Implement an SkPicture image filter source. This is required for the external-SVG reference feature of feImage. It simply plays back an SkPicture to a given destination rect.
R=reed@google.com
Review URL: https://codereview.chromium.org/114263002
git-svn-id: http://skia.googlecode.com/svn/trunk@12661 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/effects/SkPictureImageFilter.cpp b/src/effects/SkPictureImageFilter.cpp
new file mode 100644
index 0000000..5b4af65
--- /dev/null
+++ b/src/effects/SkPictureImageFilter.cpp
@@ -0,0 +1,77 @@
+/*
+ * 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 "SkPictureImageFilter.h"
+#include "SkDevice.h"
+#include "SkCanvas.h"
+#include "SkFlattenableBuffers.h"
+#include "SkValidationUtils.h"
+
+SkPictureImageFilter::SkPictureImageFilter(SkPicture* picture)
+ : INHERITED(0, 0),
+ fPicture(picture),
+ fRect(SkRect::MakeWH(picture ? SkIntToScalar(picture->width()) : 0,
+ picture ? SkIntToScalar(picture->height()) : 0)) {
+ SkSafeRef(fPicture);
+}
+
+SkPictureImageFilter::SkPictureImageFilter(SkPicture* picture, const SkRect& rect)
+ : INHERITED(0, 0),
+ fPicture(picture),
+ fRect(rect) {
+ SkSafeRef(fPicture);
+}
+
+SkPictureImageFilter::~SkPictureImageFilter() {
+ SkSafeUnref(fPicture);
+}
+
+SkPictureImageFilter::SkPictureImageFilter(SkFlattenableReadBuffer& buffer)
+ : INHERITED(0, buffer),
+ fPicture(NULL) {
+ // FIXME: unflatten picture here.
+ buffer.readRect(&fRect);
+}
+
+void SkPictureImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const {
+ this->INHERITED::flatten(buffer);
+ // FIXME: flatten picture here.
+ buffer.writeRect(fRect);
+}
+
+bool SkPictureImageFilter::onFilterImage(Proxy* proxy, const SkBitmap&, const SkMatrix& matrix,
+ SkBitmap* result, SkIPoint* offset) {
+ if (!fPicture) {
+ return true;
+ }
+
+ SkRect floatBounds;
+ SkIRect bounds;
+ matrix.mapRect(&floatBounds, fRect);
+ floatBounds.roundOut(&bounds);
+
+ if (bounds.isEmpty()) {
+ return true;
+ }
+
+ SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(bounds.width(), bounds.height()));
+ if (NULL == device.get()) {
+ return false;
+ }
+
+ SkCanvas canvas(device.get());
+ SkPaint paint;
+
+ canvas.translate(-SkIntToScalar(bounds.fLeft), -SkIntToScalar(bounds.fTop));
+ canvas.concat(matrix);
+ canvas.drawPicture(*fPicture);
+
+ *result = device.get()->accessBitmap(false);
+ offset->fX += bounds.fLeft;
+ offset->fY += bounds.fTop;
+ return true;
+}