Aegisub/src/resolution_resampler.cpp
Thomas Goyne 229b6cf63d Fix resampling drawings with AR changes
The shift from margins should be applied only to the line's position,
not to each point in the drawing, and the scale needs to compensate for
that the scale on the style is being changed as well.
2014-05-17 18:01:41 -07:00

208 lines
6.2 KiB
C++

// Copyright (c) 2013, Thomas Goyne <plorkyeran@aegisub.org>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
//
// Aegisub Project http://www.aegisub.org/
#include "resolution_resampler.h"
#include "ass_dialogue.h"
#include "ass_file.h"
#include "ass_style.h"
#include "utils.h"
#include <libaegisub/of_type_adaptor.h>
#include <libaegisub/split.h>
#include <libaegisub/util.h>
#include <algorithm>
#include <boost/algorithm/string/predicate.hpp>
#include <boost/lexical_cast.hpp>
#include <functional>
enum {
LEFT = 0,
RIGHT = 1,
TOP = 2,
BOTTOM = 3
};
namespace {
std::string transform_drawing(std::string const& drawing, int shift_x, int shift_y, double scale_x, double scale_y) {
bool is_x = true;
std::string final;
final.reserve(drawing.size());
for (auto const& cur : agi::Split(drawing, ' ')) {
double val;
if (agi::util::try_parse(agi::str(cur), &val)) {
if (is_x)
val = (val + shift_x) * scale_x;
else
val = (val + shift_y) * scale_y;
val = int(val * 8 + .5) / 8.0; // round to eighth-pixels
final += float_to_string(val);
final += ' ';
is_x = !is_x;
}
else if (cur.size() == 1) {
char c = tolower(cur[0]);
if (c == 'm' || c == 'n' || c == 'l' || c == 'b' || c == 's' || c == 'p' || c == 'c') {
is_x = true;
final += c;
final += ' ';
}
}
}
if (final.size())
final.pop_back();
return final;
}
struct resample_state {
const int *margin;
double rx;
double ry;
double ar;
};
void resample_tags(std::string const& name, AssOverrideParameter *cur, void *ud) {
resample_state *state = static_cast<resample_state *>(ud);
double resizer = 1.0;
int shift = 0;
switch (cur->classification) {
case AssParameterClass::ABSOLUTE_SIZE:
resizer = state->ry;
break;
case AssParameterClass::ABSOLUTE_POS_X:
resizer = state->rx;
shift = state->margin[LEFT];
break;
case AssParameterClass::ABSOLUTE_POS_Y:
resizer = state->ry;
shift = state->margin[TOP];
break;
case AssParameterClass::RELATIVE_SIZE_X:
resizer = state->ar;
break;
case AssParameterClass::RELATIVE_SIZE_Y:
break;
case AssParameterClass::DRAWING: {
cur->Set(transform_drawing(
cur->Get<std::string>(),
state->margin[LEFT], state->margin[TOP], state->rx, state->ry));
return;
}
default:
return;
}
VariableDataType curType = cur->GetType();
if (curType == VariableDataType::FLOAT)
cur->Set((cur->Get<double>() + shift) * resizer);
else if (curType == VariableDataType::INT)
cur->Set<int>((cur->Get<int>() + shift) * resizer + 0.5);
}
void resample_line(resample_state *state, AssDialogue &diag) {
if (diag.Comment && (boost::starts_with(diag.Effect.get(), "template") || boost::starts_with(diag.Effect.get(), "code")))
return;
auto blocks = diag.ParseTags();
for (auto block : blocks | agi::of_type<AssDialogueBlockOverride>())
block->ProcessParameters(resample_tags, state);
for (auto drawing : blocks | agi::of_type<AssDialogueBlockDrawing>())
drawing->text = transform_drawing(drawing->text, 0, 0, state->rx / state->ar, state->ry);
for (size_t i = 0; i < 3; ++i)
diag.Margin[i] = int((diag.Margin[i] + state->margin[i]) * (i < 2 ? state->rx : state->ry) + 0.5);
diag.UpdateText(blocks);
}
void resample_style(resample_state *state, AssStyle &style) {
style.fontsize = int(style.fontsize * state->ry + 0.5);
style.outline_w *= state->ry;
style.shadow_w *= state->ry;
style.spacing *= state->rx;
style.scalex *= state->ar;
for (int i = 0; i < 3; i++)
style.Margin[i] = int((style.Margin[i] + state->margin[i]) * (i < 2 ? state->rx : state->ry) + 0.5);
style.UpdateData();
}
}
void ResampleResolution(AssFile *ass, ResampleSettings settings) {
auto horizontal_stretch = 1.0;
auto old_ar = double(settings.source_x) / settings.source_y;
auto new_ar = double(settings.dest_x) / settings.dest_y;
bool border_horizontally = new_ar > old_ar;
// Don't convert aspect ratio if it's very close to correct
// (for reference, 848x480 <-> 1280x720 is .006)
if (abs(old_ar - new_ar) / new_ar > .01) {
switch (settings.ar_mode) {
case ResampleARMode::RemoveBorder:
border_horizontally = !border_horizontally;
case ResampleARMode::AddBorder:
if (border_horizontally) // Wider/Shorter
settings.margin[LEFT] = settings.margin[RIGHT] = (settings.source_y * new_ar - settings.source_x) / 2;
else // Taller/Narrower
settings.margin[TOP] = settings.margin[BOTTOM] = (settings.source_x / new_ar - settings.source_y) / 2;
break;
case ResampleARMode::Stretch:
horizontal_stretch = new_ar / old_ar;
break;
case ResampleARMode::Manual:
old_ar =
double(settings.source_x + settings.margin[LEFT] + settings.margin[RIGHT]) /
double(settings.source_y + settings.margin[TOP] + settings.margin[BOTTOM]);
if (abs(old_ar - new_ar) / new_ar > .01)
horizontal_stretch = new_ar / old_ar;
break;
}
}
// Add margins to original resolution
settings.source_x += settings.margin[LEFT] + settings.margin[RIGHT];
settings.source_y += settings.margin[TOP] + settings.margin[BOTTOM];
resample_state state = {
settings.margin,
double(settings.dest_x) / double(settings.source_x),
double(settings.dest_y) / double(settings.source_y),
horizontal_stretch
};
for (auto& line : ass->Styles)
resample_style(&state, line);
for (auto& line : ass->Events)
resample_line(&state, line);
ass->SetScriptInfo("PlayResX", std::to_string(settings.dest_x));
ass->SetScriptInfo("PlayResY", std::to_string(settings.dest_y));
ass->Commit(_("resolution resampling"), AssFile::COMMIT_SCRIPTINFO | AssFile::COMMIT_DIAG_FULL);
}