Implement indexed png exporting
parent
7e0025846e
commit
b557272c04
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@ -8,7 +8,8 @@
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"name": "frontend",
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"version": "0.0.0",
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"dependencies": {
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"easy-crc": "^1.1.0",
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"buffer": "^6.0.3",
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"crc-32": "^1.2.2",
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"fflate": "^0.8.2"
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},
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"devDependencies": {
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@ -189,6 +190,25 @@
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"integrity": "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==",
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"dev": true
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},
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"node_modules/base64-js": {
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"version": "1.5.1",
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"resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.5.1.tgz",
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"integrity": "sha512-AKpaYlHn8t4SVbOHCy+b5+KKgvR4vrsD8vbvrbiQJps7fKDTkjkDry6ji0rUJjC0kzbNePLwzxq8iypo41qeWA==",
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"funding": [
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{
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"type": "github",
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"url": "https://github.com/sponsors/feross"
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},
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{
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"type": "patreon",
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"url": "https://www.patreon.com/feross"
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},
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{
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"type": "consulting",
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"url": "https://feross.org/support"
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}
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]
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},
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"node_modules/binary-extensions": {
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"version": "2.2.0",
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"resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.2.0.tgz",
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@ -220,6 +240,29 @@
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"node": ">=8"
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}
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},
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"node_modules/buffer": {
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"version": "6.0.3",
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"resolved": "https://registry.npmjs.org/buffer/-/buffer-6.0.3.tgz",
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"integrity": "sha512-FTiCpNxtwiZZHEZbcbTIcZjERVICn9yq/pDFkTl95/AxzD1naBctN7YO68riM/gLSDY7sdrMby8hofADYuuqOA==",
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"funding": [
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{
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"type": "github",
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"url": "https://github.com/sponsors/feross"
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},
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{
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"type": "patreon",
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"url": "https://www.patreon.com/feross"
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},
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{
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"type": "consulting",
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"url": "https://feross.org/support"
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}
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],
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"dependencies": {
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"base64-js": "^1.3.1",
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"ieee754": "^1.2.1"
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}
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},
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"node_modules/buffer-crc32": {
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"version": "0.2.13",
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"resolved": "https://registry.npmjs.org/buffer-crc32/-/buffer-crc32-0.2.13.tgz",
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@ -283,6 +326,17 @@
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"integrity": "sha512-/Srv4dswyQNBfohGpz9o6Yb3Gz3SrUDqBH5rTuhGR7ahtlbYKnVxw2bCFMRljaA7EXHaXZ8wsHdodFvbkhKmqg==",
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"dev": true
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},
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"node_modules/crc-32": {
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"version": "1.2.2",
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"resolved": "https://registry.npmjs.org/crc-32/-/crc-32-1.2.2.tgz",
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"integrity": "sha512-ROmzCKrTnOwybPcJApAA6WBWij23HVfGVNKqqrZpuyZOHqK2CwHSvpGuyt/UNNvaIjEd8X5IFGp4Mh+Ie1IHJQ==",
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"bin": {
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"crc32": "bin/crc32.njs"
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},
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"engines": {
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"node": ">=0.8"
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}
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},
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"node_modules/debug": {
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"version": "4.3.4",
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"resolved": "https://registry.npmjs.org/debug/-/debug-4.3.4.tgz",
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@ -318,11 +372,6 @@
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"node": ">=8"
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}
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},
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"node_modules/easy-crc": {
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"version": "1.1.0",
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"resolved": "https://registry.npmjs.org/easy-crc/-/easy-crc-1.1.0.tgz",
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"integrity": "sha512-cvtERLTu8mYt1pOVVekJ4E0VdwyuKgL+VAfE3LY+Lw762i9M1bSEikm6fyGD2grxOdBfI0HgOmSi3HQneKr33A=="
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},
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"node_modules/es6-promise": {
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"version": "3.3.1",
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"resolved": "https://registry.npmjs.org/es6-promise/-/es6-promise-3.3.1.tgz",
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@ -813,6 +862,25 @@
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"node": ">= 0.4"
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}
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},
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"node_modules/ieee754": {
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"version": "1.2.1",
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"resolved": "https://registry.npmjs.org/ieee754/-/ieee754-1.2.1.tgz",
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"integrity": "sha512-dcyqhDvX1C46lXZcVqCpK+FtMRQVdIMN6/Df5js2zouUsqG7I6sFxitIC+7KYK29KdXOLHdu9zL4sFnoVQnqaA==",
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"funding": [
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{
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"type": "github",
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"url": "https://github.com/sponsors/feross"
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},
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{
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"type": "patreon",
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"url": "https://www.patreon.com/feross"
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},
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{
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"type": "consulting",
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"url": "https://feross.org/support"
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}
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]
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},
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"node_modules/immutable": {
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"version": "4.3.5",
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"resolved": "https://registry.npmjs.org/immutable/-/immutable-4.3.5.tgz",
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@ -1680,6 +1748,11 @@
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"integrity": "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==",
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"dev": true
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},
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"base64-js": {
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"version": "1.5.1",
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"resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.5.1.tgz",
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"integrity": "sha512-AKpaYlHn8t4SVbOHCy+b5+KKgvR4vrsD8vbvrbiQJps7fKDTkjkDry6ji0rUJjC0kzbNePLwzxq8iypo41qeWA=="
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},
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"binary-extensions": {
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"version": "2.2.0",
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"resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.2.0.tgz",
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@ -1705,6 +1778,15 @@
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"fill-range": "^7.0.1"
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}
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},
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"buffer": {
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"version": "6.0.3",
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"resolved": "https://registry.npmjs.org/buffer/-/buffer-6.0.3.tgz",
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"integrity": "sha512-FTiCpNxtwiZZHEZbcbTIcZjERVICn9yq/pDFkTl95/AxzD1naBctN7YO68riM/gLSDY7sdrMby8hofADYuuqOA==",
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"requires": {
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"base64-js": "^1.3.1",
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"ieee754": "^1.2.1"
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}
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},
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"buffer-crc32": {
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"version": "0.2.13",
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"resolved": "https://registry.npmjs.org/buffer-crc32/-/buffer-crc32-0.2.13.tgz",
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@ -1754,6 +1836,11 @@
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"integrity": "sha512-/Srv4dswyQNBfohGpz9o6Yb3Gz3SrUDqBH5rTuhGR7ahtlbYKnVxw2bCFMRljaA7EXHaXZ8wsHdodFvbkhKmqg==",
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"dev": true
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},
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"crc-32": {
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"version": "1.2.2",
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"resolved": "https://registry.npmjs.org/crc-32/-/crc-32-1.2.2.tgz",
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"integrity": "sha512-ROmzCKrTnOwybPcJApAA6WBWij23HVfGVNKqqrZpuyZOHqK2CwHSvpGuyt/UNNvaIjEd8X5IFGp4Mh+Ie1IHJQ=="
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},
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"debug": {
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"version": "4.3.4",
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"resolved": "https://registry.npmjs.org/debug/-/debug-4.3.4.tgz",
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@ -1775,11 +1862,6 @@
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"integrity": "sha512-reYkTUJAZb9gUuZ2RvVCNhVHdg62RHnJ7WJl8ftMi4diZ6NWlciOzQN88pUhSELEwflJht4oQDv0F0BMlwaYtA==",
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"dev": true
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},
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"easy-crc": {
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"version": "1.1.0",
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"resolved": "https://registry.npmjs.org/easy-crc/-/easy-crc-1.1.0.tgz",
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"integrity": "sha512-cvtERLTu8mYt1pOVVekJ4E0VdwyuKgL+VAfE3LY+Lw762i9M1bSEikm6fyGD2grxOdBfI0HgOmSi3HQneKr33A=="
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},
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"es6-promise": {
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"version": "3.3.1",
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"resolved": "https://registry.npmjs.org/es6-promise/-/es6-promise-3.3.1.tgz",
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@ -2055,6 +2137,11 @@
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"function-bind": "^1.1.2"
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}
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},
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"ieee754": {
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"version": "1.2.1",
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"resolved": "https://registry.npmjs.org/ieee754/-/ieee754-1.2.1.tgz",
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"integrity": "sha512-dcyqhDvX1C46lXZcVqCpK+FtMRQVdIMN6/Df5js2zouUsqG7I6sFxitIC+7KYK29KdXOLHdu9zL4sFnoVQnqaA=="
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},
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"immutable": {
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"version": "4.3.5",
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"resolved": "https://registry.npmjs.org/immutable/-/immutable-4.3.5.tgz",
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@ -22,7 +22,8 @@
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"vite": "^3.0.7"
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},
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"dependencies": {
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"easy-crc": "^1.1.0",
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"buffer": "^6.0.3",
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"crc-32": "^1.2.2",
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"fflate": "^0.8.2"
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}
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}
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@ -1 +1 @@
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ca3651e79b25974c2fcf59de2912276b
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f001f3ad84549a4a16ef6303845139bd
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@ -1,6 +1,7 @@
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import type { PixelPosition } from "./shapes"
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import { unzlibSync, zlibSync } from 'fflate'
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import { crc32 } from 'easy-crc'
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import { zlibSync } from 'fflate'
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import * as crc32 from 'crc-32'
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import { Buffer } from 'buffer/'
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import { SaveFileBytes } from "../../wailsjs/go/main/App.js"
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/**
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@ -360,101 +361,98 @@ export class Canvas {
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})
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}
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throw new Error('indexed export not yet implemented')
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// Otherwise do some lazy indexed PNG generation. FIXME: This is ham-fisted and not the proper way to encode PNGs...
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return new Promise((resolve, reject) => {
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let out = Buffer.alloc(0)
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// Otherwise do some lazy indexed PNG generation.
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let out = Buffer.alloc(0)
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let buffer = Buffer.alloc(21)
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let bufferOffset = 0
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let chunkStart = 0
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let chunkEnd = 0
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// Write header
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buffer = Buffer.alloc(8)
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bufferOffset = buffer.writeUInt8(0x89, bufferOffset)
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bufferOffset = buffer.writeUInt8(0x50, bufferOffset)
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bufferOffset = buffer.writeUInt8(0x4E, bufferOffset)
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bufferOffset = buffer.writeUInt8(0x47, bufferOffset)
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bufferOffset = buffer.writeUInt8(0x0D, bufferOffset)
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bufferOffset = buffer.writeUInt8(0x0A, bufferOffset)
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bufferOffset = buffer.writeUInt8(0x1A, bufferOffset)
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bufferOffset = buffer.writeUInt8(0x0A, bufferOffset)
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out = Buffer.concat([out, buffer])
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// Chunk o'clock (length, type, data, crc. crc = network-order CRC-32 of type + data)
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// Write IHDR
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buffer = Buffer.alloc(12 + 13), bufferOffset = 0
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bufferOffset = buffer.writeUInt32BE(13, bufferOffset)
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chunkStart = bufferOffset
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bufferOffset += buffer.write('IHDR', bufferOffset, 'latin1')
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bufferOffset = buffer.writeUInt32BE(this.width, bufferOffset)
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bufferOffset = buffer.writeUInt32BE(this.height, bufferOffset)
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bufferOffset = buffer.writeUInt8(8, bufferOffset) // Indexed 8-bit depth for palette entries
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bufferOffset = buffer.writeUInt8(3, bufferOffset) // Color type of indexed
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bufferOffset = buffer.writeUInt8(0, bufferOffset) // Compression method DEFLATE
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bufferOffset = buffer.writeUInt8(0, bufferOffset) // Filter method of 0
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bufferOffset = buffer.writeUInt8(0, bufferOffset) // No interlace method
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chunkEnd = bufferOffset
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bufferOffset = buffer.writeUInt32BE(crc32('CRC-32', buffer.slice(chunkStart, chunkEnd)), bufferOffset)
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out = Buffer.concat([out, buffer])
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// TODO: Actually implement this code ripped from my own garbage encoder simple-indexed-png-encode.
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// Write PLTE
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/*let palettesSize = this.palette.length - this.palette.length/4
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buffer = Buffer.alloc(12 + palettesSize), bufferOffset = 0
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bufferOffset = buffer.writeUInt32BE(palettesSize, bufferOffset)
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chunkStart = bufferOffset
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bufferOffset += buffer.write('PLTE', bufferOffset, 'latin1')
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for (let i = 0; i < palettes.length; i++) {
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bufferOffset = buffer.writeUInt8(palettes[i++], bufferOffset) // R
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bufferOffset = buffer.writeUInt8(palettes[i++], bufferOffset) // G
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bufferOffset = buffer.writeUInt8(palettes[i++], bufferOffset) // B
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// Alpha is skipped.
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}
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chunkEnd = bufferOffset
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bufferOffset = buffer.writeUInt32BE(crc32('CRC-32', buffer.slice(chunkStart, chunkEnd)), bufferOffset)
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out = Buffer.concat([out, buffer])
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// Write tRNS
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palettesSize = palettes.length/4
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buffer = Buffer.alloc(12 + palettesSize), bufferOffset = 0
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bufferOffset = buffer.writeUInt32BE(palettesSize, bufferOffset)
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chunkStart = bufferOffset
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bufferOffset += buffer.write('tRNS', bufferOffset, 'latin1')
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for (let i = 3; i < palettes.length; i += 4) {
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bufferOffset = buffer.writeUInt8(palettes[i], bufferOffset) // A
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}
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chunkEnd = bufferOffset
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bufferOffset = buffer.writeUInt32BE(crc32('CRC-32', buffer.slice(chunkStart, chunkEnd)), bufferOffset)
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out = Buffer.concat([out, buffer])
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// Build our deflate data
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let data = Buffer.alloc(pixels.length + height)
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let dataOffset = 0
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for (let i = 0; i < height; i++) {
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dataOffset = data.writeUInt8(0, dataOffset) // No Filter
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for (let j = 0, end = width; j < end; j++) {
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dataOffset = data.writeUInt8(pixels[i*width+j], dataOffset)
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let buffer = Buffer.alloc(21)
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let bufferOffset = 0
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let chunkStart = 0
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let chunkEnd = 0
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// Write header
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buffer = Buffer.alloc(8)
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bufferOffset = buffer.writeUInt8(0x89, bufferOffset)
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bufferOffset = buffer.writeUInt8(0x50, bufferOffset)
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bufferOffset = buffer.writeUInt8(0x4E, bufferOffset)
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bufferOffset = buffer.writeUInt8(0x47, bufferOffset)
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bufferOffset = buffer.writeUInt8(0x0D, bufferOffset)
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bufferOffset = buffer.writeUInt8(0x0A, bufferOffset)
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bufferOffset = buffer.writeUInt8(0x1A, bufferOffset)
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bufferOffset = buffer.writeUInt8(0x0A, bufferOffset)
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out = Buffer.concat([out, buffer])
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// Chunk o'clock (length, type, data, crc. crc = network-order CRC-32 of type + data)
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// Write IHDR
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buffer = Buffer.alloc(12 + 13), bufferOffset = 0
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bufferOffset = buffer.writeUInt32BE(13, bufferOffset)
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chunkStart = bufferOffset
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bufferOffset += buffer.write('IHDR', bufferOffset)
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bufferOffset = buffer.writeUInt32BE(this.width, bufferOffset)
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bufferOffset = buffer.writeUInt32BE(this.height, bufferOffset)
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bufferOffset = buffer.writeUInt8(8, bufferOffset) // Indexed 8-bit depth for palette entries
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bufferOffset = buffer.writeUInt8(3, bufferOffset) // Color type of indexed
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bufferOffset = buffer.writeUInt8(0, bufferOffset) // Compression method DEFLATE
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bufferOffset = buffer.writeUInt8(0, bufferOffset) // Filter method of 0
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bufferOffset = buffer.writeUInt8(0, bufferOffset) // No interlace method
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chunkEnd = bufferOffset
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bufferOffset = buffer.writeInt32BE(crc32.buf(buffer.slice(chunkStart, chunkEnd)), bufferOffset)
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out = Buffer.concat([out, buffer])
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// Write PLTE
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let palettesSize = this.palette.length * 3
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buffer = Buffer.alloc(12 + palettesSize), bufferOffset = 0
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bufferOffset = buffer.writeUInt32BE(palettesSize, bufferOffset)
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chunkStart = bufferOffset
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bufferOffset += buffer.write('PLTE', bufferOffset)
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for (let i = 0; i < this.palette.length; i++) {
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bufferOffset = buffer.writeUInt8(this.palette[i] & 0xFF, bufferOffset)
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bufferOffset = buffer.writeUInt8((this.palette[i] >> 8) & 0xFF, bufferOffset)
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bufferOffset = buffer.writeUInt8((this.palette[i] >> 16) & 0xFF, bufferOffset)
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// Alpha is skipped.
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}
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}
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let deflatedData = await deflateAsync(data)
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// Write IDAT // Our DEFLATE and 0->raw scanline data
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buffer = Buffer.alloc(8), bufferOffset = 0
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bufferOffset = buffer.writeUInt32BE(deflatedData.length, bufferOffset)
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chunkStart = bufferOffset
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bufferOffset += buffer.write('IDAT', bufferOffset, 'latin1')
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buffer = Buffer.concat([buffer, deflatedData, Buffer.alloc(4)])
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bufferOffset = bufferOffset + deflatedData.length
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chunkEnd = bufferOffset
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bufferOffset = buffer.writeUInt32BE(crc32('CRC-32', buffer.slice(chunkStart, chunkEnd)), bufferOffset)
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out = Buffer.concat([out, buffer])
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// Write IEND
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buffer = Buffer.alloc(12), bufferOffset = 0
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bufferOffset = buffer.writeUInt32BE(0, bufferOffset)
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chunkStart = bufferOffset
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bufferOffset += buffer.write('IEND', bufferOffset, 'latin1')
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chunkEnd = bufferOffset
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bufferOffset = buffer.writeUInt32BE(crc32('CRC-32', buffer.slice(chunkStart, chunkEnd)), bufferOffset)
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out = Buffer.concat([out, buffer])*/
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chunkEnd = bufferOffset
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bufferOffset = buffer.writeInt32BE(crc32.buf(buffer.slice(chunkStart, chunkEnd)), bufferOffset)
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out = Buffer.concat([out, buffer])
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// Write tRNS
|
||||
palettesSize = this.palette.length
|
||||
buffer = Buffer.alloc(12 + palettesSize), bufferOffset = 0
|
||||
bufferOffset = buffer.writeUInt32BE(palettesSize, bufferOffset)
|
||||
chunkStart = bufferOffset
|
||||
bufferOffset += buffer.write('tRNS', bufferOffset)
|
||||
for (let i = 0; i < this.palette.length; i++) {
|
||||
bufferOffset = buffer.writeUInt8((this.palette[i] >> 24) & 0xFF, bufferOffset)
|
||||
}
|
||||
chunkEnd = bufferOffset
|
||||
bufferOffset = buffer.writeInt32BE(crc32.buf(buffer.slice(chunkStart, chunkEnd)), bufferOffset)
|
||||
out = Buffer.concat([out, buffer])
|
||||
// Build our deflate data
|
||||
let data = Buffer.alloc(this.pixels.length + this.height)
|
||||
let dataOffset = 0
|
||||
for (let i = 0; i < this.height; i++) {
|
||||
dataOffset = data.writeUInt8(0, dataOffset) // No Filter
|
||||
for (let j = 0, end = this.width; j < end; j++) {
|
||||
dataOffset = data.writeUInt8(this.pixels[i*this.width+j], dataOffset)
|
||||
}
|
||||
}
|
||||
//let deflatedData = deflateSync(data, {level: 9})
|
||||
let deflatedData = zlibSync(data, {level: 9})
|
||||
// Write IDAT // Our DEFLATE and 0->raw scanline data
|
||||
buffer = Buffer.alloc(8), bufferOffset = 0
|
||||
bufferOffset = buffer.writeUInt32BE(deflatedData.length, bufferOffset)
|
||||
chunkStart = bufferOffset
|
||||
bufferOffset += buffer.write('IDAT', bufferOffset)
|
||||
buffer = Buffer.concat([buffer, deflatedData, Buffer.alloc(4)])
|
||||
bufferOffset = bufferOffset + deflatedData.length
|
||||
chunkEnd = bufferOffset
|
||||
bufferOffset = buffer.writeInt32BE(crc32.buf(buffer.slice(chunkStart, chunkEnd)), bufferOffset)
|
||||
out = Buffer.concat([out, buffer])
|
||||
// Write IEND
|
||||
buffer = Buffer.alloc(12), bufferOffset = 0
|
||||
bufferOffset = buffer.writeUInt32BE(0, bufferOffset)
|
||||
chunkStart = bufferOffset
|
||||
bufferOffset += buffer.write('IEND', bufferOffset)
|
||||
chunkEnd = bufferOffset
|
||||
bufferOffset = buffer.writeInt32BE(crc32.buf(buffer.slice(chunkStart, chunkEnd)), bufferOffset)
|
||||
out = Buffer.concat([out, buffer])
|
||||
resolve(new Uint8Array(out))
|
||||
})
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue