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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkBlurDrawLooper.h"
#include "SkBlurMask.h" // just for SkBlurMask::ConvertRadiusToSigma
#include "SkBlurMaskFilter.h"
#include "SkCanvas.h"
#include "SkColorFilter.h"
#include "SkReadBuffer.h"
#include "SkWriteBuffer.h"
#include "SkMaskFilter.h"
#include "SkPaint.h"
#include "SkString.h"
#include "SkStringUtils.h"
SkBlurDrawLooper::SkBlurDrawLooper(SkColor color, SkScalar sigma,
SkScalar dx, SkScalar dy, uint32_t flags) {
this->init(sigma, dx, dy, color, flags);
}
// only call from constructor
void SkBlurDrawLooper::initEffects() {
SkASSERT(fBlurFlags <= kAll_BlurFlag);
if (fSigma > 0) {
uint32_t flags = fBlurFlags & kIgnoreTransform_BlurFlag ?
SkBlurMaskFilter::kIgnoreTransform_BlurFlag :
SkBlurMaskFilter::kNone_BlurFlag;
flags |= fBlurFlags & kHighQuality_BlurFlag ?
SkBlurMaskFilter::kHighQuality_BlurFlag :
SkBlurMaskFilter::kNone_BlurFlag;
fBlur = SkBlurMaskFilter::Create(kNormal_SkBlurStyle, fSigma, flags);
} else {
fBlur = NULL;
}
if (fBlurFlags & kOverrideColor_BlurFlag) {
// Set alpha to 1 for the override since transparency will already
// be baked into the blurred mask.
SkColor opaqueColor = SkColorSetA(fBlurColor, 255);
//The SrcIn xfer mode will multiply 'color' by the incoming alpha
fColorFilter = SkColorFilter::CreateModeFilter(opaqueColor,
SkXfermode::kSrcIn_Mode);
} else {
fColorFilter = NULL;
}
}
void SkBlurDrawLooper::init(SkScalar sigma, SkScalar dx, SkScalar dy,
SkColor color, uint32_t flags) {
fSigma = sigma;
fDx = dx;
fDy = dy;
fBlurColor = color;
fBlurFlags = flags;
this->initEffects();
}
SkFlattenable* SkBlurDrawLooper::CreateProc(SkReadBuffer& buffer) {
const SkColor color = buffer.readColor();
const SkScalar sigma = buffer.readScalar();
const SkScalar dx = buffer.readScalar();
const SkScalar dy = buffer.readScalar();
const uint32_t flags = buffer.read32();
return Create(color, sigma, dx, dy, flags);
}
void SkBlurDrawLooper::flatten(SkWriteBuffer& buffer) const {
buffer.writeColor(fBlurColor);
buffer.writeScalar(fSigma);
buffer.writeScalar(fDx);
buffer.writeScalar(fDy);
buffer.write32(fBlurFlags);
}
SkBlurDrawLooper::~SkBlurDrawLooper() {
SkSafeUnref(fBlur);
SkSafeUnref(fColorFilter);
}
bool SkBlurDrawLooper::asABlurShadow(BlurShadowRec* rec) const {
if (fSigma <= 0 || (fBlurFlags & fBlurFlags & kIgnoreTransform_BlurFlag)) {
return false;
}
if (rec) {
rec->fSigma = fSigma;
rec->fColor = fBlurColor;
rec->fOffset.set(fDx, fDy);
rec->fStyle = kNormal_SkBlurStyle;
rec->fQuality = (fBlurFlags & kHighQuality_BlurFlag) ?
kHigh_SkBlurQuality : kLow_SkBlurQuality;
}
return true;
}
////////////////////////////////////////////////////////////////////////////////////////
SkDrawLooper::Context* SkBlurDrawLooper::createContext(SkCanvas*, void* storage) const {
return new (storage) BlurDrawLooperContext(this);
}
SkBlurDrawLooper::BlurDrawLooperContext::BlurDrawLooperContext(
const SkBlurDrawLooper* looper)
: fLooper(looper), fState(SkBlurDrawLooper::kBeforeEdge) {}
bool SkBlurDrawLooper::BlurDrawLooperContext::next(SkCanvas* canvas,
SkPaint* paint) {
switch (fState) {
case kBeforeEdge:
// we do nothing if a maskfilter is already installed
if (paint->getMaskFilter()) {
fState = kDone;
return false;
}
#ifdef SK_BUILD_FOR_ANDROID
SkColor blurColor;
blurColor = fLooper->fBlurColor;
if (SkColorGetA(blurColor) == 255) {
blurColor = SkColorSetA(blurColor, paint->getAlpha());
}
paint->setColor(blurColor);
#else
paint->setColor(fLooper->fBlurColor);
#endif
paint->setMaskFilter(fLooper->fBlur);
paint->setColorFilter(fLooper->fColorFilter);
canvas->save();
if (fLooper->fBlurFlags & kIgnoreTransform_BlurFlag) {
SkMatrix transform(canvas->getTotalMatrix());
transform.postTranslate(fLooper->fDx, fLooper->fDy);
canvas->setMatrix(transform);
} else {
canvas->translate(fLooper->fDx, fLooper->fDy);
}
fState = kAfterEdge;
return true;
case kAfterEdge:
canvas->restore();
fState = kDone;
return true;
default:
SkASSERT(kDone == fState);
return false;
}
}
#ifndef SK_IGNORE_TO_STRING
void SkBlurDrawLooper::toString(SkString* str) const {
str->append("SkBlurDrawLooper: ");
str->append("dx: ");
str->appendScalar(fDx);
str->append(" dy: ");
str->appendScalar(fDy);
str->append(" color: ");
str->appendHex(fBlurColor);
str->append(" flags: (");
if (kNone_BlurFlag == fBlurFlags) {
str->append("None");
} else {
bool needsSeparator = false;
SkAddFlagToString(str, SkToBool(kIgnoreTransform_BlurFlag & fBlurFlags), "IgnoreTransform",
&needsSeparator);
SkAddFlagToString(str, SkToBool(kOverrideColor_BlurFlag & fBlurFlags), "OverrideColor",
&needsSeparator);
SkAddFlagToString(str, SkToBool(kHighQuality_BlurFlag & fBlurFlags), "HighQuality",
&needsSeparator);
}
str->append(")");
// TODO: add optional "fBlurFilter->toString(str);" when SkMaskFilter::toString is added
// alternatively we could cache the radius in SkBlurDrawLooper and just add it here
}
#endif
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