165 lines
5.9 KiB
C++
165 lines
5.9 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 Watermark(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 water = obj.Get("water").As<Napi::String>().Utf8Value();
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int gravity = obj.Get("gravity").As<Napi::Number>().Int64Value();
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bool resize = obj.Has("resize")
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? obj.Get("resize").As<Napi::Boolean>().Value()
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: false;
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float yscale = obj.Has("yscale")
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? obj.Get("yscale").As<Napi::Number>().FloatValue()
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: false;
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bool append = obj.Has("append")
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? obj.Get("append").As<Napi::Boolean>().Value()
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: false;
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bool alpha =
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obj.Has("alpha") ? obj.Get("alpha").As<Napi::Boolean>().Value() : false;
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bool mc = obj.Has("mc") ? obj.Get("mc").As<Napi::Boolean>().Value() : false;
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string basePath = obj.Get("basePath").As<Napi::String>().Utf8Value();
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string type = obj.Get("type").As<Napi::String>().Utf8Value();
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VOption *options = VImage::option()->set("access", "sequential");
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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) : 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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string merged = basePath + water;
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VImage watermark = VImage::new_from_file(merged.c_str());
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int width = in.width();
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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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if (resize && append) {
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watermark = watermark.resize((double)width / (double)watermark.width());
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} else if (resize && yscale) {
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watermark = watermark.resize(
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(double)width / (double)watermark.width(),
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VImage::option()->set("vscale", (double)(page_height * yscale) /
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(double)watermark.height()));
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} else if (resize) {
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watermark =
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watermark.resize((double)page_height / (double)watermark.height());
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}
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int x = 0, y = 0;
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switch (gravity) {
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case 1:
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break;
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case 2:
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x = (width / 2) - (watermark.width() / 2);
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break;
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case 3:
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x = width - watermark.width();
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break;
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case 5:
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x = (width / 2) - (watermark.width() / 2);
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y = (page_height / 2) - (watermark.height() / 2);
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break;
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case 6:
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x = width - watermark.width();
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y = (page_height / 2) - (watermark.height() / 2);
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break;
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case 8:
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x = (width / 2) - (watermark.width() / 2);
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y = page_height - watermark.height();
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break;
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case 9:
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x = width - watermark.width();
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y = page_height - watermark.height();
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break;
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}
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vector<VImage> img;
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int addedHeight = 0;
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VImage contentAlpha;
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VImage frameAlpha;
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VImage bg;
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VImage frame;
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for (int i = 0; i < n_pages; i++) {
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VImage img_frame =
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type == "gif" ? in.crop(0, i * page_height, width, page_height) : in;
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if (append) {
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VImage appended = img_frame.join(watermark, VIPS_DIRECTION_VERTICAL,
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VImage::option()->set("expand", true));
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addedHeight = watermark.height();
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img.push_back(appended);
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} else if (mc) {
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VImage padded =
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img_frame.embed(0, 0, width, page_height + 15,
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VImage::option()->set("background", 0xffffff));
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VImage composited =
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padded.composite2(watermark, VIPS_BLEND_MODE_OVER,
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VImage::option()
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->set("x", width - 190)
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->set("y", padded.height() - 22));
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addedHeight = 15;
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img.push_back(composited);
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} else {
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VImage composited;
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if (alpha) {
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if (i == 0) {
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contentAlpha = watermark.extract_band(0).embed(
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x, y, width, page_height,
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VImage::option()->set("extend", "white"));
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frameAlpha = watermark.extract_band(1).embed(
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x, y, width, page_height,
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VImage::option()->set("extend", "black"));
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bg =
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frameAlpha.new_from_image({0, 0, 0}).copy(VImage::option()->set(
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"interpretation", VIPS_INTERPRETATION_sRGB));
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frame = bg.bandjoin(frameAlpha);
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if (type == "jpg" || type == "jpeg") {
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type = "png";
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}
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}
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VImage content =
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img_frame.extract_band(0, VImage::option()->set("n", 3))
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.bandjoin(contentAlpha & img_frame.extract_band(3));
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composited =
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content.composite2(frame, VIPS_BLEND_MODE_OVER,
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VImage::option()->set("x", x)->set("y", y));
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} else {
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composited =
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img_frame.composite2(watermark, VIPS_BLEND_MODE_OVER,
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VImage::option()->set("x", x)->set("y", y));
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}
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img.push_back(composited);
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}
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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 + addedHeight);
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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) : 0);
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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>::Copy(env, (char *)buf, 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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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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