X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;f=src%2Flib%2Frender_subtitles.cc;h=5f587c3137504c759df8ba29306e4e0b99fb0926;hb=dc87773c69beb0249c1d50841730a10a496b563a;hp=76aa092297d9c880a6a5949f78354d953e249e93;hpb=2ddb0b6bf8087cb1ef3ad3a3a185c55e406c07bb;p=dcpomatic.git diff --git a/src/lib/render_subtitles.cc b/src/lib/render_subtitles.cc index 76aa09229..5f587c313 100644 --- a/src/lib/render_subtitles.cc +++ b/src/lib/render_subtitles.cc @@ -24,9 +24,13 @@ #include "cross.h" #include "font.h" #include "dcpomatic_assert.h" +#include #include #include #include +#ifndef DCPOMATIC_HAVE_SHOW_IN_CAIRO_CONTEXT +#include +#endif #include #include @@ -44,9 +48,44 @@ using boost::optional; static FcConfig* fc_config = 0; static list > fc_config_fonts; -/** @param subtitles A list of subtitles that are all on the same line */ +string +marked_up (list subtitles, int target_height, float fade_factor) +{ + string out; + + BOOST_FOREACH (SubtitleString const & i, subtitles) { + out += "(i.size_in_pixels(target_height) * 72 * 1024 / 96) + "\" "; + /* Between 1-65535 inclusive, apparently... */ + out += "alpha=\"" + dcp::raw_convert(int(floor(fade_factor * 65534)) + 1) + "\" "; + out += "color=\"#" + i.colour().to_rgb_string() + "\">"; + out += i.text (); + out += ""; + } + + return out; +} + +static void +set_source_rgba (Cairo::RefPtr context, dcp::Colour colour, float fade_factor) +{ + context->set_source_rgba (float(colour.r) / 255, float(colour.g) / 255, float(colour.b) / 255, fade_factor); +} + +/** @param subtitles A list of subtitles that are all on the same line, + * at the same time and with the same fade in/out. + */ static PositionImage -render_line (list subtitles, list > fonts, dcp::Size target) +render_line (list subtitles, list > fonts, dcp::Size target, DCPTime time, int frame_rate) { /* XXX: this method can only handle italic / bold changes mid-line, nothing else yet. @@ -73,14 +112,19 @@ render_line (list subtitles, list > fonts, 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 = subtitles.front().size() * target.height / (11 * 72); + int height = largest * target.height / (11 * 72); /* ...scaled... */ height *= yscale; /* ...and add a bit more for luck */ height += target.height / 11; - shared_ptr image (new Image (AV_PIX_FMT_RGBA, dcp::Size (target.width, height), false)); + /* FFmpeg BGRA means first byte blue, second byte green, third byte red, fourth byte alpha */ + shared_ptr image (new Image (AV_PIX_FMT_BGRA, dcp::Size (target.width, height), false)); image->make_black (); #ifdef DCPOMATIC_HAVE_FORMAT_STRIDE_FOR_WIDTH @@ -89,6 +133,7 @@ render_line (list subtitles, list > fonts, Cairo::FORMAT_ARGB32, image->size().width, image->size().height, + /* Cairo ARGB32 means first byte blue, second byte green, third byte red, fourth byte alpha */ Cairo::ImageSurface::format_stride_for_width (Cairo::FORMAT_ARGB32, image->size().width) ); #else @@ -157,7 +202,9 @@ render_line (list subtitles, list > fonts, } } - FcPattern* pattern = FcPatternBuild (0, FC_FILE, FcTypeString, font_files.get(FontFiles::NORMAL).get().string().c_str(), static_cast (0)); + FcPattern* pattern = FcPatternBuild ( + 0, FC_FILE, FcTypeString, font_files.get(FontFiles::NORMAL).get().string().c_str(), static_cast (0) + ); FcObjectSet* object_set = FcObjectSetBuild (FC_FAMILY, FC_STYLE, FC_LANG, FC_FILE, static_cast (0)); FcFontSet* font_set = FcFontList (fc_config, pattern, object_set); if (font_set) { @@ -192,80 +239,71 @@ render_line (list subtitles, list > fonts, context->set_line_width (1); - /* Render the subtitle at the top left-hand corner of image */ - - Pango::FontDescription font (font_name); - font.set_absolute_size (subtitles.front().size_in_pixels (target.height) * PANGO_SCALE); - layout->set_font_description (font); - - string marked_up; - bool italic = false; - bool bold = false; - BOOST_FOREACH (dcp::SubtitleString const & i, subtitles) { - if (i.italic() != italic) { - if (i.italic()) { - marked_up += ""; - } else { - marked_up += ""; - } - italic = i.italic (); - } + /* Compute fade factor */ + float fade_factor = 1; - if (i.bold() != bold) { - if (i.bold()) { - marked_up += ""; - } else { - marked_up += ""; - } - bold = i.bold (); - } + /* Round the fade start/end to the nearest frame start. Otherwise if a subtitle starts just after + the start of a frame it will be faded out. + */ + DCPTime const fade_in_start = DCPTime::from_seconds(subtitles.front().in().as_seconds()).round(frame_rate); + DCPTime const fade_in_end = fade_in_start + DCPTime::from_seconds (subtitles.front().fade_up_time().as_seconds ()); + DCPTime const fade_out_end = DCPTime::from_seconds (subtitles.front().out().as_seconds()).round(frame_rate); + DCPTime const fade_out_start = fade_out_end - DCPTime::from_seconds (subtitles.front().fade_down_time().as_seconds ()); - marked_up += i.text (); + if (fade_in_start <= time && time <= fade_in_end && fade_in_start != fade_in_end) { + fade_factor *= DCPTime(time - fade_in_start).seconds() / DCPTime(fade_in_end - fade_in_start).seconds(); } - - if (italic) { - marked_up += ""; + if (fade_out_start <= time && time <= fade_out_end && fade_out_start != fade_out_end) { + fade_factor *= 1 - DCPTime(time - fade_out_start).seconds() / DCPTime(fade_out_end - fade_out_start).seconds(); } - - if (bold) { - marked_up += ""; + if (time < fade_in_start || time > fade_out_end) { + fade_factor = 0; } - layout->set_markup (marked_up); + /* Render the subtitle at the top left-hand corner of image */ - /* Compute fade factor */ - /* XXX */ - float fade_factor = 1; + Pango::FontDescription font (font_name); + layout->set_font_description (font); + layout->set_markup (marked_up (subtitles, target.height, fade_factor)); context->scale (xscale, yscale); layout->update_from_cairo_context (context); + /* Shuffle the subtitle over very slightly if it has a border so that the left-hand + side of the first character's border is not cut off. + */ + int const x_offset = subtitles.front().effect() == dcp::BORDER ? (target.width / 600.0) : 0; + /* Move down a bit so that accents on capital letters can be seen */ + int const y_offset = target.height / 100.0; + if (subtitles.front().effect() == dcp::SHADOW) { /* Drop-shadow effect */ - dcp::Colour const ec = subtitles.front().effect_colour (); - context->set_source_rgba (float(ec.r) / 255, float(ec.g) / 255, float(ec.b) / 255, fade_factor); - context->move_to (4, 4); + set_source_rgba (context, subtitles.front().effect_colour(), fade_factor); + context->move_to (x_offset + 4, y_offset + 4); layout->add_to_cairo_context (context); context->fill (); } - /* The actual subtitle */ - - dcp::Colour const c = subtitles.front().colour (); - context->set_source_rgba (float(c.r) / 255, float(c.g) / 255, float(c.b) / 255, fade_factor); - context->move_to (0, 0); - layout->add_to_cairo_context (context); - context->fill (); - if (subtitles.front().effect() == dcp::BORDER) { - /* Border effect */ - dcp::Colour ec = subtitles.front().effect_colour (); - context->set_source_rgba (float(ec.r) / 255, float(ec.g) / 255, float(ec.b) / 255, fade_factor); - context->move_to (0, 0); + /* Border effect; stroke the subtitle with a large (arbitrarily chosen) line width */ + set_source_rgba (context, subtitles.front().effect_colour(), fade_factor); + context->set_line_width (subtitles.front().outline_width * target.width / 2048.0); + context->set_line_join (Cairo::LINE_JOIN_ROUND); + context->move_to (x_offset, y_offset); layout->add_to_cairo_context (context); context->stroke (); } + /* The actual subtitle */ + + context->set_line_width (0); + context->move_to (x_offset, y_offset); +#ifdef DCPOMATIC_HAVE_SHOW_IN_CAIRO_CONTEXT + layout->show_in_cairo_context (context); +#else + pango_cairo_show_layout (context->cobj(), layout->gobj()); +#endif + int layout_width; int layout_height; layout->get_pixel_size (layout_width, layout_height); @@ -312,22 +350,25 @@ render_line (list subtitles, list > fonts, return PositionImage (image, Position (max (0, x), max (0, y))); } +/** @param time Time of the frame that these subtitles are going on. + * @param frame_rate DCP frame rate. + */ list -render_subtitles (list subtitles, list > fonts, dcp::Size target) +render_subtitles (list subtitles, list > fonts, dcp::Size target, DCPTime time, int frame_rate) { - list pending; + list pending; list images; - BOOST_FOREACH (dcp::SubtitleString const & i, subtitles) { + BOOST_FOREACH (SubtitleString const & i, subtitles) { if (!pending.empty() && fabs (i.v_position() - pending.back().v_position()) > 1e-4) { - images.push_back (render_line (pending, fonts, target)); + images.push_back (render_line (pending, fonts, target, time, frame_rate)); pending.clear (); } pending.push_back (i); } if (!pending.empty ()) { - images.push_back (render_line (pending, fonts, target)); + images.push_back (render_line (pending, fonts, target, time, frame_rate)); } return images;