mirror of https://github.com/JakubMelka/PDF4QT.git
87 lines
2.8 KiB
C++
87 lines
2.8 KiB
C++
// Copyright (C) 2019-2020 Jakub Melka
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//
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// This file is part of PdfForQt.
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//
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// PdfForQt is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// PdfForQt is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with PDFForQt. If not, see <https://www.gnu.org/licenses/>.
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#include "pdfwidgetutils.h"
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#ifdef Q_OS_MAC
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int qt_default_dpi_x() { return 72; }
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int qt_default_dpi_y() { return 72; }
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#else
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int qt_default_dpi_x() { return 96; }
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int qt_default_dpi_y() { return 96; }
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#endif
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namespace pdf
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{
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int PDFWidgetUtils::getPixelSize(QPaintDevice* device, pdf::PDFReal sizeMM)
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{
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const int width = device->width();
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const int height = device->height();
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if (width > height)
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{
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return PDFReal(width) * sizeMM / PDFReal(device->widthMM());
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}
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else
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{
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return PDFReal(height) * sizeMM / PDFReal(device->heightMM());
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}
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}
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int PDFWidgetUtils::scaleDPI_x(QPaintDevice* device, int unscaledSize)
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{
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const double logicalDPI_x = device->logicalDpiX();
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const double defaultDPI_x = qt_default_dpi_x();
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return (logicalDPI_x / defaultDPI_x) * unscaledSize;
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}
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PDFReal PDFWidgetUtils::scaleDPI_x(QPaintDevice* device, PDFReal unscaledSize)
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{
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const double logicalDPI_x = device->logicalDpiX();
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const double defaultDPI_x = qt_default_dpi_x();
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return (logicalDPI_x / defaultDPI_x) * unscaledSize;
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}
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void PDFWidgetUtils::scaleWidget(QWidget* widget, QSize unscaledSize)
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{
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const double logicalDPI_x = widget->logicalDpiX();
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const double logicalDPI_y = widget->logicalDpiY();
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const double defaultDPI_x = qt_default_dpi_x();
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const double defaultDPI_y = qt_default_dpi_y();
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const int width = (logicalDPI_x / defaultDPI_x) * unscaledSize.width();
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const int height = (logicalDPI_y / defaultDPI_y) * unscaledSize.height();
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widget->resize(width, height);
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}
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QSize PDFWidgetUtils::scaleDPI(QPaintDevice* widget, QSize unscaledSize)
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{
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const double logicalDPI_x = widget->logicalDpiX();
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const double logicalDPI_y = widget->logicalDpiY();
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const double defaultDPI_x = qt_default_dpi_x();
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const double defaultDPI_y = qt_default_dpi_y();
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const int width = (logicalDPI_x / defaultDPI_x) * unscaledSize.width();
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const int height = (logicalDPI_y / defaultDPI_y) * unscaledSize.height();
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return QSize(width, height);
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}
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} // namespace pdf
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