a0" stroke="#0044a0" points="357.0735,-321.5123 364.422,-313.8801 353.9179,-315.2639 357.0735,-321.5123"/>
+</g>
+<!-- t23 -->
+<g id="node23" class="node">
+<title>t23</title>
+<polygon fill="#efa03b" stroke="#000000" points="161.0652,-47.332 328,-20.0049 494.9348,-47.332 494.779,-91.5483 161.221,-91.5483 161.0652,-47.332"/>
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+<text text-anchor="middle" x="328" y="-53.5531" font-family="Times,serif" font-size="20.00" fill="#000000">ocrmypdf.pipeline.copy_final</text>
+</g>
+<!-- t20&#45;&gt;t23 -->
 <g id="edge38" class="edge">
-<title>t22&#45;&gt;t24</title>
-<path fill="none" stroke="#0044a0" d="M1723,-124.9057C1723,-118.6774 1723,-112.2535 1723,-105.9763"/>
-<polygon fill="#0044a0" stroke="#0044a0" points="1726.5001,-105.6115 1723,-95.6115 1719.5001,-105.6115 1726.5001,-105.6115"/>
+<title>t20&#45;&gt;t23</title>
+<path fill="none" stroke="#0044a0" d="M258.0768,-130.184C266.7982,-121.3743 276.1282,-111.9499 285.0392,-102.9487"/>
+<polygon fill="#0044a0" stroke="#0044a0" points="287.5282,-105.4094 292.0763,-95.8404 282.5535,-100.4846 287.5282,-105.4094"/>
+</g>
+<!-- t15&#45;&gt;t21 -->
+<g id="edge35" class="edge">
+<title>t15&#45;&gt;t21</title>
+<path fill="none" stroke="#0044a0" d="M1005.2626,-368.7554C969.0731,-360.3621 924.9121,-350.6352 885,-343.2769 802.0689,-327.9873 709.9855,-314.0238 630.9044,-302.9508"/>
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+</g>
+<!-- t19&#45;&gt;t21 -->
+<g id="edge33" class="edge">
+<title>t19&#45;&gt;t21</title>
+<path fill="none" stroke="#0044a0" d="M351.7514,-724.1105C285.3188,-675.8338 121.4207,-542.3014 203,-452.3564 236.7512,-415.1441 393.2861,-466.6723 428,-430.3564 442.1375,-415.5664 442.1449,-363.2074 439.9161,-323.9111"/>
+<polygon fill="#0044a0" stroke="#0044a0" points="443.3962,-323.4852 439.2735,-313.7255 436.4101,-323.926 443.3962,-323.4852"/>
+</g>
+<!-- t21&#45;&gt;t23 -->
+<g id="edge37" class="edge">
+<title>t21&#45;&gt;t23</title>
+<path fill="none" stroke="#0044a0" d="M442.8749,-235.0071C445.8908,-202.6847 445.1767,-158.3414 426,-125.1062 421.1919,-116.7732 414.846,-109.2905 407.6891,-102.6266"/>
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diff --git a/src/ocrmypdf/exec/tesseract.py b/src/ocrmypdf/exec/tesseract.py
index b3f96093..64dfb2ae 100644
--- a/src/ocrmypdf/exec/tesseract.py
+++ b/src/ocrmypdf/exec/tesseract.py
@@ -316,7 +316,7 @@ def generate_pdf(*, input_image, skip_pdf, output_pdf, output_text,
     if pagesegmode is not None:
         args_tesseract.extend([psm(), str(pagesegmode)])
 
-    if text_only:
+    if text_only and has_textonly_pdf():
         args_tesseract.extend(['-c', 'textonly_pdf=1'])
 
     if user_words:
diff --git a/src/ocrmypdf/pipeline.py b/src/ocrmypdf/pipeline.py
index a90e3a53..61846147 100644
--- a/src/ocrmypdf/pipeline.py
+++ b/src/ocrmypdf/pipeline.py
@@ -939,40 +939,6 @@ def weave_layers(
 #         pdf_output.write(out)
 
 
-def ocr_tesseract_and_render_pdf(
-        infiles,
-        outfiles,
-        log,
-        context):
-    options = context.get_options()
-    input_image = next((ii for ii in infiles if ii.endswith('.image')), '')
-    input_pdf = next((ii for ii in infiles if ii.endswith('.pdf')))
-    output_pdf = next((ii for ii in outfiles if ii.endswith('.pdf')))
-    output_text = next((ii for ii in outfiles if ii.endswith('.txt')))
-
-    if not input_image:
-        # Skipping this page
-        re_symlink(input_pdf, output_pdf, log)
-        with open(output_text, 'w') as f:
-            f.write('[skipped page]')
-        return
-
-    tesseract.generate_pdf(
-        input_image=input_image,
-        skip_pdf=input_pdf,
-        output_pdf=output_pdf,
-        output_text=output_text,
-        language=options.language,
-        engine_mode=options.tesseract_oem,
-        text_only=False,
-        tessconfig=options.tesseract_config,
-        timeout=options.tesseract_timeout,
-        pagesegmode=options.tesseract_pagesegmode,
-        user_words=options.user_words,
-        user_patterns=options.user_patterns,
-        log=log)
-
-
 def ocr_tesseract_textonly_pdf(
         infiles,
         outfiles,
@@ -1025,9 +991,7 @@ def get_pdfmark(base_pdf, options):
     if options.subject:
         pdfmark['/Subject'] = options.subject
 
-    if options.pdf_renderer == 'tesseract':
-        renderer_tag = 'OCR+PDF'
-    elif options.pdf_renderer == 'sandwich':
+    if options.pdf_renderer == 'sandwich':
         renderer_tag = 'OCR-PDF'
     else:
         renderer_tag = 'OCR'
@@ -1438,7 +1402,8 @@ def build_pipeline(options, work_folder, log, context):
                 os.path.join(work_folder, r'\1.text.txt')],
         extras=[log, context])
     task_ocr_tesseract_textonly_pdf.graphviz(fillcolor='"#ff69b4"')
-    task_ocr_tesseract_textonly_pdf.active_if(options.pdf_renderer == 'sandwich')
+    task_ocr_tesseract_textonly_pdf.active_if(
+        options.pdf_renderer == 'tesseract' or options.pdf_renderer == 'sandwich')
 
     task_weave_layers = main_pipeline.collate(
         task_func=weave_layers,
@@ -1451,19 +1416,6 @@ def build_pipeline(options, work_folder, log, context):
         output=os.path.join(work_folder, r'layers.rendered.pdf'),
         extras=[log, context])
     task_weave_layers.graphviz(fillcolor='"#00cc66"')
-    task_weave_layers.active_if(options.pdf_renderer == 'hocr' or 
-                                options.pdf_renderer == 'sandwich')
-
-    # Tesseract OCR+PDF
-    task_ocr_tesseract_and_render_pdf = main_pipeline.collate(
-        task_func=ocr_tesseract_and_render_pdf,
-        input=[task_select_visible_page_image, task_orient_page],
-        filter=regex(r".*/(\d{6})(?:\.image|\.ocr\.oriented\.pdf)"),
-        output=[os.path.join(work_folder, r'\1.rendered.pdf'),
-                os.path.join(work_folder, r'\1.rendered.txt')],
-        extras=[log, context])
-    task_ocr_tesseract_and_render_pdf.graphviz(fillcolor='"#66ccff"')
-    task_ocr_tesseract_and_render_pdf.active_if(options.pdf_renderer == 'tesseract')
 
     # PDF/A
     task_generate_postscript_stub = main_pipeline.transform(
@@ -1498,7 +1450,6 @@ def build_pipeline(options, work_folder, log, context):
         input=[task_repair_and_parse_pdf,
                task_render_hocr_debug_page,
                task_skip_page,
-               task_ocr_tesseract_and_render_pdf,
                task_generate_postscript_stub],
         output=os.path.join(work_folder, 'merged.pdf'),
         extras=[log, context])
@@ -1507,7 +1458,6 @@ def build_pipeline(options, work_folder, log, context):
     task_merge_sidecars = main_pipeline.merge(
         task_func=merge_sidecars,
         input=[task_ocr_tesseract_hocr,
-               task_ocr_tesseract_and_render_pdf,
                task_ocr_tesseract_textonly_pdf],
         output=options.sidecar,
         extras=[log, context])