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Add checks to pass unit tests.
R=thestig@chromium.org,dsinclair@chromium.org
BUG=pdfium:525, pdfium:526, pdfium:527, pdfium:528, pdfium:529
Review-Url: https://codereview.chromium.org/2111553003
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PDFium assumes the lowest common denominator
and draws many strings and paths that can
be accumulated.
Defer canvas->restore() calls until required
because the clip changed.
Defer text and path draws as long as subsequent
calls concatenate additional data.
Include debugging switch to allow disabling cache
at compile-time while bugs are shaken out.
Review-Url: https://codereview.chromium.org/2064753002
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Review-Url: https://codereview.chromium.org/1990153003
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Using these webpages as guides
http://www.globelegislators.org/pdfjs/test/pdfs/alphatrans.pdf
http://www.antennahouse.com/antenna1/wp-content/uploads/2015/07/background-image-gradient-1.pdf
flesh out the gradient shaders to include the PostScript Type 0
sampling function and to include radial gradients. This CL makes
rendering these pages agree with Adobe Reader output.
Some of these examples use an Extend array to clip the gradient.
Skia does not currently support this natively, so construct the
clip manually for now.
Other PDF pages may construct gradients using alternate mechanisms
-- this code will continue to be refactored as those come to light.
In particular, this CL sets up the clip and matrix differently for
axial gradients and radial gradients -- while it makes sense to do
it one way only, I prefer to defer until I have more examples to
work with.
R=dsinclair@chromium.org,tsepez@chromium.org
Review URL: https://codereview.chromium.org/1870463002
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