Add our own method for determining the bounding box

I found some pdfs where pdfcrop/ghostscript determined
the bounding box incorrectly. With this commit we introduce
a simple way to determine the bounding box by finding the
smallest rectangle that is completely surrounded by white
pixels. This will work well for most PDFs. The centering
functionality is also improved, and now correctly centers
the PDF on the reMarkable both vertically and horizontally.

1 files changed, 86 insertions, 1 deletions

diff --git a/poetry.lock b/poetry.lock
index 893007f..322114d 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -46,6 +46,51 @@ version = "2.8"
 
 [[package]]
 category = "main"
+description = "PDF parser and analyzer"
+name = "pdfminer.six"
+optional = false
+python-versions = "*"
+version = "20181108"
+
+[package.dependencies]
+pycryptodome = "*"
+six = "*"
+sortedcontainers = "*"
+
+[[package]]
+category = "main"
+description = "Plumb a PDF for detailed information about each char, rectangle, and line."
+name = "pdfplumber"
+optional = false
+python-versions = "*"
+version = "0.5.12"
+
+[package.dependencies]
+chardet = "*"
+"pdfminer.six" = "20181108"
+pillow = ">=3.0.0"
+pycryptodome = "*"
+unicodecsv = ">=0.14.1"
+wand = "*"
+
+[[package]]
+category = "main"
+description = "Python Imaging Library (Fork)"
+name = "pillow"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "6.0.0"
+
+[[package]]
+category = "main"
+description = "Cryptographic library for Python"
+name = "pycryptodome"
+optional = false
+python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "3.8.2"
+
+[[package]]
+category = "main"
 description = "Python HTTP for Humans."
 name = "requests"
 optional = false
@@ -60,6 +105,22 @@ urllib3 = ">=1.21.1,<1.25"
 
 [[package]]
 category = "main"
+description = "Python 2 and 3 compatibility utilities"
+name = "six"
+optional = false
+python-versions = ">=2.6, !=3.0.*, !=3.1.*"
+version = "1.12.0"
+
+[[package]]
+category = "main"
+description = "Sorted Containers -- Sorted List, Sorted Dict, Sorted Set"
+name = "sortedcontainers"
+optional = false
+python-versions = "*"
+version = "2.1.0"
+
+[[package]]
+category = "main"
 description = "A CSS4 selector implementation for Beautiful Soup."
 name = "soupsieve"
 optional = false
@@ -68,14 +129,30 @@ version = "1.7.3"
 
 [[package]]
 category = "main"
+description = "Python2's stdlib csv module is nice, but it doesn't support unicode. This module is a drop-in replacement which *does*."
+name = "unicodecsv"
+optional = false
+python-versions = "*"
+version = "0.14.1"
+
+[[package]]
+category = "main"
 description = "HTTP library with thread-safe connection pooling, file post, and more."
 name = "urllib3"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, <4"
 version = "1.24.1"
 
+[[package]]
+category = "main"
+description = "Ctypes-based simple MagickWand API binding for Python"
+name = "wand"
+optional = false
+python-versions = "*"
+version = "0.5.4"
+
 [metadata]
-content-hash = "bf39364b4d9cc98c89d858338ce8e7609e35fdd4a7e5cfe256f768c12ed7cb82"
+content-hash = "21a857f686e73e377feae7bf7c09ed5933d51a3f90ca77315408a3d7fc362c42"
 python-versions = "^3.5"
 
 [metadata.hashes]
@@ -84,6 +161,14 @@ bs4 = ["36ecea1fd7cc5c0c6e4a1ff075df26d50da647b75376626cc186e2212886dd3a"]
 certifi = ["47f9c83ef4c0c621eaef743f133f09fa8a74a9b75f037e8624f83bd1b6626cb7", "993f830721089fef441cdfeb4b2c8c9df86f0c63239f06bd025a76a7daddb033"]
 chardet = ["84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae", "fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691"]
 idna = ["c357b3f628cf53ae2c4c05627ecc484553142ca23264e593d327bcde5e9c3407", "ea8b7f6188e6fa117537c3df7da9fc686d485087abf6ac197f9c46432f7e4a3c"]
+"pdfminer.six" = ["f04d029d1d3e58c87da51bdefef2e9a1dbf2d7b63f727dd2a3e36054f5ae96ea"]
+pdfplumber = ["f2d6861c21730630347d4f97b2e635860e9cb4074972c60b7c443701f7bfa88f"]
+pillow = ["0683e80d81e840d401b687ebc00a02bbb23d0793c34d0852a5af64cfa1589540", "09c4e81c3277199898e8dc2d85d94febad87c41251ecbd447ba7d64d94765bd8", "0ee74a23022af9baf997e3016b4e090e4ff08688d37a6f49010338ab46cfe101", "10860baedfe5da7c43cd17835b091494dcc59dda5ad176a011713fe398ea6ac2", "15c056bfa284c30a7f265a41ac4cbbc93bdbfc0dfe0613b9cb8a8581b51a9e55", "1a4e06ba4f74494ea0c58c24de2bb752818e9d504474ec95b0aa94f6b0a7e479", "1c3c707c76be43c9e99cb7e3d5f1bee1c8e5be8b8a2a5eeee665efbf8ddde91a", "1fd0b290203e3b0882d9605d807b03c0f47e3440f97824586c173eca0aadd99d", "24114e4a6e1870c5a24b1da8f60d0ba77a0b4027907860188ea82bd3508c80eb", "258d886a49b6b058cd7abb0ab4b2b85ce78669a857398e83e8b8e28b317b5abb", "2734c55f7d054b0ad889c971136cbb0a5b35a921e27beaa44fdc2436af529c6e", "2ac36ec56727a95bd5a04dfca6abce1db8042c31ee73b65796a42f31fd52d009", "2bc1002b573d107c0b172a5da0f34b4900b2ddc6c3296b82d601e966d5ac1959", "33c79b6dd6bc7f65079ab9ca5bebffb5f5d1141c689c9c6a7855776d1b09b7e8", "367385fc797b2c31564c427430c7a8630db1a00bd040555dfc1d5c52e39fcd72", "3c1884ff078fb8bf5f63d7d86921838b82ed4a7d0c027add773c2f38b3168754", "44e5240e8f4f8861d748f2a58b3f04daadab5e22bfec896bf5434745f788f33f", "46aa988e15f3ea72dddd81afe3839437b755fffddb5e173886f11460be909dce", "492e1e4df823b57f9334f591c78a1e0e65a361e92594534e0568eeeeea56bbba", "50fb9e25d25cfcb50b2e6842c4e104e4f0b424be4624e1724532bf005c67589a", "5ceadd60dbd1e56ab7faffbfee1df5ecb83c3f0420e47f652cd5306d70eb0296", "74d90d499c9c736d52dd6d9b7221af5665b9c04f1767e35f5dd8694324bd4601", "7eeac51fc37e6b19631a4b8e38b8261a074efcf7cc27fc16a6bee4697af7aaa5", "809c0a2ce9032cbcd7b5313f71af4bdc5c8c771cb86eb7559afd954cab82ebb5", "85d1ef2cdafd5507c4221d201aaf62fc9276f8b0f71bd3933363e62a33abc734", "8c3889c7681af77ecfa4431cd42a2885d093ecb811e81fbe5e203abc07e0995b", "9218d81b9fca98d2c47d35d688a0cea0c42fd473159dfd5612dcb0483c63e40b", "9319215530e236822169cbe92426cdc18d16b88c943fdf365a6309a89876e335", "96ec275c83bf839972d6a7dd7d685fdfb6a3233c3c382ecff839d04e7d53955d", "9aa4f3827992288edd37c9df345783a69ef58bd20cc02e64b36e44bcd157bbf1", "9d80f44137a70b6f84c750d11019a3419f409c944526a95219bea0ac31f4dd91", "b7ebd36128a2fe93991293f997e44be9286503c7530ace6a55b938b20be288d8", "c30857e1fbf7d4a4b79d7d376eefaf293ea4307b8293d00a62e6f517f51bfe9b", "c4c78e2c71c257c136cdd43869fd3d5e34fc2162dc22e4a5406b0ebe86958239", "c5472ea3945e8f9eb0659f37fc1f592fd06f4f725f0f03774a8999ad8c130334", "c6a842537f887be1fe115d8abb5daa9bc8cc124e455ff995830cc785624a97af", "cf0a2e040fdf5a6d95f4c286c6ef1df6b36c218b528c8a9158ec2452a804b9b8", "cfd28aad6fc61f7a5d4ee556a997dc6e5555d9381d1390c00ecaf984d57e4232", "d0fd1ec2e7c3e0aeaae999efe83f5d0f42c1160a1f8be5120d40857d20baa452", "dca5660e25932771460d4688ccbb515677caaf8595f3f3240ec16c117deff89a", "de7aedc85918c2f887886442e50f52c1b93545606317956d65f342bd81cb4fc3", "e6c0bbf8e277b74196e3140c35f9a1ae3eafd818f7f2d3a15819c49135d6c062"]
+pycryptodome = ["0281dc6a65a4d0d9e439f54e0ad5faf27bfdc2ebe9ead36912bac74a0920fa2e", "02af9b284f5c9a55f06f5e4532c16c9b7bd958e293e93969934d864ef7bd87ee", "09da99372fb69762e4b9690291176a166cc351793e2e1c9405d29ca291503aa8", "0c2400ccfc049c3f24e65d4f02bb4208d86e408011019e455fab7f50d2b226c9", "2081dd6dce6b21bf3596427edaedd4f2561dce616893b162ed2c674f3a3ca70a", "28b86ec9fdb005a2a18e4862a3a7277046738825ee8dc89cda5657e75a396089", "2d790c0d4c0d5edcf5fbab4e2af7b03757e40c5ae8d217f0dfe9ddea37fe130f", "2f24906153dca16528cf5515b1afa9ef635423d5a654904e861765f88ca667b6", "30d283939896fa4bacbdb9fa86e6fd51e9a5b953a511e210b38481f697f289f5", "31f78b67f97830d137f74813c0502a181a03b43a32ed124049bb20428176c307", "33c1f3a380fd38ab4dd4372bef17e98002b360b52814bb1b077693b1bd06ec87", "34091e9a6650c44e25339f22fc821396f19f152f65be2546edd823a093fb5a04", "567fb73951ab6865a2eb1a0060b54be1e27302574f6c65879525bdf53fab49e1", "5bc40f8aa7ba8ca7f833ad2477b9d84e1bfd2630b22a46d9bbd221982f8c3ac0", "6b0a0ccf33c7a6100c569667c888335a4aaf0d22218cb97b4963a65d70f6c343", "71b93157f1ce93fc7cfff9359b76def2b4826a7ef7a7f95e070161368e7f584a", "7d939d511b7dac29b2d936706786771ecb8256e43fade5cdb0e8bc58f02b86cf", "7fbc5a93d52e4c51487f4648b00dc41700adb144d10fc567b05f852e76c243ad", "9cb94b8f9c915a5d2b273d612a25a8e5d67b49543f8eb6bcec0275ac46cda421", "a585ea1722f9731e75881d5ffcc51d11c794d244ac57e7c2a9cbb8d5ac729302", "a6458dd7a10ae51f6fce56bdfc79bf6d3b54556237045d09e77fbda9d6d37864", "a9fb92e948128bce0239b87c6efcf2cb1c5a703d0b41dd6835211e6fafd1c5df", "b0b6b4ca1c53e7d6ca9f2720919f63837f05e7a5f92912a2bc29bfd03ed3b54f", "b7d22c8d648aaa3a7ec785eda544402141eb78ac5ffbba4cbe2c3a1f52276870", "bc9560574a868cfa2ba781b7bb0b4685b08ea251697abfc49070ffc05e1cbee6", "c0c5a576f3f7b7de3f86889cb47eb51b59dc11db9cf1e2a0f51eb4d988010ea4", "e1c91c2fa942a71c98a7a1f462de6dbbe82f34b9267eb8131314d97bd13bf0d4", "ec936361ad78aa95382c313df95777795b8185aac5dd3ec5463363ea94b556fc"]
 requests = ["502a824f31acdacb3a35b6690b5fbf0bc41d63a24a45c4004352b0242707598e", "7bf2a778576d825600030a110f3c0e3e8edc51dfaafe1c146e39a2027784957b"]
+six = ["3350809f0555b11f552448330d0b52d5f24c91a322ea4a15ef22629740f3761c", "d16a0141ec1a18405cd4ce8b4613101da75da0e9a7aec5bdd4fa804d0e0eba73"]
+sortedcontainers = ["974e9a32f56b17c1bac2aebd9dcf197f3eb9cd30553c5852a3187ad162e1a03a", "d9e96492dd51fae31e60837736b38fe42a187b5404c16606ff7ee7cd582d4c60"]
 soupsieve = ["466910df7561796a60748826781ebe9a888f7a1668a636ae86783f44d10aae73", "87db12ae79194f0ff9808d2b1641c4f031ae39ffa3cab6b907ea7c1e5e5ed445"]
+unicodecsv = ["018c08037d48649a0412063ff4eda26eaa81eff1546dbffa51fa5293276ff7fc"]
 urllib3 = ["61bf29cada3fc2fbefad4fdf059ea4bd1b4a86d2b6d15e1c7c0b582b9752fe39", "de9529817c93f27c8ccbfead6985011db27bd0ddfcdb2d86f3f663385c6a9c22"]
+wand = ["c52d647a34205f9b3948baae739db461a7379a04818548fe8042b5ce751ea6ea", "e2e08e19a37c61e85eaa307fe319889af46fe4cac6c23e3ae668b96be3e497ff"]