static GrRenderTarget* prepare_rt_for_external_access(SkSurface_Gpu* surface,
SkSurface::BackendHandleAccess access) {
GrRenderTarget* rt = surface->getDevice()->accessRenderTarget();
switch (access) {
case SkSurface::kFlushRead_BackendHandleAccess:
break;
case SkSurface::kFlushWrite_BackendHandleAccess:
case SkSurface::kDiscardWrite_BackendHandleAccess:
// for now we don't special-case on Discard, but we may in the future.
surface->notifyContentWillChange(SkSurface::kRetain_ContentChangeMode);
// legacy: need to dirty the bitmap's genID in our device (curse it)
surface->getDevice()->accessBitmap(false).notifyPixelsChanged();
break;
}
rt->prepareForExternalIO();
return rt;
}
