Add an (optional) SkTaskGroup to GrContext

GrContextOptions has an SkExecutor field, allowing clients to supply a
thread pool. If present, the GrContext will create an SkTaskGroup that
can be used for internal threading work.

Bug: skia:
Change-Id: I8b01245515a21a83f9fe838caf0a01c9a26c0003
Reviewed-on: https://skia-review.googlesource.com/37580
Reviewed-by: Greg Daniel <egdaniel@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>

2 files changed, 13 insertions, 0 deletions

diff --git a/include/gpu/GrContext.h b/include/gpu/GrContext.h
index 61446875cc..7510a7312d 100644
--- a/include/gpu/GrContext.h
+++ b/include/gpu/GrContext.h
@@ -46,6 +46,7 @@ class SkTraceMemoryDump;
 
 class SkImage;
 class SkSurfaceProps;
+class SkTaskGroup;
 
 class SK_API GrContext : public SkRefCnt {
 public:
@@ -359,6 +360,8 @@ private:
     // GrRenderTargetContexts.  It is also passed to the GrResourceProvider and SkGpuDevice.
     mutable GrSingleOwner                   fSingleOwner;
 
+    std::unique_ptr<SkTaskGroup>            fTaskGroup;
+
     struct CleanUpData {
         PFCleanUpFunc fFunc;
         void*         fInfo;
diff --git a/include/gpu/GrContextOptions.h b/include/gpu/GrContextOptions.h
index f560b31e7b..d01d0725a6 100644
--- a/include/gpu/GrContextOptions.h
+++ b/include/gpu/GrContextOptions.h
@@ -11,6 +11,8 @@
 #include "SkTypes.h"
 #include "GrTypes.h"
 
+class SkExecutor;
+
 struct GrContextOptions {
     GrContextOptions() {}
 
@@ -33,6 +35,14 @@ struct GrContextOptions {
         deduce the optimal value for this platform. */
     int  fBufferMapThreshold = -1;
 
+    /**
+     * Executor to handle threaded work within Ganesh. If this is nullptr, then all work will be
+     * done serially on the main thread. To have worker threads assist with various tasks, set this
+     * to a valid SkExecutor instance. Currently, used for software path rendering, but may be used
+     * for other tasks.
+     */
+    SkExecutor* fExecutor = nullptr;
+
     /** some gpus have problems with partial writes of the rendertarget */
     bool fUseDrawInsteadOfPartialRenderTargetWrite = false;