| /* |
| * 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 "SkResizeImageFilter.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" |
| |
| SkResizeImageFilter::SkResizeImageFilter(SkScalar sx, SkScalar sy, SkPaint::FilterLevel filterLevel, |
| SkImageFilter* input) |
| : INHERITED(input), |
| fSx(sx), |
| fSy(sy), |
| fFilterLevel(filterLevel) { |
| } |
| |
| SkResizeImageFilter::SkResizeImageFilter(SkReadBuffer& buffer) |
| : INHERITED(1, buffer) { |
| fSx = buffer.readScalar(); |
| fSy = buffer.readScalar(); |
| fFilterLevel = static_cast<SkPaint::FilterLevel>(buffer.readInt()); |
| } |
| |
| void SkResizeImageFilter::flatten(SkWriteBuffer& buffer) const { |
| this->INHERITED::flatten(buffer); |
| buffer.writeScalar(fSx); |
| buffer.writeScalar(fSy); |
| buffer.writeInt(fFilterLevel); |
| } |
| |
| SkResizeImageFilter::~SkResizeImageFilter() { |
| } |
| |
| bool SkResizeImageFilter::onFilterImage(Proxy* proxy, |
| const SkBitmap& source, |
| const SkMatrix& ctm, |
| SkBitmap* result, |
| SkIPoint* offset) const { |
| SkBitmap src = source; |
| SkIPoint srcOffset = SkIPoint::Make(0, 0); |
| if (getInput(0) && !getInput(0)->filterImage(proxy, source, ctm, &src, &srcOffset)) { |
| return false; |
| } |
| |
| SkRect dstRect; |
| SkIRect srcBounds, dstBounds; |
| src.getBounds(&srcBounds); |
| srcBounds.offset(srcOffset); |
| SkRect srcRect = SkRect::Make(srcBounds); |
| SkMatrix matrix; |
| if (!ctm.invert(&matrix)) { |
| return false; |
| } |
| matrix.postScale(fSx, fSy); |
| matrix.postConcat(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.scale(fSx, fSy); |
| SkPaint paint; |
| |
| paint.setXfermodeMode(SkXfermode::kSrc_Mode); |
| paint.setFilterLevel(fFilterLevel); |
| canvas.drawBitmap(src, srcRect.left(), srcRect.top(), &paint); |
| |
| *result = device.get()->accessBitmap(false); |
| offset->fX = dstBounds.fLeft; |
| offset->fY = dstBounds.fTop; |
| return true; |
| } |
| |
| void SkResizeImageFilter::computeFastBounds(const SkRect& src, SkRect* dst) const { |
| SkRect bounds = src; |
| if (getInput(0)) { |
| getInput(0)->computeFastBounds(src, &bounds); |
| } |
| dst->setXYWH(bounds.x(), bounds.y(), bounds.width() * fSx, bounds.height() * fSy); |
| } |
| |
| bool SkResizeImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix& ctm, |
| SkIRect* dst) const { |
| SkMatrix matrix; |
| if (!ctm.invert(&matrix)) { |
| return false; |
| } |
| matrix.postScale(SkScalarInvert(fSx), SkScalarInvert(fSy)); |
| matrix.postConcat(ctm); |
| SkRect floatBounds; |
| matrix.mapRect(&floatBounds, SkRect::Make(src)); |
| SkIRect bounds; |
| floatBounds.roundOut(&bounds); |
| if (getInput(0) && !getInput(0)->filterBounds(bounds, ctm, &bounds)) { |
| return false; |
| } |
| |
| *dst = bounds; |
| return true; |
| } |