using std::pair;
using std::shared_ptr;
using std::string;
+using boost::optional;
using namespace dcpomatic;
static int
-x_position (StringText const& first, int target_width, int layout_width)
+x_position(dcp::HAlign align, float position, int target_width, int layout_width)
{
int x = 0;
- switch (first.h_align()) {
+ switch (align) {
case dcp::HAlign::LEFT:
/* h_position is distance between left of frame and left of subtitle */
- x = first.h_position() * target_width;
+ x = 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;
+ 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 - first.h_position()) * target_width - layout_width;
+ x = (1.0 - position) * target_width - layout_width;
break;
}
}
+/** @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 (StringText const& first, int target_height, int baseline_to_bottom, int layout_height)
+y_position(dcp::SubtitleStandard standard, dcp::VAlign align, float position, int target_height, int baseline_to_bottom, int layout_height)
{
int y = 0;
- switch (first.valign_standard) {
+ switch (standard) {
case dcp::SubtitleStandard::INTEROP:
case dcp::SubtitleStandard::SMPTE_2014:
- switch (first.v_align()) {
+ switch (align) {
case dcp::VAlign::TOP:
- /* v_position is distance from top of frame to subtitle baseline */
- y = first.v_position() * target_height - (layout_height - baseline_to_bottom);
+ /* position is distance from top of frame to subtitle baseline */
+ y = position * target_height - (layout_height - baseline_to_bottom);
break;
case dcp::VAlign::CENTER:
- /* v_position is distance from centre of frame to subtitle baseline */
- y = (0.5 + first.v_position()) * target_height - (layout_height - baseline_to_bottom);
+ /* 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:
- /* v_position is distance from bottom of frame to subtitle baseline */
- y = (1.0 - first.v_position()) * target_height - (layout_height - baseline_to_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 (first.v_align()) {
+ switch (align) {
case dcp::VAlign::TOP:
/* v_position is distance from top of frame to top of subtitle */
- y = first.v_position() * target_height;
+ y = position * target_height;
break;
case dcp::VAlign::CENTER:
/* v_position is distance from centre of frame to centre of subtitle */
- y = (0.5 + first.v_position()) * target_height - layout_height / 2;
+ 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 - first.v_position()) * target_height - layout_height;
+ y = (1.0 - position) * target_height - layout_height;
break;
}
}
layout.pango->add_to_cairo_context (context);
context->stroke ();
- int const x = x_position(first, target.width, layout.size.width);
- int const y = y_position(first, target.height, layout.position.y, layout.size.height);
+ 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.position.y, layout.size.height);
return PositionImage (image, Position<int>(max (0, x), max(0, y)));
}
}
+list<dcpomatic::Rect<int>>
+bounding_box(list<StringText> subtitles, dcp::Size target, optional<dcp::SubtitleStandard> override_standard)
+{
+ list<StringText> pending;
+ list<dcpomatic::Rect<int>> 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);
+ int const y = y_position(standard, subtitle.v_align(), subtitle.v_position(), target.height, layout.position.y, layout.size.height);
+ rects.push_back({Position<int>(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)
{
projects / dcpomatic.git / blobdiff