82 lines
3.1 KiB
C++
82 lines
3.1 KiB
C++
#include <napi.h>
|
|
|
|
#include <vips/vips8>
|
|
|
|
using namespace std;
|
|
using namespace vips;
|
|
|
|
Napi::Value Caption(const Napi::CallbackInfo &info) {
|
|
Napi::Env env = info.Env();
|
|
Napi::Object result = Napi::Object::New(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();
|
|
string font = obj.Get("font").As<Napi::String>().Utf8Value();
|
|
string type = obj.Get("type").As<Napi::String>().Utf8Value();
|
|
|
|
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);
|
|
|
|
int width = in.width();
|
|
int size = width / 10;
|
|
int pageHeight = vips_image_get_page_height(in.get_image());
|
|
int nPages = vips_image_get_n_pages(in.get_image());
|
|
int textWidth = width - ((width / 25) * 2);
|
|
|
|
string font_string = (font == "roboto" ? "Roboto Condensed" : font) + " " +
|
|
(font != "impact" ? "bold" : "normal") + " " +
|
|
to_string(size);
|
|
|
|
string captionText = "<span background=\"white\">" + caption + "</span>";
|
|
|
|
VImage text =
|
|
VImage::text(captionText.c_str(), VImage::option()
|
|
->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"));
|
|
|
|
vector<VImage> img;
|
|
for (int i = 0; i < nPages; i++) {
|
|
VImage img_frame =
|
|
type == "gif" ? in.crop(0, i * pageHeight, width, pageHeight) : in;
|
|
VImage frame = captionImage.join(
|
|
img_frame, VIPS_DIRECTION_VERTICAL,
|
|
VImage::option()->set("background", 0xffffff)->set("expand", true));
|
|
img.push_back(frame);
|
|
}
|
|
VImage final = VImage::arrayjoin(img, VImage::option()->set("across", 1));
|
|
final.set(VIPS_META_PAGE_HEIGHT, pageHeight + captionImage.height());
|
|
|
|
void *buf;
|
|
size_t length;
|
|
final.write_to_buffer(
|
|
("." + type).c_str(), &buf, &length,
|
|
type == "gif" ? VImage::option()->set("dither", 0)->set("reoptimise", 1)
|
|
: 0);
|
|
|
|
result.Set("data", Napi::Buffer<char>::New(env, (char *)buf, length));
|
|
result.Set("type", type);
|
|
} catch (std::exception const &err) {
|
|
Napi::Error::New(env, err.what()).ThrowAsJavaScriptException();
|
|
} catch (...) {
|
|
Napi::Error::New(env, "Unknown error").ThrowAsJavaScriptException();
|
|
}
|
|
|
|
vips_error_clear();
|
|
vips_thread_shutdown();
|
|
return result;
|
|
}
|