mrmBot-Matrix/natives/motivate.cc

131 lines
4.8 KiB
C++

#include <napi.h>
#include <vips/vips8>
using namespace std;
using namespace vips;
Napi::Value Motivate(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 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();
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;
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;
VImage topImage;
if (top_text != "") {
string topText = "<span foreground=\"white\" background=\"black\">" +
top_text + "</span>";
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>";
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));
}
vector<VImage> img;
int height;
for (int i = 0; i < nPages; i++) {
VImage img_frame =
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),
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;
int sideAddition = pageHeight * 0.4;
VImage bordered3 = bordered2.embed(
sideAddition / 2, addition / 2, bordered2.width() + sideAddition,
bordered2.height() + addition,
VImage::option()->set("extend", "black"));
VImage frame;
if (top_text != "") {
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 != "") {
if (top_text == "") frame = bordered3;
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);
void *buf;
size_t length;
final.write_to_buffer(("." + type).c_str(), &buf, &length,
type == "gif" ? VImage::option()->set("dither", 1)
: 0);
result.Set("data", Napi::Buffer<char>::Copy(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;
}