2 Copyright (C) 2014-2016 Carl Hetherington <cth@carlh.net>
4 This file is part of DCP-o-matic.
6 DCP-o-matic is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 DCP-o-matic is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
21 #include "render_subtitles.h"
26 #include "dcpomatic_assert.h"
27 #include <dcp/raw_convert.h>
28 #include <fontconfig/fontconfig.h>
29 #include <cairomm/cairomm.h>
31 #include <boost/foreach.hpp>
42 using boost::shared_ptr;
43 using boost::optional;
45 static FcConfig* fc_config = 0;
46 static list<pair<FontFiles, string> > fc_config_fonts;
49 marked_up (list<SubtitleString> subtitles, int target_height)
53 BOOST_FOREACH (SubtitleString const & i, subtitles) {
56 out += "style=\"italic\" ";
59 out += "weight=\"bold\" ";
62 out += "underline=\"single\" ";
64 out += "size=\"" + dcp::raw_convert<string>(i.size_in_pixels(target_height) * 72 * 1024 / 96) + "\" ";
65 out += "color=\"#" + i.colour().to_rgb_string() + "\">";
73 /** @param subtitles A list of subtitles that are all on the same line,
74 * at the same time and with the same fade in/out.
77 render_line (list<SubtitleString> subtitles, list<shared_ptr<Font> > fonts, dcp::Size target, DCPTime time)
79 /* XXX: this method can only handle italic / bold changes mid-line,
83 DCPOMATIC_ASSERT (!subtitles.empty ());
85 /* Calculate x and y scale factors. These are only used to stretch
86 the font away from its normal aspect ratio.
90 if (fabs (subtitles.front().aspect_adjust() - 1.0) > dcp::ASPECT_ADJUST_EPSILON) {
91 if (subtitles.front().aspect_adjust() < 1) {
92 xscale = max (0.25f, subtitles.front().aspect_adjust ());
96 yscale = 1 / min (4.0f, subtitles.front().aspect_adjust ());
100 /* Make an empty bitmap as wide as target and at
101 least tall enough for this subtitle.
105 BOOST_FOREACH (dcp::SubtitleString const & i, subtitles) {
106 largest = max (largest, i.size());
108 /* Basic guess on height... */
109 int height = largest * target.height / (11 * 72);
112 /* ...and add a bit more for luck */
113 height += target.height / 11;
115 shared_ptr<Image> image (new Image (AV_PIX_FMT_RGBA, dcp::Size (target.width, height), false));
116 image->make_black ();
118 #ifdef DCPOMATIC_HAVE_FORMAT_STRIDE_FOR_WIDTH
119 Cairo::RefPtr<Cairo::ImageSurface> surface = Cairo::ImageSurface::create (
121 Cairo::FORMAT_ARGB32,
123 image->size().height,
124 Cairo::ImageSurface::format_stride_for_width (Cairo::FORMAT_ARGB32, image->size().width)
127 /* Centos 5 does not have Cairo::ImageSurface::format_stride_for_width, so just use width * 4
128 which I hope is safe (if slow)
130 Cairo::RefPtr<Cairo::ImageSurface> surface = Cairo::ImageSurface::create (
132 Cairo::FORMAT_ARGB32,
134 image->size().height,
135 image->size().width * 4
139 Cairo::RefPtr<Cairo::Context> context = Cairo::Context::create (surface);
142 fc_config = FcConfigCreate ();
145 FontFiles font_files;
148 font_files.set (FontFiles::NORMAL, shared_path () / "LiberationSans-Regular.ttf");
149 font_files.set (FontFiles::ITALIC, shared_path () / "LiberationSans-Italic.ttf");
150 font_files.set (FontFiles::BOLD, shared_path () / "LiberationSans-Bold.ttf");
151 } catch (boost::filesystem::filesystem_error& e) {
155 /* Hack: try the debian/ubuntu locations if getting the shared path failed */
157 if (!font_files.get(FontFiles::NORMAL) || !boost::filesystem::exists(font_files.get(FontFiles::NORMAL).get())) {
158 font_files.set (FontFiles::NORMAL, "/usr/share/fonts/truetype/liberation/LiberationSans-Regular.ttf");
160 if (!font_files.get(FontFiles::ITALIC) || !boost::filesystem::exists(font_files.get(FontFiles::ITALIC).get())) {
161 font_files.set (FontFiles::ITALIC, "/usr/share/fonts/truetype/liberation/LiberationSans-Italic.ttf");
163 if (!font_files.get(FontFiles::BOLD) || !boost::filesystem::exists(font_files.get(FontFiles::BOLD).get())) {
164 font_files.set (FontFiles::BOLD, "/usr/share/fonts/truetype/liberation/LiberationSans-Bold.ttf");
167 BOOST_FOREACH (shared_ptr<Font> i, fonts) {
168 if (i->id() == subtitles.front().font() && i->file(FontFiles::NORMAL)) {
169 font_files = i->files ();
173 list<pair<FontFiles, string> >::const_iterator existing = fc_config_fonts.begin ();
174 while (existing != fc_config_fonts.end() && existing->first != font_files) {
179 if (existing != fc_config_fonts.end ()) {
180 font_name = existing->second;
182 /* Make this font available to DCP-o-matic */
183 for (int i = 0; i < FontFiles::VARIANTS; ++i) {
184 if (font_files.get(static_cast<FontFiles::Variant>(i))) {
185 FcConfigAppFontAddFile (
187 reinterpret_cast<FcChar8 const *> (font_files.get(static_cast<FontFiles::Variant>(i)).get().string().c_str())
192 FcPattern* pattern = FcPatternBuild (
193 0, FC_FILE, FcTypeString, font_files.get(FontFiles::NORMAL).get().string().c_str(), static_cast<char *> (0)
195 FcObjectSet* object_set = FcObjectSetBuild (FC_FAMILY, FC_STYLE, FC_LANG, FC_FILE, static_cast<char *> (0));
196 FcFontSet* font_set = FcFontList (fc_config, pattern, object_set);
198 for (int i = 0; i < font_set->nfont; ++i) {
199 FcPattern* font = font_set->fonts[i];
204 FcPatternGetString (font, FC_FILE, 0, &file) == FcResultMatch &&
205 FcPatternGetString (font, FC_FAMILY, 0, &family) == FcResultMatch &&
206 FcPatternGetString (font, FC_STYLE, 0, &style) == FcResultMatch
208 font_name = reinterpret_cast<char const *> (family);
212 FcFontSetDestroy (font_set);
215 FcObjectSetDestroy (object_set);
216 FcPatternDestroy (pattern);
218 fc_config_fonts.push_back (make_pair (font_files, font_name));
221 FcConfigSetCurrent (fc_config);
223 Glib::RefPtr<Pango::Layout> layout = Pango::Layout::create (context);
225 layout->set_alignment (Pango::ALIGN_LEFT);
227 context->set_line_width (1);
229 /* Render the subtitle at the top left-hand corner of image */
231 Pango::FontDescription font (font_name);
232 layout->set_font_description (font);
233 layout->set_markup (marked_up (subtitles, target.height));
235 /* Compute fade factor */
236 float fade_factor = 1;
238 DCPTime const fade_in_start = DCPTime::from_seconds (subtitles.front().in().as_seconds ());
239 DCPTime const fade_in_end = fade_in_start + DCPTime::from_seconds (subtitles.front().fade_up_time().as_seconds ());
240 DCPTime const fade_out_end = DCPTime::from_seconds (subtitles.front().out().as_seconds ());
241 DCPTime const fade_out_start = fade_out_end - DCPTime::from_seconds (subtitles.front().fade_down_time().as_seconds ());
242 if (fade_in_start <= time && time <= fade_in_end && fade_in_start != fade_in_end) {
243 fade_factor = DCPTime(time - fade_in_start).seconds() / DCPTime(fade_in_end - fade_in_start).seconds();
244 } else if (fade_out_start <= time && time <= fade_out_end && fade_out_start != fade_out_end) {
245 fade_factor = 1 - DCPTime(time - fade_out_start).seconds() / DCPTime(fade_out_end - fade_out_start).seconds();
246 } else if (time < fade_in_start || time > fade_out_end) {
250 context->scale (xscale, yscale);
251 layout->update_from_cairo_context (context);
253 /* Shuffle the subtitle over very slightly if it has a border so that the left-hand
254 side of the first character's border is not cut off.
256 int const x_offset = subtitles.front().effect() == dcp::BORDER ? (target.width / 600.0) : 0;
257 /* Move down a bit so that accents on capital letters can be seen */
258 int const y_offset = target.height / 100.0;
260 if (subtitles.front().effect() == dcp::SHADOW) {
261 /* Drop-shadow effect */
262 dcp::Colour const ec = subtitles.front().effect_colour ();
263 context->set_source_rgba (float(ec.r) / 255, float(ec.g) / 255, float(ec.b) / 255, fade_factor);
264 context->move_to (x_offset + 4, y_offset + 4);
265 layout->add_to_cairo_context (context);
269 if (subtitles.front().effect() == dcp::BORDER) {
270 /* Border effect; stroke the subtitle with a large (arbitrarily chosen) line width */
271 dcp::Colour ec = subtitles.front().effect_colour ();
272 context->set_source_rgba (float(ec.r) / 255, float(ec.g) / 255, float(ec.b) / 255, fade_factor);
273 context->set_line_width (subtitles.front().outline_width * target.width / 2048.0);
274 context->set_line_join (Cairo::LINE_JOIN_ROUND);
275 context->move_to (x_offset, y_offset);
276 layout->add_to_cairo_context (context);
280 /* The actual subtitle */
282 context->set_line_width (0);
283 context->move_to (x_offset, y_offset);
284 layout->show_in_cairo_context (context);
288 layout->get_pixel_size (layout_width, layout_height);
289 layout_width *= xscale;
290 layout_height *= yscale;
293 switch (subtitles.front().h_align ()) {
294 case dcp::HALIGN_LEFT:
295 /* h_position is distance between left of frame and left of subtitle */
296 x = subtitles.front().h_position() * target.width;
298 case dcp::HALIGN_CENTER:
299 /* h_position is distance between centre of frame and centre of subtitle */
300 x = (0.5 + subtitles.front().h_position()) * target.width - layout_width / 2;
302 case dcp::HALIGN_RIGHT:
303 /* h_position is distance between right of frame and right of subtitle */
304 x = (1.0 - subtitles.front().h_position()) * target.width - layout_width;
309 switch (subtitles.front().v_align ()) {
310 case dcp::VALIGN_TOP:
311 /* SMPTE says that v_position is the distance between top
312 of frame and top of subtitle, but this doesn't always seem to be
313 the case in practice; Gunnar Ásgeirsson's Dolby server appears
314 to put VALIGN_TOP subs with v_position as the distance between top
315 of frame and bottom of subtitle.
317 y = subtitles.front().v_position() * target.height - layout_height;
319 case dcp::VALIGN_CENTER:
320 /* v_position is distance between centre of frame and centre of subtitle */
321 y = (0.5 + subtitles.front().v_position()) * target.height - layout_height / 2;
323 case dcp::VALIGN_BOTTOM:
324 /* v_position is distance between bottom of frame and bottom of subtitle */
325 y = (1.0 - subtitles.front().v_position()) * target.height - layout_height;
329 return PositionImage (image, Position<int> (max (0, x), max (0, y)));
332 /** @param time Time of the frame that these subtitles are going on */
334 render_subtitles (list<SubtitleString> subtitles, list<shared_ptr<Font> > fonts, dcp::Size target, DCPTime time)
336 list<SubtitleString> pending;
337 list<PositionImage> images;
339 BOOST_FOREACH (SubtitleString const & i, subtitles) {
340 if (!pending.empty() && fabs (i.v_position() - pending.back().v_position()) > 1e-4) {
341 images.push_back (render_line (pending, fonts, target, time));
344 pending.push_back (i);
347 if (!pending.empty ()) {
348 images.push_back (render_line (pending, fonts, target, time));