Emmeran Seehuber created PDFBOX-4363:
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Summary: [Patch] Add a common interface PDShadingPaint for all
shading paints
Key: PDFBOX-4363
URL: https://issues.apache.org/jira/browse/PDFBOX-4363
Project: PDFBox
Issue Type: Improvement
Reporter: Emmeran Seehuber
Attachments: pdshadingpaint_base_interface.patch
The attached patch adds an common interface PDShadingPaint to all
PDShading-based Paint's. It allows to access the underlying PDShading object
and the matrix of the paint.
At the moment it is not possible to access this fields without using dirty
accessibility hacks, see also [this
commit|https://github.com/rototor/pdfbox-graphics2d/commit/8603f6f9c781604d4684b8cb46499703c34b4711].
Why would you need that? I need that for my
[PdfBoxGraphics2D|https://github.com/rototor/pdfbox-graphics2d] adapter. I draw
PDF pages using PDFRenderer/PageDrawer back into a PDF. While doing so I derive
from both classes and change / filter certain aspects of the PDF. One use case
is to extract a specific seperation color into its own PDF page, remap it to
another color and also draw some overfill (i.e. a additional border of 0.5pt
around all shapes drawn with this color). This so prepared page is then used
with a machine which glues foil (gold, silver or copper) on the places marked
with that color.
You can look at an [example
here|https://github.com/rototor/pdfbox-graphics2d/blob/master/src/test/java/de/rototor/pdfbox/graphics2d/PdfRerenderTest.java],
it does not use a seperation color, but you should get the idea.
My long term goal is to be able to use PDFBox for all possible pre-press PDF
manipulations. E.g. changing/remapping colorspaces, resampling images to the
target resolution, ...
At the moment I know of this "special cases" which will need a special
treatment, as they are normally handled through rendering them first into a
BufferedImage:
- Transparency groups
- Softmasks
Are there other places which resort to rendering to a BufferedImage first?
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