Fits a cubic to an arc on the unit circle using the following
constraints:
1) The endpoints and tangent directions at the endpoints must match
the arc.
2) The cubic must be symmetric (length(p1 - p0) == length(p3 - p2)).
3) The height of the cubic must match the height of the arc.
Using the above constraints, we arrive at the following formula for the
control length (c) (i.e., lengths of (p1 - p0) and (p3 - p2)):
d = x0*x1 + y0*y1
c = (sqrt(1 + d) * kM + kA) * rsqrt(1 - d)
(Where x0,y0,x1,y1 are the endpoints, kM = -4/3, and kA = 4/3 * sqrt(2).)
The sample also comes with a root finder that finds the max error value
of the curve, which ends up serving as a semi-formal proof that:
1) Max error always occurs at T=0.21132486540519, regardless of
endpoints.
2) Error is reduced by exactly 64x each time we halve the arc angle
Change-Id: I29ad60dda06743d79f71275c38ffdd97261159ac
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/295303
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Mike Reed <reed@google.com>
Bug: skia:10139
Change-Id: I20cd95fcf5f11832366c32e48ed4d442c82b0719
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/284082
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
The CheckGeneratedFiles bot only required rewriting
.gn files, while the presubmit wants both .gn and .gni files.
It also appears that the #includes rewrite script runs on
both the presubmit and CheckGeneratedFiles bots.
These presubmits run on the CQ before landing right?
If so, no need for them in the CheckGeneratedFIles bot at all.
And of course, format .gni files.
Change-Id: Icd4526d62f85088862ad93566cc9ace11dc3e33f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/281505
Reviewed-by: Eric Boren <borenet@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
Change-Id: I60a3569b47b599b710c0f3a9522241748f15360d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/280409
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Reed <reed@google.com>
Adds a "viewer" option to the build system that brings in tooling code
and sample code. Adds a very simple "MakeSlide" binding that knows
how to create the WavyPathText sample slide. Adds viewer.html with
code to animate viewer slides.
This can hopefully be the starting point for future work on bringing
viewer to CanvasKit.
Change-Id: Ia26e08726384b40b3f544fe8254f430dc9db08db
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/278892
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Implements a simple first pass for a path renderer that uses the
classic Red Book "stencil then cover" method, and linearizes curves
with GPU tessellation shaders.
The new path renderer is disabled by default, and can only be enabled
in the viewer UI or by passing the "--pr gtess" flag.
Change-Id: Ic9354952e93c8b108577961760b4f0daa82d35aa
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/261715
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
The DrawDeviceWithFilter function used to rely on SkImageFilter's
applyCTMForBackdrop, which would create a new DAG and use an
SkMatrixImageFilter node to account for the transformation. However,
that filter is really meant to perform a transformation prior to the
CTM matrix. Abusing matrix math to instead have it map the backdrop
contents back into the CTM local space grossly inflated the size of the
temporary images needed when under many perspective transforms.
This CL instead takes over control of the CTM decomposition and draws
the backdrop (src) content into a temporary layer directly, and then
feeds that through the image filtering. The code is somewhat cumbersome
to follow because of the combination of coordinate spaces and need to
make everything relative to the top left corner of the images.
When the rest of my image filter refactor is more underway, I believe that
a lot of the coordinate space math and image origin accounting will
be much cleaner, but the overall backdrop filtering strategy would remain
similar to this new implementation.
Bug: skia:9074
Change-Id: Ibd2995e81d2b308c74b2d298da5e38daa74c8677
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/239108
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Maximum ring buffer size is based on the maxBufferLength of
the system. Also includes a sample for testing upload pressure.
Bug: skia:8243
Change-Id: I36863b725ba9cbcb02d575b2ab9695d186fcd529
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/232759
Reviewed-by: Greg Daniel <egdaniel@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
We can't remove the loopers themselves, as they are still used
by android and chrome (they just don't ever pass them to skia).
Eventually each of those clients will resolve this, but for now
we just keep the classes (and tests) in skia.
Bug: skia:4783
Change-Id: I5f507e6bb82280f2bc7c0b21eebe59c287aa9265
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/230579
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Mike Reed <reed@google.com>
Change-Id: I04493af0a6ce1425c4acf68365135722dd3c218b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/227857
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
SampleBigBlur is super simple and now covered by gms and AnimBlur
sample.
SampleBigGradient now has a gm shallow_gradient_linear.
SampleConcavePaths has a more complete gm concavepaths.
SamplePoints now has an almost exact gm.
RasterAllocatorSample is made into a gm so that it will be run by d. It
appears to be the only test of SkRasterHandleAllocator, so it should
probably run.
Change-Id: Iad7b99d0f92898fc4b2fdccc5aae35d0277f2fff
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/219400
Reviewed-by: Hal Canary <halcanary@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
Change-Id: Ide69d3c9f0f02e886bd0d52723d425a548edd2e0
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/214187
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Updates the handling of perspective quads to calculate the correct,
degenerate-safe projected quad and then derive from that the proper
perspective quad.
In 2D, updated to determine if the optimized outset/inset procedure
is valid, and if not goes through a more robust procedure that is
based on line equation intersections. In particular, the degenerate
inset/outset approach is used when the quad has a zero-length edge,
if insetting/outsetting normally would create a self-intersecting shape,
or if near parallel edge angles would create numerical instabilities.
Performance testing by forcing all rectangle draws through the degenerate
code path suggests that it is about 10% slower than the optimal approach,
at least on my workstation...
Bug: skia:
Change-Id: I2973da8d97949eacebb09a1b27c334d62c1c948e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/194008
Reviewed-by: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
We now have a real fuzzer, and these samples only run on local dev
machine anyway, so their current utility is quite low since they don't
demonstrate any specific behavior.
Bug: skia:8259
Change-Id: If44a0eaa161b1d7688dd3de6431414a84b7bd6c6
Reviewed-on: https://skia-review.googlesource.com/c/194862
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
will flesh out more over time.
Bug: skia:
Change-Id: If5eaf0a7c404b9209b93871eb3ac3d74da8c65dd
Reviewed-on: https://skia-review.googlesource.com/c/191003
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Mike Reed <reed@google.com>
Bug: skia:
Change-Id: I3c29dee38f6fb43a2d1d5d429193fcf4a719a2cb
Reviewed-on: https://skia-review.googlesource.com/c/186863
Reviewed-by: Chris Dalton <csmartdalton@google.com>
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Skia can now build if we mark drawPosText as private,
Will hide/remove next (after Chrome CL)
Bug: skia:
Change-Id: I156560b025c119af302545bb5bd60678f7b8e8f7
Reviewed-on: https://skia-review.googlesource.com/c/179985
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
Auto-Submit: Mike Reed <reed@google.com>
This sample has had a gm counterpart for a long time now, and is also full
of dead code. It isn't adding anything to our understanding of Skia, so
remove it.
Change-Id: I6f3b0ff454b603815d66480ec11c8426717578be
Reviewed-on: https://skia-review.googlesource.com/c/173764
Commit-Queue: Ben Wagner <bungeman@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
Auto-Submit: Ben Wagner <bungeman@google.com>
There were two copies of a Nima "player" and this moves them out of
samplecode/ and viewer/ to experimental/ where it is a bit more
accessible (e.g. for WebAssembly).
Bug: skia:
Change-Id: I05419a352f0d13d16b462a374578107513eb1243
Reviewed-on: https://skia-review.googlesource.com/c/166441
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Most of this was entirely unused. Some was only used by the dithering
sample (which is now also deleted).
Bug: skia:
Change-Id: Ibafe61e9b19cae8738fd8df2c94dca182722e2e6
Reviewed-on: https://skia-review.googlesource.com/155921
Auto-Submit: Brian Osman <brianosman@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Add a circle at the cusp to match Adobe Illustrator,
Microsoft Edge, and our own CCPR implementation.
R=reed@google.com,csmartdalton@google.com
Bug: skia:5623
Change-Id: Ia46c910643f373e50c4b30303fcac5f79d77be62
Reviewed-on: https://skia-review.googlesource.com/150370
Commit-Queue: Cary Clark <caryclark@skia.org>
Reviewed-by: Mike Reed <reed@google.com>
What is left of the SkView system is used only by samples or viewer.
As a result, move it out of the Skia source tree and re-organize so it
is a bit easier to understand and use more shared code.
Move samplecode/ClockFaceView.cpp to samplecode/SampleTextEffects.cpp,
sice that's what's actually in it.
Move SkAnimTimer.h to tools/timer, since it's actually shared between gm
and samples.
Change-Id: I55dafd94c64e4f930ddbd19168e0f812af86c455
Reviewed-on: https://skia-review.googlesource.com/146161
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
Bug: skia:
Change-Id: I305ca837d5ed35df4b519e7283201f0a0f87b1c3
Reviewed-on: https://skia-review.googlesource.com/136636
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Ruiqi Mao <ruiqimao@google.com>
improved third_party template to include headers as system headers for non-Windows machines
Bug: skia:
Change-Id: Id2fa74fc31b49f9b07cc83e7f60477c7ab4f8d83
Reviewed-on: https://skia-review.googlesource.com/135450
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
We need to handle the bounds for transformed color emoji the same
way we handle the bounds for distance field text. Without this
bounds correction, the glyphs were being clipped out.
Also adds a sample to test this case.
Bug: 848616
Change-Id: I39dedbe2fd19331ad67978c95519f5c9d46f59fc
Reviewed-on: https://skia-review.googlesource.com/131523
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
Auto-Submit: Jim Van Verth <jvanverth@google.com>
* relocate all SkSG-related files under modules/sksg/
* fix various tidbits to make non-sksg builds possible
* drop obsolete SampleSGInval.cpp
Change-Id: I54e6c5bb1a09f45030fa8d607b3eb3f7cba78957
Reviewed-on: https://skia-review.googlesource.com/130025
Commit-Queue: Florin Malita <fmalita@chromium.org>
Reviewed-by: Mike Klein <mtklein@google.com>
Bug: skia:
Change-Id: If8d2f46b8f27fefc3a0f983eb649654e0fb4afcb
Reviewed-on: https://skia-review.googlesource.com/108685
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
On certain iOS devices half has a mantissa of only 10 bits, which is not
enough to perform the floating point trickery to get the lower bits
out of the "texture coordinates". Instead we use int if available, and
float if not available.
Also re-enables multitexturing for iOS and adds a sample which
stresses the issue, and a version of fontcache that tests multitexturing.
Bug: skia:7285
Change-Id: Ia541b6a418c1860c941071750ceb26459eb846ea
Reviewed-on: https://skia-review.googlesource.com/99800
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Bug: b/63909536
SkAnimatedImage is a simple drawable for animating a GIF. Thread-safety
is left up to the client. At most two bitmaps are stored in the
drawable; one for the current frame and one for a frame that may need to
be restored. The backup frame prevents some cases where we would
otherwise have to re-decode from the beginning of the image.
The API lets the client set the time value, and decodes to match that
time.
TODO:
- Callback for when the animation is complete
- Ability to use SkAndroidCodec
- Modify the loop count (or leave that up to client?)
- Better and/or client-specific caching
Other changes:
- Add a sample which animates a GIF
- Reenable SK_CODEC_PRINTF for debug builds and Android
Change-Id: I945ffbccdb6008f2a05ed4d9b2af869a261fb300
Reviewed-on: https://skia-review.googlesource.com/93420
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Commit-Queue: Leon Scroggins <scroggo@google.com>
Bug: skia:
Change-Id: I41480aa89dfcd8cb7e016e477cbabe354f35ce8a
Reviewed-on: https://skia-review.googlesource.com/75480
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
This reverts commit 999ec57291.
Reason for revert: Causing issues with NexusPlayer Vulkan.
Original change's description:
> Use int when possible to calculate atlas indices in shaders.
>
> On certain iOS devices half has a mantissa of only 10 bits, which is not
> enough to perform the floating point trickery to get the lower bits
> out of the "texture coordinates". Instead we use int if available, and
> float if not available.
>
> Also re-enables multitexturing for iOS and adds a sample which
> stresses the issue.
>
> Bug: skia:7285
> Change-Id: I365532c7cbbcca7c7753af209bef46e05be49e11
> Reviewed-on: https://skia-review.googlesource.com/71181
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Commit-Queue: Jim Van Verth <jvanverth@google.com>
TBR=jvanverth@google.com,bsalomon@google.com,robertphillips@google.com
Change-Id: I82801a73a2a8067588049b213f010ff25f4014f3
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:7285
Reviewed-on: https://skia-review.googlesource.com/74001
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
On certain iOS devices half has a mantissa of only 10 bits, which is not
enough to perform the floating point trickery to get the lower bits
out of the "texture coordinates". Instead we use int if available, and
float if not available.
Also re-enables multitexturing for iOS and adds a sample which
stresses the issue.
Bug: skia:7285
Change-Id: I365532c7cbbcca7c7753af209bef46e05be49e11
Reviewed-on: https://skia-review.googlesource.com/71181
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Bug: chromium:712455
Change-Id: Ic9bb9b862abe01f112cc41d28589733460b15bc1
Reviewed-on: https://skia-review.googlesource.com/50181
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
Initial implementation of a GPU path renderer that draws antialiased
paths by counting coverage in an offscreen buffer.
Initially disabled until it has had time to soak.
Bug: skia:
Change-Id: I003d8cfdf8dc62641581b5ea2dc4f0aa00108df6
Reviewed-on: https://skia-review.googlesource.com/21541
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
Bug: skia:
Change-Id: Ib9bd9083da1d8a9fa90ae7c710386e6903541fd5
Reviewed-on: https://skia-review.googlesource.com/18148
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Also, remvoes SkNormalBevelSource as this was the last use case for the distance vector field.
Change-Id: Ib0176c78e500e6b5130310934253a75860245812
Reviewed-on: https://skia-review.googlesource.com/18482
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
Change-Id: I889a3f508407178c457f675c321880d869caf9ea
Reviewed-on: https://skia-review.googlesource.com/17717
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
