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/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrClipMaskCache_DEFINED
#define GrClipMaskCache_DEFINED
#include "GrContext.h"
#include "SkClipStack.h"
#include "SkTypes.h"
class GrTexture;
/**
* The stencil buffer stores the last clip path - providing a single entry
* "cache". This class provides similar functionality for AA clip paths
*/
class GrClipMaskCache : SkNoncopyable {
public:
GrClipMaskCache();
~GrClipMaskCache() {
while (!fStack.empty()) {
GrClipStackFrame* temp = (GrClipStackFrame*) fStack.back();
temp->~GrClipStackFrame();
fStack.pop_back();
}
}
bool canReuse(int32_t clipGenID, const SkIRect& bounds) {
SkASSERT(clipGenID != SkClipStack::kWideOpenGenID);
SkASSERT(clipGenID != SkClipStack::kEmptyGenID);
GrClipStackFrame* back = (GrClipStackFrame*) fStack.back();
// We could reuse the mask if bounds is a subset of last bounds. We'd have to communicate
// an offset to the caller.
if (back->fLastMask &&
!back->fLastMask->wasDestroyed() &&
back->fLastBound == bounds &&
back->fLastClipGenID == clipGenID) {
return true;
}
return false;
}
void reset() {
if (fStack.empty()) {
// SkASSERT(false);
return;
}
GrClipStackFrame* back = (GrClipStackFrame*) fStack.back();
back->reset();
}
/**
* After a "push" the clip state is entirely open. Currently, the
* entire clip stack will be re-rendered into a new clip mask.
* TODO: can we take advantage of the nested nature of the clips to
* reduce the mask creation cost?
*/
void push();
void pop() {
//SkASSERT(!fStack.empty());
if (!fStack.empty()) {
GrClipStackFrame* back = (GrClipStackFrame*) fStack.back();
back->~GrClipStackFrame();
fStack.pop_back();
}
}
int32_t getLastClipGenID() const {
if (fStack.empty()) {
return SkClipStack::kInvalidGenID;
}
return ((GrClipStackFrame*) fStack.back())->fLastClipGenID;
}
GrTexture* getLastMask() {
if (fStack.empty()) {
SkASSERT(false);
return NULL;
}
GrClipStackFrame* back = (GrClipStackFrame*) fStack.back();
return back->fLastMask;
}
const GrTexture* getLastMask() const {
if (fStack.empty()) {
SkASSERT(false);
return NULL;
}
GrClipStackFrame* back = (GrClipStackFrame*) fStack.back();
return back->fLastMask;
}
void acquireMask(int32_t clipGenID,
const GrTextureDesc& desc,
const SkIRect& bound) {
if (fStack.empty()) {
SkASSERT(false);
return;
}
GrClipStackFrame* back = (GrClipStackFrame*) fStack.back();
back->acquireMask(fContext, clipGenID, desc, bound);
}
int getLastMaskWidth() const {
if (fStack.empty()) {
SkASSERT(false);
return -1;
}
GrClipStackFrame* back = (GrClipStackFrame*) fStack.back();
if (NULL == back->fLastMask) {
return -1;
}
return back->fLastMask->width();
}
int getLastMaskHeight() const {
if (fStack.empty()) {
SkASSERT(false);
return -1;
}
GrClipStackFrame* back = (GrClipStackFrame*) fStack.back();
if (NULL == back->fLastMask) {
return -1;
}
return back->fLastMask->height();
}
void getLastBound(SkIRect* bound) const {
if (fStack.empty()) {
SkASSERT(false);
bound->setEmpty();
return;
}
GrClipStackFrame* back = (GrClipStackFrame*) fStack.back();
*bound = back->fLastBound;
}
void setContext(GrContext* context) {
fContext = context;
}
GrContext* getContext() {
return fContext;
}
// TODO: Remove this when we hold cache keys instead of refs to textures.
void purgeResources() {
SkDeque::F2BIter iter(fStack);
for (GrClipStackFrame* frame = (GrClipStackFrame*) iter.next();
frame != NULL;
frame = (GrClipStackFrame*) iter.next()) {
frame->reset();
}
}
private:
struct GrClipStackFrame {
GrClipStackFrame() {
this->reset();
}
void acquireMask(GrContext* context,
int32_t clipGenID,
const GrTextureDesc& desc,
const SkIRect& bound) {
fLastClipGenID = clipGenID;
// HACK: set the last param to true to indicate that this request is at
// flush time and therefore we require a scratch texture with no pending IO operations.
fLastMask.reset(context->refScratchTexture(desc, GrContext::kApprox_ScratchTexMatch,
/*flushing=*/true));
fLastBound = bound;
}
void reset () {
fLastClipGenID = SkClipStack::kInvalidGenID;
GrTextureDesc desc;
fLastMask.reset(NULL);
fLastBound.setEmpty();
}
int32_t fLastClipGenID;
// The mask's width & height values are used by GrClipMaskManager to correctly scale the
// texture coords for the geometry drawn with this mask. TODO: This should be a cache key
// and not a hard ref to a texture.
SkAutoTUnref<GrTexture> fLastMask;
// fLastBound stores the bounding box of the clip mask in clip-stack space. This rect is
// used by GrClipMaskManager to position a rect and compute texture coords for the mask.
SkIRect fLastBound;
};
GrContext* fContext;
SkDeque fStack;
typedef SkNoncopyable INHERITED;
};
#endif // GrClipMaskCache_DEFINED
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