Creating functions for uploading a mipmapped texture.

src/gpu/SkGr.cpp

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkGr.h"
 
 #include "GrCaps.h"
@@ skipping 628 matching lines @@
     if (result) {
         return result;
     }
 
     SkErrorInternals::SetError( kInternalError_SkError,
                                 "---- failed to create texture for cache [%d %d]\n",
                                 bitmap.width(), bitmap.height());
 
     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-mipmapped texture?
+    if (result) {
+        // TODO: Add stretching. After reading get_stretch(), it appears small
+        // 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
 // alpha info, that will be considered.
 GrPixelConfig SkImageInfo2GrPixelConfig(SkColorType ct, SkAlphaType, SkColorProfileType pt) {
     switch (ct) {
         case kUnknown_SkColorType:
             return kUnknown_GrPixelConfig;
         case kAlpha_8_SkColorType:
             return kAlpha_8_GrPixelConfig;
@@ skipping 167 matching lines @@
     }
     return SkImageInfo::Make(w, h, ct, at);
 }
 
 
 void GrWrapTextureInBitmap(GrTexture* src, int w, int h, bool isOpaque, SkBitmap* dst) {
     const SkImageInfo info = GrMakeInfoFromTexture(src, w, h, isOpaque);
     dst->setInfo(info);
     dst->setPixelRef(SkNEW_ARGS(SkGrPixelRef, (info, src)))->unref();
 }