I tried this, but all a get is a moree-pattern which indicates that somethings wrong with the interpretation of the data:
cairo_surface_t* plotSurface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 800, 800);
const char* buf = reinterpret_cast<const char*> (cairo_image_surface_get_data(surface));
unsigned long length = cairo_image_surface_get_stride(surface); // yields 3200
length *= cairo_image_surface_get_height(surface);
unsigned long length = cairo_image_surface_get_stride(surface); // yields 3200
length *= cairo_image_surface_get_height(surface);
PoDoFo::PdfImage img(this);
PoDoFo::PdfMemoryInputStream istream(buf, length);
img.SetImageData(800, 800, 8, &istream);
PoDoFo::PdfMemoryInputStream istream(buf, length);
img.SetImageData(800, 800, 8, &istream);
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