afb81b8278
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51 lines
1.2 KiB
C++
51 lines
1.2 KiB
C++
// This file is part of Desktop App Toolkit,
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// a set of libraries for developing nice desktop applications.
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//
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// For license and copyright information please follow this link:
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// https://github.com/desktop-app/legal/blob/master/LEGAL
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//
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#pragma once
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#include <rpl/details/callable.h>
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#include <QtGui/QImage>
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#include <QtGui/QPainter>
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namespace dpr {
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// Validate(_cache, devicePixelRatioF(), size, [&](QPainter &p, QSize size) {
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// ... paint using p ...
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// }, (_cacheKey != cacheKey()), Qt::transparent);
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template <typename Generator>
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void Validate(
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QImage &image,
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double ratio,
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QSize size,
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Generator &&generator,
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bool force,
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std::optional<QColor> fill = {},
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bool setResultRatio = true) {
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size *= ratio;
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const auto sizeChanged = (image.size() != size);
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if (sizeChanged || force) {
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if (sizeChanged) {
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image = QImage(size, QImage::Format_ARGB32_Premultiplied);
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}
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if (fill) {
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image.fill(*fill);
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}
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image.setDevicePixelRatio(1.);
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auto p = QPainter(&image);
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using namespace rpl::details;
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if constexpr (is_callable_plain_v<Generator, QPainter&, QSize>) {
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generator(p, size);
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} else {
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generator(p);
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}
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}
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image.setDevicePixelRatio(setResultRatio ? ratio : 1.);
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}
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} // namespace dpr
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