src/third_party/skia/src/gpu/GrLayerHoister.cpp - cobalt - Git at Google

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #include "GrLayerCache.h"
 #include "GrLayerHoister.h"
 #include "SkCanvas.h"
 #include "SkRecordDraw.h"
 #include "GrRecordReplaceDraw.h"
 #include "SkGrPixelRef.h"
 #include "SkSurface.h"

 // Return true if any layers are suitable for hoisting
 bool GrLayerHoister::FindLayersToHoist(const SkPicture* topLevelPicture,
                                        const SkRect& query,
                                        SkTDArray<HoistedLayer>* atlased,
                                        SkTDArray<HoistedLayer>* nonAtlased,
                                        GrLayerCache* layerCache) {
     bool anyHoisted = false;

     SkPicture::AccelData::Key key = GrAccelData::ComputeAccelDataKey();

     const SkPicture::AccelData* topLevelData = topLevelPicture->EXPERIMENTAL_getAccelData(key);
     if (NULL == topLevelData) {
         return false;
     }

     const GrAccelData *topLevelGPUData = static_cast<const GrAccelData*>(topLevelData);
     if (0 == topLevelGPUData->numSaveLayers()) {
         return false;
     }

     // Layer hoisting pre-renders the entire layer since it will be cached and potentially
     // reused with different clips (e.g., in different tiles). Because of this the
     // clip will not be limiting the size of the pre-rendered layer. kSaveLayerMaxSize
     // is used to limit which clips are pre-rendered.
     static const int kSaveLayerMaxSize = 256;

     SkAutoTArray<bool> pullForward(topLevelGPUData->numSaveLayers());

     // Pre-render all the layers that intersect the query rect
     for (int i = 0; i < topLevelGPUData->numSaveLayers(); ++i) {
         pullForward[i] = false;

         const GrAccelData::SaveLayerInfo& info = topLevelGPUData->saveLayerInfo(i);

         SkRect layerRect = SkRect::MakeXYWH(SkIntToScalar(info.fOffset.fX),
                                             SkIntToScalar(info.fOffset.fY),
                                             SkIntToScalar(info.fSize.fWidth),
                                             SkIntToScalar(info.fSize.fHeight));

         if (!SkRect::Intersects(query, layerRect)) {
             continue;
         }

         // TODO: once this code is more stable unsuitable layers can
         // just be omitted during the optimization stage
         if (!info.fValid ||
             kSaveLayerMaxSize < info.fSize.fWidth ||
             kSaveLayerMaxSize < info.fSize.fHeight ||
             info.fIsNested) {
             continue;
         }

         pullForward[i] = true;
         anyHoisted = true;
     }

     if (!anyHoisted) {
         return false;
     }

     atlased->setReserve(atlased->reserved() + topLevelGPUData->numSaveLayers());

     // Generate the layer and/or ensure it is locked
     for (int i = 0; i < topLevelGPUData->numSaveLayers(); ++i) {
         if (pullForward[i]) {
             const GrAccelData::SaveLayerInfo& info = topLevelGPUData->saveLayerInfo(i);
             const SkPicture* pict = info.fPicture ? info.fPicture : topLevelPicture;

             GrCachedLayer* layer = layerCache->findLayerOrCreate(pict->uniqueID(),
                                                                  info.fSaveLayerOpID,
                                                                  info.fRestoreOpID,
                                                                  info.fOffset,
                                                                  info.fOriginXform,
                                                                  info.fPaint);

             GrTextureDesc desc;
             desc.fFlags = kRenderTarget_GrTextureFlagBit;
             desc.fWidth = info.fSize.fWidth;
             desc.fHeight = info.fSize.fHeight;
             desc.fConfig = kSkia8888_GrPixelConfig;
             // TODO: need to deal with sample count

             bool needsRendering = layerCache->lock(layer, desc,
                                                    info.fHasNestedLayers || info.fIsNested);
             if (NULL == layer->texture()) {
                 continue;
             }

             if (needsRendering) {
                 HoistedLayer* info;

                 if (layer->isAtlased()) {
                     info = atlased->append();
                 } else {
                     info = nonAtlased->append();
                 }

                 info->fLayer = layer;
                 info->fPicture = pict;
             }
         }
     }

     return anyHoisted;
 }

 static void wrap_texture(GrTexture* texture, int width, int height, SkBitmap* result) {
     SkImageInfo info = SkImageInfo::MakeN32Premul(width, height);
     result->setInfo(info);
     result->setPixelRef(SkNEW_ARGS(SkGrPixelRef, (info, texture)))->unref();
 }

 static void convert_layers_to_replacements(const SkTDArray<GrLayerHoister::HoistedLayer>& layers,
                                            GrReplacements* replacements) {
     // TODO: just replace GrReplacements::ReplacementInfo with GrCachedLayer?
     for (int i = 0; i < layers.count(); ++i) {
         GrReplacements::ReplacementInfo* layerInfo = replacements->push();
         layerInfo->fStart = layers[i].fLayer->start();
         layerInfo->fStop = layers[i].fLayer->stop();
         layerInfo->fPos = layers[i].fLayer->offset();;

         SkBitmap bm;
         wrap_texture(layers[i].fLayer->texture(),
                      !layers[i].fLayer->isAtlased() ? layers[i].fLayer->rect().width()
                                                     : layers[i].fLayer->texture()->width(),
                      !layers[i].fLayer->isAtlased() ? layers[i].fLayer->rect().height()
                                                     : layers[i].fLayer->texture()->height(),
                      &bm);
         layerInfo->fImage = SkImage::NewTexture(bm);

         layerInfo->fPaint = layers[i].fLayer->paint()
                                 ? SkNEW_ARGS(SkPaint, (*layers[i].fLayer->paint()))
                                 : NULL;

         layerInfo->fSrcRect = SkIRect::MakeXYWH(layers[i].fLayer->rect().fLeft,
                                                 layers[i].fLayer->rect().fTop,
                                                 layers[i].fLayer->rect().width(),
                                                 layers[i].fLayer->rect().height());
     }
 }

 void GrLayerHoister::DrawLayers(const SkTDArray<HoistedLayer>& atlased,
                                 const SkTDArray<HoistedLayer>& nonAtlased,
                                 GrReplacements* replacements) {
     // Render the atlased layers that require it
     if (atlased.count() > 0) {
         // All the atlased layers are rendered into the same GrTexture
         SkAutoTUnref<SkSurface> surface(SkSurface::NewRenderTargetDirect(
                                         atlased[0].fLayer->texture()->asRenderTarget(), NULL));

         SkCanvas* atlasCanvas = surface->getCanvas();

         SkPaint paint;
         paint.setColor(SK_ColorTRANSPARENT);
         paint.setXfermode(SkXfermode::Create(SkXfermode::kSrc_Mode))->unref();

         for (int i = 0; i < atlased.count(); ++i) {
             GrCachedLayer* layer = atlased[i].fLayer;
             const SkPicture* pict = atlased[i].fPicture;

             atlasCanvas->save();

             // Add a rect clip to make sure the rendering doesn't
             // extend beyond the boundaries of the atlased sub-rect
             SkRect bound = SkRect::MakeXYWH(SkIntToScalar(layer->rect().fLeft),
                                             SkIntToScalar(layer->rect().fTop),
                                             SkIntToScalar(layer->rect().width()),
                                             SkIntToScalar(layer->rect().height()));
             atlasCanvas->clipRect(bound);

             // Since 'clear' doesn't respect the clip we need to draw a rect
             // TODO: ensure none of the atlased layers contain a clear call!
             atlasCanvas->drawRect(bound, paint);

             // info.fCTM maps the layer's top/left to the origin.
             // Since this layer is atlased, the top/left corner needs
             // to be offset to the correct location in the backing texture.
             SkMatrix initialCTM;
             initialCTM.setTranslate(SkIntToScalar(-layer->offset().fX),
                                     SkIntToScalar(-layer->offset().fY));
             initialCTM.postTranslate(bound.fLeft, bound.fTop);

             atlasCanvas->translate(SkIntToScalar(-layer->offset().fX),
                                    SkIntToScalar(-layer->offset().fY));
             atlasCanvas->translate(bound.fLeft, bound.fTop);
             atlasCanvas->concat(layer->ctm());

             SkRecordPartialDraw(*pict->fRecord.get(), atlasCanvas, bound,
                                 layer->start()+1, layer->stop(), initialCTM);

             atlasCanvas->restore();
         }

         atlasCanvas->flush();
     }

     // Render the non-atlased layers that require it
     for (int i = 0; i < nonAtlased.count(); ++i) {
         GrCachedLayer* layer = nonAtlased[i].fLayer;
         const SkPicture* pict = nonAtlased[i].fPicture;

         // Each non-atlased layer has its own GrTexture
         SkAutoTUnref<SkSurface> surface(SkSurface::NewRenderTargetDirect(
                                         layer->texture()->asRenderTarget(), NULL));

         SkCanvas* layerCanvas = surface->getCanvas();

         // Add a rect clip to make sure the rendering doesn't
         // extend beyond the boundaries of the atlased sub-rect
         SkRect bound = SkRect::MakeXYWH(SkIntToScalar(layer->rect().fLeft),
                                         SkIntToScalar(layer->rect().fTop),
                                         SkIntToScalar(layer->rect().width()),
                                         SkIntToScalar(layer->rect().height()));

         layerCanvas->clipRect(bound); // TODO: still useful?

         layerCanvas->clear(SK_ColorTRANSPARENT);

         SkMatrix initialCTM;
         initialCTM.setTranslate(SkIntToScalar(-layer->offset().fX),
                                 SkIntToScalar(-layer->offset().fY));

         layerCanvas->translate(SkIntToScalar(-layer->offset().fX),
                                SkIntToScalar(-layer->offset().fY));
         layerCanvas->concat(layer->ctm());

         SkRecordPartialDraw(*pict->fRecord.get(), layerCanvas, bound,
                             layer->start()+1, layer->stop(), initialCTM);

         layerCanvas->flush();
     }

     convert_layers_to_replacements(atlased, replacements);
     convert_layers_to_replacements(nonAtlased, replacements);
 }

 static void unlock_layer_in_cache(GrLayerCache* layerCache,
                                   const SkPicture* picture,
                                   GrCachedLayer* layer) {
     layerCache->unlock(layer);

 #if DISABLE_CACHING
     // This code completely clears out the atlas. It is required when
     // caching is disabled so the atlas doesn't fill up and force more
     // free floating layers
     layerCache->purge(picture->uniqueID());
 #endif
 }

 void GrLayerHoister::UnlockLayers(GrLayerCache* layerCache,
                                   const SkTDArray<HoistedLayer>& atlased,
                                   const SkTDArray<HoistedLayer>& nonAtlased) {

     for (int i = 0; i < atlased.count(); ++i) {
         unlock_layer_in_cache(layerCache, atlased[i].fPicture, atlased[i].fLayer);
     }

     for (int i = 0; i < nonAtlased.count(); ++i) {
         unlock_layer_in_cache(layerCache, nonAtlased[i].fPicture, nonAtlased[i].fLayer);
     }

 #if DISABLE_CACHING
     // This code completely clears out the atlas. It is required when
     // caching is disabled so the atlas doesn't fill up and force more
     // free floating layers
     layerCache->purgeAll();
 #endif
 }
	/*
	* Copyright 2014 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#include "GrLayerCache.h"
	#include "GrLayerHoister.h"
	#include "SkCanvas.h"
	#include "SkRecordDraw.h"
	#include "GrRecordReplaceDraw.h"
	#include "SkGrPixelRef.h"
	#include "SkSurface.h"

	// Return true if any layers are suitable for hoisting
	bool GrLayerHoister::FindLayersToHoist(const SkPicture* topLevelPicture,
	const SkRect& query,
	SkTDArray<HoistedLayer>* atlased,
	SkTDArray<HoistedLayer>* nonAtlased,
	GrLayerCache* layerCache) {
	bool anyHoisted = false;

	SkPicture::AccelData::Key key = GrAccelData::ComputeAccelDataKey();

	const SkPicture::AccelData* topLevelData = topLevelPicture->EXPERIMENTAL_getAccelData(key);
	if (NULL == topLevelData) {
	return false;
	}

	const GrAccelData topLevelGPUData = static_cast<const GrAccelData>(topLevelData);
	if (0 == topLevelGPUData->numSaveLayers()) {
	return false;
	}

	// Layer hoisting pre-renders the entire layer since it will be cached and potentially
	// reused with different clips (e.g., in different tiles). Because of this the
	// clip will not be limiting the size of the pre-rendered layer. kSaveLayerMaxSize
	// is used to limit which clips are pre-rendered.
	static const int kSaveLayerMaxSize = 256;

	SkAutoTArray<bool> pullForward(topLevelGPUData->numSaveLayers());

	// Pre-render all the layers that intersect the query rect
	for (int i = 0; i < topLevelGPUData->numSaveLayers(); ++i) {
	pullForward[i] = false;

	const GrAccelData::SaveLayerInfo& info = topLevelGPUData->saveLayerInfo(i);

	SkRect layerRect = SkRect::MakeXYWH(SkIntToScalar(info.fOffset.fX),
	SkIntToScalar(info.fOffset.fY),
	SkIntToScalar(info.fSize.fWidth),
	SkIntToScalar(info.fSize.fHeight));

	if (!SkRect::Intersects(query, layerRect)) {
	continue;
	}

	// TODO: once this code is more stable unsuitable layers can
	// just be omitted during the optimization stage
	if (!info.fValid \|\|
	kSaveLayerMaxSize < info.fSize.fWidth \|\|
	kSaveLayerMaxSize < info.fSize.fHeight \|\|
	info.fIsNested) {
	continue;
	}

	pullForward[i] = true;
	anyHoisted = true;
	}

	if (!anyHoisted) {
	return false;
	}

	atlased->setReserve(atlased->reserved() + topLevelGPUData->numSaveLayers());

	// Generate the layer and/or ensure it is locked
	for (int i = 0; i < topLevelGPUData->numSaveLayers(); ++i) {
	if (pullForward[i]) {
	const GrAccelData::SaveLayerInfo& info = topLevelGPUData->saveLayerInfo(i);
	const SkPicture* pict = info.fPicture ? info.fPicture : topLevelPicture;

	GrCachedLayer* layer = layerCache->findLayerOrCreate(pict->uniqueID(),
	info.fSaveLayerOpID,
	info.fRestoreOpID,
	info.fOffset,
	info.fOriginXform,
	info.fPaint);

	GrTextureDesc desc;
	desc.fFlags = kRenderTarget_GrTextureFlagBit;
	desc.fWidth = info.fSize.fWidth;
	desc.fHeight = info.fSize.fHeight;
	desc.fConfig = kSkia8888_GrPixelConfig;
	// TODO: need to deal with sample count

	bool needsRendering = layerCache->lock(layer, desc,
	info.fHasNestedLayers \|\| info.fIsNested);
	if (NULL == layer->texture()) {
	continue;
	}

	if (needsRendering) {
	HoistedLayer* info;

	if (layer->isAtlased()) {
	info = atlased->append();
	} else {
	info = nonAtlased->append();
	}

	info->fLayer = layer;
	info->fPicture = pict;
	}
	}
	}

	return anyHoisted;
	}

	static void wrap_texture(GrTexture* texture, int width, int height, SkBitmap* result) {
	SkImageInfo info = SkImageInfo::MakeN32Premul(width, height);
	result->setInfo(info);
	result->setPixelRef(SkNEW_ARGS(SkGrPixelRef, (info, texture)))->unref();
	}

	static void convert_layers_to_replacements(const SkTDArray<GrLayerHoister::HoistedLayer>& layers,
	GrReplacements* replacements) {
	// TODO: just replace GrReplacements::ReplacementInfo with GrCachedLayer?
	for (int i = 0; i < layers.count(); ++i) {
	GrReplacements::ReplacementInfo* layerInfo = replacements->push();
	layerInfo->fStart = layers[i].fLayer->start();
	layerInfo->fStop = layers[i].fLayer->stop();
	layerInfo->fPos = layers[i].fLayer->offset();;

	SkBitmap bm;
	wrap_texture(layers[i].fLayer->texture(),
	!layers[i].fLayer->isAtlased() ? layers[i].fLayer->rect().width()
	: layers[i].fLayer->texture()->width(),
	!layers[i].fLayer->isAtlased() ? layers[i].fLayer->rect().height()
	: layers[i].fLayer->texture()->height(),
	&bm);
	layerInfo->fImage = SkImage::NewTexture(bm);

	layerInfo->fPaint = layers[i].fLayer->paint()
	? SkNEW_ARGS(SkPaint, (*layers[i].fLayer->paint()))
	: NULL;

	layerInfo->fSrcRect = SkIRect::MakeXYWH(layers[i].fLayer->rect().fLeft,
	layers[i].fLayer->rect().fTop,
	layers[i].fLayer->rect().width(),
	layers[i].fLayer->rect().height());
	}
	}

	void GrLayerHoister::DrawLayers(const SkTDArray<HoistedLayer>& atlased,
	const SkTDArray<HoistedLayer>& nonAtlased,
	GrReplacements* replacements) {
	// Render the atlased layers that require it
	if (atlased.count() > 0) {
	// All the atlased layers are rendered into the same GrTexture
	SkAutoTUnref<SkSurface> surface(SkSurface::NewRenderTargetDirect(
	atlased[0].fLayer->texture()->asRenderTarget(), NULL));

	SkCanvas* atlasCanvas = surface->getCanvas();

	SkPaint paint;
	paint.setColor(SK_ColorTRANSPARENT);
	paint.setXfermode(SkXfermode::Create(SkXfermode::kSrc_Mode))->unref();

	for (int i = 0; i < atlased.count(); ++i) {
	GrCachedLayer* layer = atlased[i].fLayer;
	const SkPicture* pict = atlased[i].fPicture;

	atlasCanvas->save();

	// Add a rect clip to make sure the rendering doesn't
	// extend beyond the boundaries of the atlased sub-rect
	SkRect bound = SkRect::MakeXYWH(SkIntToScalar(layer->rect().fLeft),
	SkIntToScalar(layer->rect().fTop),
	SkIntToScalar(layer->rect().width()),
	SkIntToScalar(layer->rect().height()));
	atlasCanvas->clipRect(bound);

	// Since 'clear' doesn't respect the clip we need to draw a rect
	// TODO: ensure none of the atlased layers contain a clear call!
	atlasCanvas->drawRect(bound, paint);

	// info.fCTM maps the layer's top/left to the origin.
	// Since this layer is atlased, the top/left corner needs
	// to be offset to the correct location in the backing texture.
	SkMatrix initialCTM;
	initialCTM.setTranslate(SkIntToScalar(-layer->offset().fX),
	SkIntToScalar(-layer->offset().fY));
	initialCTM.postTranslate(bound.fLeft, bound.fTop);

	atlasCanvas->translate(SkIntToScalar(-layer->offset().fX),
	SkIntToScalar(-layer->offset().fY));
	atlasCanvas->translate(bound.fLeft, bound.fTop);
	atlasCanvas->concat(layer->ctm());

	SkRecordPartialDraw(*pict->fRecord.get(), atlasCanvas, bound,
	layer->start()+1, layer->stop(), initialCTM);

	atlasCanvas->restore();
	}

	atlasCanvas->flush();
	}

	// Render the non-atlased layers that require it
	for (int i = 0; i < nonAtlased.count(); ++i) {
	GrCachedLayer* layer = nonAtlased[i].fLayer;
	const SkPicture* pict = nonAtlased[i].fPicture;

	// Each non-atlased layer has its own GrTexture
	SkAutoTUnref<SkSurface> surface(SkSurface::NewRenderTargetDirect(
	layer->texture()->asRenderTarget(), NULL));

	SkCanvas* layerCanvas = surface->getCanvas();

	// Add a rect clip to make sure the rendering doesn't
	// extend beyond the boundaries of the atlased sub-rect
	SkRect bound = SkRect::MakeXYWH(SkIntToScalar(layer->rect().fLeft),
	SkIntToScalar(layer->rect().fTop),
	SkIntToScalar(layer->rect().width()),
	SkIntToScalar(layer->rect().height()));

	layerCanvas->clipRect(bound); // TODO: still useful?

	layerCanvas->clear(SK_ColorTRANSPARENT);

	SkMatrix initialCTM;
	initialCTM.setTranslate(SkIntToScalar(-layer->offset().fX),
	SkIntToScalar(-layer->offset().fY));

	layerCanvas->translate(SkIntToScalar(-layer->offset().fX),
	SkIntToScalar(-layer->offset().fY));
	layerCanvas->concat(layer->ctm());

	SkRecordPartialDraw(*pict->fRecord.get(), layerCanvas, bound,
	layer->start()+1, layer->stop(), initialCTM);

	layerCanvas->flush();
	}

	convert_layers_to_replacements(atlased, replacements);
	convert_layers_to_replacements(nonAtlased, replacements);
	}

	static void unlock_layer_in_cache(GrLayerCache* layerCache,
	const SkPicture* picture,
	GrCachedLayer* layer) {
	layerCache->unlock(layer);

	#if DISABLE_CACHING
	// This code completely clears out the atlas. It is required when
	// caching is disabled so the atlas doesn't fill up and force more
	// free floating layers
	layerCache->purge(picture->uniqueID());
	#endif
	}

	void GrLayerHoister::UnlockLayers(GrLayerCache* layerCache,
	const SkTDArray<HoistedLayer>& atlased,
	const SkTDArray<HoistedLayer>& nonAtlased) {

	for (int i = 0; i < atlased.count(); ++i) {
	unlock_layer_in_cache(layerCache, atlased[i].fPicture, atlased[i].fLayer);
	}

	for (int i = 0; i < nonAtlased.count(); ++i) {
	unlock_layer_in_cache(layerCache, nonAtlased[i].fPicture, nonAtlased[i].fLayer);
	}

	#if DISABLE_CACHING
	// This code completely clears out the atlas. It is required when
	// caching is disabled so the atlas doesn't fill up and force more
	// free floating layers
	layerCache->purgeAll();
	#endif
	}