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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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Review URL: https://codereview.chromium.org/1864153002
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This CL is a straight move of the fxge includes into core/fxge/include.
Review URL: https://codereview.chromium.org/1868533002
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Copy code from the agg driver so that the Skia
driver is no longer dependent on it.
The copied code doesn't in turn call
agg; it was in the agg driver for convenience.
Much of the copied code will eventually be replaced
by native Skia code, so there's not much point
in rewriting it to make it more efficient or
maintainable.
R=dsinclair@chromium.org,tsepez@chromium.org
Review URL: https://codereview.chromium.org/1865883002
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One bit bitmaps may be black and white or may be alpha masks.
Treat alpha masks as transparent/opaque instead of black/white.
R=dsinclair@chromium.org
Review URL: https://codereview.chromium.org/1858613003
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Reuse the Skia typeface on sucessive text draw calls.
This reduces the SKP size by 100x for some documents.
Note that this does not use a smart pointer for the
Skia typeface object. The downside of doing so is that
it requires all clients that include fx_font.h to also
have access to Skia.
In this specific case, it is preferable to have a
forward declared class to isolate Skia from the rest of PDFium.
R=dsinclair,tsepez@chromium.org
Review URL: https://codereview.chromium.org/1837113004
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Review URL: https://codereview.chromium.org/1832173003
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To draw paths that are stroked and filled with a pair of colors,
reduce the fill by the width of the stroke. This is implemented
with path ops subtracting the resolved stroke shape from the
fill shape. This permits rendering the result without requiring
an offscreen bitmap.
The implementation for stroke+fill requires a new entry into
the graphics engine, so a bit was added to device caps for that.
Extract the gradient information out of the axial gradient
function descriptions, and when possible, use Skia to draw
the linear gradient directly. This requires making the function
descriptions non-opaque, and adding a bit to device caps for
another entry into the graphics engine.
BUG=
Review URL: https://codereview.chromium.org/1828283002
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Use FreeType instead of Direct Write on Windows. Since PDFium
currently uses the graphics engine to draw but not to measure,
the graphics engine needs to always use FreeType to get
consistent metrics.
Add a translation from PDF's blend modes to Skia's xfer modes.
Turn on subpixel positioning for text to get more precise
glyph placement.
Pass the alpha through to get proper bitmap transparency.
Address earlier nits.
R=dsinclair@chromium.org, tsepez@chromium.org, dsinclair
Review URL: https://codereview.chromium.org/1812263002 .
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More Skia driver cleanup.
Fix the GN build for Skia.
Remove unused functions from header.
Remove agg setup that is not required.
Change path construction to use the SkCanvas matrix to position the path
rather than converting the points directly.
Draw stroked paths using Skia rather than generated the filled path.
Pin the minimum stroke width to 1 px in device space to mimic PDF's stroke
dropout control.
Factor out flipped and non-flipped matrices.
Add some debugging code.
Set the bitmap filter quality to high. This helps a lot with 1 bit sources.
R=dsinclair@chromium.org, dsinclair, tsepez
Review URL: https://codereview.chromium.org/1806843002 .
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This CL adds the necessary pieces so you can add pdf_use_skia=1 to GYP_DEFINES
and do a standalone build.
R=caryclark@google.com
Review URL: https://codereview.chromium.org/1812563002 .
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This Cl moves a bunch of the files from core/include/fpdfapi to their correct
location outside the core/include tree.
R=tsepez@chromium.org
Review URL: https://codereview.chromium.org/1805603002 .
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This is a first-cut at supporting bitmaps.
Also added a --skp option to pdfium_test to generate
a Skia picture file. The picture file can be loaded
in Skia's SampleApp, debugger, or skiaserver to
examine the generated picture.
(This also includes fixes suggested in the prior Skia CL.
My apologies for fat-fingers abandoning that one.)
R=dsinclair@chromium.org, tsepez@chromium.org, dsinclair
Review URL: https://codereview.chromium.org/1776313002 .
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This CL moves the core/src/ files up to core/ and fixes up the include guards,
includes and build files.
R=tsepez@chromium.org
Review URL: https://codereview.chromium.org/1800523005 .
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