зеркало из https://github.com/mozilla/gecko-dev.git
91 строка
1.9 KiB
C++
91 строка
1.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_image_Resolution_h
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#define mozilla_image_Resolution_h
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#include "mozilla/Assertions.h"
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#include <cmath>
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namespace mozilla {
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namespace image {
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/**
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* The resolution of an image, in dppx.
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*/
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struct Resolution {
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Resolution() = default;
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Resolution(float aX, float aY) : mX(aX), mY(aY) {
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MOZ_ASSERT(mX != 0.0f);
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MOZ_ASSERT(mY != 0.0f);
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}
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bool operator==(const Resolution& aOther) const {
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return mX == aOther.mX && mY == aOther.mY;
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}
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bool operator!=(const Resolution& aOther) const { return !(*this == aOther); }
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float mX = 1.0f;
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float mY = 1.0f;
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void ScaleBy(float aScale) {
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if (MOZ_LIKELY(aScale != 0.0f)) {
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mX *= aScale;
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mY *= aScale;
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}
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}
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void ApplyXTo(int32_t& aWidth) const {
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if (mX != 1.0f) {
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aWidth = std::round(float(aWidth) / mX);
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}
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}
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void ApplyXTo(float& aWidth) const {
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if (mX != 1.0f) {
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aWidth /= mX;
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}
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}
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void ApplyYTo(int32_t& aHeight) const {
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if (mY != 1.0f) {
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aHeight = std::round(float(aHeight) / mY);
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}
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}
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void ApplyYTo(float& aHeight) const {
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if (mY != 1.0f) {
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aHeight /= mY;
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}
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}
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void ApplyTo(int32_t& aWidth, int32_t& aHeight) const {
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ApplyXTo(aWidth);
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ApplyYTo(aHeight);
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}
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void ApplyTo(float& aWidth, float& aHeight) const {
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ApplyXTo(aWidth);
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ApplyYTo(aHeight);
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}
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void ApplyInverseTo(int32_t& aWidth, int32_t& aHeight) {
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if (mX != 1.0f) {
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aWidth = std::round(float(aWidth) * mX);
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}
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if (mY != 1.0f) {
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aHeight = std::round(float(aHeight) * mY);
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}
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}
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};
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} // namespace image
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using ImageResolution = image::Resolution;
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} // namespace mozilla
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#endif
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