Tools/TestWebKitAPI/cocoa/CGImagePixelReader.cpp

/*
 * Copyright (C) 2023 Apple Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *
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#include "config.h"
#include "CGImagePixelReader.h"

#include <WebCore/Color.h>
#include <WebCore/ColorSerialization.h>
#include <wtf/Vector.h>

namespace TestWebKitAPI {
using namespace WebCore;

CGImagePixelReader::CGImagePixelReader(CGImageRef image)
    : m_width(CGImageGetWidth(image))
    , m_height(CGImageGetHeight(image))
{
    auto colorSpace = adoptCF(CGColorSpaceCreateWithName(kCGColorSpaceSRGB));
    auto bytesPerPixel = 4;
    auto bytesPerRow = bytesPerPixel * CGImageGetWidth(image);
    auto bitsPerComponent = 8;
IGNORE_WARNINGS_BEGIN("deprecated-enum-enum-conversion")
    CGBitmapInfo bitmapInfo = kCGImageAlphaPremultipliedLast | kCGImageByteOrder32Big;
IGNORE_WARNINGS_END
    m_context = adoptCF(CGBitmapContextCreateWithData(nullptr, m_width, m_height, bitsPerComponent, bytesPerRow, colorSpace.get(), bitmapInfo, nullptr, nullptr));
    CGContextDrawImage(m_context.get(), CGRectMake(0, 0, m_width, m_height), image);
}

bool CGImagePixelReader::isTransparentBlack(unsigned x, unsigned y) const
{
    return at(x, y) == Color::transparentBlack;
}

String CGImagePixelReader::cssColorAt(unsigned x, unsigned y) const
{
    return WebCore::serializationForCSS(at(x, y));
}

Color CGImagePixelReader::at(unsigned x, unsigned y) const
{
    auto* data = static_cast<uint8_t*>(CGBitmapContextGetData(m_context.get()));
    auto offset = 4 * (width() * y + x);
    return makeFromComponentsClampingExceptAlpha<SRGBA<uint8_t>>(data[offset], data[offset + 1], data[offset + 2], data[offset + 3]);
}

} // namespace TestWebKitAPI