Image HTTP support

Uses Gio::File::load_contents (via URI::getContents) to load images from
non-file/non-data URIs. Depends on GVfs.

3 files changed, 36 insertions, 4 deletions

diff --git a/src/display/cairo-utils.cpp b/src/display/cairo-utils.cpp
index e4cef786d..516d52678 100644
--- a/src/display/cairo-utils.cpp
+++ b/src/display/cairo-utils.cpp
@@ -363,6 +363,31 @@ Pixbuf *Pixbuf::create_from_file(std::string const &fn, double svgdpi)
             std::cerr << "   (" << fn << ")" << std::endl;
             return nullptr;
         }
+
+        pb = Pixbuf::create_from_buffer(std::move(data), len, svgdpi, fn);
+
+        if (pb) {
+            pb->_mod_time = stdir.st_mtime;
+        }
+    } else {
+        std::cerr << "Pixbuf::create_from_file: failed to get contents: " << fn << std::endl;
+        return nullptr;
+    }
+
+    return pb;
+}
+
+Pixbuf *Pixbuf::create_from_buffer(std::string const &buffer, double svgdpi, std::string const &fn)
+{
+    auto datacopy = (gchar *)g_memdup(buffer.data(), buffer.size());
+    return Pixbuf::create_from_buffer(std::move(datacopy), buffer.size(), svgdpi, fn);
+}
+
+Pixbuf *Pixbuf::create_from_buffer(gchar *&&data, gsize len, double svgdpi, std::string const &fn)
+{
+    Pixbuf *pb = nullptr;
+    GError *error = nullptr;
+    {
         GdkPixbuf *buf = nullptr;
         GdkPixbufLoader *loader = nullptr;
         std::string::size_type idx;
@@ -432,7 +457,6 @@ Pixbuf *Pixbuf::create_from_file(std::string const &fn, double svgdpi)
         if (buf) {
             g_object_ref(buf);
             pb = new Pixbuf(buf);
-            pb->_mod_time = stdir.st_mtime;
             pb->_path = fn;
             if (!is_svg) {
                 GdkPixbufFormat *fmt = gdk_pixbuf_loader_get_format(loader);
@@ -450,9 +474,6 @@ Pixbuf *Pixbuf::create_from_file(std::string const &fn, double svgdpi)
 
         // TODO: we could also read DPI, ICC profile, gamma correction, and other information
         // from the file. This can be done by using format-specific libraries e.g. libpng.
-    } else {
-        std::cerr << "Pixbuf::create_from_file: failed to get contents: " << fn << std::endl;
-        return nullptr;
     }
 
     return pb;
diff --git a/src/display/cairo-utils.h b/src/display/cairo-utils.h
index ada78ce51..9c4c9b68b 100644
--- a/src/display/cairo-utils.h
+++ b/src/display/cairo-utils.h
@@ -119,8 +119,11 @@ public:
 
     static Pixbuf *create_from_data_uri(gchar const *uri, double svgdpi = 0);
     static Pixbuf *create_from_file(std::string const &fn, double svgddpi = 0);
+    static Pixbuf *create_from_buffer(std::string const &, double svgddpi = 0, std::string const &fn = "");
 
   private:
+    static Pixbuf *create_from_buffer(gchar *&&, gsize, double svgddpi = 0, std::string const &fn = "");
+
     void _ensurePixelsARGB32();
     void _ensurePixelsPixbuf();
     void _forceAlpha();
diff --git a/src/object/sp-image.cpp b/src/object/sp-image.cpp
index a66bb3625..ee0efc720 100644
--- a/src/object/sp-image.cpp
+++ b/src/object/sp-image.cpp
@@ -25,6 +25,7 @@
 #include <2geom/rect.h>
 #include <2geom/transforms.h>
 #include <glibmm/i18n.h>
+#include <giomm/error.h>
 
 #include "display/drawing-image.h"
 #include "display/cairo-utils.h"
@@ -590,6 +591,13 @@ Inkscape::Pixbuf *sp_image_repr_read_image(gchar const *href, gchar const *absre
             if (url.hasScheme("file")) {
                 auto native = url.toNativeFilename();
                 inkpb = Inkscape::Pixbuf::create_from_file(native.c_str(), svgdpi);
+            } else {
+                try {
+                    auto contents = url.getContents();
+                    inkpb = Inkscape::Pixbuf::create_from_buffer(contents, svgdpi);
+                } catch (const Gio::Error &e) {
+                    g_warning("URI::getContents failed for '%.100s'", href);
+                }
             }
         }