/*
 * Copyright 2017 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "tests/TestUtils.h"

#include "include/encode/SkPngEncoder.h"
#include "include/utils/SkBase64.h"
#include "src/core/SkAutoPixmapStorage.h"
#include "src/core/SkUtils.h"
#include "src/gpu/GrDirectContextPriv.h"
#include "src/gpu/GrDrawingManager.h"
#include "src/gpu/GrGpu.h"
#include "src/gpu/GrImageInfo.h"
#include "src/gpu/GrRecordingContextPriv.h"
#include "src/gpu/GrSurfaceContext.h"
#include "src/gpu/GrSurfaceProxy.h"
#include "src/gpu/GrTextureProxy.h"
#include "src/gpu/SkGr.h"

void TestReadPixels(skiatest::Reporter* reporter,
                    GrDirectContext* dContext,
                    GrSurfaceContext* srcContext,
                    uint32_t expectedPixelValues[],
                    const char* testName) {
    int pixelCnt = srcContext->width() * srcContext->height();
    SkImageInfo ii = SkImageInfo::Make(srcContext->dimensions(),
                                       kRGBA_8888_SkColorType,
                                       kPremul_SkAlphaType);
    SkAutoPixmapStorage pm;
    pm.alloc(ii);
    pm.erase(SK_ColorTRANSPARENT);

    bool read = srcContext->readPixels(dContext, pm, {0, 0});
    if (!read) {
        ERRORF(reporter, "%s: Error reading from texture.", testName);
    }

    for (int i = 0; i < pixelCnt; ++i) {
        if (pm.addr32()[i] != expectedPixelValues[i]) {
            ERRORF(reporter, "%s: Error, pixel value %d should be 0x%08x, got 0x%08x.",
                   testName, i, expectedPixelValues[i], pm.addr32()[i]);
            break;
        }
    }
}

void TestWritePixels(skiatest::Reporter* reporter,
                     GrDirectContext* dContext,
                     GrSurfaceContext* dstContext,
                     bool expectedToWork,
                     const char* testName) {
    SkImageInfo ii = SkImageInfo::Make(dstContext->dimensions(),
                                       kRGBA_8888_SkColorType,
                                       kPremul_SkAlphaType);
    SkAutoPixmapStorage pm;
    pm.alloc(ii);
    for (int y = 0; y < dstContext->height(); ++y) {
        for (int x = 0; x < dstContext->width(); ++x) {
            *pm.writable_addr32(x, y) = SkColorToPremulGrColor(SkColorSetARGB(2*y, x, y, x + y));
        }
    }

    bool write = dstContext->writePixels(dContext, pm, {0, 0});
    if (!write) {
        if (expectedToWork) {
            ERRORF(reporter, "%s: Error writing to texture.", testName);
        }
        return;
    }

    if (write && !expectedToWork) {
        ERRORF(reporter, "%s: writePixels succeeded when it wasn't supposed to.", testName);
        return;
    }

    TestReadPixels(reporter, dContext, dstContext, pm.writable_addr32(0, 0), testName);
}

void TestCopyFromSurface(skiatest::Reporter* reporter,
                         GrDirectContext* dContext,
                         GrSurfaceProxy* proxy,
                         GrSurfaceOrigin origin,
                         GrColorType colorType,
                         uint32_t expectedPixelValues[],
                         const char* testName) {
    auto copy = GrSurfaceProxy::Copy(dContext, proxy, origin, GrMipmapped::kNo,
                                     SkBackingFit::kExact, SkBudgeted::kYes);
    SkASSERT(copy && copy->asTextureProxy());
    auto swizzle = dContext->priv().caps()->getReadSwizzle(copy->backendFormat(), colorType);
    GrSurfaceProxyView view(std::move(copy), origin, swizzle);
    auto dstContext = GrSurfaceContext::Make(dContext,
                                             std::move(view),
                                             {colorType, kPremul_SkAlphaType, nullptr});
    SkASSERT(dstContext);

    TestReadPixels(reporter, dContext, dstContext.get(), expectedPixelValues, testName);
}

bool BipmapToBase64DataURI(const SkBitmap& bitmap, SkString* dst) {
    SkPixmap pm;
    if (!bitmap.peekPixels(&pm)) {
        dst->set("peekPixels failed");
        return false;
    }

    // We're going to embed this PNG in a data URI, so make it as small as possible
    SkPngEncoder::Options options;
    options.fFilterFlags = SkPngEncoder::FilterFlag::kAll;
    options.fZLibLevel = 9;

    SkDynamicMemoryWStream wStream;
    if (!SkPngEncoder::Encode(&wStream, pm, options)) {
        dst->set("SkPngEncoder::Encode failed");
        return false;
    }

    sk_sp<SkData> pngData = wStream.detachAsData();
    size_t len = SkBase64::Encode(pngData->data(), pngData->size(), nullptr);

    // The PNG can be almost arbitrarily large. We don't want to fill our logs with enormous URLs.
    // Infra says these can be pretty big, as long as we're only outputting them on failure.
    static const size_t kMaxBase64Length = 1024 * 1024;
    if (len > kMaxBase64Length) {
        dst->printf("Encoded image too large (%u bytes)", static_cast<uint32_t>(len));
        return false;
    }

    dst->resize(len);
    SkBase64::Encode(pngData->data(), pngData->size(), dst->writable_str());
    dst->prepend("data:image/png;base64,");
    return true;
}

using AccessPixelFn = const float*(const char* floatBuffer, int x, int y);

bool compare_pixels(int width, int height,
                    const char* floatA, std::function<AccessPixelFn>& atA,
                    const char* floatB, std::function<AccessPixelFn>& atB,
                    const float tolRGBA[4], std::function<ComparePixmapsErrorReporter>& error) {

    for (int y = 0; y < height; ++y) {
        for (int x = 0; x < width; ++x) {
            const float* rgbaA = atA(floatA, x, y);
            const float* rgbaB = atB(floatB, x, y);
            float diffs[4];
            bool bad = false;
            for (int i = 0; i < 4; ++i) {
                diffs[i] = rgbaB[i] - rgbaA[i];
                if (std::abs(diffs[i]) > std::abs(tolRGBA[i])) {
                    bad = true;
                }
            }
            if (bad) {
                error(x, y, diffs);
                return false;
            }
        }
    }
    return true;
}

bool ComparePixels(const GrImageInfo& infoA, const char* a, size_t rowBytesA,
                   const GrImageInfo& infoB, const char* b, size_t rowBytesB,
                   const float tolRGBA[4], std::function<ComparePixmapsErrorReporter>& error) {
    if (infoA.width() != infoB.width() || infoA.height() != infoB.height()) {
        static constexpr float kDummyDiffs[4] = {};
        error(-1, -1, kDummyDiffs);
        return false;
    }

    SkAlphaType floatAlphaType = infoA.alphaType();
    // If one is premul and the other is unpremul we do the comparison in premul space.
    if ((infoA.alphaType() == kPremul_SkAlphaType ||
         infoB.alphaType() == kPremul_SkAlphaType) &&
        (infoA.alphaType() == kUnpremul_SkAlphaType ||
         infoB.alphaType() == kUnpremul_SkAlphaType)) {
        floatAlphaType = kPremul_SkAlphaType;
    }
    sk_sp<SkColorSpace> floatCS;
    if (SkColorSpace::Equals(infoA.colorSpace(), infoB.colorSpace())) {
        floatCS = infoA.refColorSpace();
    } else {
        floatCS = SkColorSpace::MakeSRGBLinear();
    }
    GrImageInfo floatInfo(GrColorType::kRGBA_F32, floatAlphaType, std::move(floatCS),
                          infoA.width(), infoA.height());

    size_t floatBpp = GrColorTypeBytesPerPixel(GrColorType::kRGBA_F32);
    size_t floatRowBytes = floatBpp * infoA.width();
    std::unique_ptr<char[]> floatA(new char[floatRowBytes * infoA.height()]);
    std::unique_ptr<char[]> floatB(new char[floatRowBytes * infoA.height()]);
    SkAssertResult(GrConvertPixels(floatInfo, floatA.get(), floatRowBytes, infoA, a, rowBytesA));
    SkAssertResult(GrConvertPixels(floatInfo, floatB.get(), floatRowBytes, infoB, b, rowBytesB));

    auto at = std::function<AccessPixelFn>(
        [floatBpp, floatRowBytes](const char* floatBuffer, int x, int y) {
            return reinterpret_cast<const float*>(floatBuffer + y * floatRowBytes + x * floatBpp);
        });

    return compare_pixels(infoA.width(), infoA.height(),
                          floatA.get(), at, floatB.get(), at,
                          tolRGBA, error);
}

bool ComparePixels(const SkPixmap& a, const SkPixmap& b, const float tolRGBA[4],
                   std::function<ComparePixmapsErrorReporter>& error) {
    return ComparePixels(a.info(), static_cast<const char*>(a.addr()), a.rowBytes(),
                         b.info(), static_cast<const char*>(b.addr()), b.rowBytes(),
                         tolRGBA, error);
}

bool CheckSolidPixels(const SkColor4f& col, const SkPixmap& pixmap,
                      const float tolRGBA[4], std::function<ComparePixmapsErrorReporter>& error) {

    size_t floatBpp = GrColorTypeBytesPerPixel(GrColorType::kRGBA_F32);

    std::unique_ptr<char[]> floatA(new char[floatBpp]);
    // First convert 'col' to be compatible with 'pixmap'
    {
        sk_sp<SkColorSpace> srcCS = SkColorSpace::MakeSRGBLinear();
        GrImageInfo srcInfo(GrColorType::kRGBA_F32, kUnpremul_SkAlphaType, std::move(srcCS), 1, 1);
        GrImageInfo dstInfo(GrColorType::kRGBA_F32, pixmap.alphaType(), pixmap.refColorSpace(), 1, 1);

        SkAssertResult(GrConvertPixels(dstInfo, floatA.get(), floatBpp, srcInfo,
                                       col.vec(), floatBpp));
    }

    size_t floatRowBytes = floatBpp * pixmap.width();
    std::unique_ptr<char[]> floatB(new char[floatRowBytes * pixmap.height()]);
    // Then convert 'pixmap' to RGBA_F32
    {
        GrImageInfo dstInfo(GrColorType::kRGBA_F32, pixmap.alphaType(), pixmap.refColorSpace(),
                            pixmap.width(), pixmap.height());

        SkAssertResult(GrConvertPixels(dstInfo, floatB.get(), floatRowBytes, pixmap.info(),
                                       pixmap.addr(), pixmap.rowBytes()));
    }

    auto atA = std::function<AccessPixelFn>(
        [](const char* floatBuffer, int /* x */, int /* y */) {
            return reinterpret_cast<const float*>(floatBuffer);
        });

    auto atB = std::function<AccessPixelFn>(
        [floatBpp, floatRowBytes](const char* floatBuffer, int x, int y) {
            return reinterpret_cast<const float*>(floatBuffer + y * floatRowBytes + x * floatBpp);
        });

    return compare_pixels(pixmap.width(), pixmap.height(), floatA.get(), atA, floatB.get(), atB,
                          tolRGBA, error);
}

void CheckSingleThreadedProxyRefs(skiatest::Reporter* reporter,
                                  GrSurfaceProxy* proxy,
                                  int32_t expectedProxyRefs,
                                  int32_t expectedBackingRefs) {
    int32_t actualBackingRefs = proxy->testingOnly_getBackingRefCnt();

    REPORTER_ASSERT(reporter, proxy->refCntGreaterThan(expectedProxyRefs - 1) &&
                              !proxy->refCntGreaterThan(expectedProxyRefs));
    REPORTER_ASSERT(reporter, actualBackingRefs == expectedBackingRefs);
}

#include "src/utils/SkCharToGlyphCache.h"

static SkGlyphID hash_to_glyph(uint32_t value) {
    return SkToU16(((value >> 16) ^ value) & 0xFFFF);
}

namespace {
class UnicharGen {
    SkUnichar fU;
    const int fStep;
public:
    UnicharGen(int step) : fU(0), fStep(step) {}

    SkUnichar next() {
        fU += fStep;
        return fU;
    }
};
}  // namespace

DEF_TEST(chartoglyph_cache, reporter) {
    SkCharToGlyphCache cache;
    const int step = 3;

    UnicharGen gen(step);
    for (int i = 0; i < 500; ++i) {
        SkUnichar c = gen.next();
        SkGlyphID glyph = hash_to_glyph(c);

        int index = cache.findGlyphIndex(c);
        if (index >= 0) {
            index = cache.findGlyphIndex(c);
        }
        REPORTER_ASSERT(reporter, index < 0);
        cache.insertCharAndGlyph(~index, c, glyph);

        UnicharGen gen2(step);
        for (int j = 0; j <= i; ++j) {
            c = gen2.next();
            glyph = hash_to_glyph(c);
            index = cache.findGlyphIndex(c);
            if ((unsigned)index != glyph) {
                index = cache.findGlyphIndex(c);
            }
            REPORTER_ASSERT(reporter, (unsigned)index == glyph);
        }
    }
}