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Improve handling of images referenced in <a> tags and place large images in an image block
This commit is contained in:
Kovid Goyal
parent
44a50922cd
commit
05c1c36719
@ -36,7 +36,7 @@ from libprs500.ebooks.BeautifulSoup import BeautifulSoup, BeautifulStoneSoup, \
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Comment, Tag, NavigableString, Declaration, ProcessingInstruction
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from libprs500.ebooks.lrf.pylrs.pylrs import Paragraph, CR, Italic, ImageStream, \
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TextBlock, ImageBlock, JumpButton, CharButton, Bold, Space, \
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Plot, Image, BlockSpace, RuledLine, BookSetting
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Plot, Image, BlockSpace, RuledLine, BookSetting, Canvas
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from libprs500.ebooks.lrf.pylrs.pylrs import Span as _Span
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from libprs500.ebooks.lrf import ConversionError, option_parser, Book, PRS500_PROFILE
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from libprs500 import extract, filename_to_utf8
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@ -217,8 +217,10 @@ class HTMLConverter(object):
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PAGE_BREAK_PAT = re.compile(r'page-break-(?:after|before)\s*:\s*(\w+)', re.IGNORECASE)
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IGNORED_TAGS = (Comment, Declaration, ProcessingInstruction)
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# Fix <a /> elements
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MARKUP_MASSAGE = [(re.compile("(<\s*[aA]\s+.*\/)\s*>"),
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MARKUP_MASSAGE = [(re.compile("(<\s*[aA]\s+.*\/)\s*>"), #Close <a /> tags
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lambda match: match.group(1)+"></a>"),
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# Strip comments from <style> tags. This is needed as
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# sometimes there are unterminated comments
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(re.compile(r"<\s*style.*?>.*?(<\!--).*?<.\s*style\s*>", re.DOTALL|re.IGNORECASE),
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lambda match: match.group().replace('<!--', '').replace('-->', '')),
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]
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@ -442,10 +444,10 @@ class HTMLConverter(object):
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if not self.top.parent:
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if not previous:
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try:
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previous = get_valid_block(self.book.pages()[0])
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previous = self.book.pages()[0]
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except IndexError:
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previous = self.current_page
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else:
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raise ConversionError, self.file_name + ' does not seem to have any content'
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found = False
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for page in self.book.pages():
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if page == previous:
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@ -456,8 +458,6 @@ class HTMLConverter(object):
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if not self.top:
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continue
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break
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if not self.top.parent:
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self.top = get_valid_block(self.current_page)
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if not self.top or not self.top.parent:
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raise ConversionError, 'Could not parse ' + self.file_name
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@ -622,7 +622,8 @@ class HTMLConverter(object):
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textheight=self.profile.screen_height)
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if not self.images.has_key(path):
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self.images[path] = ImageStream(path)
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page.append(ImageBlock(self.images[path]))
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ib = ImageBlock(self.images[path])
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page.append(ib)
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self.book.append(page)
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def process_children(self, ptag, pcss):
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@ -725,6 +726,69 @@ class HTMLConverter(object):
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self.current_block = self.book.create_text_block(textStyle=self.current_block.textStyle,
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blockStyle=self.current_block.blockStyle)
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def process_image(self, path, tag_css, width=None, height=None):
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def scale_image(width, height):
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pt = PersistentTemporaryFile(suffix='.jpeg')
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im.resize((int(width), int(height)), PILImage.ANTIALIAS).convert('RGB').save(pt, 'JPEG')
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pt.close()
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self.scaled_images[path] = pt
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return pt.name
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if self.scaled_images.has_key(path):
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path = self.scaled_images[path].name
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im = PILImage.open(path)
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if width == None or height == None:
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width, height = im.size
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if height > self.profile.page_height:
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corrf = self.profile.page_height/(1.*height)
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width, height = floor(corrf*width), self.profile.page_height-1
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if width > self.profile.page_width:
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corrf = (self.profile.page_width)/(1.*width)
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width, height = self.profile.page_width-1, floor(corrf*height)
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path = scale_image(width, height)
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if width > self.profile.page_width:
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corrf = self.profile.page_width/(1.*width)
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width, height = self.profile.page_width-1, floor(corrf*height)
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if height > self.profile.page_height:
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corrf = (self.profile.page_height)/(1.*height)
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width, height = floor(corrf*width), self.profile.page_height-1
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path = scale_image(width, height)
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width, height = int(width), int(height)
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if not self.images.has_key(path):
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self.images[path] = ImageStream(path)
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im = Image(self.images[path], x0=0, y0=0, x1=width, y1=height,\
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xsize=width, ysize=height)
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factor = 720./self.profile.dpi
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self.process_alignment(tag_css)
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if max(width, height) <= min(self.profile.page_width,
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self.profile.page_height)/5.:
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self.current_para.append(Plot(im, xsize=ceil(width*factor),
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ysize=ceil(height*factor)))
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elif height <= int(floor((2/3.)*self.profile.page_height)):
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pb = self.current_block
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self.end_current_para()
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self.process_alignment(tag_css)
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self.current_para.append(Plot(im, xsize=width*factor,
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ysize=height*factor))
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self.current_block.append(self.current_para)
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self.current_page.append(self.current_block)
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self.current_block = self.book.create_text_block(
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textStyle=pb.textStyle,
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blockStyle=pb.blockStyle)
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self.current_para = Paragraph()
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else:
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self.end_page()
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self.current_page.append(Canvas(width=self.profile.page_width,
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height=height))
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left = int(floor((self.profile.page_width - width)/2.))
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self.current_page.contents[0].put_object(ImageBlock(self.images[path]),
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left, 0)
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def parse_tag(self, tag, parent_css):
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try:
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tagname = tag.name.lower()
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@ -798,73 +862,21 @@ class HTMLConverter(object):
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path = unquote(purl[2])
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if path and os.path.splitext(path)[1][1:].lower() in \
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['png', 'jpg', 'bmp', 'jpeg']:
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self.add_image_page(path)
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self.process_image(path, tag_css)
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else:
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self.add_text('Link: ' + tag['href'], tag_css)
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self.links.append(HTMLConverter.Link(self.current_para.contents[-1], tag))
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elif tagname == 'img':
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if tag.has_key('src') and os.access(unquote(tag['src']), os.R_OK):
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path = os.path.abspath(unquote(tag['src']))
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if self.scaled_images.has_key(path):
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path = self.scaled_images[path].name
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im = PILImage.open(path)
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width, height = im.size
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width, height = None, None
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try:
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width = int(tag['width'])
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height = int(tag['height'])
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except:
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pass
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self.process_image(path, tag_css, width, height)
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def scale_image(width, height):
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pt = PersistentTemporaryFile(suffix='.jpeg')
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im.resize((int(width), int(height)), PILImage.ANTIALIAS).convert('RGB').save(pt, 'JPEG')
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pt.close()
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self.scaled_images[path] = pt
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return pt.name
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if height > self.profile.page_height:
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corrf = self.profile.page_height/(1.*height)
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width, height = floor(corrf*width), self.profile.page_height-1
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if width > self.profile.page_width:
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corrf = (self.profile.page_width)/(1.*width)
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width, height = self.profile.page_width-1, floor(corrf*height)
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path = scale_image(width, height)
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if width > self.profile.page_width:
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corrf = self.profile.page_width/(1.*width)
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width, height = self.profile.page_width-1, floor(corrf*height)
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if height > self.profile.page_height:
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corrf = (self.profile.page_height)/(1.*height)
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width, height = floor(corrf*width), self.profile.page_height-1
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path = scale_image(width, height)
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width, height = int(width), int(height)
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if not self.images.has_key(path):
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self.images[path] = ImageStream(path)
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factor = 720./self.profile.dpi
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self.process_alignment(tag_css)
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if max(width, height) <= min(self.profile.page_width,
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self.profile.page_height)/5.:
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im = Image(self.images[path], x0=0, y0=0, x1=width, y1=height,\
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xsize=width, ysize=height)
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self.current_para.append(Plot(im, xsize=ceil(width*factor),
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ysize=ceil(height*factor)))
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else:
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pb = self.current_block
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self.end_current_para()
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self.process_alignment(tag_css)
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im = Image(self.images[path], x0=0, y0=0, x1=width, y1=height,\
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xsize=width, ysize=height)
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self.current_para.append(Plot(im, xsize=width*factor,
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ysize=height*factor))
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self.current_block.append(self.current_para)
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self.current_page.append(self.current_block)
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self.current_block = self.book.create_text_block(
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textStyle=pb.textStyle,
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blockStyle=pb.blockStyle)
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self.current_para = Paragraph()
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else:
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print >>sys.stderr, "Failed to process:", tag
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elif tagname in ['style', 'link']:
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@ -998,6 +1010,9 @@ class HTMLConverter(object):
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elif tagname in ['br', 'tr']:
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self.current_para.append(CR())
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self.process_children(tag, tag_css)
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elif tagname in ['td']:
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self.current_para.append(' ')
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self.process_children(tag, tag_css)
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elif tagname == 'hr':
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self.end_current_para()
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self.current_block.append(CR())
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@ -1208,6 +1223,9 @@ def main():
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try:
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options, args, parser = parse_options()
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src = args[0]
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if options.verbose:
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import warnings
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warnings.defaultaction = 'error'
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except:
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sys.exit(1)
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process_file(src, options)
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@ -70,7 +70,7 @@
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<h2><a name='images'>Inline images</a></h2>
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<p>
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Here I demonstrate the use of inline images in the midst of text. Here is a small image <img src='small.jpg' /> embedded in a sentence. Now we have a slightly larger image that is automatically put in its own block <img style="text-align:center" src='medium.jpg' /> and finally we have a large image which wont fit on this page. Try changing sizes from S to M to L and see how the images behave. <img align='center' src='large.jpg' />
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Here I demonstrate the use of inline images in the midst of text. Here is a small image <img src='small.jpg' /> embedded in a sentence. Now we have a slightly larger image that is automatically put in its own block <img style="text-align:center" src='medium.jpg' /> and finally we have a large image which is put on a page by itself. Try changing sizes from S to M to L and see how the images behave. <img align='center' src='large.jpg' />
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</p>
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<p class='toc'>
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<hr />
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@ -247,6 +247,7 @@ class LrsContainer(object):
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self.parent = None
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self.contents = []
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self.validChildren = validChildren
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self.must_append = False
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def has_text(self):
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@ -259,7 +260,7 @@ class LrsContainer(object):
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if child.has_text():
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return True
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for item in self.contents:
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if isinstance(item, (Plot, ImageBlock)):
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if isinstance(item, (Plot, ImageBlock, Canvas)):
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return True
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return False
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@ -268,7 +269,7 @@ class LrsContainer(object):
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Append self to C{parent} iff self has non whitespace textual content
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@type parent: LrsContainer
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'''
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if self.has_text():
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if self.has_text() or self.must_append:
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parent.append(self)
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@ -1870,24 +1871,28 @@ class CharButton(LrsSimpleChar1, LrsContainer):
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class Objects(LrsContainer):
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def __init__(self):
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LrsContainer.__init__(self, [JumpButton, TextBlock, HeaderOrFooter,
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ImageStream, Image])
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ImageStream, Image, ImageBlock])
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self.appendJumpButton = self.appendTextBlock = self.appendHeader = \
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self.appendFooter = self.appendImageStream = \
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self.appendImage = self.append
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self.appendImage = self.appendImageBlock = self.append
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def getMethods(self):
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return ["JumpButton", "appendJumpButton", "TextBlock",
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"appendTextBlock", "Header", "appendHeader",
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"Footer", "appendFooter",
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"Footer", "appendFooter", "ImageBlock",
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"ImageStream", "appendImageStream",
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'Image','appendImage']
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'Image','appendImage', 'appendImageBlock']
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def getSettings(self):
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return []
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def ImageBlock(self, *args, **kwargs):
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ib = ImageBlock(*args, **kwargs)
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self.append(ib)
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return ib
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def JumpButton(self, textBlock):
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b = JumpButton(textBlock)
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@ -2062,8 +2067,8 @@ class Canvas(LrsObject, LrsContainer, LrsAttributes):
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self.settings = self.defaults.copy()
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self.settings.update(settings)
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self.settings['canvasheight'] = height
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self.settings['canvaswidth'] = width
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self.settings['canvasheight'] = int(height)
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self.settings['canvaswidth'] = int(width)
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def put_object(self, obj, x, y):
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self.append(PutObj(obj, x=x, y=y))
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@ -2102,8 +2107,8 @@ class PutObj(LrsContainer):
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def __init__(self, content, x=0, y=0):
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LrsContainer.__init__(self, [TextBlock, ImageBlock])
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self.content = content
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self.x1 = x
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self.y1 = y
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self.x1 = int(x)
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self.y1 = int(y)
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def appendReferencedObjects(self, parent):
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