static list<pair<boost::filesystem::path, string>> fc_config_fonts;
+/** Create a Pango layout using a dummy context which we can use to calculate the size
+ * of the text we will render. Then we can transfer the layout over to the real context
+ * for the actual render.
+ */
+static Glib::RefPtr<Pango::Layout>
+create_layout()
+{
+ auto c_font_map = pango_cairo_font_map_new ();
+ DCPOMATIC_ASSERT (c_font_map);
+ auto font_map = Glib::wrap (c_font_map);
+ auto c_context = pango_font_map_create_context (c_font_map);
+ DCPOMATIC_ASSERT (c_context);
+ auto context = Glib::wrap (c_context);
+ return Pango::Layout::create (context);
+}
+
+
+static void
+setup_layout (Glib::RefPtr<Pango::Layout> layout, string font_name, string markup)
+{
+ layout->set_alignment (Pango::ALIGN_LEFT);
+ Pango::FontDescription font (font_name);
+ layout->set_font_description (font);
+ layout->set_markup (markup);
+}
+
+
string
-marked_up (list<StringText> subtitles, int target_height, float fade_factor)
+marked_up (list<StringText> subtitles, int target_height, float fade_factor, string font_name)
{
- string out;
+ auto constexpr pixels_to_1024ths_point = 72 * 1024 / 96;
- for (auto const& i: subtitles) {
- out += "<span ";
- if (i.italic()) {
- out += "style=\"italic\" ";
+ auto make_span = [target_height, fade_factor](StringText const& subtitle, string text, string extra_attribute) {
+ string span;
+ span += "<span ";
+ if (subtitle.italic()) {
+ span += "style=\"italic\" ";
}
- if (i.bold()) {
- out += "weight=\"bold\" ";
+ if (subtitle.bold()) {
+ span += "weight=\"bold\" ";
}
- if (i.underline()) {
- out += "underline=\"single\" ";
+ if (subtitle.underline()) {
+ span += "underline=\"single\" ";
}
- out += "size=\"" + dcp::raw_convert<string>(i.size_in_pixels(target_height) * 72 * 1024 / 96) + "\" ";
+ span += "size=\"" + dcp::raw_convert<string>(subtitle.size_in_pixels(target_height) * pixels_to_1024ths_point) + "\" ";
/* Between 1-65535 inclusive, apparently... */
- out += "alpha=\"" + dcp::raw_convert<string>(int(floor(fade_factor * 65534)) + 1) + "\" ";
- out += "color=\"#" + i.colour().to_rgb_string() + "\">";
- out += i.text();
- out += "</span>";
+ span += "alpha=\"" + dcp::raw_convert<string>(int(floor(fade_factor * 65534)) + 1) + "\" ";
+ span += "color=\"#" + subtitle.colour().to_rgb_string() + "\"";
+ if (!extra_attribute.empty()) {
+ span += " " + extra_attribute;
+ }
+ span += ">";
+ span += text;
+ span += "</span>";
+ return span;
+ };
+
+ string out;
+ for (auto const& i: subtitles) {
+ if (std::abs(i.space_before()) > dcp::SPACE_BEFORE_EPSILON) {
+ /* We need to insert some horizontal space into the layout. The only way I can find to do this
+ * is to write a " " with some special letter_spacing. As far as I can see, such a space will
+ * be written with letter_spacing either side. This means that to get a horizontal space x we
+ * need to write a " " with letter spacing (x - s) / 2, where s is the width of the " ".
+ */
+ auto layout = create_layout();
+ setup_layout(layout, font_name, make_span(i, " ", {}));
+ int space_width;
+ int dummy;
+ layout->get_pixel_size(space_width, dummy);
+ auto spacing = ((i.space_before() * i.size_in_pixels(target_height) - space_width) / 2) * pixels_to_1024ths_point;
+ out += make_span(i, " ", "letter_spacing=\"" + dcp::raw_convert<string>(spacing) + "\"");
+ }
+
+ out += make_span(i, i.text(), {});
}
return out;
static shared_ptr<Image>
create_image (dcp::Size size)
{
- /* FFmpeg BGRA means first byte blue, second byte green, third byte red, fourth byte alpha */
+ /* 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);
image->make_black ();
return image;
static Cairo::RefPtr<Cairo::ImageSurface>
create_surface (shared_ptr<Image> image)
{
+ /* XXX: I don't think it's guaranteed that format_stride_for_width will return a stride without any padding,
+ * so it's lucky that this works.
+ */
+ DCPOMATIC_ASSERT (image->alignment() == Image::Alignment::COMPACT);
+ DCPOMATIC_ASSERT (image->pixel_format() == AV_PIX_FMT_BGRA);
return Cairo::ImageSurface::create (
image->data()[0],
Cairo::FORMAT_ARGB32,
}
-static void
-setup_layout (Glib::RefPtr<Pango::Layout> layout, string font_name, string markup)
-{
- layout->set_alignment (Pango::ALIGN_LEFT);
- Pango::FontDescription font (font_name);
- layout->set_font_description (font);
- layout->set_markup (markup);
-}
-
-
-/** Create a Pango layout using a dummy context which we can use to calculate the size
- * of the text we will render. Then we can transfer the layout over to the real context
- * for the actual render.
- */
-static Glib::RefPtr<Pango::Layout>
-create_layout()
-{
- auto c_font_map = pango_cairo_font_map_new ();
- DCPOMATIC_ASSERT (c_font_map);
- auto font_map = Glib::wrap (c_font_map);
- auto c_context = pango_font_map_create_context (c_font_map);
- DCPOMATIC_ASSERT (c_context);
- auto context = Glib::wrap (c_context);
- return Pango::Layout::create (context);
-}
-
-
/** @param subtitles A list of subtitles that are all on the same line,
* at the same time and with the same fade in/out.
*/
auto const font_name = setup_font (first, fonts);
auto const fade_factor = calculate_fade_factor (first, time, frame_rate);
- auto const markup = marked_up (subtitles, target.height, fade_factor);
+ auto const markup = marked_up (subtitles, target.height, fade_factor, font_name);
auto layout = create_layout ();
setup_layout (layout, font_name, markup);
dcp::Size size;
projects / dcpomatic.git / blobdiff