mrmBot-Matrix/natives/caption.cc

88 lines
3.2 KiB
C++
Raw Normal View History

2022-02-23 01:43:22 +00:00
#include <napi.h>
#include <iostream>
2022-02-12 21:09:59 +00:00
#include <vips/vips8>
using namespace std;
2022-02-12 21:09:59 +00:00
using namespace vips;
/*void finalizer(Napi::Env env, char* data) {
free(data);
}*/
Napi::Value Caption(const Napi::CallbackInfo &info) {
Napi::Env env = info.Env();
try {
Napi::Object obj = info[0].As<Napi::Object>();
Napi::Buffer<char> data = obj.Get("data").As<Napi::Buffer<char>>();
string caption = obj.Get("caption").As<Napi::String>().Utf8Value();
2021-08-07 03:27:50 +00:00
string font = obj.Get("font").As<Napi::String>().Utf8Value();
string type = obj.Get("type").As<Napi::String>().Utf8Value();
int delay =
obj.Has("delay") ? obj.Get("delay").As<Napi::Number>().Int32Value() : 0;
2022-02-23 01:43:22 +00:00
VOption *options = VImage::option()->set("access", "sequential");
VImage in =
VImage::new_from_buffer(data.Data(), data.Length(), "",
type == "gif" ? options->set("n", -1) : options)
.colourspace(VIPS_INTERPRETATION_sRGB);
if (!in.has_alpha()) in = in.bandjoin(255);
2022-02-12 21:09:59 +00:00
int width = in.width();
int size = width / 10;
int page_height = vips_image_get_page_height(in.get_image());
int n_pages = vips_image_get_n_pages(in.get_image());
int textWidth = width - ((width / 25) * 2);
2022-02-23 01:43:22 +00:00
string font_string = (font == "roboto" ? "Roboto Condensed" : font) + " " +
(font != "impact" ? "bold" : "normal") + " " +
to_string(size);
2021-02-25 21:09:53 +00:00
2022-02-23 01:43:22 +00:00
string captionText = "<span background=\"white\">" + caption + "</span>";
2022-02-12 21:09:59 +00:00
VImage text =
VImage::text(captionText.c_str(), VImage::option()
2022-02-23 01:43:22 +00:00
->set("rgba", true)
->set("align", VIPS_ALIGN_CENTRE)
->set("font", font_string.c_str())
->set("width", textWidth));
VImage captionImage =
((text == (vector<double>){0, 0, 0, 0}).bandand())
.ifthenelse(255, text)
.gravity(VIPS_COMPASS_DIRECTION_CENTRE, width, text.height() + size,
VImage::option()->set("extend", "white"));
2022-02-12 21:09:59 +00:00
vector<VImage> img;
for (int i = 0; i < n_pages; i++) {
2022-02-23 01:43:22 +00:00
VImage img_frame =
type == "gif" ? in.crop(0, i * page_height, width, page_height) : in;
VImage frame = captionImage.join(
img_frame, VIPS_DIRECTION_VERTICAL,
VImage::option()->set("background", 0xffffff)->set("expand", true));
img.push_back(frame);
}
2022-02-12 21:09:59 +00:00
VImage final = VImage::arrayjoin(img, VImage::option()->set("across", 1));
final.set(VIPS_META_PAGE_HEIGHT, page_height + captionImage.height());
2022-02-23 01:43:22 +00:00
if (delay) final.set("delay", delay);
2022-02-12 21:09:59 +00:00
void *buf;
size_t length;
2022-02-23 01:43:22 +00:00
final.write_to_buffer(
("." + type).c_str(), &buf, &length,
type == "gif" ? VImage::option()->set("dither", 0) : 0);
2022-02-12 21:09:59 +00:00
vips_thread_shutdown();
Napi::Object result = Napi::Object::New(env);
2022-02-23 01:43:22 +00:00
result.Set("data", Napi::Buffer<char>::New(env, (char *)buf, length));
result.Set("type", type);
return result;
} catch (std::exception const &err) {
2022-02-12 21:09:59 +00:00
cerr << "Error: " << err.what() << endl;
throw Napi::Error::New(env, err.what());
} catch (...) {
throw Napi::Error::New(env, "Unknown error");
}
2022-02-12 21:09:59 +00:00
}