Revert "Revert "Revert "Make threaded proxy generation MDB-friendly, and defer instantiation"""

This reverts commit e8b8397664666bfcba8f088ea073ede915da8a41.

Reason for revert: More crashing.

Original change's description:
> Revert "Revert "Make threaded proxy generation MDB-friendly, and defer instantiation""
> 
> This reverts commit 837c6c7c0cc76bdb9d61a05244ca5f31e7573c37.
> 
> Bug: skia:
> Change-Id: I1821f1b2b772c67f1b749692b398eb757d8073c9
> Reviewed-on: https://skia-review.googlesource.com/52744
> Reviewed-by: Greg Daniel <egdaniel@google.com>
> Commit-Queue: Brian Osman <brianosman@google.com>

TBR=egdaniel@google.com,robertphillips@google.com,brianosman@google.com

Change-Id: I1c8a81ed1000446c298d646d2cd5e7ebd212f18c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/52860
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>

1 files changed, 0 insertions, 108 deletions

diff --git a/src/gpu/GrDeferredProxyUploader.h b/src/gpu/GrDeferredProxyUploader.h
deleted file mode 100644
index 35581166de..0000000000
--- a/src/gpu/GrDeferredProxyUploader.h
+++ /dev/null
@@ -1,108 +0,0 @@
-/*
- * Copyright 2017 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef GrDeferredProxyUploader_DEFINED
-#define GrDeferredProxyUploader_DEFINED
-
-#include "SkAutoPixmapStorage.h"
-#include "SkMakeUnique.h"
-#include "SkRefCnt.h"
-#include "SkSemaphore.h"
-
-#include "GrOpFlushState.h"
-#include "GrTextureProxyPriv.h"
-
-/**
- * GrDeferredProxyUploader assists with threaded generation of textures. Currently used by both
- * software clip masks, and the software path renderer. The calling code typically needs to store
- * some additional data (T) for use on the worker thread. GrTDeferredProxyUploader allows storing
- * such data. The common flow is:
- *
- * 1) A GrTDeferredProxyUploader is created, with some payload (eg an SkPath to draw).
- *    The uploader is owned by the proxy that it's going to populate.
- * 2) A task is created with a pointer to the uploader. A worker thread executes that task, using
- *    the payload data to allocate and fill in the fPixels pixmap.
- * 3) The worker thread calls signalAndFreeData(), which notifies the main thread that the pixmap
- *    is ready, and then deletes the payload data (which is no longer needed).
- * 4) In parallel to 2-3, on the main thread... Some op is created that refers to the proxy. When
- *    that op is added to an op list, the op list retains a pointer to the "deferred" proxies.
- * 5) At flush time, the op list ensures that the deferred proxies are instantiated, then calls
- *    scheduleUpload on those proxies, which calls scheduleUpload on the uploader (below).
- * 6) scheduleUpload defers the upload even further, by adding an ASAPUpload to the flush.
- * 7) When the ASAP upload happens, we wait to make sure that the pixels are marked ready
- *    (from step #3 on the worker thread). Then we perform the actual upload to the texture.
- *    Finally, we call resetDeferredUploader, which deletes the uploader object, causing fPixels
- *    to be freed.
- */
-class GrDeferredProxyUploader : public SkNoncopyable {
-public:
-    GrDeferredProxyUploader() : fScheduledUpload(false), fWaited(false) {}
-
-    virtual ~GrDeferredProxyUploader() {
-        if (!fWaited) {
-            // This can happen if our owning proxy fails to instantiate
-            fPixelsReady.wait();
-        }
-    }
-
-    void scheduleUpload(GrOpFlushState* flushState, GrTextureProxy* proxy) {
-        if (fScheduledUpload) {
-            // Multiple references to the owning proxy may have caused us to already execute
-            return;
-        }
-
-        auto uploadMask = [this, proxy](GrDrawOp::WritePixelsFn& writePixelsFn) {
-            this->fPixelsReady.wait();
-            this->fWaited = true;
-            // If the worker thread was unable to allocate pixels, this check will fail, and we'll
-            // end up drawing with an uninitialized mask texture, but at least we won't crash.
-            if (this->fPixels.addr()) {
-                writePixelsFn(proxy, 0, 0, this->fPixels.width(), this->fPixels.height(),
-                              proxy->config(), this->fPixels.addr(), this->fPixels.rowBytes());
-            }
-            // Upload has finished, so tell the proxy to release this GrDeferredProxyUploader
-            proxy->texPriv().resetDeferredUploader();
-        };
-        flushState->addASAPUpload(std::move(uploadMask));
-        fScheduledUpload = true;
-    }
-
-    void signalAndFreeData() {
-        fPixelsReady.signal();
-        this->freeData();
-    }
-
-    SkAutoPixmapStorage* getPixels() { return &fPixels; }
-
-private:
-    virtual void freeData() {}
-
-    SkAutoPixmapStorage fPixels;
-    SkSemaphore fPixelsReady;
-    bool fScheduledUpload;
-    bool fWaited;
-};
-
-template <typename T>
-class GrTDeferredProxyUploader : public GrDeferredProxyUploader {
-public:
-    template <typename... Args>
-    GrTDeferredProxyUploader(Args&&... args)
-        : fData(skstd::make_unique<T>(std::forward<Args>(args)...)) {
-    }
-
-    T& data() { return *fData; }
-
-private:
-    void freeData() override {
-        fData.reset();
-    }
-
-    std::unique_ptr<T> fData;
-};
-
-#endif