remove DownSample imagefilter

src/effects/SkTestImageFilters.cpp

Index: src/effects/SkTestImageFilters.cpp
diff --git a/src/effects/SkTestImageFilters.cpp b/src/effects/SkTestImageFilters.cpp
deleted file mode 100755
index 208053b90edf00eefcd2c997a8d830d198a43bb6..0000000000000000000000000000000000000000
--- a/src/effects/SkTestImageFilters.cpp
+++ /dev/null
@@ -1,109 +0,0 @@
-/*
- * Copyright 2011 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "SkTestImageFilters.h"
-#include "SkCanvas.h"
-#include "SkReadBuffer.h"
-#include "SkSpecialImage.h"
-#include "SkSpecialSurface.h"
-#include "SkWriteBuffer.h"
-
-///////////////////////////////////////////////////////////////////////////////
-
-sk_sp<SkImageFilter> SkDownSampleImageFilter::Make(SkScalar scale, sk_sp<SkImageFilter> input) {
-    if (!SkScalarIsFinite(scale)) {
-        return nullptr;
-    }
-    // we don't support scale in this range
-    if (scale > SK_Scalar1 || scale <= 0) {
-        return nullptr;
-    }
-    return sk_sp<SkImageFilter>(new SkDownSampleImageFilter(scale, std::move(input)));
-}
-
-sk_sp<SkSpecialImage> SkDownSampleImageFilter::onFilterImage(SkSpecialImage* source,
-                                                             const Context& ctx,
-                                                             SkIPoint* offset) const {
-    if (fScale > SK_Scalar1 || fScale <= 0) {
-        return nullptr;
-    }
-
-    int dstW = SkScalarRoundToInt(source->width() * fScale);
-    int dstH = SkScalarRoundToInt(source->height() * fScale);
-    if (dstW < 1) {
-        dstW = 1;
-    }
-    if (dstH < 1) {
-        dstH = 1;
-    }
-
-    sk_sp<SkSpecialImage> tmp;
-
-    // downsample
-    {
-        const SkImageInfo info = SkImageInfo::MakeN32Premul(dstW, dstH);
-
-        sk_sp<SkSpecialSurface> surf(source->makeSurface(info));
-        if (!surf) {
-            return nullptr;
-        }
-
-        SkCanvas* canvas = surf->getCanvas();
-        SkASSERT(canvas);
-
-        canvas->clear(0x0);
-
-        SkPaint paint;
-        paint.setXfermodeMode(SkXfermode::kSrcOver_Mode);
-        paint.setFilterQuality(kLow_SkFilterQuality);
-
-        canvas->scale(fScale, fScale);
-        source->draw(canvas, 0, 0, &paint);
-
-        tmp = surf->makeImageSnapshot();
-    }
-
-    // upscale
-    {
-        const SkImageInfo info = SkImageInfo::MakeN32Premul(source->width(), source->height());
-
-        sk_sp<SkSpecialSurface> surf(source->makeSurface(info));
-        if (!surf) {
-            return nullptr;
-        }
-
-        SkCanvas* canvas = surf->getCanvas();
-        SkASSERT(canvas);
-
-        canvas->clear(0x0);
-
-        SkPaint paint;
-        paint.setXfermodeMode(SkXfermode::kSrcOver_Mode);
-
-        canvas->scale(SkScalarInvert(fScale), SkScalarInvert(fScale));
-        tmp->draw(canvas, 0, 0, &paint);
-
-        return surf->makeImageSnapshot();
-    }
-}
-
-sk_sp<SkFlattenable> SkDownSampleImageFilter::CreateProc(SkReadBuffer& buffer) {
-    SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
-    return Make(buffer.readScalar(), common.getInput(0));
-}
-
-void SkDownSampleImageFilter::flatten(SkWriteBuffer& buffer) const {
-    this->INHERITED::flatten(buffer);
-    buffer.writeScalar(fScale);
-}
-
-#ifndef SK_IGNORE_TO_STRING
-void SkDownSampleImageFilter::toString(SkString* str) const {
-    str->appendf("SkDownSampleImageFilter: (");
-    str->append(")");
-}
-#endif