| /* |
| * Copyright 2019 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef SkSharingProc_DEFINED |
| #define SkSharingProc_DEFINED |
| |
| #include <unordered_map> |
| #include <vector> |
| |
| #include "include/core/SkData.h" |
| #include "include/core/SkImage.h" |
| #include "include/core/SkSerialProcs.h" |
| #include "src/core/SkTHash.h" |
| |
| /** |
| * This serial proc serializes each image it encounters only once, using their uniqueId as the |
| * property for sameness. |
| * |
| * It's most basic usage involves setting your imageProc to SkSharingSerialContext::serializeImage |
| * and creating an SkSharingSerialContext in an appropriate scope to outlive all the images that |
| * will be encountered before serialization. |
| * |
| * Optionally, collectNonTextureImagesFromPicture can be called with an SkSharingContext and an |
| * SkPicture that may reference not-yet-released texture backed images. It will make non-texture |
| * copies if necessary and store them in the context. If present, they will be used in the |
| * final serialization. |
| * |
| * This is intended to be used on Android with MultiPictureDocument's onEndPage parameter, in a |
| * lambda that captures the context, because MPD cannot make assumptions about the type of proc it |
| * receives and clients (Chrome) build MPD without this source file. |
| */ |
| |
| struct SkSharingSerialContext { |
| // --- Data and and function for optional texture collection pass --- // |
| |
| // A map from uniqueID of images referenced by commands to non-texture images |
| // collected at the end of each frame. |
| skia_private::THashMap<uint32_t, sk_sp<SkImage>> fNonTexMap; |
| |
| // Collects any non-texture images referenced by the picture and stores non-texture copies |
| // in the fNonTexMap of the provided SkSharingContext |
| static void collectNonTextureImagesFromPicture( |
| const SkPicture* pic, SkSharingSerialContext* sharingCtx); |
| |
| |
| // --- Data and serialization function for regular use --- // |
| |
| // A map from the ids from SkImage::uniqueID() to ids used within the file |
| // The keys are ids of original images, not of non-texture copies |
| skia_private::THashMap<uint32_t, int> fImageMap; |
| |
| // A serial proc that shares images between subpictures |
| // To use this, create an instance of SkSerialProcs and populate it this way. |
| // The client must retain ownership of the context. |
| // auto ctx = std::make_unique<SkSharingSerialContext>() |
| // SkSerialProcs procs; |
| // procs.fImageProc = SkSharingSerialContext::serializeImage; |
| // procs.fImageCtx = ctx.get(); |
| static sk_sp<SkData> serializeImage(SkImage* img, void* ctx); |
| }; |
| |
| struct SkSharingDeserialContext { |
| // a list of unique images in the order they were encountered in the file |
| // Subsequent occurrences of an image refer to it by it's index in this list. |
| std::vector<sk_sp<SkImage>> fImages; |
| |
| // A deserial proc that can interpret id's in place of images as references to previous images. |
| // Can also deserialize a SKP where all images are inlined (it's backwards compatible) |
| static sk_sp<SkImage> deserializeImage(const void* data, size_t length, void* ctx); |
| }; |
| |
| #endif |