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+[workspace] +members = [ + "src/qr_backend" +] +resolver = "2" diff --git a/dfx.json b/dfx.json new file mode 100644 index 0000000..36a8075 --- /dev/null +++ b/dfx.json @@ -0,0 +1,17 @@ +{ + "canisters": { + "qr_backend": { + "candid": "src/qr_backend/qr_backend.did", + "package": "qr_backend", + "type": "rust" + } + }, + "defaults": { + "build": { + "args": "", + "packtool": "" + } + }, + "output_env_file": ".env", + "version": 1 +} \ No newline at end of file diff --git a/src/qr_backend/Cargo.toml b/src/qr_backend/Cargo.toml new file mode 100644 index 0000000..6c50001 --- /dev/null +++ b/src/qr_backend/Cargo.toml @@ -0,0 +1,19 @@ +[package] +name = "qr_backend" +version = "0.1.0" +edition = "2021" + +# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html + +[lib] +crate-type = ["cdylib"] + +[dependencies] +anyhow = "1.0.79" +candid = "0.10" +colorgrad = "0.6.2" +ic-cdk = "0.12" +ic-cdk-timers = "0.6" # Feel free to remove this dependency if you don't need timers +image = { version = "0.24.8", features = ["png"], default-features = false } +qrcode-generator = "4.1.9" +serde = { version = "1.0.196", features = ["derive"] } diff --git a/src/qr_backend/qr_backend.did b/src/qr_backend/qr_backend.did new file mode 100644 index 0000000..cc5d6ac --- /dev/null +++ b/src/qr_backend/qr_backend.did @@ -0,0 +1,22 @@ +type Options = record + { + add_logo: bool; + add_gradient: bool; + add_transparency: opt bool; + }; + +type QRError = record + { + message: text; + }; + +type QRResult = variant + { + Image: blob; + Err: QRError; + } +service : + { + "qrcode_query": (input: text, options: Options) -> (QRResult) query; + "qrcode_update": (input: text, options: Options) -> (QRResult); + } diff --git a/src/qr_backend/src/assets/logo_transparent.png b/src/qr_backend/src/assets/logo_transparent.png new file mode 100644 index 0000000..5001e7b Binary files /dev/null and b/src/qr_backend/src/assets/logo_transparent.png differ diff --git a/src/qr_backend/src/assets/logo_white.png b/src/qr_backend/src/assets/logo_white.png new file mode 100644 index 0000000..9344d01 Binary files /dev/null and b/src/qr_backend/src/assets/logo_white.png differ diff --git a/src/qr_backend/src/core.rs b/src/qr_backend/src/core.rs new file mode 100644 index 0000000..5c1cc1c --- /dev/null +++ b/src/qr_backend/src/core.rs @@ -0,0 +1,95 @@ +use image::{imageops, ImageBuffer, Rgba}; +use qrcode_generator::QrCodeEcc; +use std::io::Cursor; + +use crate::Options; + +pub(super) fn generate(input: String, options: Options, logo: &[u8], image_size: usize) -> Result, anyhow::Error> + { + let mut qr = image::DynamicImage::ImageLuma8(qrcode_generator::to_image_buffer(input, QrCodeEcc::Quartile, image_size,)?).into_rgba8(); + + if options.add_transparency == Some(true) + { + make_transparent(&mut qr); + } + if options.add_logo + { + add_logo(&mut qr, logo); + } + if options.add_gradient + { + add_gradient(&mut qr); + } + + let mut result = vec![]; + qr.write_to(&mut Cursor::new(&mut result), image::ImageOutputFormat::Png)?; + Ok(result) + } + + fn make_transparent(qr: &mut ImageBuffer, Vec>) + { + for (_x, _y, pixel) in qr.enumerate_pixels_mut() + { + if pixel.0 == [255, 255, 255, 255] + { + *pixel = image::Rgba([255, 255, 255, 0]); + } + } + } + fn add_logo(qr: &mut ImageBuffer, Vec>, logo: &[u8]) + { + let image_size = qr.width().min(qr.height()) as usize; + let element_size = get_qr_element_size(qr); + + let mut logo_size = element_size; + + while logo_size +2 * element_size <= 5 * image_size /16 + { + logo_size += 2*element_size; + } + + let mut logo = image::io::Reader::new(Cursor::new(logo)).with_guessed_format().unwrap().decode().unwrap(); + + logo = logo.resize(logo_size as u32, logo_size as u32, imageops::FilterType::Lanczos3); + + imageops::replace(qr, &logo, ((image_size-logo_size)/2) as i64, ((image_size-logo_size)/2) as i64); + } + fn add_gradient(qr: &mut ImageBuffer, Vec>) + { + let image_size = qr.width().min(qr.height()) as usize; + let gradient = colorgrad::CustomGradient::new().colors(&[colorgrad::Color::from_rgba8(100, 0, 100, 255), colorgrad::Color::from_rgba8(30, 5, 60, 225)]).build().unwrap(); + let center = (image_size / 2) as u32; + for (x, y, pixel) in qr.enumerate_pixels_mut() + { + if pixel.0 == [0, 0, 0, 255] + { + let distance = x.abs_diff(center) + y.abs_diff(center); + let rgba = gradient.at(distance as f64 / image_size as f64).to_rgba8(); + *pixel = image::Rgba(rgba); + } + } + } + fn get_qr_element_size(qr: &mut ImageBuffer, Vec>) -> usize + { + const BLACK_PIXEL: [u8;4] = [0, 0, 0, 255]; + let size = qr.width().min(qr.height()); + let mut start = size; + for i in 0..size + { + if qr.get_pixel(i, i).0 == BLACK_PIXEL + { + start = i; + break; + } + } + let mut element_size = 1; + for i in 0..size-start + { + if qr.get_pixel(start+i, start+i).0 != BLACK_PIXEL + { + element_size = i; + break; + } + } + element_size as usize + } \ No newline at end of file diff --git a/src/qr_backend/src/lib.rs b/src/qr_backend/src/lib.rs new file mode 100644 index 0000000..480f66e --- /dev/null +++ b/src/qr_backend/src/lib.rs @@ -0,0 +1,64 @@ +use candid::{CandidType, Deserialize}; +use std::include_bytes; +mod core; + +const IMAGE_SIZE_IN_PIXEL: usize = 1024; +const LOGO_TRANSPARENT: &[u8] = include_bytes!("./assets/logo_transparent.png"); +const LOGO_WHITE: &[u8] = include_bytes!("./assets/logo_white.png"); +#[ic_cdk::query] +fn greet(name: String) -> String { + format!("Hello, {}!", name) +} + + +#[derive(CandidType, Deserialize)] +struct Options + { + add_logo:bool, + add_gradient:bool, + add_transparency: Option, + } + +#[derive(CandidType, Deserialize)] +struct QRError + { + message: String, + } + +#[derive(CandidType, Deserialize)] +enum QRResult + { + Image(Vec), + Err(QRError), + } + +fn qrcode(input: String, options: Options) -> QRResult + { + let logo = if options.add_transparency == Some(true) + { + LOGO_TRANSPARENT + } + else + { + LOGO_WHITE + }; + let result = match core::generate(input, options, logo, IMAGE_SIZE_IN_PIXEL) + { + Ok(blob) => QRResult::Image(blob), + Err(err) => QRResult::Err(QRError{message: err.to_string()}), + }; + ic_cdk::println!("Executed Instructions: {}", ic_cdk::api::performance_counter(0)); + result + } + +#[ic_cdk::update] +fn qrcode_update(input: String, options: Options) -> QRResult + { + qrcode(input, options) + } + +#[ic_cdk::query] +fn qrcode_query(input: String, options: Options) -> QRResult + { + qrcode(input, options) + } \ No newline at end of file