Integrate JXL decoder

src/codecs/jxl/encoder-meta.ts

@@ -0,0 +1,72 @@
+export enum WebPImageHint {
+  WEBP_HINT_DEFAULT, // default preset.
+  WEBP_HINT_PICTURE, // digital picture, like portrait, inner shot
+  WEBP_HINT_PHOTO,   // outdoor photograph, with natural lighting
+  WEBP_HINT_GRAPH,   // Discrete tone image (graph, map-tile etc).
+}
+
+export interface EncodeOptions {
+  quality: number;
+  target_size: number;
+  target_PSNR: number;
+  method: number;
+  sns_strength: number;
+  filter_strength: number;
+  filter_sharpness: number;
+  filter_type: number;
+  partitions: number;
+  segments: number;
+  pass: number;
+  show_compressed: number;
+  preprocessing: number;
+  autofilter: number;
+  partition_limit: number;
+  alpha_compression: number;
+  alpha_filtering: number;
+  alpha_quality: number;
+  lossless: number;
+  exact: number;
+  image_hint: number;
+  emulate_jpeg_size: number;
+  thread_level: number;
+  low_memory: number;
+  near_lossless: number;
+  use_delta_palette: number;
+  use_sharp_yuv: number;
+}
+export interface EncoderState { type: typeof type; options: EncodeOptions; }
+
+export const type = 'webp';
+export const label = 'WebP';
+export const mimeType = 'image/webp';
+export const extension = 'webp';
+// These come from struct WebPConfig in encode.h.
+export const defaultOptions: EncodeOptions = {
+  quality: 75,
+  target_size: 0,
+  target_PSNR: 0,
+  method: 4,
+  sns_strength: 50,
+  filter_strength: 60,
+  filter_sharpness: 0,
+  filter_type: 1,
+  partitions: 0,
+  segments: 4,
+  pass: 1,
+  show_compressed: 0,
+  preprocessing: 0,
+  autofilter: 0,
+  partition_limit: 0,
+  alpha_compression: 1,
+  alpha_filtering: 1,
+  alpha_quality: 100,
+  lossless: 0,
+  exact: 0,
+  image_hint: 0,
+  emulate_jpeg_size: 0,
+  thread_level: 0,
+  low_memory: 0,
+  near_lossless: 100,
+  use_delta_palette: 0,
+  use_sharp_yuv: 0,
+};