#include <fontconfig/fontconfig.h>
#include <cairomm/cairomm.h>
#include <pangomm.h>
+#include <pango/pangocairo.h>
#ifndef DCPOMATIC_HAVE_SHOW_IN_CAIRO_CONTEXT
#include <pango/pangocairo.h>
#endif
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<StringText> 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;
+static shared_ptr<Image>
+create_image (dcp::Size size)
+{
/* 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));
+ shared_ptr<Image> image (new Image(AV_PIX_FMT_BGRA, size, false));
image->make_black ();
+ return image;
+}
+
+static Cairo::RefPtr<Cairo::ImageSurface>
+create_surface (shared_ptr<Image> image)
+{
#ifdef DCPOMATIC_HAVE_FORMAT_STRIDE_FOR_WIDTH
Cairo::RefPtr<Cairo::ImageSurface> surface = Cairo::ImageSurface::create (
image->data()[0],
);
#endif
- Cairo::RefPtr<Cairo::Context> context = Cairo::Context::create (surface);
+ return surface;
+}
+
+static string
+setup_font (StringText const& subtitle, list<shared_ptr<Font> > const& fonts)
+{
if (!fc_config) {
fc_config = FcInitLoadConfig ();
}
}
BOOST_FOREACH (shared_ptr<Font> i, fonts) {
- if (i->id() == subtitles.front().font() && i->file()) {
+ if (i->id() == subtitle.font() && i->file()) {
font_file = i->file ();
}
}
}
FcConfigSetCurrent (fc_config);
+ return font_name;
+}
- Glib::RefPtr<Pango::Layout> 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();
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<Pango::Layout> 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<Pango::Layout>
+create_layout()
+{
+ PangoFontMap* c_font_map = pango_cairo_font_map_new ();
+ Glib::RefPtr<Pango::FontMap> font_map = Glib::wrap (c_font_map);
+ PangoContext* c_context = pango_font_map_create_context (c_font_map);
+ Glib::RefPtr<Pango::Context> 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<StringText> 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 ());
+ 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<Pango::Layout> 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> image = create_image (size);
+ Cairo::RefPtr<Cairo::Surface> surface = create_surface (image);
+ Cairo::RefPtr<Cairo::Context> 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);
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)));
+ int const x = x_position (first, target.width, size.width);
+ int const y = y_position (first, target.height, size.height);
+ 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.
*/
projects / dcpomatic.git / blobdiff