60 lines
1.6 KiB
C++
60 lines
1.6 KiB
C++
#include <mbgl/util/image.hpp>
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#include <QBuffer>
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#include <QByteArray>
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#include <QImage>
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namespace mbgl {
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std::string encodePNG(const PremultipliedImage& pre) {
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QImage image(pre.data.get(), pre.size.width, pre.size.height,
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QImage::Format_ARGB32_Premultiplied);
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QByteArray array;
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QBuffer buffer(&array);
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buffer.open(QIODevice::WriteOnly);
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image.rgbSwapped().save(&buffer, "PNG");
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return std::string(array.constData(), array.size());
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}
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#if !defined(QT_IMAGE_DECODERS)
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PremultipliedImage decodeJPEG(const uint8_t*, size_t);
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#endif
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PremultipliedImage decodeImage(const std::string& string) {
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const uint8_t* data = reinterpret_cast<const uint8_t*>(string.data());
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const size_t size = string.size();
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#if !defined(QT_IMAGE_DECODERS)
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if (size >= 2) {
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uint16_t magic = ((data[0] << 8) | data[1]) & 0xffff;
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if (magic == 0xFFD8) {
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return decodeJPEG(data, size);
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}
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}
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#endif
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QImage image =
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QImage::fromData(data, size)
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.rgbSwapped()
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.convertToFormat(QImage::Format_ARGB32_Premultiplied);
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if (image.isNull()) {
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throw std::runtime_error("Unsupported image type");
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}
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#if QT_VERSION >= 0x051000
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auto img = std::make_unique<uint8_t[]>(image.sizeInBytes());
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memcpy(img.get(), image.constBits(), image.sizeInBytes());
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#else
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auto img = std::make_unique<uint8_t[]>(image.byteCount());
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memcpy(img.get(), image.constBits(), image.byteCount());
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#endif
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return { { static_cast<uint32_t>(image.width()), static_cast<uint32_t>(image.height()) },
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std::move(img) };
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}
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}
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