64 lines
2.2 KiB
C++
64 lines
2.2 KiB
C++
#pragma once
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#include <qpixmap.h>
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namespace creeper {
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struct ContentScale {
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public:
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enum : uint8_t {
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NONE,
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FIT,
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CROP,
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FILL_WIDTH,
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FILL_HEIGHT,
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FILL_BOUNDS,
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INSIDE,
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} data;
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operator decltype(data)() const noexcept { return data; }
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auto transform(const QPixmap& pixmap, const QSize& size) const -> QPixmap {
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if (pixmap.isNull()) return {};
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auto image_size = QPointF(pixmap.width(), pixmap.height());
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auto target_width = static_cast<double>(size.width());
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auto target_height = static_cast<double>(size.height());
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constexpr auto mode = Qt::SmoothTransformation;
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switch (data) {
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case ContentScale::NONE: {
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return pixmap;
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}
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case ContentScale::FIT: {
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image_size *= target_width / image_size.x();
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if (image_size.y() > target_height) image_size *= target_height / image_size.y();
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return pixmap.scaled(image_size.x(), image_size.y(), Qt::IgnoreAspectRatio, mode);
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}
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case ContentScale::CROP: {
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image_size *= target_width / image_size.x();
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if (image_size.y() < target_height) image_size *= target_height / image_size.y();
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return pixmap.scaled(image_size.x(), image_size.y(), Qt::IgnoreAspectRatio, mode);
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}
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case ContentScale::INSIDE: {
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if (image_size.x() > target_width) image_size *= target_width / image_size.x();
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if (image_size.y() > target_height) image_size *= target_height / image_size.y();
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return pixmap.scaled(image_size.x(), image_size.y(), Qt::IgnoreAspectRatio, mode);
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}
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case ContentScale::FILL_BOUNDS: {
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return pixmap.scaled(size, Qt::IgnoreAspectRatio, mode);
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}
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case ContentScale::FILL_WIDTH:
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return pixmap.scaled(target_width, image_size.y() * target_width / image_size.x(),
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Qt::IgnoreAspectRatio, mode);
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case ContentScale::FILL_HEIGHT:
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return pixmap.scaled(image_size.x() * target_height / image_size.y(), target_height,
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Qt::IgnoreAspectRatio, mode);
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}
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return {};
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}
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};
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}
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