The Tor Browser: gfx/skia/trunk/src/utils/SkCullPoints.cpp@6474c204b198 (annotated)

gfx/skia/trunk/src/utils/SkCullPoints.cpp@6474c204b198 (annotated)

gfx/skia/trunk/src/utils/SkCullPoints.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SkCullPoints.h"
 static bool cross_product_is_neg(const SkIPoint& v, int dx, int dy) {
 #if 0
     return v.fX * dy - v.fY * dx < 0;
 #else
     return sk_64_mul(v.fX, dy) < sk_64_mul(dx, v.fY);
 #endif
 }
 bool SkCullPoints::sect_test(int x0, int y0, int x1, int y1) const {
     const SkIRect& r = fR;
     if ((x0 < r.fLeft    && x1 < r.fLeft) ||
         (x0 > r.fRight   && x1 > r.fRight) ||
         (y0 < r.fTop     && y1 < r.fTop) ||
         (y0 > r.fBottom  && y1 > r.fBottom)) {
         return false;
     }
     // since the crossprod test is a little expensive, check for easy-in cases first
     if (r.contains(x0, y0) || r.contains(x1, y1)) {
         return true;
     }
     // At this point we're not sure, so we do a crossprod test
     SkIPoint           vec;
     const SkIPoint*    rAsQuad = fAsQuad;
     vec.set(x1 - x0, y1 - y0);
     bool isNeg = cross_product_is_neg(vec, x0 - rAsQuad[0].fX, y0 - rAsQuad[0].fY);
     for (int i = 1; i < 4; i++) {
         if (cross_product_is_neg(vec, x0 - rAsQuad[i].fX, y0 - rAsQuad[i].fY) != isNeg) {
             return true;
         }
     }
     return false;   // we didn't intersect
 }
 static void toQuad(const SkIRect& r, SkIPoint quad[4]) {
     SkASSERT(quad);
     quad[0].set(r.fLeft, r.fTop);
     quad[1].set(r.fRight, r.fTop);
     quad[2].set(r.fRight, r.fBottom);
     quad[3].set(r.fLeft, r.fBottom);
 }
 SkCullPoints::SkCullPoints() {
     SkIRect    r;
     r.setEmpty();
     this->reset(r);
 }
 SkCullPoints::SkCullPoints(const SkIRect& r) {
     this->reset(r);
 }
 void SkCullPoints::reset(const SkIRect& r) {
     fR = r;
     toQuad(fR, fAsQuad);
     fPrevPt.set(0, 0);
     fPrevResult = kNo_Result;
 }
 void SkCullPoints::moveTo(int x, int y) {
     fPrevPt.set(x, y);
     fPrevResult = kNo_Result;   // so we trigger a movetolineto later
 }
 SkCullPoints::LineToResult SkCullPoints::lineTo(int x, int y, SkIPoint line[]) {
     SkASSERT(line != NULL);
     LineToResult result = kNo_Result;
     int x0 = fPrevPt.fX;
     int y0 = fPrevPt.fY;
     // need to upgrade sect_test to chop the result
     // and to correctly return kLineTo_Result when the result is connected
     // to the previous call-out
     if (this->sect_test(x0, y0, x, y)) {
         line[0].set(x0, y0);
         line[1].set(x, y);
         if (fPrevResult != kNo_Result && fPrevPt.equals(x0, y0)) {
             result = kLineTo_Result;
         } else {
             result = kMoveToLineTo_Result;
         }
     }
     fPrevPt.set(x, y);
     fPrevResult = result;
     return result;
 }
 /////////////////////////////////////////////////////////////////////////////////////////////////
 #include "SkPath.h"
 SkCullPointsPath::SkCullPointsPath()
     : fCP(), fPath(NULL) {
 }
 SkCullPointsPath::SkCullPointsPath(const SkIRect& r, SkPath* dst)
     : fCP(r), fPath(dst) {
 }
 void SkCullPointsPath::reset(const SkIRect& r, SkPath* dst) {
     fCP.reset(r);
     fPath = dst;
 }
 void SkCullPointsPath::moveTo(int x, int y) {
     fCP.moveTo(x, y);
 }
 void SkCullPointsPath::lineTo(int x, int y) {
     SkIPoint   pts[2];
     switch (fCP.lineTo(x, y, pts)) {
     case SkCullPoints::kMoveToLineTo_Result:
         fPath->moveTo(SkIntToScalar(pts[0].fX), SkIntToScalar(pts[0].fY));
         // fall through to the lineto case
     case SkCullPoints::kLineTo_Result:
         fPath->lineTo(SkIntToScalar(pts[1].fX), SkIntToScalar(pts[1].fY));
         break;
     default:
         break;
     }
 }
 ///////////////////////////////////////////////////////////////////////////////
 #include "SkMatrix.h"
 #include "SkRegion.h"
 bool SkHitTestPath(const SkPath& path, SkRect& target, bool hires) {
     if (target.isEmpty()) {
         return false;
     }
     bool isInverse = path.isInverseFillType();
     if (path.isEmpty()) {
         return isInverse;
     }
     SkRect bounds = path.getBounds();
     bool sects = SkRect::Intersects(target, bounds);
     if (isInverse) {
         if (!sects) {
             return true;
         }
     } else {
         if (!sects) {
             return false;
         }
         if (target.contains(bounds)) {
             return true;
         }
     }
     SkPath devPath;
     const SkPath* pathPtr;
     SkRect        devTarget;
     if (hires) {
         const SkScalar coordLimit = SkIntToScalar(16384);
         const SkRect limit = { 0, 0, coordLimit, coordLimit };
         SkMatrix matrix;
         matrix.setRectToRect(bounds, limit, SkMatrix::kFill_ScaleToFit);
         path.transform(matrix, &devPath);
         matrix.mapRect(&devTarget, target);
         pathPtr = &devPath;
     } else {
         devTarget = target;
         pathPtr = &path;
     }
     SkIRect iTarget;
     devTarget.round(&iTarget);
     if (iTarget.isEmpty()) {
         iTarget.fLeft = SkScalarFloorToInt(devTarget.fLeft);
         iTarget.fTop = SkScalarFloorToInt(devTarget.fTop);
         iTarget.fRight = iTarget.fLeft + 1;
         iTarget.fBottom = iTarget.fTop + 1;
     }
     SkRegion clip(iTarget);
     SkRegion rgn;
     return rgn.setPath(*pathPtr, clip) ^ isInverse;
 }
 bool SkHitTestPath(const SkPath& path, SkScalar x, SkScalar y, bool hires) {
     const SkScalar half = SK_ScalarHalf;
     const SkScalar one = SK_Scalar1;
     SkRect r = SkRect::MakeXYWH(x - half, y - half, one, one);
     return SkHitTestPath(path, r, hires);
 }

The Tor Browser / annotate

gfx/skia/trunk/src/utils/SkCullPoints.cpp@6474c204b198 (annotated)

gfx/skia/trunk/src/utils/SkCullPoints.cpp