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dithering on the encoder

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This commit is contained in:
minjaesong
2022-05-01 18:59:53 +09:00
parent 0e8dda5e90
commit 5eb2d77269
1 changed files with 14 additions and 8 deletions
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22
assets/disk0/encodeipf.js
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@@ -77,7 +77,9 @@ if (!exec_args[2]) {
return 1
}
let configUseAlpha = !(exec_args[3].toLowerCase() == "/noalpha")
let configUseAlpha = !(exec_args[3] != undefined && exec_args[3].toLowerCase() == "/noalpha")
let pattern = 0
filesystem.open("A", exec_args[1], "R")
@@ -129,7 +131,7 @@ let bayerKernels = [
12,4,14,6,
3,11,1,9,
]
].map(it => { it.map(it => { (it + 0.5) / 16 }) })
].map(it => it.map(it => (it + 0.5) / 16))
function chromaToFourBits(f) {
let r = Math.round(f * 8) + 7
@@ -145,18 +147,22 @@ for (let blockX = 0; blockX < Math.ceil(imgw / 4.0); blockX++) {
let cos = new Float32Array(16)
let cgs = new Float32Array(16)
// TODO 4x4 bayer dither
for (let py = 0; py < 4; py++) { for (let px = 0; px < 4; px++) {
// TODO oob-check
let ox = blockX * 4 + px
let oy = blockY * 4 + py
let t = bayerKernels[pattern % bayerKernels.length][4 * (py % 4) + (px % 4)]
let offset = channels * (oy * imgw + ox)
let r = sys.peek(imageData + offset) / 255.0
let g = sys.peek(imageData + offset+1) / 255.0
let b = sys.peek(imageData + offset+2) / 255.0
let a = (hasAlpha) ? sys.peek(imageData + offset+3) / 255.0 : 1.0
let r0 = sys.peek(imageData + offset) / 255.0
let g0 = sys.peek(imageData + offset+1) / 255.0
let b0 = sys.peek(imageData + offset+2) / 255.0
let a0 = (hasAlpha) ? sys.peek(imageData + offset+3) / 255.0 : 1.0
let r = Math.floor((t / 15 + r0) * 15) / 15
let g = Math.floor((t / 15 + g0) * 15) / 15
let b = Math.floor((t / 15 + b0) * 15) / 15
let a = Math.floor((t / 15 + a0) * 15) / 15
let co = r - b // [-1..1]
let tmp = b + co / 2.0