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tav: ictcp decoding fix

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minjaesong
2025-10-02 20:20:11 +09:00
parent 0666734c9d
commit d4fae0071b
4 changed files with 55 additions and 31 deletions
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40
tsvm_core/src/net/torvald/tsvm/GraphicsJSR223Delegate.kt
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@@ -4965,24 +4965,34 @@ class GraphicsJSR223Delegate(private val vm: VM) {
for (x in 0 until width) {
val idx = y * width + x
// ICtCp to RGB conversion (BT.2100 -> sRGB)
val I = iData[idx]
val Ct = ctData[idx]
val Cp = cpData[idx]
// ICtCp to sRGB conversion (adapted from encoder ICtCp functions)
val I = iData[idx].toDouble() / 255.0
val Ct = (ctData[idx].toDouble() - 127.5) / 255.0
val Cp = (cpData[idx].toDouble() - 127.5) / 255.0
// ICtCp to LMS
val L = I + 0.00975f * Ct + 0.20524f * Cp
val M = I - 0.11387f * Ct + 0.13321f * Cp
val S = I + 0.03259f * Ct - 0.67851f * Cp
// ICtCp -> L'M'S' (inverse matrix)
val Lp = I + 0.015718580108730416 * Ct + 0.2095810681164055 * Cp
val Mp = I - 0.015718580108730416 * Ct - 0.20958106811640548 * Cp
val Sp = I + 1.0212710798422344 * Ct - 0.6052744909924316 * Cp
// LMS to RGB (simplified conversion)
val r = 3.2406f * L - 1.5372f * M - 0.4986f * S
val g = -0.9689f * L + 1.8758f * M + 0.0415f * S
val b = 0.0557f * L - 0.2040f * M + 1.0570f * S
// HLG decode: L'M'S' -> linear LMS
val L = HLG_EOTF(Lp)
val M = HLG_EOTF(Mp)
val S = HLG_EOTF(Sp)
rowRgbBuffer[bufferIdx++] = (r * 255f).toInt().coerceIn(0, 255).toByte()
rowRgbBuffer[bufferIdx++] = (g * 255f).toInt().coerceIn(0, 255).toByte()
rowRgbBuffer[bufferIdx++] = (b * 255f).toInt().coerceIn(0, 255).toByte()
// LMS -> linear sRGB (inverse matrix)
val rLin = 6.1723815689243215 * L -5.319534979827695 * M + 0.14699442094633924 * S
val gLin = -1.3243428148026244 * L + 2.560286104841917 * M -0.2359203727576164 * S
val bLin = -0.011819739235953752 * L -0.26473549971186555 * M + 1.2767952602537955 * S
// Gamma encode to sRGB
val rSrgb = srgbUnlinearise(rLin)
val gSrgb = srgbUnlinearise(gLin)
val bSrgb = srgbUnlinearise(bLin)
rowRgbBuffer[bufferIdx++] = (rSrgb * 255.0).toInt().coerceIn(0, 255).toByte()
rowRgbBuffer[bufferIdx++] = (gSrgb * 255.0).toInt().coerceIn(0, 255).toByte()
rowRgbBuffer[bufferIdx++] = (bSrgb * 255.0).toInt().coerceIn(0, 255).toByte()
}
// OPTIMISATION: Bulk copy entire row at once