1 files changed, 68 insertions, 0 deletions
diff --git a/platform/qt/src/qt_image.cpp b/platform/qt/src/qt_image.cpp
new file mode 100644
index 0000000000..a5c92514c1
--- /dev/null
+++ b/platform/qt/src/qt_image.cpp
@@ -0,0 +1,68 @@
+#include <mbgl/util/image.hpp>
+
+#include <QBuffer>
+#include <QByteArray>
+#include <QImage>
+
+namespace mbgl {
+
+std::string encodePNG(const PremultipliedImage& pre) {
+    QImage image(pre.data.get(), pre.size.width, pre.size.height,
+        QImage::Format_ARGB32_Premultiplied);
+
+    QByteArray array;
+    QBuffer buffer(&array);
+
+    buffer.open(QIODevice::WriteOnly);
+    image.rgbSwapped().save(&buffer, "PNG");
+
+    return std::string(array.constData(), array.size());
+}
+
+#if !defined(QT_IMAGE_DECODERS)
+PremultipliedImage decodeJPEG(const uint8_t*, size_t);
+PremultipliedImage decodeWebP(const uint8_t*, size_t);
+#endif
+
+PremultipliedImage decodeImage(const std::string& string) {
+    const uint8_t* data = reinterpret_cast<const uint8_t*>(string.data());
+    const size_t size = string.size();
+
+#if !defined(QT_IMAGE_DECODERS)
+    if (size >= 12) {
+        uint32_t riff_magic = (data[0] << 24) | (data[1] << 16) | (data[2] << 8) | data[3];
+        uint32_t webp_magic = (data[8] << 24) | (data[9] << 16) | (data[10] << 8) | data[11];
+        if (riff_magic == 0x52494646 && webp_magic == 0x57454250) {
+            return decodeWebP(data, size);
+        }
+    }
+
+    if (size >= 2) {
+        uint16_t magic = ((data[0] << 8) | data[1]) & 0xffff;
+        if (magic == 0xFFD8) {
+            return decodeJPEG(data, size);
+        }
+    }
+#endif
+
+    QImage image =
+        QImage::fromData(data, size)
+        .rgbSwapped()
+        .convertToFormat(QImage::Format_ARGB32_Premultiplied);
+
+    if (image.isNull()) {
+        throw std::runtime_error("Unsupported image type");
+    }
+
+#if QT_VERSION >= 0x051000
+    auto img = std::make_unique<uint8_t[]>(image.sizeInBytes());
+    memcpy(img.get(), image.constBits(), image.sizeInBytes());
+#else
+    auto img = std::make_unique<uint8_t[]>(image.byteCount());
+    memcpy(img.get(), image.constBits(), image.byteCount());
+#endif
+
+    return { { static_cast<uint32_t>(image.width()), static_cast<uint32_t>(image.height()) },
+             std::move(img) };
+}
+}