| /* |
| * Copyright 2012 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 "SkOffsetImageFilter.h" |
| #include "SkBitmap.h" |
| #include "SkCanvas.h" |
| #include "SkDevice.h" |
| #include "SkReadBuffer.h" |
| #include "SkWriteBuffer.h" |
| #include "SkMatrix.h" |
| #include "SkPaint.h" |
| |
| bool SkOffsetImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& source, |
| const Context& ctx, |
| SkBitmap* result, |
| SkIPoint* offset) const { |
| SkBitmap src = source; |
| SkIPoint srcOffset = SkIPoint::Make(0, 0); |
| if (!cropRectIsSet()) { |
| if (!this->filterInput(0, proxy, source, ctx, &src, &srcOffset)) { |
| return false; |
| } |
| |
| SkVector vec; |
| ctx.ctm().mapVectors(&vec, &fOffset, 1); |
| |
| offset->fX = srcOffset.fX + SkScalarRoundToInt(vec.fX); |
| offset->fY = srcOffset.fY + SkScalarRoundToInt(vec.fY); |
| *result = src; |
| } else { |
| if (!this->filterInput(0, proxy, source, ctx, &src, &srcOffset)) { |
| return false; |
| } |
| |
| SkIRect bounds; |
| if (!this->applyCropRect(ctx, src, srcOffset, &bounds)) { |
| return false; |
| } |
| |
| SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(bounds.width(), bounds.height())); |
| if (nullptr == device.get()) { |
| return false; |
| } |
| SkCanvas canvas(device); |
| SkPaint paint; |
| paint.setXfermodeMode(SkXfermode::kSrc_Mode); |
| canvas.translate(SkIntToScalar(srcOffset.fX - bounds.fLeft), |
| SkIntToScalar(srcOffset.fY - bounds.fTop)); |
| SkVector vec; |
| ctx.ctm().mapVectors(&vec, &fOffset, 1); |
| canvas.drawBitmap(src, vec.x(), vec.y(), &paint); |
| *result = device->accessBitmap(false); |
| offset->fX = bounds.fLeft; |
| offset->fY = bounds.fTop; |
| } |
| return true; |
| } |
| |
| void SkOffsetImageFilter::computeFastBounds(const SkRect& src, SkRect* dst) const { |
| if (getInput(0)) { |
| getInput(0)->computeFastBounds(src, dst); |
| } else { |
| *dst = src; |
| } |
| dst->offset(fOffset.fX, fOffset.fY); |
| } |
| |
| void SkOffsetImageFilter::onFilterNodeBounds(const SkIRect& src, const SkMatrix& ctm, |
| SkIRect* dst, MapDirection direction) const { |
| SkVector vec; |
| ctm.mapVectors(&vec, &fOffset, 1); |
| if (kReverse_MapDirection == direction) { |
| vec.negate(); |
| } |
| |
| *dst = src; |
| dst->offset(SkScalarCeilToInt(vec.fX), SkScalarCeilToInt(vec.fY)); |
| } |
| |
| SkFlattenable* SkOffsetImageFilter::CreateProc(SkReadBuffer& buffer) { |
| SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1); |
| SkPoint offset; |
| buffer.readPoint(&offset); |
| return Create(offset.x(), offset.y(), common.getInput(0), &common.cropRect()); |
| } |
| |
| void SkOffsetImageFilter::flatten(SkWriteBuffer& buffer) const { |
| this->INHERITED::flatten(buffer); |
| buffer.writePoint(fOffset); |
| } |
| |
| SkOffsetImageFilter::SkOffsetImageFilter(SkScalar dx, SkScalar dy, SkImageFilter* input, |
| const CropRect* cropRect) |
| : INHERITED(1, &input, cropRect) { |
| fOffset.set(dx, dy); |
| } |
| |
| #ifndef SK_IGNORE_TO_STRING |
| void SkOffsetImageFilter::toString(SkString* str) const { |
| str->appendf("SkOffsetImageFilter: ("); |
| str->appendf("offset: (%f, %f) ", fOffset.fX, fOffset.fY); |
| str->append("input: ("); |
| if (this->getInput(0)) { |
| this->getInput(0)->toString(str); |
| } |
| str->append("))"); |
| } |
| #endif |