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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "CacheManager.h"
#include "Layer.h"
#include "RenderThread.h"
#include "renderstate/RenderState.h"
#include <gui/Surface.h>
#include <GrContextOptions.h>
#include <math.h>
#include <set>
namespace android {
namespace uirenderer {
namespace renderthread {
// This multiplier was selected based on historical review of cache sizes relative
// to the screen resolution. This is meant to be a conservative default based on
// that analysis. The 4.0f is used because the default pixel format is assumed to
// be ARGB_8888.
#define SURFACE_SIZE_MULTIPLIER (12.0f * 4.0f)
#define BACKGROUND_RETENTION_PERCENTAGE (0.5f)
// for super large fonts we will draw them as paths so no need to keep linearly
// increasing the font cache size.
#define FONT_CACHE_MIN_MB (0.5f)
#define FONT_CACHE_MAX_MB (4.0f)
CacheManager::CacheManager(const DisplayInfo& display)
: mMaxSurfaceArea(display.w * display.h) {
mVectorDrawableAtlas = new skiapipeline::VectorDrawableAtlas(mMaxSurfaceArea/2,
skiapipeline::VectorDrawableAtlas::StorageMode::allowSharedSurface);
}
void CacheManager::reset(GrContext* context) {
if (context != mGrContext.get()) {
destroy();
}
if (context) {
mGrContext = sk_ref_sp(context);
mGrContext->getResourceCacheLimits(&mMaxResources, nullptr);
updateContextCacheSizes();
}
}
void CacheManager::destroy() {
// cleanup any caches here as the GrContext is about to go away...
mGrContext.reset(nullptr);
mVectorDrawableAtlas = new skiapipeline::VectorDrawableAtlas(mMaxSurfaceArea/2);
}
void CacheManager::updateContextCacheSizes() {
mMaxResourceBytes = mMaxSurfaceArea * SURFACE_SIZE_MULTIPLIER;
mBackgroundResourceBytes = mMaxResourceBytes * BACKGROUND_RETENTION_PERCENTAGE;
mGrContext->setResourceCacheLimits(mMaxResources, mMaxResourceBytes);
}
void CacheManager::configureContext(GrContextOptions* contextOptions) {
contextOptions->fAllowPathMaskCaching = true;
float screenMP = mMaxSurfaceArea / 1024.0f / 1024.0f;
float fontCacheMB = 0;
float decimalVal = std::modf(screenMP, &fontCacheMB);
// This is a basic heuristic to size the cache to a multiple of 512 KB
if (decimalVal > 0.8f) {
fontCacheMB += 1.0f;
} else if (decimalVal > 0.5f) {
fontCacheMB += 0.5f;
}
// set limits on min/max size of the cache
fontCacheMB = std::max(FONT_CACHE_MIN_MB, std::min(FONT_CACHE_MAX_MB, fontCacheMB));
// We must currently set the size of the text cache based on the size of the
// display even though we like to be dynamicallysizing it to the size of the window.
// Skia's implementation doesn't provide a mechanism to resize the font cache due to
// the potential cost of recreating the glyphs.
contextOptions->fGlyphCacheTextureMaximumBytes = fontCacheMB * 1024 * 1024;
}
void CacheManager::trimMemory(TrimMemoryMode mode) {
if (!mGrContext) {
return;
}
mGrContext->flush();
switch (mode) {
case TrimMemoryMode::Complete:
mVectorDrawableAtlas = new skiapipeline::VectorDrawableAtlas(mMaxSurfaceArea/2);
mGrContext->freeGpuResources();
break;
case TrimMemoryMode::UiHidden:
mGrContext->purgeUnlockedResources(mMaxResourceBytes - mBackgroundResourceBytes, true);
break;
}
}
void CacheManager::trimStaleResources() {
if (!mGrContext) {
return;
}
mGrContext->flush();
mGrContext->purgeResourcesNotUsedInMs(std::chrono::seconds(30));
}
sp<skiapipeline::VectorDrawableAtlas> CacheManager::acquireVectorDrawableAtlas() {
LOG_ALWAYS_FATAL_IF(mVectorDrawableAtlas.get() == nullptr);
LOG_ALWAYS_FATAL_IF(mGrContext == nullptr);
/**
* TODO: define memory conditions where we clear the cache (e.g. surface->reset())
*/
return mVectorDrawableAtlas;
}
void CacheManager::dumpMemoryUsage(String8& log, const RenderState* renderState) {
if (!mGrContext) {
log.appendFormat("No valid cache instance.\n");
return;
}
size_t bytesCached;
mGrContext->getResourceCacheUsage(nullptr, &bytesCached);
log.appendFormat("Caches:\n");
log.appendFormat(" Current / Maximum\n");
log.appendFormat(" VectorDrawableAtlas %6.2f kB / %6.2f kB (entries = %zu)\n",
0.0f, 0.0f, (size_t)0);
if (renderState) {
if (renderState->mActiveLayers.size() > 0) {
log.appendFormat(" Layer Info:\n");
}
size_t layerMemoryTotal = 0;
for (std::set<Layer*>::iterator it = renderState->mActiveLayers.begin();
it != renderState->mActiveLayers.end(); it++) {
const Layer* layer = *it;
const char* layerType = layer->getApi() == Layer::Api::OpenGL ? "GlLayer" : "VkLayer";
log.appendFormat(" %s size %dx%d\n", layerType,
layer->getWidth(), layer->getHeight());
layerMemoryTotal += layer->getWidth() * layer->getHeight() * 4;
}
log.appendFormat(" Layers Total %6.2f kB (numLayers = %zu)\n",
layerMemoryTotal / 1024.0f, renderState->mActiveLayers.size());
}
log.appendFormat("Total memory usage:\n");
log.appendFormat(" %zu bytes, %.2f MB (%.2f MB is purgeable)\n",
bytesCached, bytesCached / 1024.0f / 1024.0f,
mGrContext->getResourceCachePurgeableBytes() / 1024.0f / 1024.0f);
}
} /* namespace renderthread */
} /* namespace uirenderer */
} /* namespace android */
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