MakeBackendTextureFromSkImage

Creates a static function on SkImage which converts the SkImage to a
GrBackendTexture. The texture is unowned by Skia, and must be deleted
by the caller. Allows for a no-copy / no-conversion fast path if the
provided image is unowned (unique()) and texture backed.

Change-Id: I8a48f9cc39de792725cd72057d98cd1c4594daab
Reviewed-on: https://skia-review.googlesource.com/52440
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Eric Karl <ericrk@chromium.org>

1 files changed, 20 insertions, 0 deletions

diff --git a/src/gpu/GrTexture.cpp b/src/gpu/GrTexture.cpp
index 250b6dd167..b0dba5142e 100644
--- a/src/gpu/GrTexture.cpp
+++ b/src/gpu/GrTexture.cpp
@@ -10,6 +10,7 @@
 #include "GrGpu.h"
 #include "GrResourceKey.h"
 #include "GrRenderTarget.h"
+#include "GrSurfacePriv.h"
 #include "GrTexture.h"
 #include "GrTexturePriv.h"
 #include "GrTypes.h"
@@ -56,6 +57,25 @@ GrTexture::GrTexture(GrGpu* gpu, const GrSurfaceDesc& desc, GrSLType samplerType
     }
 }
 
+bool GrTexture::StealBackendTexture(sk_sp<GrTexture>&& texture,
+                                    GrBackendTexture* backendTexture,
+                                    SkImage::BackendTextureReleaseProc* releaseProc) {
+    if (!texture->surfacePriv().hasUniqueRef() || texture->surfacePriv().hasPendingIO()) {
+        return false;
+    }
+
+    if (!texture->onStealBackendTexture(backendTexture, releaseProc)) {
+        return false;
+    }
+
+    // Release any not-stolen data being held by this class.
+    texture->onRelease();
+    // Abandon the GrTexture so it can't be re-used.
+    texture->abandon();
+
+    return true;
+}
+
 void GrTexture::computeScratchKey(GrScratchKey* key) const {
     const GrRenderTarget* rt = this->asRenderTarget();
     int sampleCount = 0;