- /* Calculate x and y scale factors. These are only used to stretch
- the font away from its normal aspect ratio.
- */
- float xscale = 1;
- float yscale = 1;
- if (fabs (subtitles.front().aspect_adjust() - 1.0) > dcp::ASPECT_ADJUST_EPSILON) {
- if (subtitles.front().aspect_adjust() < 1) {
- xscale = max (0.25f, subtitles.front().aspect_adjust ());
- yscale = 1;
- } else {
- xscale = 1;
- yscale = 1 / min (4.0f, subtitles.front().aspect_adjust ());
- }
- }
-
- /* Make an empty bitmap as wide as target and at
- least tall enough for this subtitle.
- */
-
- int largest = 0;
- BOOST_FOREACH (dcp::SubtitleString const & i, subtitles) {
- largest = max (largest, i.size());
- }
- /* Basic guess on height... */
- int height = largest * target.height / (11 * 72);
- /* ...scaled... */
- height *= yscale;
- /* ...and add a bit more for luck */
- height += target.height / 11;
-
- /* FFmpeg BGRA means first byte blue, second byte green, third byte red, fourth byte alpha */
- shared_ptr<Image> image (new Image (AV_PIX_FMT_BGRA, dcp::Size (target.width, height), false));
+static shared_ptr<Image>
+create_image (dcp::Size size)
+{
+ /* FFmpeg BGRA means first byte blue, second byte green, third byte red, fourth byte alpha.
+ * This must be COMPACT as we're using it with Cairo::ImageSurface::create
+ */
+ auto image = make_shared<Image>(AV_PIX_FMT_BGRA, size, Image::Alignment::COMPACT);