Creating functions for uploading a mipmapped texture.

src/gpu/SkGr.cpp

Index: src/gpu/SkGr.cpp
diff --git a/src/gpu/SkGr.cpp b/src/gpu/SkGr.cpp
index bb041312450ae278c8ede6bf70dfedc6d02be3ba..fb045caed7d139e5114b39a44f7fd934fee6db1f 100644
--- a/src/gpu/SkGr.cpp
+++ b/src/gpu/SkGr.cpp
@@ -646,6 +646,32 @@ GrTexture* GrRefCachedBitmapTexture(GrContext* ctx,
 
     return NULL;
 }
+
+GrTexture* GrMipmapTexture(GrContext* ctx,
+                           const SkBitmap& bitmap,
+                           SkDiscardableFactoryProc fact,
+                           const GrTextureParams* params) {
+    GrTexture* result = bitmap.getTexture();
+    // TODO: What if the bitmap already contains a non-mitmapped texture?

[scroggo, 2015/07/21 14:44:23]

non-mipmapped?

[cblume, 2015/07/21 23:07:30]

I mean what if someone calls creates a regular texture from a bitmap (this
texture does not have any extra mipmap levels). Then they call this function
passing in that same bitmap.

GrRefCachedBitmapTexture and this function both exit early if the texture was
already created. It just returns that existing texture.

But if the texture was created without any extra mipmap levels, it would be off
to exit early with a non-mipmapped texture.

+    if (result) {
+      // TODO: Add stretching. After reading get_stretch(), it appears small

[scroggo, 2015/07/21 14:44:23]

nit: this should be a four space indent

[cblume, 2015/07/21 23:07:30]

Done.

+      // textures can have issues.
+      return SkRef(result);
+    }
+
+    GrSurfaceDesc desc;
+    generate_bitmap_texture_desc(bitmap, &desc);
+
+    auto mipmap = SkMipMap::Build(bitmap, fact);
+    if (mipmap == NULL) {
+        // could not create the mipmap
+        return NULL;
+    } else {
+        return ctx->textureProvider()->createMipmappedTexture(desc, true, *mipmap);
+        // TODO: BitmapInvalidator support
+    }
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 
 // alphatype is ignore for now, but if GrPixelConfig is expanded to encompass