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* Copyright 2017 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#include "include/gpu/GrContext.h"
#include "include/gpu/GrTexture.h"
#include "include/private/GrRecordingContext.h"
#include "src/core/SkMessageBus.h"
#include "src/gpu/GrBackendTextureImageGenerator.h"
#include "src/gpu/GrContextPriv.h"
#include "src/gpu/GrGpu.h"
#include "src/gpu/GrProxyProvider.h"
#include "src/gpu/GrRecordingContextPriv.h"
#include "src/gpu/GrRenderTargetContext.h"
#include "src/gpu/GrResourceCache.h"
#include "src/gpu/GrResourceProvider.h"
#include "src/gpu/GrResourceProviderPriv.h"
#include "src/gpu/GrSemaphore.h"
#include "src/gpu/GrTexturePriv.h"
#include "src/gpu/GrTextureProxyPriv.h"
#include "src/gpu/SkGr.h"
#include "src/gpu/gl/GrGLTexture.h"
GrBackendTextureImageGenerator::RefHelper::RefHelper(GrTexture* texture, uint32_t owningContextID)
: fOriginalTexture(texture)
, fOwningContextID(owningContextID)
, fBorrowingContextReleaseProc(nullptr)
, fBorrowingContextID(SK_InvalidGenID) {}
GrBackendTextureImageGenerator::RefHelper::~RefHelper() {
SkASSERT(fBorrowingContextID == SK_InvalidUniqueID);
// Generator has been freed, and no one is borrowing the texture. Notify the original cache
// that it can free the last ref, so it happens on the correct thread.
GrTextureFreedMessage msg { fOriginalTexture, fOwningContextID };
GrBackendTextureImageGenerator::Make(sk_sp<GrTexture> texture, GrSurfaceOrigin origin,
sk_sp<GrSemaphore> semaphore, SkColorType colorType,
SkAlphaType alphaType, sk_sp<SkColorSpace> colorSpace) {
GrContext* context = texture->getContext();
// Attach our texture to this context's resource cache. This ensures that deletion will happen
// in the correct thread/context. This adds the only ref to the texture that will persist from
// this point. That ref will be released when the generator's RefHelper is freed.
GrBackendTexture backendTexture = texture->getBackendTexture();
if (!context->priv().caps()->areColorTypeAndFormatCompatible(
SkColorTypeToGrColorType(colorType), backendTexture.getBackendFormat())) {
return nullptr;
SkImageInfo info = SkImageInfo::Make(texture->width(), texture->height(), colorType, alphaType,
return std::unique_ptr<SkImageGenerator>(new GrBackendTextureImageGenerator(
info, texture.get(), origin, context->priv().contextID(),
std::move(semaphore), backendTexture));
GrBackendTextureImageGenerator::GrBackendTextureImageGenerator(const SkImageInfo& info,
GrTexture* texture,
GrSurfaceOrigin origin,
uint32_t owningContextID,
sk_sp<GrSemaphore> semaphore,
const GrBackendTexture& backendTex)
, fRefHelper(new RefHelper(texture, owningContextID))
, fSemaphore(std::move(semaphore))
, fBackendTexture(backendTex)
, fSurfaceOrigin(origin) {}
GrBackendTextureImageGenerator::~GrBackendTextureImageGenerator() {
void GrBackendTextureImageGenerator::ReleaseRefHelper_TextureReleaseProc(void* ctx) {
RefHelper* refHelper = static_cast<RefHelper*>(ctx);
refHelper->fBorrowingContextReleaseProc = nullptr;
refHelper->fBorrowingContextID = SK_InvalidGenID;
sk_sp<GrTextureProxy> GrBackendTextureImageGenerator::onGenerateTexture(
GrRecordingContext* context, const SkImageInfo& info,
const SkIPoint& origin, bool willNeedMipMaps) {
if (context->backend() != fBackendTexture.backend()) {
return nullptr;
if (info.colorType() != this->getInfo().colorType()) {
return nullptr;
auto proxyProvider = context->priv().proxyProvider();
const GrCaps* caps = context->priv().caps();
sk_sp<GrRefCntedCallback> releaseProcHelper;
if (SK_InvalidGenID != fRefHelper->fBorrowingContextID) {
if (fRefHelper->fBorrowingContextID != context->priv().contextID()) {
return nullptr;
} else {
// Ref the release proc to be held by the proxy we make below
releaseProcHelper = sk_ref_sp(fRefHelper->fBorrowingContextReleaseProc);
} else {
// The ref we add to fRefHelper here will be passed into and owned by the
// GrRefCntedCallback.
new GrRefCntedCallback(ReleaseRefHelper_TextureReleaseProc, fRefHelper));
fRefHelper->fBorrowingContextReleaseProc = releaseProcHelper.get();
fRefHelper->fBorrowingContextID = context->priv().contextID();
if (!fRefHelper->fBorrowedTextureKey.isValid()) {
static const auto kDomain = GrUniqueKey::GenerateDomain();
GrUniqueKey::Builder builder(&fRefHelper->fBorrowedTextureKey, kDomain, 1);
builder[0] = this->uniqueID();
SkASSERT(fRefHelper->fBorrowingContextID == context->priv().contextID());
GrBackendFormat backendFormat = fBackendTexture.getBackendFormat();
GrColorType grColorType = SkColorTypeToGrColorType(info.colorType());
GrPixelConfig config = caps->getConfigFromBackendFormat(backendFormat, grColorType);
if (kUnknown_GrPixelConfig == config) {
return nullptr;
GrSurfaceDesc desc;
desc.fWidth = fBackendTexture.width();
desc.fHeight = fBackendTexture.height();
desc.fConfig = config;
GrMipMapped mipMapped = fBackendTexture.hasMipMaps() ? GrMipMapped::kYes : GrMipMapped::kNo;
// Ganesh assumes that, when wrapping a mipmapped backend texture from a client, that its
// mipmaps are fully fleshed out.
GrMipMapsStatus mipMapsStatus = fBackendTexture.hasMipMaps()
? GrMipMapsStatus::kValid : GrMipMapsStatus::kNotAllocated;
// Must make copies of member variables to capture in the lambda since this image generator may
// be deleted before we actually execute the lambda.
sk_sp<GrTextureProxy> proxy = proxyProvider->createLazyProxy(
[refHelper = fRefHelper, releaseProcHelper, semaphore = fSemaphore,
backendTexture = fBackendTexture, grColorType](
GrResourceProvider* resourceProvider) -> GrSurfaceProxy::LazyCallbackResult {
if (semaphore) {
// If a client re-draws the same image multiple times, the texture we return
// will be cached and re-used. If they draw a subset, though, we may be
// re-called. In that case, we want to re-use the borrowed texture we've
// previously created.
sk_sp<GrTexture> tex;
auto surf = resourceProvider->findByUniqueKey<GrSurface>(
if (surf) {
tex = sk_ref_sp(surf->asTexture());
} else {
// We just gained access to the texture. If we're on the original context, we
// could use the original texture, but we'd have no way of detecting that it's
// no longer in-use. So we always make a wrapped copy, where the release proc
// informs us that the context is done with it. This is unfortunate - we'll have
// two texture objects referencing the same GPU object. However, no client can
// ever see the original texture, so this should be safe.
// We make the texture uncacheable so that the release proc is called ASAP.
tex = resourceProvider->wrapBackendTexture(
backendTexture, grColorType, kBorrow_GrWrapOwnership,
GrWrapCacheable::kNo, kRead_GrIOType);
if (!tex) {
return {};
// We use keys to avoid re-wrapping the GrBackendTexture in a GrTexture. This is
// unrelated to the whatever SkImage key may be assigned to the proxy.
return {std::move(tex), true, GrSurfaceProxy::LazyInstantiationKeyMode::kUnsynced};
backendFormat, desc, GrRenderable::kNo, 1, fSurfaceOrigin, mipMapped, mipMapsStatus,
GrInternalSurfaceFlags::kReadOnly, SkBackingFit::kExact, SkBudgeted::kNo,
GrProtected::kNo, GrSurfaceProxy::UseAllocator::kYes);
if (!proxy) {
return nullptr;
if (0 == origin.fX && 0 == origin.fY &&
info.width() == fBackendTexture.width() && info.height() == fBackendTexture.height() &&
(!willNeedMipMaps || GrMipMapped::kYes == proxy->mipMapped())) {
// If the caller wants the entire texture and we have the correct mip support, we're done
return proxy;
} else {
// Otherwise, make a copy of the requested subset. Make sure our temporary is renderable,
// because Vulkan will want to do the copy as a draw. All other copies would require a
// layout change in Vulkan and we do not change the layout of borrowed images.
GrMipMapped mipMapped = willNeedMipMaps ? GrMipMapped::kYes : GrMipMapped::kNo;
SkIRect subset = SkIRect::MakeXYWH(origin.fX, origin.fY, info.width(), info.height());
return GrSurfaceProxy::Copy(context, proxy.get(), grColorType, mipMapped, subset,
SkBackingFit::kExact, SkBudgeted::kYes);