mrmBot-Matrix/natives/gamexplain.cc

71 lines
2.5 KiB
C++
Raw Normal View History

2020-07-16 14:33:35 +00:00
#include <napi.h>
#include <iostream>
2020-07-16 14:33:35 +00:00
#include <list>
#include <vips/vips8>
2020-07-16 14:33:35 +00:00
using namespace std;
using namespace vips;
2020-07-16 14:33:35 +00:00
Napi::Value Gamexplain(const Napi::CallbackInfo &info) {
Napi::Env env = info.Env();
2021-02-25 21:09:53 +00:00
try {
Napi::Object obj = info[0].As<Napi::Object>();
Napi::Buffer<char> data = obj.Get("data").As<Napi::Buffer<char>>();
string type = obj.Get("type").As<Napi::String>().Utf8Value();
string basePath = obj.Get("basePath").As<Napi::String>().Utf8Value();
int delay =
obj.Has("delay") ? obj.Get("delay").As<Napi::Number>().Int32Value() : 0;
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);
string assetPath = basePath + "assets/images/gamexplain.png";
VImage tmpl = VImage::new_from_file(assetPath.c_str());
2020-07-16 14:33:35 +00:00
int width = in.width();
int page_height = vips_image_get_page_height(in.get_image());
int n_pages = vips_image_get_n_pages(in.get_image());
2020-07-16 14:33:35 +00:00
vector<VImage> img;
for (int i = 0; i < n_pages; i++) {
VImage img_frame =
type == "gif" ? in.crop(0, i * page_height, width, page_height) : in;
VImage resized =
img_frame
.thumbnail_image(1181, VImage::option()
->set("height", 571)
->set("size", VIPS_SIZE_FORCE))
.embed(10, 92, 1200, 675,
VImage::option()->set("extend", "white"));
VImage composited = resized.composite2(tmpl, VIPS_BLEND_MODE_OVER);
img.push_back(composited);
}
VImage final = VImage::arrayjoin(img, VImage::option()->set("across", 1));
final.set(VIPS_META_PAGE_HEIGHT, 675);
if (delay) final.set("delay", delay);
void *buf;
size_t length;
final.write_to_buffer(
("." + type).c_str(), &buf, &length,
type == "gif" ? VImage::option()->set("dither", 0) : 0);
2020-07-16 14:33:35 +00:00
vips_thread_shutdown();
2020-07-16 14:33:35 +00:00
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");
}
2020-07-16 14:33:35 +00:00
}