X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;f=src%2Flib%2Frender_text.cc;h=de33f9380b1b09dfd4a9cde380874aba93e9251f;hb=83416808c0b1ca732e7a186d3811f1ec796fea08;hp=8d5f8e6a94892170ce28903af6a47b9c3f1862a0;hpb=d344fb643df11cd8dcc766a5e3819d422493ab9f;p=dcpomatic.git diff --git a/src/lib/render_text.cc b/src/lib/render_text.cc index 8d5f8e6a9..de33f9380 100644 --- a/src/lib/render_text.cc +++ b/src/lib/render_text.cc @@ -28,6 +28,7 @@ #include #include #include +#include #ifndef DCPOMATIC_HAVE_SHOW_IN_CAIRO_CONTEXT #include #endif @@ -46,6 +47,7 @@ using std::make_pair; using boost::shared_ptr; using boost::optional; using boost::algorithm::replace_all; +using namespace dcpomatic; static FcConfig* fc_config = 0; static list > fc_config_fonts; @@ -87,52 +89,20 @@ set_source_rgba (Cairo::RefPtr context, dcp::Colour colour, floa 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; +static shared_ptr +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 (target.width, height), false)); + shared_ptr image (new Image(AV_PIX_FMT_BGRA, size, false)); image->make_black (); + return image; +} + +static Cairo::RefPtr +create_surface (shared_ptr image) +{ #ifdef DCPOMATIC_HAVE_FORMAT_STRIDE_FOR_WIDTH Cairo::RefPtr surface = Cairo::ImageSurface::create ( image->data()[0], @@ -155,8 +125,13 @@ render_line (list subtitles, list > fonts, dcp::Siz ); #endif - Cairo::RefPtr context = Cairo::Context::create (surface); + return surface; +} + +static string +setup_font (StringText const& subtitle, list > const& fonts) +{ if (!fc_config) { fc_config = FcInitLoadConfig (); } @@ -176,7 +151,7 @@ render_line (list subtitles, list > fonts, dcp::Siz } BOOST_FOREACH (shared_ptr i, fonts) { - if (i->id() == subtitles.front().font() && i->file()) { + if (i->id() == subtitle.font() && i->file()) { font_file = i->file (); } } @@ -222,23 +197,22 @@ render_line (list subtitles, list > fonts, dcp::Siz } FcConfigSetCurrent (fc_config); + return font_name; +} - Glib::RefPtr layout = Pango::Layout::create (context); - - layout->set_alignment (Pango::ALIGN_LEFT); - - context->set_line_width (1); - /* Compute fade factor */ +static float +calculate_fade_factor (StringText const& first, DCPTime time, int frame_rate) +{ 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(); @@ -250,34 +224,155 @@ render_line (list subtitles, list > fonts, dcp::Siz fade_factor = 0; } - /* Render the subtitle at the top left-hand corner of image */ + return fade_factor; +} + + +static int +x_position (StringText const& first, int target_width, int layout_width) +{ + int x = 0; + switch (first.h_align ()) { + case dcp::HALIGN_LEFT: + /* h_position is distance between left of frame and left of subtitle */ + 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 + 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 - 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 (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 + 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 = 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 + 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 - first.v_position()) * target_height - layout_height; + break; + } + + 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 (marked_up (subtitles, target.height, fade_factor)); + layout->set_markup (markup); +} - context->scale (xscale, yscale); - layout->update_from_cairo_context (context); +/** 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 (); + Glib::RefPtr font_map = Glib::wrap (c_font_map); + PangoContext* c_context = pango_font_map_create_context (c_font_map); + 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 ()); + } + } + + size.width *= x_scale; + size.height *= y_scale; /* 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; + int const x_offset = first.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) { + 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, 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); context->fill (); } - if (subtitles.front().effect() == dcp::BORDER) { + if (first.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); + set_source_rgba (context, first.effect_colour(), fade_factor); + context->set_line_width (first.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); @@ -294,52 +389,12 @@ render_line (list subtitles, list > fonts, dcp::Siz 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; - - 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; - } - - 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; - } - - return PositionImage (image, Position (max (0, x), max (0, y))); + 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 frame_rate DCP frame rate. */