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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkMatrixClipStateMgr_DEFINED
#define SkMatrixClipStateMgr_DEFINED
#include "SkCanvas.h"
#include "SkMatrix.h"
#include "SkRegion.h"
#include "SkRRect.h"
#include "SkTypes.h"
#include "SkTDArray.h"
class SkPictureRecord;
class SkWriter32;
// The SkMatrixClipStateMgr collapses the matrix/clip state of an SkPicture into
// a series of save/restore blocks of consistent matrix clip state, e.g.:
//
// save
// clip(s)
// concat
// ... draw ops ...
// restore
//
// SaveLayers simply add another level, e.g.:
//
// save
// clip(s)
// concat
// ... draw ops ...
// saveLayer
// save
// clip(s)
// concat
// ... draw ops ...
// restore
// restore
// restore
//
// As a side effect of this process all saves and saveLayers will become
// kMatrixClip_SaveFlag style saves/saveLayers.
// The SkMatrixClipStateMgr works by intercepting all the save*, restore, clip*,
// and matrix calls sent to SkCanvas in order to track the current matrix/clip
// state. All the other canvas calls get funnelled into a generic "call" entry
// point that signals that a state block is required.
class SkMatrixClipStateMgr {
public:
static const int32_t kIdentityWideOpenStateID = 0;
static const int kIdentityMatID = 0;
class MatrixClipState {
public:
class MatrixInfo {
public:
void reset() {
fMatrixID = kIdentityMatID;
fMatrix.reset();
}
bool preTranslate(SkScalar dx, SkScalar dy) {
fMatrixID = -1;
return fMatrix.preTranslate(dx, dy);
}
bool preScale(SkScalar sx, SkScalar sy) {
fMatrixID = -1;
return fMatrix.preScale(sx, sy);
}
bool preRotate(SkScalar degrees) {
fMatrixID = -1;
return fMatrix.preRotate(degrees);
}
bool preSkew(SkScalar sx, SkScalar sy) {
fMatrixID = -1;
return fMatrix.preSkew(sx, sy);
}
bool preConcat(const SkMatrix& matrix) {
fMatrixID = -1;
return fMatrix.preConcat(matrix);
}
void setMatrix(const SkMatrix& matrix) {
fMatrixID = -1;
fMatrix = matrix;
}
int getID(SkMatrixClipStateMgr* mgr) {
if (fMatrixID >= 0) {
return fMatrixID;
}
fMatrixID = mgr->addMatToDict(fMatrix);
return fMatrixID;
}
private:
SkMatrix fMatrix;
int fMatrixID;
};
class ClipInfo : public SkNoncopyable {
public:
ClipInfo() {}
bool clipRect(const SkRect& rect,
SkRegion::Op op,
bool doAA,
int matrixID) {
ClipOp* newClip = fClips.append();
newClip->fClipType = kRect_ClipType;
newClip->fGeom.fRRect.setRect(rect); // storing the clipRect in the RRect
newClip->fOp = op;
newClip->fDoAA = doAA;
newClip->fMatrixID = matrixID;
return false;
}
bool clipRRect(const SkRRect& rrect,
SkRegion::Op op,
bool doAA,
int matrixID) {
ClipOp* newClip = fClips.append();
newClip->fClipType = kRRect_ClipType;
newClip->fGeom.fRRect = rrect;
newClip->fOp = op;
newClip->fDoAA = doAA;
newClip->fMatrixID = matrixID;
return false;
}
bool clipPath(SkPictureRecord* picRecord,
const SkPath& path,
SkRegion::Op op,
bool doAA,
int matrixID);
bool clipRegion(SkPictureRecord* picRecord,
int regionID,
SkRegion::Op op,
int matrixID);
void writeClip(int* curMatID, SkMatrixClipStateMgr* mgr);
SkDEBUGCODE(int numClips() const { return fClips.count(); })
private:
enum ClipType {
kRect_ClipType,
kRRect_ClipType,
kPath_ClipType,
kRegion_ClipType
};
class ClipOp {
public:
ClipType fClipType;
union {
SkRRect fRRect; // also stores clipRect
int fPathID;
int fRegionID;
} fGeom;
bool fDoAA;
SkRegion::Op fOp;
// The CTM in effect when this clip call was issued
int fMatrixID;
};
SkTDArray<ClipOp> fClips;
typedef SkNoncopyable INHERITED;
};
MatrixClipState(MatrixClipState* prev, int flags)
#ifdef SK_DEBUG
: fPrev(prev)
#endif
{
if (NULL == prev) {
fLayerID = 0;
fMatrixInfoStorage.reset();
fMatrixInfo = &fMatrixInfoStorage;
fClipInfo = &fClipInfoStorage; // ctor handles init of fClipInfoStorage
// The identity/wide-open-clip state is current by default
fMCStateID = kIdentityWideOpenStateID;
}
else {
fLayerID = prev->fLayerID;
if (flags & SkCanvas::kMatrix_SaveFlag) {
fMatrixInfoStorage = *prev->fMatrixInfo;
fMatrixInfo = &fMatrixInfoStorage;
} else {
fMatrixInfo = prev->fMatrixInfo;
}
if (flags & SkCanvas::kClip_SaveFlag) {
// We don't copy the ClipOps of the previous clip states
fClipInfo = &fClipInfoStorage;
} else {
fClipInfo = prev->fClipInfo;
}
// Initially a new save/saveLayer represents the same MC state
// as its predecessor.
fMCStateID = prev->fMCStateID;
}
fIsSaveLayer = false;
}
MatrixInfo* fMatrixInfo;
MatrixInfo fMatrixInfoStorage;
ClipInfo* fClipInfo;
ClipInfo fClipInfoStorage;
// Tracks the current depth of saveLayers to support the isDrawingToLayer call
int fLayerID;
// Does this MC state represent a saveLayer call?
bool fIsSaveLayer;
// The next two fields are only valid when fIsSaveLayer is set.
int32_t fSaveLayerBaseStateID;
SkTDArray<int>* fSavedSkipOffsets;
#ifdef SK_DEBUG
MatrixClipState* fPrev; // debugging aid
#endif
int32_t fMCStateID;
};
enum CallType {
kMatrix_CallType,
kClip_CallType,
kOther_CallType
};
SkMatrixClipStateMgr();
~SkMatrixClipStateMgr();
void init(SkPictureRecord* picRecord) {
// Note: we're not taking a ref here. It is expected that the SkMatrixClipStateMgr
// is owned by the SkPictureRecord object
fPicRecord = picRecord;
}
SkPictureRecord* getPicRecord() { return fPicRecord; }
// TODO: need to override canvas' getSaveCount. Right now we pass the
// save* and restore calls on to the base SkCanvas in SkPictureRecord but
// this duplicates effort.
int getSaveCount() const { return fMatrixClipStack.count(); }
int save(SkCanvas::SaveFlags flags);
int saveLayer(const SkRect* bounds, const SkPaint* paint, SkCanvas::SaveFlags flags);
bool isDrawingToLayer() const {
return fCurMCState->fLayerID > 0;
}
void restore();
bool translate(SkScalar dx, SkScalar dy) {
this->call(kMatrix_CallType);
return fCurMCState->fMatrixInfo->preTranslate(dx, dy);
}
bool scale(SkScalar sx, SkScalar sy) {
this->call(kMatrix_CallType);
return fCurMCState->fMatrixInfo->preScale(sx, sy);
}
bool rotate(SkScalar degrees) {
this->call(kMatrix_CallType);
return fCurMCState->fMatrixInfo->preRotate(degrees);
}
bool skew(SkScalar sx, SkScalar sy) {
this->call(kMatrix_CallType);
return fCurMCState->fMatrixInfo->preSkew(sx, sy);
}
bool concat(const SkMatrix& matrix) {
this->call(kMatrix_CallType);
return fCurMCState->fMatrixInfo->preConcat(matrix);
}
void setMatrix(const SkMatrix& matrix) {
this->call(kMatrix_CallType);
fCurMCState->fMatrixInfo->setMatrix(matrix);
}
bool clipRect(const SkRect& rect, SkRegion::Op op, bool doAA) {
this->call(SkMatrixClipStateMgr::kClip_CallType);
return fCurMCState->fClipInfo->clipRect(rect, op, doAA,
fCurMCState->fMatrixInfo->getID(this));
}
bool clipRRect(const SkRRect& rrect, SkRegion::Op op, bool doAA) {
this->call(SkMatrixClipStateMgr::kClip_CallType);
return fCurMCState->fClipInfo->clipRRect(rrect, op, doAA,
fCurMCState->fMatrixInfo->getID(this));
}
bool clipPath(const SkPath& path, SkRegion::Op op, bool doAA) {
this->call(SkMatrixClipStateMgr::kClip_CallType);
return fCurMCState->fClipInfo->clipPath(fPicRecord, path, op, doAA,
fCurMCState->fMatrixInfo->getID(this));
}
bool clipRegion(const SkRegion& region, SkRegion::Op op) {
this->call(SkMatrixClipStateMgr::kClip_CallType);
int regionID = this->addRegionToDict(region);
return fCurMCState->fClipInfo->clipRegion(fPicRecord, regionID, op,
fCurMCState->fMatrixInfo->getID(this));
}
bool call(CallType callType);
void fillInSkips(SkWriter32* writer, int32_t restoreOffset);
void finish();
protected:
SkPictureRecord* fPicRecord;
uint32_t fMatrixClipStackStorage[43]; // sized to fit 2 clip states
SkDeque fMatrixClipStack;
MatrixClipState* fCurMCState;
// This dictionary doesn't actually de-duplicate the matrices (except for the
// identity matrix). It merely stores the matrices and allows them to be looked
// up by ID later. The de-duplication mainly falls upon the matrix/clip stack
// which stores the ID so a revisited clip/matrix (via popping the stack) will
// use the same ID.
SkTDArray<SkMatrix> fMatrixDict;
SkTDArray<SkRegion*> fRegionDict;
// The MCStateID of the state currently in effect in the byte stream. 0 if none.
int32_t fCurOpenStateID;
// The skip offsets for the current open state. These are the locations in the
// skp that must be filled in when the current open state is closed. These are
// here rather then distributed across the MatrixClipState's because saveLayers
// can cause MC states to be nested.
SkTDArray<int32_t> *fSkipOffsets;
SkDEBUGCODE(void validate();)
int MCStackPush(SkCanvas::SaveFlags flags);
void addClipOffset(int offset) {
SkASSERT(NULL != fSkipOffsets);
SkASSERT(kIdentityWideOpenStateID != fCurOpenStateID);
*fSkipOffsets->append() = offset;
}
void writeDeltaMat(int currentMatID, int desiredMatID);
static int32_t NewMCStateID();
int addRegionToDict(const SkRegion& region);
const SkRegion* lookupRegion(int index) {
SkASSERT(index >= 0 && index < fRegionDict.count());
return fRegionDict[index];
}
// TODO: add stats to check if the dictionary really does
// reduce the size of the SkPicture.
int addMatToDict(const SkMatrix& mat);
const SkMatrix& lookupMat(int index) {
SkASSERT(index >= 0 && index < fMatrixDict.count());
return fMatrixDict[index];
}
};
#endif
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