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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 "GrCaps.h"
#include "GrOnFlushResourceProvider.h"
#include "GrRectanizer_skyline.h"
#include "GrRenderTargetContext.h"
#include "GrTextureProxy.h"
#include "SkMakeUnique.h"
#include "SkMathPriv.h"
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;
};
GrCCAtlas::GrCCAtlas(const Specs& specs)
: fMaxTextureSize(SkTMax(SkTMax(specs.fMinHeight, specs.fMinWidth),
specs.fMaxPreferredTextureSize)) {
SkASSERT(specs.fMaxPreferredTextureSize > 0);
// Begin with the first pow2 dimensions whose area is theoretically large enough to contain the
// pending paths, favoring height over width if necessary.
int log2area = SkNextLog2(SkTMax(specs.fApproxNumPixels, 1));
fHeight = 1 << ((log2area + 1) / 2);
fWidth = 1 << (log2area / 2);
fWidth = SkTClamp(fWidth, specs.fMinTextureSize, specs.fMaxPreferredTextureSize);
fHeight = SkTClamp(fHeight, specs.fMinTextureSize, specs.fMaxPreferredTextureSize);
if (fWidth < specs.fMinWidth || fHeight < specs.fMinHeight) {
// They want to stuff a particularly large path into the atlas. Just punt and go with their
// min width and height. The atlas will grow as needed.
fWidth = SkTMin(specs.fMinWidth + kPadding, fMaxTextureSize);
fHeight = SkTMin(specs.fMinHeight + kPadding, fMaxTextureSize);
}
fTopNode = skstd::make_unique<Node>(nullptr, 0, 0, fWidth, fHeight);
}
GrCCAtlas::~GrCCAtlas() {
}
bool GrCCAtlas::addRect(const SkIRect& devIBounds, SkIVector* offset) {
// This can't be called anymore once makeClearedTextureProxy() has been called.
SkASSERT(!fTextureProxy);
SkIPoint16 location;
if (!this->internalPlaceRect(devIBounds.width(), devIBounds.height(), &location)) {
return false;
}
offset->set(location.x() - devIBounds.left(), location.y() - devIBounds.top());
fDrawBounds.fWidth = SkTMax(fDrawBounds.width(), location.x() + devIBounds.width());
fDrawBounds.fHeight = SkTMax(fDrawBounds.height(), location.y() + devIBounds.height());
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, fMaxTextureSize)) {
return true;
}
}
// The rect didn't fit. Grow the atlas and try again.
do {
if (fWidth == fMaxTextureSize && fHeight == fMaxTextureSize) {
return false;
}
if (fHeight <= fWidth) {
int top = fHeight;
fHeight = SkTMin(fHeight * 2, fMaxTextureSize);
fTopNode = skstd::make_unique<Node>(std::move(fTopNode), 0, top, fWidth, fHeight);
} else {
int left = fWidth;
fWidth = SkTMin(fWidth * 2, fMaxTextureSize);
fTopNode = skstd::make_unique<Node>(std::move(fTopNode), left, 0, fWidth, fHeight);
}
} while (!fTopNode->addRect(w, h, loc, fMaxTextureSize));
return true;
}
sk_sp<GrRenderTargetContext> GrCCAtlas::initInternalTextureProxy(
GrOnFlushResourceProvider* onFlushRP, GrPixelConfig config) {
SkASSERT(!fTextureProxy);
// Caller should have cropped any paths to the destination render target instead of asking for
// an atlas larger than maxRenderTargetSize.
SkASSERT(SkTMax(fHeight, fWidth) <= fMaxTextureSize);
SkASSERT(fMaxTextureSize <= onFlushRP->caps()->maxRenderTargetSize());
GrSurfaceDesc desc;
desc.fFlags = kRenderTarget_GrSurfaceFlag;
desc.fWidth = fWidth;
desc.fHeight = fHeight;
desc.fConfig = config;
sk_sp<GrRenderTargetContext> rtc =
onFlushRP->makeRenderTargetContext(desc, kTextureOrigin, 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);
fTextureProxy = sk_ref_sp(rtc->asTextureProxy());
return rtc;
}
GrCCAtlas* GrCCAtlasStack::addRect(const SkIRect& devIBounds, SkIVector* offset) {
GrCCAtlas* retiredAtlas = nullptr;
if (fAtlases.empty() || !fAtlases.back().addRect(devIBounds, offset)) {
// The retired atlas is out of room and can't grow any bigger.
retiredAtlas = !fAtlases.empty() ? &fAtlases.back() : nullptr;
fAtlases.emplace_back(fSpecs);
SkASSERT(devIBounds.width() <= fSpecs.fMinWidth);
SkASSERT(devIBounds.height() <= fSpecs.fMinHeight);
SkAssertResult(fAtlases.back().addRect(devIBounds, offset));
}
return retiredAtlas;
}
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