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// Display images inside a terminal
// Copyright (C) 2023 JustKidding
//
// This program 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 3 of the License, or
// (at your option) any later version.
//
// This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
#include "libvips.hpp"
#include "dimensions.hpp"
#include "flags.hpp"
#include "terminal.hpp"
#include "util.hpp"
#include <algorithm>
#include <unordered_set>
#ifdef ENABLE_OPENCV
# include <opencv2/videoio.hpp>
#endif
using vips::VError;
using vips::VImage;
LibvipsImage::LibvipsImage(std::shared_ptr<Dimensions> new_dims, const std::string &filename, bool in_cache)
: path(filename),
dims(std::move(new_dims)),
max_width(dims->max_wpixels()),
max_height(dims->max_hpixels()),
in_cache(in_cache)
{
image = VImage::new_from_file(path.c_str()).colourspace(VIPS_INTERPRETATION_sRGB);
flags = Flags::instance();
logger = spdlog::get("vips");
logger->info("loading file {}", filename);
try {
// animated images should have both n-pages and delay
npages = image.get_int("n-pages");
std::ignore = image.get_array_int("delay");
is_anim = true;
logger->info("file is an animated image");
auto *opts = VImage::option()->set("n", -1);
backup = VImage::new_from_file(filename.c_str(), opts).colourspace(VIPS_INTERPRETATION_sRGB);
orig_height = backup.height() / npages;
image = backup.crop(0, 0, backup.width(), orig_height);
} catch (const VError &err) {
logger->debug("Failed to process image animation");
}
if (!is_anim) {
image = image.autorot();
}
process_image();
}
auto LibvipsImage::dimensions() const -> const Dimensions &
{
return *dims;
}
auto LibvipsImage::filename() const -> std::string
{
return path.string();
}
auto LibvipsImage::width() const -> int
{
return image.width();
}
auto LibvipsImage::height() const -> int
{
return image.height();
}
auto LibvipsImage::size() const -> size_t
{
return _size;
}
auto LibvipsImage::data() const -> const unsigned char *
{
return _data.get();
}
auto LibvipsImage::channels() const -> int
{
return image.bands();
}
auto LibvipsImage::is_animated() const -> bool
{
return is_anim;
}
auto LibvipsImage::next_frame() -> void
{
if (!is_anim) {
return;
}
top += orig_height;
if (top == backup.height()) {
top = 0;
}
image = backup.crop(0, top, backup.width(), orig_height);
process_image();
}
auto LibvipsImage::frame_delay() const -> int
{
if (!is_anim) {
return -1;
}
try {
const auto delays = backup.get_array_int("delay");
const int ms_per_sec = 1000;
if (delays.at(0) == 0) {
#ifdef ENABLE_OPENCV
const cv::VideoCapture video(path);
if (video.isOpened()) {
return static_cast<int>((1.0 / video.get(cv::CAP_PROP_FPS)) * ms_per_sec);
}
#endif
return static_cast<int>((1.0 / npages) * ms_per_sec);
}
return delays.at(0);
} catch (const VError &err) {
return -1;
}
}
auto LibvipsImage::resize_image() -> void
{
if (in_cache) {
return;
}
const auto [new_width, new_height] = get_new_sizes(max_width, max_height, dims->scaler, flags->scale_factor);
if (new_width <= 0 && new_height <= 0) {
// ensure width and height are pair
if (flags->needs_scaling) {
const auto curw = width();
const auto curh = height();
if ((curw % 2) != 0 || (curh % 2) != 0) {
auto *opts = VImage::option()
->set("height", util::round_up(curh, flags->scale_factor))
->set("size", VIPS_SIZE_FORCE);
image = image.thumbnail_image(util::round_up(curw, flags->scale_factor), opts);
}
}
return;
}
logger->debug("Resizing image");
auto *opts = VImage::option()->set("height", new_height)->set("size", VIPS_SIZE_FORCE);
image = image.thumbnail_image(new_width, opts);
if (is_anim || flags->no_cache) {
return;
}
const auto save_location = util::get_cache_file_save_location(path);
try {
image.write_to_file(save_location.c_str());
logger->debug("Saved resized image");
} catch (const VError &err) {
logger->debug("Could not save resized image");
}
}
auto LibvipsImage::process_image() -> void
{
resize_image();
if (flags->origin_center) {
const double img_width = static_cast<double>(width()) / dims->terminal->font_width;
const double img_height = static_cast<double>(height()) / dims->terminal->font_height;
dims->x -= std::floor(img_width / 2);
dims->y -= std::floor(img_height / 2);
}
const std::unordered_set<std::string_view> bgra_trifecta = {"x11", "chafa", "wayland"};
#ifdef ENABLE_OPENGL
if (flags->use_opengl) {
image = image.flipver();
}
#endif
if (bgra_trifecta.contains(flags->output)) {
// alpha channel required
if (!image.has_alpha()) {
const int alpha_value = 255;
image = image.bandjoin(alpha_value);
}
// convert from RGB to BGR
auto bands = image.bandsplit();
std::swap(bands[0], bands[2]);
image = VImage::bandjoin(bands);
} else if (flags->output == "sixel") {
// sixel expects RGB888
if (image.has_alpha()) {
image = image.flatten();
}
}
_size = VIPS_IMAGE_SIZEOF_IMAGE(image.get_image());
_data.reset(static_cast<unsigned char *>(image.write_to_memory(&_size)));
}
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