tests/PreFlushCallbackTest.cpp - platform/external/skia - Gitiles

 /*
  * 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 "Test.h"

 #if SK_SUPPORT_GPU

 #include "GrClip.h"
 #include "GrContextPriv.h"
 #include "GrDefaultGeoProcFactory.h"
 #include "GrPreFlushResourceProvider.h"
 #include "GrRenderTargetContextPriv.h"
 #include "GrResourceProvider.h"
 #include "GrQuad.h"
 #include "effects/GrSimpleTextureEffect.h"
 #include "ops/GrTestMeshDrawOp.h"

 // This is a simplified mesh drawing op that can be used in the atlas generation test.
 // Please see AtlasedRectOp below.
 class NonAARectOp : public GrMeshDrawOp {
 public:
     DEFINE_OP_CLASS_ID
     const char* name() const override { return "NonAARectOp"; }

     // This creates an instance of a simple non-AA solid color rect-drawing Op
     static std::unique_ptr<GrDrawOp> Make(const SkRect& r, GrColor color) {
         return std::unique_ptr<GrDrawOp>(new NonAARectOp(ClassID(), r, color));
     }

     // This creates an instance of a simple non-AA textured rect-drawing Op
     static std::unique_ptr<GrDrawOp> Make(const SkRect& r, GrColor color, const SkRect& local) {
         return std::unique_ptr<GrDrawOp>(new NonAARectOp(ClassID(), r, color, local));
     }

     GrColor color() const { return fColor; }

 protected:
     NonAARectOp(uint32_t classID, const SkRect& r, GrColor color)
         : INHERITED(classID)
         , fColor(color)
         , fHasLocalRect(false)
         , fRect(r) {
         // Choose some conservative values for aa bloat and zero area.
         this->setBounds(r, HasAABloat::kYes, IsZeroArea::kYes);
     }

     NonAARectOp(uint32_t classID, const SkRect& r, GrColor color, const SkRect& local)
         : INHERITED(classID)
         , fColor(color)
         , fHasLocalRect(true)
         , fLocalQuad(local)
         , fRect(r) {
         // Choose some conservative values for aa bloat and zero area.
         this->setBounds(r, HasAABloat::kYes, IsZeroArea::kYes);
     }

     GrColor fColor;
     bool    fHasLocalRect;
     GrQuad  fLocalQuad;
     SkRect  fRect;

 private:
     void getFragmentProcessorAnalysisInputs(FragmentProcessorAnalysisInputs* input) const override {
         input->colorInput()->setToUnknown();
         input->coverageInput()->setToUnknown();
     }

     void applyPipelineOptimizations(const GrPipelineOptimizations& optimizations) override {
         optimizations.getOverrideColorIfSet(&fColor);
     }

     bool onCombineIfPossible(GrOp*, const GrCaps&) override { return false; }

     void onPrepareDraws(Target* target) const override {
         using namespace GrDefaultGeoProcFactory;

         // The vertex attrib order is always pos, color, local coords.
         static const int kColorOffset = sizeof(SkPoint);
         static const int kLocalOffset = sizeof(SkPoint) + sizeof(GrColor);

         sk_sp<GrGeometryProcessor> gp =
                 GrDefaultGeoProcFactory::Make(Color::kPremulGrColorAttribute_Type,
                                               Coverage::kSolid_Type,
                                               fHasLocalRect ? LocalCoords::kHasExplicit_Type
                                                             : LocalCoords::kUnused_Type,
                                               SkMatrix::I());
         if (!gp) {
             SkDebugf("Couldn't create GrGeometryProcessor for GrAtlasedOp\n");
             return;
         }

         size_t vertexStride = gp->getVertexStride();

         SkASSERT(fHasLocalRect
                     ? vertexStride == sizeof(GrDefaultGeoProcFactory::PositionColorLocalCoordAttr)
                     : vertexStride == sizeof(GrDefaultGeoProcFactory::PositionColorAttr));

         const GrBuffer* indexBuffer;
         int firstIndex;
         uint16_t* indices = target->makeIndexSpace(6, &indexBuffer, &firstIndex);
         if (!indices) {
             SkDebugf("Indices could not be allocated for GrAtlasedOp.\n");
             return;
         }

         const GrBuffer* vertexBuffer;
         int firstVertex;
         void* vertices = target->makeVertexSpace(vertexStride, 4, &vertexBuffer, &firstVertex);
         if (!vertices) {
             SkDebugf("Vertices could not be allocated for GrAtlasedOp.\n");
             return;
         }

         // Setup indices
         indices[0] = 0;
         indices[1] = 1;
         indices[2] = 2;
         indices[3] = 0;
         indices[4] = 2;
         indices[5] = 3;

         // Setup positions
         SkPoint* position = (SkPoint*) vertices;
         position->setRectFan(fRect.fLeft, fRect.fTop, fRect.fRight, fRect.fBottom, vertexStride);

         // Setup vertex colors
         GrColor* color = (GrColor*)((intptr_t)vertices + kColorOffset);
         for (int i = 0; i < 4; ++i) {
             *color = fColor;
             color = (GrColor*)((intptr_t)color + vertexStride);
         }

         // Setup local coords
         if (fHasLocalRect) {
             SkPoint* coords = (SkPoint*)((intptr_t) vertices + kLocalOffset);
             for (int i = 0; i < 4; i++) {
                 *coords = fLocalQuad.point(i);
                 coords = (SkPoint*)((intptr_t) coords + vertexStride);
             }
         }

         GrMesh mesh;
         mesh.initIndexed(kTriangles_GrPrimitiveType,
                          vertexBuffer, indexBuffer,
                          firstVertex, firstIndex,
                          4, 6);

         target->draw(gp.get(), mesh);
     }

     typedef GrMeshDrawOp INHERITED;
 };

 #ifdef SK_DEBUG
 #include "SkImageEncoder.h"
 #include "sk_tool_utils.h"

 static void save_bm(const SkBitmap& bm, const char name[]) {
     bool result = sk_tool_utils::EncodeImageToFile(name, bm, SkEncodedImageFormat::kPNG, 100);
     SkASSERT(result);
 }
 #endif

 /*
  * Atlased ops just draw themselves as textured rects with the texture pixels being
  * pulled out of the atlas. Their color is based on their ID.
  */
 class AtlasedRectOp final : public NonAARectOp {
 public:
     DEFINE_OP_CLASS_ID

     ~AtlasedRectOp() override {
         fID = -1;
     }

     const char* name() const override { return "AtlasedRectOp"; }

     int id() const { return fID; }

     static std::unique_ptr<AtlasedRectOp> Make(const SkRect& r, int id) {
         return std::unique_ptr<AtlasedRectOp>(new AtlasedRectOp(r, id));
     }

     void setColor(GrColor color) { fColor = color; }
     void setLocalRect(const SkRect& localRect) {
         SkASSERT(fHasLocalRect);    // This should've been created to anticipate this
         fLocalQuad.set(localRect);
     }

     AtlasedRectOp* next() const { return fNext; }
     void setNext(AtlasedRectOp* next) {
         fNext = next;
     }

 private:
     // We set the initial color of the NonAARectOp based on the ID.
     // Note that we force creation of a NonAARectOp that has local coords in anticipation of
     // pulling from the atlas.
     AtlasedRectOp(const SkRect& r, int id)
         : INHERITED(ClassID(), r, kColors[id], SkRect::MakeEmpty())
         , fID(id)
         , fNext(nullptr) {
         SkASSERT(fID < kMaxIDs);
     }

     static const int kMaxIDs = 9;
     static const SkColor kColors[kMaxIDs];

     int            fID;
     // The Atlased ops have an internal singly-linked list of ops that land in the same opList
     AtlasedRectOp* fNext;

     typedef NonAARectOp INHERITED;
 };

 const GrColor AtlasedRectOp::kColors[kMaxIDs] = {
     GrColorPackRGBA(255, 0, 0, 255),
     GrColorPackRGBA(0, 255, 0, 255),
     GrColorPackRGBA(0, 0, 255, 255),
     GrColorPackRGBA(0, 255, 255, 255),
     GrColorPackRGBA(255, 0, 255, 255),
     GrColorPackRGBA(255, 255, 0, 255),
     GrColorPackRGBA(0, 0, 0, 255),
     GrColorPackRGBA(128, 128, 128, 255),
     GrColorPackRGBA(255, 255, 255, 255)
 };

 static const int kDrawnTileSize = 16;

 /*
  * Rather than performing any rect packing, this atlaser just lays out constant-sized
  * tiles in an Nx1 row
  */
 static const int kAtlasTileSize = 2;

 /*
  * This class aggregates the op information required for atlasing
  */
 class AtlasObject final : public GrPreFlushCallbackObject {
 public:
     AtlasObject() : fDone(false) { }

     ~AtlasObject() override {
         SkASSERT(fDone);
     }

     void markAsDone() {
         fDone = true;
     }

     // Insert the new op in an internal singly-linked list for 'opListID'
     void addOp(uint32_t opListID, AtlasedRectOp* op) {
         LinkedListHeader* header = nullptr;
         for (int i = 0; i < fOps.count(); ++i) {
             if (opListID == fOps[i].fID) {
                 header = &(fOps[i]);
             }
         }

         if (!header) {
             fOps.push({opListID, nullptr});
             header = &(fOps[fOps.count()-1]);
         }

         op->setNext(header->fHead);
         header->fHead = op;
     }

     // For the time being we need to pre-allocate the atlas.
     void setAtlasDest(sk_sp<GrTextureProxy> atlasDest) {
         fAtlasDest = atlasDest;
     }

     void saveRTC(sk_sp<GrRenderTargetContext> rtc) {
         SkASSERT(!fRTC);
         fRTC = rtc;
     }

 #ifdef SK_DEBUG
     void saveAtlasToDisk() {
         SkBitmap readBack;
         readBack.allocN32Pixels(fRTC->width(), fRTC->height());

         bool result = fRTC->readPixels(readBack.info(),
                                        readBack.getPixels(), readBack.rowBytes(), 0, 0);
         SkASSERT(result);
         save_bm(readBack, "atlas-real.png");
     }
 #endif

     /*
      * This callback back creates the atlas and updates the AtlasedRectOps to read from it
      */
     void preFlush(GrPreFlushResourceProvider* resourceProvider,
                   const uint32_t* opListIDs, int numOpListIDs,
                   SkTArray<sk_sp<GrRenderTargetContext>>* results) override {
         SkASSERT(!results->count());

         // Until MDB is landed we will most-likely only have one opList.
         SkTDArray<LinkedListHeader*> lists;
         for (int i = 0; i < numOpListIDs; ++i) {
             if (LinkedListHeader* list = this->getList(opListIDs[i])) {
                 lists.push(list);
             }
         }

         if (!lists.count()) {
             return; // nothing to atlas
         }

         // TODO: right now we have to pre-allocate the atlas bc the TextureSamplers need a
         // hard GrTexture
 #if 0
         GrSurfaceDesc desc;
         desc.fFlags = kRenderTarget_GrSurfaceFlag;
         desc.fWidth = this->numOps() * kAtlasTileSize;
         desc.fHeight = kAtlasTileSize;
         desc.fConfig = kRGBA_8888_GrPixelConfig;

         sk_sp<GrRenderTargetContext> rtc = resourceProvider->makeRenderTargetContext(desc,
                                                                                      nullptr,
                                                                                      nullptr);
 #else
         // At this point all the GrAtlasedOp's should have lined up to read from 'atlasDest' and
         // there should either be two writes to clear it or no writes.
         SkASSERT(9 == fAtlasDest->getPendingReadCnt_TestOnly());
         SkASSERT(2 == fAtlasDest->getPendingWriteCnt_TestOnly() ||
                  0 == fAtlasDest->getPendingWriteCnt_TestOnly());
         sk_sp<GrRenderTargetContext> rtc = resourceProvider->makeRenderTargetContext(
                                                                            fAtlasDest,
                                                                            nullptr, nullptr);
 #endif

         rtc->clear(nullptr, 0xFFFFFFFF, true); // clear the atlas

         int blocksInAtlas = 0;
         for (int i = 0; i < lists.count(); ++i) {
             for (AtlasedRectOp* op = lists[i]->fHead; op; op = op->next()) {
                 SkIRect r = SkIRect::MakeXYWH(blocksInAtlas*kAtlasTileSize, 0,
                                               kAtlasTileSize, kAtlasTileSize);

                 // For now, we avoid the resource buffer issues and just use clears
 #if 1
                 rtc->clear(&r, op->color(), false);
 #else
                 std::unique_ptr<GrDrawOp> drawOp(GrNonAARectOp::Make(SkRect::Make(r),
                                                  atlasedOp->color()));

                 GrPaint paint;
                 rtc->priv().testingOnly_addDrawOp(std::move(paint),
                                                   GrAAType::kNone,
                                                   std::move(drawOp));
 #endif
                 blocksInAtlas++;

                 // Set the atlased Op's color to white (so we know we're not using it for
                 // the final draw).
                 op->setColor(0xFFFFFFFF);

                 // Set the atlased Op's localRect to point to where it landed in the atlas
                 op->setLocalRect(SkRect::Make(r));

                 // TODO: we also need to set the op's GrSuperDeferredSimpleTextureEffect to point
                 // to the rtc's proxy!
             }

             // We've updated all these ops and we certainly don't want to process them again
             this->clearOpsFor(lists[i]);
         }

         // Hide a ref to the RTC in AtlasData so we can check on it later
         this->saveRTC(rtc);

         results->push_back(std::move(rtc));
     }

 private:
     typedef struct {
         uint32_t       fID;
         AtlasedRectOp* fHead;
     } LinkedListHeader;

     LinkedListHeader* getList(uint32_t opListID) {
         for (int i = 0; i < fOps.count(); ++i) {
             if (opListID == fOps[i].fID) {
                 return &(fOps[i]);
             }
         }
         return nullptr;
     }

     void clearOpsFor(LinkedListHeader* header) {
         // The AtlasedRectOps have yet to execute (and this class doesn't own them) so just
         // forget about them in the laziest way possible.
         header->fHead = nullptr;
         header->fID = 0;            // invalid opList ID
     }

     // Each opList containing AtlasedRectOps gets its own internal singly-linked list
     SkTDArray<LinkedListHeader>  fOps;

     // The RTC used to create the atlas
     sk_sp<GrRenderTargetContext> fRTC;

     // For the time being we need to pre-allocate the atlas bc the TextureSamplers require
     // a GrTexture
     sk_sp<GrTextureProxy>        fAtlasDest;

     // Set to true when the testing harness expects this object to be no longer used
     bool                         fDone;
 };

 // This creates an off-screen rendertarget whose ops which eventually pull from the atlas.
 static sk_sp<GrTextureProxy> make_upstream_image(GrContext* context, AtlasObject* object, int start,
                                                  sk_sp<GrTextureProxy> fakeAtlas) {

     sk_sp<GrRenderTargetContext> rtc(context->makeRenderTargetContext(SkBackingFit::kApprox,
                                                                       3*kDrawnTileSize,
                                                                       kDrawnTileSize,
                                                                       kRGBA_8888_GrPixelConfig,
                                                                       nullptr));

     rtc->clear(nullptr, GrColorPackRGBA(255, 0, 0, 255), true);

     for (int i = 0; i < 3; ++i) {
         SkRect r = SkRect::MakeXYWH(i*kDrawnTileSize, 0, kDrawnTileSize, kDrawnTileSize);

         std::unique_ptr<AtlasedRectOp> op(AtlasedRectOp::Make(r, start+i));

         // TODO: here is the blocker for deferring creation of the atlas. The TextureSamplers
         // created here currently require a hard GrTexture.
         sk_sp<GrFragmentProcessor> fp = GrSimpleTextureEffect::Make(context->resourceProvider(),
                                                                     fakeAtlas,
                                                                     nullptr, SkMatrix::I());

         GrPaint paint;
         paint.addColorFragmentProcessor(std::move(fp));
         paint.setPorterDuffXPFactory(SkBlendMode::kSrc);

         AtlasedRectOp* sparePtr = op.get();

         uint32_t opListID = rtc->priv().testingOnly_addMeshDrawOp(std::move(paint),
                                                                   GrAAType::kNone,
                                                                   std::move(op));

         object->addOp(opListID, sparePtr);
     }

     return rtc->asTextureProxyRef();
 }

 // Enable this if you want to debug the final draws w/o having the atlasCallback create the
 // atlas
 #if 0
 #include "SkGrPriv.h"

 sk_sp<GrTextureProxy> pre_create_atlas(GrContext* context) {
     SkBitmap bm;
     bm.allocN32Pixels(18, 2, true);
     bm.erase(SK_ColorRED,     SkIRect::MakeXYWH(0, 0, 2, 2));
     bm.erase(SK_ColorGREEN,   SkIRect::MakeXYWH(2, 0, 2, 2));
     bm.erase(SK_ColorBLUE,    SkIRect::MakeXYWH(4, 0, 2, 2));
     bm.erase(SK_ColorCYAN,    SkIRect::MakeXYWH(6, 0, 2, 2));
     bm.erase(SK_ColorMAGENTA, SkIRect::MakeXYWH(8, 0, 2, 2));
     bm.erase(SK_ColorYELLOW,  SkIRect::MakeXYWH(10, 0, 2, 2));
     bm.erase(SK_ColorBLACK,   SkIRect::MakeXYWH(12, 0, 2, 2));
     bm.erase(SK_ColorGRAY,    SkIRect::MakeXYWH(14, 0, 2, 2));
     bm.erase(SK_ColorWHITE,   SkIRect::MakeXYWH(16, 0, 2, 2));

 #if 1
     save_bm(bm, "atlas-fake.png");
 #endif

     GrSurfaceDesc desc = GrImageInfoToSurfaceDesc(bm.info(), *context->caps());
     desc.fFlags |= kRenderTarget_GrSurfaceFlag;

     sk_sp<GrSurfaceProxy> tmp = GrSurfaceProxy::MakeDeferred(*context->caps(),
                                                              context->textureProvider(),
                                                              desc, SkBudgeted::kYes,
                                                              bm.getPixels(), bm.rowBytes());

     return sk_ref_sp(tmp->asTextureProxy());
 }
 #else
 // TODO: this is unfortunate and must be removed. We want the atlas to be created later.
 sk_sp<GrTextureProxy> pre_create_atlas(GrContext* context) {
     GrSurfaceDesc desc;
     desc.fFlags = kRenderTarget_GrSurfaceFlag;
     desc.fConfig = kSkia8888_GrPixelConfig;
     desc.fOrigin = kBottomLeft_GrSurfaceOrigin;
     desc.fWidth = 32;
     desc.fHeight = 16;
     sk_sp<GrSurfaceProxy> atlasDest = GrSurfaceProxy::MakeDeferred(
                                                             context->resourceProvider(),
                                                             desc, SkBackingFit::kExact,
                                                             SkBudgeted::kYes,
                                                             GrResourceProvider::kNoPendingIO_Flag);
     return sk_ref_sp(atlasDest->asTextureProxy());
 }
 #endif

 static void test_color(skiatest::Reporter* reporter, const SkBitmap& bm, int x, SkColor expected) {
     SkColor readback = bm.getColor(x, kDrawnTileSize/2);
     REPORTER_ASSERT(reporter, expected == readback);
     if (expected != readback) {
         SkDebugf("Color mismatch: %x %x\n", expected, readback);
     }
 }

 /*
  * For the atlasing test we make a DAG that looks like:
  *
  *    RT1 with ops: 0,1,2       RT2 with ops: 3,4,5       RT3 with ops: 6,7,8
  *                     \         /
  *                      \       /
  *                         RT4
  * We then flush RT4 and expect only ops 0-5 to be atlased together.
  * Each op is just a solid colored rect so both the atlas and the final image should appear as:
  *           R G B C M Y
  * with the atlas having width = 6*kAtlasTileSize and height = kAtlasTileSize.
  *
  * Note: until MDB lands, the atlas will actually have width= 9*kAtlasTileSize and look like:
  *           R G B C M Y K Grey White
  */
 DEF_GPUTEST_FOR_GL_RENDERING_CONTEXTS(PreFlushCallbackTest, reporter, ctxInfo) {
     static const int kNumProxies = 3;

     GrContext* context = ctxInfo.grContext();

     if (context->caps()->useDrawInsteadOfClear()) {
         // TODO: fix the buffer issues so this can run on all devices
         return;
     }

     sk_sp<AtlasObject> object = sk_make_sp<AtlasObject>();

     // For now (until we add a GrSuperDeferredSimpleTextureEffect), we create the final atlas
     // proxy ahead of time.
     sk_sp<GrTextureProxy> atlasDest = pre_create_atlas(context);

     object->setAtlasDest(atlasDest);

     context->contextPriv().addPreFlushCallbackObject(object);

     sk_sp<GrTextureProxy> proxies[kNumProxies];
     for (int i = 0; i < kNumProxies; ++i) {
         proxies[i] = make_upstream_image(context, object.get(), i*3, atlasDest);
     }

     static const int kFinalWidth = 6*kDrawnTileSize;
     static const int kFinalHeight = kDrawnTileSize;

     sk_sp<GrRenderTargetContext> rtc(context->makeRenderTargetContext(SkBackingFit::kApprox,
                                                                       kFinalWidth,
                                                                       kFinalHeight,
                                                                       kRGBA_8888_GrPixelConfig,
                                                                       nullptr));

     rtc->clear(nullptr, 0xFFFFFFFF, true);

     // Note that this doesn't include the third texture proxy
     for (int i = 0; i < kNumProxies-1; ++i) {
         SkRect r = SkRect::MakeXYWH(i*3*kDrawnTileSize, 0, 3*kDrawnTileSize, kDrawnTileSize);

         SkMatrix t = SkMatrix::MakeTrans(-i*3*kDrawnTileSize, 0);

         GrPaint paint;
         sk_sp<GrFragmentProcessor> fp(GrSimpleTextureEffect::Make(context->resourceProvider(),
                                                                   std::move(proxies[i]),
                                                                   nullptr, t));
         paint.setPorterDuffXPFactory(SkBlendMode::kSrc);
         paint.addColorFragmentProcessor(std::move(fp));

         rtc->drawRect(GrNoClip(), std::move(paint), GrAA::kNo, SkMatrix::I(), r);
     }

     rtc->prepareForExternalIO();

     SkBitmap readBack;
     readBack.allocN32Pixels(kFinalWidth, kFinalHeight);

     SkDEBUGCODE(bool result =) rtc->readPixels(readBack.info(), readBack.getPixels(),
                                                readBack.rowBytes(), 0, 0);
     SkASSERT(result);

     object->markAsDone();

 #if 0
     save_bm(readBack, "atlas-final-image.png");
     data.saveAtlasToDisk();
 #endif

     int x = kDrawnTileSize/2;
     test_color(reporter, readBack, x, SK_ColorRED);
     x += kDrawnTileSize;
     test_color(reporter, readBack, x, SK_ColorGREEN);
     x += kDrawnTileSize;
     test_color(reporter, readBack, x, SK_ColorBLUE);
     x += kDrawnTileSize;
     test_color(reporter, readBack, x, SK_ColorCYAN);
     x += kDrawnTileSize;
     test_color(reporter, readBack, x, SK_ColorMAGENTA);
     x += kDrawnTileSize;
     test_color(reporter, readBack, x, SK_ColorYELLOW);
 }

 #endif
	/*
	* 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 "Test.h"

	#if SK_SUPPORT_GPU

	#include "GrClip.h"
	#include "GrContextPriv.h"
	#include "GrDefaultGeoProcFactory.h"
	#include "GrPreFlushResourceProvider.h"
	#include "GrRenderTargetContextPriv.h"
	#include "GrResourceProvider.h"
	#include "GrQuad.h"
	#include "effects/GrSimpleTextureEffect.h"
	#include "ops/GrTestMeshDrawOp.h"

	// This is a simplified mesh drawing op that can be used in the atlas generation test.
	// Please see AtlasedRectOp below.
	class NonAARectOp : public GrMeshDrawOp {
	public:
	DEFINE_OP_CLASS_ID
	const char* name() const override { return "NonAARectOp"; }

	// This creates an instance of a simple non-AA solid color rect-drawing Op
	static std::unique_ptr<GrDrawOp> Make(const SkRect& r, GrColor color) {
	return std::unique_ptr<GrDrawOp>(new NonAARectOp(ClassID(), r, color));
	}

	// This creates an instance of a simple non-AA textured rect-drawing Op
	static std::unique_ptr<GrDrawOp> Make(const SkRect& r, GrColor color, const SkRect& local) {
	return std::unique_ptr<GrDrawOp>(new NonAARectOp(ClassID(), r, color, local));
	}

	GrColor color() const { return fColor; }

	protected:
	NonAARectOp(uint32_t classID, const SkRect& r, GrColor color)
	: INHERITED(classID)
	, fColor(color)
	, fHasLocalRect(false)
	, fRect(r) {
	// Choose some conservative values for aa bloat and zero area.
	this->setBounds(r, HasAABloat::kYes, IsZeroArea::kYes);
	}

	NonAARectOp(uint32_t classID, const SkRect& r, GrColor color, const SkRect& local)
	: INHERITED(classID)
	, fColor(color)
	, fHasLocalRect(true)
	, fLocalQuad(local)
	, fRect(r) {
	// Choose some conservative values for aa bloat and zero area.
	this->setBounds(r, HasAABloat::kYes, IsZeroArea::kYes);
	}

	GrColor fColor;
	bool fHasLocalRect;
	GrQuad fLocalQuad;
	SkRect fRect;

	private:
	void getFragmentProcessorAnalysisInputs(FragmentProcessorAnalysisInputs* input) const override {
	input->colorInput()->setToUnknown();
	input->coverageInput()->setToUnknown();
	}

	void applyPipelineOptimizations(const GrPipelineOptimizations& optimizations) override {
	optimizations.getOverrideColorIfSet(&fColor);
	}

	bool onCombineIfPossible(GrOp*, const GrCaps&) override { return false; }

	void onPrepareDraws(Target* target) const override {
	using namespace GrDefaultGeoProcFactory;

	// The vertex attrib order is always pos, color, local coords.
	static const int kColorOffset = sizeof(SkPoint);
	static const int kLocalOffset = sizeof(SkPoint) + sizeof(GrColor);

	sk_sp<GrGeometryProcessor> gp =
	GrDefaultGeoProcFactory::Make(Color::kPremulGrColorAttribute_Type,
	Coverage::kSolid_Type,
	fHasLocalRect ? LocalCoords::kHasExplicit_Type
	: LocalCoords::kUnused_Type,
	SkMatrix::I());
	if (!gp) {
	SkDebugf("Couldn't create GrGeometryProcessor for GrAtlasedOp\n");
	return;
	}

	size_t vertexStride = gp->getVertexStride();

	SkASSERT(fHasLocalRect
	? vertexStride == sizeof(GrDefaultGeoProcFactory::PositionColorLocalCoordAttr)
	: vertexStride == sizeof(GrDefaultGeoProcFactory::PositionColorAttr));

	const GrBuffer* indexBuffer;
	int firstIndex;
	uint16_t* indices = target->makeIndexSpace(6, &indexBuffer, &firstIndex);
	if (!indices) {
	SkDebugf("Indices could not be allocated for GrAtlasedOp.\n");
	return;
	}

	const GrBuffer* vertexBuffer;
	int firstVertex;
	void* vertices = target->makeVertexSpace(vertexStride, 4, &vertexBuffer, &firstVertex);
	if (!vertices) {
	SkDebugf("Vertices could not be allocated for GrAtlasedOp.\n");
	return;
	}

	// Setup indices
	indices[0] = 0;
	indices[1] = 1;
	indices[2] = 2;
	indices[3] = 0;
	indices[4] = 2;
	indices[5] = 3;

	// Setup positions
	SkPoint* position = (SkPoint*) vertices;
	position->setRectFan(fRect.fLeft, fRect.fTop, fRect.fRight, fRect.fBottom, vertexStride);

	// Setup vertex colors
	GrColor* color = (GrColor*)((intptr_t)vertices + kColorOffset);
	for (int i = 0; i < 4; ++i) {
	*color = fColor;
	color = (GrColor*)((intptr_t)color + vertexStride);
	}

	// Setup local coords
	if (fHasLocalRect) {
	SkPoint* coords = (SkPoint*)((intptr_t) vertices + kLocalOffset);
	for (int i = 0; i < 4; i++) {
	*coords = fLocalQuad.point(i);
	coords = (SkPoint*)((intptr_t) coords + vertexStride);
	}
	}

	GrMesh mesh;
	mesh.initIndexed(kTriangles_GrPrimitiveType,
	vertexBuffer, indexBuffer,
	firstVertex, firstIndex,
	4, 6);

	target->draw(gp.get(), mesh);
	}

	typedef GrMeshDrawOp INHERITED;
	};

	#ifdef SK_DEBUG
	#include "SkImageEncoder.h"
	#include "sk_tool_utils.h"

	static void save_bm(const SkBitmap& bm, const char name[]) {
	bool result = sk_tool_utils::EncodeImageToFile(name, bm, SkEncodedImageFormat::kPNG, 100);
	SkASSERT(result);
	}
	#endif

	/*
	* Atlased ops just draw themselves as textured rects with the texture pixels being
	* pulled out of the atlas. Their color is based on their ID.
	*/
	class AtlasedRectOp final : public NonAARectOp {
	public:
	DEFINE_OP_CLASS_ID

	~AtlasedRectOp() override {
	fID = -1;
	}

	const char* name() const override { return "AtlasedRectOp"; }

	int id() const { return fID; }

	static std::unique_ptr<AtlasedRectOp> Make(const SkRect& r, int id) {
	return std::unique_ptr<AtlasedRectOp>(new AtlasedRectOp(r, id));
	}

	void setColor(GrColor color) { fColor = color; }
	void setLocalRect(const SkRect& localRect) {
	SkASSERT(fHasLocalRect); // This should've been created to anticipate this
	fLocalQuad.set(localRect);
	}

	AtlasedRectOp* next() const { return fNext; }
	void setNext(AtlasedRectOp* next) {
	fNext = next;
	}

	private:
	// We set the initial color of the NonAARectOp based on the ID.
	// Note that we force creation of a NonAARectOp that has local coords in anticipation of
	// pulling from the atlas.
	AtlasedRectOp(const SkRect& r, int id)
	: INHERITED(ClassID(), r, kColors[id], SkRect::MakeEmpty())
	, fID(id)
	, fNext(nullptr) {
	SkASSERT(fID < kMaxIDs);
	}

	static const int kMaxIDs = 9;
	static const SkColor kColors[kMaxIDs];

	int fID;
	// The Atlased ops have an internal singly-linked list of ops that land in the same opList
	AtlasedRectOp* fNext;

	typedef NonAARectOp INHERITED;
	};

	const GrColor AtlasedRectOp::kColors[kMaxIDs] = {
	GrColorPackRGBA(255, 0, 0, 255),
	GrColorPackRGBA(0, 255, 0, 255),
	GrColorPackRGBA(0, 0, 255, 255),
	GrColorPackRGBA(0, 255, 255, 255),
	GrColorPackRGBA(255, 0, 255, 255),
	GrColorPackRGBA(255, 255, 0, 255),
	GrColorPackRGBA(0, 0, 0, 255),
	GrColorPackRGBA(128, 128, 128, 255),
	GrColorPackRGBA(255, 255, 255, 255)
	};

	static const int kDrawnTileSize = 16;

	/*
	* Rather than performing any rect packing, this atlaser just lays out constant-sized
	* tiles in an Nx1 row
	*/
	static const int kAtlasTileSize = 2;

	/*
	* This class aggregates the op information required for atlasing
	*/
	class AtlasObject final : public GrPreFlushCallbackObject {
	public:
	AtlasObject() : fDone(false) { }

	~AtlasObject() override {
	SkASSERT(fDone);
	}

	void markAsDone() {
	fDone = true;
	}

	// Insert the new op in an internal singly-linked list for 'opListID'
	void addOp(uint32_t opListID, AtlasedRectOp* op) {
	LinkedListHeader* header = nullptr;
	for (int i = 0; i < fOps.count(); ++i) {
	if (opListID == fOps[i].fID) {
	header = &(fOps[i]);
	}
	}

	if (!header) {
	fOps.push({opListID, nullptr});
	header = &(fOps[fOps.count()-1]);
	}

	op->setNext(header->fHead);
	header->fHead = op;
	}

	// For the time being we need to pre-allocate the atlas.
	void setAtlasDest(sk_sp<GrTextureProxy> atlasDest) {
	fAtlasDest = atlasDest;
	}

	void saveRTC(sk_sp<GrRenderTargetContext> rtc) {
	SkASSERT(!fRTC);
	fRTC = rtc;
	}

	#ifdef SK_DEBUG
	void saveAtlasToDisk() {
	SkBitmap readBack;
	readBack.allocN32Pixels(fRTC->width(), fRTC->height());

	bool result = fRTC->readPixels(readBack.info(),
	readBack.getPixels(), readBack.rowBytes(), 0, 0);
	SkASSERT(result);
	save_bm(readBack, "atlas-real.png");
	}
	#endif

	/*
	* This callback back creates the atlas and updates the AtlasedRectOps to read from it
	*/
	void preFlush(GrPreFlushResourceProvider* resourceProvider,
	const uint32_t* opListIDs, int numOpListIDs,
	SkTArray<sk_sp<GrRenderTargetContext>>* results) override {
	SkASSERT(!results->count());

	// Until MDB is landed we will most-likely only have one opList.
	SkTDArray<LinkedListHeader*> lists;
	for (int i = 0; i < numOpListIDs; ++i) {
	if (LinkedListHeader* list = this->getList(opListIDs[i])) {
	lists.push(list);
	}
	}

	if (!lists.count()) {
	return; // nothing to atlas
	}

	// TODO: right now we have to pre-allocate the atlas bc the TextureSamplers need a
	// hard GrTexture
	#if 0
	GrSurfaceDesc desc;
	desc.fFlags = kRenderTarget_GrSurfaceFlag;
	desc.fWidth = this->numOps() * kAtlasTileSize;
	desc.fHeight = kAtlasTileSize;
	desc.fConfig = kRGBA_8888_GrPixelConfig;

	sk_sp<GrRenderTargetContext> rtc = resourceProvider->makeRenderTargetContext(desc,
	nullptr,
	nullptr);
	#else
	// At this point all the GrAtlasedOp's should have lined up to read from 'atlasDest' and
	// there should either be two writes to clear it or no writes.
	SkASSERT(9 == fAtlasDest->getPendingReadCnt_TestOnly());
	SkASSERT(2 == fAtlasDest->getPendingWriteCnt_TestOnly() \|\|
	0 == fAtlasDest->getPendingWriteCnt_TestOnly());
	sk_sp<GrRenderTargetContext> rtc = resourceProvider->makeRenderTargetContext(
	fAtlasDest,
	nullptr, nullptr);
	#endif

	rtc->clear(nullptr, 0xFFFFFFFF, true); // clear the atlas

	int blocksInAtlas = 0;
	for (int i = 0; i < lists.count(); ++i) {
	for (AtlasedRectOp* op = lists[i]->fHead; op; op = op->next()) {
	SkIRect r = SkIRect::MakeXYWH(blocksInAtlas*kAtlasTileSize, 0,
	kAtlasTileSize, kAtlasTileSize);

	// For now, we avoid the resource buffer issues and just use clears
	#if 1
	rtc->clear(&r, op->color(), false);
	#else
	std::unique_ptr<GrDrawOp> drawOp(GrNonAARectOp::Make(SkRect::Make(r),
	atlasedOp->color()));

	GrPaint paint;
	rtc->priv().testingOnly_addDrawOp(std::move(paint),
	GrAAType::kNone,
	std::move(drawOp));
	#endif
	blocksInAtlas++;

	// Set the atlased Op's color to white (so we know we're not using it for
	// the final draw).
	op->setColor(0xFFFFFFFF);

	// Set the atlased Op's localRect to point to where it landed in the atlas
	op->setLocalRect(SkRect::Make(r));

	// TODO: we also need to set the op's GrSuperDeferredSimpleTextureEffect to point
	// to the rtc's proxy!
	}

	// We've updated all these ops and we certainly don't want to process them again
	this->clearOpsFor(lists[i]);
	}

	// Hide a ref to the RTC in AtlasData so we can check on it later
	this->saveRTC(rtc);

	results->push_back(std::move(rtc));
	}

	private:
	typedef struct {
	uint32_t fID;
	AtlasedRectOp* fHead;
	} LinkedListHeader;

	LinkedListHeader* getList(uint32_t opListID) {
	for (int i = 0; i < fOps.count(); ++i) {
	if (opListID == fOps[i].fID) {
	return &(fOps[i]);
	}
	}
	return nullptr;
	}

	void clearOpsFor(LinkedListHeader* header) {
	// The AtlasedRectOps have yet to execute (and this class doesn't own them) so just
	// forget about them in the laziest way possible.
	header->fHead = nullptr;
	header->fID = 0; // invalid opList ID
	}

	// Each opList containing AtlasedRectOps gets its own internal singly-linked list
	SkTDArray<LinkedListHeader> fOps;

	// The RTC used to create the atlas
	sk_sp<GrRenderTargetContext> fRTC;

	// For the time being we need to pre-allocate the atlas bc the TextureSamplers require
	// a GrTexture
	sk_sp<GrTextureProxy> fAtlasDest;

	// Set to true when the testing harness expects this object to be no longer used
	bool fDone;
	};

	// This creates an off-screen rendertarget whose ops which eventually pull from the atlas.
	static sk_sp<GrTextureProxy> make_upstream_image(GrContext* context, AtlasObject* object, int start,
	sk_sp<GrTextureProxy> fakeAtlas) {

	sk_sp<GrRenderTargetContext> rtc(context->makeRenderTargetContext(SkBackingFit::kApprox,
	3*kDrawnTileSize,
	kDrawnTileSize,
	kRGBA_8888_GrPixelConfig,
	nullptr));

	rtc->clear(nullptr, GrColorPackRGBA(255, 0, 0, 255), true);

	for (int i = 0; i < 3; ++i) {
	SkRect r = SkRect::MakeXYWH(i*kDrawnTileSize, 0, kDrawnTileSize, kDrawnTileSize);

	std::unique_ptr<AtlasedRectOp> op(AtlasedRectOp::Make(r, start+i));

	// TODO: here is the blocker for deferring creation of the atlas. The TextureSamplers
	// created here currently require a hard GrTexture.
	sk_sp<GrFragmentProcessor> fp = GrSimpleTextureEffect::Make(context->resourceProvider(),
	fakeAtlas,
	nullptr, SkMatrix::I());

	GrPaint paint;
	paint.addColorFragmentProcessor(std::move(fp));
	paint.setPorterDuffXPFactory(SkBlendMode::kSrc);

	AtlasedRectOp* sparePtr = op.get();

	uint32_t opListID = rtc->priv().testingOnly_addMeshDrawOp(std::move(paint),
	GrAAType::kNone,
	std::move(op));

	object->addOp(opListID, sparePtr);
	}

	return rtc->asTextureProxyRef();
	}

	// Enable this if you want to debug the final draws w/o having the atlasCallback create the
	// atlas
	#if 0
	#include "SkGrPriv.h"

	sk_sp<GrTextureProxy> pre_create_atlas(GrContext* context) {
	SkBitmap bm;
	bm.allocN32Pixels(18, 2, true);
	bm.erase(SK_ColorRED, SkIRect::MakeXYWH(0, 0, 2, 2));
	bm.erase(SK_ColorGREEN, SkIRect::MakeXYWH(2, 0, 2, 2));
	bm.erase(SK_ColorBLUE, SkIRect::MakeXYWH(4, 0, 2, 2));
	bm.erase(SK_ColorCYAN, SkIRect::MakeXYWH(6, 0, 2, 2));
	bm.erase(SK_ColorMAGENTA, SkIRect::MakeXYWH(8, 0, 2, 2));
	bm.erase(SK_ColorYELLOW, SkIRect::MakeXYWH(10, 0, 2, 2));
	bm.erase(SK_ColorBLACK, SkIRect::MakeXYWH(12, 0, 2, 2));
	bm.erase(SK_ColorGRAY, SkIRect::MakeXYWH(14, 0, 2, 2));
	bm.erase(SK_ColorWHITE, SkIRect::MakeXYWH(16, 0, 2, 2));

	#if 1
	save_bm(bm, "atlas-fake.png");
	#endif

	GrSurfaceDesc desc = GrImageInfoToSurfaceDesc(bm.info(), *context->caps());
	desc.fFlags \|= kRenderTarget_GrSurfaceFlag;

	sk_sp<GrSurfaceProxy> tmp = GrSurfaceProxy::MakeDeferred(*context->caps(),
	context->textureProvider(),
	desc, SkBudgeted::kYes,
	bm.getPixels(), bm.rowBytes());

	return sk_ref_sp(tmp->asTextureProxy());
	}
	#else
	// TODO: this is unfortunate and must be removed. We want the atlas to be created later.
	sk_sp<GrTextureProxy> pre_create_atlas(GrContext* context) {
	GrSurfaceDesc desc;
	desc.fFlags = kRenderTarget_GrSurfaceFlag;
	desc.fConfig = kSkia8888_GrPixelConfig;
	desc.fOrigin = kBottomLeft_GrSurfaceOrigin;
	desc.fWidth = 32;
	desc.fHeight = 16;
	sk_sp<GrSurfaceProxy> atlasDest = GrSurfaceProxy::MakeDeferred(
	context->resourceProvider(),
	desc, SkBackingFit::kExact,
	SkBudgeted::kYes,
	GrResourceProvider::kNoPendingIO_Flag);
	return sk_ref_sp(atlasDest->asTextureProxy());
	}
	#endif

	static void test_color(skiatest::Reporter* reporter, const SkBitmap& bm, int x, SkColor expected) {
	SkColor readback = bm.getColor(x, kDrawnTileSize/2);
	REPORTER_ASSERT(reporter, expected == readback);
	if (expected != readback) {
	SkDebugf("Color mismatch: %x %x\n", expected, readback);
	}
	}

	/*
	* For the atlasing test we make a DAG that looks like:
	*
	* RT1 with ops: 0,1,2 RT2 with ops: 3,4,5 RT3 with ops: 6,7,8
	* \ /
	* \ /
	* RT4
	* We then flush RT4 and expect only ops 0-5 to be atlased together.
	* Each op is just a solid colored rect so both the atlas and the final image should appear as:
	* R G B C M Y
	* with the atlas having width = 6*kAtlasTileSize and height = kAtlasTileSize.
	*
	* Note: until MDB lands, the atlas will actually have width= 9*kAtlasTileSize and look like:
	* R G B C M Y K Grey White
	*/
	DEF_GPUTEST_FOR_GL_RENDERING_CONTEXTS(PreFlushCallbackTest, reporter, ctxInfo) {
	static const int kNumProxies = 3;

	GrContext* context = ctxInfo.grContext();

	if (context->caps()->useDrawInsteadOfClear()) {
	// TODO: fix the buffer issues so this can run on all devices
	return;
	}

	sk_sp<AtlasObject> object = sk_make_sp<AtlasObject>();

	// For now (until we add a GrSuperDeferredSimpleTextureEffect), we create the final atlas
	// proxy ahead of time.
	sk_sp<GrTextureProxy> atlasDest = pre_create_atlas(context);

	object->setAtlasDest(atlasDest);

	context->contextPriv().addPreFlushCallbackObject(object);

	sk_sp<GrTextureProxy> proxies[kNumProxies];
	for (int i = 0; i < kNumProxies; ++i) {
	proxies[i] = make_upstream_image(context, object.get(), i*3, atlasDest);
	}

	static const int kFinalWidth = 6*kDrawnTileSize;
	static const int kFinalHeight = kDrawnTileSize;

	sk_sp<GrRenderTargetContext> rtc(context->makeRenderTargetContext(SkBackingFit::kApprox,
	kFinalWidth,
	kFinalHeight,
	kRGBA_8888_GrPixelConfig,
	nullptr));

	rtc->clear(nullptr, 0xFFFFFFFF, true);

	// Note that this doesn't include the third texture proxy
	for (int i = 0; i < kNumProxies-1; ++i) {
	SkRect r = SkRect::MakeXYWH(i3kDrawnTileSize, 0, 3*kDrawnTileSize, kDrawnTileSize);

	SkMatrix t = SkMatrix::MakeTrans(-i3kDrawnTileSize, 0);

	GrPaint paint;
	sk_sp<GrFragmentProcessor> fp(GrSimpleTextureEffect::Make(context->resourceProvider(),
	std::move(proxies[i]),
	nullptr, t));
	paint.setPorterDuffXPFactory(SkBlendMode::kSrc);
	paint.addColorFragmentProcessor(std::move(fp));

	rtc->drawRect(GrNoClip(), std::move(paint), GrAA::kNo, SkMatrix::I(), r);
	}

	rtc->prepareForExternalIO();

	SkBitmap readBack;
	readBack.allocN32Pixels(kFinalWidth, kFinalHeight);

	SkDEBUGCODE(bool result =) rtc->readPixels(readBack.info(), readBack.getPixels(),
	readBack.rowBytes(), 0, 0);
	SkASSERT(result);

	object->markAsDone();

	#if 0
	save_bm(readBack, "atlas-final-image.png");
	data.saveAtlasToDisk();
	#endif

	int x = kDrawnTileSize/2;
	test_color(reporter, readBack, x, SK_ColorRED);
	x += kDrawnTileSize;
	test_color(reporter, readBack, x, SK_ColorGREEN);
	x += kDrawnTileSize;
	test_color(reporter, readBack, x, SK_ColorBLUE);
	x += kDrawnTileSize;
	test_color(reporter, readBack, x, SK_ColorCYAN);
	x += kDrawnTileSize;
	test_color(reporter, readBack, x, SK_ColorMAGENTA);
	x += kDrawnTileSize;
	test_color(reporter, readBack, x, SK_ColorYELLOW);
	}

	#endif