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/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrCCAtlas.h"
#include "GrClip.h"
#include "GrOnFlushResourceProvider.h"
#include "GrRectanizer_skyline.h"
#include "GrRenderTargetContext.h"
#include "GrTextureProxy.h"
#include "SkMakeUnique.h"
#include "SkMathPriv.h"
#include "ccpr/GrCCCoverageProcessor.h"
#include "ccpr/GrCCPathParser.h"
#include "ops/GrDrawOp.h"
static constexpr int kAtlasMinSize = 1024;
static constexpr int kPadding = 1;
class GrCCAtlas::Node {
public:
Node(std::unique_ptr<Node> previous, int l, int t, int r, int b)
: fPrevious(std::move(previous)), fX(l), fY(t), fRectanizer(r - l, b - t) {}
Node* previous() const { return fPrevious.get(); }
bool addRect(int w, int h, SkIPoint16* loc, int maxAtlasSize) {
// Pad all paths except those that are expected to take up an entire physical texture.
if (w < maxAtlasSize) {
w = SkTMin(w + kPadding, maxAtlasSize);
}
if (h < maxAtlasSize) {
h = SkTMin(h + kPadding, maxAtlasSize);
}
if (!fRectanizer.addRect(w, h, loc)) {
return false;
}
loc->fX += fX;
loc->fY += fY;
return true;
}
private:
const std::unique_ptr<Node> fPrevious;
const int fX, fY;
GrRectanizerSkyline fRectanizer;
};
class GrCCAtlas::DrawCoverageCountOp : public GrDrawOp {
public:
DEFINE_OP_CLASS_ID
DrawCoverageCountOp(sk_sp<const GrCCPathParser> parser, CoverageCountBatchID batchID,
const SkISize& drawBounds)
: INHERITED(ClassID())
, fParser(std::move(parser))
, fBatchID(batchID)
, fDrawBounds(drawBounds) {
this->setBounds(SkRect::MakeIWH(fDrawBounds.width(), fDrawBounds.height()),
GrOp::HasAABloat::kNo, GrOp::IsZeroArea::kNo);
}
// GrDrawOp interface.
const char* name() const override { return "GrCCAtlas::DrawCoverageCountOp"; }
FixedFunctionFlags fixedFunctionFlags() const override { return FixedFunctionFlags::kNone; }
RequiresDstTexture finalize(const GrCaps&, const GrAppliedClip*,
GrPixelConfigIsClamped) override { return RequiresDstTexture::kNo; }
bool onCombineIfPossible(GrOp* other, const GrCaps& caps) override { return false; }
void onPrepare(GrOpFlushState*) override {}
void onExecute(GrOpFlushState* flushState) override {
fParser->drawCoverageCount(flushState, fBatchID,
SkIRect::MakeWH(fDrawBounds.width(), fDrawBounds.height()));
}
private:
const sk_sp<const GrCCPathParser> fParser;
const CoverageCountBatchID fBatchID;
const SkISize fDrawBounds;
typedef GrDrawOp INHERITED;
};
GrCCAtlas::GrCCAtlas(const GrCaps& caps, int minSize)
: fMaxAtlasSize(SkTMax(minSize, caps.maxPreferredRenderTargetSize())) {
// Caller should have cropped any paths to the destination render target instead of asking for
// an atlas larger than maxRenderTargetSize.
SkASSERT(fMaxAtlasSize <= caps.maxRenderTargetSize());
int initialSize = GrNextPow2(minSize + kPadding);
initialSize = SkTMax(kAtlasMinSize, initialSize);
initialSize = SkTMin(initialSize, fMaxAtlasSize);
fHeight = fWidth = initialSize;
fTopNode = skstd::make_unique<Node>(nullptr, 0, 0, fWidth, fHeight);
}
GrCCAtlas::~GrCCAtlas() {
}
bool GrCCAtlas::addRect(int w, int h, SkIPoint16* loc) {
// This can't be called anymore once setCoverageCountBatchID() has been called.
SkASSERT(!fCoverageCountBatchID);
SkASSERT(!fTextureProxy);
if (!this->internalPlaceRect(w, h, loc)) {
return false;
}
fDrawBounds.fWidth = SkTMax(fDrawBounds.width(), loc->x() + w);
fDrawBounds.fHeight = SkTMax(fDrawBounds.height(), loc->y() + h);
return true;
}
bool GrCCAtlas::internalPlaceRect(int w, int h, SkIPoint16* loc) {
for (Node* node = fTopNode.get(); node; node = node->previous()) {
if (node->addRect(w, h, loc, fMaxAtlasSize)) {
return true;
}
}
// The rect didn't fit. Grow the atlas and try again.
do {
if (fWidth == fMaxAtlasSize && fHeight == fMaxAtlasSize) {
return false;
}
if (fHeight <= fWidth) {
int top = fHeight;
fHeight = SkTMin(fHeight * 2, fMaxAtlasSize);
fTopNode = skstd::make_unique<Node>(std::move(fTopNode), 0, top, fWidth, fHeight);
} else {
int left = fWidth;
fWidth = SkTMin(fWidth * 2, fMaxAtlasSize);
fTopNode = skstd::make_unique<Node>(std::move(fTopNode), left, 0, fWidth, fHeight);
}
} while (!fTopNode->addRect(w, h, loc, fMaxAtlasSize));
return true;
}
sk_sp<GrRenderTargetContext> GrCCAtlas::finalize(GrOnFlushResourceProvider* onFlushRP,
sk_sp<const GrCCPathParser> parser) {
SkASSERT(fCoverageCountBatchID);
SkASSERT(!fTextureProxy);
GrSurfaceDesc desc;
desc.fFlags = kRenderTarget_GrSurfaceFlag;
desc.fWidth = fWidth;
desc.fHeight = fHeight;
desc.fConfig = kAlpha_half_GrPixelConfig;
sk_sp<GrRenderTargetContext> rtc =
onFlushRP->makeRenderTargetContext(desc, kTopLeft_GrSurfaceOrigin, nullptr, nullptr);
if (!rtc) {
SkDebugf("WARNING: failed to allocate a %ix%i atlas. Some paths will not be drawn.\n",
fWidth, fHeight);
return nullptr;
}
SkIRect clearRect = SkIRect::MakeSize(fDrawBounds);
rtc->clear(&clearRect, 0, GrRenderTargetContext::CanClearFullscreen::kYes);
auto op = skstd::make_unique<DrawCoverageCountOp>(std::move(parser), fCoverageCountBatchID,
fDrawBounds);
rtc->addDrawOp(GrNoClip(), std::move(op));
fTextureProxy = sk_ref_sp(rtc->asTextureProxy());
return rtc;
}
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