Moving 4 SkImageFilter derived classes from blink to skia

src/effects/SkCompositeImageFilter.cpp

+/*
+ * Copyright 2013 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 "SkCompositeImageFilter.h"
+#include "SkBitmap.h"
+#include "SkCanvas.h"
+#include "SkDevice.h"
+#include "SkFlattenableBuffers.h"
+#include "SkMatrix.h"
+#include "SkPaint.h"
+
+SkCompositeImageFilter::SkCompositeImageFilter(SkFlattenableReadBuffer& buffer) :
+    INHERITED(buffer) {
+    fMode = (SkXfermode::Mode) buffer.readInt();
+}
+
+bool SkCompositeImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& src, const SkMatrix& ctm,
+                                           SkBitmap* dst, SkIPoint* offset) {
+    SkBitmap background = src;
+    SkBitmap foreground = src;
+    SkImageFilter* backgroundInput = getInput(0);
+    SkImageFilter* foregroundInput = getInput(1);
+    SkIPoint backgroundOffset = SkIPoint::Make(0, 0), foregroundOffset = SkIPoint::Make(0, 0);
+    if (backgroundInput &&
+        !backgroundInput->filterImage(proxy, src, ctm, &background, &backgroundOffset)) {
+        return false;
+    }
+
+    if (foregroundInput &&
+        !foregroundInput->filterImage(proxy, src, ctm, &foreground, &foregroundOffset)) {
+        return false;
+    }
+
+    SkIRect bounds;
+    background.getBounds(&bounds);
+    if (!applyCropRect(&bounds, ctm)) {
+        return false;
+    }
+    backgroundOffset.fX -= bounds.left();
+    backgroundOffset.fY -= bounds.top();
+    foregroundOffset.fX -= bounds.left();
+    foregroundOffset.fY -= bounds.top();
+
+    SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(bounds.width(), bounds.height()));
+    SkCanvas canvas(device);
+    SkPaint paint;
+    paint.setXfermodeMode(SkXfermode::kSrc_Mode);
+    canvas.drawBitmap(background, SkIntToScalar(backgroundOffset.fX),
+                      SkIntToScalar(backgroundOffset.fY), &paint);
+    paint.setXfermodeMode(fMode);
+    canvas.drawBitmap(foreground, SkIntToScalar(foregroundOffset.fX),
+                      SkIntToScalar(foregroundOffset.fY), &paint);
+    *dst = device->accessBitmap(false);
+    offset->fX += bounds.left();
+    offset->fY += bounds.top();
+    return true;
+}
+
+void SkCompositeImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const {
+    this->INHERITED::flatten(buffer);
+    buffer.writeInt((int) fMode);
+}