History log of /external/skia/src/pathops/SkPathOpsDebug.cpp
Revision Date Author Comments (<<< Hide modified files) (Show modified files >>>)
c7c76d81fd09332a9a1d4b9f19b2a2dab3c723c3 18-Apr-2017 Cary Clark <caryclark@skia.org> keep integral rectangle intersections integral

A pair of coincident lines can generate multiple intersection
points. Path ops is more stable when the intersection T value
is used to recompute the intersection point, but this has
the side-effect of making integral edges intersect at non-integral
values.

While it's worthwhile to fix this, for the moment it is less
disruptive to only worry about keeping intersection values
integral if the original intersection point is integral in
both axes.

Also, fix some debugging code that bit-rotted.

R=​msarett@google.com

Change-Id: Iefd27b25d1d21c22b224c174bd59bc6c105033c4
Reviewed-on: https://skia-review.googlesource.com/13721
Reviewed-by: Matt Sarett <msarett@google.com>
Commit-Queue: Cary Clark <caryclark@google.com>
(cherry picked from commit 73e597d0eddeaaa466101d5bb7da537c0066166a)
Reviewed-on: https://skia-review.googlesource.com/13727
/external/skia/src/pathops/SkPathOpsDebug.cpp
59d5a0e3f560da40e0ae7036a01d7d58ce3718d8 23-Jan-2017 Cary Clark <caryclark@google.com> Revert "offset angle check edge in common"

This reverts commit d2eb581ebc8f8009e80cccccd74d5b341ef5bd5b.

Reason for revert: broke Google3 MSAN run of dm

Original change's description:
> offset angle check edge in common
>
> When curves cross, their intersection points may be nearby, but not exactly the same.
> Sort the angles formed by the crossing curves when all angles don't have the same
> origin.
>
> This sets up the framework to solve test case that currently fail (e.g., joel6) but
> does not fix all related test cases (e.g., joel9).
>
> All older existing test cases, including extended tests, pass.
>
> Rework the test framework to better report when tests expected to produce failing
> results now pass.
>
> Add new point and vector operations to support offset angles.
>
> TBR=reed@google.com
> BUG=skia:6041
>
> Change-Id: I67c651ded0a25e99ad93d55d6a35109b3ee3698e
> Reviewed-on: https://skia-review.googlesource.com/6624
> Commit-Queue: Cary Clark <caryclark@google.com>
> Reviewed-by: Cary Clark <caryclark@google.com>
>

TBR=caryclark@google.com,reviews@skia.org
# Not skipping CQ checks because original CL landed > 1 day ago.
BUG=skia:6041

Change-Id: I43db0808522ac44aceeb4f70e296167ea84a3663
Reviewed-on: https://skia-review.googlesource.com/7373
Commit-Queue: Cary Clark <caryclark@google.com>
Reviewed-by: Cary Clark <caryclark@google.com>
/external/skia/src/pathops/SkPathOpsDebug.cpp
d2eb581ebc8f8009e80cccccd74d5b341ef5bd5b 18-Jan-2017 Cary Clark <caryclark@google.com> offset angle check edge in common

When curves cross, their intersection points may be nearby, but not exactly the same.
Sort the angles formed by the crossing curves when all angles don't have the same
origin.

This sets up the framework to solve test case that currently fail (e.g., joel6) but
does not fix all related test cases (e.g., joel9).

All older existing test cases, including extended tests, pass.

Rework the test framework to better report when tests expected to produce failing
results now pass.

Add new point and vector operations to support offset angles.

TBR=reed@google.com
BUG=skia:6041

Change-Id: I67c651ded0a25e99ad93d55d6a35109b3ee3698e
Reviewed-on: https://skia-review.googlesource.com/6624
Commit-Queue: Cary Clark <caryclark@google.com>
Reviewed-by: Cary Clark <caryclark@google.com>
/external/skia/src/pathops/SkPathOpsDebug.cpp
ff11428526843d3e03feb6843bd21f2d80536415 14-Dec-2016 Cary Clark <caryclark@google.com> more simplify bugs

SkOpAngle::alignmentSameSide()
Shifting an edge to align it for angle sorting may move a compared edge to the opposite side.
For lines that are shifted, check to see if this is so.

class SkOpContourBuilder
If the path contains a pair of lines that cancel, skip them as early as possible.
While not strictly necessary, this optimization is cheap and makes debugging much easier.

SkOpEdgeBuilder::walk()
case SkPath::kCubic_Verb:
If max curvature or inflections break a cubic into pieces, make sure that the pieces are
large enough to process. If not, add the broken piece back to a neighbor.

Correct debugging that had gone stale.
Add active span debugging cache so only changes are shown.

TBR=reed@google.com
BUG=skia:6401

Change-Id: I766f77e4fb9b76537cf5464961addb103114f5db
Reviewed-on: https://skia-review.googlesource.com/5764
Reviewed-by: Cary Clark <caryclark@google.com>
Commit-Queue: Cary Clark <caryclark@google.com>
/external/skia/src/pathops/SkPathOpsDebug.cpp
918fb1fe6ff5349a2d1e5fb6872139f5fb931480 15-Nov-2016 Cary Clark <caryclark@google.com> fuzz hang fix and pathops client debugging

The ASAN fuzzer on chrome caught a hanging state.

To capture the data, allow the pathops client debugging
to run in a release build.

TBR=reed@google.com
BUG=665295

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4834

Change-Id: I6b2c2baabd63994f63aa730d2ee7828986b5ab89
Reviewed-on: https://skia-review.googlesource.com/4834
Commit-Queue: Cary Clark <caryclark@google.com>
Reviewed-by: Cary Clark <caryclark@google.com>
/external/skia/src/pathops/SkPathOpsDebug.cpp
1326068147ee60de138061a3fc1157fcfd5d017b 24-Oct-2016 caryclark <caryclark@google.com> formalize host debugging

Pathops writes files, anticipating upcoming crashes,
and verifies the results against regions.

Formalize these debugging methods so that they
are more easily triggered by hosts outside of
skia unit tests.

TBR=reed@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2441763003

Review-Url: https://codereview.chromium.org/2441763003
/external/skia/src/pathops/SkPathOpsDebug.cpp
a35ab3e6e024d0b548ded26a2e3b8ecd838ead93 20-Oct-2016 caryclark <caryclark@google.com> fix fuzzers

Many old pathops-related fuzz failures have built up while
the codebase was under a state a flux. Now that the code
is stable, address these failures.

Most of the CL plumbs the debug global state to downstream
routines so that, if the data is not trusted (ala fuzzed)
the function can safely exit without asserting.

TBR=reed@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2426173002

Review-Url: https://chromiumcodereview.appspot.com/2426173002
/external/skia/src/pathops/SkPathOpsDebug.cpp
e6522ea38fa3bcfdf2d718ea5ad898b3b3d46e00 17-Oct-2016 caryclark <caryclark@google.com> fix some fuzz

TBR=reed@google.com
BUG=654939, 655829, 656149
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2425733002

Review-Url: https://codereview.chromium.org/2425733002
/external/skia/src/pathops/SkPathOpsDebug.cpp
e47ae2998c1cf944db5743a416583dd0f042b6d9 05-Oct-2016 Cary Clark <caryclark@google.com> remove dead code

Use code coverage and a new '-c' flag to find
and remove unneeded code.

TBR=reed@google.com

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2397593002

patch from issue 2397593002 at patchset 1 (http://crrev.com/2397593002#ps1)

Change-Id: I741a82de9191146c10457d4c0b9cb9605dff2069
Reviewed-on: https://skia-review.googlesource.com/2983
Reviewed-by: Cary Clark <caryclark@google.com>
/external/skia/src/pathops/SkPathOpsDebug.cpp
ab87d7abf1df007c90bef2e916294ca325d81c81 04-Oct-2016 Cary Clark <caryclark@google.com> coin debugging runs all tests in extended

This extends path ops concidence debugging
to find unused algorithms and determine the extent
of loops.

This verifies that all 140M tests run without error
in release and debug.

TBR=reed@google.com
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2391733002

patch from issue 2391733002 at patchset 1 (http://crrev.com/2391733002#ps1)

Change-Id: I02ca29764405c5ac3e7ca3b2621fba28dbaaffc2
Reviewed-on: https://skia-review.googlesource.com/2923
Reviewed-by: Cary Clark <caryclark@google.com>
/external/skia/src/pathops/SkPathOpsDebug.cpp
6c3b9cdcb047afe963c7bcf34834ba2ecccacc33 26-Sep-2016 caryclark <caryclark@google.com> fix tiger b

The tiger tests have uncovered numerous bugs.
This CL fixes the last of them.

If a pair of curves do not intersect, but
have one or both ends very close to the opposite
curve, consider that an intersection.

TBR=reed@google.com
BUG=skia:5131
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2356363003

Review-Url: https://codereview.chromium.org/2356363003
/external/skia/src/pathops/SkPathOpsDebug.cpp
27c015dfcf4e2b8fb1abe327cc40204e2a4f452a 23-Sep-2016 caryclark <caryclark@google.com> split tight quads and conics

Tight quads and conics may nearly fold over on themselves, confusing
coincidence against other curves. Split them at their max curvature
early on to avoid complicating later logic.

TBR=reed@google.com
BUG=skia:5131
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2357353002

Review-Url: https://codereview.chromium.org/2357353002
/external/skia/src/pathops/SkPathOpsDebug.cpp
eed356d281adbf93ecbd89cb23913a7861cd8578 14-Sep-2016 caryclark <caryclark@google.com> Rewriting path writer

The path writer takes constructs the output path out of
curves that satisfy the pathop operation.

Curves contain lists of t/point pairs that may not be
comparable to each other. To match up curve ends in the
output path, look for adjacent curves to have a shared
membership rather than comparing point values.

Use path utilities to connect partial curve lists into
closed contours.

Share the angle code that determines if a curve has become
a degenerate line with the path writer.

Clean up some code on the way, and delete some unused
functions.

TBR=reed@google.com
BUG=5188
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2321973005

Review-Url: https://codereview.chromium.org/2321973005
/external/skia/src/pathops/SkPathOpsDebug.cpp
81a478ca6c36aac3e53ce0373a281ac8940f4780 09-Sep-2016 caryclark <caryclark@google.com> Skip adding coincident edges found
during curve intersection if their
ends are nearly the same.

Loosen conic/line intersection point
check.

Detect when coincident points are
unordered. This means that points
a/b/c on one curve may appear in
b/c/a order on the opposite curve.

Restructure addMissing to return
success and return if a coincidence
was added as a parameter.

With this, tiger part a works.
Tiger part b exposes bugs around
tight quads that are nearly coincident
with themselves, and are coincident
with something else.

The greedy coicident matcher
may cause the point order to be
out of sync.

Still working out what to do in
this case.

TBR=reed@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2321773002

Review-Url: https://codereview.chromium.org/2321773002
/external/skia/src/pathops/SkPathOpsDebug.cpp
8016b264ceec2b11d2acbeb77a9fbe66e48368b9 06-Sep-2016 caryclark <caryclark@google.com> interpolation of coincidence must be local to a single span

Pathops makes up intersections that it doesn't detect directly,
but do exist. For instance, if a is coincident with b, and
b is coincident with c, then for where they overlap
a is coincident with c.

The intersections are made up in different ways. In a few
places, the t values that are detected are interpolated to
guess the t values that represent invented intersections.

The interpolated t is not necessarily linear, but a linear
guess is good enough if the invented t lies between known
t values.

Additionally, improve debugging.

This passes the extended release test suite and additionally
passes the first 17 levels in the tiger test suite;
previously, path ops passed 7 levels.

The tiger suite is composed of 37 levels in increasing
complexity, described by about 300K tests.

TBR=reed@google.com
BUG=skia:5131
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2300203002

Review-Url: https://codereview.chromium.org/2300203002
/external/skia/src/pathops/SkPathOpsDebug.cpp
30b9fdd6a1d607bde20c793af65b5e2e8a1737ca 31-Aug-2016 caryclark <caryclark@google.com> pathops coincident work

This is working towards fixing all bugs around simplifying the tiger.

This installment simplifies the point-t intersection list as it is built rather than doing the analysis once the intersections are complete. This avoids getting the list in an inconsistent state and makes coincident checks faster and more stable.

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2237223002

TBR=reed@google.com
BUG=skia:5131

Review-Url: https://codereview.chromium.org/2237223002
/external/skia/src/pathops/SkPathOpsDebug.cpp
29b2563afb1677515739f1d24fb27733626eca92 25-Aug-2016 caryclark <caryclark@google.com> path ops stream-lining

The addT() function is a workhorse of pathops.
Make it simpler, removing branches and parameters.

Separate addOpp() into const and modify parts.

Add more debugging that asserts if the function
fails and the data is not extreme (e.g., fuzzer
generated).

TBR=reed@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2273293004

Review-Url: https://codereview.chromium.org/2273293004
/external/skia/src/pathops/SkPathOpsDebug.cpp
025b11ecde8733d9b3eee54e132cc50a5ce8eb78 25-Aug-2016 caryclark <caryclark@google.com> add pathops debugging

Pathops has many points of failure, most of which
are triggered by extreme data generated by fuzzers.
It's difficult to figure out which failure point
was triggered when the operation gives up.

Add instrumentation so that the failure can
be debugged when the data is well-behaved.

Also, add a check that looks for a sequence of
coincident points on multiple edges that are out
of order when compared to each other.

TBR=reed@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2274803003

Review-Url: https://codereview.chromium.org/2274803003
/external/skia/src/pathops/SkPathOpsDebug.cpp
ef4f32ac858825dc443cfe4739ea878fb0bf550f 24-Aug-2016 caryclark <caryclark@google.com> remove point aliases

This removes the notion of keeping track of every different t value
that resolves to the same or a similar point. Other fixes make
this concept unnecessary, and removing it simplifies the code.

This removes an allocation, and speeds up paths with many
overlapping curves.

As a bonus, four fuzzer tests that failed before now succeed.

TBR=reed@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2275703003

Review-Url: https://codereview.chromium.org/2275703003
/external/skia/src/pathops/SkPathOpsDebug.cpp
d6562000efca50bc2bfddae8dcb69dce6b8c0950 27-Jul-2016 caryclark <caryclark@google.com> require semi at the end of SkASSERT and friends

R=bungeman@google.com
TBR=reed@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2185063002

Review-Url: https://codereview.chromium.org/2185063002
/external/skia/src/pathops/SkPathOpsDebug.cpp
55888e44171ffd48b591d19256884a969fe4da17 18-Jul-2016 caryclark <caryclark@google.com> pathops coincidence and security rewrite

Most changes stem from working on an examples bracketed
by #if DEBUG_UNDER_DEVELOPMENT // tiger
These exposed many problems with coincident curves,
as well as errors throughout the code.

Fixing these errors also fixed a number of fuzzer-inspired
bug reports.

* Line/Curve Intersections
Check to see if the end of the line nearly intersects
the curve. This was a FIXME in the old code.

* Performance
Use a central chunk allocator.
Plumb the allocator into the global variable state
so that it can be shared. (Note that 'SkGlobalState'
is allocated on the stack and is visible to children
functions but not other threads.)

* Refactor
Let SkOpAngle grow up from a structure to a class.
Let SkCoincidentSpans grow up from a structure to a class.
Rename enum Alias to AliasMatch.

* Coincidence Rewrite
Add more debugging to coincidence detection.
Parallel debugging routines have read-only logic to report
the current coincidence state so that steps through the
logic can expose whether things got better or worse.

More functions can error-out and cause the pathops
engine to non-destructively exit.

* Accuracy
Remove code that adjusted point locations. Instead,
offset the curve part so that sorted curves all use
the same origin.
Reduce the size (and influence) of magic numbers.

* Testing
The debug suite with verify and the full release suite
./out/Debug/pathops_unittest -v -V
./out/Release/pathops_unittest -v -V -x
expose one error. That error is captured as cubics_d3.
This error exists in the checked in code as well.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2128633003

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2128633003

Review-Url: https://codereview.chromium.org/2128633003
/external/skia/src/pathops/SkPathOpsDebug.cpp
086eea93b1f8253420c233c33cdabc0e74b08091 05-May-2016 reed <reed@google.com> Revert of SK_DECLARE_STATIC_MUTEX -> static SkMutex (patchset #1 id:1 of https://codereview.chromium.org/1948193002/ )

Reason for revert:
broken the Mac and Linux builders, e.g.:

https://build.chromium.org/p/chromium/builders/Mac/builds/15151
https://build.chromium.org/p/chromium/builders/Linux%20x64/builds/19052

Original issue's description:
> SK_DECLARE_STATIC_MUTEX -> static SkMutex
>
> There's no need to use a macro to declare static SkMutexes any more
> (and there's likewise no need to restrict them to global scope).
>
> BUG=skia:
> GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1948193002
>
> Committed: https://skia.googlesource.com/skia/+/5e56cfd3fa1041dbb83899844fb92fa9a2ef1009

TBR=mtklein@google.com,mtklein@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review-Url: https://codereview.chromium.org/1945353003
/external/skia/src/pathops/SkPathOpsDebug.cpp
5e56cfd3fa1041dbb83899844fb92fa9a2ef1009 05-May-2016 mtklein <mtklein@chromium.org> SK_DECLARE_STATIC_MUTEX -> static SkMutex

There's no need to use a macro to declare static SkMutexes any more
(and there's likewise no need to restrict them to global scope).

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1948193002

Review-Url: https://codereview.chromium.org/1948193002
/external/skia/src/pathops/SkPathOpsDebug.cpp
f2b340fc885ad2a12d2d73974eff9c8f4c94192c 29-Jan-2016 djsollen <djsollen@google.com> Consolidate SK_CRASH and sk_throw into SK_ABORT

TBR=reed@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1648343003

Review URL: https://codereview.chromium.org/1648343003
/external/skia/src/pathops/SkPathOpsDebug.cpp
aa97a84404c7505738713a4c19b42347c7daef9e 22-Jan-2016 djsollen <djsollen@google.com> Revert of Consolidate SK_CRASH and sk_throw into SK_ABORT (patchset #5 id:80001 of https://codereview.chromium.org/1610823002/ )

Reason for revert:
Chrome is calling SK_CRASH

Original issue's description:
> Consolidate SK_CRASH and sk_throw into SK_ABORT
> GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1610823002
>
> Committed: https://skia.googlesource.com/skia/+/4c5cd7d527ed29aabfa72aa47b23a4496eeda357

TBR=reed@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1620333002
/external/skia/src/pathops/SkPathOpsDebug.cpp
4c5cd7d527ed29aabfa72aa47b23a4496eeda357 22-Jan-2016 djsollen <djsollen@google.com> Consolidate SK_CRASH and sk_throw into SK_ABORT
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1610823002

Review URL: https://codereview.chromium.org/1610823002
/external/skia/src/pathops/SkPathOpsDebug.cpp
ed0935a28a29af7d3b16ac8d9365f291a335c6bd 22-Oct-2015 caryclark <caryclark@google.com> Reland of path ops: fix conic weight and partial coincidence (patchset #1 id:1 of https://codereview.chromium.org/1408923003/ )

Reason for revert:
suppressions have landed in chrome

Original issue's description:
> Revert of path ops: fix conic weight and partial coincidence (patchset #5 id:80001 of https://codereview.chromium.org/1413763002/ )
>
> Reason for revert:
> path ops change breaks svg clipping layout tests -- conic is now more accurate, changing edge of circle in clip
>
> These need to be rebaselined
>
> svg/clip-path/clip-path-child-clipped.svg
> svg/clip-path/clip-path-nonzero.svg
> svg/clip-path/clip-path-evenodd-nonzero.svg
> svg/clip-path/clip-path-nonzero-evenodd.svg
>
> Original issue's description:
> > The remaining 1m skp bugs are asserts that can be harmlessly
> > suppressed and bugs around conics.
> >
> > The conic calculation for a subdivided w was just wrong.
> >
> > Also added debugging to template intersection to initialize
> > reused structures and dump additional data.
> >
> > TBR=reed@google.com
> >
> > Committed: https://skia.googlesource.com/skia/+/ef33b1e739b23a1201100ff17a572da85b03d9af
>
> TBR=
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
>
> Committed: https://skia.googlesource.com/skia/+/f428df1be3e96d3f8970d0f7f415b862f7da5404

TBR=
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1407003016
/external/skia/src/pathops/SkPathOpsDebug.cpp
f428df1be3e96d3f8970d0f7f415b862f7da5404 21-Oct-2015 caryclark <caryclark@google.com> Revert of path ops: fix conic weight and partial coincidence (patchset #5 id:80001 of https://codereview.chromium.org/1413763002/ )

Reason for revert:
path ops change breaks svg clipping layout tests -- conic is now more accurate, changing edge of circle in clip

These need to be rebaselined

svg/clip-path/clip-path-child-clipped.svg
svg/clip-path/clip-path-nonzero.svg
svg/clip-path/clip-path-evenodd-nonzero.svg
svg/clip-path/clip-path-nonzero-evenodd.svg

Original issue's description:
> The remaining 1m skp bugs are asserts that can be harmlessly
> suppressed and bugs around conics.
>
> The conic calculation for a subdivided w was just wrong.
>
> Also added debugging to template intersection to initialize
> reused structures and dump additional data.
>
> TBR=reed@google.com
>
> Committed: https://skia.googlesource.com/skia/+/ef33b1e739b23a1201100ff17a572da85b03d9af

TBR=
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1408923003
/external/skia/src/pathops/SkPathOpsDebug.cpp
ef33b1e739b23a1201100ff17a572da85b03d9af 20-Oct-2015 caryclark <caryclark@google.com> The remaining 1m skp bugs are asserts that can be harmlessly
suppressed and bugs around conics.

The conic calculation for a subdivided w was just wrong.

Also added debugging to template intersection to initialize
reused structures and dump additional data.

TBR=reed@google.com

Review URL: https://codereview.chromium.org/1413763002
/external/skia/src/pathops/SkPathOpsDebug.cpp
26ad22ab61539e3d3b6bc5e0da8dcebbd52a53de 16-Oct-2015 caryclark <caryclark@google.com> Enabling clip stack flattening exercises path ops.
Iterating through the 903K skps that represent the
imagable 1M top web pages triggers a number of
bugs, some of which are addressed here.

Some web pages trigger intersecting cubic
representations of arc with their conic
counterparts. This exposed a flaw in coincident
detection that caused an infinite loop. The loop
alternatively extended the coincident section and,
determining the that the bounds of the curve pairs
did not overlap, deleted the extension.

Track the number of times the coincident detection
is called, and if it exceeds an empirically found
limit, assume that the curves are coincident and
force it to be so.

The loop count limit can be determined by enabling
DEBUG_T_SECT_LOOP_COUNT and running all tests. The
largest count is reported on completion.

Another class of bugs was caused by concident
detection duplicating nearly identical points that
had been merged earlier. To track these bugs, the
'handle coincidence' code was duplicated as a
const debug variety that reported if one of a
dozen or so irregularities are present; then it is
easier to see when a block of code that fixes one
irregularity regresses another.

Creating the debug const code version exposed some
non-debug code that could be const, and some that
was experimental and could be removed. Set
DEBUG_COINCIDENCE to track coincidence health and
handling.

For running on Chrome, DEBUG_VERIFY checks the
result of pathops against the same operation
using SkRegion to verify that the results are
nearly the same.

When visualizing the pathops work using
tools/pathops_visualizer.htm, set
DEBUG_DUMP_ALIGNMENT to see the curves after
they've been aligned for coincidence.

Other bugs fixed include detecting when a
section of a pair of curves have devolved into
lines and are coincident.

TBR=reed@google.com

Review URL: https://codereview.chromium.org/1394503003
/external/skia/src/pathops/SkPathOpsDebug.cpp
96fcdcc219d2a0d3579719b84b28bede76efba64 27-Aug-2015 halcanary <halcanary@google.com> Style Change: NULL->nullptr
DOCS_PREVIEW= https://skia.org/?cl=1316233002

Review URL: https://codereview.chromium.org/1316233002
/external/skia/src/pathops/SkPathOpsDebug.cpp
385fe4d4b62d7d1dd76116dd570df3290a2f487b 26-Aug-2015 halcanary <halcanary@google.com> Style Change: SkNEW->new; SkDELETE->delete
DOCS_PREVIEW= https://skia.org/?cl=1316123003

Review URL: https://codereview.chromium.org/1316123003
/external/skia/src/pathops/SkPathOpsDebug.cpp
1b24933e52f50773de29332387a12721811f3012 07-Jul-2015 mtklein <mtklein@chromium.org> Remove SkThread.h, include SkMutex.h or SkAtomics.h as appropriate.

SkThread.h doesn't do anything anymore execept include those two,
and thankfully, it doesn't seem to be mentioned outside Skia.

No public API changes.
TBR=reed@google.com

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/c50acf2321d7a934c80d754e9cbe936dfb8eb4cc

Review URL: https://codereview.chromium.org/1215393002
/external/skia/src/pathops/SkPathOpsDebug.cpp
27c8eb8ffd7e221693d840c2b9279d53fe6f03d4 06-Jul-2015 caryclark <caryclark@google.com> When three or more edges are coincident, the logic needs
to compute the overlapping ranges and combine the winding
into a single destination.

This computes coincidence more rigorously, fixing the
edge cases exposed by this bug.

Also, add the ability to debug and dump pathop structures
from the coincident context.

TBR=reed@google.com
BUG=skia:3651

Review URL: https://codereview.chromium.org/1182493015
/external/skia/src/pathops/SkPathOpsDebug.cpp
02802f64ea0b1fc9223386328a95280b74092c94 02-Jul-2015 jvanverth <jvanverth@google.com> Revert of Remove SkThread.h, include SkMutex.h or SkAtomics.h as appropriate. (patchset #4 id:60001 of https://codereview.chromium.org/1215393002/)

Reason for revert:
Breaking the roll.

E.g. on android_chromium_gn_compile_dbg:

FAILED: /b/build/goma/gomacc ../../third_party/android_tools/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-g++ -MMD -MF obj/skia/ext/libskia.SkMemory_new_handler.o.d -DV8_DEPRECATION_WARNINGS -DCLD_VERSION=1 -DENABLE_NOTIFICATIONS -DENABLE_BROWSER_CDMS -DENABLE_PRINTING=1 -DENABLE_BASIC_PRINTING=1 -DDONT_EMBED_BUILD_METADATA -DUSE_OPENSSL=1 -DUSE_OPENSSL_CERTS=1 -DNO_TCMALLOC -DDISABLE_NACL -DENABLE_CONFIGURATION_POLICY -DENABLE_SUPERVISED_USERS=1 -DENABLE_AUTOFILL_DIALOG=1 -DUSE_PROPRIETARY_CODECS -DV8_USE_EXTERNAL_STARTUP_DATA -DVIDEO_HOLE=1 -DMOBILE_SAFE_BROWSING -DSAFE_BROWSING_SERVICE -DCHROMIUM_BUILD -D_FILE_OFFSET_BITS=64 -DANDROID -DHAVE_SYS_UIO_H -DCOMPONENT_BUILD -D__GNU_SOURCE=1 -D_DEBUG -DDYNAMIC_ANNOTATIONS_ENABLED=1 -DWTF_USE_DYNAMIC_ANNOTATIONS=1 -DSKIA_IMPLEMENTATION=1 -DSK_ARM_HAS_OPTIONAL_NEON -DSK_GAMMA_APPLY_TO_A8 -DSK_GAMMA_EXPONENT=1.4 -DSK_GAMMA_CONTRAST=0.0 -DSK_DEFAULT_FONT_CACHE_LIMIT=1048576 -DSK_IGNORE_LINEONLY_AA_CONVEX_PATH_OPTS -DSKIA_DLL -DGR_GL_IGNORE_ES3_MSAA=0 -DSK_SUPPORT_GPU=1 -DSK_BUILD_FOR_ANDROID -DUSE_CHROMIUM_SKIA -DXML_STATIC -I../.. -Igen -I../../third_party/skia/include/private -I../../third_party/skia/src/core -I../../third_party/skia/src/image -I../../third_party/skia/src/opts -I../../third_party/skia/src/pdf -I../../third_party/skia/src/ports -I../../third_party/skia/src/sfnt -I../../third_party/skia/src/utils -I../../third_party/skia/src/lazy -I../../skia/config -I../../skia/ext -I../../third_party/skia/include/c -I../../third_party/skia/include/config -I../../third_party/skia/include/core -I../../third_party/skia/include/effects -I../../third_party/skia/include/images -I../../third_party/skia/include/lazy -I../../third_party/skia/include/pathops -I../../third_party/skia/include/pdf -I../../third_party/skia/include/pipe -I../../third_party/skia/include/ports -I../../third_party/skia/include/utils -I../../third_party/skia/include/gpu -I../../third_party/skia/src/gpu -I../../third_party/zlib -I../../third_party/expat/files/lib -I../../third_party/freetype-android/include -I../../third_party/freetype-android/src/include -I../../third_party/android_tools/ndk/sources/android/cpufeatures -fno-strict-aliasing -march=armv7-a -mfloat-abi=softfp -mtune=generic-armv7-a -mthumb -mthumb-interwork -fno-tree-sra -fno-caller-saves -funwind-tables -fPIC -pipe -ffunction-sections -funwind-tables -fno-short-enums -finline-limit=64 -mfpu=vfpv3-d16 -isystem../../third_party/android_tools/ndk/sources/cxx-stl/llvm-libc++/libcxx/include -isystem../../third_party/android_tools/ndk/sources/cxx-stl/llvm-libc++abi/libcxxabi/include -isystem../../third_party/android_tools/ndk/sources/android/support/include -fvisibility=hidden --sysroot=/b/build/slave/android_chromium_gn/build/src/third_party/android_tools/ndk/platforms/android-16/arch-arm -Os -fdata-sections -ffunction-sections -fomit-frame-pointer -g1 -Wno-format -Wendif-labels -Werror -Wno-missing-field-initializers -Wno-unused-parameter -Wno-psabi -Wno-extra -Wno-ignored-qualifiers -Wno-type-limits -Wno-unused-local-typedefs -fno-threadsafe-statics -fvisibility-inlines-hidden -std=gnu++11 -fno-rtti -fno-exceptions -Wno-deprecated -Wno-narrowing -Wno-literal-suffix -Wno-error=c++0x-compat -Wno-non-virtual-dtor -Wno-sign-promo -c ../../skia/ext/SkMemory_new_handler.cpp -o obj/skia/ext/libskia.SkMemory_new_handler.o
../../skia/ext/SkMemory_new_handler.cpp:12:52: fatal error: third_party/skia/include/core/SkThread.h: No such file or directory
#include "third_party/skia/include/core/SkThread.h"

Original issue's description:
> Remove SkThread.h, include SkMutex.h or SkAtomics.h as appropriate.
>
> SkThread.h doesn't do anything anymore execept include those two,
> and thankfully, it doesn't seem to be mentioned outside Skia.
>
> No public API changes.
> TBR=reed@google.com
>
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/c50acf2321d7a934c80d754e9cbe936dfb8eb4cc

TBR=mtklein@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/1214603003
/external/skia/src/pathops/SkPathOpsDebug.cpp
c50acf2321d7a934c80d754e9cbe936dfb8eb4cc 01-Jul-2015 mtklein <mtklein@chromium.org> Remove SkThread.h, include SkMutex.h or SkAtomics.h as appropriate.

SkThread.h doesn't do anything anymore execept include those two,
and thankfully, it doesn't seem to be mentioned outside Skia.

No public API changes.
TBR=reed@google.com

BUG=skia:

Review URL: https://codereview.chromium.org/1215393002
/external/skia/src/pathops/SkPathOpsDebug.cpp
4e1a4c9399b8bb0897218f3ec10c254d3bb97463 18-May-2015 caryclark <caryclark@google.com> fix builder winding again

Record the nesting level when finding the edge winding contribution
so that inner edges can be reversed as needed.

R=fmalita@chromium.org
BUG=skia:3838

Review URL: https://codereview.chromium.org/1140383002
/external/skia/src/pathops/SkPathOpsDebug.cpp
182b499cd75c971f85cdf52c1827b3c220cc9011 14-May-2015 caryclark <caryclark@google.com> look for deleted pts when detecting line/curve coincident edges

TBR=reed@google.com
BUG=skia:3651

Review URL: https://codereview.chromium.org/1129863007
/external/skia/src/pathops/SkPathOpsDebug.cpp
624637cc8ec22c000409704d0b403ac1b81ad4b0 11-May-2015 caryclark <caryclark@google.com> Path ops formerly found the topmost unprocessed edge and determined its angle sort order to initialize the winding. This never worked correctly with cubics and was flaky with paths consisting mostly of vertical edges.

This replacement shoots axis-aligned rays through all intersecting edges to find the outermost one either horizontally or vertically. The resulting code is smaller and twice as fast.

To support this, most of the horizontal / vertical intersection code was rewritten and standardized, and old code supporting the top-directed winding was deleted.

Contours were pointed to by an SkTDArray. Instead, put them in a linked list, and designate the list head with its own class to ensure that methods that take lists of contours start at the top. This change removed a large percentage of memory allocations used by path ops.

TBR=reed@google.com
BUG=skia:3588

Review URL: https://codereview.chromium.org/1111333002
/external/skia/src/pathops/SkPathOpsDebug.cpp
08bc8488fa2ea2d2a17efb1443f0ec6579d5a3c8 24-Apr-2015 caryclark <caryclark@google.com> fix multiple intersection logic

When three or more curves intersect at the same point, ensure that
each curve records the intersections of the others. This fixes a
number of cubic tests.

TBR=reed@google.com
BUG=skia:3588

Review URL: https://codereview.chromium.org/1105943002
/external/skia/src/pathops/SkPathOpsDebug.cpp
03b03cad01628146bbb8d4f33c073bd0c77ee558 23-Apr-2015 caryclark <caryclark@google.com> working on initial winding for cubics

Path ops works well for all tests except for cubics.
Isolate failures caused by cubics, and do a better job of computing
the initial winding for cubics.

TBR=reed@google.com
BUG=skia:3588

Review URL: https://codereview.chromium.org/1096923003
/external/skia/src/pathops/SkPathOpsDebug.cpp
1049f1246e7be4ccb68001361efceb8933e6f81c 20-Apr-2015 caryclark <caryclark@google.com> Now, path ops natively intersect conics, quads, and cubics in any combination. There are still a class of cubic tests that fail and a handful of undiagnosed failures from skps and fuzz tests, but things are much better overall.

Extended tests (150M+) run to completion in release in about 6 minutes; the standard test suite exceeds 100K and finishes in a few seconds on desktops.

TBR=reed
BUG=skia:3588

Review URL: https://codereview.chromium.org/1037953004
/external/skia/src/pathops/SkPathOpsDebug.cpp
54359294a7c9dc54802d512a5d891a35c1663392 26-Mar-2015 caryclark <caryclark@google.com> cumulative pathops patch

Replace the implicit curve intersection with a geometric curve intersection. The implicit intersection proved mathematically unstable and took a long time to zero in on an answer.

Use pointers instead of indices to refer to parts of curves. Indices required awkward renumbering.

Unify t and point values so that small intervals can be eliminated in one pass.

Break cubics up front to eliminate loops and cusps.

Make the Simplify and Op code more regular and eliminate arbitrary differences.

Add a builder that takes an array of paths and operators.

Delete unused code.

BUG=skia:3588
R=reed@google.com

Review URL: https://codereview.chromium.org/1037573004
/external/skia/src/pathops/SkPathOpsDebug.cpp
0dc4dd6dda9a7912f696b46d9c02155ec1d1ba5f 24-Mar-2015 reed <reed@google.com> Revert of pathops version two (patchset #16 id:150001 of https://codereview.chromium.org/1002693002/)

Reason for revert:
ASAN investigation

Original issue's description:
> pathops version two
>
> R=reed@google.com
>
> marked 'no commit' to attempt to get trybots to run
>
> TBR=reed@google.com
>
> Committed: https://skia.googlesource.com/skia/+/ccec0f958ffc71a9986d236bc2eb335cb2111119

TBR=caryclark@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1029993002
/external/skia/src/pathops/SkPathOpsDebug.cpp
ccec0f958ffc71a9986d236bc2eb335cb2111119 24-Mar-2015 caryclark <caryclark@google.com> pathops version two

R=reed@google.com

marked 'no commit' to attempt to get trybots to run

TBR=reed@google.com

Review URL: https://codereview.chromium.org/1002693002
/external/skia/src/pathops/SkPathOpsDebug.cpp
19eb3b2f0aa6dce5c0335230a8930e90733e5d5d 18-Jul-2014 caryclark <caryclark@google.com> update pathops core and tests

split out skpclip (the test of 1M pictures) into its own project

TBR=reed

Author: caryclark@google.com

Review URL: https://codereview.chromium.org/400033002
/external/skia/src/pathops/SkPathOpsDebug.cpp
e4097e3a0b10bb0047a45b6949ca01826f0807a7 18-Jun-2014 caryclark <caryclark@google.com> Fix last pathops skp bug

This fixes the last bug discovered by iterating through the 800K
skp corpus representing the top 1M websites. For every clip on the
stack, the paths are replaced with the pathop intersection. The
resulting draw is compared with the original draw for pixel errors.

At least two prominent bugs remain. In one, the winding value is
confused by a cubic with an inflection. In the other, a quad/cubic
pair, nearly coincident, fails to find an intersection.

These minor changes include ignoring very tiny self-intersections
of cubics, and processing degenerate edges that don't connect to
anything else.

R=reed@android.com
TBR=reed

Author: caryclark@google.com

Review URL: https://codereview.chromium.org/340103002
/external/skia/src/pathops/SkPathOpsDebug.cpp
dac1d17027dcaa5596885a9f333979418b35001c 17-Jun-2014 caryclark <caryclark@google.com> Enabling the canvas bit to turn the clip stack into a flat replace exposed around 100 failures when testing the 800K skp set generated from the top 1M web sites.

This fixes all but one of those failures.

Major changes include:
- Replace angle indices with angle pointers. This was motivated by the need to add angles later but not renumber existing angles.
- Aggressive segment chase. When the winding is known on a segment, more aggressively passing that winding to adjacent segments allows fragmented data sets to succeed.
- Line segments with ends nearly the same are treated as coincident first.
- Transfer partial coincidence by observing that if segment A is partially coincident to B and C then B and C may be partially coincident.

TBR=reed

Author: caryclark@google.com

Review URL: https://codereview.chromium.org/272153002
/external/skia/src/pathops/SkPathOpsDebug.cpp
45d1d1d9a71253e0ed28ba87f5f946b5845f1d6d 30-Apr-2014 commit-bot@chromium.org <commit-bot@chromium.org@2bbb7eff-a529-9590-31e7-b0007b416f81> Rename SK_DEBUGBREAK to SK_ALWAYSBREAK

Committed: http://code.google.com/p/skia/source/detail?r=14473

R=caryclark@google.com, reed@google.com

Author: bsalomon@google.com

Review URL: https://codereview.chromium.org/263553012

git-svn-id: http://skia.googlecode.com/svn/trunk@14481 2bbb7eff-a529-9590-31e7-b0007b416f81
/external/skia/src/pathops/SkPathOpsDebug.cpp
62cf26f374975d55cb771cb3b6b482c9f222d1eb 30-Apr-2014 commit-bot@chromium.org <commit-bot@chromium.org@2bbb7eff-a529-9590-31e7-b0007b416f81> Revert of Rename SK_DEBUGBREAK to SK_ALWAYSBREAK (https://codereview.chromium.org/263553012/)

Reason for revert:
Broke windows bot

Original issue's description:
> Rename SK_DEBUGBREAK to SK_ALWAYSBREAK
>
> Committed: http://code.google.com/p/skia/source/detail?r=14473

R=caryclark@google.com, reed@google.com
TBR=caryclark@google.com, reed@google.com
NOTREECHECKS=true
NOTRY=true

Author: bsalomon@google.com

Review URL: https://codereview.chromium.org/260763003

git-svn-id: http://skia.googlecode.com/svn/trunk@14476 2bbb7eff-a529-9590-31e7-b0007b416f81
/external/skia/src/pathops/SkPathOpsDebug.cpp
f0eeb7d67849cef7e0a85f6636588800b9fa97e3 30-Apr-2014 commit-bot@chromium.org <commit-bot@chromium.org@2bbb7eff-a529-9590-31e7-b0007b416f81> Rename SK_DEBUGBREAK to SK_ALWAYSBREAK

R=caryclark@google.com, reed@google.com

Author: bsalomon@google.com

Review URL: https://codereview.chromium.org/263553012

git-svn-id: http://skia.googlecode.com/svn/trunk@14473 2bbb7eff-a529-9590-31e7-b0007b416f81
/external/skia/src/pathops/SkPathOpsDebug.cpp
fe41b8ffff3463a1b062c4fd7315b44e278ba390 25-Apr-2014 commit-bot@chromium.org <commit-bot@chromium.org@2bbb7eff-a529-9590-31e7-b0007b416f81> one more tsan fix

BUG=skia:2460
R=mtklein@google.com
TBR=mtklein

Author: caryclark@google.com

Review URL: https://codereview.chromium.org/255893002

git-svn-id: http://skia.googlecode.com/svn/trunk@14382 2bbb7eff-a529-9590-31e7-b0007b416f81
/external/skia/src/pathops/SkPathOpsDebug.cpp
8cb1daaa1e4343eb60a7c4f21c12e33de30dad64 25-Apr-2014 commit-bot@chromium.org <commit-bot@chromium.org@2bbb7eff-a529-9590-31e7-b0007b416f81> fix minor skp-found bugs

remove globals from pathops_unittest

BUG=skia:2460
TBR=mtklein

Author: caryclark@google.com

Review URL: https://codereview.chromium.org/239563004

git-svn-id: http://skia.googlecode.com/svn/trunk@14378 2bbb7eff-a529-9590-31e7-b0007b416f81
/external/skia/src/pathops/SkPathOpsDebug.cpp
4431e7757cfcb8cfa99535eed0e9f156dabf95c2 14-Apr-2014 commit-bot@chromium.org <commit-bot@chromium.org@2bbb7eff-a529-9590-31e7-b0007b416f81> Mike R: please sanity check SkPostConfig.h
Mike K: please sanity check Test.cpp and skia_test.cpp

Feel free to look at the rest, but I don't expect any in depth review of path ops innards.

Path Ops first iteration used QuickSort to order segments radiating from an intersection to compute the winding rule.

This revision uses a circular sort instead. Breaking out the circular sort into its own long-lived structure (SkOpAngle) allows doing less work and provides a home for caching additional sorting data.

The circle sort is more stable than the former sort, has a robust ordering and fewer exceptions. It finds unsortable ordering less often. It is less reliant on the initial curve tangent, using convex hulls instead whenever it can.

Additional debug validation makes sure that the computed structures are self-consistent. A new visualization tool helps verify that the angle ordering is correct.

The 70+M tests pass with this change on Windows, Mac, Linux 32 and Linux 64 in debug and release.

R=mtklein@google.com, reed@google.com

Author: caryclark@google.com

Review URL: https://codereview.chromium.org/131103009

git-svn-id: http://skia.googlecode.com/svn/trunk@14183 2bbb7eff-a529-9590-31e7-b0007b416f81
/external/skia/src/pathops/SkPathOpsDebug.cpp
866f4e34a943c115ac372c22123a1520aa5f9b06 21-Nov-2013 commit-bot@chromium.org <commit-bot@chromium.org@2bbb7eff-a529-9590-31e7-b0007b416f81> optimize pathops coverage

Remove unused code from SkOpSegment.cpp and friends.
Add new tests exposed by coverage.
Fix a bug exposed by coverage -- removing the need to detect points that are nearby when intersecting.
Add gyp rule for building coverage flavor on Mac.

R=mtklein@google.com

Author: caryclark@google.com

Review URL: https://codereview.chromium.org/75453003

git-svn-id: http://skia.googlecode.com/svn/trunk@12344 2bbb7eff-a529-9590-31e7-b0007b416f81
/external/skia/src/pathops/SkPathOpsDebug.cpp
a2bbc6e19d5332e81784e582c290cc060f40c4c7 01-Nov-2013 caryclark@google.com <caryclark@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81> pathops work in progress

BUG=

Review URL: https://codereview.chromium.org/52653002

git-svn-id: http://skia.googlecode.com/svn/trunk@12089 2bbb7eff-a529-9590-31e7-b0007b416f81
/external/skia/src/pathops/SkPathOpsDebug.cpp
b0a0589f8ac0254ec1beba9db2fc32a2bedb31e5 03-Oct-2013 skia.committer@gmail.com <skia.committer@gmail.com@2bbb7eff-a529-9590-31e7-b0007b416f81> Sanitizing source files in Housekeeper-Nightly

git-svn-id: http://skia.googlecode.com/svn/trunk@11585 2bbb7eff-a529-9590-31e7-b0007b416f81
/external/skia/src/pathops/SkPathOpsDebug.cpp
7eaa53d8f7e48fd17d02b5e3bd91f90e9c1899ef 02-Oct-2013 caryclark@google.com <caryclark@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81> path ops work in progress

make more skps work

remove edit files

BUG=

Review URL: https://codereview.chromium.org/23542056

git-svn-id: http://skia.googlecode.com/svn/trunk@11570 2bbb7eff-a529-9590-31e7-b0007b416f81
/external/skia/src/pathops/SkPathOpsDebug.cpp
570863f2e22b8ea7d7c504bd15e4f766af097df2 16-Sep-2013 caryclark@google.com <caryclark@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81> path ops work in progress

path ops work in progress

BUG=

Review URL: https://codereview.chromium.org/21359002

git-svn-id: http://skia.googlecode.com/svn/trunk@11291 2bbb7eff-a529-9590-31e7-b0007b416f81
/external/skia/src/pathops/SkPathOpsDebug.cpp
a4aced47281e085201a356ce888b92138846e9f6 09-Jul-2013 skia.committer@gmail.com <skia.committer@gmail.com@2bbb7eff-a529-9590-31e7-b0007b416f81> Sanitizing source files in Housekeeper-Nightly

git-svn-id: http://skia.googlecode.com/svn/trunk@9919 2bbb7eff-a529-9590-31e7-b0007b416f81
/external/skia/src/pathops/SkPathOpsDebug.cpp
07e97fccd2d85076cd22ef411b0773ab92a18abe 08-Jul-2013 caryclark@google.com <caryclark@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81> path ops work in progress

BUG=

Review URL: https://codereview.chromium.org/18058007

git-svn-id: http://skia.googlecode.com/svn/trunk@9908 2bbb7eff-a529-9590-31e7-b0007b416f81
/external/skia/src/pathops/SkPathOpsDebug.cpp
cffbcc3b9665f2c928544b6fc6b8a0e22a4210fb 04-Jun-2013 caryclark@google.com <caryclark@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81> path ops -- rewrite angle sort

This is a major change resulting from a minor
tweak. In the old code, the intersection point
of two curves was shared between them, but the
intersection points and end points of sorted edges was
computed directly from the intersection T value.

In this CL, both intersection points and sorted points
are the same, and intermediate control points are computed
to preserve their slope.

The sort itself has been completely rewritten to be more
robust and remove 'magic' checks, conditions that empirically
worked but couldn't be rationalized.

This CL was triggered by errors generated computing the clips
of SKP files. At this point, all 73M standard tests work and
at least the first troublesome SKPs work.

Review URL: https://codereview.chromium.org/15338003

git-svn-id: http://skia.googlecode.com/svn/trunk@9432 2bbb7eff-a529-9590-31e7-b0007b416f81
/external/skia/src/pathops/SkPathOpsDebug.cpp
a5e55925ea03e76885804bda77408a1d6f04c335 07-May-2013 caryclark@google.com <caryclark@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81> path ops -- fix skp bugs

This fixes a series of bugs discovered by running
the small set of Skia skp files through pathops
to flatten the clips.
Review URL: https://codereview.chromium.org/14798004

git-svn-id: http://skia.googlecode.com/svn/trunk@9042 2bbb7eff-a529-9590-31e7-b0007b416f81
/external/skia/src/pathops/SkPathOpsDebug.cpp
0361032c0b53401030a720bc8b4930c3ec59f19e 18-Apr-2013 caryclark@google.com <caryclark@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81> path ops work in progress

fix bugs in tests on 32 bit release

Most changes revolve around pinning computed t values
very close to zero and one.

git-svn-id: http://skia.googlecode.com/svn/trunk@8745 2bbb7eff-a529-9590-31e7-b0007b416f81
/external/skia/src/pathops/SkPathOpsDebug.cpp
07393cab57ce74a4aae89a31fae9aaa9780fc19d 08-Apr-2013 caryclark@google.com <caryclark@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81> Add base types for path ops

Paths contain lines, quads, and cubics, which are
collectively curves.

To work with path intersections, intermediary curves
are constructed. For now, those intermediates use
doubles to guarantee sufficient precision.

The DVector, DPoint, DLine, DQuad, and DCubic
structs encapsulate these intermediate curves.

The DRect and DTriangle structs are created to
describe intersectable areas of interest.

The Bounds struct inherits from SkRect to create
a SkScalar-based rectangle that intersects shared
edges.

This also includes common math equalities and
debugging that the remainder of path ops builds on,
as well as a temporary top-level interface in
include/pathops/SkPathOps.h.
Review URL: https://codereview.chromium.org/12827020

git-svn-id: http://skia.googlecode.com/svn/trunk@8551 2bbb7eff-a529-9590-31e7-b0007b416f81
/external/skia/src/pathops/SkPathOpsDebug.cpp