src/gpu/GrBatchAtlas.cpp - skia - Git at Google

 /*
  * 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 "GrBatchAtlas.h"
 #include "GrBatchFlushState.h"
 #include "GrRectanizer.h"
 #include "GrTracing.h"

 ////////////////////////////////////////////////////////////////////////////////

 GrBatchAtlas::BatchPlot::BatchPlot(int index, uint64_t genID, int offX, int offY, int width,
                                    int height, GrPixelConfig config)
     : fLastUpload(GrBatchDrawToken::AlreadyFlushedToken())
     , fLastUse(GrBatchDrawToken::AlreadyFlushedToken())
     , fIndex(index)
     , fGenID(genID)
     , fID(CreateId(fIndex, fGenID))
     , fData(nullptr)
     , fWidth(width)
     , fHeight(height)
     , fX(offX)
     , fY(offY)
     , fRects(nullptr)
     , fOffset(SkIPoint16::Make(fX * fWidth, fY * fHeight))
     , fConfig(config)
     , fBytesPerPixel(GrBytesPerPixel(config))
 #ifdef SK_DEBUG
     , fDirty(false)
 #endif
 {
     fDirtyRect.setEmpty();
 }

 GrBatchAtlas::BatchPlot::~BatchPlot() {
     sk_free(fData);
     delete fRects;
 }

 bool GrBatchAtlas::BatchPlot::addSubImage(int width, int height, const void* image,
                                           SkIPoint16* loc) {
     SkASSERT(width <= fWidth && height <= fHeight);

     if (!fRects) {
         fRects = GrRectanizer::Factory(fWidth, fHeight);
     }

     if (!fRects->addRect(width, height, loc)) {
         return false;
     }

     if (!fData) {
         fData = reinterpret_cast<unsigned char*>(sk_calloc_throw(fBytesPerPixel * fWidth *
                                                                  fHeight));
     }
     size_t rowBytes = width * fBytesPerPixel;
     const unsigned char* imagePtr = (const unsigned char*)image;
     // point ourselves at the right starting spot
     unsigned char* dataPtr = fData;
     dataPtr += fBytesPerPixel * fWidth * loc->fY;
     dataPtr += fBytesPerPixel * loc->fX;
     // copy into the data buffer, swizzling as we go if this is ARGB data
     if (4 == fBytesPerPixel && kSkia8888_GrPixelConfig == kBGRA_8888_GrPixelConfig) {
         for (int i = 0; i < height; ++i) {
             SkOpts::RGBA_to_BGRA(reinterpret_cast<uint32_t*>(dataPtr), imagePtr, width);
             dataPtr += fBytesPerPixel * fWidth;
             imagePtr += rowBytes;
         }
     } else {
         for (int i = 0; i < height; ++i) {
             memcpy(dataPtr, imagePtr, rowBytes);
             dataPtr += fBytesPerPixel * fWidth;
             imagePtr += rowBytes;
         }
     }

     fDirtyRect.join(loc->fX, loc->fY, loc->fX + width, loc->fY + height);

     loc->fX += fOffset.fX;
     loc->fY += fOffset.fY;
     SkDEBUGCODE(fDirty = true;)

     return true;
 }

 void GrBatchAtlas::BatchPlot::uploadToTexture(GrDrawBatch::WritePixelsFn& writePixels,
                                               GrTexture* texture) {
     // We should only be issuing uploads if we are in fact dirty
     SkASSERT(fDirty && fData && texture);
     TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("skia.gpu"), "GrBatchPlot::uploadToTexture");
     size_t rowBytes = fBytesPerPixel * fWidth;
     const unsigned char* dataPtr = fData;
     dataPtr += rowBytes * fDirtyRect.fTop;
     dataPtr += fBytesPerPixel * fDirtyRect.fLeft;
     writePixels(texture, fOffset.fX + fDirtyRect.fLeft, fOffset.fY + fDirtyRect.fTop,
                 fDirtyRect.width(), fDirtyRect.height(), fConfig, dataPtr, rowBytes);
     fDirtyRect.setEmpty();
     SkDEBUGCODE(fDirty = false;)
 }

 void GrBatchAtlas::BatchPlot::resetRects() {
     if (fRects) {
         fRects->reset();
     }

     fGenID++;
     fID = CreateId(fIndex, fGenID);

     // zero out the plot
     if (fData) {
         sk_bzero(fData, fBytesPerPixel * fWidth * fHeight);
     }

     fDirtyRect.setEmpty();
     SkDEBUGCODE(fDirty = false;)
 }

 ///////////////////////////////////////////////////////////////////////////////

 GrBatchAtlas::GrBatchAtlas(GrTexture* texture, int numPlotsX, int numPlotsY)
     : fTexture(texture)
     , fAtlasGeneration(kInvalidAtlasGeneration + 1) {

     fPlotWidth = texture->width() / numPlotsX;
     fPlotHeight = texture->height() / numPlotsY;
     SkASSERT(numPlotsX * numPlotsY <= BulkUseTokenUpdater::kMaxPlots);
     SkASSERT(fPlotWidth * numPlotsX == texture->width());
     SkASSERT(fPlotHeight * numPlotsY == texture->height());

     SkDEBUGCODE(fNumPlots = numPlotsX * numPlotsY;)

     // We currently do not support compressed atlases...
     SkASSERT(!GrPixelConfigIsCompressed(texture->desc().fConfig));

     // set up allocated plots
     fPlotArray = new SkAutoTUnref<BatchPlot>[numPlotsX * numPlotsY];

     SkAutoTUnref<BatchPlot>* currPlot = fPlotArray;
     for (int y = numPlotsY - 1, r = 0; y >= 0; --y, ++r) {
         for (int x = numPlotsX - 1, c = 0; x >= 0; --x, ++c) {
             uint32_t index = r * numPlotsX + c;
             currPlot->reset(new BatchPlot(index, 1, x, y, fPlotWidth, fPlotHeight,
                                           texture->desc().fConfig));

             // build LRU list
             fPlotList.addToHead(currPlot->get());
             ++currPlot;
         }
     }
 }

 GrBatchAtlas::~GrBatchAtlas() {
     SkSafeUnref(fTexture);
     delete[] fPlotArray;
 }

 void GrBatchAtlas::processEviction(AtlasID id) {
     for (int i = 0; i < fEvictionCallbacks.count(); i++) {
         (*fEvictionCallbacks[i].fFunc)(id, fEvictionCallbacks[i].fData);
     }
 }

 inline void GrBatchAtlas::updatePlot(GrDrawBatch::Target* target, AtlasID* id, BatchPlot* plot) {
     this->makeMRU(plot);

     // If our most recent upload has already occurred then we have to insert a new
     // upload. Otherwise, we already have a scheduled upload that hasn't yet ocurred.
     // This new update will piggy back on that previously scheduled update.
     if (target->hasDrawBeenFlushed(plot->lastUploadToken())) {
         // With c+14 we could move sk_sp into lamba to only ref once.
         sk_sp<BatchPlot> plotsp(SkRef(plot));
         GrTexture* texture = fTexture;
         GrBatchDrawToken lastUploadToken = target->addAsapUpload(
             [plotsp, texture] (GrDrawBatch::WritePixelsFn& writePixels) {
                plotsp->uploadToTexture(writePixels, texture);
             }
         );
         plot->setLastUploadToken(lastUploadToken);
     }
     *id = plot->id();
 }

 bool GrBatchAtlas::addToAtlas(AtlasID* id, GrDrawBatch::Target* target,
                               int width, int height, const void* image, SkIPoint16* loc) {
     // We should already have a texture, TODO clean this up
     SkASSERT(fTexture);
     if (width > fPlotWidth || height > fPlotHeight) {
         return false;
     }

     // now look through all allocated plots for one we can share, in Most Recently Refed order
     GrBatchPlotList::Iter plotIter;
     plotIter.init(fPlotList, GrBatchPlotList::Iter::kHead_IterStart);
     BatchPlot* plot;
     while ((plot = plotIter.get())) {
         SkASSERT(GrBytesPerPixel(fTexture->desc().fConfig) == plot->bpp());
         if (plot->addSubImage(width, height, image, loc)) {
             this->updatePlot(target, id, plot);
             return true;
         }
         plotIter.next();
     }

     // If the above fails, then see if the least recently refed plot has already been flushed to the
     // gpu
     plot = fPlotList.tail();
     SkASSERT(plot);
     if (target->hasDrawBeenFlushed(plot->lastUseToken())) {
         this->processEviction(plot->id());
         plot->resetRects();
         SkASSERT(GrBytesPerPixel(fTexture->desc().fConfig) == plot->bpp());
         SkDEBUGCODE(bool verify = )plot->addSubImage(width, height, image, loc);
         SkASSERT(verify);
         this->updatePlot(target, id, plot);
         fAtlasGeneration++;
         return true;
     }

     // If this plot has been used in a draw that is currently being prepared by a batch, then we
     // have to fail. This gives the batch a chance to enqueue the draw, and call back into this
     // function. When that draw is enqueued, the draw token advances, and the subsequent call will
     // continue past this branch and prepare an inline upload that will occur after the enqueued
     // draw which references the plot's pre-upload content.
     if (plot->lastUseToken() == target->nextDrawToken()) {
         return false;
     }

     this->processEviction(plot->id());
     fPlotList.remove(plot);
     SkAutoTUnref<BatchPlot>& newPlot = fPlotArray[plot->index()];
     newPlot.reset(plot->clone());

     fPlotList.addToHead(newPlot.get());
     SkASSERT(GrBytesPerPixel(fTexture->desc().fConfig) == newPlot->bpp());
     SkDEBUGCODE(bool verify = )newPlot->addSubImage(width, height, image, loc);
     SkASSERT(verify);

     // Note that this plot will be uploaded inline with the draws whereas the
     // one it displaced most likely was uploaded asap.
     // With c+14 we could move sk_sp into lamba to only ref once.
     sk_sp<BatchPlot> plotsp(SkRef(newPlot.get()));
     GrTexture* texture = fTexture;
     GrBatchDrawToken lastUploadToken = target->addInlineUpload(
         [plotsp, texture] (GrDrawBatch::WritePixelsFn& writePixels) {
             plotsp->uploadToTexture(writePixels, texture);
         }
     );
     newPlot->setLastUploadToken(lastUploadToken);

     *id = newPlot->id();

     fAtlasGeneration++;
     return true;
 }
	/*
	* 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 "GrBatchAtlas.h"
	#include "GrBatchFlushState.h"
	#include "GrRectanizer.h"
	#include "GrTracing.h"

	////////////////////////////////////////////////////////////////////////////////

	GrBatchAtlas::BatchPlot::BatchPlot(int index, uint64_t genID, int offX, int offY, int width,
	int height, GrPixelConfig config)
	: fLastUpload(GrBatchDrawToken::AlreadyFlushedToken())
	, fLastUse(GrBatchDrawToken::AlreadyFlushedToken())
	, fIndex(index)
	, fGenID(genID)
	, fID(CreateId(fIndex, fGenID))
	, fData(nullptr)
	, fWidth(width)
	, fHeight(height)
	, fX(offX)
	, fY(offY)
	, fRects(nullptr)
	, fOffset(SkIPoint16::Make(fX * fWidth, fY * fHeight))
	, fConfig(config)
	, fBytesPerPixel(GrBytesPerPixel(config))
	#ifdef SK_DEBUG
	, fDirty(false)
	#endif
	{
	fDirtyRect.setEmpty();
	}

	GrBatchAtlas::BatchPlot::~BatchPlot() {
	sk_free(fData);
	delete fRects;
	}

	bool GrBatchAtlas::BatchPlot::addSubImage(int width, int height, const void* image,
	SkIPoint16* loc) {
	SkASSERT(width <= fWidth && height <= fHeight);

	if (!fRects) {
	fRects = GrRectanizer::Factory(fWidth, fHeight);
	}

	if (!fRects->addRect(width, height, loc)) {
	return false;
	}

	if (!fData) {
	fData = reinterpret_cast<unsigned char>(sk_calloc_throw(fBytesPerPixel fWidth *
	fHeight));
	}
	size_t rowBytes = width * fBytesPerPixel;
	const unsigned char* imagePtr = (const unsigned char*)image;
	// point ourselves at the right starting spot
	unsigned char* dataPtr = fData;
	dataPtr += fBytesPerPixel * fWidth * loc->fY;
	dataPtr += fBytesPerPixel * loc->fX;
	// copy into the data buffer, swizzling as we go if this is ARGB data
	if (4 == fBytesPerPixel && kSkia8888_GrPixelConfig == kBGRA_8888_GrPixelConfig) {
	for (int i = 0; i < height; ++i) {
	SkOpts::RGBA_to_BGRA(reinterpret_cast<uint32_t*>(dataPtr), imagePtr, width);
	dataPtr += fBytesPerPixel * fWidth;
	imagePtr += rowBytes;
	}
	} else {
	for (int i = 0; i < height; ++i) {
	memcpy(dataPtr, imagePtr, rowBytes);
	dataPtr += fBytesPerPixel * fWidth;
	imagePtr += rowBytes;
	}
	}

	fDirtyRect.join(loc->fX, loc->fY, loc->fX + width, loc->fY + height);

	loc->fX += fOffset.fX;
	loc->fY += fOffset.fY;
	SkDEBUGCODE(fDirty = true;)

	return true;
	}

	void GrBatchAtlas::BatchPlot::uploadToTexture(GrDrawBatch::WritePixelsFn& writePixels,
	GrTexture* texture) {
	// We should only be issuing uploads if we are in fact dirty
	SkASSERT(fDirty && fData && texture);
	TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("skia.gpu"), "GrBatchPlot::uploadToTexture");
	size_t rowBytes = fBytesPerPixel * fWidth;
	const unsigned char* dataPtr = fData;
	dataPtr += rowBytes * fDirtyRect.fTop;
	dataPtr += fBytesPerPixel * fDirtyRect.fLeft;
	writePixels(texture, fOffset.fX + fDirtyRect.fLeft, fOffset.fY + fDirtyRect.fTop,
	fDirtyRect.width(), fDirtyRect.height(), fConfig, dataPtr, rowBytes);
	fDirtyRect.setEmpty();
	SkDEBUGCODE(fDirty = false;)
	}

	void GrBatchAtlas::BatchPlot::resetRects() {
	if (fRects) {
	fRects->reset();
	}

	fGenID++;
	fID = CreateId(fIndex, fGenID);

	// zero out the plot
	if (fData) {
	sk_bzero(fData, fBytesPerPixel * fWidth * fHeight);
	}

	fDirtyRect.setEmpty();
	SkDEBUGCODE(fDirty = false;)
	}

	///////////////////////////////////////////////////////////////////////////////

	GrBatchAtlas::GrBatchAtlas(GrTexture* texture, int numPlotsX, int numPlotsY)
	: fTexture(texture)
	, fAtlasGeneration(kInvalidAtlasGeneration + 1) {

	fPlotWidth = texture->width() / numPlotsX;
	fPlotHeight = texture->height() / numPlotsY;
	SkASSERT(numPlotsX * numPlotsY <= BulkUseTokenUpdater::kMaxPlots);
	SkASSERT(fPlotWidth * numPlotsX == texture->width());
	SkASSERT(fPlotHeight * numPlotsY == texture->height());

	SkDEBUGCODE(fNumPlots = numPlotsX * numPlotsY;)

	// We currently do not support compressed atlases...
	SkASSERT(!GrPixelConfigIsCompressed(texture->desc().fConfig));

	// set up allocated plots
	fPlotArray = new SkAutoTUnref<BatchPlot>[numPlotsX * numPlotsY];

	SkAutoTUnref<BatchPlot>* currPlot = fPlotArray;
	for (int y = numPlotsY - 1, r = 0; y >= 0; --y, ++r) {
	for (int x = numPlotsX - 1, c = 0; x >= 0; --x, ++c) {
	uint32_t index = r * numPlotsX + c;
	currPlot->reset(new BatchPlot(index, 1, x, y, fPlotWidth, fPlotHeight,
	texture->desc().fConfig));

	// build LRU list
	fPlotList.addToHead(currPlot->get());
	++currPlot;
	}
	}
	}

	GrBatchAtlas::~GrBatchAtlas() {
	SkSafeUnref(fTexture);
	delete[] fPlotArray;
	}

	void GrBatchAtlas::processEviction(AtlasID id) {
	for (int i = 0; i < fEvictionCallbacks.count(); i++) {
	(*fEvictionCallbacks[i].fFunc)(id, fEvictionCallbacks[i].fData);
	}
	}

	inline void GrBatchAtlas::updatePlot(GrDrawBatch::Target* target, AtlasID* id, BatchPlot* plot) {
	this->makeMRU(plot);

	// If our most recent upload has already occurred then we have to insert a new
	// upload. Otherwise, we already have a scheduled upload that hasn't yet ocurred.
	// This new update will piggy back on that previously scheduled update.
	if (target->hasDrawBeenFlushed(plot->lastUploadToken())) {
	// With c+14 we could move sk_sp into lamba to only ref once.
	sk_sp<BatchPlot> plotsp(SkRef(plot));
	GrTexture* texture = fTexture;
	GrBatchDrawToken lastUploadToken = target->addAsapUpload(
	[plotsp, texture] (GrDrawBatch::WritePixelsFn& writePixels) {
	plotsp->uploadToTexture(writePixels, texture);
	}
	);
	plot->setLastUploadToken(lastUploadToken);
	}
	*id = plot->id();
	}

	bool GrBatchAtlas::addToAtlas(AtlasID* id, GrDrawBatch::Target* target,
	int width, int height, const void* image, SkIPoint16* loc) {
	// We should already have a texture, TODO clean this up
	SkASSERT(fTexture);
	if (width > fPlotWidth \|\| height > fPlotHeight) {
	return false;
	}

	// now look through all allocated plots for one we can share, in Most Recently Refed order
	GrBatchPlotList::Iter plotIter;
	plotIter.init(fPlotList, GrBatchPlotList::Iter::kHead_IterStart);
	BatchPlot* plot;
	while ((plot = plotIter.get())) {
	SkASSERT(GrBytesPerPixel(fTexture->desc().fConfig) == plot->bpp());
	if (plot->addSubImage(width, height, image, loc)) {
	this->updatePlot(target, id, plot);
	return true;
	}
	plotIter.next();
	}

	// If the above fails, then see if the least recently refed plot has already been flushed to the
	// gpu
	plot = fPlotList.tail();
	SkASSERT(plot);
	if (target->hasDrawBeenFlushed(plot->lastUseToken())) {
	this->processEviction(plot->id());
	plot->resetRects();
	SkASSERT(GrBytesPerPixel(fTexture->desc().fConfig) == plot->bpp());
	SkDEBUGCODE(bool verify = )plot->addSubImage(width, height, image, loc);
	SkASSERT(verify);
	this->updatePlot(target, id, plot);
	fAtlasGeneration++;
	return true;
	}

	// If this plot has been used in a draw that is currently being prepared by a batch, then we
	// have to fail. This gives the batch a chance to enqueue the draw, and call back into this
	// function. When that draw is enqueued, the draw token advances, and the subsequent call will
	// continue past this branch and prepare an inline upload that will occur after the enqueued
	// draw which references the plot's pre-upload content.
	if (plot->lastUseToken() == target->nextDrawToken()) {
	return false;
	}

	this->processEviction(plot->id());
	fPlotList.remove(plot);
	SkAutoTUnref<BatchPlot>& newPlot = fPlotArray[plot->index()];
	newPlot.reset(plot->clone());

	fPlotList.addToHead(newPlot.get());
	SkASSERT(GrBytesPerPixel(fTexture->desc().fConfig) == newPlot->bpp());
	SkDEBUGCODE(bool verify = )newPlot->addSubImage(width, height, image, loc);
	SkASSERT(verify);

	// Note that this plot will be uploaded inline with the draws whereas the
	// one it displaced most likely was uploaded asap.
	// With c+14 we could move sk_sp into lamba to only ref once.
	sk_sp<BatchPlot> plotsp(SkRef(newPlot.get()));
	GrTexture* texture = fTexture;
	GrBatchDrawToken lastUploadToken = target->addInlineUpload(
	[plotsp, texture] (GrDrawBatch::WritePixelsFn& writePixels) {
	plotsp->uploadToTexture(writePixels, texture);
	}
	);
	newPlot->setLastUploadToken(lastUploadToken);

	*id = newPlot->id();

	fAtlasGeneration++;
	return true;
	}