third_party/WebKit/Source/core/style/StyleImage.cpp

// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "core/style/StyleImage.h"

#include "core/svg/graphics/SVGImage.h"
#include "core/svg/graphics/SVGImageForContainer.h"

namespace blink {

LayoutSize StyleImage::applyZoom(const LayoutSize& size, float multiplier)
{
    if (multiplier == 1.0f)
        return size;

    LayoutUnit width(size.width() * multiplier);
    LayoutUnit height(size.height() * multiplier);

    // Don't let images that have a width/height >= 1 shrink below 1 when zoomed.
    if (size.width() > LayoutUnit())
        width = std::max(LayoutUnit(1), width);

    if (size.height() > LayoutUnit())
        height = std::max(LayoutUnit(1), height);

    return LayoutSize(width, height);
}

LayoutSize StyleImage::imageSizeForSVGImage(SVGImage* svgImage, float multiplier, const LayoutSize& defaultObjectSize) const
{
    FloatSize unzoomedDefaultObjectSize(defaultObjectSize);
    unzoomedDefaultObjectSize.scale(1 / multiplier);
    LayoutSize imageSize(roundedIntSize(svgImage->concreteObjectSize(unzoomedDefaultObjectSize)));
    return applyZoom(imageSize, multiplier);
}

} // namespace blink