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/*
* 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 "SkOpEdgeBuilder.h"
#include "SkPathOpsCommon.h"
bool TightBounds(const SkPath& path, SkRect* result) {
SkPath::RawIter iter(path);
SkRect moveBounds = { SK_ScalarMax, SK_ScalarMax, SK_ScalarMin, SK_ScalarMin };
bool wellBehaved = true;
SkPath::Verb verb;
do {
SkPoint pts[4];
verb = iter.next(pts);
switch (verb) {
case SkPath::kMove_Verb:
moveBounds.fLeft = SkTMin(moveBounds.fLeft, pts[0].fX);
moveBounds.fTop = SkTMin(moveBounds.fTop, pts[0].fY);
moveBounds.fRight = SkTMax(moveBounds.fRight, pts[0].fX);
moveBounds.fBottom = SkTMax(moveBounds.fBottom, pts[0].fY);
break;
case SkPath::kQuad_Verb:
case SkPath::kConic_Verb:
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 SkPath::kCubic_Verb:
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;
}
} while (verb != SkPath::kDone_Verb);
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
SkScalar scaleFactor = ScaleFactor(path);
SkPath scaledPath;
const SkPath* workingPath;
if (scaleFactor > SK_Scalar1) {
ScalePath(path, 1.f / scaleFactor, &scaledPath);
workingPath = &scaledPath;
} else {
workingPath = &path;
}
SkOpEdgeBuilder builder(*workingPath, 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());
}
if (scaleFactor > SK_Scalar1) {
bounds.set(bounds.left() * scaleFactor, bounds.top() * scaleFactor,
bounds.right() * scaleFactor, bounds.bottom() * scaleFactor);
}
*result = bounds;
if (!moveBounds.isEmpty()) {
result->join(moveBounds);
}
return true;
}
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