Add "lazy" texture proxies

Adds ultra-deferred proxies that are instantiated by a user-supplied
callback during flush.

Bug: skia:7190
Change-Id: I75a7ac6dba953c3b0a99febc203a7f4d2f3789fc
Reviewed-on: https://skia-review.googlesource.com/76461
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>

1 files changed, 31 insertions, 9 deletions

diff --git a/src/gpu/GrTextureRenderTargetProxy.cpp b/src/gpu/GrTextureRenderTargetProxy.cpp
index dd79bfefff..943523116d 100644
--- a/src/gpu/GrTextureRenderTargetProxy.cpp
+++ b/src/gpu/GrTextureRenderTargetProxy.cpp
@@ -7,6 +7,10 @@
 
 #include "GrTextureRenderTargetProxy.h"
 
+#include "GrTexture.h"
+#include "GrRenderTarget.h"
+#include "GrSurfaceProxyPriv.h"
+
 // Deferred version
 // This class is virtually derived from GrSurfaceProxy (via both GrTextureProxy and
 // GrRenderTargetProxy) so its constructor must be explicitly called.
@@ -15,10 +19,20 @@ GrTextureRenderTargetProxy::GrTextureRenderTargetProxy(const GrCaps& caps,
                                                        SkBackingFit fit,
                                                        SkBudgeted budgeted,
                                                        uint32_t flags)
-    : GrSurfaceProxy(desc, fit, budgeted, flags)
-    // for now textures w/ data are always wrapped
-    , GrTextureProxy(desc, fit, budgeted, nullptr, 0, flags)
-    , GrRenderTargetProxy(caps, desc, fit, budgeted, flags) {
+        : GrSurfaceProxy(desc, fit, budgeted, flags)
+        // for now textures w/ data are always wrapped
+        , GrTextureProxy(desc, fit, budgeted, nullptr, 0, flags)
+        , GrRenderTargetProxy(caps, desc, fit, budgeted, flags) {
+}
+
+// Lazy-callback version
+GrTextureRenderTargetProxy::GrTextureRenderTargetProxy(LazyInstantiateCallback&& callback,
+                                                       GrPixelConfig config)
+        : GrSurfaceProxy(std::move(callback), config)
+        // Since we have virtual inheritance, we initialize GrSurfaceProxy directly. Send null
+        // callbacks to the texture and RT proxies simply to route to the appropriate constructors.
+        , GrTextureProxy(LazyInstantiateCallback(), config)
+        , GrRenderTargetProxy(LazyInstantiateCallback(), config) {
 }
 
 // Wrapped version
@@ -26,9 +40,9 @@ GrTextureRenderTargetProxy::GrTextureRenderTargetProxy(const GrCaps& caps,
 // GrRenderTargetProxy) so its constructor must be explicitly called.
 GrTextureRenderTargetProxy::GrTextureRenderTargetProxy(sk_sp<GrSurface> surf,
                                                        GrSurfaceOrigin origin)
-    : GrSurfaceProxy(surf, origin, SkBackingFit::kExact)
-    , GrTextureProxy(surf, origin)
-    , GrRenderTargetProxy(surf, origin) {
+        : GrSurfaceProxy(surf, origin, SkBackingFit::kExact)
+        , GrTextureProxy(surf, origin)
+        , GrRenderTargetProxy(surf, origin) {
     SkASSERT(surf->asTexture());
     SkASSERT(surf->asRenderTarget());
 }
@@ -37,8 +51,8 @@ size_t GrTextureRenderTargetProxy::onUninstantiatedGpuMemorySize() const {
     int colorSamplesPerPixel = this->numColorSamples() + 1;
 
     // TODO: do we have enough information to improve this worst case estimate?
-    return GrSurface::ComputeSize(fConfig, fWidth, fHeight, colorSamplesPerPixel, this->mipMapped(),
-                                  SkBackingFit::kApprox == fFit);
+    return GrSurface::ComputeSize(this->config(), this->width(), this->height(),
+                                  colorSamplesPerPixel, this->mipMapped(), !this->priv().isExact());
 }
 
 bool GrTextureRenderTargetProxy::instantiate(GrResourceProvider* resourceProvider) {
@@ -77,3 +91,11 @@ sk_sp<GrSurface> GrTextureRenderTargetProxy::createSurface(
     return surface;
 }
 
+#ifdef SK_DEBUG
+void GrTextureRenderTargetProxy::validateLazyTexture(const GrTexture* texture) {
+    SkASSERT(texture->asRenderTarget());
+    SkASSERT(texture->asRenderTarget()->numStencilSamples() == this->numStencilSamples());
+    SkASSERT(GrMipMapped::kNo == this->mipMapped());
+}
+#endif
+