Add option to create a deferred render target context with mips

We need this since we have texture generators that draw the base level
but nothing more. Thus we want them to be able to directly draw into
a pre allocated mipped target instead of doing a copy later.

TBR: bsalomon@google.com
Bug: skia:
Change-Id: I1dfae0da7153b21b30fdfa51a7061fc255739a1e
Reviewed-on: https://skia-review.googlesource.com/54100
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/include/private/GrSurfaceProxy.h b/include/private/GrSurfaceProxy.h
index 0c65055611..57724c4e2b 100644
--- a/include/private/GrSurfaceProxy.h
+++ b/include/private/GrSurfaceProxy.h
@@ -194,6 +194,15 @@ public:
                                                     SkDestinationSurfaceColorMode mipColorMode =
                                                            SkDestinationSurfaceColorMode::kLegacy);
 
+    /**
+     * Like the call above but there are no texels to upload. A texture proxy is returned that
+     * simply has space allocated for the mips. We will allocated the full amount of mip levels
+     * based on the width and height in the GrSurfaceDesc.
+     */
+    static sk_sp<GrTextureProxy> MakeDeferredMipMap(GrResourceProvider*,
+                                                    const GrSurfaceDesc& desc, SkBudgeted budgeted);
+
+
     // TODO: need to refine ownership semantics of 'srcData' if we're in completely
     // deferred mode
     static sk_sp<GrTextureProxy> MakeDeferred(GrResourceProvider*,