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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 "GrBackendTextureImageGenerator.h"
#include "GrContext.h"
#include "GrContextPriv.h"
#include "GrGpu.h"
#include "GrResourceCache.h"
#include "GrResourceProvider.h"
#include "GrSemaphore.h"
#include "GrTexture.h"
#include "SkGr.h"
#include "SkMessageBus.h"
GrBackendTextureImageGenerator::RefHelper::~RefHelper() {
SkASSERT(nullptr == fBorrowedTexture);
SkASSERT(SK_InvalidGenID == fBorrowingContextID);
// 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.
GrGpuResourceFreedMessage msg { fOriginalTexture, fOwningContextID };
SkMessageBus<GrGpuResourceFreedMessage>::Post(msg);
}
// TODO: I copied this from SkImage_Gpu, perhaps we put a version of this somewhere else?
static GrBackendTexture make_backend_texture_from_handle(GrBackend backend,
int width, int height,
GrPixelConfig config,
GrBackendObject handle) {
#if SK_VULKAN
if (kVulkan_GrBackend == backend) {
GrVkImageInfo* vkInfo = (GrVkImageInfo*)(handle);
return GrBackendTexture(width, height, *vkInfo);
}
#endif
SkASSERT(kOpenGL_GrBackend == backend);
GrGLTextureInfo* glInfo = (GrGLTextureInfo*)(handle);
return GrBackendTexture(width, height, config, *glInfo);
}
std::unique_ptr<SkImageGenerator>
GrBackendTextureImageGenerator::Make(sk_sp<GrTexture> texture, sk_sp<GrSemaphore> semaphore,
SkAlphaType alphaType, sk_sp<SkColorSpace> colorSpace) {
if (colorSpace && (!colorSpace->gammaCloseToSRGB() && !colorSpace->gammaIsLinear())) {
return nullptr;
}
SkColorType colorType = kUnknown_SkColorType;
if (!GrPixelConfigToColorType(texture->config(), &colorType)) {
return nullptr;
}
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.
context->getResourceCache()->insertCrossContextGpuResource(texture.get());
GrBackend backend = context->contextPriv().getBackend();
GrBackendTexture backendTexture = make_backend_texture_from_handle(backend,
texture->width(),
texture->height(),
texture->config(),
texture->getTextureHandle());
SkImageInfo info = SkImageInfo::Make(texture->width(), texture->height(), colorType, alphaType,
std::move(colorSpace));
return std::unique_ptr<SkImageGenerator>(new GrBackendTextureImageGenerator(
info, texture.get(), context->uniqueID(), std::move(semaphore), backendTexture));
}
GrBackendTextureImageGenerator::GrBackendTextureImageGenerator(const SkImageInfo& info,
GrTexture* texture,
uint32_t owningContextID,
sk_sp<GrSemaphore> semaphore,
const GrBackendTexture& backendTex)
: INHERITED(info)
, fRefHelper(new RefHelper(texture, owningContextID))
, fSemaphore(std::move(semaphore))
, fLastBorrowingContextID(SK_InvalidGenID)
, fBackendTexture(backendTex)
, fSurfaceOrigin(texture->origin()) { }
GrBackendTextureImageGenerator::~GrBackendTextureImageGenerator() {
fRefHelper->unref();
}
///////////////////////////////////////////////////////////////////////////////////////////////////
#if SK_SUPPORT_GPU
void GrBackendTextureImageGenerator::ReleaseRefHelper_TextureReleaseProc(void* ctx) {
RefHelper* refHelper = static_cast<RefHelper*>(ctx);
SkASSERT(refHelper);
// Release texture so another context can use it
refHelper->fBorrowedTexture = nullptr;
refHelper->fBorrowingContextID = SK_InvalidGenID;
refHelper->unref();
}
sk_sp<GrTextureProxy> GrBackendTextureImageGenerator::onGenerateTexture(
GrContext* context, const SkImageInfo& info, const SkIPoint& origin) {
SkASSERT(context);
if (context->contextPriv().getBackend() != fBackendTexture.backend()) {
return nullptr;
}
sk_sp<GrTexture> tex;
if (fRefHelper->fBorrowingContextID == context->uniqueID()) {
// 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.
tex = sk_ref_sp(fRefHelper->fBorrowedTexture);
SkASSERT(tex);
} else {
// The texture is available or borrwed by another context. Try for exclusive access.
uint32_t expectedID = SK_InvalidGenID;
if (!fRefHelper->fBorrowingContextID.compare_exchange(&expectedID, context->uniqueID())) {
// Some other context is currently borrowing the texture. We aren't allowed to use it.
return nullptr;
} else {
// Wait on a semaphore when a new context has just started borrowing the texture. This
// is conservative, but shouldn't be too expensive.
if (fSemaphore && fLastBorrowingContextID != context->uniqueID()) {
context->getGpu()->waitSemaphore(fSemaphore);
fLastBorrowingContextID = context->uniqueID();
}
}
// 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.
tex = context->resourceProvider()->wrapBackendTexture(fBackendTexture, fSurfaceOrigin,
kNone_GrBackendTextureFlag, 0,
kBorrow_GrWrapOwnership);
if (!tex) {
fRefHelper->fBorrowingContextID = SK_InvalidGenID;
return nullptr;
}
fRefHelper->fBorrowedTexture = tex.get();
tex->setRelease(ReleaseRefHelper_TextureReleaseProc, fRefHelper);
fRefHelper->ref();
}
SkASSERT(fRefHelper->fBorrowingContextID == context->uniqueID());
sk_sp<GrTextureProxy> proxy = GrSurfaceProxy::MakeWrapped(std::move(tex));
if (0 == origin.fX && 0 == origin.fY &&
info.width() == fBackendTexture.width() && info.height() == fBackendTexture.height()) {
// If the caller wants the entire texture, 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.
GrSurfaceDesc desc;
desc.fConfig = proxy->config();
desc.fWidth = info.width();
desc.fHeight = info.height();
desc.fOrigin = proxy->origin();
desc.fIsMipMapped = proxy->isMipMapped();
desc.fFlags = kRenderTarget_GrSurfaceFlag;
sk_sp<GrSurfaceContext> sContext(context->contextPriv().makeDeferredSurfaceContext(
desc, SkBackingFit::kExact, SkBudgeted::kYes));
if (!sContext) {
return nullptr;
}
SkIRect subset = SkIRect::MakeXYWH(origin.fX, origin.fY, info.width(), info.height());
if (!sContext->copy(proxy.get(), subset, SkIPoint::Make(0, 0))) {
return nullptr;
}
return sContext->asTextureProxyRef();
}
}
#endif
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