Aegisub/src/resolution_resampler.cpp
2014-05-17 18:01:41 -07:00

209 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 <cmath>
#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 = round(val * 8) / 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);
}