cvm-rs: allow setting JPEG quality from JS

cvm-rs/index.d.ts

@@ -9,6 +9,7 @@ interface JpegInputArgs {
 	height: number;
 	stride: number; // The width of your input framebuffer OR your image width (if encoding a full image)
 	buffer: Buffer;
+	quality: number;
 
 	// TODO: Allow different formats, or export a boxed ffi object which can store a format
 	// (i.e: new JpegEncoder(FORMAT_xxx)).
@@ -20,6 +21,7 @@ interface JpegResizeInputArgs {
 	desiredWidth: number; // dest width
 	desiredHeight: number; // dest height
 	buffer: Buffer; // source raw pixel buffer
+	quality: number;
 }
 
 /// Performs JPEG encoding.

cvm-rs/src/jpeg_js.rs

@@ -47,6 +47,7 @@ pub struct JpegInputArgs {
 	pub height: u32,
 	pub stride: u32,
 	pub buffer: napi::JsBuffer,
+	pub quality: u32,
 }
 
 #[napi(js_name = "jpegEncode")]
@@ -69,7 +70,7 @@ pub fn jpeg_encode(env: Env, input: JpegInputArgs) -> napi::Result<napi::JsObjec
 
 		let vec = COMPRESSOR.with(|lazy| {
 			let mut b = lazy.borrow_mut();
-			b.set_quality(35);
+			b.set_quality(input.quality);
 			b.set_subsamp(turbojpeg_sys::TJSAMP_TJSAMP_420);
 			b.compress_buffer(&image)
 		});
@@ -94,6 +95,7 @@ pub struct JpegResizeInputArgs {
 	pub desired_width: u32,
 	pub desired_height: u32,
 	pub buffer: napi::JsBuffer,
+	pub quality: u32,
 }
 
 #[napi(js_name = "jpegResizeEncode")]
@@ -136,7 +138,7 @@ pub fn jpeg_resize_and_encode(
 
 		let vec = COMPRESSOR.with(|lazy| {
 			let mut b = lazy.borrow_mut();
-			b.set_quality(35);
+			b.set_quality(input.quality);
 			b.set_subsamp(turbojpeg_sys::TJSAMP_TJSAMP_420);
 			b.compress_buffer(&image)
 		});

cvmts/src/JPEGEncoder.ts

@@ -20,7 +20,8 @@ export class JPEGEncoder {
 			width: rect.width,
 			height: rect.height,
 			stride: displaySize.width,
-			buffer: canvas.subarray(offset)
+			buffer: canvas.subarray(offset),
+			quality: gJpegQuality
 		});
 	}
 
@@ -30,7 +31,8 @@ export class JPEGEncoder {
 			height: size.height,
 			desiredWidth: kThumbnailSize.width,
 			desiredHeight: kThumbnailSize.height,
-			buffer: buffer
+			buffer: buffer,
+			quality: Math.floor(gJpegQuality / 1.5)
 		});
 	}
 }