| /* |
| * 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 { |
| SkImageFilter* input = getInput(0); |
| SkBitmap src = source; |
| SkIPoint srcOffset = SkIPoint::Make(0, 0); |
| #ifdef SK_DISABLE_OFFSETIMAGEFILTER_OPTIMIZATION |
| if (false) { |
| #else |
| if (!cropRectIsSet()) { |
| #endif |
| if (input && !input->filterImage(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 (input && !input->filterImage(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 (NULL == 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; |
| } |
| SkRect copy = *dst; |
| dst->offset(fOffset.fX, fOffset.fY); |
| dst->join(copy); |
| } |
| |
| bool SkOffsetImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix& ctm, |
| SkIRect* dst) const { |
| SkVector vec; |
| ctm.mapVectors(&vec, &fOffset, 1); |
| |
| SkIRect bounds = src; |
| bounds.offset(-SkScalarCeilToInt(vec.fX), -SkScalarCeilToInt(vec.fY)); |
| bounds.join(src); |
| if (getInput(0)) { |
| return getInput(0)->filterBounds(bounds, ctm, dst); |
| } |
| *dst = bounds; |
| return true; |
| } |
| |
| 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(input, cropRect) { |
| fOffset.set(dx, dy); |
| } |
| |
| SkOffsetImageFilter::SkOffsetImageFilter(SkReadBuffer& buffer) |
| : INHERITED(1, buffer) { |
| buffer.readPoint(&fOffset); |
| buffer.validate(SkScalarIsFinite(fOffset.fX) && |
| SkScalarIsFinite(fOffset.fY)); |
| } |