mrmBot-Matrix/natives/motivate.cc

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#include <napi.h>
#include <vips/vips8>
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using namespace std;
using namespace vips;
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Napi::Value Motivate(const Napi::CallbackInfo &info) {
Napi::Env env = info.Env();
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try {
Napi::Object obj = info[0].As<Napi::Object>();
Napi::Buffer<char> data = obj.Get("data").As<Napi::Buffer<char>>();
string top_text = obj.Get("top").As<Napi::String>().Utf8Value();
string bottom_text = obj.Get("bottom").As<Napi::String>().Utf8Value();
string font = obj.Get("font").As<Napi::String>().Utf8Value();
string type = obj.Get("type").As<Napi::String>().Utf8Value();
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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 / 5;
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int pageHeight = vips_image_get_page_height(in.get_image());
int n_pages = vips_image_get_n_pages(in.get_image());
int textWidth = width - ((width / 25) * 2);
string font_string = font == "roboto" ? "Roboto Condensed" : font;
string topText = "<span foreground=\"white\" background=\"black\">" +
top_text + "</span>";
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VImage topImage = VImage::text(
topText.c_str(),
VImage::option()
->set("rgba", true)
->set("align", VIPS_ALIGN_CENTRE)
->set("font", (font_string + " " + to_string(size)).c_str())
->set("width", textWidth));
VImage bottomImage;
if (bottom_text != "") {
string bottomText = "<span foreground=\"white\" background=\"black\">" +
bottom_text + "</span>";
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bottomImage = VImage::text(
bottomText.c_str(),
VImage::option()
->set("rgba", true)
->set("align", VIPS_ALIGN_CENTRE)
->set("font", (font_string + " " + to_string(size * 0.4)).c_str())
->set("width", textWidth));
}
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vector<VImage> img;
int height;
for (int i = 0; i < n_pages; i++) {
VImage img_frame =
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type == "gif" ? in.crop(0, i * pageHeight, width, pageHeight) : in;
int borderSize = max(2, width / 66);
int borderSize2 = borderSize * 0.5;
VImage bordered =
img_frame.embed(borderSize, borderSize, width + (borderSize * 2),
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pageHeight + (borderSize * 2),
VImage::option()->set("extend", "black"));
VImage bordered2 = bordered.embed(
borderSize2, borderSize2, bordered.width() + (borderSize2 * 2),
bordered.height() + (borderSize2 * 2),
VImage::option()->set("extend", "white"));
int addition = width / 8;
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int sideAddition = pageHeight * 0.4;
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VImage bordered3 = bordered2.embed(
sideAddition / 2, addition / 2, bordered2.width() + sideAddition,
bordered2.height() + addition,
VImage::option()->set("extend", "black"));
VImage frame = bordered3.join(
topImage.gravity(VIPS_COMPASS_DIRECTION_NORTH, bordered3.width(),
topImage.height() + (size / 4),
VImage::option()->set("extend", "black")),
VIPS_DIRECTION_VERTICAL,
VImage::option()->set("background", 0x000000)->set("expand", true));
if (bottom_text != "") {
frame = frame.join(
bottomImage.gravity(VIPS_COMPASS_DIRECTION_NORTH, bordered3.width(),
bottomImage.height() + (size / 4),
VImage::option()->set("extend", "black")),
VIPS_DIRECTION_VERTICAL,
VImage::option()->set("background", 0x000000)->set("expand", true));
}
height = frame.height();
img.push_back(frame);
}
VImage final = VImage::arrayjoin(img, VImage::option()->set("across", 1))
.extract_band(0, VImage::option()->set("n", 3));
final.set(VIPS_META_PAGE_HEIGHT, height);
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void *buf;
size_t length;
final.write_to_buffer(
("." + type).c_str(), &buf, &length,
type == "gif" ? VImage::option()->set("dither", 1) : 0);
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Napi::Object result = Napi::Object::New(env);
result.Set("data", Napi::Buffer<char>::Copy(env, (char *)buf, length));
result.Set("type", type);
return result;
} catch (std::exception const &err) {
throw Napi::Error::New(env, err.what());
} catch (...) {
throw Napi::Error::New(env, "Unknown error");
}
}