Move SkMatrixImageFilter into core, and add a factory fn for it.

src/effects/SkMatrixImageFilter.cpp

Index: src/effects/SkMatrixImageFilter.cpp
diff --git a/src/effects/SkMatrixImageFilter.cpp b/src/effects/SkMatrixImageFilter.cpp
deleted file mode 100644
index a61867e041a0fad2447f4aa7f9b1468d7a2f95dd..0000000000000000000000000000000000000000
--- a/src/effects/SkMatrixImageFilter.cpp
+++ /dev/null
@@ -1,148 +0,0 @@
-/*
- * Copyright 2014 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 "SkMatrixImageFilter.h"
-#include "SkBitmap.h"
-#include "SkCanvas.h"
-#include "SkDevice.h"
-#include "SkColorPriv.h"
-#include "SkReadBuffer.h"
-#include "SkWriteBuffer.h"
-#include "SkMatrix.h"
-#include "SkRect.h"
-
-SkMatrixImageFilter::SkMatrixImageFilter(const SkMatrix& transform,
-                                         SkFilterQuality filterQuality,
-                                         SkImageFilter* input)
-  : INHERITED(1, &input),
-    fTransform(transform),
-    fFilterQuality(filterQuality) {
-}
-
-SkMatrixImageFilter* SkMatrixImageFilter::Create(const SkMatrix& transform,
-                                                 SkFilterQuality filterQuality,
-                                                 SkImageFilter* input) {
-    return SkNEW_ARGS(SkMatrixImageFilter, (transform, filterQuality, input));
-}
-
-SkFlattenable* SkMatrixImageFilter::CreateProc(SkReadBuffer& buffer) {
-    SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
-    SkMatrix matrix;
-    buffer.readMatrix(&matrix);
-    SkFilterQuality quality = static_cast<SkFilterQuality>(buffer.readInt());
-    return Create(matrix, quality, common.getInput(0));
-}
-
-void SkMatrixImageFilter::flatten(SkWriteBuffer& buffer) const {
-    this->INHERITED::flatten(buffer);
-    buffer.writeMatrix(fTransform);
-    buffer.writeInt(fFilterQuality);
-}
-
-SkMatrixImageFilter::~SkMatrixImageFilter() {
-}
-
-bool SkMatrixImageFilter::onFilterImage(Proxy* proxy,
-                                        const SkBitmap& source,
-                                        const Context& ctx,
-                                        SkBitmap* result,
-                                        SkIPoint* offset) const {
-    SkBitmap src = source;
-    SkIPoint srcOffset = SkIPoint::Make(0, 0);
-    if (getInput(0) && !getInput(0)->filterImage(proxy, source, ctx, &src, &srcOffset)) {
-        return false;
-    }
-
-    SkRect dstRect;
-    SkIRect srcBounds, dstBounds;
-    src.getBounds(&srcBounds);
-    srcBounds.offset(srcOffset);
-    SkRect srcRect = SkRect::Make(srcBounds);
-    SkMatrix matrix;
-    if (!ctx.ctm().invert(&matrix)) {
-        return false;
-    }
-    matrix.postConcat(fTransform);
-    matrix.postConcat(ctx.ctm());
-    matrix.mapRect(&dstRect, srcRect);
-    dstRect.roundOut(&dstBounds);
-
-    SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(dstBounds.width(), dstBounds.height()));
-    if (NULL == device.get()) {
-        return false;
-    }
-
-    SkCanvas canvas(device.get());
-    canvas.translate(-SkIntToScalar(dstBounds.x()), -SkIntToScalar(dstBounds.y()));
-    canvas.concat(matrix);
-    SkPaint paint;
-
-    paint.setXfermodeMode(SkXfermode::kSrc_Mode);
-    paint.setFilterQuality(fFilterQuality);
-    canvas.drawBitmap(src, srcRect.x(), srcRect.y(), &paint);
-
-    *result = device.get()->accessBitmap(false);
-    offset->fX = dstBounds.fLeft;
-    offset->fY = dstBounds.fTop;
-    return true;
-}
-
-void SkMatrixImageFilter::computeFastBounds(const SkRect& src, SkRect* dst) const {
-    SkRect bounds = src;
-    if (getInput(0)) {
-        getInput(0)->computeFastBounds(src, &bounds);
-    }
-    fTransform.mapRect(dst, bounds);
-    dst->join(bounds);   // Work around for skia:3194
-}
-
-bool SkMatrixImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix& ctm,
-                                         SkIRect* dst) const {
-    SkMatrix transformInverse;
-    if (!fTransform.invert(&transformInverse)) {
-        return false;
-    }
-    SkMatrix matrix;
-    if (!ctm.invert(&matrix)) {
-        return false;
-    }
-    matrix.postConcat(transformInverse);
-    matrix.postConcat(ctm);
-    SkRect floatBounds;
-    matrix.mapRect(&floatBounds, SkRect::Make(src));
-    SkIRect bounds = floatBounds.roundOut();
-    if (getInput(0) && !getInput(0)->filterBounds(bounds, ctm, &bounds)) {
-        return false;
-    }
-
-    *dst = bounds;
-    return true;
-}
-
-#ifndef SK_IGNORE_TO_STRING
-void SkMatrixImageFilter::toString(SkString* str) const {
-    str->appendf("SkMatrixImageFilter: (");
-
-    str->appendf("transform: (%f %f %f %f %f %f %f %f %f)",
-                 fTransform[SkMatrix::kMScaleX],
-                 fTransform[SkMatrix::kMSkewX],
-                 fTransform[SkMatrix::kMTransX],
-                 fTransform[SkMatrix::kMSkewY],
-                 fTransform[SkMatrix::kMScaleY],
-                 fTransform[SkMatrix::kMTransY],
-                 fTransform[SkMatrix::kMPersp0],
-                 fTransform[SkMatrix::kMPersp1],
-                 fTransform[SkMatrix::kMPersp2]);
-
-    str->append("<dt>FilterLevel:</dt><dd>");
-    static const char* gFilterLevelStrings[] = { "None", "Low", "Medium", "High" };
-    str->append(gFilterLevelStrings[fFilterQuality]);
-    str->append("</dd>");
-
-    str->appendf(")");
-}
-#endif