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* Copyright 2018 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#ifndef PromiseImageHelper_DEFINED
#define PromiseImageHelper_DEFINED
#include "GrBackendSurface.h"
#include "SkBitmap.h"
#include "SkCachedData.h"
#include "SkDeferredDisplayListRecorder.h"
#include "SkPromiseImageTexture.h"
#include "SkTArray.h"
#include "SkTLazy.h"
#include "SkYUVAIndex.h"
#include "SkYUVASizeInfo.h"
class GrContext;
class SkImage;
class SkPicture;
struct SkYUVAIndex;
// This class consolidates tracking & extraction of the original image data from an skp,
// the upload of said data to the GPU and the fulfillment of promise images.
// The way this works is:
// the original skp is converted to SkData and all its image info is extracted into this
// class and only indices into this class are left in the SkData (via deflateSKP)
// Prior to replaying in threads, all the images stored in this class are uploaded to the
// gpu and PromiseImageCallbackContexts are created for them (via uploadAllToGPU)
// Each thread reinflates the SkData into an SkPicture replacing all the indices w/
// promise images (all using the same GrBackendTexture and getting a ref to the
// appropriate PromiseImageCallbackContext) (via reinflateSKP).
// This class is then reset - dropping all of its refs on the PromiseImageCallbackContexts
// Each done callback unrefs its PromiseImageCallbackContext so, once all the promise images
// are done, the PromiseImageCallbackContext is freed and its GrBackendTexture removed
// from VRAM
// Note: if DDLs are going to be replayed multiple times, the reset call can be delayed until
// all the replaying is complete. This will pin the GrBackendTextures in VRAM.
class DDLPromiseImageHelper {
DDLPromiseImageHelper() = default;
~DDLPromiseImageHelper() = default;
// Convert the SkPicture into SkData replacing all the SkImages with an index.
sk_sp<SkData> deflateSKP(const SkPicture* inputPicture);
void uploadAllToGPU(GrContext* context);
// reinflate a deflated SKP, replacing all the indices with promise images.
sk_sp<SkPicture> reinflateSKP(SkDeferredDisplayListRecorder*,
SkData* compressedPicture,
SkTArray<sk_sp<SkImage>>* promiseImages) const;
// Remove this class' refs on the PromiseImageCallbackContexts
void reset() { fImageInfo.reset(); }
// This class acts as a proxy for a GrBackendTexture that is part of an image.
// Whenever a promise image is created for the image, the promise image receives a ref to
// potentially several of these objects. Once all the promise images receive their done
// callbacks this object is deleted - removing the GrBackendTexture from VRAM.
// Note that while the DDLs are being created in the threads, the PromiseImageHelper holds
// a ref on all the PromiseImageCallbackContexts. However, once all the threads are done
// it drops all of its refs (via "reset").
class PromiseImageCallbackContext : public SkRefCnt {
PromiseImageCallbackContext(GrContext* context) : fContext(context) {}
void setBackendTexture(const GrBackendTexture& backendTexture);
sk_sp<SkPromiseImageTexture> fulfill() {
SkASSERT(fUnreleasedFulfills >= 0);
return fPromiseImageTexture;
void release() {
SkASSERT(fUnreleasedFulfills > 0);
void done() {
SkASSERT(fDoneCnt <= fNumImages);
void wasAddedToImage() { fNumImages++; }
const SkPromiseImageTexture* promiseImageTexture() const {
return fPromiseImageTexture.get();
GrContext* fContext;
sk_sp<SkPromiseImageTexture> fPromiseImageTexture;
int fNumImages = 0;
int fTotalFulfills = 0;
int fTotalReleases = 0;
int fUnreleasedFulfills = 0;
int fDoneCnt = 0;
typedef SkRefCnt INHERITED;
// This is the information extracted into this class from the parsing of the skp file.
// Once it has all been uploaded to the GPU and distributed to the promise images, it
// is all dropped via "reset".
class PromiseImageInfo {
PromiseImageInfo(int index, uint32_t originalUniqueID, const SkImageInfo& ii)
: fIndex(index)
, fOriginalUniqueID(originalUniqueID)
, fImageInfo(ii) {
~PromiseImageInfo() {}
int index() const { return fIndex; }
uint32_t originalUniqueID() const { return fOriginalUniqueID; }
bool isYUV() const { return SkToBool(fYUVData.get()); }
int overallWidth() const { return fImageInfo.width(); }
int overallHeight() const { return fImageInfo.height(); }
SkColorType overallColorType() const { return fImageInfo.colorType(); }
SkAlphaType overallAlphaType() const { return fImageInfo.alphaType(); }
sk_sp<SkColorSpace> refOverallColorSpace() const { return fImageInfo.refColorSpace(); }
SkYUVColorSpace yuvColorSpace() const {
return fYUVColorSpace;
const SkYUVAIndex* yuvaIndices() const {
return fYUVAIndices;
const SkPixmap& yuvPixmap(int index) const {
SkASSERT(index >= 0 && index < SkYUVASizeInfo::kMaxCount);
return fYUVPlanes[index];
const SkBitmap& normalBitmap() const {
return fBitmap;
void setCallbackContext(int index, sk_sp<PromiseImageCallbackContext> callbackContext) {
SkASSERT(index >= 0 && index < (this->isYUV() ? SkYUVASizeInfo::kMaxCount : 1));
fCallbackContexts[index] = callbackContext;
PromiseImageCallbackContext* callbackContext(int index) const {
SkASSERT(index >= 0 && index < (this->isYUV() ? SkYUVASizeInfo::kMaxCount : 1));
return fCallbackContexts[index].get();
sk_sp<PromiseImageCallbackContext> refCallbackContext(int index) const {
SkASSERT(index >= 0 && index < (this->isYUV() ? SkYUVASizeInfo::kMaxCount : 1));
return fCallbackContexts[index];
const SkPromiseImageTexture* promiseTexture(int index) const {
SkASSERT(index >= 0 && index < (this->isYUV() ? SkYUVASizeInfo::kMaxCount : 1));
return fCallbackContexts[index]->promiseImageTexture();
void setNormalBitmap(const SkBitmap& bm) { fBitmap = bm; }
void setYUVData(sk_sp<SkCachedData> yuvData,
SkYUVAIndex yuvaIndices[SkYUVAIndex::kIndexCount],
SkYUVColorSpace cs) {
fYUVData = yuvData;
memcpy(fYUVAIndices, yuvaIndices, sizeof(fYUVAIndices));
fYUVColorSpace = cs;
void addYUVPlane(int index, const SkImageInfo& ii, const void* plane, size_t widthBytes) {
SkASSERT(index >= 0 && index < SkYUVASizeInfo::kMaxCount);
fYUVPlanes[index].reset(ii, plane, widthBytes);
const int fIndex; // index in the 'fImageInfo' array
const uint32_t fOriginalUniqueID; // original ID for deduping
const SkImageInfo fImageInfo; // info for the overarching image
// CPU-side cache of a normal SkImage's contents
SkBitmap fBitmap;
// CPU-side cache of a YUV SkImage's contents
sk_sp<SkCachedData> fYUVData; // when !null, this is a YUV image
SkYUVColorSpace fYUVColorSpace = kJPEG_SkYUVColorSpace;
SkYUVAIndex fYUVAIndices[SkYUVAIndex::kIndexCount];
SkPixmap fYUVPlanes[SkYUVASizeInfo::kMaxCount];
// Up to SkYUVASizeInfo::kMaxCount for a YUVA image. Only one for a normal image.
sk_sp<PromiseImageCallbackContext> fCallbackContexts[SkYUVASizeInfo::kMaxCount];
// This stack-based context allows each thread to re-inflate the image indices into
// promise images while still using the same GrBackendTexture.
struct PerRecorderContext {
SkDeferredDisplayListRecorder* fRecorder;
const DDLPromiseImageHelper* fHelper;
SkTArray<sk_sp<SkImage>>* fPromiseImages;
static sk_sp<SkPromiseImageTexture> PromiseImageFulfillProc(void* textureContext) {
auto callbackContext = static_cast<PromiseImageCallbackContext*>(textureContext);
return callbackContext->fulfill();
static void PromiseImageReleaseProc(void* textureContext) {
auto callbackContext = static_cast<PromiseImageCallbackContext*>(textureContext);
static void PromiseImageDoneProc(void* textureContext) {
auto callbackContext = static_cast<PromiseImageCallbackContext*>(textureContext);
static sk_sp<SkImage> PromiseImageCreator(const void* rawData, size_t length, void* ctxIn);
bool isValidID(int id) const { return id >= 0 && id < fImageInfo.count(); }
const PromiseImageInfo& getInfo(int id) const { return fImageInfo[id]; }
void uploadImage(GrContext*, PromiseImageInfo*);
// returns -1 if not found
int findImage(SkImage* image) const;
// returns -1 on failure
int addImage(SkImage* image);
// returns -1 on failure
int findOrDefineImage(SkImage* image);
SkTArray<PromiseImageInfo> fImageInfo;