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Allow HTML files to control how they rendered as covers

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Fixes #1064 (Add render page tweak settings.)
This commit is contained in:
Kovid Goyal 2019-10-30 10:13:17 +05:30
parent 6dc53379ee
commit 8999853fc6
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GPG Key ID: 06BC317B515ACE7C
1 changed files with 34 additions and 5 deletions
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39
src/calibre/ebooks/render_html.py
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@ -10,13 +10,13 @@ import sys
from PyQt5.Qt import (
QApplication, QMarginsF, QPageLayout, QPageSize, Qt, QTimer, QUrl
)
from PyQt5.QtWebEngineWidgets import QWebEnginePage
from PyQt5.QtWebEngineWidgets import QWebEnginePage, QWebEngineScript
from calibre.ebooks.metadata.pdf import page_images
from calibre.gui2 import must_use_qt
from calibre.gui2.webengine import secure_webengine
from calibre.utils.monotonic import monotonic
from calibre.utils.filenames import atomic_rename
from calibre.utils.monotonic import monotonic
LOAD_TIMEOUT = 20
PRINT_TIMEOUT = 10
@ -36,11 +36,24 @@ class Render(QWebEnginePage):
def load_finished(self, ok):
if ok:
self.start_print()
self.runJavaScript('''
var ans = {};
var meta = document.querySelector('meta[name=calibre-html-render-data]');
if (meta) {
try {
ans = JSON.parse(meta.content);
console.log(ans);
} catch {}
}
ans;
''', QWebEngineScript.ApplicationWorld, self.start_print)
else:
self.hang_timer.stop()
QApplication.instance().exit(1)
def javaScriptConsoleMessage(self, level, msg, linenumber, source_id):
pass
def start_load(self, path_to_html):
self.load(QUrl.fromLocalFile(path_to_html))
self.start_time = monotonic()
@ -56,9 +69,25 @@ class Render(QWebEnginePage):
self.hang_timer.stop()
QApplication.instance().exit(3)
def start_print(self):
def start_print(self, data):
margins = QMarginsF(0, 0, 0, 0)
page_layout = QPageLayout(QPageSize(QPageSize.A4), QPageLayout.Portrait, margins)
page_size = QPageSize(QPageSize.A4)
if isinstance(data, dict):
try:
if 'margins' in data:
margins = QMarginsF(*data[margins])
if 'size' in data:
sz = data['size']
if type(getattr(QPageSize, sz, None)) is type(QPageSize.A4): # noqa
page_size = QPageSize(getattr(QPageSize, sz))
else:
from calibre.ebooks.pdf.image_writer import parse_pdf_page_size
ps = parse_pdf_page_size(sz, data.get('unit', 'inch'))
if ps is not None:
page_size = ps
except Exception:
pass
page_layout = QPageLayout(page_size, QPageLayout.Portrait, margins)
self.printToPdf('rendered.pdf', page_layout)
self.printing_started = True
self.start_time = monotonic()