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* Copyright 2016 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#ifndef SkUrlDataManager_DEFINED
#define SkUrlDataManager_DEFINED
#include "include/core/SkData.h"
#include "include/core/SkImage.h"
#include "include/core/SkString.h"
#include "src/core/SkOpts.h"
#include "src/core/SkTDynamicHash.h"
#include <unordered_map>
* A simple class which allows clients to add opaque data types, and returns a url where this data
* will be hosted. Its up to the owner of this class to actually serve the data.
bool operator==(const SkData& a, const SkData& b);
class UrlDataManager {
UrlDataManager(SkString rootUrl);
~UrlDataManager() { this->reset(); }
* Adds a data blob to the cache with a particular content type. UrlDataManager will hash
* the blob data to ensure uniqueness
SkString addData(SkData*, const char* contentType);
struct UrlData : public SkRefCnt {
SkString fUrl;
SkString fContentType;
sk_sp<SkData> fData;
* returns the UrlData object which should be hosted at 'url'
UrlData* getDataFromUrl(SkString url) {
return fUrlLookup.find(url);
void reset();
// Methods used to identify images differently in wasm debugger for mskp animations.
// serving is uncessary, as a collection of images with identifiers is already present, we
// just want to use it when serializing commands.
* Construct an index from a list of images
* (expected to be the list that was loaded from the mskp file)
* Use only once.
void indexImages(const std::vector<sk_sp<SkImage>>&);
* Reports whether this UDM has an initialized image index (effevitely whether we're in wasm)
bool hasImageIndex() { return imageMap.size() > 0; }
* Return the file id (index of the image in the originally provided list) of an SkImage
int lookupImage(const SkImage*);
struct LookupTrait {
// We use the data as a hash, this is not really optimal but is fine until proven otherwise
static const SkData& GetKey(const UrlData& data) {
return *data.fData.get();
static uint32_t Hash(const SkData& key) {
return SkOpts::hash(key.bytes(), key.size());
struct ReverseLookupTrait {
static const SkString& GetKey(const UrlData& data) {
return data.fUrl;
static uint32_t Hash(const SkString& key) {
return SkOpts::hash(key.c_str(), strlen(key.c_str()));
SkString fRootUrl;
SkTDynamicHash<UrlData, SkData, LookupTrait> fCache;
SkTDynamicHash<UrlData, SkString, ReverseLookupTrait> fUrlLookup;
uint32_t fDataId;
std::unordered_map<const SkImage*, int> imageMap;