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/codec/SkPngDecoder.h"
11 #include "include/core/SkBitmap.h"
12 #include "include/core/SkData.h"
13 #include "include/core/SkImage.h"
14 #include "include/core/SkPicture.h"
15 #include "include/core/SkSerialProcs.h"
16 #include "include/core/SkStream.h"
17 #include "include/encode/SkPngEncoder.h"
18
19 namespace {
collectNonTextureImagesProc(SkImage * img,void * ctx)20 sk_sp<SkData> collectNonTextureImagesProc(SkImage* img, void* ctx) {
21 SkSharingSerialContext* context = reinterpret_cast<SkSharingSerialContext*>(ctx);
22 uint32_t originalId = img->uniqueID();
23 sk_sp<SkImage>* imageInMap = context->fNonTexMap.find(originalId);
24 if (!imageInMap) {
25 context->fNonTexMap[originalId] = img->makeNonTextureImage();
26 }
27
28 // This function implements a proc that is more generally for serialization, but
29 // we really only want to build our map. The output of this function is ignored.
30 return SkData::MakeEmpty();
31 }
32 }
33
34 #ifdef ENABLE_TEXT_ENHANCE
collectNonTextureImagesFromPicture(const SkPicture * pic,SkSharingSerialContext * sharingCtx)35 SK_API void SkSharingSerialContext::collectNonTextureImagesFromPicture(
36 #else
37 void SkSharingSerialContext::collectNonTextureImagesFromPicture(
38 #endif
39 const SkPicture* pic, SkSharingSerialContext* sharingCtx) {
40 SkSerialProcs tempProc;
41 tempProc.fImageCtx = sharingCtx;
42 tempProc.fImageProc = collectNonTextureImagesProc;
43 SkNullWStream ns;
44 pic->serialize(&ns, &tempProc);
45 }
46
47 #ifdef ENABLE_TEXT_ENHANCE
serializeImage(SkImage * img,void * ctx)48 SK_API sk_sp<SkData> SkSharingSerialContext::serializeImage(SkImage* img, void* ctx) {
49 #else
50 sk_sp<SkData> SkSharingSerialContext::serializeImage(SkImage* img, void* ctx) {
51 #endif
52 SkSharingSerialContext* context = reinterpret_cast<SkSharingSerialContext*>(ctx);
53 uint32_t id = img->uniqueID(); // get this process's id for the image. these are not hashes.
54 // find out if we have already serialized this, and if so, what its in-file id is.
55 int* fid = context->fImageMap.find(id);
56 if (!fid) {
57 // When not present, add its id to the map and return its usual serialized form.
58 context->fImageMap[id] = context->fImageMap.count(); // Next in-file id
59 // encode the image or it's non-texture replacement if one was collected
60 sk_sp<SkImage>* replacementImage = context->fNonTexMap.find(id);
61 if (replacementImage) {
62 img = replacementImage->get();
63 }
64 return SkPngEncoder::Encode(nullptr, img, {});
65 }
66 // if present, return only the in-file id we registered the first time we serialized it.
67 return SkData::MakeWithCopy(fid, sizeof(*fid));
68 }
69
70 sk_sp<SkImage> SkSharingDeserialContext::deserializeImage(
71 const void* data, size_t length, void* ctx) {
72 if (!data || !length || !ctx) {
73 SkDebugf("SkSharingDeserialContext::deserializeImage arguments invalid %p %zu %p.\n",
74 data, length, ctx);
75 // Return something so the rest of the debugger can proceed.
76 SkBitmap bm;
77 bm.allocPixels(SkImageInfo::MakeN32Premul(1, 1));
78 return bm.asImage();
79 }
80 SkSharingDeserialContext* context = reinterpret_cast<SkSharingDeserialContext*>(ctx);
81 uint32_t fid;
82 // If the data is an image fid, look up an already deserialized image from our map
83 if (length == sizeof(fid)) {
84 memcpy(&fid, data, sizeof(fid));
85 if (fid >= context->fImages.size()) {
86 SkDebugf("Cannot deserialize using id, We do not have the data for image %u.\n", fid);
87 return nullptr;
88 }
89 return context->fImages[fid];
90 }
91 // Otherwise, the data is an image, deserialise it, store it in our map at its fid.
92 // TODO(nifong): make DeserialProcs accept sk_sp<SkData> so we don't have to copy this.
93 sk_sp<SkData> dataView = SkData::MakeWithCopy(data, length);
94 auto codec = SkPngDecoder::Decode(std::move(dataView), nullptr);
95 if (!codec) {
96 SkDebugf("Cannot deserialize image - might not be a PNG.\n");
97 return nullptr;
98 }
99 SkImageInfo info = codec->getInfo().makeAlphaType(kPremul_SkAlphaType);
100 auto [image, result] = codec->getImage(info);
101 if (result != SkCodec::Result::kSuccess) {
102 SkDebugf("Error decoding image %d.\n", result);
103 // Might have partially decoded.
104 }
105 context->fImages.push_back(image);
106 return image;
107 }
108