Revert "long rect dash with guards"

This reverts commit 4ad0c592ce830f17ff07052f20392caa700e9a53.

Reason for revert: test fails in tiled case
Original change's description:
> long rect dash with guards
> 
> check dash fix back in with
> guards against changing
> chrome layout test results
> 
> original CL: skia-review.googlesource.com/c/skia/+/84862
> 
> efficiently dash very large rectangles and very long lines
> Speed up dashing when lines and rects are absurdly large.
> 
> Prior to this CL, only horizontal lines were detected.
> 
> Also folded in a change to handle dashing of zero length lines.
> 
> TBR=egdaniel@google.com
> Bug: skia:7311
> Change-Id: I139b10f676e7ae06ad83aaf2a35d49cf06280a67
> Reviewed-on: https://skia-review.googlesource.com/87760
> Commit-Queue: Cary Clark <caryclark@skia.org>
> Reviewed-by: Cary Clark <caryclark@skia.org>

TBR=egdaniel@google.com,caryclark@skia.org

Change-Id: Ifd35ddf395826a55c72e650470527d01740b6438
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:7311
Reviewed-on: https://skia-review.googlesource.com/87841
Reviewed-by: Cary Clark <caryclark@google.com>
Commit-Queue: Cary Clark <caryclark@google.com>

2 files changed, 0 insertions, 162 deletions

diff --git a/gm/strokes.cpp b/gm/strokes.cpp
index df632dc269..ed13d090ff 100644
--- a/gm/strokes.cpp
+++ b/gm/strokes.cpp
@@ -533,34 +533,3 @@ DEF_SIMPLE_GM(zerolinedash, canvas, 256, 256) {
 
     canvas->drawLine(100, 100, 100, 100, paint);
 }
-
-#define PDF_IS_FIXED_SO_THIS_DOESNT_BREAK_IT
-#ifdef PDF_IS_FIXED_SO_THIS_DOESNT_BREAK_IT
-DEF_SIMPLE_GM(longrect_dash, canvas, 250, 250) {
-    canvas->clear(SK_ColorWHITE);
-
-    SkPaint paint;
-    paint.setColor(SkColorSetARGB(255, 0, 0, 0));
-    paint.setStrokeWidth(5);
-    paint.setStrokeCap(SkPaint::kRound_Cap);
-    paint.setStrokeJoin(SkPaint::kBevel_Join);
-    paint.setStyle(SkPaint::kStroke_Style);
-    SkScalar dash_pattern[] = {1, 5};
-    paint.setPathEffect(SkDashPathEffect::Make(dash_pattern, 2, 0));
-    // try all combinations of stretching bounds
-    for (auto left : { 20.f, -100001.f } ) {
-        for (auto top : { 20.f, -100001.f } ) {
-            for (auto right : { 40.f, 100001.f } ) {
-                for (auto bottom : { 40.f, 100001.f } ) {
-                    canvas->save();
-                    canvas->clipRect({10, 10, 50, 50});
-                    canvas->drawRect({left, top, right, bottom}, paint);
-                    canvas->restore();
-                    canvas->translate(60, 0);
-               }
-            }
-            canvas->translate(-60 * 4, 60);
-        }
-    }
-}
-#endif
diff --git a/src/utils/SkDashPath.cpp b/src/utils/SkDashPath.cpp
index 34953c9465..cbfc8f2168 100644
--- a/src/utils/SkDashPath.cpp
+++ b/src/utils/SkDashPath.cpp
@@ -83,95 +83,11 @@ static void outset_for_stroke(SkRect* rect, const SkStrokeRec& rec) {
     rect->outset(radius, radius);
 }
 
-#ifndef SK_SUPPORT_LEGACY_DASH_CULL_PATH
-// If line is zero-length, bump out the end by a tiny amount
-// to draw endcaps. The bump factor is sized so that
-// SkPoint::Distance() computes a non-zero length.
-// Offsets SK_ScalarNearlyZero or smaller create empty paths when Iter measures length.
-// Large values are scaled by SK_ScalarNearlyZero so significant bits change.
-static void adjust_zero_length_line(SkPoint pts[2]) {
-    SkASSERT(pts[0] == pts[1]);
-    pts[1].fX += SkTMax(1.001f, pts[1].fX) * SK_ScalarNearlyZero;
-}
-
-static bool clip_line(SkPoint pts[2], const SkRect& bounds, SkScalar intervalLength,
-                      SkScalar priorPhase) {
-    SkVector dxy = pts[1] - pts[0];
-
-    // only horizontal or vertical lines
-    if (dxy.fX && dxy.fY) {
-        return false;
-    }
-    int xyOffset = SkToBool(dxy.fY);  // 0 to adjust horizontal, 1 to adjust vertical
-
-    SkScalar minXY = (&pts[0].fX)[xyOffset];
-    SkScalar maxXY = (&pts[1].fX)[xyOffset];
-    bool swapped = maxXY < minXY;
-    if (swapped) {
-        SkTSwap(minXY, maxXY);
-    }
-
-    SkASSERT(minXY <= maxXY);
-    SkScalar leftTop = (&bounds.fLeft)[xyOffset];
-    SkScalar rightBottom = (&bounds.fRight)[xyOffset];
-    if (maxXY < leftTop || minXY > rightBottom) {
-        return false;
-    }
-
-    // Now we actually perform the chop, removing the excess to the left/top and
-    // right/bottom of the bounds (keeping our new line "in phase" with the dash,
-    // hence the (mod intervalLength).
-
-    if (minXY < leftTop) {
-        minXY = leftTop - SkScalarMod(leftTop - minXY, intervalLength);
-        if (!swapped) {
-            minXY -= priorPhase;  // for rectangles, adjust by prior phase
-        }
-    }
-    if (maxXY > rightBottom) {
-        maxXY = rightBottom + SkScalarMod(maxXY - rightBottom, intervalLength);
-        if (swapped) {
-            maxXY += priorPhase;  // for rectangles, adjust by prior phase
-        }
-    }
-
-    SkASSERT(maxXY >= minXY);
-    if (swapped) {
-        SkTSwap(minXY, maxXY);
-    }
-    (&pts[0].fX)[xyOffset] = minXY;
-    (&pts[1].fX)[xyOffset] = maxXY;
-
-    if (minXY == maxXY) {
-        adjust_zero_length_line(pts);
-    }
-    return true;
-}
-
-static bool contains_inclusive(const SkRect& rect, const SkPoint& pt) {
-    return rect.fLeft <= pt.fX && pt.fX <= rect.fRight &&
-            rect.fTop <= pt.fY && pt.fY <= rect.fBottom;
-}
-
-// Returns true is b is between a and c, that is: a <= b <= c, or a >= b >= c.
-// Can perform this test with one branch by observing that, relative to b,
-// the condition is true only if one side is positive and one side is negative.
-// If the numbers are very small, the optimization may return the wrong result
-// because the multiply may generate a zero where the simple compare does not.
-// For this reason the assert does not fire when all three numbers are near zero.
-static bool between(SkScalar a, SkScalar b, SkScalar c) {
-    SkASSERT(((a <= b && b <= c) || (a >= b && b >= c)) == ((a - b) * (c - b) <= 0)
-            || (SkScalarNearlyZero(a) && SkScalarNearlyZero(b) && SkScalarNearlyZero(c)));
-    return (a - b) * (c - b) <= 0;
-}
-#endif
-
 // Only handles lines for now. If returns true, dstPath is the new (smaller)
 // path. If returns false, then dstPath parameter is ignored.
 static bool cull_path(const SkPath& srcPath, const SkStrokeRec& rec,
                       const SkRect* cullRect, SkScalar intervalLength,
                       SkPath* dstPath) {
-#ifdef SK_SUPPORT_LEGACY_DASH_CULL_PATH
     if (nullptr == cullRect) {
         return false;
     }
@@ -230,53 +146,6 @@ static bool cull_path(const SkPath& srcPath, const SkStrokeRec& rec,
     if (minX == maxX) {
         pts[1].fX += maxX * FLT_EPSILON * 32;  // 16 instead of 32 does not draw; length stays zero
     }
-#else // !SK_SUPPORT_LEGACY_DASH_CULL_PATH
-    SkPoint pts[4];
-    if (nullptr == cullRect) {
-        if (srcPath.isLine(pts) && pts[0] == pts[1]) {
-            adjust_zero_length_line(pts);
-        } else {
-            return false;
-        }
-    } else {
-        SkRect bounds;
-        bool isLine = srcPath.isLine(pts);
-        bool isRect = !isLine && srcPath.isRect(nullptr);
-        if (!isLine && !isRect) {
-            return false;
-        }
-        bounds = *cullRect;
-        outset_for_stroke(&bounds, rec);
-        if (isRect) {
-            // break rect into four lines, and call each one separately
-            SkPath::Iter iter(srcPath, false);
-            SkAssertResult(SkPath::kMove_Verb == iter.next(pts));
-            SkScalar priorLength = 0;
-            while (SkPath::kLine_Verb == iter.next(pts)) {
-                SkVector v = pts[1] - pts[0];
-                // if line is entirely outside clip rect, skip it
-                if (v.fX ? between(cullRect->fTop, pts[0].fY, cullRect->fBottom) :
-                        between(cullRect->fLeft, pts[0].fX, cullRect->fRight)) {
-                    bool skipMoveTo = contains_inclusive(*cullRect, pts[0]);
-                    if (clip_line(pts, bounds, intervalLength,
-                                  SkScalarMod(priorLength, intervalLength))) {
-                        if (0 == priorLength || !skipMoveTo) {
-                            dstPath->moveTo(pts[0]);
-                        }
-                        dstPath->lineTo(pts[1]);
-                    }
-                }
-                // keep track of all prior lengths to set phase of next line
-                priorLength += SkScalarAbs(v.fX ? v.fX : v.fY);
-            }
-            return !dstPath->isEmpty();
-        }
-        SkASSERT(isLine);
-        if (!clip_line(pts, bounds, intervalLength, 0)) {
-            return false;
-        }
-    }
-#endif
     dstPath->moveTo(pts[0]);
     dstPath->lineTo(pts[1]);
     return true;