Use raster mipmap levels when drawing to GPU.

Previously just the base level was uploaded and the level contents
were generated on the GPU.

showmiplevels_explicit now works on GPU.

Bug: skia:11983
Change-Id: I96ed8a7ad90a8252f55a736cb6146eec9b2a3ad1
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/521356
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>

gm/showmiplevels.cpp

@@ -48,11 +48,6 @@ class ShowMipLevels3 : public skiagm::GM {
     }
 
     DrawResult onDraw(SkCanvas* canvas, SkString*) override {
-        if (canvas->recordingContext()) {
-            // mips not supported yet
-            return DrawResult::kSkip;
-        }
-
         canvas->drawColor(0xFFDDDDDD);
 
         canvas->translate(10, 10);

include/core/SkBitmap.h

@@ -1191,6 +1191,7 @@ private:
 
     friend class SkImage_Raster;
     friend class SkReadBuffer;        // unflatten
+    friend class GrProxyProvider;     // fMips
 };
 
 ///////////////////////////////////////////////////////////////////////////////

src/gpu/ganesh/GrProxyProvider.cpp

@@ -269,11 +269,11 @@ GrSurfaceProxyView GrProxyProvider::findCachedProxyWithColorTypeFallback(
 }
 
 sk_sp<GrTextureProxy> GrProxyProvider::createProxyFromBitmap(const SkBitmap& bitmap,
-                                                             GrMipmapped mipMapped,
+                                                             GrMipmapped mipmapped,
                                                              SkBackingFit fit,
                                                              SkBudgeted budgeted) {
     ASSERT_SINGLE_OWNER
-    SkASSERT(fit == SkBackingFit::kExact || mipMapped == GrMipmapped::kNo);
+    SkASSERT(fit == SkBackingFit::kExact || mipmapped == GrMipmapped::kNo);
 
     if (this->isAbandoned()) {
         return nullptr;
@@ -296,12 +296,22 @@ sk_sp<GrTextureProxy> GrProxyProvider::createProxyFromBitmap(const SkBitmap& bit
         if (!bitmap.readPixels(copyBitmap.pixmap())) {
             return nullptr;
         }
+        if (mipmapped == GrMipmapped::kYes && bitmap.fMips) {
+            copyBitmap.fMips = sk_sp<SkMipmap>(SkMipmap::Build(copyBitmap.pixmap(),
+                                                               nullptr,
+                                                               false));
+            for (int i = 0; i < copyBitmap.fMips->countLevels(); ++i) {
+                SkMipmap::Level src, dst;
+                bitmap.fMips->getLevel(i, &src);
+                copyBitmap.fMips->getLevel(i, &dst);
+                src.fPixmap.readPixels(dst.fPixmap);
+            }
+        }
         copyBitmap.setImmutable();
     }
 
     sk_sp<GrTextureProxy> proxy;
-    if (mipMapped == GrMipmapped::kNo ||
+    if (mipmapped == GrMipmapped::kNo || !SkMipmap::ComputeLevelCount(copyBitmap.dimensions())) {
-        0 == SkMipmap::ComputeLevelCount(copyBitmap.width(), copyBitmap.height())) {
         proxy = this->createNonMippedProxyFromBitmap(copyBitmap, fit, budgeted);
     } else {
         proxy = this->createMippedProxyFromBitmap(copyBitmap, budgeted);
@@ -372,10 +382,13 @@ sk_sp<GrTextureProxy> GrProxyProvider::createMippedProxyFromBitmap(const SkBitma
         return nullptr;
     }
 
-    sk_sp<SkMipmap> mipmaps(SkMipmap::Build(bitmap.pixmap(), nullptr));
+    sk_sp<SkMipmap> mipmaps = bitmap.fMips;
+    if (!mipmaps) {
+        mipmaps.reset(SkMipmap::Build(bitmap.pixmap(), nullptr));
         if (!mipmaps) {
             return nullptr;
         }
+    }
 
     auto dims = bitmap.dimensions();
 
@@ -404,7 +417,7 @@ sk_sp<GrTextureProxy> GrProxyProvider::createMippedProxyFromBitmap(const SkBitma
                         GrRenderable::kNo,
                         1,
                         desc.fBudgeted,
-                        GrMipMapped::kYes,
+                        GrMipmapped::kYes,
                         GrProtected::kNo,
                         texels.get()));
             },

src/image/SkImage_Raster.cpp

@@ -453,6 +453,13 @@ std::tuple<GrSurfaceProxyView, GrColorType> SkImage_Raster::onAsView(
         return {fPinnedView, fPinnedColorType};
     }
     if (policy == GrImageTexGenPolicy::kDraw) {
+        // If the draw doesn't require mipmaps but this SkImage has them go ahead and make a
+        // mipmapped texture. There are three reasons for this:
+        // 1) Avoiding another texture creation if a later draw requires mipmaps.
+        // 2) Ensuring we upload the bitmap's levels instead of generating on the GPU from the base.
+        if (this->hasMipmaps()) {
+            mipmapped = GrMipmapped::kYes;
+        }
         return GrMakeCachedBitmapProxyView(rContext, fBitmap, mipmapped);
     }
     auto budgeted = (policy == GrImageTexGenPolicy::kNew_Uncached_Unbudgeted)