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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 "SkRectPriv.h"
#include "SkTextBlob.h"
#include <new>
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(); }
};
// Calculate conservative bounds for each type of draw op that can be its own mini picture.
// These are fairly easy because we know they can't be affected by any matrix or saveLayers.
static SkRect adjust_for_paint(SkRect bounds, const SkPaint& paint) {
return paint.canComputeFastBounds() ? paint.computeFastBounds(bounds, &bounds)
: SkRectPriv::MakeLargest();
}
static SkRect bounds(const DrawRect& op) {
return adjust_for_paint(op.rect, op.paint);
}
static SkRect bounds(const DrawPath& op) {
return op.path.isInverseFillType() ? SkRectPriv::MakeLargest()
: adjust_for_paint(op.path.getBounds(), op.paint);
}
static SkRect bounds(const DrawTextBlob& op) {
return adjust_for_paint(op.blob->bounds().makeOffset(op.x, op.y), op.paint);
}
template <typename T>
class SkMiniPicture final : public SkPicture {
public:
SkMiniPicture(const SkRect* cull, T* op) : fCull(cull ? *cull : bounds(*op)) {
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; }
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(nullptr);
}
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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