X-Git-Url: https://main.carlh.net/gitweb/?p=dcpomatic.git;a=blobdiff_plain;f=src%2Flib%2Frender_text.cc;h=8d5f8e6a94892170ce28903af6a47b9c3f1862a0;hp=7ae7d91524ddd3d6a03b2eb90cac8d4f8507172f;hb=HEAD;hpb=d702ba9f67da8a08277f83ec692bf6b90736b243 diff --git a/src/lib/render_text.cc b/src/lib/render_text.cc index 7ae7d9152..870f3045d 100644 --- a/src/lib/render_text.cc +++ b/src/lib/render_text.cc @@ -1,5 +1,5 @@ /* - Copyright (C) 2014-2016 Carl Hetherington + Copyright (C) 2014-2021 Carl Hetherington This file is part of DCP-o-matic. @@ -18,123 +18,150 @@ */ -#include "render_text.h" -#include "types.h" -#include "image.h" + #include "cross.h" -#include "font.h" #include "dcpomatic_assert.h" +#include "font.h" +#include "font_config.h" +#include "image.h" +#include "render_text.h" +#include "util.h" #include -#include +#include #include +LIBDCP_DISABLE_WARNINGS #include -#ifndef DCPOMATIC_HAVE_SHOW_IN_CAIRO_CONTEXT +LIBDCP_ENABLE_WARNINGS #include -#endif -#include #include #include -using std::list; + +using std::cerr; using std::cout; -using std::string; -using std::min; +using std::make_pair; +using std::make_shared; using std::max; +using std::min; using std::pair; -using std::cerr; -using std::make_pair; -using boost::shared_ptr; +using std::shared_ptr; +using std::string; +using std::vector; using boost::optional; -using boost::algorithm::replace_all; +using namespace dcpomatic; + + +/** 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(string font_name, string markup) +{ + 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); + auto layout = Pango::Layout::create(context); + + layout->set_alignment (Pango::ALIGN_LEFT); + Pango::FontDescription font (font_name); + layout->set_font_description (font); + layout->set_markup (markup); + + return layout; +} -static FcConfig* fc_config = 0; -static list > fc_config_fonts; string -marked_up (list subtitles, int target_height, float fade_factor) +marked_up(vector subtitles, int target_height, float fade_factor, string font_name) { - string out; + auto constexpr pixels_to_1024ths_point = 72 * 1024 / 96; - BOOST_FOREACH (StringText const & i, subtitles) { - out += "(i.size_in_pixels(target_height) * 72 * 1024 / 96) + "\" "; + span += "size=\"" + dcp::raw_convert(lrintf(subtitle.size_in_pixels(target_height) * pixels_to_1024ths_point)) + "\" "; /* Between 1-65535 inclusive, apparently... */ - out += "alpha=\"" + dcp::raw_convert(int(floor(fade_factor * 65534)) + 1) + "\" "; - out += "color=\"#" + i.colour().to_rgb_string() + "\">"; + span += "alpha=\"" + dcp::raw_convert(int(floor(fade_factor * 65534)) + 1) + "\" "; + span += "color=\"#" + subtitle.colour().to_rgb_string() + "\""; + if (!extra_attribute.empty()) { + span += " " + extra_attribute; + } + span += ">"; - string t = i.text(); - replace_all(t, "&", "&"); - out += t; + boost::algorithm::replace_all(text, "&", "&"); + boost::algorithm::replace_all(text, "<", "<"); + boost::algorithm::replace_all(text, ">", ">"); + boost::algorithm::replace_all(text, "\n", ""); + + span += text; + 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(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(spacing) + "\""); + } - out += ""; + out += make_span(i, i.text(), {}); } 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, 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; - - /* 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)); +static shared_ptr +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(AV_PIX_FMT_BGRA, size, Image::Alignment::COMPACT); image->make_black (); + return image; +} + -#ifdef DCPOMATIC_HAVE_FORMAT_STRIDE_FOR_WIDTH - Cairo::RefPtr surface = Cairo::ImageSurface::create ( +static Cairo::RefPtr +create_surface (shared_ptr 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, image->size().width, @@ -142,240 +169,375 @@ render_line (list subtitles, list > fonts, dcp::Siz /* 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 - /* Centos 5 does not have Cairo::ImageSurface::format_stride_for_width, so just use width * 4 - which I hope is safe (if slow) - */ - Cairo::RefPtr surface = Cairo::ImageSurface::create ( - image->data()[0], - Cairo::FORMAT_ARGB32, - image->size().width, - image->size().height, - image->size().width * 4 - ); -#endif - - Cairo::RefPtr context = Cairo::Context::create (surface); +} - if (!fc_config) { - fc_config = FcConfigCreate (); - } - FontFiles font_files; +static float +calculate_fade_factor (StringText const& first, DCPTime time, int frame_rate) +{ + float fade_factor = 1; - try { - font_files.set (FontFiles::NORMAL, shared_path () / "LiberationSans-Regular.ttf"); - font_files.set (FontFiles::ITALIC, shared_path () / "LiberationSans-Italic.ttf"); - font_files.set (FontFiles::BOLD, shared_path () / "LiberationSans-Bold.ttf"); - } catch (boost::filesystem::filesystem_error& e) { + /* 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. + */ + auto const fade_in_start = DCPTime::from_seconds(first.in().as_seconds()).round(frame_rate); + auto const fade_in_end = fade_in_start + DCPTime::from_seconds (first.fade_up_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(); } - /* Hack: try the debian/ubuntu locations if getting the shared path failed */ - - if (!font_files.get(FontFiles::NORMAL) || !boost::filesystem::exists(font_files.get(FontFiles::NORMAL).get())) { - font_files.set (FontFiles::NORMAL, "/usr/share/fonts/truetype/liberation/LiberationSans-Regular.ttf"); - } - if (!font_files.get(FontFiles::ITALIC) || !boost::filesystem::exists(font_files.get(FontFiles::ITALIC).get())) { - font_files.set (FontFiles::ITALIC, "/usr/share/fonts/truetype/liberation/LiberationSans-Italic.ttf"); - } - if (!font_files.get(FontFiles::BOLD) || !boost::filesystem::exists(font_files.get(FontFiles::BOLD).get())) { - font_files.set (FontFiles::BOLD, "/usr/share/fonts/truetype/liberation/LiberationSans-Bold.ttf"); + if (time < fade_in_start) { + fade_factor = 0; } - BOOST_FOREACH (shared_ptr i, fonts) { - if (i->id() == subtitles.front().font() && i->file(FontFiles::NORMAL)) { - font_files = i->files (); + /* first.out() may be zero if we don't know when this subtitle will finish. We can only think about + * fading out if we _do_ know when it will finish. + */ + if (first.out() != dcp::Time()) { + auto const fade_out_end = DCPTime::from_seconds (first.out().as_seconds()).round(frame_rate); + auto const fade_out_start = fade_out_end - DCPTime::from_seconds(first.fade_down_time().as_seconds()); + + 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 (time > fade_out_end) { + fade_factor = 0; } } - list >::const_iterator existing = fc_config_fonts.begin (); - while (existing != fc_config_fonts.end() && existing->first != font_files) { - ++existing; + return fade_factor; +} + + +static int +x_position(dcp::HAlign align, float position, int target_width, int layout_width) +{ + int x = 0; + switch (align) { + case dcp::HAlign::LEFT: + /* h_position is distance between left of frame and left of subtitle */ + x = position * target_width; + break; + case dcp::HAlign::CENTER: + /* h_position is distance between centre of frame and centre of subtitle */ + x = (0.5 + 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 - position) * target_width - layout_width; + break; } - string font_name; - if (existing != fc_config_fonts.end ()) { - font_name = existing->second; - } else { - /* Make this font available to DCP-o-matic */ - for (int i = 0; i < FontFiles::VARIANTS; ++i) { - if (font_files.get(static_cast(i))) { - FcConfigAppFontAddFile ( - fc_config, - reinterpret_cast (font_files.get(static_cast(i)).get().string().c_str()) - ); - } - } + return x; +} - 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) { - for (int i = 0; i < font_set->nfont; ++i) { - FcPattern* font = font_set->fonts[i]; - FcChar8* file; - FcChar8* family; - FcChar8* style; - if ( - FcPatternGetString (font, FC_FILE, 0, &file) == FcResultMatch && - FcPatternGetString (font, FC_FAMILY, 0, &family) == FcResultMatch && - FcPatternGetString (font, FC_STYLE, 0, &style) == FcResultMatch - ) { - font_name = reinterpret_cast (family); - } - } - FcFontSetDestroy (font_set); +/** @param align_standard Standard with which to interpret this subtitle's position. + * @param align alignment. + * @param position position (between 0 and 1) + * @param target_height Height of the target screen (in pixels). + * @param baseline_to_bottom Distance from text baseline to the bottom of the bounding box (in pixels). + * @param layout_height Height of the subtitle bounding box (in pixels). + * @return y position of the top of the subtitle bounding box (in pixels) from the top of the screen. + */ +static int +y_position(dcp::SubtitleStandard standard, dcp::VAlign align, float position, int target_height, int baseline_to_bottom, int layout_height) +{ + int y = 0; + switch (standard) { + case dcp::SubtitleStandard::INTEROP: + case dcp::SubtitleStandard::SMPTE_2014: + switch (align) { + case dcp::VAlign::TOP: + /* position is distance from top of frame to subtitle baseline */ + y = position * target_height - (layout_height - baseline_to_bottom); + break; + case dcp::VAlign::CENTER: + /* position is distance from centre of frame to subtitle baseline */ + y = (0.5 + position) * target_height - (layout_height - baseline_to_bottom); + break; + case dcp::VAlign::BOTTOM: + /* position is distance from bottom of frame to subtitle baseline */ + y = (1.0 - position) * target_height - (layout_height - baseline_to_bottom); + break; + } + break; + case dcp::SubtitleStandard::SMPTE_2007: + case dcp::SubtitleStandard::SMPTE_2010: + switch (align) { + case dcp::VAlign::TOP: + /* v_position is distance from top of frame to top of subtitle */ + y = position * target_height; + break; + case dcp::VAlign::CENTER: + /* v_position is distance from centre of frame to centre of subtitle */ + y = (0.5 + position) * target_height - layout_height / 2; + break; + case dcp::VAlign::BOTTOM: + /* v_position is distance from bottom of frame to bottom of subtitle */ + y = (1.0 - position) * target_height - layout_height; + break; } + } + + return y; +} - FcObjectSetDestroy (object_set); - FcPatternDestroy (pattern); - fc_config_fonts.push_back (make_pair (font_files, font_name)); +struct Layout +{ + Position position; + int baseline_position; + dcp::Size size; + Glib::RefPtr pango; + + int baseline_to_bottom(int border_width) + { + return position.y + size.height - baseline_position - border_width; } +}; - FcConfigSetCurrent (fc_config); - Glib::RefPtr layout = 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 Layout +setup_layout(vector subtitles, dcp::Size target, DCPTime time, int frame_rate) +{ + DCPOMATIC_ASSERT(!subtitles.empty()); + auto const& first = subtitles.front(); + + auto const font_name = FontConfig::instance()->make_font_available(first.font); + auto const fade_factor = calculate_fade_factor(first, time, frame_rate); + auto const markup = marked_up(subtitles, target.height, fade_factor, font_name); + auto layout = create_layout(font_name, markup); + auto ink = layout->get_ink_extents(); + + Layout description; + description.position = { ink.get_x() / Pango::SCALE, ink.get_y() / Pango::SCALE }; + description.baseline_position = layout->get_baseline() / Pango::SCALE; + description.size = { ink.get_width() / Pango::SCALE, ink.get_height() / Pango::SCALE }; + description.pango = layout; + + return description; +} - layout->set_alignment (Pango::ALIGN_LEFT); - context->set_line_width (1); +static +int +border_width_for_subtitle(StringText const& subtitle, dcp::Size target) +{ + return subtitle.effect() == dcp::Effect::BORDER ? (subtitle.outline_width * target.width / 2048.0) : 0; +} - /* 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. +/** @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(vector subtitles, dcp::Size target, DCPTime time, int frame_rate) +{ + /* XXX: this method can only handle italic / bold changes mid-line, + nothing else yet. */ - 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 ()); - 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 (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 (time < fade_in_start || time > fade_out_end) { - fade_factor = 0; + DCPOMATIC_ASSERT(!subtitles.empty ()); + auto const& first = subtitles.front(); + auto const fade_factor = calculate_fade_factor(first, time, frame_rate); + + auto layout = setup_layout(subtitles, target, time, frame_rate); + + /* 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 ()); + } } - /* Render the subtitle at the top left-hand corner of image */ + auto const border_width = border_width_for_subtitle(first, target); + layout.size.width += 2 * ceil (border_width); + layout.size.height += 2 * ceil (border_width); - Pango::FontDescription font (font_name); - layout->set_font_description (font); - layout->set_markup (marked_up (subtitles, target.height, fade_factor)); + layout.size.width *= x_scale; + layout.size.height *= y_scale; - context->scale (xscale, yscale); - layout->update_from_cairo_context (context); + /* Shuffle the subtitle over by the border width (if we have any) so it's not cut off */ + int const x_offset = -layout.position.x + ceil(border_width); + int const y_offset = -layout.position.y + ceil(border_width); - /* 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; + auto image = create_image(layout.size); + auto surface = create_surface (image); + auto context = Cairo::Context::create (surface); + + context->set_line_width (1); + context->scale (x_scale, y_scale); + layout.pango->update_from_cairo_context(context); - if (subtitles.front().effect() == dcp::SHADOW) { + if (first.effect() == dcp::Effect::SHADOW) { /* Drop-shadow effect */ - set_source_rgba (context, subtitles.front().effect_colour(), fade_factor); + set_source_rgba (context, first.effect_colour(), fade_factor); context->move_to (x_offset + 4, y_offset + 4); - layout->add_to_cairo_context (context); + layout.pango->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); + if (first.effect() == dcp::Effect::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); + layout.pango->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); - layout_width *= xscale; - layout_height *= yscale; + set_source_rgba (context, first.colour(), fade_factor); - int x = 0; - switch (subtitles.front().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; - 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; - 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; - break; - } + context->move_to (x_offset, y_offset); + layout.pango->add_to_cairo_context (context); + context->fill (); - int y = 0; - switch (subtitles.front().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 - the case in practice; Gunnar Ásgeirsson's Dolby server appears - 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; - 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; - 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; - break; - } + context->set_line_width (0.5); + context->move_to (x_offset, y_offset); + layout.pango->add_to_cairo_context (context); + context->stroke (); - return PositionImage (image, Position (max (0, x), max (0, y))); + int const x = x_position(first.h_align(), first.h_position(), target.width, layout.size.width); + int const y = y_position(first.valign_standard, first.v_align(), first.v_position(), target.height, layout.baseline_to_bottom(border_width), layout.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 -render_text (list subtitles, list > fonts, dcp::Size target, DCPTime time, int frame_rate) +vector +render_text(vector subtitles, dcp::Size target, DCPTime time, int frame_rate) { - list pending; - list images; - - BOOST_FOREACH (StringText const & i, subtitles) { - if (!pending.empty() && fabs (i.v_position() - pending.back().v_position()) > 1e-4) { - images.push_back (render_line (pending, fonts, target, time, frame_rate)); - pending.clear (); + vector pending; + vector images; + + for (auto const& i: subtitles) { + if (!pending.empty()) { + auto const last = pending.back(); + auto const different_v = i.v_align() != last.v_align() || fabs(i.v_position() - last.v_position()) > 1e-4; + auto const different_h = i.h_align() != last.h_align() || fabs(i.h_position() - pending.back().h_position()) > 1e-4; + if (different_v || different_h) { + /* We need a new line if any new positioning (horizontal or vertical) changes for this section */ + images.push_back(render_line(pending, target, time, frame_rate)); + pending.clear (); + } } pending.push_back (i); } - if (!pending.empty ()) { - images.push_back (render_line (pending, fonts, target, time, frame_rate)); + if (!pending.empty()) { + images.push_back(render_line(pending, target, time, frame_rate)); } return images; } + + +vector> +bounding_box(vector subtitles, dcp::Size target, optional override_standard) +{ + vector pending; + vector> rects; + + auto use_pending = [&pending, &rects, target, override_standard]() { + auto const& subtitle = pending.front(); + auto standard = override_standard.get_value_or(subtitle.valign_standard); + /* We can provide dummy values for time and frame rate here as they are only used to calculate fades */ + auto layout = setup_layout(pending, target, DCPTime(), 24); + int const x = x_position(subtitle.h_align(), subtitle.h_position(), target.width, layout.size.width); + auto const border_width = border_width_for_subtitle(subtitle, target); + int const y = y_position(standard, subtitle.v_align(), subtitle.v_position(), target.height, layout.baseline_to_bottom(border_width), layout.size.height); + rects.push_back({Position(x, y), layout.size.width, layout.size.height}); + }; + + for (auto const& i: subtitles) { + if (!pending.empty() && (i.v_align() != pending.back().v_align() || fabs(i.v_position() - pending.back().v_position()) > 1e-4)) { + use_pending(); + pending.clear(); + } + pending.push_back(i); + } + + if (!pending.empty()) { + use_pending(); + } + + return rects; +} + + +float +FontMetrics::height(StringText const& subtitle) +{ + return get(subtitle)->second.second; +} + + +float +FontMetrics::baseline_to_bottom(StringText const& subtitle) +{ + return get(subtitle)->second.first; +} + + +FontMetrics::Cache::iterator +FontMetrics::get(StringText const& subtitle) +{ + auto id = Identifier(subtitle); + + auto iter = _cache.find(id); + if (iter != _cache.end()) { + return iter; + } + + auto const font_name = FontConfig::instance()->make_font_available(subtitle.font); + auto copy = subtitle; + copy.set_text("Qypjg"); + auto layout = create_layout(font_name, marked_up({copy}, _target_height, 1, font_name)); + auto ink = layout->get_ink_extents(); + auto const scale = float(_target_height * Pango::SCALE); + return _cache.insert({id, { ink.get_y() / scale, ink.get_height() / scale}}).first; +} + + +FontMetrics::Identifier::Identifier(StringText const& subtitle) + : font(subtitle.font) + , size(subtitle.size()) + , aspect_adjust(subtitle.aspect_adjust()) +{ + +} + + +bool +FontMetrics::Identifier::operator<(FontMetrics::Identifier const& other) const +{ + if (font != other.font) { + return font < other.font; + } + + if (size != other.size) { + return size < other.size; + } + + return aspect_adjust < other.aspect_adjust; +} +