/*
  * Copyright 2016 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 "SkBitmap.h"
#include "SkImage.h"
#include "SkImageFilter.h"
#include "SkImageFilterCache.h"
#include "SkMatrix.h"
#include "SkSpecialImage.h"

static const int kSmallerSize = 10;
static const int kPad = 3;
static const int kFullSize = kSmallerSize + 2 * kPad;

static SkBitmap create_bm() {
    SkBitmap bm;
    bm.allocN32Pixels(kFullSize, kFullSize, true);
    bm.eraseColor(SK_ColorTRANSPARENT);
    return bm;
}

// Ensure the cache can return a cached image
static void test_find_existing(skiatest::Reporter* reporter,
                               const sk_sp<SkSpecialImage>& image,
                               const sk_sp<SkSpecialImage>& subset) {
    static const size_t kCacheSize = 1000000;
    sk_sp<SkImageFilterCache> cache(SkImageFilterCache::Create(kCacheSize));

    SkIRect clip = SkIRect::MakeWH(100, 100);
    SkImageFilterCacheKey key1(0, SkMatrix::I(), clip, image->uniqueID(), image->subset());
    SkImageFilterCacheKey key2(0, SkMatrix::I(), clip, subset->uniqueID(), subset->subset());

    SkIPoint offset = SkIPoint::Make(3, 4);
    cache->set(key1, image.get(), offset, nullptr);

    SkIPoint foundOffset;

    sk_sp<SkSpecialImage> foundImage = cache->get(key1, &foundOffset);
    REPORTER_ASSERT(reporter, foundImage);
    REPORTER_ASSERT(reporter, offset == foundOffset);

    REPORTER_ASSERT(reporter, !cache->get(key2, &foundOffset));
}

// If either id is different or the clip or the matrix are different the
// cached image won't be found. Even if it is caching the same bitmap.
static void test_dont_find_if_diff_key(skiatest::Reporter* reporter,
                                       const sk_sp<SkSpecialImage>& image,
                                       const sk_sp<SkSpecialImage>& subset) {
    static const size_t kCacheSize = 1000000;
    sk_sp<SkImageFilterCache> cache(SkImageFilterCache::Create(kCacheSize));

    SkIRect clip1 = SkIRect::MakeWH(100, 100);
    SkIRect clip2 = SkIRect::MakeWH(200, 200);
    SkImageFilterCacheKey key0(0, SkMatrix::I(), clip1, image->uniqueID(), image->subset());
    SkImageFilterCacheKey key1(1, SkMatrix::I(), clip1, image->uniqueID(), image->subset());
    SkImageFilterCacheKey key2(0, SkMatrix::MakeTrans(5, 5), clip1,
                                   image->uniqueID(), image->subset());
    SkImageFilterCacheKey key3(0, SkMatrix::I(), clip2, image->uniqueID(), image->subset());
    SkImageFilterCacheKey key4(0, SkMatrix::I(), clip1, subset->uniqueID(), subset->subset());

    SkIPoint offset = SkIPoint::Make(3, 4);
    cache->set(key0, image.get(), offset, nullptr);

    SkIPoint foundOffset;
    REPORTER_ASSERT(reporter, !cache->get(key1, &foundOffset));
    REPORTER_ASSERT(reporter, !cache->get(key2, &foundOffset));
    REPORTER_ASSERT(reporter, !cache->get(key3, &foundOffset));
    REPORTER_ASSERT(reporter, !cache->get(key4, &foundOffset));
}

// Test purging when the max cache size is exceeded
static void test_internal_purge(skiatest::Reporter* reporter, const sk_sp<SkSpecialImage>& image) {
    SkASSERT(image->getSize());
    const size_t kCacheSize = image->getSize() + 10;
    sk_sp<SkImageFilterCache> cache(SkImageFilterCache::Create(kCacheSize));

    SkIRect clip = SkIRect::MakeWH(100, 100);
    SkImageFilterCacheKey key1(0, SkMatrix::I(), clip, image->uniqueID(), image->subset());
    SkImageFilterCacheKey key2(1, SkMatrix::I(), clip, image->uniqueID(), image->subset());

    SkIPoint offset = SkIPoint::Make(3, 4);
    cache->set(key1, image.get(), offset, nullptr);

    SkIPoint foundOffset;

    REPORTER_ASSERT(reporter, cache->get(key1, &foundOffset));

    // This should knock the first one out of the cache
    cache->set(key2, image.get(), offset, nullptr);

    REPORTER_ASSERT(reporter, cache->get(key2, &foundOffset));
    REPORTER_ASSERT(reporter, !cache->get(key1, &foundOffset));
}

// Exercise the purgeByKey and purge methods
static void test_explicit_purging(skiatest::Reporter* reporter,
                                  const sk_sp<SkSpecialImage>& image,
                                  const sk_sp<SkSpecialImage>& subset) {
    static const size_t kCacheSize = 1000000;
    sk_sp<SkImageFilterCache> cache(SkImageFilterCache::Create(kCacheSize));

    SkIRect clip = SkIRect::MakeWH(100, 100);
    SkImageFilterCacheKey key1(0, SkMatrix::I(), clip, image->uniqueID(), image->subset());
    SkImageFilterCacheKey key2(1, SkMatrix::I(), clip, subset->uniqueID(), image->subset());

    SkIPoint offset = SkIPoint::Make(3, 4);
    cache->set(key1, image.get(), offset, nullptr);
    cache->set(key2, image.get(), offset, nullptr);
    SkDEBUGCODE(REPORTER_ASSERT(reporter, 2 == cache->count());)

    SkIPoint foundOffset;

    REPORTER_ASSERT(reporter, cache->get(key1, &foundOffset));
    REPORTER_ASSERT(reporter, cache->get(key2, &foundOffset));

    cache->purgeByKeys(&key1, 1);
    SkDEBUGCODE(REPORTER_ASSERT(reporter, 1 == cache->count());)

    REPORTER_ASSERT(reporter, !cache->get(key1, &foundOffset));
    REPORTER_ASSERT(reporter, cache->get(key2, &foundOffset));

    cache->purge();
    SkDEBUGCODE(REPORTER_ASSERT(reporter, 0 == cache->count());)

    REPORTER_ASSERT(reporter, !cache->get(key1, &foundOffset));
    REPORTER_ASSERT(reporter, !cache->get(key2, &foundOffset));
}

DEF_TEST(ImageFilterCache_RasterBacked, reporter) {
    SkBitmap srcBM = create_bm();

    const SkIRect& full = SkIRect::MakeWH(kFullSize, kFullSize);

    sk_sp<SkSpecialImage> fullImg(SkSpecialImage::MakeFromRaster(full, srcBM));

    const SkIRect& subset = SkIRect::MakeXYWH(kPad, kPad, kSmallerSize, kSmallerSize);

    sk_sp<SkSpecialImage> subsetImg(SkSpecialImage::MakeFromRaster(subset, srcBM));

    test_find_existing(reporter, fullImg, subsetImg);
    test_dont_find_if_diff_key(reporter, fullImg, subsetImg);
    test_internal_purge(reporter, fullImg);
    test_explicit_purging(reporter, fullImg, subsetImg);
}


// Shared test code for both the raster and gpu-backed image cases
static void test_image_backed(skiatest::Reporter* reporter, const sk_sp<SkImage>& srcImage) {
    const SkIRect& full = SkIRect::MakeWH(kFullSize, kFullSize);
    SkColorSpace* legacyColorSpace = nullptr;

    sk_sp<SkSpecialImage> fullImg(SkSpecialImage::MakeFromImage(full, srcImage, legacyColorSpace));

    const SkIRect& subset = SkIRect::MakeXYWH(kPad, kPad, kSmallerSize, kSmallerSize);

    sk_sp<SkSpecialImage> subsetImg(SkSpecialImage::MakeFromImage(subset, srcImage,
                                                                  legacyColorSpace));

    test_find_existing(reporter, fullImg, subsetImg);
    test_dont_find_if_diff_key(reporter, fullImg, subsetImg);
    test_internal_purge(reporter, fullImg);
    test_explicit_purging(reporter, fullImg, subsetImg);
}

DEF_TEST(ImageFilterCache_ImageBackedRaster, reporter) {
    SkBitmap srcBM = create_bm();

    sk_sp<SkImage> srcImage(SkImage::MakeFromBitmap(srcBM));

    test_image_backed(reporter, srcImage);
}

#if SK_SUPPORT_GPU
#include "GrContext.h"
#include "GrContextPriv.h"
#include "GrResourceProvider.h"
#include "GrSurfaceProxyPriv.h"
#include "GrTest.h"
#include "GrTexture.h"
#include "GrTextureProxy.h"

static sk_sp<GrTextureProxy> create_proxy(GrResourceProvider* resourceProvider) {
    SkBitmap srcBM = create_bm();

    GrSurfaceDesc desc;
    desc.fFlags  = kNone_GrSurfaceFlags;
    desc.fOrigin = kTopLeft_GrSurfaceOrigin;
    desc.fConfig = kRGBA_8888_GrPixelConfig;
    desc.fWidth  = kFullSize;
    desc.fHeight = kFullSize;

    return GrSurfaceProxy::MakeDeferred(resourceProvider,
                                        desc, SkBudgeted::kYes,
                                        srcBM.getPixels(),
                                        srcBM.rowBytes());
}

DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ImageFilterCache_ImageBackedGPU, reporter, ctxInfo) {
    GrContext* context = ctxInfo.grContext();

    sk_sp<GrTextureProxy> srcProxy(create_proxy(context->resourceProvider()));
    if (!srcProxy) {
        return;
    }

    if (!srcProxy->instantiate(context->resourceProvider())) {
        return;
    }
    GrTexture* tex = srcProxy->priv().peekTexture();

    GrBackendTexture backendTex = GrTest::CreateBackendTexture(context->contextPriv().getBackend(),
                                                               kFullSize,
                                                               kFullSize,
                                                               kRGBA_8888_GrPixelConfig,
                                                               tex->getTextureHandle());
    GrSurfaceOrigin texOrigin = kTopLeft_GrSurfaceOrigin;
    sk_sp<SkImage> srcImage(SkImage::MakeFromTexture(context,
                                                     backendTex,
                                                     texOrigin,
                                                     kPremul_SkAlphaType, nullptr));
    if (!srcImage) {
        return;
    }

    GrSurfaceOrigin readBackOrigin;
    GrBackendObject readBackHandle = srcImage->getTextureHandle(false, &readBackOrigin);
    // TODO: Make it so we can check this (see skbug.com/5019)
#if 0
    if (readBackHandle != tex->getTextureHandle()) {
        ERRORF(reporter, "backend mismatch %d %d\n",
                       (int)readBackHandle, (int)tex->getTextureHandle());
    }
    REPORTER_ASSERT(reporter, readBackHandle == tex->getTextureHandle());
#else
    REPORTER_ASSERT(reporter, SkToBool(readBackHandle));
#endif
    if (readBackOrigin != texOrigin) {
        ERRORF(reporter, "origin mismatch %d %d\n", readBackOrigin, texOrigin);
    }
    REPORTER_ASSERT(reporter, readBackOrigin == texOrigin);

    test_image_backed(reporter, srcImage);
}

DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ImageFilterCache_GPUBacked, reporter, ctxInfo) {
    GrContext* context = ctxInfo.grContext();

    sk_sp<GrTextureProxy> srcProxy(create_proxy(context->resourceProvider()));
    if (!srcProxy) {
        return;
    }

    const SkIRect& full = SkIRect::MakeWH(kFullSize, kFullSize);

    sk_sp<SkSpecialImage> fullImg(SkSpecialImage::MakeDeferredFromGpu(
                                                              context, full,
                                                              kNeedNewImageUniqueID_SpecialImage,
                                                              srcProxy, nullptr));

    const SkIRect& subset = SkIRect::MakeXYWH(kPad, kPad, kSmallerSize, kSmallerSize);

    sk_sp<SkSpecialImage> subsetImg(SkSpecialImage::MakeDeferredFromGpu(
                                                                context, subset,
                                                                kNeedNewImageUniqueID_SpecialImage,
                                                                srcProxy, nullptr));

    test_find_existing(reporter, fullImg, subsetImg);
    test_dont_find_if_diff_key(reporter, fullImg, subsetImg);
    test_internal_purge(reporter, fullImg);
    test_explicit_purging(reporter, fullImg, subsetImg);
}
#endif