Moving 4 SkImageFilter derived classes from blink to skia

src/effects/SkTileImageFilter.cpp

+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkTileImageFilter.h"
+#include "SkBitmap.h"
+#include "SkCanvas.h"
+#include "SkDevice.h"
+#include "SkFlattenableBuffers.h"
+#include "SkMatrix.h"
+#include "SkPaint.h"
+#include "SkShader.h"
+
+bool SkTileImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& src, const SkMatrix& ctm,
+                                      SkBitmap* dst, SkIPoint* offset) {
+    SkBitmap source = src;
+    SkImageFilter* input = getInput(0);
+    SkIPoint localOffset = SkIPoint::Make(0, 0);
+    if (input && !input->filterImage(proxy, src, ctm, &source, &localOffset)) {
+        return false;
+    }
+
+    int w = SkScalarTruncToInt(fDstRect.width());
+    int h = SkScalarTruncToInt(fDstRect.height());
+    if (!fSrcRect.width() || !fSrcRect.height() || !w || !h) {
+        return false;
+    }
+
+    SkIRect srcRect;
+    fSrcRect.roundOut(&srcRect);
+    SkBitmap subset;
+    if (!source.extractSubset(&subset, srcRect)) {
+        return false;
+    }
+
+    SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(w, h));
+    SkIRect bounds;
+    source.getBounds(&bounds);
+    SkCanvas canvas(device);
+    SkPaint paint;
+    paint.setXfermodeMode(SkXfermode::kSrc_Mode);
+
+    SkAutoTUnref<SkShader> shader(SkShader::CreateBitmapShader(subset, 
+                                  SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode));
+    paint.setShader(shader);
+    SkRect dstRect = fDstRect;
+    dstRect.offset(SkIntToScalar(localOffset.fX), SkIntToScalar(localOffset.fY));
+    canvas.drawRect(dstRect, paint);
+    *dst = device->accessBitmap(false);
+    return true;
+}
+
+SkTileImageFilter::SkTileImageFilter(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {
+    buffer.readRect(&fSrcRect);
+    buffer.readRect(&fDstRect);
+}
+
+void SkTileImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const {
+    this->INHERITED::flatten(buffer);
+    buffer.writeRect(fSrcRect);
+    buffer.writeRect(fDstRect);
+}
+