1 /*
2 * Copyright 2019 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "tools/SkSharingProc.h"
9
10 #include "include/core/SkData.h"
11 #include "include/core/SkImage.h"
12 #include "include/core/SkSerialProcs.h"
13
serializeImage(SkImage * img,void * ctx)14 sk_sp<SkData> SkSharingSerialContext::serializeImage(SkImage* img, void* ctx) {
15 SkSharingSerialContext* context = reinterpret_cast<SkSharingSerialContext*>(ctx);
16 uint32_t id = img->uniqueID(); // get this process's id for the image. these are not hashes.
17 // find out if we have already serialized this, and if so, what its in-file id is.
18 auto iter = context->fImageMap.find(id);
19 if (iter == context->fImageMap.end()) {
20 // When not present, add its id to the map and return its usual serialized form.
21 context->fImageMap[id] = context->fImageMap.size();
22 return img->encodeToData();
23 }
24 uint32_t fid = context->fImageMap[id];
25 // if present, return only the in-file id we registered the first time we serialized it.
26 return SkData::MakeWithCopy(&fid, sizeof(fid));
27 }
28
deserializeImage(const void * data,size_t length,void * ctx)29 sk_sp<SkImage> SkSharingDeserialContext::deserializeImage(
30 const void* data, size_t length, void* ctx) {
31 SkSharingDeserialContext* context = reinterpret_cast<SkSharingDeserialContext*>(ctx);
32 uint32_t fid;
33 // If the data is an image fid, look up an already deserialized image from our map
34 if (length == sizeof(fid)) {
35 memcpy(&fid, data, sizeof(fid));
36 if (fid >= context->fImages.size()) {
37 SkDebugf("We do not have the data for image %d.\n", fid);
38 return nullptr;
39 }
40 return context->fImages[fid];
41 }
42 // Otherwise, the data is an image, deserialise it, store it in our map at its fid.
43 // TODO(nifong): make DeserialProcs accept sk_sp<SkData> so we don't have to copy this.
44 sk_sp<SkData> dataView = SkData::MakeWithCopy(data, length);
45 const sk_sp<SkImage> image = SkImage::MakeFromEncoded(std::move(dataView));
46 context->fImages.push_back(image);
47 return image;
48 }
49