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Text can be rendered in various ways in PDFs: Filled, stroked, both filled and stroked, set as clipping path, hidden, or some combinations thereof. We don't implement any of this at the moment except "filled". Hidden text is used in scanned documents: The image of the scan is drawn in the background, and then OCRd text is "drawn" as hidden on top of the scanned bitmap. That way, the (hidden) text can be selected and copied, and it looks like you're selecting text from the scanned bitmap. Find-in-page also works similarly. (We currently have neither text selection nor find-in-page, but one day we will.) Now that we have pretty good support for CCITT and are growing some support for JBIG2, we now draw both the scanned background image as well as the foreground text. They're not always perfectly aligned. This change makes it so that we don't render text that's marked as hidden. (We still do most of the coordinate math, which will probably come in handy at some point when we implement text selection.) This makes these scanned documents appear as they're supposed to appear (at least in documents where we manage to decode the background bitmap). This also adds a debug option to force rendering of hidden text. |
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| .. | ||
| CMakeLists.txt | ||
| main.cpp | ||
| OutlineModel.cpp | ||
| OutlineModel.h | ||
| PDFViewer.cpp | ||
| PDFViewer.h | ||
| PDFViewerWidget.cpp | ||
| PDFViewerWidget.h | ||
| SidebarWidget.cpp | ||
| SidebarWidget.h | ||