53 lines
1.5 KiB
C++
53 lines
1.5 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.width, pre.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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PremultipliedImage decodeWebP(const uint8_t*, size_t);
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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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// FIXME: Use Qt WebP decoder plugin.
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if (size >= 12) {
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uint32_t riff_magic = (data[0] << 24) | (data[1] << 16) | (data[2] << 8) | data[3];
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uint32_t webp_magic = (data[8] << 24) | (data[9] << 16) | (data[10] << 8) | data[11];
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if (riff_magic == 0x52494646 && webp_magic == 0x57454250) {
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return decodeWebP(data, size);
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}
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}
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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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auto img = std::make_unique<uint8_t[]>(image.byteCount());
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memcpy(img.get(), image.constBits(), image.byteCount());
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return { size_t(image.width()), size_t(image.height()), std::move(img) };
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}
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}
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