X-Git-Url: https://git.carlh.net/gitweb/?a=blobdiff_plain;f=src%2Flib%2Frender_text.cc;h=3129c220f8f5f56ee5f7618e7df368f064bb439b;hb=dd9be86db6cde0afa5da0d1d1ac43b42e05dca26;hp=3fb67f100786e2bdae0cfcba50d62e549269a114;hpb=5e6c80eeda317edb2d782b44d5c6a2258ba3a14a;p=dcpomatic.git diff --git a/src/lib/render_text.cc b/src/lib/render_text.cc index 3fb67f100..3129c220f 100644 --- a/src/lib/render_text.cc +++ b/src/lib/render_text.cc @@ -24,10 +24,15 @@ #include "cross.h" #include "font.h" #include "dcpomatic_assert.h" +#include "warnings.h" +#include "util.h" #include #include #include +DCPOMATIC_DISABLE_WARNINGS #include +DCPOMATIC_ENABLE_WARNINGS +#include #ifndef DCPOMATIC_HAVE_SHOW_IN_CAIRO_CONTEXT #include #endif @@ -43,7 +48,7 @@ using std::max; using std::pair; using std::cerr; using std::make_pair; -using boost::shared_ptr; +using std::shared_ptr; using boost::optional; using boost::algorithm::replace_all; using namespace dcpomatic; @@ -90,10 +95,10 @@ set_source_rgba (Cairo::RefPtr context, dcp::Colour colour, floa static shared_ptr -create_image (int width, int height) +create_image (dcp::Size size) { /* 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 (width, height), false)); + shared_ptr image (new Image(AV_PIX_FMT_BGRA, size, false)); image->make_black (); return image; } @@ -135,19 +140,7 @@ setup_font (StringText const& subtitle, list > const& fonts) fc_config = FcInitLoadConfig (); } - optional font_file; - - try { - font_file = shared_path () / "LiberationSans-Regular.ttf"; - } catch (boost::filesystem::filesystem_error& e) { - - } - - /* Hack: try the debian/ubuntu locations if getting the shared path failed */ - - if (!font_file || !boost::filesystem::exists(*font_file)) { - font_file = "/usr/share/fonts/truetype/liberation/LiberationSans-Regular.ttf"; - } + optional font_file = default_font_file (); BOOST_FOREACH (shared_ptr i, fonts) { if (i->id() == subtitle.font() && i->file()) { @@ -200,68 +193,18 @@ setup_font (StringText const& subtitle, list > const& fonts) } -/** @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, DCPTime time, int frame_rate) +static float +calculate_fade_factor (StringText const& first, DCPTime time, int frame_rate) { - /* XXX: this method can only handle italic / bold changes mid-line, - nothing else yet. - */ - - DCPOMATIC_ASSERT (!subtitles.empty ()); - - /* 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; - - shared_ptr image = create_image (target.width, height); - Cairo::RefPtr surface = create_surface (image); - Cairo::RefPtr context = Cairo::Context::create (surface); - string const font_name = setup_font (subtitles.front(), fonts); - Glib::RefPtr layout = Pango::Layout::create (context); - - layout->set_alignment (Pango::ALIGN_LEFT); - - context->set_line_width (1); - - /* Compute fade factor */ float fade_factor = 1; /* 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 ()); + DCPTime const fade_in_start = DCPTime::from_seconds(first.in().as_seconds()).round(frame_rate); + DCPTime const fade_in_end = fade_in_start + DCPTime::from_seconds (first.fade_up_time().as_seconds ()); + DCPTime const fade_out_end = DCPTime::from_seconds (first.out().as_seconds()).round(frame_rate); + DCPTime const fade_out_start = fade_out_end - DCPTime::from_seconds (first.fade_down_time().as_seconds ()); 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(); @@ -273,74 +216,39 @@ render_line (list subtitles, list > fonts, dcp::Siz fade_factor = 0; } - /* Render the subtitle at the top left-hand corner of image */ - - 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 */ - 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 (); - } - - if (subtitles.front().effect() == dcp::BORDER) { - /* 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 + return fade_factor; +} - int layout_width; - int layout_height; - layout->get_pixel_size (layout_width, layout_height); - layout_width *= xscale; - layout_height *= yscale; +static int +x_position (StringText const& first, int target_width, int layout_width) +{ int x = 0; - switch (subtitles.front().h_align ()) { + switch (first.h_align ()) { case dcp::HALIGN_LEFT: /* h_position is distance between left of frame and left of subtitle */ - x = subtitles.front().h_position() * target.width; + x = first.h_position() * target_width; break; case dcp::HALIGN_CENTER: /* h_position is distance between centre of frame and centre of subtitle */ - x = (0.5 + subtitles.front().h_position()) * target.width - layout_width / 2; + x = (0.5 + first.h_position()) * target_width - layout_width / 2; break; case dcp::HALIGN_RIGHT: /* h_position is distance between right of frame and right of subtitle */ - x = (1.0 - subtitles.front().h_position()) * target.width - layout_width; + x = (1.0 - first.h_position()) * target_width - layout_width; break; } + return x; +} + + + +static int +y_position (StringText const& first, int target_height, int layout_height) +{ int y = 0; - switch (subtitles.front().v_align ()) { + switch (first.v_align ()) { case dcp::VALIGN_TOP: /* SMPTE says that v_position is the distance between top of frame and top of subtitle, but this doesn't always seem to be @@ -348,22 +256,146 @@ render_line (list subtitles, list > fonts, dcp::Siz to put VALIGN_TOP subs with v_position as the distance between top of frame and bottom of subtitle. */ - y = subtitles.front().v_position() * target.height - layout_height; + y = first.v_position() * target_height - layout_height; break; case dcp::VALIGN_CENTER: /* v_position is distance between centre of frame and centre of subtitle */ - y = (0.5 + subtitles.front().v_position()) * target.height - layout_height / 2; + y = (0.5 + first.v_position()) * target_height - layout_height / 2; break; case dcp::VALIGN_BOTTOM: /* v_position is distance between bottom of frame and bottom of subtitle */ - y = (1.0 - subtitles.front().v_position()) * target.height - layout_height; + y = (1.0 - first.v_position()) * target_height - layout_height; break; } - return PositionImage (image, Position (max (0, x), max (0, y))); + return y; +} + + +static void +setup_layout (Glib::RefPtr 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 +create_layout() +{ + PangoFontMap* c_font_map = pango_cairo_font_map_new (); + DCPOMATIC_ASSERT (c_font_map); + Glib::RefPtr font_map = Glib::wrap (c_font_map); + PangoContext* c_context = pango_font_map_create_context (c_font_map); + DCPOMATIC_ASSERT (c_context); + Glib::RefPtr 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. + */ +static PositionImage +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. + */ + + DCPOMATIC_ASSERT (!subtitles.empty ()); + StringText const& first = subtitles.front (); + + string const font_name = setup_font (first, fonts); + float const fade_factor = calculate_fade_factor (first, time, frame_rate); + string const markup = marked_up (subtitles, target.height, fade_factor); + Glib::RefPtr layout = create_layout (); + setup_layout (layout, font_name, markup); + dcp::Size size; + layout->get_pixel_size (size.width, size.height); + + /* Calculate x and y scale factors. These are only used to stretch + the font away from its normal aspect ratio. + */ + float x_scale = 1; + float y_scale = 1; + if (fabs (first.aspect_adjust() - 1.0) > dcp::ASPECT_ADJUST_EPSILON) { + if (first.aspect_adjust() < 1) { + x_scale = max (0.25f, first.aspect_adjust ()); + y_scale = 1; + } else { + x_scale = 1; + y_scale = 1 / min (4.0f, first.aspect_adjust ()); + } + } + + float const border_width = first.effect() == dcp::BORDER ? (first.outline_width * target.width / 2048.0) : 0; + size.width += 2 * ceil (border_width); + size.height += 2 * ceil (border_width); + + size.width *= x_scale; + size.height *= y_scale; + + /* Shuffle the subtitle over by the border width (if we have any) so it's not cut off */ + int const x_offset = ceil (border_width); + /* Move down a bit so that accents on capital letters can be seen */ + int const y_offset = target.height / 100.0; + + size.width += x_offset; + size.height += y_offset; + + shared_ptr image = create_image (size); + Cairo::RefPtr surface = create_surface (image); + Cairo::RefPtr context = Cairo::Context::create (surface); + + context->set_line_width (1); + context->scale (x_scale, y_scale); + layout->update_from_cairo_context (context); + + if (first.effect() == dcp::SHADOW) { + /* Drop-shadow effect */ + set_source_rgba (context, first.effect_colour(), fade_factor); + context->move_to (x_offset + 4, y_offset + 4); + layout->add_to_cairo_context (context); + context->fill (); + } + + if (first.effect() == dcp::BORDER) { + /* Border effect */ + set_source_rgba (context, first.effect_colour(), fade_factor); + context->set_line_width (border_width); + 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 */ + + set_source_rgba (context, first.colour(), fade_factor); + + context->move_to (x_offset, y_offset); + layout->add_to_cairo_context (context); + context->fill (); + + context->set_line_width (0.5); + context->move_to (x_offset, y_offset); + layout->add_to_cairo_context (context); + context->stroke (); + + int const x = x_position (first, target.width, size.width); + int const y = y_position (first, target.height, size.height); + return PositionImage (image, Position(max (0, x), max(0, y))); } + /** @param time Time of the frame that these subtitles are going on. + * @param target Size of the container that this subtitle will end up in. * @param frame_rate DCP frame rate. */ list