feat(imaging): add pure-Rust Skia backend (#112)

crates/libremetaverse-imaging-skia/tests/fixtures/README.md

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+# Rust codec fixtures
+
+The tests decode these hexadecimal files into their exact checked-in bytes; no
+image is generated while tests run. Unless noted below, fixtures come from the
+BSD-3-Clause Skia test resources vendored by `skia-bindings 0.99.0`.
+
+| Fixture | SHA-256 |
+| --- | --- |
+| `alpha.webp` | `8b09993d8ffc9a9ec4e7f5f26a1c126cf265c37b0d63c0c5be2506e20dbc6fea` |
+| `animated.webp` | `292753f066add623af1e30bbeeca58f15b3d6d1052e12b13e30f21f8d3c14505` |
+| `baseline.jpg` | `4e45048dbe3078943eb364221a9757df9b9845b80e795ccdc944f1c18b5e221b` |
+| `bottom-up.bmp` | `d9cc5fff9e8e351727ad4519236ae46eaf37f8007dad5cdb8619fcd67ec68903` |
+| `gray-alpha.png` | `377a67510b4ccc74cdcce14847b02035e75ccab36e9d8e00586c4c24d1ae385a` |
+| `gray.png` | `85b19fcda452d6cbf02f570c353cfa9e47c29237f2fc8f0114deb6cd0b23f97a` |
+| `interlaced-palette.png` | `6283a61b1f7344c0cfa741076d6aed4a16a6bc5582e81db8dd7374a34230b0df` |
+| `palette-offset.gif` | `32d3409a79b75614ef385354d54f148f08856f8e9ce0d55054582ff7f40f4461` |
+| `progressive.jpg` | `d07a9815dc792543c16b796ec7729c19d6a29e7d9b4d0bbab50f4ef210be7767` |
+| `rgb.png` | `ecea1ef4a001a999ce9b82d18abf47401eb92998708b306b6c9a8ac3a6a9a2c8` |
+| `rgba.png` | `756a03364c02e3c9f85d6f4029eb3cef2488c081dc537d46e102bebcb9e02732` |
+| `straight-alpha.png` | `5a647404fa5289da777b1bb9e1dcfe20027262f992a214f38efaecc3da0e08a4` |
+
+`lossy-red.webp` was produced once with FFmpeg 5.1.8/libwebp from a solid
+8x8 red source (`-c:v libwebp -lossless 0 -quality 80`) and has SHA-256
+`7e3aaf1a442b6e69f7706ee5afe0aeacb2d096e384dbb63e792421fe2449cfe8`.
+
+The remaining tiny BMP, ICO, WBMP, and lossless RGB WebP files are original
+MetaCrate byte-level fixtures. Their reviewed bytes are intentionally readable
+in the `.hex` files and exercise header fields, row layout, masks, multi-byte
+integers, and multi-entry selection directly.

crates/libremetaverse-imaging-skia/tests/fixtures/alpha.webp.hex

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+524946461e000000574542505650384c110000002f0000001007d0fffef7
+bf7f8188e87f0000
+

crates/libremetaverse-imaging-skia/tests/fixtures/animated.webp.hex

@@ -0,0 +1,12 @@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crates/libremetaverse-imaging-skia/tests/fixtures/baseline.jpg.hex

@@ -0,0 +1,11 @@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crates/libremetaverse-imaging-skia/tests/fixtures/bgrx32.bmp.hex

@@ -0,0 +1,2 @@
+424d3e000000000000003600000028000000020000000100000001002000000000000800000000000000000000000000000000000000
+0000ff0000ff0000

crates/libremetaverse-imaging-skia/tests/fixtures/bottom-up.bmp.hex

@@ -0,0 +1,10 @@
+424df6000000000000003600000028000000080000000800000001001800
+00000000c0000000130b0000130b000000000000000000002272b0f8232e
+d989f03857b32260a8fe403371fe95df716a63fea76b954ce022bce472b2
+4a9f121345e342373d0a19bd98ac6f271d9411e45f83b2fb996ed8629116
+8c1271b4ca39f93d27831ab4c312f867abcc184203a7b97d481082b44afe
+5221c5d6cc78abb4dc7dd209f300ca475d60b26f44466e5742f73ba8028f
+df09557e02c78aaa24966c888154628936400ea6bdb61dc088d62bd46293
+b241c6decea5ba6e60f34b8f70a5bb5d5f39395ce266761927ba3cb0fcde
+7438c19300fa
+

crates/libremetaverse-imaging-skia/tests/fixtures/gray-alpha.png.hex

@@ -0,0 +1,5 @@
+89504e470d0a1a0a0000000d4948445200000020000000200804000000d9
+73b27f0000000467414d41000186a031e8965f0000003549444154488963
+fccfc0c001859c683431229c2cdf1928032c3f86be01a361301a06543160
+341047c3802a068c06e2681850c30000df2a207da0bf7158000000004945
+4e44ae426082

crates/libremetaverse-imaging-skia/tests/fixtures/gray.png.hex

@@ -0,0 +1,5 @@
+89504e470d0a1a0a0000000d494844520000002000000020080000000056
+1125280000000467414d41000186a031e8965f0000004149444154388d63
+646024001408c8b30c05058c0f0829f8f71f3f6079301c1430ca11906764
+a2795c0c06058c8ff0cafeffcff887e67131181430cae0956564040050e5
+fe7171a90b240000000049454e44ae426082

crates/libremetaverse-imaging-skia/tests/fixtures/interlaced-palette.png.hex

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+89504e470d0a1a0a0000000d49484452000000200000002001030000013e
+b3d82100000006504c5445eeff222266ff6c1ad226000000294944415408
+d7636080820f50b80a0a43d1b0b131c39933d849088348363f1040880f40
+00212810030009ba422d1cbe5f9a0000000049454e44ae426082
+

crates/libremetaverse-imaging-skia/tests/fixtures/lossy-red.webp.hex

@@ -0,0 +1,4 @@
+524946463c000000574542505650382030000000d001009d012a08000800
+01402625a00274ba01f80003b000fef36997fe6c0ae6b9f7fbffe9707e97
+07e9707fe9480000
+

crates/libremetaverse-imaging-skia/tests/fixtures/multi.ico.hex

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+000001000200
+01010000010020002c00000026000000
+02020000010020003800000052000000
+28000000010000000200000001002000000000000400000000000000000000000000000000000000
+0000ffff
+28000000020000000400000001002000000000001000000000000000000000000000000000000000
+ff0000ffffffffff0000ffff00ff00ff
+

crates/libremetaverse-imaging-skia/tests/fixtures/multibyte.wbmp.hex

@@ -0,0 +1,3 @@
+0000810201
+ffffffffffffffffffffffffffffffff80
+

crates/libremetaverse-imaging-skia/tests/fixtures/palette-offset.gif.hex

@@ -0,0 +1,7 @@
+474946383961040002008400000000001000002000003000004000005000
+00600000700000800000900000a00000b00000c00000d00000e00000f000
+000000000000110000220000330000440000550000660000770000880000
+990000aa0000bb0000cc0000dd0000ee0000ff21f904000a0000002c0000
+00000400020000070908090a0b0c0d0e0f810021f9040114001a002c0100
+0100030001000007041f1a1581003b
+

crates/libremetaverse-imaging-skia/tests/fixtures/progressive.jpg.hex

@@ -0,0 +1,26 @@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crates/libremetaverse-imaging-skia/tests/fixtures/rgb-lossless.webp.hex

@@ -0,0 +1,2 @@
+524946461c000000574542505650384c0f0000002f014000000710f58ffe
+0722a2ff0100

crates/libremetaverse-imaging-skia/tests/fixtures/rgb.png.hex

@@ -0,0 +1,5 @@
+89504e470d0a1a0a0000000d4948445200000020000000200802000000fc
+18eda30000000467414d41000186a031e8965f00000048494441544889ed
+d5c10900300c024085ec91fdb772133b442bf4a1f8cee12bb40d043b800a
+14f81ca0ede47d4c784081020f4a871fc284071428f0a0743823a94081bb
+7077a3c00182b1f95e3ed793980000000049454e44ae426082

crates/libremetaverse-imaging-skia/tests/fixtures/rgb555.bmp.hex

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+424d3a000000000000003600000028000000020000000100000001001000000000000400000000000000000000000000000000000000
+007ce003

crates/libremetaverse-imaging-skia/tests/fixtures/rgba.png.hex

@@ -0,0 +1,7 @@
+89504e470d0a1a0a0000000d494844520000002000000020080600000073
+7a7af40000000467414d41000186a031e8965f0000006f494441545885ed
+d6310a80300c46e12764684fa1f73f55048f21c4ddc545781d52e85028fc
+1f4d28d98a01305e7b7e9cffba33831d75054703ca06a8f90d58a0074e35
+1e227d805c8254e31bb0420f5cdc2e0079208892ffe2a00136a07b400794
+3c1004d900195036407f011bf00052201a9cd68fe9670000000049454e44
+ae426082

crates/libremetaverse-imaging-skia/tests/fixtures/small.wbmp.hex

@@ -0,0 +1 @@
+000002028040

crates/libremetaverse-imaging-skia/tests/fixtures/straight-alpha.png.hex

@@ -0,0 +1,6 @@
+89504e470d0a1a0a0000000d49484452000000010000000108060000001f
+15c489000000017352474200aece1ce900000006624b474400ff00ff00ff
+a0bda793000000097048597300000b1300000b1301009a9c180000000774
+494d4507de040313163ac721af9d0000001974455874436f6d6d656e7400
+4372656174656420776974682047494d5057810e170000000d4944415408
+d763f8ffff7f3d00097b037d178855c50000000049454e44ae426082

crates/libremetaverse-imaging-skia/tests/fixtures/two-by-two-bottom-up.bmp.hex

@@ -0,0 +1,3 @@
+424d46000000000000003600000028000000020000000200000001001800000000001000000000000000000000000000000000000000
+ff0000ffffff00000000ff00ff000000
+

crates/libremetaverse-imaging-skia/tests/fixtures/two-by-two-top-down.bmp.hex

@@ -0,0 +1,3 @@
+424d4600000000000000360000002800000002000000feffffff01001800000000001000000000000000000000000000000000000000
+0000ff00ff000000ff0000ffffff0000
+