Invalidate GrTexture mipmap on content change notification

tests/GrTextureMipMapInvalidationTest.cpp

+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkTypes.h"
+
+#if SK_SUPPORT_GPU
+
+#include "GrContext.h"
+#include "GrContextFactory.h"
+#include "GrTexture.h"
+#include "GrTexturePriv.h"
+#include "SkCanvas.h"
+#include "SkGr.h"
+#include "SkSurface.h"
+#include "Test.h"
+
+// Tests that GrSurface::asTexture(), GrSurface::asRenderTarget(), and static upcasting of texture
+// and render targets to GrSurface all work as expected.
+DEF_GPUTEST(GrTextureMipMapInvalidationTest, reporter, factory) {
+    GrContext* context = factory->get(GrContextFactory::kNull_GLContextType);
+    if (context) {
+        GrSurfaceDesc desc;
+        desc.fConfig = kSkia8888_GrPixelConfig;
+        desc.fFlags = kRenderTarget_GrSurfaceFlag;
+        desc.fWidth = 256;
+        desc.fHeight = 256;
+        desc.fSampleCnt = 0;
+        GrSurface* texRT1 = context->textureProvider()->createTexture(desc, false, NULL, 0);
+        GrSurface* texRT2 = context->textureProvider()->createTexture(desc, false, NULL, 0);
+        REPORTER_ASSERT(reporter, NULL != texRT1);
+        REPORTER_ASSERT(reporter, NULL != texRT2);
+        GrTexture* tex = texRT1->asTexture();
+        REPORTER_ASSERT(reporter, NULL != tex);
+        SkBitmap bitmap;
+        GrWrapTextureInBitmap(tex, 256, 256, false, &bitmap);
+
+        // No mipmaps initially
+        REPORTER_ASSERT(reporter, false == tex->texturePriv().hasMipMaps());
+
+        // Painting with downscale and medium filter quality should result in mipmap creation
+        SkSurface* surface = SkSurface::NewRenderTargetDirect(texRT2->asRenderTarget());
+        SkPaint paint;
+        paint.setFilterQuality(kMedium_SkFilterQuality);
+        surface->getCanvas()->scale(0.2f, 0.2f);
+        surface->getCanvas()->drawBitmap(bitmap, 0, 0, &paint);
+        context->flush();
+
+        REPORTER_ASSERT(reporter, true == tex->texturePriv().hasMipMaps());
+        REPORTER_ASSERT(reporter, false == tex->texturePriv().mipMapsAreDirty());
+
+        // Invalidating the contents of the bitmap should invalidate the mipmap, but not de-allocate
+        bitmap.notifyPixelsChanged();
+        REPORTER_ASSERT(reporter, true == tex->texturePriv().hasMipMaps());
+        REPORTER_ASSERT(reporter, true == tex->texturePriv().mipMapsAreDirty());
+
+        surface->unref();
+        texRT1->unref();
+        texRT2->unref();
+    }
+}
+
+#endif