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, nullptr, 0);
        GrSurface* texRT2 = context->textureProvider()->createTexture(desc, false, nullptr, 0);
        REPORTER_ASSERT(reporter, nullptr != texRT1);
        REPORTER_ASSERT(reporter, nullptr != texRT2);
        GrTexture* tex = texRT1->asTexture();
        REPORTER_ASSERT(reporter, nullptr != 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