Tools/TestWebKitAPI/Tests/WebCore/ImageBufferTests.cpp

/*
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#include "config.h"

#include <WebCore/ImageBuffer.h>
#include <WebCore/PlatformImageBuffer.h>

namespace TestWebKitAPI {
using namespace WebCore;

// Tests that the specialized image buffer constructors construct the expected type of object.
// Test passes if the test compiles, there was a bug where the code wouldn't compile.
TEST(ImageBufferTests, ImageBufferSubTypeCreateCreatesSubtypes)
{
    auto colorSpace = DestinationColorSpace::SRGB();
    auto pixelFormat = PixelFormat::BGRA8;
    FloatSize size { 1.f, 1.f };
    float scale = 1.f;
    RefPtr<UnacceleratedImageBuffer> unaccelerated = UnacceleratedImageBuffer::create(size, scale, colorSpace, pixelFormat, nullptr);
    RefPtr<AcceleratedImageBuffer> accelerated = AcceleratedImageBuffer::create(size, scale, colorSpace, pixelFormat, nullptr);
    RefPtr<DisplayListAcceleratedImageBuffer> displayListAccelerated = DisplayListAcceleratedImageBuffer::create(size, scale, colorSpace, pixelFormat, nullptr);
    RefPtr<DisplayListUnacceleratedImageBuffer> displayListUnaccelerated = DisplayListUnacceleratedImageBuffer::create(size, scale, colorSpace, pixelFormat, nullptr);
    EXPECT_NE(nullptr, accelerated);
    EXPECT_NE(nullptr, unaccelerated);
    EXPECT_NE(nullptr, displayListAccelerated);
    EXPECT_NE(nullptr, displayListUnaccelerated);
}

TEST(ImageBufferTests, ImageBufferSubPixelDrawing)
{
    auto colorSpace = DestinationColorSpace::SRGB();
    auto pixelFormat = PixelFormat::BGRA8;
    FloatSize logicalSize { 392, 44 };
    float scale = 1.91326535;
    auto frontImageBuffer = ImageBuffer::create(logicalSize, RenderingMode::Accelerated, scale, colorSpace, pixelFormat, nullptr);
    auto backImageBuffer = ImageBuffer::create(logicalSize, RenderingMode::Accelerated, scale, colorSpace, pixelFormat, nullptr);
    
    auto strokeRect = FloatRect { { }, logicalSize };
    strokeRect.inflate(-0.5);
    auto fillRect = strokeRect;
    fillRect.inflate(-1);

    auto& frontContext = frontImageBuffer->context();
    auto& backContext = backImageBuffer->context();

    frontContext.setShouldAntialias(false);
    backContext.setShouldAntialias(false);

    frontContext.setStrokeColor(Color::red);
    frontContext.strokeRect(strokeRect, 1);
    
    frontContext.fillRect(fillRect, Color::green);

    for (int i = 0; i < 1000; ++i) {
        backContext.drawImageBuffer(*frontImageBuffer, WebCore::FloatPoint { }, { WebCore::CompositeOperator::Copy });
        frontContext.drawImageBuffer(*backImageBuffer, WebCore::FloatPoint { }, { WebCore::CompositeOperator::Copy });
    }

    auto checkGreenPixel = [&](ImageBuffer& imageBuffer, int x, int y) {
        PixelBufferFormat format { AlphaPremultiplication::Unpremultiplied, PixelFormat::RGBA8, colorSpace };
        auto frontPixelBuffer = imageBuffer.getPixelBuffer(format, { x, y, 1, 1 });
        auto& data = frontPixelBuffer->data();

        EXPECT_EQ(data.item(0), 0x00);
        EXPECT_EQ(data.item(1), 0xff);
        EXPECT_EQ(data.item(2), 0x00);
        EXPECT_EQ(data.item(3), 0xff);
    };

    checkGreenPixel(*frontImageBuffer, fillRect.x()    + 1, fillRect.y()    + 1);
    checkGreenPixel(*frontImageBuffer, fillRect.maxX() - 1, fillRect.y()    + 1);
    checkGreenPixel(*frontImageBuffer, fillRect.x()    + 1, fillRect.maxY() - 1);
    checkGreenPixel(*frontImageBuffer, fillRect.maxX() - 1, fillRect.maxY() - 1);

    checkGreenPixel(*backImageBuffer, fillRect.x()    + 1, fillRect.y()    + 1);
    checkGreenPixel(*backImageBuffer, fillRect.maxX() - 1, fillRect.y()    + 1);
    checkGreenPixel(*backImageBuffer, fillRect.x()    + 1, fillRect.maxY() - 1);
    checkGreenPixel(*backImageBuffer, fillRect.maxX() - 1, fillRect.maxY() - 1);
}

}