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/*
* 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 "GrRecordReplaceDraw.h"
#include "SkCanvas.h"
#include "SkDeviceImageFilterProxy.h"
#include "SkDeviceProperties.h"
#include "SkGpuDevice.h"
#include "SkGrPixelRef.h"
#include "SkLayerInfo.h"
#include "SkRecordDraw.h"
#include "SkSurface.h"
#include "SkSurface_Gpu.h"
// Create the layer information for the hoisted layer and secure the
// required texture/render target resources.
static void prepare_for_hoisting(GrLayerCache* layerCache,
const SkPicture* topLevelPicture,
const SkMatrix& initialMat,
const SkLayerInfo::BlockInfo& info,
const SkIRect& srcIR,
const SkIRect& dstIR,
SkTDArray<GrHoistedLayer>* needRendering,
SkTDArray<GrHoistedLayer>* recycled,
bool attemptToAtlas,
int numSamples) {
const SkPicture* pict = info.fPicture ? info.fPicture : topLevelPicture;
GrCachedLayer* layer = layerCache->findLayerOrCreate(topLevelPicture->uniqueID(),
SkToInt(info.fSaveLayerOpID),
SkToInt(info.fRestoreOpID),
srcIR,
dstIR,
initialMat,
info.fKey,
info.fKeySize,
info.fPaint);
GrSurfaceDesc desc;
desc.fFlags = kRenderTarget_GrSurfaceFlag;
desc.fWidth = srcIR.width();
desc.fHeight = srcIR.height();
desc.fConfig = kSkia8888_GrPixelConfig;
desc.fSampleCnt = numSamples;
bool locked, needsRendering;
if (attemptToAtlas) {
locked = layerCache->tryToAtlas(layer, desc, &needsRendering);
} else {
locked = layerCache->lock(layer, desc, &needsRendering);
}
if (!locked) {
// GPU resources could not be secured for the hoisting of this layer
return;
}
if (attemptToAtlas) {
SkASSERT(layer->isAtlased());
}
GrHoistedLayer* hl;
if (needsRendering) {
if (!attemptToAtlas) {
SkASSERT(!layer->isAtlased());
}
hl = needRendering->append();
} else {
hl = recycled->append();
}
layerCache->addUse(layer);
hl->fLayer = layer;
hl->fPicture = pict;
hl->fLocalMat = info.fLocalMat;
hl->fInitialMat = initialMat;
hl->fPreMat = initialMat;
hl->fPreMat.preConcat(info.fPreMat);
}
// Compute the source rect and return false if it is empty.
static bool compute_source_rect(const SkLayerInfo::BlockInfo& info, const SkMatrix& initialMat,
const SkIRect& dstIR, SkIRect* srcIR) {
SkIRect clipBounds = dstIR;
SkMatrix totMat = initialMat;
totMat.preConcat(info.fPreMat);
totMat.preConcat(info.fLocalMat);
if (info.fPaint && info.fPaint->getImageFilter()) {
info.fPaint->getImageFilter()->filterBounds(clipBounds, totMat, &clipBounds);
}
if (!info.fSrcBounds.isEmpty()) {
SkRect r;
totMat.mapRect(&r, info.fSrcBounds);
r.roundOut(srcIR);
if (!srcIR->intersect(clipBounds)) {
return false;
}
} else {
*srcIR = clipBounds;
}
return true;
}
// Atlased layers must be small enough to fit in the atlas, not have a
// paint with an image filter and be neither nested nor nesting.
// TODO: allow leaf nested layers to appear in the atlas.
void GrLayerHoister::FindLayersToAtlas(GrContext* context,
const SkPicture* topLevelPicture,
const SkMatrix& initialMat,
const SkRect& query,
SkTDArray<GrHoistedLayer>* atlased,
SkTDArray<GrHoistedLayer>* recycled,
int numSamples) {
if (0 != numSamples) {
// MSAA layers are currently never atlased
return;
}
GrLayerCache* layerCache = context->getLayerCache();
layerCache->processDeletedPictures();
SkPicture::AccelData::Key key = SkLayerInfo::ComputeKey();
const SkPicture::AccelData* topLevelData = topLevelPicture->EXPERIMENTAL_getAccelData(key);
if (!topLevelData) {
return;
}
const SkLayerInfo *topLevelGPUData = static_cast<const SkLayerInfo*>(topLevelData);
if (0 == topLevelGPUData->numBlocks()) {
return;
}
atlased->setReserve(atlased->count() + topLevelGPUData->numBlocks());
for (int i = 0; i < topLevelGPUData->numBlocks(); ++i) {
const SkLayerInfo::BlockInfo& info = topLevelGPUData->block(i);
// TODO: ignore perspective projected layers here?
bool disallowAtlasing = info.fHasNestedLayers || info.fIsNested ||
(info.fPaint && info.fPaint->getImageFilter());
if (disallowAtlasing) {
continue;
}
SkRect layerRect;
initialMat.mapRect(&layerRect, info.fBounds);
if (!layerRect.intersect(query)) {
continue;
}
const SkIRect dstIR = layerRect.roundOut();
SkIRect srcIR;
if (!compute_source_rect(info, initialMat, dstIR, &srcIR) ||
!GrLayerCache::PlausiblyAtlasable(srcIR.width(), srcIR.height())) {
continue;
}
prepare_for_hoisting(layerCache, topLevelPicture, initialMat,
info, srcIR, dstIR, atlased, recycled, true, 0);
}
}
void GrLayerHoister::FindLayersToHoist(GrContext* context,
const SkPicture* topLevelPicture,
const SkMatrix& initialMat,
const SkRect& query,
SkTDArray<GrHoistedLayer>* needRendering,
SkTDArray<GrHoistedLayer>* recycled,
int numSamples) {
GrLayerCache* layerCache = context->getLayerCache();
layerCache->processDeletedPictures();
SkPicture::AccelData::Key key = SkLayerInfo::ComputeKey();
const SkPicture::AccelData* topLevelData = topLevelPicture->EXPERIMENTAL_getAccelData(key);
if (!topLevelData) {
return;
}
const SkLayerInfo *topLevelGPUData = static_cast<const SkLayerInfo*>(topLevelData);
if (0 == topLevelGPUData->numBlocks()) {
return;
}
// Find and prepare for hoisting all the layers that intersect the query rect
for (int i = 0; i < topLevelGPUData->numBlocks(); ++i) {
const SkLayerInfo::BlockInfo& info = topLevelGPUData->block(i);
if (info.fIsNested) {
// Parent layers are currently hoisted while nested layers are not.
continue;
}
SkRect layerRect;
initialMat.mapRect(&layerRect, info.fBounds);
if (!layerRect.intersect(query)) {
continue;
}
const SkIRect dstIR = layerRect.roundOut();
SkIRect srcIR;
if (!compute_source_rect(info, initialMat, dstIR, &srcIR)) {
continue;
}
prepare_for_hoisting(layerCache, topLevelPicture, initialMat, info, srcIR, dstIR,
needRendering, recycled, false, numSamples);
}
}
void GrLayerHoister::DrawLayersToAtlas(GrContext* context,
const SkTDArray<GrHoistedLayer>& atlased) {
if (atlased.count() > 0) {
// All the atlased layers are rendered into the same GrTexture
SkSurfaceProps props(0, kUnknown_SkPixelGeometry);
SkAutoTUnref<SkSurface> surface(SkSurface::NewRenderTargetDirect(
atlased[0].fLayer->texture()->asRenderTarget(), &props));
SkCanvas* atlasCanvas = surface->getCanvas();
for (int i = 0; i < atlased.count(); ++i) {
const GrCachedLayer* layer = atlased[i].fLayer;
const SkPicture* pict = atlased[i].fPicture;
const SkIPoint offset = SkIPoint::Make(layer->srcIR().fLeft, layer->srcIR().fTop);
SkDEBUGCODE(const SkPaint* layerPaint = layer->paint();)
SkASSERT(!layerPaint || !layerPaint->getImageFilter());
SkASSERT(!layer->filter());
atlasCanvas->save();
// Add a rect clip to make sure the rendering doesn't
// extend beyond the boundaries of the atlased sub-rect
const SkRect bound = SkRect::Make(layer->rect());
atlasCanvas->clipRect(bound);
atlasCanvas->clear(0);
// '-offset' 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(-offset.fX), SkIntToScalar(-offset.fY));
initialCTM.preTranslate(bound.fLeft, bound.fTop);
initialCTM.preConcat(atlased[i].fPreMat);
atlasCanvas->setMatrix(initialCTM);
atlasCanvas->concat(atlased[i].fLocalMat);
SkRecordPartialDraw(*pict->fRecord.get(), atlasCanvas,
pict->drawablePicts(), pict->drawableCount(),
layer->start() + 1, layer->stop(), initialCTM);
atlasCanvas->restore();
}
atlasCanvas->flush();
}
}
SkBitmap wrap_texture(GrTexture* texture) {
SkASSERT(texture);
SkBitmap result;
result.setInfo(texture->surfacePriv().info());
result.setPixelRef(SkNEW_ARGS(SkGrPixelRef, (result.info(), texture)))->unref();
return result;
}
void GrLayerHoister::FilterLayer(GrContext* context,
SkGpuDevice* device,
const GrHoistedLayer& info) {
GrCachedLayer* layer = info.fLayer;
SkASSERT(layer->filter());
static const int kDefaultCacheSize = 32 * 1024 * 1024;
SkBitmap filteredBitmap;
SkIPoint offset = SkIPoint::Make(0, 0);
const SkIPoint filterOffset = SkIPoint::Make(layer->srcIR().fLeft, layer->srcIR().fTop);
SkMatrix totMat = SkMatrix::I();
totMat.preConcat(info.fPreMat);
totMat.preConcat(info.fLocalMat);
totMat.postTranslate(-SkIntToScalar(filterOffset.fX), -SkIntToScalar(filterOffset.fY));
SkASSERT(0 == layer->rect().fLeft && 0 == layer->rect().fTop);
SkIRect clipBounds = layer->rect();
// This cache is transient, and is freed (along with all its contained
// textures) when it goes out of scope.
SkAutoTUnref<SkImageFilter::Cache> cache(SkImageFilter::Cache::Create(kDefaultCacheSize));
SkImageFilter::Context filterContext(totMat, clipBounds, cache);
SkDeviceImageFilterProxy proxy(device, SkSurfaceProps(0, kUnknown_SkPixelGeometry));
const SkBitmap src = wrap_texture(layer->texture());
if (!layer->filter()->filterImage(&proxy, src, filterContext, &filteredBitmap, &offset)) {
// Filtering failed. Press on with the unfiltered version.
return;
}
SkIRect newRect = SkIRect::MakeWH(filteredBitmap.width(), filteredBitmap.height());
layer->setTexture(filteredBitmap.getTexture(), newRect);
layer->setOffset(offset);
}
void GrLayerHoister::DrawLayers(GrContext* context, const SkTDArray<GrHoistedLayer>& layers) {
for (int i = 0; i < layers.count(); ++i) {
GrCachedLayer* layer = layers[i].fLayer;
const SkPicture* pict = layers[i].fPicture;
const SkIPoint offset = SkIPoint::Make(layer->srcIR().fLeft, layer->srcIR().fTop);
// Each non-atlased layer has its own GrTexture
SkSurfaceProps props(0, kUnknown_SkPixelGeometry);
SkAutoTUnref<SkSurface> surface(SkSurface::NewRenderTargetDirect(
layer->texture()->asRenderTarget(), &props));
SkCanvas* layerCanvas = surface->getCanvas();
SkASSERT(0 == layer->rect().fLeft && 0 == layer->rect().fTop);
// Add a rect clip to make sure the rendering doesn't
// extend beyond the boundaries of the layer
const SkRect bound = SkRect::Make(layer->rect());
layerCanvas->clipRect(bound);
layerCanvas->clear(SK_ColorTRANSPARENT);
SkMatrix initialCTM;
initialCTM.setTranslate(SkIntToScalar(-offset.fX), SkIntToScalar(-offset.fY));
initialCTM.preConcat(layers[i].fPreMat);
layerCanvas->setMatrix(initialCTM);
layerCanvas->concat(layers[i].fLocalMat);
SkRecordPartialDraw(*pict->fRecord.get(), layerCanvas,
pict->drawablePicts(), pict->drawableCount(),
layer->start()+1, layer->stop(), initialCTM);
layerCanvas->flush();
if (layer->filter()) {
SkSurface_Gpu* gpuSurf = static_cast<SkSurface_Gpu*>(surface.get());
FilterLayer(context, gpuSurf->getDevice(), layers[i]);
}
}
}
void GrLayerHoister::UnlockLayers(GrContext* context,
const SkTDArray<GrHoistedLayer>& layers) {
GrLayerCache* layerCache = context->getLayerCache();
for (int i = 0; i < layers.count(); ++i) {
layerCache->removeUse(layers[i].fLayer);
}
SkDEBUGCODE(layerCache->validate();)
}
void GrLayerHoister::PurgeCache(GrContext* context) {
#if !GR_CACHE_HOISTED_LAYERS
GrLayerCache* layerCache = context->getLayerCache();
// 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
}