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

BUG=skia:

Review URL: https://codereview.chromium.org/1011273003

1 files changed, 148 insertions, 0 deletions

diff --git a/src/core/SkMatrixImageFilter.cpp b/src/core/SkMatrixImageFilter.cpp
new file mode 100644
index 0000000000..a61867e041
--- /dev/null
+++ b/src/core/SkMatrixImageFilter.cpp
@@ -0,0 +1,148 @@
+/*
+ * 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