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/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkAmbientShadowMaskFilter.h"
#include "SkReadBuffer.h"
#include "SkStringUtils.h"
#include "SkWriteBuffer.h"
#if SK_SUPPORT_GPU
#include "GrContext.h"
#include "GrRenderTargetContext.h"
#include "GrFragmentProcessor.h"
#include "GrStyle.h"
#include "GrTexture.h"
#include "GrTextureProxy.h"
#include "SkStrokeRec.h"
#endif
class SkAmbientShadowMaskFilterImpl : public SkMaskFilter {
public:
SkAmbientShadowMaskFilterImpl(SkScalar occluderHeight, SkScalar ambientAlpha, uint32_t flags);
// overrides from SkMaskFilter
SkMask::Format getFormat() const override;
bool filterMask(SkMask* dst, const SkMask& src, const SkMatrix&,
SkIPoint* margin) const override;
#if SK_SUPPORT_GPU
bool canFilterMaskGPU(const SkRRect& devRRect,
const SkIRect& clipBounds,
const SkMatrix& ctm,
SkRect* maskRect) const override;
bool directFilterMaskGPU(GrTextureProvider* texProvider,
GrRenderTargetContext* drawContext,
GrPaint&&,
const GrClip&,
const SkMatrix& viewMatrix,
const SkStrokeRec& strokeRec,
const SkPath& path) const override;
bool directFilterRRectMaskGPU(GrContext*,
GrRenderTargetContext* drawContext,
GrPaint&&,
const GrClip&,
const SkMatrix& viewMatrix,
const SkStrokeRec& strokeRec,
const SkRRect& rrect,
const SkRRect& devRRect) const override;
sk_sp<GrTextureProxy> filterMaskGPU(GrContext*,
sk_sp<GrTextureProxy> srcProxy,
const SkMatrix& ctm,
const SkIRect& maskRect) const override;
#endif
void computeFastBounds(const SkRect&, SkRect*) const override;
SK_TO_STRING_OVERRIDE()
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkAmbientShadowMaskFilterImpl)
private:
SkScalar fOccluderHeight;
SkScalar fAmbientAlpha;
uint32_t fFlags;
SkAmbientShadowMaskFilterImpl(SkReadBuffer&);
void flatten(SkWriteBuffer&) const override;
friend class SkAmbientShadowMaskFilter;
typedef SkMaskFilter INHERITED;
};
sk_sp<SkMaskFilter> SkAmbientShadowMaskFilter::Make(SkScalar occluderHeight, SkScalar ambientAlpha,
uint32_t flags) {
// add some param checks here for early exit
return sk_sp<SkMaskFilter>(new SkAmbientShadowMaskFilterImpl(occluderHeight, ambientAlpha,
flags));
}
///////////////////////////////////////////////////////////////////////////////////////////////////
SkAmbientShadowMaskFilterImpl::SkAmbientShadowMaskFilterImpl(SkScalar occluderHeight,
SkScalar ambientAlpha,
uint32_t flags)
: fOccluderHeight(occluderHeight)
, fAmbientAlpha(ambientAlpha)
, fFlags(flags) {
SkASSERT(fOccluderHeight > 0);
SkASSERT(fAmbientAlpha >= 0);
}
SkMask::Format SkAmbientShadowMaskFilterImpl::getFormat() const {
return SkMask::kA8_Format;
}
bool SkAmbientShadowMaskFilterImpl::filterMask(SkMask* dst, const SkMask& src,
const SkMatrix& matrix,
SkIPoint* margin) const {
// TODO something
return false;
}
void SkAmbientShadowMaskFilterImpl::computeFastBounds(const SkRect& src, SkRect* dst) const {
// TODO compute based on ambient data
dst->set(src.fLeft, src.fTop, src.fRight, src.fBottom);
}
sk_sp<SkFlattenable> SkAmbientShadowMaskFilterImpl::CreateProc(SkReadBuffer& buffer) {
const SkScalar occluderHeight = buffer.readScalar();
const SkScalar ambientAlpha = buffer.readScalar();
const uint32_t flags = buffer.readUInt();
return SkAmbientShadowMaskFilter::Make(occluderHeight, ambientAlpha, flags);
}
void SkAmbientShadowMaskFilterImpl::flatten(SkWriteBuffer& buffer) const {
buffer.writeScalar(fOccluderHeight);
buffer.writeScalar(fAmbientAlpha);
buffer.writeUInt(fFlags);
}
#if SK_SUPPORT_GPU
///////////////////////////////////////////////////////////////////////////////////////////////////
bool SkAmbientShadowMaskFilterImpl::canFilterMaskGPU(const SkRRect& devRRect,
const SkIRect& clipBounds,
const SkMatrix& ctm,
SkRect* maskRect) const {
// TODO
*maskRect = devRRect.rect();
return true;
}
static const float kHeightFactor = 1.0f / 128.0f;
static const float kGeomFactor = 64.0f;
bool SkAmbientShadowMaskFilterImpl::directFilterMaskGPU(GrTextureProvider* texProvider,
GrRenderTargetContext* rtContext,
GrPaint&& paint,
const GrClip& clip,
const SkMatrix& viewMatrix,
const SkStrokeRec& strokeRec,
const SkPath& path) const {
SkASSERT(rtContext);
// TODO: this will not handle local coordinates properly
if (fAmbientAlpha <= 0.0f) {
return true;
}
// only convex paths for now
if (!path.isConvex()) {
return false;
}
if (strokeRec.getStyle() != SkStrokeRec::kFill_Style) {
return false;
}
// if circle
// TODO: switch to SkScalarNearlyEqual when either oval renderer is updated or we
// have our own GeometryProc.
if (path.isOval(nullptr) && path.getBounds().width() == path.getBounds().height()) {
SkRRect rrect = SkRRect::MakeOval(path.getBounds());
return this->directFilterRRectMaskGPU(nullptr, rtContext, std::move(paint), clip,
SkMatrix::I(), strokeRec, rrect, rrect);
} else if (path.isRect(nullptr)) {
SkRRect rrect = SkRRect::MakeRect(path.getBounds());
return this->directFilterRRectMaskGPU(nullptr, rtContext, std::move(paint), clip,
SkMatrix::I(), strokeRec, rrect, rrect);
}
// TODO
return false;
}
bool SkAmbientShadowMaskFilterImpl::directFilterRRectMaskGPU(GrContext*,
GrRenderTargetContext* rtContext,
GrPaint&& paint,
const GrClip& clip,
const SkMatrix& viewMatrix,
const SkStrokeRec& strokeRec,
const SkRRect& rrect,
const SkRRect& devRRect) const {
// It's likely the caller has already done these checks, but we have to be sure.
// TODO: support analytic blurring of general rrect
// Fast path only supports filled rrects for now.
// TODO: fill and stroke as well.
if (SkStrokeRec::kFill_Style != strokeRec.getStyle()) {
return false;
}
// Fast path only supports simple rrects with circular corners.
SkASSERT(devRRect.allCornersCircular());
if (!rrect.isRect() && !rrect.isOval() && !rrect.isSimple()) {
return false;
}
// Fast path only supports uniform scale.
SkScalar scaleFactors[2];
if (!viewMatrix.getMinMaxScales(scaleFactors)) {
// matrix is degenerate
return false;
}
if (scaleFactors[0] != scaleFactors[1]) {
return false;
}
SkScalar scaleFactor = scaleFactors[0];
// For all of these, we need to ensure we have a rrect with radius >= 0.5f in device space
const SkScalar minRadius = 0.5f / scaleFactor;
bool isRect = rrect.getSimpleRadii().fX <= minRadius;
// TODO: take flags into account when generating shadow data
if (fAmbientAlpha > 0.0f) {
SkScalar srcSpaceAmbientRadius = fOccluderHeight * kHeightFactor * kGeomFactor;
const float umbraAlpha = (1.0f + SkTMax(fOccluderHeight * kHeightFactor, 0.0f));
const SkScalar ambientOffset = srcSpaceAmbientRadius / umbraAlpha;
// For the ambient rrect, we inset the offset rect by half the srcSpaceAmbientRadius
// to get our stroke shape.
SkScalar ambientPathOutset = SkTMax(ambientOffset - srcSpaceAmbientRadius * 0.5f,
minRadius);
SkRRect ambientRRect;
if (isRect) {
const SkRect temp = rrect.rect().makeOutset(ambientPathOutset, ambientPathOutset);
ambientRRect = SkRRect::MakeRectXY(temp, ambientPathOutset, ambientPathOutset);
} else {
rrect.outset(ambientPathOutset, ambientPathOutset, &ambientRRect);
}
const SkScalar devSpaceAmbientRadius = srcSpaceAmbientRadius * scaleFactor;
GrPaint newPaint(paint);
GrColor4f color = newPaint.getColor4f();
color.fRGBA[3] *= fAmbientAlpha;
newPaint.setColor4f(color);
SkStrokeRec ambientStrokeRec(SkStrokeRec::kHairline_InitStyle);
ambientStrokeRec.setStrokeStyle(srcSpaceAmbientRadius, false);
rtContext->drawShadowRRect(clip, std::move(newPaint), viewMatrix, ambientRRect,
devSpaceAmbientRadius,
GrStyle(ambientStrokeRec, nullptr));
}
return true;
}
sk_sp<GrTextureProxy> SkAmbientShadowMaskFilterImpl::filterMaskGPU(GrContext*,
sk_sp<GrTextureProxy> srcProxy,
const SkMatrix& ctm,
const SkIRect& maskRect) const {
// This filter is generative and doesn't operate on pre-existing masks
return nullptr;
}
#endif // SK_SUPPORT_GPU
#ifndef SK_IGNORE_TO_STRING
void SkAmbientShadowMaskFilterImpl::toString(SkString* str) const {
str->append("SkAmbientShadowMaskFilterImpl: (");
str->append("occluderHeight: ");
str->appendScalar(fOccluderHeight);
str->append(" ");
str->append("ambientAlpha: ");
str->appendScalar(fAmbientAlpha);
str->append(" ");
str->append("flags: (");
if (fFlags) {
bool needSeparator = false;
SkAddFlagToString(str,
SkToBool(fFlags & SkShadowFlags::kTransparentOccluder_ShadowFlag),
"TransparentOccluder", &needSeparator);
SkAddFlagToString(str,
SkToBool(fFlags & SkShadowFlags::kGaussianEdge_ShadowFlag),
"GaussianEdge", &needSeparator);
SkAddFlagToString(str,
SkToBool(fFlags & SkShadowFlags::kLargerUmbra_ShadowFlag),
"LargerUmbra", &needSeparator);
} else {
str->append("None");
}
str->append("))");
}
#endif
SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkAmbientShadowMaskFilter)
SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkAmbientShadowMaskFilterImpl)
SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END
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