blob: 095b0a9742d9888eb82bb7c59382fe40f78aace0 [file] [log] [blame]
/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "include/core/SkPath.h"
#include "include/core/SkPathTypes.h"
#include "include/core/SkPoint.h"
#include "include/core/SkRect.h"
#include "include/core/SkScalar.h"
#include "include/pathops/SkPathOps.h"
#include "src/core/SkArenaAlloc.h"
#include "src/core/SkPathPriv.h"
#include "src/pathops/SkOpContour.h"
#include "src/pathops/SkOpEdgeBuilder.h"
#include "src/pathops/SkPathOpsBounds.h"
#include "src/pathops/SkPathOpsCommon.h"
#include "src/pathops/SkPathOpsTypes.h"
#include <algorithm>
bool TightBounds(const SkPath& path, SkRect* result) {
SkRect moveBounds = { SK_ScalarMax, SK_ScalarMax, SK_ScalarMin, SK_ScalarMin };
bool wellBehaved = true;
for (auto [verb, pts, w] : SkPathPriv::Iterate(path)) {
switch (verb) {
case SkPathVerb::kMove:
moveBounds.fLeft = std::min(moveBounds.fLeft, pts[0].fX);
moveBounds.fTop = std::min(moveBounds.fTop, pts[0].fY);
moveBounds.fRight = std::max(moveBounds.fRight, pts[0].fX);
moveBounds.fBottom = std::max(moveBounds.fBottom, pts[0].fY);
break;
case SkPathVerb::kQuad:
case SkPathVerb::kConic:
if (!wellBehaved) {
break;
}
wellBehaved &= between(pts[0].fX, pts[1].fX, pts[2].fX);
wellBehaved &= between(pts[0].fY, pts[1].fY, pts[2].fY);
break;
case SkPathVerb::kCubic:
if (!wellBehaved) {
break;
}
wellBehaved &= between(pts[0].fX, pts[1].fX, pts[3].fX);
wellBehaved &= between(pts[0].fY, pts[1].fY, pts[3].fY);
wellBehaved &= between(pts[0].fX, pts[2].fX, pts[3].fX);
wellBehaved &= between(pts[0].fY, pts[2].fY, pts[3].fY);
break;
default:
break;
}
}
if (wellBehaved) {
*result = path.getBounds();
return true;
}
SkSTArenaAlloc<4096> allocator; // FIXME: constant-ize, tune
SkOpContour contour;
SkOpContourHead* contourList = static_cast<SkOpContourHead*>(&contour);
SkOpGlobalState globalState(contourList, &allocator SkDEBUGPARAMS(false)
SkDEBUGPARAMS(nullptr));
// turn path into list of segments
SkOpEdgeBuilder builder(path, contourList, &globalState);
if (!builder.finish()) {
return false;
}
if (!SortContourList(&contourList, false, false)) {
*result = moveBounds;
return true;
}
SkOpContour* current = contourList;
SkPathOpsBounds bounds = current->bounds();
while ((current = current->next())) {
bounds.add(current->bounds());
}
*result = bounds;
if (!moveBounds.isEmpty()) {
result->join(moveBounds);
}
return true;
}