| |
| /* |
| * Copyright 2006 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 "SkBlurMaskFilter.h" |
| #include "SkBlurMask.h" |
| #include "SkFlattenableBuffers.h" |
| #include "SkMaskFilter.h" |
| |
| class SkBlurMaskFilterImpl : public SkMaskFilter { |
| public: |
| SkBlurMaskFilterImpl(SkScalar radius, SkBlurMaskFilter::BlurStyle, |
| uint32_t flags); |
| |
| // overrides from SkMaskFilter |
| virtual SkMask::Format getFormat() const SK_OVERRIDE; |
| virtual bool filterMask(SkMask* dst, const SkMask& src, const SkMatrix&, |
| SkIPoint* margin) const SK_OVERRIDE; |
| virtual BlurType asABlur(BlurInfo*) const SK_OVERRIDE; |
| virtual void computeFastBounds(const SkRect&, SkRect*) const SK_OVERRIDE; |
| |
| SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkBlurMaskFilterImpl) |
| |
| protected: |
| virtual FilterReturn filterRectsToNine(const SkRect[], int count, const SkMatrix&, |
| const SkIRect& clipBounds, |
| NinePatch*) const SK_OVERRIDE; |
| |
| private: |
| SkScalar fRadius; |
| SkBlurMaskFilter::BlurStyle fBlurStyle; |
| uint32_t fBlurFlags; |
| |
| SkBlurMaskFilterImpl(SkFlattenableReadBuffer&); |
| virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE; |
| |
| typedef SkMaskFilter INHERITED; |
| }; |
| |
| SkMaskFilter* SkBlurMaskFilter::Create(SkScalar radius, |
| SkBlurMaskFilter::BlurStyle style, |
| uint32_t flags) { |
| // use !(radius > 0) instead of radius <= 0 to reject NaN values |
| if (!(radius > 0) || (unsigned)style >= SkBlurMaskFilter::kBlurStyleCount |
| || flags > SkBlurMaskFilter::kAll_BlurFlag) { |
| return NULL; |
| } |
| |
| return SkNEW_ARGS(SkBlurMaskFilterImpl, (radius, style, flags)); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| SkBlurMaskFilterImpl::SkBlurMaskFilterImpl(SkScalar radius, |
| SkBlurMaskFilter::BlurStyle style, |
| uint32_t flags) |
| : fRadius(radius), fBlurStyle(style), fBlurFlags(flags) { |
| #if 0 |
| fGamma = NULL; |
| if (gammaScale) { |
| fGamma = new U8[256]; |
| if (gammaScale > 0) |
| SkBlurMask::BuildSqrGamma(fGamma, gammaScale); |
| else |
| SkBlurMask::BuildSqrtGamma(fGamma, -gammaScale); |
| } |
| #endif |
| SkASSERT(radius >= 0); |
| SkASSERT((unsigned)style < SkBlurMaskFilter::kBlurStyleCount); |
| SkASSERT(flags <= SkBlurMaskFilter::kAll_BlurFlag); |
| } |
| |
| SkMask::Format SkBlurMaskFilterImpl::getFormat() const { |
| return SkMask::kA8_Format; |
| } |
| |
| bool SkBlurMaskFilterImpl::filterMask(SkMask* dst, const SkMask& src, |
| const SkMatrix& matrix, |
| SkIPoint* margin) const{ |
| SkScalar radius; |
| if (fBlurFlags & SkBlurMaskFilter::kIgnoreTransform_BlurFlag) { |
| radius = fRadius; |
| } else { |
| radius = matrix.mapRadius(fRadius); |
| } |
| |
| // To avoid unseemly allocation requests (esp. for finite platforms like |
| // handset) we limit the radius so something manageable. (as opposed to |
| // a request like 10,000) |
| static const SkScalar MAX_RADIUS = SkIntToScalar(128); |
| radius = SkMinScalar(radius, MAX_RADIUS); |
| SkBlurMask::Quality blurQuality = |
| (fBlurFlags & SkBlurMaskFilter::kHighQuality_BlurFlag) ? |
| SkBlurMask::kHigh_Quality : SkBlurMask::kLow_Quality; |
| |
| #ifndef SK_DISABLE_SEPARABLE_MASK_BLUR |
| return SkBlurMask::BlurSeparable(dst, src, radius, (SkBlurMask::Style)fBlurStyle, |
| blurQuality, margin); |
| #else |
| return SkBlurMask::Blur(dst, src, radius, (SkBlurMask::Style)fBlurStyle, |
| blurQuality, margin); |
| #endif |
| } |
| |
| #include "SkCanvas.h" |
| |
| static bool drawRectsIntoMask(const SkRect rects[], int count, SkMask* mask) { |
| rects[0].roundOut(&mask->fBounds); |
| mask->fRowBytes = SkAlign4(mask->fBounds.width()); |
| mask->fFormat = SkMask::kA8_Format; |
| size_t size = mask->computeImageSize(); |
| mask->fImage = SkMask::AllocImage(size); |
| if (NULL == mask->fImage) { |
| return false; |
| } |
| sk_bzero(mask->fImage, size); |
| |
| SkBitmap bitmap; |
| bitmap.setConfig(SkBitmap::kA8_Config, |
| mask->fBounds.width(), mask->fBounds.height(), |
| mask->fRowBytes); |
| bitmap.setPixels(mask->fImage); |
| |
| SkCanvas canvas(bitmap); |
| canvas.translate(-SkIntToScalar(mask->fBounds.left()), |
| -SkIntToScalar(mask->fBounds.top())); |
| |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| |
| if (1 == count) { |
| canvas.drawRect(rects[0], paint); |
| } else { |
| // todo: do I need a fast way to do this? |
| SkPath path; |
| path.addRect(rects[0]); |
| path.addRect(rects[1]); |
| path.setFillType(SkPath::kEvenOdd_FillType); |
| canvas.drawPath(path, paint); |
| } |
| return true; |
| } |
| |
| static bool rect_exceeds(const SkRect& r, SkScalar v) { |
| return r.fLeft < -v || r.fTop < -v || r.fRight > v || r.fBottom > v || |
| r.width() > v || r.height() > v; |
| } |
| |
| SkMaskFilter::FilterReturn |
| SkBlurMaskFilterImpl::filterRectsToNine(const SkRect rects[], int count, |
| const SkMatrix& matrix, |
| const SkIRect& clipBounds, |
| NinePatch* patch) const { |
| if (count < 1 || count > 2) { |
| return kUnimplemented_FilterReturn; |
| } |
| |
| // TODO: report correct metrics for innerstyle, where we do not grow the |
| // total bounds, but we do need an inset the size of our blur-radius |
| if (SkBlurMaskFilter::kInner_BlurStyle == fBlurStyle) { |
| return kUnimplemented_FilterReturn; |
| } |
| |
| // TODO: take clipBounds into account to limit our coordinates up front |
| // for now, just skip too-large src rects (to take the old code path). |
| if (rect_exceeds(rects[0], SkIntToScalar(32767))) { |
| return kUnimplemented_FilterReturn; |
| } |
| |
| SkIPoint margin; |
| SkMask srcM, dstM; |
| rects[0].roundOut(&srcM.fBounds); |
| srcM.fImage = NULL; |
| srcM.fFormat = SkMask::kA8_Format; |
| srcM.fRowBytes = 0; |
| if (!this->filterMask(&dstM, srcM, matrix, &margin)) { |
| return kFalse_FilterReturn; |
| } |
| |
| /* |
| * smallR is the smallest version of 'rect' that will still guarantee that |
| * we get the same blur results on all edges, plus 1 center row/col that is |
| * representative of the extendible/stretchable edges of the ninepatch. |
| * Since our actual edge may be fractional we inset 1 more to be sure we |
| * don't miss any interior blur. |
| * x is an added pixel of blur, and { and } are the (fractional) edge |
| * pixels from the original rect. |
| * |
| * x x { x x .... x x } x x |
| * |
| * Thus, in this case, we inset by a total of 5 (on each side) beginning |
| * with our outer-rect (dstM.fBounds) |
| */ |
| SkRect smallR[2]; |
| SkIPoint center; |
| |
| // +2 is from +1 for each edge (to account for possible fractional edges |
| int smallW = dstM.fBounds.width() - srcM.fBounds.width() + 2; |
| int smallH = dstM.fBounds.height() - srcM.fBounds.height() + 2; |
| SkIRect innerIR; |
| |
| if (1 == count) { |
| innerIR = srcM.fBounds; |
| center.set(smallW, smallH); |
| } else { |
| SkASSERT(2 == count); |
| rects[1].roundIn(&innerIR); |
| center.set(smallW + (innerIR.left() - srcM.fBounds.left()), |
| smallH + (innerIR.top() - srcM.fBounds.top())); |
| } |
| |
| // +1 so we get a clean, stretchable, center row/col |
| smallW += 1; |
| smallH += 1; |
| |
| // we want the inset amounts to be integral, so we don't change any |
| // fractional phase on the fRight or fBottom of our smallR. |
| const SkScalar dx = SkIntToScalar(innerIR.width() - smallW); |
| const SkScalar dy = SkIntToScalar(innerIR.height() - smallH); |
| if (dx < 0 || dy < 0) { |
| // we're too small, relative to our blur, to break into nine-patch, |
| // so we ask to have our normal filterMask() be called. |
| return kUnimplemented_FilterReturn; |
| } |
| |
| smallR[0].set(rects[0].left(), rects[0].top(), rects[0].right() - dx, rects[0].bottom() - dy); |
| SkASSERT(!smallR[0].isEmpty()); |
| if (2 == count) { |
| smallR[1].set(rects[1].left(), rects[1].top(), |
| rects[1].right() - dx, rects[1].bottom() - dy); |
| SkASSERT(!smallR[1].isEmpty()); |
| } |
| |
| if (!drawRectsIntoMask(smallR, count, &srcM)) { |
| return kFalse_FilterReturn; |
| } |
| |
| SkAutoMaskFreeImage amf(srcM.fImage); |
| |
| if (!this->filterMask(&patch->fMask, srcM, matrix, &margin)) { |
| return kFalse_FilterReturn; |
| } |
| patch->fMask.fBounds.offsetTo(0, 0); |
| patch->fOuterRect = dstM.fBounds; |
| patch->fCenter = center; |
| return kTrue_FilterReturn; |
| } |
| |
| void SkBlurMaskFilterImpl::computeFastBounds(const SkRect& src, |
| SkRect* dst) const { |
| dst->set(src.fLeft - fRadius, src.fTop - fRadius, |
| src.fRight + fRadius, src.fBottom + fRadius); |
| } |
| |
| SkBlurMaskFilterImpl::SkBlurMaskFilterImpl(SkFlattenableReadBuffer& buffer) |
| : SkMaskFilter(buffer) { |
| fRadius = buffer.readScalar(); |
| fBlurStyle = (SkBlurMaskFilter::BlurStyle)buffer.readInt(); |
| fBlurFlags = buffer.readUInt() & SkBlurMaskFilter::kAll_BlurFlag; |
| SkASSERT(fRadius >= 0); |
| SkASSERT((unsigned)fBlurStyle < SkBlurMaskFilter::kBlurStyleCount); |
| } |
| |
| void SkBlurMaskFilterImpl::flatten(SkFlattenableWriteBuffer& buffer) const { |
| this->INHERITED::flatten(buffer); |
| buffer.writeScalar(fRadius); |
| buffer.writeInt(fBlurStyle); |
| buffer.writeUInt(fBlurFlags); |
| } |
| |
| static const SkMaskFilter::BlurType gBlurStyle2BlurType[] = { |
| SkMaskFilter::kNormal_BlurType, |
| SkMaskFilter::kSolid_BlurType, |
| SkMaskFilter::kOuter_BlurType, |
| SkMaskFilter::kInner_BlurType, |
| }; |
| |
| SkMaskFilter::BlurType SkBlurMaskFilterImpl::asABlur(BlurInfo* info) const { |
| if (info) { |
| info->fRadius = fRadius; |
| info->fIgnoreTransform = SkToBool(fBlurFlags & SkBlurMaskFilter::kIgnoreTransform_BlurFlag); |
| info->fHighQuality = SkToBool(fBlurFlags & SkBlurMaskFilter::kHighQuality_BlurFlag); |
| } |
| return gBlurStyle2BlurType[fBlurStyle]; |
| } |
| |
| SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkBlurMaskFilter) |
| SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkBlurMaskFilterImpl) |
| SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END |
