| /* |
| * Copyright 2022 Google LLC |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "src/gpu/graphite/DrawAtlas.h" |
| |
| #include <memory> |
| |
| #include "include/core/SkColorSpace.h" |
| #include "include/core/SkStream.h" |
| #include "include/gpu/graphite/Recorder.h" |
| #include "include/private/SkColorData.h" |
| #include "include/private/base/SkTPin.h" |
| |
| #include "src/base/SkMathPriv.h" |
| #include "src/core/SkTraceEvent.h" |
| #include "src/gpu/AtlasTypes.h" |
| #include "src/gpu/graphite/Caps.h" |
| #include "src/gpu/graphite/CommandTypes.h" |
| #include "src/gpu/graphite/ContextPriv.h" |
| #include "src/gpu/graphite/DrawContext.h" |
| #include "src/gpu/graphite/RecorderPriv.h" |
| #include "src/gpu/graphite/TextureProxy.h" |
| |
| using namespace skia_private; |
| |
| namespace skgpu::graphite { |
| |
| #if defined(DUMP_ATLAS_DATA) |
| static const constexpr bool kDumpAtlasData = true; |
| #else |
| static const constexpr bool kDumpAtlasData = false; |
| #endif |
| |
| #ifdef SK_DEBUG |
| void DrawAtlas::validate(const AtlasLocator& atlasLocator) const { |
| // Verify that the plotIndex stored in the PlotLocator is consistent with the glyph rectangle |
| int numPlotsX = fTextureWidth / fPlotWidth; |
| int numPlotsY = fTextureHeight / fPlotHeight; |
| |
| int plotIndex = atlasLocator.plotIndex(); |
| auto topLeft = atlasLocator.topLeft(); |
| int plotX = topLeft.x() / fPlotWidth; |
| int plotY = topLeft.y() / fPlotHeight; |
| SkASSERT(plotIndex == (numPlotsY - plotY - 1) * numPlotsX + (numPlotsX - plotX - 1)); |
| } |
| #endif |
| |
| std::unique_ptr<DrawAtlas> DrawAtlas::Make(SkColorType colorType, size_t bpp, int width, |
| int height, int plotWidth, int plotHeight, |
| AtlasGenerationCounter* generationCounter, |
| AllowMultitexturing allowMultitexturing, |
| UseStorageTextures useStorageTextures, |
| PlotEvictionCallback* evictor, |
| std::string_view label) { |
| std::unique_ptr<DrawAtlas> atlas(new DrawAtlas(colorType, bpp, width, height, |
| plotWidth, plotHeight, generationCounter, |
| allowMultitexturing, useStorageTextures, label)); |
| |
| if (evictor != nullptr) { |
| atlas->fEvictionCallbacks.emplace_back(evictor); |
| } |
| return atlas; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| static uint32_t next_id() { |
| static std::atomic<uint32_t> nextID{1}; |
| uint32_t id; |
| do { |
| id = nextID.fetch_add(1, std::memory_order_relaxed); |
| } while (id == SK_InvalidGenID); |
| return id; |
| } |
| DrawAtlas::DrawAtlas(SkColorType colorType, size_t bpp, int width, int height, |
| int plotWidth, int plotHeight, AtlasGenerationCounter* generationCounter, |
| AllowMultitexturing allowMultitexturing, |
| UseStorageTextures useStorageTextures, |
| std::string_view label) |
| : fColorType(colorType) |
| , fBytesPerPixel(bpp) |
| , fTextureWidth(width) |
| , fTextureHeight(height) |
| , fPlotWidth(plotWidth) |
| , fPlotHeight(plotHeight) |
| , fUseStorageTextures(useStorageTextures) |
| , fLabel(label) |
| , fAtlasID(next_id()) |
| , fGenerationCounter(generationCounter) |
| , fAtlasGeneration(fGenerationCounter->next()) |
| , fPrevFlushToken(AtlasToken::InvalidToken()) |
| , fFlushesSinceLastUse(0) |
| , fMaxPages(allowMultitexturing == AllowMultitexturing::kYes ? |
| PlotLocator::kMaxMultitexturePages : 1) |
| , fNumActivePages(0) { |
| int numPlotsX = width/plotWidth; |
| int numPlotsY = height/plotHeight; |
| SkASSERT(numPlotsX * numPlotsY <= PlotLocator::kMaxPlots); |
| SkASSERTF(fPlotWidth * numPlotsX == fTextureWidth, |
| "Invalid DrawAtlas. Plot width: %d, texture width %d", fPlotWidth, fTextureWidth); |
| SkASSERTF(fPlotHeight * numPlotsY == fTextureHeight, |
| "Invalid DrawAtlas. Plot height: %d, texture height %d", fPlotHeight, fTextureHeight); |
| |
| fNumPlots = numPlotsX * numPlotsY; |
| |
| this->createPages(generationCounter); |
| } |
| |
| inline void DrawAtlas::processEviction(PlotLocator plotLocator) { |
| for (PlotEvictionCallback* evictor : fEvictionCallbacks) { |
| evictor->evict(plotLocator); |
| } |
| |
| fAtlasGeneration = fGenerationCounter->next(); |
| } |
| |
| inline void DrawAtlas::updatePlot(Plot* plot, AtlasLocator* atlasLocator) { |
| int pageIdx = plot->pageIndex(); |
| this->makeMRU(plot, pageIdx); |
| |
| // The actual upload will be created in recordUploads(). |
| |
| atlasLocator->updatePlotLocator(plot->plotLocator()); |
| SkDEBUGCODE(this->validate(*atlasLocator);) |
| } |
| |
| bool DrawAtlas::addRectToPage(unsigned int pageIdx, int width, int height, |
| AtlasLocator* atlasLocator) { |
| SkASSERT(fProxies[pageIdx]); |
| |
| // look through all allocated plots for one we can share, in Most Recently Refed order |
| PlotList::Iter plotIter; |
| plotIter.init(fPages[pageIdx].fPlotList, PlotList::Iter::kHead_IterStart); |
| |
| for (Plot* plot = plotIter.get(); plot; plot = plotIter.next()) { |
| if (plot->addRect(width, height, atlasLocator)) { |
| this->updatePlot(plot, atlasLocator); |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| bool DrawAtlas::recordUploads(DrawContext* dc, Recorder* recorder) { |
| TRACE_EVENT0("skia.gpu", TRACE_FUNC); |
| for (uint32_t pageIdx = 0; pageIdx < fNumActivePages; ++pageIdx) { |
| PlotList::Iter plotIter; |
| plotIter.init(fPages[pageIdx].fPlotList, PlotList::Iter::kHead_IterStart); |
| for (Plot* plot = plotIter.get(); plot; plot = plotIter.next()) { |
| if (plot->needsUpload()) { |
| TextureProxy* proxy = fProxies[pageIdx].get(); |
| SkASSERT(proxy); |
| |
| const void* dataPtr; |
| SkIRect dstRect; |
| std::tie(dataPtr, dstRect) = plot->prepareForUpload(); |
| if (dstRect.isEmpty()) { |
| continue; |
| } |
| |
| std::vector<MipLevel> levels; |
| levels.push_back({dataPtr, fBytesPerPixel*fPlotWidth}); |
| |
| // Src and dst colorInfo are the same |
| SkColorInfo colorInfo(fColorType, kUnknown_SkAlphaType, nullptr); |
| if (!dc->recordUpload(recorder, sk_ref_sp(proxy), colorInfo, colorInfo, levels, |
| dstRect, /*ConditionalUploadContext=*/nullptr)) { |
| return false; |
| } |
| } |
| } |
| } |
| return true; |
| } |
| |
| // Number of atlas-related flushes beyond which we consider a plot to no longer be in use. |
| // |
| // This value is somewhat arbitrary -- the idea is to keep it low enough that |
| // a page with unused plots will get removed reasonably quickly, but allow it |
| // to hang around for a bit in case it's needed. The assumption is that flushes |
| // are rare; i.e., we are not continually refreshing the frame. |
| static constexpr auto kPlotRecentlyUsedCount = 32; |
| static constexpr auto kAtlasRecentlyUsedCount = 128; |
| |
| DrawAtlas::ErrorCode DrawAtlas::addRect(Recorder* recorder, |
| int width, int height, |
| AtlasLocator* atlasLocator) { |
| if (width > fPlotWidth || height > fPlotHeight || width < 0 || height < 0) { |
| return ErrorCode::kError; |
| } |
| |
| // We permit zero-sized rects to allow inverse fills in the PathAtlases to work, |
| // but we don't want to enter them in the Rectanizer. So we handle this special case here. |
| // For text this should be caught at a higher level, but if not the only end result |
| // will be rendering a degenerate quad. |
| if (width == 0 || height == 0) { |
| if (fNumActivePages == 0) { |
| // Make sure we have a Page for the AtlasLocator to refer to |
| this->activateNewPage(recorder); |
| } |
| atlasLocator->updateRect(skgpu::IRect16::MakeXYWH(0, 0, 0, 0)); |
| // Use the MRU Plot from the first Page |
| atlasLocator->updatePlotLocator(fPages[0].fPlotList.head()->plotLocator()); |
| return ErrorCode::kSucceeded; |
| } |
| |
| // Look through each page to see if we can upload without having to flush |
| // We prioritize this upload to the first pages, not the most recently used, to make it easier |
| // to remove unused pages in reverse page order. |
| for (unsigned int pageIdx = 0; pageIdx < fNumActivePages; ++pageIdx) { |
| if (this->addRectToPage(pageIdx, width, height, atlasLocator)) { |
| return ErrorCode::kSucceeded; |
| } |
| } |
| |
| // If the above fails, then see if the least recently used plot per page has already been |
| // queued for upload if we're at max page allocation, or if the plot has aged out otherwise. |
| // We wait until we've grown to the full number of pages to begin evicting already queued |
| // plots so that we can maximize the opportunity for reuse. |
| // As before we prioritize this upload to the first pages, not the most recently used. |
| if (fNumActivePages == this->maxPages()) { |
| for (unsigned int pageIdx = 0; pageIdx < fNumActivePages; ++pageIdx) { |
| Plot* plot = fPages[pageIdx].fPlotList.tail(); |
| SkASSERT(plot); |
| if (plot->lastUseToken() < recorder->priv().tokenTracker()->nextFlushToken()) { |
| this->processEvictionAndResetRects(plot); |
| SkDEBUGCODE(bool verify = )plot->addRect(width, height, atlasLocator); |
| SkASSERT(verify); |
| this->updatePlot(plot, atlasLocator); |
| return ErrorCode::kSucceeded; |
| } |
| } |
| } else { |
| // If we haven't activated all the available pages, try to create a new one and add to it |
| if (!this->activateNewPage(recorder)) { |
| return ErrorCode::kError; |
| } |
| |
| if (this->addRectToPage(fNumActivePages-1, width, height, atlasLocator)) { |
| return ErrorCode::kSucceeded; |
| } else { |
| // If we fail to upload to a newly activated page then something has gone terribly |
| // wrong - return an error |
| return ErrorCode::kError; |
| } |
| } |
| |
| if (!fNumActivePages) { |
| return ErrorCode::kError; |
| } |
| |
| // All plots are currently in use by the current set of draws, so we need to fail. This |
| // gives the Device a chance to snap the current set of uploads and draws, advance the draw |
| // token, and call back into this function. The subsequent call will have plots available |
| // for fresh uploads. |
| return ErrorCode::kTryAgain; |
| } |
| |
| DrawAtlas::ErrorCode DrawAtlas::addToAtlas(Recorder* recorder, |
| int width, int height, const void* image, |
| AtlasLocator* atlasLocator) { |
| ErrorCode ec = this->addRect(recorder, width, height, atlasLocator); |
| if (ec == ErrorCode::kSucceeded) { |
| Plot* plot = this->findPlot(*atlasLocator); |
| plot->copySubImage(*atlasLocator, image); |
| } |
| |
| return ec; |
| } |
| |
| SkIPoint DrawAtlas::prepForRender(const AtlasLocator& locator, SkAutoPixmapStorage* pixmap) { |
| Plot* plot = this->findPlot(locator); |
| return plot->prepForRender(locator, pixmap); |
| } |
| |
| void DrawAtlas::compact(AtlasToken startTokenForNextFlush) { |
| if (fNumActivePages < 1) { |
| fPrevFlushToken = startTokenForNextFlush; |
| return; |
| } |
| |
| // For all plots, reset number of flushes since used if used this frame. |
| PlotList::Iter plotIter; |
| bool atlasUsedThisFlush = false; |
| for (uint32_t pageIndex = 0; pageIndex < fNumActivePages; ++pageIndex) { |
| plotIter.init(fPages[pageIndex].fPlotList, PlotList::Iter::kHead_IterStart); |
| while (Plot* plot = plotIter.get()) { |
| // Reset number of flushes since used |
| if (plot->lastUseToken().inInterval(fPrevFlushToken, startTokenForNextFlush)) { |
| plot->resetFlushesSinceLastUsed(); |
| atlasUsedThisFlush = true; |
| } |
| |
| plotIter.next(); |
| } |
| } |
| |
| if (atlasUsedThisFlush) { |
| fFlushesSinceLastUse = 0; |
| } else { |
| ++fFlushesSinceLastUse; |
| } |
| |
| // We only try to compact if the atlas was used in the recently completed flush or |
| // hasn't been used in a long time. |
| // This is to handle the case where a lot of text or path rendering has occurred but then just |
| // a blinking cursor is drawn. |
| if (atlasUsedThisFlush || fFlushesSinceLastUse > kAtlasRecentlyUsedCount) { |
| TArray<Plot*> availablePlots; |
| uint32_t lastPageIndex = fNumActivePages - 1; |
| |
| // For all plots but the last one, update number of flushes since used, and check to see |
| // if there are any in the first pages that the last page can safely upload to. |
| for (uint32_t pageIndex = 0; pageIndex < lastPageIndex; ++pageIndex) { |
| if constexpr (kDumpAtlasData) { |
| SkDebugf("page %u: ", pageIndex); |
| } |
| |
| plotIter.init(fPages[pageIndex].fPlotList, PlotList::Iter::kHead_IterStart); |
| while (Plot* plot = plotIter.get()) { |
| // Update number of flushes since plot was last used |
| // We only increment the 'sinceLastUsed' count for flushes where the atlas was used |
| // to avoid deleting everything when we return to text drawing in the blinking |
| // cursor case |
| if (!plot->lastUseToken().inInterval(fPrevFlushToken, startTokenForNextFlush)) { |
| plot->incFlushesSinceLastUsed(); |
| } |
| |
| if constexpr (kDumpAtlasData) { |
| SkDebugf("%d ", plot->flushesSinceLastUsed()); |
| } |
| |
| // Count plots we can potentially upload to in all pages except the last one |
| // (the potential compactee). |
| if (plot->flushesSinceLastUsed() > kPlotRecentlyUsedCount) { |
| availablePlots.push_back() = plot; |
| } |
| |
| plotIter.next(); |
| } |
| |
| if constexpr (kDumpAtlasData) { |
| SkDebugf("\n"); |
| } |
| } |
| |
| // Count recently used plots in the last page and evict any that are no longer in use. |
| // Since we prioritize uploading to the first pages, this will eventually |
| // clear out usage of this page unless we have a large need. |
| plotIter.init(fPages[lastPageIndex].fPlotList, PlotList::Iter::kHead_IterStart); |
| unsigned int usedPlots = 0; |
| if constexpr (kDumpAtlasData) { |
| SkDebugf("page %u: ", lastPageIndex); |
| } |
| while (Plot* plot = plotIter.get()) { |
| // Update number of flushes since plot was last used |
| if (!plot->lastUseToken().inInterval(fPrevFlushToken, startTokenForNextFlush)) { |
| plot->incFlushesSinceLastUsed(); |
| } |
| |
| if constexpr (kDumpAtlasData) { |
| SkDebugf("%d ", plot->flushesSinceLastUsed()); |
| } |
| |
| // If this plot was used recently |
| if (plot->flushesSinceLastUsed() <= kPlotRecentlyUsedCount) { |
| usedPlots++; |
| } else if (plot->lastUseToken() != AtlasToken::InvalidToken()) { |
| // otherwise if aged out just evict it. |
| this->processEvictionAndResetRects(plot); |
| } |
| plotIter.next(); |
| } |
| |
| if constexpr (kDumpAtlasData) { |
| SkDebugf("\n"); |
| } |
| |
| // If recently used plots in the last page are using less than a quarter of the page, try |
| // to evict them if there's available space in lower index pages. Since we prioritize |
| // uploading to the first pages, this will eventually clear out usage of this page unless |
| // we have a large need. |
| if (availablePlots.size() && usedPlots && usedPlots <= fNumPlots / 4) { |
| plotIter.init(fPages[lastPageIndex].fPlotList, PlotList::Iter::kHead_IterStart); |
| while (Plot* plot = plotIter.get()) { |
| // If this plot was used recently |
| if (plot->flushesSinceLastUsed() <= kPlotRecentlyUsedCount) { |
| // See if there's room in an lower index page and if so evict. |
| // We need to be somewhat harsh here so that a handful of plots that are |
| // consistently in use don't end up locking the page in memory. |
| if (availablePlots.size() > 0) { |
| this->processEvictionAndResetRects(plot); |
| this->processEvictionAndResetRects(availablePlots.back()); |
| availablePlots.pop_back(); |
| --usedPlots; |
| } |
| if (!usedPlots || !availablePlots.size()) { |
| break; |
| } |
| } |
| plotIter.next(); |
| } |
| } |
| |
| // If none of the plots in the last page have been used recently, delete it. |
| if (!usedPlots) { |
| if constexpr (kDumpAtlasData) { |
| SkDebugf("delete %u\n", fNumActivePages-1); |
| } |
| |
| this->deactivateLastPage(); |
| fFlushesSinceLastUse = 0; |
| } |
| } |
| |
| fPrevFlushToken = startTokenForNextFlush; |
| } |
| |
| bool DrawAtlas::createPages(AtlasGenerationCounter* generationCounter) { |
| SkASSERT(SkIsPow2(fTextureWidth) && SkIsPow2(fTextureHeight)); |
| |
| int numPlotsX = fTextureWidth/fPlotWidth; |
| int numPlotsY = fTextureHeight/fPlotHeight; |
| |
| for (uint32_t i = 0; i < this->maxPages(); ++i) { |
| // Proxies are uncreated at first |
| fProxies[i] = nullptr; |
| |
| // set up allocated plots |
| fPages[i].fPlotArray = std::make_unique<sk_sp<Plot>[]>(numPlotsX * numPlotsY); |
| |
| sk_sp<Plot>* currPlot = fPages[i].fPlotArray.get(); |
| for (int y = numPlotsY - 1, r = 0; y >= 0; --y, ++r) { |
| for (int x = numPlotsX - 1, c = 0; x >= 0; --x, ++c) { |
| uint32_t plotIndex = r * numPlotsX + c; |
| currPlot->reset(new Plot( |
| i, plotIndex, generationCounter, x, y, fPlotWidth, fPlotHeight, fColorType, |
| fBytesPerPixel)); |
| |
| // build LRU list |
| fPages[i].fPlotList.addToHead(currPlot->get()); |
| ++currPlot; |
| } |
| } |
| } |
| |
| return true; |
| } |
| |
| bool DrawAtlas::activateNewPage(Recorder* recorder) { |
| SkASSERT(fNumActivePages < this->maxPages()); |
| SkASSERT(!fProxies[fNumActivePages]); |
| |
| const Caps* caps = recorder->priv().caps(); |
| auto textureInfo = fUseStorageTextures == UseStorageTextures::kYes |
| ? caps->getDefaultStorageTextureInfo(fColorType) |
| : caps->getDefaultSampledTextureInfo(fColorType, |
| Mipmapped::kNo, |
| recorder->priv().isProtected(), |
| Renderable::kNo); |
| fProxies[fNumActivePages] = TextureProxy::Make(caps, |
| recorder->priv().resourceProvider(), |
| {fTextureWidth, fTextureHeight}, |
| textureInfo, |
| fLabel, |
| skgpu::Budgeted::kYes); |
| if (!fProxies[fNumActivePages]) { |
| return false; |
| } |
| |
| if constexpr (kDumpAtlasData) { |
| SkDebugf("activated page#: %u\n", fNumActivePages); |
| } |
| |
| ++fNumActivePages; |
| return true; |
| } |
| |
| inline void DrawAtlas::deactivateLastPage() { |
| SkASSERT(fNumActivePages); |
| |
| uint32_t lastPageIndex = fNumActivePages - 1; |
| |
| int numPlotsX = fTextureWidth/fPlotWidth; |
| int numPlotsY = fTextureHeight/fPlotHeight; |
| |
| fPages[lastPageIndex].fPlotList.reset(); |
| for (int r = 0; r < numPlotsY; ++r) { |
| for (int c = 0; c < numPlotsX; ++c) { |
| uint32_t plotIndex = r * numPlotsX + c; |
| |
| Plot* currPlot = fPages[lastPageIndex].fPlotArray[plotIndex].get(); |
| currPlot->resetRects(); |
| currPlot->resetFlushesSinceLastUsed(); |
| |
| // rebuild the LRU list |
| SkDEBUGCODE(currPlot->resetListPtrs()); |
| fPages[lastPageIndex].fPlotList.addToHead(currPlot); |
| } |
| } |
| |
| // remove ref to the texture proxy |
| fProxies[lastPageIndex].reset(); |
| --fNumActivePages; |
| } |
| |
| void DrawAtlas::markUsedPlotsAsFull() { |
| PlotList::Iter plotIter; |
| for (uint32_t pageIndex = 0; pageIndex < fNumActivePages; ++pageIndex) { |
| plotIter.init(fPages[pageIndex].fPlotList, PlotList::Iter::kHead_IterStart); |
| while (Plot* plot = plotIter.get()) { |
| plot->markFullIfUsed(); |
| plotIter.next(); |
| } |
| } |
| } |
| |
| void DrawAtlas::evictAllPlots() { |
| PlotList::Iter plotIter; |
| for (uint32_t pageIndex = 0; pageIndex < fNumActivePages; ++pageIndex) { |
| plotIter.init(fPages[pageIndex].fPlotList, PlotList::Iter::kHead_IterStart); |
| while (Plot* plot = plotIter.get()) { |
| this->processEvictionAndResetRects(plot); |
| plotIter.next(); |
| } |
| } |
| } |
| |
| DrawAtlasConfig::DrawAtlasConfig(int maxTextureSize, size_t maxBytes) { |
| static const SkISize kARGBDimensions[] = { |
| {256, 256}, // maxBytes < 2^19 |
| {512, 256}, // 2^19 <= maxBytes < 2^20 |
| {512, 512}, // 2^20 <= maxBytes < 2^21 |
| {1024, 512}, // 2^21 <= maxBytes < 2^22 |
| {1024, 1024}, // 2^22 <= maxBytes < 2^23 |
| {2048, 1024}, // 2^23 <= maxBytes |
| }; |
| |
| // Index 0 corresponds to maxBytes of 2^18, so start by dividing it by that |
| maxBytes >>= 18; |
| // Take the floor of the log to get the index |
| int index = maxBytes > 0 |
| ? SkTPin<int>(SkPrevLog2(maxBytes), 0, std::size(kARGBDimensions) - 1) |
| : 0; |
| |
| SkASSERT(kARGBDimensions[index].width() <= kMaxAtlasDim); |
| SkASSERT(kARGBDimensions[index].height() <= kMaxAtlasDim); |
| fARGBDimensions.set(std::min<int>(kARGBDimensions[index].width(), maxTextureSize), |
| std::min<int>(kARGBDimensions[index].height(), maxTextureSize)); |
| fMaxTextureSize = std::min<int>(maxTextureSize, kMaxAtlasDim); |
| } |
| |
| SkISize DrawAtlasConfig::atlasDimensions(MaskFormat type) const { |
| if (MaskFormat::kA8 == type) { |
| // A8 is always 2x the ARGB dimensions, clamped to the max allowed texture size |
| return { std::min<int>(2 * fARGBDimensions.width(), fMaxTextureSize), |
| std::min<int>(2 * fARGBDimensions.height(), fMaxTextureSize) }; |
| } else { |
| return fARGBDimensions; |
| } |
| } |
| |
| SkISize DrawAtlasConfig::plotDimensions(MaskFormat type) const { |
| if (MaskFormat::kA8 == type) { |
| SkISize atlasDimensions = this->atlasDimensions(type); |
| // For A8 we want to grow the plots at larger texture sizes to accept more of the |
| // larger SDF glyphs. Since the largest SDF glyph can be 170x170 with padding, this |
| // allows us to pack 3 in a 512x256 plot, or 9 in a 512x512 plot. |
| |
| // This will give us 512x256 plots for 2048x1024, 512x512 plots for 2048x2048, |
| // and 256x256 plots otherwise. |
| int plotWidth = atlasDimensions.width() >= 2048 ? 512 : 256; |
| int plotHeight = atlasDimensions.height() >= 2048 ? 512 : 256; |
| |
| return { plotWidth, plotHeight }; |
| } else { |
| // ARGB and LCD always use 256x256 plots -- this has been shown to be faster |
| return { 256, 256 }; |
| } |
| } |
| |
| } // namespace skgpu::graphite |