More renaming.

sed -i "s/emit_text/emit_plain/g" src/lib/*.cc src/lib/*.h
sed -i "s/emit_image_start/emit_bitmap_start/g" src/lib/*.cc src/lib/*.h
sed -i "s/emit_text_start/emit_plain_start/g" src/lib/*.cc src/lib/*.h
sed -i "s/render_subtitles/render_text/g" src/lib/*.cc src/lib/*.h src/lib/wscript test/*.cc
sed -i "s/ImageStart/BitmapStart/g" src/lib/*.cc src/lib/*.h
sed -i "s/TextStart/PlainStart/g" src/lib/*.cc src/lib/*.h test/*.cc src/wx/*.cc
sed -i "s/ImageSubtitle/BitmapText/g" src/lib/*.cc src/lib/*.h
sed -i "s/text_subtitle/plain_text/g" src/lib/*.cc src/lib/*.h src/lib/wscript src/wx/*.cc src/wx/*.h test/*.cc
sed -i "s/image_subtitle/bitmap_text/g" src/lib/*.cc src/lib/*.h
mv src/lib/render_subtitles.cc src/lib/render_text.cc
mv src/lib/render_subtitles.h src/lib/render_text.h
mv src/lib/text_subtitle.cc src/lib/plain_text.cc
mv src/lib/text_subtitle.h src/lib/plain_text.h

1 files changed, 386 insertions, 0 deletions

diff --git a/src/lib/render_text.cc b/src/lib/render_text.cc
new file mode 100644
index 000000000..673078347
--- /dev/null
+++ b/src/lib/render_text.cc
@@ -0,0 +1,386 @@
+/*
+    Copyright (C) 2014-2016 Carl Hetherington <cth@carlh.net>
+
+    This file is part of DCP-o-matic.
+
+    DCP-o-matic is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    DCP-o-matic is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+#include "render_text.h"
+#include "types.h"
+#include "image.h"
+#include "cross.h"
+#include "font.h"
+#include "dcpomatic_assert.h"
+#include <dcp/raw_convert.h>
+#include <fontconfig/fontconfig.h>
+#include <cairomm/cairomm.h>
+#include <pangomm.h>
+#ifndef DCPOMATIC_HAVE_SHOW_IN_CAIRO_CONTEXT
+#include <pango/pangocairo.h>
+#endif
+#include <boost/foreach.hpp>
+#include <boost/algorithm/string.hpp>
+#include <iostream>
+
+using std::list;
+using std::cout;
+using std::string;
+using std::min;
+using std::max;
+using std::pair;
+using std::cerr;
+using std::make_pair;
+using boost::shared_ptr;
+using boost::optional;
+using boost::algorithm::replace_all;
+
+static FcConfig* fc_config = 0;
+static list<pair<FontFiles, string> > fc_config_fonts;
+
+string
+marked_up (list<SubtitleString> subtitles, int target_height, float fade_factor)
+{
+	string out;
+
+	BOOST_FOREACH (SubtitleString const & i, subtitles) {
+		out += "<span ";
+		if (i.italic()) {
+			out += "style=\"italic\" ";
+		}
+		if (i.bold()) {
+			out += "weight=\"bold\" ";
+		}
+		if (i.underline()) {
+			out += "underline=\"single\" ";
+		}
+		out += "size=\"" + dcp::raw_convert<string>(i.size_in_pixels(target_height) * 72 * 1024 / 96) + "\" ";
+		/* Between 1-65535 inclusive, apparently... */
+		out += "alpha=\"" + dcp::raw_convert<string>(int(floor(fade_factor * 65534)) + 1) + "\" ";
+		out += "color=\"#" + i.colour().to_rgb_string() + "\">";
+
+		string t = i.text();
+		replace_all(t, "&", "&amp;");
+		out += t;
+
+		out += "</span>";
+	}
+
+	return out;
+}
+
+static void
+set_source_rgba (Cairo::RefPtr<Cairo::Context> 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<SubtitleString> subtitles, list<shared_ptr<Font> > 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> image (new Image (AV_PIX_FMT_BGRA, dcp::Size (target.width, height), false));
+	image->make_black ();
+
+#ifdef DCPOMATIC_HAVE_FORMAT_STRIDE_FOR_WIDTH
+	Cairo::RefPtr<Cairo::ImageSurface> surface = Cairo::ImageSurface::create (
+		image->data()[0],
+		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
+	/* 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<Cairo::ImageSurface> surface = Cairo::ImageSurface::create (
+		image->data()[0],
+		Cairo::FORMAT_ARGB32,
+		image->size().width,
+		image->size().height,
+		image->size().width * 4
+		);
+#endif
+
+	Cairo::RefPtr<Cairo::Context> context = Cairo::Context::create (surface);
+
+	if (!fc_config) {
+		fc_config = FcConfigCreate ();
+	}
+
+	FontFiles font_files;
+
+	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) {
+
+	}
+
+	/* 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");
+	}
+
+	BOOST_FOREACH (shared_ptr<Font> i, fonts) {
+		if (i->id() == subtitles.front().font() && i->file(FontFiles::NORMAL)) {
+			font_files = i->files ();
+		}
+	}
+
+	list<pair<FontFiles, string> >::const_iterator existing = fc_config_fonts.begin ();
+	while (existing != fc_config_fonts.end() && existing->first != font_files) {
+		++existing;
+	}
+
+	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<FontFiles::Variant>(i))) {
+				FcConfigAppFontAddFile (
+					fc_config,
+					reinterpret_cast<FcChar8 const *> (font_files.get(static_cast<FontFiles::Variant>(i)).get().string().c_str())
+					);
+			}
+		}
+
+		FcPattern* pattern = FcPatternBuild (
+			0, FC_FILE, FcTypeString, font_files.get(FontFiles::NORMAL).get().string().c_str(), static_cast<char *> (0)
+			);
+		FcObjectSet* object_set = FcObjectSetBuild (FC_FAMILY, FC_STYLE, FC_LANG, FC_FILE, static_cast<char *> (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<char const *> (family);
+				}
+			}
+
+			FcFontSetDestroy (font_set);
+		}
+
+		FcObjectSetDestroy (object_set);
+		FcPatternDestroy (pattern);
+
+		fc_config_fonts.push_back (make_pair (font_files, font_name));
+	}
+
+	FcConfigSetCurrent (fc_config);
+
+	Glib::RefPtr<Pango::Layout> layout = Pango::Layout::create (context);
+
+	layout->set_alignment (Pango::ALIGN_LEFT);
+
+	context->set_line_width (1);
+	context->set_antialias (Cairo::ANTIALIAS_GRAY);
+	Cairo::FontOptions fo;
+	context->get_font_options (fo);
+	fo.set_antialias (Cairo::ANTIALIAS_GRAY);
+	context->set_font_options (fo);
+
+	/* 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 ());
+
+	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;
+	}
+
+	/* 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
+
+	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<int> (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<PositionImage>
+render_text (list<SubtitleString> subtitles, list<shared_ptr<Font> > fonts, dcp::Size target, DCPTime time, int frame_rate)
+{
+	list<SubtitleString> pending;
+	list<PositionImage> images;
+
+	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, time, frame_rate));
+			pending.clear ();
+		}
+		pending.push_back (i);
+	}
+
+	if (!pending.empty ()) {
+		images.push_back (render_line (pending, fonts, target, time, frame_rate));
+	}
+
+	return images;
+}