65 lines
1.7 KiB
Plaintext
65 lines
1.7 KiB
Plaintext
/*!
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* \copyright Copyright (c) 2015-2018 Governikus GmbH & Co. KG, Germany
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*/
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#include "DpiCalculator.h"
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#include <QGuiApplication>
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#include <QLoggingCategory>
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#import <UIKit/UIKit.h>
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Q_DECLARE_LOGGING_CATEGORY(qml)
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using namespace governikus;
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#define IS_IPAD (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
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#define IS_IPHONE (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
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#define IS_RETINA ([[UIScreen mainScreen] scale] >= 2.0)
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// screen height is orientation dependent
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#define SCREEN_WIDTH ([[UIScreen mainScreen] bounds].size.width)
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#define SCREEN_HEIGHT ([[UIScreen mainScreen] bounds].size.height)
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#define SCREEN_MAX_LENGTH (qMax(SCREEN_WIDTH, SCREEN_HEIGHT))
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#define IS_IPHONE_4 (IS_IPHONE && SCREEN_MAX_LENGTH == 480.0 && IS_RETINA)
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#define IS_IPHONE_5 (IS_IPHONE && SCREEN_MAX_LENGTH == 568.0)
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#define IS_IPHONE_6 (IS_IPHONE && SCREEN_MAX_LENGTH == 667.0)
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#define IS_IPHONE_6PLUS (IS_IPHONE && SCREEN_MAX_LENGTH == 736.0)
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qreal DpiCalculator::getDpi()
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{
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qreal dpi;
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qreal renderFactor = [UIScreen mainScreen].scale;
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if (IS_IPHONE_4 || IS_IPHONE_5 || IS_IPHONE_6)
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{
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dpi = 326.0;
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}
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else if (IS_IPHONE_6PLUS)
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{
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dpi = 401.0;
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renderFactor /= 1.15; // the iPhone 6 plus is downsampled
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}
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else if (IS_IPAD)
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{
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dpi = 264.0;
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}
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else
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{
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qCCritical(qml) << "Unknown iOS device, cannot determine dpi";
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return -1.0;
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}
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/*
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* For some reason on iOS the unit is interpreted per point, not per pixel.
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* Therefore we adapt it to points per inch by dividing by the render factor.
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* See: http://www.paintcodeapp.com/news/ultimate-guide-to-iphone-resolutions
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*/
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dpi /= renderFactor;
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qCInfo(qml) << "Determined dpi" << dpi;
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return dpi;
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}
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