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