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5983050d79
this should implement feature request of zoom mode for multi-columns page in #501 This PR depends on koreader/koreader-base#435 How to use? 1. Tap the top left corner of a PDF/Djvu page to get into the flipping mode 2. Double-tap on text block will zoom in to that column 3. Double-tap on any area will zoom out to an overview of the page 4. repeat step 2 to focus to another page block How does it work? 1. We first find the mask of text blocks in the page. (Pic 1) 2. Then we intersect page boxes with user tap to form a page block. (Pic 2) 3. Finally we zoom the page to the page block and center current view to that block. (Pic 3)