X-Git-Url: http://git.shiar.net/sheet.git/blobdiff_plain/a142c8ca12f907b4775231207eeb5819ae76f30a..c106d1bc4d686595384f6b3d4cc2a28cbed70d1f:/codec.inc.pl

diff --git a/codec.inc.pl b/codec.inc.pl
index 2b1f590..f4d90e3 100644
--- a/codec.inc.pl
+++ b/codec.inc.pl
@@ -36,7 +36,7 @@ codec => {
 },
 feature => {
 	default => {
-		children => [qw( quality_photo quality_art speed limits features royalties )],
+		children => [qw( quality_photo quality_art speed limits features royalties overhead support )],
 	},
 	quality_photo => {
 		name => 'compression (photo)',
@@ -438,5 +438,33 @@ feature => {
 		},
 		children => [],
 	},
+	support => {
+		score => {
+			jpeg => 5,
+			gif  => 5,
+			png  => 5,
+			jp2k => [2, undef, 'Apple only'],
+			webp => [4, undef, 'modern browsers'],
+			heic => [1, undef, 'stored by latest cameras, no browser support'],
+			avif => [3, undef, 'all modern browsers except Safari and Edge'],
+			jxl  => [2, undef, 'upcoming in most browsers'],
+		},
+	},
+	overhead => {
+		name => 'container overhead (file size)',
+		score => {
+			png  => [3,  67, 'upto 70 bytes for specific RGBA'],
+			jpeg => [2, 160, '159 bytes minimum for gray, 288 for specific colours'],
+			gif  => [4,  35, '43 bytes for transparent'],
+			webp => [4,  34, 'black or transparent lossless; 44-92 bytes lossy'],
+			bpg  => [4,  31, 'lossy 29-62 bytes, lossless 37-160'],
+			flif => [5,  14, 'black or transparent; 20 bytes for specific RGBA'],
+			pnm  => [5,   8, 'monochrome text PBM; 12 bytes PPM; 69 bytes PAM'],
+			jxl  => [5,  12, '512×256 black pixels'],
+			avif => [1, 282, 'container overhead; 457 bytes with alpha'],
+			jp2k => [2, 123, 'experimental results, likely not optimal'],
+			heic => [1, 386],
+		},
+	},
 },
 }