X-Git-Url: http://git.shiar.net/sheet.git/blobdiff_plain/c3ef3326d8ca3d9209afd34f6220f78b1eb0dbc2..004e069b46889f35372bc73615dc9a163a0f297b:/codec.inc.pl

diff --git a/codec.inc.pl b/codec.inc.pl
index 6b6b4e0..992c488 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 support )],
 	},
 	quality_photo => {
 		name => 'compression (photo)',
@@ -233,62 +233,42 @@ feature => {
 		parent => 'limits',
 		name => 'maximum image dimensions',
 		score => {
-			jpeg => 3,
-			gif  => 3,
-			png  => 4,
-			jp2k => 5,
-			webp => 1,
-			heic => 2,
-			avif => 3,
-			jxl  => 4,
-		},
-		data => {
-			jpeg => '65k²',  # 2**16
-			gif  => '65k²',  # 2**16
-			png  => '2G²',   # 2**31
-			jp2k => '4G²',   # 2**32
-			webp => '16k²',  # 2**14
-			heic => '8k×4k+', # 8193x4320
-			avif => '65k²+',  # 2**16, 8193x4320 with profile
-			jxl  => '1G²',   # 2**30
+			jpeg => [3, '65k²'],   # 2**16
+			gif  => [3, '65k²'],   # 2**16
+			png  => [4,  '2G²'],   # 2**31
+			jp2k => [5,  '4G²'],   # 2**32
+			webp => [1, '16k²'],   # 2**14
+			heic => [2,'8k×4k+', 'tilable, only 512×512 on Apple'], # 8193x4320
+			avif => [3, '65k²+', 'tilable, 7680×4320 with Advanced profile'], # 2**16
+			jxl  => [4,  '1G²'],   # 2**30
 		},
 	},
 	max_bitdepth => {
 		parent => 'limits',
 		name => 'precision (max. bit depth)',
 		score => {
-			jpeg => 2,
-			gif  => 2,
-			png  => 4,
-			jp2k => 5,
-			webp => 2,
-			heic => 3,
-			avif => 3,
-			jxl  => 5,
-		},
-		data => {
-			jpeg => 8,
-			gif  => 8,
-			png  => 16,
-			jp2k => 38,
-			webp => 8,
-			heic => 10,
-			avif => 10,
-			jxl  => 32,
+			jpeg => [2,  8],
+			gif  => [1,  8, '256 colour palette per frame'],
+			png  => [4, 16],
+			jp2k => [5, 38],
+			webp => [2,  8],
+			heic => [3, 10], #TODO 16?
+			avif => [3, 12, '8, 10, 12 bit'],
+			jxl  => [5, 32, '24-bit integer or 32-bit float'],
 		},
 	},
 	color_444 => {
 		parent => 'limits',
-		name => 'can do (lossy) 4:4:4',
+		name => 'chroma subsampling',
 		score => {
-			jpeg => 'y',
-			gif  => 'y',
-			png  => 'y',
+			jpeg => ['y', undef, '4:2:0, 4:2:2, 4:4:4'],
+			gif  => [4, '✘'],
+			png  => [4, '✘'],
 			jp2k => 'y',
-			webp => 'n',
-			heic => 'n',
-			avif => 'y',
-			jxl  => 'y',
+			webp => [1, '4:2:0'],
+			heic => [1, '4:2:0'],
+			avif => ['y', undef, '4:2:0, 4:2:2, 4:4:4'],
+			jxl  => ['y', undef, 'for JPEG compatibility'],
 		},
 	},
 	hdr => {
@@ -309,24 +289,14 @@ feature => {
 		parent => 'limits',
 		name => 'maximum number of channels',
 		score => {
-			jpeg => 2,
-			gif  => 1,
-			png  => 2,
-			jp2k => 5,
-			webp => 2,
-			heic => 3,
-			avif => 3,
-			jxl  => 4,
-		},
-		data => {
-			jpeg => 4, # cmyk
-			gif  => 3,
-			png  => 4, # cmyk
-			jp2k => 2**15,
-			webp => 4,
-			heic => 5,
-			avif => 5,
-			jxl  => 4099,
+			jpeg => [3, 4, 'RGB or CMYK'],
+			gif  => [3, 3, 'RGB palette'],
+			png  => [3, 4, 'RGBA'],
+			jp2k => [5, 2**15],
+			webp => [3, 4, 'RGBA'],
+			heic => [3, 3, 'RGB, separate alpha and depth'],
+			avif => [3, 3, 'RGB, separate alpha and depth'],
+			jxl  => [4, 4099, 'native XYB'],
 		},
 	},
 	features => {
@@ -346,20 +316,15 @@ feature => {
 		parent => 'features',
 		name => 'supports animation',
 		score => {
-			jpeg => 2,
+			jpeg => [2, 'MJPEG'],
 			gif  => 'y',
-			png  => 4,
-			jp2k => 2,
+			png  => [4, 'APNG', 'later backwards-compatible extension'],
+			jp2k => [2, 'MJP2'],
 			webp => 'y',
 			heic => 'y',
 			avif => 'y',
 			jxl  => 'y',
 		},
-		data => {
-			jpeg => 'MJPEG',
-			png  => 'APNG',
-			jp2k => 'MJP2',
-		},
 	},
 	progressive => {
 		parent => 'features',
@@ -380,7 +345,7 @@ feature => {
 		name => 'alpha transparency',
 		score => {
 			jpeg => 'n',
-			gif  => 3,
+			gif  => [3, '1 bit'],
 			png  => 'y',
 			jp2k => 'y',
 			webp => 'y',
@@ -388,9 +353,6 @@ feature => {
 			avif => 'y',
 			jxl  => 'y',
 		},
-		data => {
-			gif => '1 bit',
-		},
 	},
 	depthmap => {
 		parent => 'features',
@@ -447,10 +409,6 @@ feature => {
 			avif => 3,
 			jxl  => 4,
 		},
-		data => {
-			gif  => 'n/a',
-			png  => 'n/a',
-		},
 	},
 	compat_jpeg => {
 		parent => 'features',
@@ -465,23 +423,32 @@ feature => {
 			avif => 'n',
 			jxl  => 'y',
 		},
-		data => {
-			jpeg => 'n/a',
-		},
 	},
 	royalties => {
 		name => 'royalty-free',
 		score => {
 			jpeg => 5,
-			gif  => 5, # patents expired
+			gif  => [5, undef, 'patented before 2003'],
 			png  => 5,
-			jp2k => 3, # specs not freely available
-			webp => 4, # submarine risk
-			heic => 'n', # patents enforced
-			avif => 4,
-			jxl  => 4,
+			jp2k => [3, undef, 'ISO specification not freely available'],
+			webp => [4, undef, 'free format, low remaining risk of patent trolls'],
+			heic => ['n', undef, 'heavily patented'],
+			avif => [4, undef, 'free format, risk of patent trolls'],
+			jxl  => [4, undef, 'free format, risk of patent trolls'],
 		},
 		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'],
+		},
+	},
 },
 }