69 lines
2.2 KiB
C++
69 lines
2.2 KiB
C++
#include <napi.h>
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#include <vips/vips8>
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using namespace std;
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using namespace vips;
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Napi::Value Uncaption(const Napi::CallbackInfo &info) {
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Napi::Env env = info.Env();
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Napi::Object result = Napi::Object::New(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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float tolerance = obj.Has("tolerance")
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? obj.Get("tolerance").As<Napi::Number>().FloatValue()
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: 0.5;
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string type = obj.Get("type").As<Napi::String>().Utf8Value();
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VOption *options = VImage::option();
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VImage in =
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VImage::new_from_buffer(data.Data(), data.Length(), "",
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type == "gif" ? options->set("n", -1)->set("access", "sequential") : options)
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.colourspace(VIPS_INTERPRETATION_sRGB);
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if (!in.has_alpha()) in = in.bandjoin(255);
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int width = in.width();
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int pageHeight = vips_image_get_page_height(in.get_image());
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int nPages = vips_image_get_n_pages(in.get_image());
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VImage first =
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in.crop(0, 0, 3, pageHeight).colourspace(VIPS_INTERPRETATION_B_W) >
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(255 * tolerance);
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int top, captionWidth, captionHeight;
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first.find_trim(&top, &captionWidth, &captionHeight);
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vector<VImage> img;
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int newHeight = pageHeight - top;
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if (top == pageHeight) {
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newHeight = pageHeight;
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top = 0;
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}
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for (int i = 0; i < nPages; i++) {
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VImage img_frame =
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in.crop(0, (i * pageHeight) + top, width, newHeight);
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img.push_back(img_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, newHeight);
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void *buf;
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size_t length;
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final.write_to_buffer(
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("." + type).c_str(), &buf, &length,
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type == "gif" ? VImage::option()->set("dither", 0)->set("reoptimise", 1) : 0);
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result.Set("data", Napi::Buffer<char>::Copy(env, (char *)buf, length));
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result.Set("type", type);
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} catch (std::exception const &err) {
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Napi::Error::New(env, err.what()).ThrowAsJavaScriptException();
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} catch (...) {
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Napi::Error::New(env, "Unknown error").ThrowAsJavaScriptException();
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}
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vips_error_clear();
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vips_thread_shutdown();
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return result;
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}
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