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path: root/src/pathops/SkPathOpsSimplify.cpp
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* More conic-specific tests revealed a few conic-specific bugs. Because ↵Gravatar caryclark2015-10-30
| | | | | | | | | | | | | | | | | | | | | | | | javascript / canvas make visualizing conics tricky, new native tools are required. The utility SubsetPath removes parts of a potentially very large path to isolate a minimal test case. SubsetPath is very useful for debugging path ops, but is not path ops specific. PathOpsBuilderConicTest compares the output of the Path Ops Builder, sequential calls to Simplify, and SkRegions for some number of rotated ovals. Some tests caused path ops to hang. It was caught adding a loop of curves because the head was not found by the tail. Even though the root cause has been fixed, SkSegment::addCurveTo callers now abort the path op if the same curve was added twice. The subdivided conic weight was been computed anew. Fortunately, it's a simpler computation that the one it replaces. Some Simplify() subroutines returned false to signal that the results needed assembling. Change these to abort the current operation instead. Coincident curve intersection triggered two small bugs; one where no perpendicular could be found for coincident curves, and one where no coincident curves remain after looping. The SixtyOvals test can be run through multiple processes instead of multiple threads. This strategy allows a 48 core machine to saturate all cores at 100%. The DEBUG_VISUALIZE_CONICS code in PathOpsConicIntersectionTest acknowleges that it is easier to visualize conics with Skia than with script and html canvas. This test also verifies that path ops subdivision matches geometry chopping. TBR=reed@google.com Review URL: https://codereview.chromium.org/1405383004
* Enabling clip stack flattening exercises path ops.Gravatar caryclark2015-10-16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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
* Style Change: NULL->nullptrGravatar halcanary2015-08-27
| | | | | | DOCS_PREVIEW= https://skia.org/?cl=1316233002 Review URL: https://codereview.chromium.org/1316233002
* fix path ops fuzz busterGravatar caryclark2015-07-23
| | | | | | | | | | | | Mark collapsed segments as done and remove collapsed segment references from the coincidence array. Also add test names to global debugging. R=fmalita@chromium.org BUG=512592 Review URL: https://codereview.chromium.org/1250293002
* The path ops builder code needs to determine the winding of each contour ↵Gravatar caryclark2015-05-18
| | | | | | | | | | | | | | added, and reverse windings if the contours are nested in other contours. Cheap (one contour) paths can be evaluated and reversed as needed with a minimum of checking, but multi-contour paths invoke the regular path ops machinery to determine who is contained by whom. More tests need to be added to verify that all corner cases are considered, but this fixes the cases in the bug thus far. R=fmalita@chromium.org TBR=reed@google.com BUG=skia:3838 Review URL: https://codereview.chromium.org/1129193006
* Path ops formerly found the topmost unprocessed edge and determined its ↵Gravatar caryclark2015-05-11
| | | | | | | | | | | | | | | 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
* minor fixes to cubics code and overall alignment of how bounds and tops are ↵Gravatar caryclark2015-04-29
| | | | | | | | | | | | computed for all curve types All but 17 extended tests work. A helper function is privately added to SkPath.h to permit a test to modify a given point in a path. BUG=skia:3588 Review URL: https://codereview.chromium.org/1107353004
* fix valgrindGravatar caryclark2015-04-27
| | | | | | | TBR=mtklein@google.com BUG=skia: Review URL: https://codereview.chromium.org/1102273003
* working on initial winding for cubicsGravatar caryclark2015-04-23
| | | | | | | | | | | 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
* Now, path ops natively intersect conics, quads, and cubics in any ↵Gravatar caryclark2015-04-20
| | | | | | | | | | | 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
* cumulative pathops patchGravatar caryclark2015-03-26
| | | | | | | | | | | | | | | | | | | | | 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
* Revert of pathops version two (patchset #16 id:150001 of ↵Gravatar reed2015-03-24
| | | | | | | | | | | | | | | | | | | | | | | | | 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
* Revert of fix destructor order to fix build (patchset #1 id:1 of ↵Gravatar caryclark2015-03-24
| | | | | | | | | | | | | | | | | | | | | https://codereview.chromium.org/1033703002/) Reason for revert: working on asan fix Original issue's description: > fix destructor order to fix build > > TBR=reed > > Committed: https://skia.googlesource.com/skia/+/c207f9b2e8d6fb5386197fa8a8d258d2c4603418 TBR=reed@android.com NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true Review URL: https://codereview.chromium.org/1033803002
* fix destructor order to fix buildGravatar caryclark2015-03-24
| | | | | | TBR=reed Review URL: https://codereview.chromium.org/1033703002
* pathops version twoGravatar caryclark2015-03-24
| | | | | | | | | | 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
* Enabling the canvas bit to turn the clip stack into a flat replace exposed ↵Gravatar caryclark2014-06-17
| | | | | | | | | | | | | | | | | | 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
* fix minor skp-found bugsGravatar commit-bot@chromium.org2014-04-25
| | | | | | | | | | | | | 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
* Mike R: please sanity check SkPostConfig.hGravatar commit-bot@chromium.org2014-04-14
| | | | | | | | | | | | | | | | | | | | | | | | 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
* pathops work in progressGravatar caryclark@google.com2013-11-01
| | | | | | | | BUG= Review URL: https://codereview.chromium.org/52653002 git-svn-id: http://skia.googlecode.com/svn/trunk@12089 2bbb7eff-a529-9590-31e7-b0007b416f81
* path ops work in progressGravatar caryclark@google.com2013-09-16
| | | | | | | | | | 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
* path ops near exactGravatar caryclark@google.com2013-07-15
| | | | | | | | | | | | | | | | | Modify line intersections to first - match exact ends - compute intersections - match near ends where the exact ends are preferred, then near matches, then computed matches. This pulls matches towards existing end points when possible, and keeps intersection distances consistent with different line/line line/quad and line/cubic computations. BUG= Review URL: https://codereview.chromium.org/19183003 git-svn-id: http://skia.googlecode.com/svn/trunk@10073 2bbb7eff-a529-9590-31e7-b0007b416f81
* SkPath::rewind needs to have same reset as SkPath::reset.Gravatar bungeman@google.com2013-06-21
| | | | | | | | R=caryclark@google.com, reed@google.com Review URL: https://codereview.chromium.org/17432003 git-svn-id: http://skia.googlecode.com/svn/trunk@9718 2bbb7eff-a529-9590-31e7-b0007b416f81
* convert pathops to use SkSTArray where possible.Gravatar caryclark@google.com2013-06-17
| | | | | | | | | | | | | | | | | | Replace SkTDArray with SkTArray and use SkSTArray when the probable array size is known. In a couple of places (spans, chases) the arrays are constructed using insert() so SkTArrays can't be used for now. Also, add an optimization to cubic subdivide if either end is zero or one. BUG= Review URL: https://codereview.chromium.org/16951017 git-svn-id: http://skia.googlecode.com/svn/trunk@9635 2bbb7eff-a529-9590-31e7-b0007b416f81
* path ops -- fix skp bugsGravatar caryclark@google.com2013-05-07
| | | | | | | | | 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
* path ops -- handle non-finite numbersGravatar caryclark@google.com2013-04-26
| | | | | | | | Op() and Simplify() do nothing if the input is non-finite. Add code and tests. Review URL: https://codereview.chromium.org/14407006 git-svn-id: http://skia.googlecode.com/svn/trunk@8882 2bbb7eff-a529-9590-31e7-b0007b416f81
* path ops : add support for inverse fillGravatar caryclark@google.com2013-04-22
| | | | | | | | add inverse fill, reverse diff, and gm tests cleaned up some interfaces Review URL: https://codereview.chromium.org/14371011 git-svn-id: http://skia.googlecode.com/svn/trunk@8798 2bbb7eff-a529-9590-31e7-b0007b416f81
* Add base types for path opsGravatar caryclark@google.com2013-04-08
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
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