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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkCanvas.h"
#include "SkTLazy.h"
#include "SkMiniRecorder.h"
#include "SkOnce.h"
#include "SkPicture.h"
#include "SkPictureCommon.h"
#include "SkRecordDraw.h"
#include "SkTextBlob.h"
using namespace SkRecords;
class SkEmptyPicture final : public SkPicture {
public:
void playback(SkCanvas*, AbortCallback*) const override { }
size_t approximateBytesUsed() const override { return sizeof(*this); }
int approximateOpCount() const override { return 0; }
SkRect cullRect() const override { return SkRect::MakeEmpty(); }
int numSlowPaths() const override { return 0; }
bool willPlayBackBitmaps() const override { return false; }
};
template <typename T>
class SkMiniPicture final : public SkPicture {
public:
SkMiniPicture(SkRect cull, T* op) : fCull(cull) {
memcpy(&fOp, op, sizeof(fOp)); // We take ownership of op's guts.
}
void playback(SkCanvas* c, AbortCallback*) const override {
SkRecords::Draw(c, nullptr, nullptr, 0, nullptr)(fOp);
}
size_t approximateBytesUsed() const override { return sizeof(*this); }
int approximateOpCount() const override { return 1; }
SkRect cullRect() const override { return fCull; }
bool willPlayBackBitmaps() const override { return SkBitmapHunter()(fOp); }
int numSlowPaths() const override {
SkPathCounter counter;
counter(fOp);
return counter.fNumSlowPathsAndDashEffects;
}
private:
SkRect fCull;
T fOp;
};
SkMiniRecorder::SkMiniRecorder() : fState(State::kEmpty) {}
SkMiniRecorder::~SkMiniRecorder() {
if (fState != State::kEmpty) {
// We have internal state pending.
// Detaching then deleting a picture is an easy way to clean up.
(void)this->detachAsPicture(SkRect::MakeEmpty());
}
SkASSERT(fState == State::kEmpty);
}
#define TRY_TO_STORE(Type, ...) \
if (fState != State::kEmpty) { return false; } \
fState = State::k##Type; \
new (fBuffer.get()) Type{__VA_ARGS__}; \
return true
bool SkMiniRecorder::drawRect(const SkRect& rect, const SkPaint& paint) {
TRY_TO_STORE(DrawRect, paint, rect);
}
bool SkMiniRecorder::drawPath(const SkPath& path, const SkPaint& paint) {
TRY_TO_STORE(DrawPath, paint, path);
}
bool SkMiniRecorder::drawTextBlob(const SkTextBlob* b, SkScalar x, SkScalar y, const SkPaint& p) {
TRY_TO_STORE(DrawTextBlob, p, sk_ref_sp(b), x, y);
}
#undef TRY_TO_STORE
sk_sp<SkPicture> SkMiniRecorder::detachAsPicture(const SkRect& cull) {
#define CASE(Type) \
case State::k##Type: \
fState = State::kEmpty; \
return sk_make_sp<SkMiniPicture<Type>>(cull, reinterpret_cast<Type*>(fBuffer.get()))
static SkOnce once;
static SkPicture* empty;
switch (fState) {
case State::kEmpty:
once([]{ empty = new SkEmptyPicture; });
return sk_ref_sp(empty);
CASE(DrawPath);
CASE(DrawRect);
CASE(DrawTextBlob);
}
SkASSERT(false);
return nullptr;
#undef CASE
}
void SkMiniRecorder::flushAndReset(SkCanvas* canvas) {
#define CASE(Type) \
case State::k##Type: { \
fState = State::kEmpty; \
Type* op = reinterpret_cast<Type*>(fBuffer.get()); \
SkRecords::Draw(canvas, nullptr, nullptr, 0, nullptr)(*op); \
op->~Type(); \
} return
switch (fState) {
case State::kEmpty: return;
CASE(DrawPath);
CASE(DrawRect);
CASE(DrawTextBlob);
}
SkASSERT(false);
#undef CASE
}
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