Port meme
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natives/meme.cc
166
natives/meme.cc
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@ -1,11 +1,11 @@
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#include <Magick++.h>
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#include <napi.h>
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#include <iostream>
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#include <list>
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#include <vips/vips8>
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using namespace std;
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using namespace Magick;
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using namespace vips;
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Napi::Value Meme(const Napi::CallbackInfo &info) {
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Napi::Env env = info.Env();
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@ -20,88 +20,108 @@ Napi::Value Meme(const Napi::CallbackInfo &info) {
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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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Blob blob;
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VOption *options = VImage::option()->set("access", "sequential");
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list<Image> frames;
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list<Image> coalesced;
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list<Image> mid;
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Image top_text;
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Image bottom_text;
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try {
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readImages(&frames, Blob(data.Data(), data.Length()));
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} catch (Magick::WarningCoder &warning) {
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cerr << "Coder Warning: " << warning.what() << endl;
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} catch (Magick::Warning &warning) {
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cerr << "Warning: " << warning.what() << endl;
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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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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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int size = width / 9;
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int rad = 1;
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string font_string = (font == "roboto" ? "Roboto Condensed" : font) + " " +
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(font != "impact" ? "bold" : "normal") + " " +
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to_string(size);
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VImage mask = VImage::black(rad * 2 + 1, rad * 2 + 1) + 128;
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mask.draw_circle({255}, rad, rad, rad, VImage::option()->set("fill", true));
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VImage topText;
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if (top != "") {
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VImage topIn = VImage::text(
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("<span foreground=\"white\">" + top + "</span>").c_str(),
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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", width));
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topIn = topIn.embed(rad + 10, rad + 10, (topIn.width() + 2 * rad) + 20,
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(topIn.height() + 2 * rad) + 20);
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VImage topOutline =
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topIn.morph(mask, VIPS_OPERATION_MORPHOLOGY_DILATE)
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.gaussblur(0.5, VImage::option()->set("min_ampl", 0.1));
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topOutline = (topOutline == (vector<double>){0, 0, 0, 0});
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VImage topInvert = topOutline.extract_band(3).invert();
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topOutline = topOutline
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.extract_band(0, VImage::option()->set(
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"n", topOutline.bands() - 1))
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.bandjoin(topInvert);
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topText = topOutline.composite2(topIn, VIPS_BLEND_MODE_OVER);
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}
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coalesceImages(&coalesced, frames.begin(), frames.end());
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int width = coalesced.front().columns();
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int dividedWidth = width / 1000;
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top_text.size(Geometry(to_string(width)));
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top_text.backgroundColor("none");
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top_text.font("Impact");
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top_text.fontPointsize(width / 12);
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top_text.textGravity(Magick::CenterGravity);
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top_text.read("pango:<span font_family=\"" +
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(font == "roboto" ? "Roboto Condensed" : font) +
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"\" weight=\"" + (font != "impact" ? "bold" : "normal") +
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"\" foreground='white'>" + top + "</span>");
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Image top_text_fill = top_text;
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top_text_fill.channel(Magick::AlphaChannel);
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top_text_fill.morphology(Magick::EdgeOutMorphology, "Octagon");
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top_text_fill.backgroundColor("black");
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top_text_fill.alphaChannel(Magick::ShapeAlphaChannel);
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if (dividedWidth > 1)
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top_text_fill.morphology(Magick::DilateMorphology, "Octagon",
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dividedWidth);
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top_text.composite(top_text_fill, Magick::CenterGravity,
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Magick::DstOverCompositeOp);
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VImage bottomText;
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if (bottom != "") {
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bottom_text.size(Geometry(to_string(coalesced.front().columns())));
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bottom_text.backgroundColor("none");
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bottom_text.font("Impact");
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bottom_text.fontPointsize(width / 12);
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bottom_text.textGravity(Magick::CenterGravity);
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bottom_text.read("pango:<span foreground='white'>" + bottom + "</span>");
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Image bottom_text_fill = bottom_text;
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bottom_text_fill.channel(Magick::AlphaChannel);
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bottom_text_fill.morphology(Magick::EdgeOutMorphology, "Octagon");
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bottom_text_fill.backgroundColor("black");
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bottom_text_fill.alphaChannel(Magick::ShapeAlphaChannel);
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if (dividedWidth > 1)
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bottom_text_fill.morphology(Magick::DilateMorphology, "Octagon",
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dividedWidth);
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bottom_text.composite(bottom_text_fill, Magick::CenterGravity,
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Magick::DstOverCompositeOp);
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VImage bottomIn = VImage::text(
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("<span foreground=\"white\">" + bottom + "</span>").c_str(),
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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", width));
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bottomIn =
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bottomIn.embed(rad + 10, rad + 10, (bottomIn.width() + 2 * rad) + 20,
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(bottomIn.height() + 2 * rad) + 20);
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VImage bottomOutline =
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bottomIn.morph(mask, VIPS_OPERATION_MORPHOLOGY_DILATE)
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.gaussblur(0.5, VImage::option()->set("min_ampl", 0.1));
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bottomOutline = (bottomOutline == (vector<double>){0, 0, 0, 0});
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VImage bottomInvert = bottomOutline.extract_band(3).invert();
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bottomOutline = bottomOutline
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.extract_band(0, VImage::option()->set(
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"n", bottomOutline.bands() - 1))
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.bandjoin(bottomInvert);
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bottomText = bottomOutline.composite2(bottomIn, VIPS_BLEND_MODE_OVER);
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}
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for (Image &image : coalesced) {
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image.composite(top_text, Magick::NorthGravity, Magick::OverCompositeOp);
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if (bottom != "")
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image.composite(bottom_text, Magick::SouthGravity,
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Magick::OverCompositeOp);
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image.magick(type);
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mid.push_back(image);
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}
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optimizeTransparency(mid.begin(), mid.end());
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if (type == "gif") {
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for (Image &image : mid) {
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image.quantizeDither(false);
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image.quantize();
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if (delay != 0) image.animationDelay(delay);
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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 =
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type == "gif" ? in.crop(0, i * page_height, width, page_height) : in;
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if (top != "") {
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img_frame = img_frame.composite2(
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topText, VIPS_BLEND_MODE_OVER,
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VImage::option()->set("x", (width / 2) - (topText.width() / 2)));
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}
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if (bottom != "") {
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img_frame = img_frame.composite2(
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bottomText, VIPS_BLEND_MODE_OVER,
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VImage::option()
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->set("x", (width / 2) - (bottomText.width() / 2))
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->set("y", page_height - bottomText.height()));
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}
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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, page_height);
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if (delay) final.set("delay", delay);
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writeImages(mid.begin(), mid.end(), &blob);
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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 *)blob.data(),
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blob.length()));
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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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