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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 "SkFlattenableBuffers.h"
#include "SkMaskFilter.h"
#include "SkPaint.h"
#include "SkString.h"
#include "SkStringUtils.h"
SkBlurDrawLooper::SkBlurDrawLooper(SkScalar radius, SkScalar dx, SkScalar dy,
SkColor color, uint32_t flags) {
this->init(SkBlurMask::ConvertRadiusToSigma(radius), dx, dy, color, flags);
}
SkBlurDrawLooper::SkBlurDrawLooper(SkColor color, SkScalar sigma,
SkScalar dx, SkScalar dy, uint32_t flags) {
this->init(sigma, dx, dy, color, flags);
}
void SkBlurDrawLooper::init(SkScalar sigma, SkScalar dx, SkScalar dy,
SkColor color, uint32_t flags) {
fDx = dx;
fDy = dy;
fBlurColor = color;
fBlurFlags = flags;
fState = kDone;
SkASSERT(flags <= kAll_BlurFlag);
if (sigma > 0) {
uint32_t blurFlags = flags & kIgnoreTransform_BlurFlag ?
SkBlurMaskFilter::kIgnoreTransform_BlurFlag :
SkBlurMaskFilter::kNone_BlurFlag;
blurFlags |= flags & kHighQuality_BlurFlag ?
SkBlurMaskFilter::kHighQuality_BlurFlag :
SkBlurMaskFilter::kNone_BlurFlag;
fBlur = SkBlurMaskFilter::Create(SkBlurMaskFilter::kNormal_BlurStyle,
sigma,
blurFlags);
} else {
fBlur = NULL;
}
if (flags & kOverrideColor_BlurFlag) {
// Set alpha to 1 for the override since transparency will already
// be baked into the blurred mask.
SkColor opaqueColor = SkColorSetA(color, 255);
//The SrcIn xfer mode will multiply 'color' by the incoming alpha
fColorFilter = SkColorFilter::CreateModeFilter(opaqueColor,
SkXfermode::kSrcIn_Mode);
} else {
fColorFilter = NULL;
}
}
SkBlurDrawLooper::SkBlurDrawLooper(SkFlattenableReadBuffer& buffer)
: INHERITED(buffer) {
fDx = buffer.readScalar();
fDy = buffer.readScalar();
fBlurColor = buffer.readColor();
fBlur = buffer.readMaskFilter();
fColorFilter = buffer.readColorFilter();
fBlurFlags = buffer.readUInt() & kAll_BlurFlag;
}
SkBlurDrawLooper::~SkBlurDrawLooper() {
SkSafeUnref(fBlur);
SkSafeUnref(fColorFilter);
}
void SkBlurDrawLooper::flatten(SkFlattenableWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writeScalar(fDx);
buffer.writeScalar(fDy);
buffer.writeColor(fBlurColor);
buffer.writeFlattenable(fBlur);
buffer.writeFlattenable(fColorFilter);
buffer.writeUInt(fBlurFlags);
}
void SkBlurDrawLooper::init(SkCanvas*) {
fState = kBeforeEdge;
}
bool SkBlurDrawLooper::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 = fBlurColor;
if (SkColorGetA(blurColor) == 255) {
blurColor = SkColorSetA(blurColor, paint->getAlpha());
}
paint->setColor(blurColor);
#else
paint->setColor(fBlurColor);
#endif
paint->setMaskFilter(fBlur);
paint->setColorFilter(fColorFilter);
canvas->save(SkCanvas::kMatrix_SaveFlag);
if (fBlurFlags & kIgnoreTransform_BlurFlag) {
SkMatrix transform(canvas->getTotalMatrix());
transform.postTranslate(fDx, fDy);
canvas->setMatrix(transform);
} else {
canvas->translate(fDx, fDy);
}
fState = kAfterEdge;
return true;
case kAfterEdge:
canvas->restore();
fState = kDone;
return true;
default:
SkASSERT(kDone == fState);
return false;
}
}
#ifdef SK_DEVELOPER
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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