Revert "Experimental blur code."

This reverts commit d96ed9d0def2d660f537e4ab5c79e9e66470ee22.

Reason for revert: dm crashing

https://luci-milo.appspot.com/swarming/task/374d82c1d1263910/steps/symbolized_dm/0/stdout

Likely culprit:
	unit test  BlurDrawing

Stack trace:
    /mnt/pd0/s/w/ir/out/Debug/dm(+0x2440eb) [0x568770eb]
    linux-gate.so.1(__kernel_sigreturn+0) [0xf7714ca0]
    /mnt/pd0/s/w/ir/out/Debug/dm(_ZNK16SkMaskBlurFilter11blurOneScanENS_10FilterInfoEPKhjS2_PhjS3_+0x236) [0x5766301e]
    /mnt/pd0/s/w/ir/out/Debug/dm(_ZNK16SkMaskBlurFilter4blurERK6SkMaskPS0_+0x285) [0x57663491]
    /mnt/pd0/s/w/ir/out/Debug/dm(_ZN10SkBlurMask7BoxBlurEP6SkMaskRKS0_f11SkBlurStyle13SkBlurQualityP8SkIPointb+0x5c) [0x5720d48e]
    /mnt/pd0/s/w/ir/out/Debug/dm(_ZNK20SkBlurMaskFilterImpl10filterMaskEP6SkMaskRKS0_RK8SkMatrixP8SkIPoint+0x67) [0x5720e427]
    /mnt/pd0/s/w/ir/out/Debug/dm(_ZNK20SkBlurMaskFilterImpl17filterRectsToNineEPK6SkRectiRK8SkMatrixRK7SkIRectPN12SkMaskFilter9NinePatchE+0x579) [0x5721a247]
    /mnt/pd0/s/w/ir/out/Debug/dm(_ZNK12SkMaskFilter10filterPathERK6SkPathRK8SkMatrixRK12SkRasterClipP9SkBlitterN11SkStrokeRec9InitStyleE+0xf6) [0x5706c2bc]
    /mnt/pd0/s/w/ir/out/Debug/dm(_ZNK6SkDraw11drawDevPathERK6SkPathRK7SkPaintbP9SkBlitterb+0x1bb) [0x57034f1b]
    /mnt/pd0/s/w/ir/out/Debug/dm(_ZNK6SkDraw8drawPathERK6SkPathRK7SkPaintPK8SkMatrixbbP9SkBlitter+0x47f) [0x57035dd3]
    /mnt/pd0/s/w/ir/out/Debug/dm(_ZN14SkBitmapDevice8drawPathERK6SkPathRK7SkPaintPK8SkMatrixb+0x6e) [0x56f937fc]
    /mnt/pd0/s/w/ir/out/Debug/dm(_ZN8SkCanvas10onDrawPathERK6SkPathRK7SkPaint+0x39d) [0x56fb12e5]
    /mnt/pd0/s/w/ir/out/Debug/dm(_ZN8SkCanvas8drawPathERK6SkPathRK7SkPaint+0x18) [0x56fad926]
    /mnt/pd0/s/w/ir/out/Debug/dm(+0x3f71b3) [0x56a2a1b3]
    /mnt/pd0/s/w/ir/out/Debug/dm(+0x2450bd) [0x568780bd]
    /mnt/pd0/s/w/ir/out/Debug/dm(+0x2450fb) [0x568780fb]
    /mnt/pd0/s/w/ir/out/Debug/dm(+0xae53e7) [0x571183e7]
    /mnt/pd0/s/w/ir/out/Debug/dm(_ZNKSt8functionIFvvEEclEv+0x20) [0x569f98de]
    /mnt/pd0/s/w/ir/out/Debug/dm(_ZN12SkThreadPool4LoopEPv+0x298) [0x57045b2f]
    /mnt/pd0/s/w/ir/out/Debug/dm(+0xbbd92c) [0x571f092c]
    /lib/i386-linux-gnu/libpthread.so.0(+0x627a) [0xf76e827a]
    /lib/i386-linux-gnu/libc.so.6(clone+0x66) [0xf70ecb56]
Segmentation fault

Original change's description:
> Experimental blur code.
> 
> This uses a new method of blurring that runs the three 
> passes of the box filter in a single pass. This implementation
> currently only does 1x1 pixel at a time, but it should be simple
> to expand to 4x4 pixels at a time.
> 
> On the  blur_10_normal_high_quality benchmark, the new is 7% faster
> than the old code. For the blur_100.50_normal_high_quality
> benchmark, the new code is 11% slower.
> 
> Change-Id: Iea37294abc7c27de5ad569adf8bc62df77eafd02
> Reviewed-on: https://skia-review.googlesource.com/21739
> Commit-Queue: Herb Derby <herb@google.com>
> Reviewed-by: Mike Reed <reed@google.com>

TBR=herb@google.com,reed@google.com

Change-Id: I9e896c548d0a4cd3308d6a311c8bd16719a08a85
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/22421
Reviewed-by: Florin Malita <fmalita@google.com>
Commit-Queue: Florin Malita <fmalita@google.com>

1 files changed, 0 insertions, 67 deletions

diff --git a/src/core/SkMaskBlurFilter.h b/src/core/SkMaskBlurFilter.h
deleted file mode 100644
index 9becadca39..0000000000
--- a/src/core/SkMaskBlurFilter.h
+++ /dev/null
@@ -1,67 +0,0 @@
-/*
- * Copyright 2017 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef SkBlurMaskFilter_DEFINED
-#define SkBlurMaskFilter_DEFINED
-
-#include <algorithm>
-#include <memory>
-
-#include "SkMask.h"
-#include "SkTypes.h"
-
-// Implement a single channel Gaussian blur. The specifics for implementation are taken from:
-// https://drafts.fxtf.org/filters/#feGaussianBlurElement
-class SkMaskBlurFilter {
-public:
-    // Given a filter specified by sigma, generate various quantities.
-    class FilterInfo {
-    public:
-        explicit FilterInfo(double sigma);
-
-        // The final weight to divide by given a box size calculated from sigma accumulated for
-        // all three passes. For example, if the box size is 5, then the final weight for all
-        // three passes is 5^3 or 125.
-        uint64_t weight() const;
-
-        // The distance between the first value of the dst and the first value of the src.
-        uint32_t borderSize() const;
-
-        // The size of the box filter.
-        size_t   diameter(uint8_t) const;
-
-        // A factor used to simulate division using multiplication and shift.
-        uint64_t scaledWeight() const;
-
-    private:
-        const uint32_t fFilterWindow;
-        const uint64_t fScaledWeight;
-    };
-
-    // Create an object suitable for filtering an SkMask using a filter with width sigmaW and
-    // height sigmaH.
-    SkMaskBlurFilter(double sigmaW, double sigmaH);
-
-    // Given a src SkMask, generate dst SkMask returning the border width and height.
-    SkIPoint blur(const SkMask& src, SkMask* dst) const;
-
-private:
-    size_t bufferSize(uint8_t bufferPass) const;
-
-    void blurOneScan(FilterInfo gen,
-                     const uint8_t* src, size_t srcStride, const uint8_t* srcEnd,
-                           uint8_t* dst, size_t dstStride,       uint8_t* dstEnd) const;
-
-
-    const FilterInfo            fInfoW,
-                                fInfoH;
-    std::unique_ptr<uint32_t[]> fBuffer0,
-                                fBuffer1,
-                                fBuffer2;
-};
-
-#endif  // SkBlurMaskFilter_DEFINED