tests/SkGlyphTest.cpp

/*
 * Copyright 2020 Google LLC
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "include/core/SkCanvas.h"
#include "include/core/SkData.h"
#include "include/core/SkDrawable.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPath.h"
#include "include/core/SkPoint.h"
#include "include/core/SkRect.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkTypes.h"
#include "src/base/SkArenaAlloc.h"
#include "src/core/SkGlyph.h"
#include "src/core/SkMask.h"
#include "src/core/SkReadBuffer.h"
#include "src/core/SkWriteBuffer.h"
#include "tests/Test.h"

#include <cstddef>
#include <cstdint>
#include <iterator>
#include <optional>

DEF_TEST(SkGlyphRectBasic, reporter) {
    using namespace skglyph;
    SkGlyphRect r{1, 1, 10, 10};
    REPORTER_ASSERT(reporter, !r.empty());
    SkGlyphRect a = rect_union(r, empty_rect());
    REPORTER_ASSERT(reporter, a.rect() == SkRect::MakeLTRB(1, 1, 10, 10));
    auto widthHeight = a.widthHeight();
    REPORTER_ASSERT(reporter, widthHeight.x() == 9 && widthHeight.y() == 9);

    a = rect_intersection(r, full_rect());
    REPORTER_ASSERT(reporter, a.rect() == SkRect::MakeLTRB(1, 1, 10, 10));

    SkGlyphRect acc = full_rect();
    for (int x = -10; x < 10; x++) {
        for(int y = -10; y < 10; y++) {
            acc = rect_intersection(acc, SkGlyphRect(x, y, x + 20, y + 20));
        }
    }
    REPORTER_ASSERT(reporter, acc.rect() == SkRect::MakeLTRB(9, 9, 10, 10));

    acc = empty_rect();
    for (int x = -10; x < 10; x++) {
        for(int y = -10; y < 10; y++) {
            acc = rect_union(acc, SkGlyphRect(x, y, x + 20, y + 20));
        }
    }
    REPORTER_ASSERT(reporter, acc.rect() == SkRect::MakeLTRB(-10, -10, 29, 29));
}

class SkGlyphTestPeer {
public:
    static void SetGlyph(SkGlyph* glyph) {
        glyph->fAdvanceX = 10;
        glyph->fAdvanceY = 11;
        glyph->fLeft = -1;
        glyph->fTop = -2;
        glyph->fWidth = 8;
        glyph->fHeight = 9;
        glyph->fMaskFormat = SkMask::Format::kA8_Format;
    }
};

DEF_TEST(SkGlyph_SendMetrics, reporter) {
    SkGlyph srcGlyph{SkPackedGlyphID{(SkGlyphID)12}};
    SkGlyphTestPeer::SetGlyph(&srcGlyph);

    SkBinaryWriteBuffer writeBuffer;
    srcGlyph.flattenMetrics(writeBuffer);

    sk_sp<SkData> data = writeBuffer.snapshotAsData();

    SkReadBuffer readBuffer{data->data(), data->size()};
    std::optional<SkGlyph> dstGlyph = SkGlyph::MakeFromBuffer(readBuffer);
    REPORTER_ASSERT(reporter, dstGlyph.has_value());
    REPORTER_ASSERT(reporter, srcGlyph.advanceVector() == dstGlyph->advanceVector());
    REPORTER_ASSERT(reporter, srcGlyph.rect() == dstGlyph->rect());
    REPORTER_ASSERT(reporter, srcGlyph.maskFormat() == dstGlyph->maskFormat());

    uint8_t badData[] = {1, 2, 3, 4, 5, 6, 7, 8};
    SkReadBuffer badBuffer{badData, std::size(badData)};
    dstGlyph = SkGlyph::MakeFromBuffer(badBuffer);
    REPORTER_ASSERT(reporter, !dstGlyph.has_value());
}

DEF_TEST(SkGlyph_SendWithImage, reporter) {
    SkArenaAlloc alloc{256};
    SkGlyph srcGlyph{SkPackedGlyphID{(SkGlyphID)12}};
    SkGlyphTestPeer::SetGlyph(&srcGlyph);

    static constexpr uint8_t X = 0xff;
    static constexpr uint8_t O = 0x00;
    uint8_t imageData[][8] = {
        {X,X,X,X,X,X,X,X},
        {X,O,O,O,O,O,O,X},
        {X,O,O,O,O,O,O,X},
        {X,O,O,O,O,O,O,X},
        {X,O,O,X,X,O,O,X},
        {X,O,O,O,O,O,O,X},
        {X,O,O,O,O,O,O,X},
        {X,O,O,O,O,O,O,X},
        {X,X,X,X,X,X,X,X},
    };

    srcGlyph.setImage(&alloc, imageData);

    SkBinaryWriteBuffer writeBuffer;
    srcGlyph.flattenMetrics(writeBuffer);
    srcGlyph.flattenImage(writeBuffer);

    sk_sp<SkData> data = writeBuffer.snapshotAsData();

    SkReadBuffer readBuffer{data->data(), data->size()};
    std::optional<SkGlyph> dstGlyph = SkGlyph::MakeFromBuffer(readBuffer);
    REPORTER_ASSERT(reporter, dstGlyph.has_value());
    REPORTER_ASSERT(reporter, srcGlyph.advanceVector() == dstGlyph->advanceVector());
    REPORTER_ASSERT(reporter, srcGlyph.rect() == dstGlyph->rect());
    REPORTER_ASSERT(reporter, srcGlyph.maskFormat() == dstGlyph->maskFormat());

    dstGlyph->addImageFromBuffer(readBuffer, &alloc);
    uint8_t* dstImage = (uint8_t*)dstGlyph->image();
    for (int y = 0; y < dstGlyph->height(); ++y) {
        for (int x = 0; x < dstGlyph->width(); ++x) {
            REPORTER_ASSERT(reporter, imageData[y][x] == dstImage[y * dstGlyph->rowBytes() + x]);
        }
    }

    // Add good metrics, but mess up image data
    SkBinaryWriteBuffer badWriteBuffer;
    srcGlyph.flattenMetrics(badWriteBuffer);
    badWriteBuffer.writeInt(7);
    badWriteBuffer.writeInt(8);

    data = badWriteBuffer.snapshotAsData();

    SkReadBuffer badReadBuffer{data->data(), data->size()};
    dstGlyph = SkGlyph::MakeFromBuffer(badReadBuffer);
    REPORTER_ASSERT(reporter, dstGlyph.has_value());
    REPORTER_ASSERT(reporter, srcGlyph.advanceVector() == dstGlyph->advanceVector());
    REPORTER_ASSERT(reporter, srcGlyph.rect() == dstGlyph->rect());
    REPORTER_ASSERT(reporter, srcGlyph.maskFormat() == dstGlyph->maskFormat());

    dstGlyph->addImageFromBuffer(badReadBuffer, &alloc);
    REPORTER_ASSERT(reporter, !badReadBuffer.isValid());
    REPORTER_ASSERT(reporter, !dstGlyph->setImageHasBeenCalled());
}

DEF_TEST(SkGlyph_SendWithPath, reporter) {
    SkArenaAlloc alloc{256};
    SkGlyph srcGlyph{SkPackedGlyphID{(SkGlyphID)12}};
    SkGlyphTestPeer::SetGlyph(&srcGlyph);

    SkPath srcPath;
    srcPath.addRect(srcGlyph.rect());

    srcGlyph.setPath(&alloc, &srcPath, false);

    SkBinaryWriteBuffer writeBuffer;
    srcGlyph.flattenMetrics(writeBuffer);
    srcGlyph.flattenPath(writeBuffer);

    sk_sp<SkData> data = writeBuffer.snapshotAsData();

    SkReadBuffer readBuffer{data->data(), data->size()};
    std::optional<SkGlyph> dstGlyph = SkGlyph::MakeFromBuffer(readBuffer);
    REPORTER_ASSERT(reporter, dstGlyph.has_value());
    REPORTER_ASSERT(reporter, srcGlyph.advanceVector() == dstGlyph->advanceVector());
    REPORTER_ASSERT(reporter, srcGlyph.rect() == dstGlyph->rect());
    REPORTER_ASSERT(reporter, srcGlyph.maskFormat() == dstGlyph->maskFormat());

    dstGlyph->addPathFromBuffer(readBuffer, &alloc);
    REPORTER_ASSERT(reporter, dstGlyph->setPathHasBeenCalled());
    const SkPath* dstPath = dstGlyph->path();
    REPORTER_ASSERT(reporter, *dstPath == srcPath);

    // Add good metrics, but mess up path data
    SkBinaryWriteBuffer badWriteBuffer;
    srcGlyph.flattenMetrics(badWriteBuffer);
    badWriteBuffer.writeInt(7);
    badWriteBuffer.writeInt(8);

    data = badWriteBuffer.snapshotAsData();

    SkReadBuffer badReadBuffer{data->data(), data->size()};
    dstGlyph = SkGlyph::MakeFromBuffer(badReadBuffer);
    REPORTER_ASSERT(reporter, dstGlyph.has_value());
    REPORTER_ASSERT(reporter, srcGlyph.advanceVector() == dstGlyph->advanceVector());
    REPORTER_ASSERT(reporter, srcGlyph.rect() == dstGlyph->rect());
    REPORTER_ASSERT(reporter, srcGlyph.maskFormat() == dstGlyph->maskFormat());

    dstGlyph->addPathFromBuffer(badReadBuffer, &alloc);
    REPORTER_ASSERT(reporter, !badReadBuffer.isValid());
    REPORTER_ASSERT(reporter, !dstGlyph->setPathHasBeenCalled());
}

DEF_TEST(SkGlyph_SendWithDrawable, reporter) {
    SkArenaAlloc alloc{256};
    SkGlyph srcGlyph{SkPackedGlyphID{(SkGlyphID)12}};
    SkGlyphTestPeer::SetGlyph(&srcGlyph);

    class TestDrawable final : public SkDrawable {
    public:
        TestDrawable(SkRect rect) : fRect(rect) {}
    private:
        const SkRect fRect;
        SkRect onGetBounds() override { return fRect;  }
        size_t onApproximateBytesUsed() override {
            return 0;
        }
        void onDraw(SkCanvas* canvas) override {
            SkPaint paint;
            canvas->drawRect(fRect, paint);
        }
    };

    sk_sp<SkDrawable> srcDrawable = sk_make_sp<TestDrawable>(srcGlyph.rect());
    srcGlyph.setDrawable(&alloc, srcDrawable);
    REPORTER_ASSERT(reporter, srcGlyph.setDrawableHasBeenCalled());

    SkBinaryWriteBuffer writeBuffer;
    srcGlyph.flattenMetrics(writeBuffer);
    srcGlyph.flattenDrawable(writeBuffer);

    sk_sp<SkData> data = writeBuffer.snapshotAsData();

    SkReadBuffer readBuffer{data->data(), data->size()};
    std::optional<SkGlyph> dstGlyph = SkGlyph::MakeFromBuffer(readBuffer);
    REPORTER_ASSERT(reporter, dstGlyph.has_value());
    REPORTER_ASSERT(reporter, srcGlyph.advanceVector() == dstGlyph->advanceVector());
    REPORTER_ASSERT(reporter, srcGlyph.rect() == dstGlyph->rect());
    REPORTER_ASSERT(reporter, srcGlyph.maskFormat() == dstGlyph->maskFormat());

    dstGlyph->addDrawableFromBuffer(readBuffer, &alloc);
    REPORTER_ASSERT(reporter, dstGlyph->setDrawableHasBeenCalled());
    SkDrawable* dstDrawable = dstGlyph->drawable();
    REPORTER_ASSERT(reporter, dstDrawable->getBounds() == srcDrawable->getBounds());

    // Add good metrics, but mess up drawable data
    SkBinaryWriteBuffer badWriteBuffer;
    srcGlyph.flattenMetrics(badWriteBuffer);
    badWriteBuffer.writeInt(7);
    badWriteBuffer.writeInt(8);

    data = badWriteBuffer.snapshotAsData();

    SkReadBuffer badReadBuffer{data->data(), data->size()};
    dstGlyph = SkGlyph::MakeFromBuffer(badReadBuffer);
    REPORTER_ASSERT(reporter, dstGlyph.has_value());
    REPORTER_ASSERT(reporter, srcGlyph.advanceVector() == dstGlyph->advanceVector());
    REPORTER_ASSERT(reporter, srcGlyph.rect() == dstGlyph->rect());
    REPORTER_ASSERT(reporter, srcGlyph.maskFormat() == dstGlyph->maskFormat());

    dstGlyph->addDrawableFromBuffer(badReadBuffer, &alloc);
    REPORTER_ASSERT(reporter, !badReadBuffer.isValid());
    REPORTER_ASSERT(reporter, !dstGlyph->setDrawableHasBeenCalled());
}