Add GrExternalTextureData and SkCrossContextImageData

GrExternalTextureData is an API for exporting the backend-specific
information about a texture in a type-safe way, and without pointing
into the GrTexture. The new detachBackendTexture API lets us release
ownership of a texture to the client.

SkCrossContextImageData is the public API that lets clients upload
textures on one thread/GrContext, then safely transfer ownership to
another thread and GrContext for rendering.

Only GL is implemented/supported right now. Vulkan support requires
that we add thread-safe memory pools, or otherwise transfer the
actual memory block containing the texture to the new context.

BUG=skia:

Change-Id: I784a3a74be69807df038c7d192eaed002c7e45ca
Reviewed-on: https://skia-review.googlesource.com/8529
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/tools/gpu/GrContextFactory.cpp b/tools/gpu/GrContextFactory.cpp
index 637c569f89..8cfa3f2db0 100644
--- a/tools/gpu/GrContextFactory.cpp
+++ b/tools/gpu/GrContextFactory.cpp
@@ -273,4 +273,16 @@ ContextInfo GrContextFactory::getContextInfo(ContextType type, ContextOverrides
     return ContextInfo(context.fBackend, context.fTestContext, context.fGrContext);
 }
 
+ContextInfo GrContextFactory::getSharedContextInfo(GrContext* shareContext, uint32_t shareIndex) {
+    SkASSERT(shareContext);
+    for (int i = 0; i < fContexts.count(); ++i) {
+        if (!fContexts[i].fAbandoned && fContexts[i].fGrContext == shareContext) {
+            return this->getContextInfo(fContexts[i].fType, fContexts[i].fOverrides,
+                                        shareContext, shareIndex);
+        }
+    }
+
+    return ContextInfo();
+}
+
 }  // namespace sk_gpu_test