/*
 * Copyright 2012 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "Test.h"
#include "SkGpuDevice.h"
#include "../../src/gpu/GrClipMaskManager.h"

static const int X_SIZE = 12;
static const int Y_SIZE = 12;

////////////////////////////////////////////////////////////////////////////////
static GrTexture* createTexture(GrContext* context) {
    unsigned char textureData[X_SIZE][Y_SIZE];

    memset(textureData, 0, X_SIZE * Y_SIZE);

    GrTextureDesc desc;

    // let Skia know we will be using this texture as a render target
    desc.fFlags     = kRenderTarget_GrTextureFlagBit;
    // it is a single channel texture
    desc.fConfig    = kAlpha_8_GrPixelConfig;
    desc.fWidth     = X_SIZE;
    desc.fHeight    = Y_SIZE;
    desc.fSampleCnt = 0;

    // We are initializing the texture with zeros here
    GrTexture* texture = context->createUncachedTexture(desc, textureData, 0);
    if (!texture) {
        return NULL;
    }

    return texture;
}

////////////////////////////////////////////////////////////////////////////////
// verify that the top state of the stack matches the passed in state
static void check_state(skiatest::Reporter* reporter,
                        const GrClipMaskCache& cache,
                        int width,
                        int height,
                        const GrClip& clip,
                        GrTexture* mask,
                        const GrRect& bound) {
    REPORTER_ASSERT(reporter, width == cache.getLastWidth());
    REPORTER_ASSERT(reporter, height == cache.getLastHeight());

    GrClip cacheClip;
    cache.getLastClip(&cacheClip);
    REPORTER_ASSERT(reporter, clip == cacheClip);

    REPORTER_ASSERT(reporter, mask == cache.getLastMask());

    GrRect cacheBound;
    cache.getLastBound(&cacheBound);
    REPORTER_ASSERT(reporter, bound == cacheBound);
}

////////////////////////////////////////////////////////////////////////////////
// basic test of the cache's base functionality:
//  push, pop, set, canReuse & getters
static void test_cache(skiatest::Reporter* reporter, GrContext* context) {

    GrClipMaskCache cache;

    GrClip emptyClip;
    emptyClip.setEmpty();

    GrRect emptyBound;
    emptyBound.setEmpty();

    // check initial state
    check_state(reporter, cache, -1, -1, emptyClip, NULL, emptyBound);

    // set the current state
    GrRect bound1;
    bound1.set(0, 0, 100, 100);

    GrClip clip1;
    clip1.setFromRect(bound1);

    SkAutoTUnref<GrTexture> texture(createTexture(context));

    cache.set(clip1, 128, 128, texture.get(), bound1);

    // check that the set took
    check_state(reporter, cache, 128, 128, clip1, texture.get(), bound1);
    REPORTER_ASSERT(reporter, 2 == texture.get()->getRefCnt());

    // push the state
    cache.push();

    // verify that the pushed state is initially empty
    check_state(reporter, cache, -1, -1, emptyClip, NULL, emptyBound);
    REPORTER_ASSERT(reporter, 2 == texture.get()->getRefCnt());

    // modify the new state
    GrRect bound2;
    bound2.set(-10, -10, 10, 10);

    GrClip clip2;
    clip2.setEmpty();
    clip2.setFromRect(bound2);

    cache.set(clip2, 10, 10, texture.get(), bound2);

    // check that the changes took
    check_state(reporter, cache, 10, 10, clip2, texture.get(), bound2);
    REPORTER_ASSERT(reporter, 3 == texture.get()->getRefCnt());

    // check to make sure canReuse works
    REPORTER_ASSERT(reporter, cache.canReuse(clip2, 10, 10));
    REPORTER_ASSERT(reporter, !cache.canReuse(clip1, 10, 10));

    // pop the state
    cache.pop();

    // verify that the old state is restored
    check_state(reporter, cache, 128, 128, clip1, texture.get(), bound1);
    REPORTER_ASSERT(reporter, 2 == texture.get()->getRefCnt());

    // manually clear the state
    cache.reset();

    // verify it is now empty
    check_state(reporter, cache, -1, -1, emptyClip, NULL, emptyBound);
    REPORTER_ASSERT(reporter, 1 == texture.get()->getRefCnt());

    // pop again - so there is no state
    cache.pop();

#if !defined(SK_DEBUG)
    // verify that the getters don't crash
    // only do in release since it generates asserts in debug
    check_state(reporter, cache, -1, -1, emptyClip, NULL, emptyBound);
#endif
    REPORTER_ASSERT(reporter, 1 == texture.get()->getRefCnt());
}

////////////////////////////////////////////////////////////////////////////////
static void TestClipCache(skiatest::Reporter* reporter, GrContext* context) {

    test_cache(reporter, context);
}

////////////////////////////////////////////////////////////////////////////////
#include "TestClassDef.h"
DEFINE_GPUTESTCLASS("ClipCache", ClipCacheTestClass, TestClipCache)