// SPDX-License-Identifier: Apache-2.0
// ----------------------------------------------------------------------------
// Copyright 2011-2021 Arm Limited
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy
// of the License at:
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations
// under the License.
// ----------------------------------------------------------------------------
#include <utility>
/**
* @brief Functions for color unquantization.
*/
#include "astcenc_internal.h"
/**
* @brief Un-blue-contract a color.
*
* This function reverses any applied blue contraction.
*
* @param input The input color that has been blue-contracted.
*
* @return The uncontracted color.
*/
static ASTCENC_SIMD_INLINE vint4 uncontract_color(
vint4 input
) {
vmask4 mask(true, true, false, false);
vint4 bc0 = asr<1>(input + input.lane<2>());
return select(input, bc0, mask);
}
/**
* @brief Unpack an LDR RGBA color that uses delta encoding.
*
* @param input0 The packed endpoint 0 color.
* @param input1 The packed endpoint 1 color deltas.
* @param[out] output0 The unpacked endpoint 0 color.
* @param[out] output1 The unpacked endpoint 1 color.
*/
static void rgba_delta_unpack(
vint4 input0,
vint4 input1,
vint4& output0,
vint4& output1
) {
// Apply bit transfer
bit_transfer_signed(input1, input0);
// Apply blue-uncontraction if needed
int rgb_sum = hadd_rgb_s(input1);
input1 = input1 + input0;
if (rgb_sum < 0)
{
input0 = uncontract_color(input0);
input1 = uncontract_color(input1);
std::swap(input0, input1);
}
output0 = clamp(0, 255, input0);
output1 = clamp(0, 255, input1);
}
/**
* @brief Unpack an LDR RGB color that uses delta encoding.
*
* Output alpha set to 255.
*
* @param input0 The packed endpoint 0 color.
* @param input1 The packed endpoint 1 color deltas.
* @param[out] output0 The unpacked endpoint 0 color.
* @param[out] output1 The unpacked endpoint 1 color.
*/
static void rgb_delta_unpack(
vint4 input0,
vint4 input1,
vint4& output0,
vint4& output1
) {
rgba_delta_unpack(input0, input1, output0, output1);
output0.set_lane<3>(255);
output1.set_lane<3>(255);
}
/**
* @brief Unpack an LDR RGBA color that uses direct encoding.
*
* @param input0 The packed endpoint 0 color.
* @param input1 The packed endpoint 1 color.
* @param[out] output0 The unpacked endpoint 0 color.
* @param[out] output1 The unpacked endpoint 1 color.
*/
static void rgba_unpack(
vint4 input0,
vint4 input1,
vint4& output0,
vint4& output1
) {
// Apply blue-uncontraction if needed
if (hadd_rgb_s(input0) > hadd_rgb_s(input1))
{
input0 = uncontract_color(input0);
input1 = uncontract_color(input1);
std::swap(input0, input1);
}
output0 = input0;
output1 = input1;
}
/**
* @brief Unpack an LDR RGB color that uses direct encoding.
*
* Output alpha set to 255.
*
* @param input0 The packed endpoint 0 color.
* @param input1 The packed endpoint 1 color.
* @param[out] output0 The unpacked endpoint 0 color.
* @param[out] output1 The unpacked endpoint 1 color.
*/
static void rgb_unpack(
vint4 input0,
vint4 input1,
vint4& output0,
vint4& output1
) {
rgba_unpack(input0, input1, output0, output1);
output0.set_lane<3>(255);
output1.set_lane<3>(255);
}
/**
* @brief Unpack an LDR RGBA color that uses scaled encoding.
*
* Note only the RGB channels use the scaled encoding, alpha uses direct.
*
* @param input0 The packed endpoint 0 color.
* @param alpha1 The packed endpoint 1 alpha value.
* @param scale The packed quantized scale.
* @param[out] output0 The unpacked endpoint 0 color.
* @param[out] output1 The unpacked endpoint 1 color.
*/
static void rgb_scale_alpha_unpack(
vint4 input0,
uint8_t alpha1,
uint8_t scale,
vint4& output0,
vint4& output1
) {
output1 = input0;
output1.set_lane<3>(alpha1);
output0 = asr<8>(input0 * scale);
output0.set_lane<3>(input0.lane<3>());
}
/**
* @brief Unpack an LDR RGB color that uses scaled encoding.
*
* Output alpha is 255.
*
* @param input0 The packed endpoint 0 color.
* @param scale The packed scale.
* @param[out] output0 The unpacked endpoint 0 color.
* @param[out] output1 The unpacked endpoint 1 color.
*/
static void rgb_scale_unpack(
vint4 input0,
int scale,
vint4& output0,
vint4& output1
) {
output1 = input0;
output1.set_lane<3>(255);
output0 = asr<8>(input0 * scale);
output0.set_lane<3>(255);
}
/**
* @brief Unpack an LDR L color that uses direct encoding.
*
* Output alpha is 255.
*
* @param input The packed endpoints.
* @param[out] output0 The unpacked endpoint 0 color.
* @param[out] output1 The unpacked endpoint 1 color.
*/
static void luminance_unpack(
const uint8_t input[2],
vint4& output0,
vint4& output1
) {
int lum0 = input[0];
int lum1 = input[1];
output0 = vint4(lum0, lum0, lum0, 255);
output1 = vint4(lum1, lum1, lum1, 255);
}
/**
* @brief Unpack an LDR L color that uses delta encoding.
*
* Output alpha is 255.
*
* @param input The packed endpoints (L0, L1).
* @param[out] output0 The unpacked endpoint 0 color.
* @param[out] output1 The unpacked endpoint 1 color.
*/
static void luminance_delta_unpack(
const uint8_t input[2],
vint4& output0,
vint4& output1
) {
int v0 = input[0];
int v1 = input[1];
int l0 = (v0 >> 2) | (v1 & 0xC0);
int l1 = l0 + (v1 & 0x3F);
l1 = astc::min(l1, 255);
output0 = vint4(l0, l0, l0, 255);
output1 = vint4(l1, l1, l1, 255);
}
/**
* @brief Unpack an LDR LA color that uses direct encoding.
*
* @param input The packed endpoints (L0, L1, A0, A1).
* @param[out] output0 The unpacked endpoint 0 color.
* @param[out] output1 The unpacked endpoint 1 color.
*/
static void luminance_alpha_unpack(
const uint8_t input[4],
vint4& output0,
vint4& output1
) {
int lum0 = input[0];
int lum1 = input[1];
int alpha0 = input[2];
int alpha1 = input[3];
output0 = vint4(lum0, lum0, lum0, alpha0);
output1 = vint4(lum1, lum1, lum1, alpha1);
}
/**
* @brief Unpack an LDR LA color that uses delta encoding.
*
* @param input The packed endpoints (L0, L1, A0, A1).
* @param[out] output0 The unpacked endpoint 0 color.
* @param[out] output1 The unpacked endpoint 1 color.
*/
static void luminance_alpha_delta_unpack(
const uint8_t input[4],
vint4& output0,
vint4& output1
) {
int lum0 = input[0];
int lum1 = input[1];
int alpha0 = input[2];
int alpha1 = input[3];
lum0 |= (lum1 & 0x80) << 1;
alpha0 |= (alpha1 & 0x80) << 1;
lum1 &= 0x7F;
alpha1 &= 0x7F;
if (lum1 & 0x40)
{
lum1 -= 0x80;
}
if (alpha1 & 0x40)
{
alpha1 -= 0x80;
}
lum0 >>= 1;
lum1 >>= 1;
alpha0 >>= 1;
alpha1 >>= 1;
lum1 += lum0;
alpha1 += alpha0;
lum1 = astc::clamp(lum1, 0, 255);
alpha1 = astc::clamp(alpha1, 0, 255);
output0 = vint4(lum0, lum0, lum0, alpha0);
output1 = vint4(lum1, lum1, lum1, alpha1);
}
/**
* @brief Unpack an HDR RGB + offset encoding.
*
* @param input The packed endpoints (packed and modal).
* @param[out] output0 The unpacked endpoint 0 color.
* @param[out] output1 The unpacked endpoint 1 color.
*/
static void hdr_rgbo_unpack(
const uint8_t input[4],
vint4& output0,
vint4& output1
) {
int v0 = input[0];
int v1 = input[1];
int v2 = input[2];
int v3 = input[3];
int modeval = ((v0 & 0xC0) >> 6) | (((v1 & 0x80) >> 7) << 2) | (((v2 & 0x80) >> 7) << 3);
int majcomp;
int mode;
if ((modeval & 0xC) != 0xC)
{
majcomp = modeval >> 2;
mode = modeval & 3;
}
else if (modeval != 0xF)
{
majcomp = modeval & 3;
mode = 4;
}
else
{
majcomp = 0;
mode = 5;
}
int red = v0 & 0x3F;
int green = v1 & 0x1F;
int blue = v2 & 0x1F;
int scale = v3 & 0x1F;
int bit0 = (v1 >> 6) & 1;
int bit1 = (v1 >> 5) & 1;
int bit2 = (v2 >> 6) & 1;
int bit3 = (v2 >> 5) & 1;
int bit4 = (v3 >> 7) & 1;
int bit5 = (v3 >> 6) & 1;
int bit6 = (v3 >> 5) & 1;
int ohcomp = 1 << mode;
if (ohcomp & 0x30)
green |= bit0 << 6;
if (ohcomp & 0x3A)
green |= bit1 << 5;
if (ohcomp & 0x30)
blue |= bit2 << 6;
if (ohcomp & 0x3A)
blue |= bit3 << 5;
if (ohcomp & 0x3D)
scale |= bit6 << 5;
if (ohcomp & 0x2D)
scale |= bit5 << 6;
if (ohcomp & 0x04)
scale |= bit4 << 7;
if (ohcomp & 0x3B)
red |= bit4 << 6;
if (ohcomp & 0x04)
red |= bit3 << 6;
if (ohcomp & 0x10)
red |= bit5 << 7;
if (ohcomp & 0x0F)
red |= bit2 << 7;
if (ohcomp & 0x05)
red |= bit1 << 8;
if (ohcomp & 0x0A)
red |= bit0 << 8;
if (ohcomp & 0x05)
red |= bit0 << 9;
if (ohcomp & 0x02)
red |= bit6 << 9;
if (ohcomp & 0x01)
red |= bit3 << 10;
if (ohcomp & 0x02)
red |= bit5 << 10;
// expand to 12 bits.
static const int shamts[6] { 1, 1, 2, 3, 4, 5 };
int shamt = shamts[mode];
red <<= shamt;
green <<= shamt;
blue <<= shamt;
scale <<= shamt;
// on modes 0 to 4, the values stored for "green" and "blue" are differentials,
// not absolute values.
if (mode != 5)
{
green = red - green;
blue = red - blue;
}
// switch around components.
int temp;
switch (majcomp)
{
case 1:
temp = red;
red = green;
green = temp;
break;
case 2:
temp = red;
red = blue;
blue = temp;
break;
default:
break;
}
int red0 = red - scale;
int green0 = green - scale;
int blue0 = blue - scale;
// clamp to [0,0xFFF].
if (red < 0)
red = 0;
if (green < 0)
green = 0;
if (blue < 0)
blue = 0;
if (red0 < 0)
red0 = 0;
if (green0 < 0)
green0 = 0;
if (blue0 < 0)
blue0 = 0;
output0 = vint4(red0 << 4, green0 << 4, blue0 << 4, 0x7800);
output1 = vint4(red << 4, green << 4, blue << 4, 0x7800);
}
/**
* @brief Unpack an HDR RGB direct encoding.
*
* @param input The packed endpoints (packed and modal).
* @param[out] output0 The unpacked endpoint 0 color.
* @param[out] output1 The unpacked endpoint 1 color.
*/
static void hdr_rgb_unpack(
const uint8_t input[6],
vint4& output0,
vint4& output1
) {
int v0 = input[0];
int v1 = input[1];
int v2 = input[2];
int v3 = input[3];
int v4 = input[4];
int v5 = input[5];
// extract all the fixed-placement bitfields
int modeval = ((v1 & 0x80) >> 7) | (((v2 & 0x80) >> 7) << 1) | (((v3 & 0x80) >> 7) << 2);
int majcomp = ((v4 & 0x80) >> 7) | (((v5 & 0x80) >> 7) << 1);
if (majcomp == 3)
{
output0 = vint4(v0 << 8, v2 << 8, (v4 & 0x7F) << 9, 0x7800);
output1 = vint4(v1 << 8, v3 << 8, (v5 & 0x7F) << 9, 0x7800);
return;
}
int a = v0 | ((v1 & 0x40) << 2);
int b0 = v2 & 0x3f;
int b1 = v3 & 0x3f;
int c = v1 & 0x3f;
int d0 = v4 & 0x7f;
int d1 = v5 & 0x7f;
// get hold of the number of bits in 'd0' and 'd1'
static const int dbits_tab[8] { 7, 6, 7, 6, 5, 6, 5, 6 };
int dbits = dbits_tab[modeval];
// extract six variable-placement bits
int bit0 = (v2 >> 6) & 1;
int bit1 = (v3 >> 6) & 1;
int bit2 = (v4 >> 6) & 1;
int bit3 = (v5 >> 6) & 1;
int bit4 = (v4 >> 5) & 1;
int bit5 = (v5 >> 5) & 1;
// and prepend the variable-placement bits depending on mode.
int ohmod = 1 << modeval; // one-hot-mode
if (ohmod & 0xA4)
a |= bit0 << 9;
if (ohmod & 0x8)
a |= bit2 << 9;
if (ohmod & 0x50)
a |= bit4 << 9;
if (ohmod & 0x50)
a |= bit5 << 10;
if (ohmod & 0xA0)
a |= bit1 << 10;
if (ohmod & 0xC0)
a |= bit2 << 11;
if (ohmod & 0x4)
c |= bit1 << 6;
if (ohmod & 0xE8)
c |= bit3 << 6;
if (ohmod & 0x20)
c |= bit2 << 7;
if (ohmod & 0x5B)
{
b0 |= bit0 << 6;
b1 |= bit1 << 6;
}
if (ohmod & 0x12)
{
b0 |= bit2 << 7;
b1 |= bit3 << 7;
}
if (ohmod & 0xAF)
{
d0 |= bit4 << 5;
d1 |= bit5 << 5;
}
if (ohmod & 0x5)
{
d0 |= bit2 << 6;
d1 |= bit3 << 6;
}
// sign-extend 'd0' and 'd1'
// note: this code assumes that signed right-shift actually sign-fills, not zero-fills.
int32_t d0x = d0;
int32_t d1x = d1;
int sx_shamt = 32 - dbits;
d0x <<= sx_shamt;
d0x >>= sx_shamt;
d1x <<= sx_shamt;
d1x >>= sx_shamt;
d0 = d0x;
d1 = d1x;
// expand all values to 12 bits, with left-shift as needed.
int val_shamt = (modeval >> 1) ^ 3;
a <<= val_shamt;
b0 <<= val_shamt;
b1 <<= val_shamt;
c <<= val_shamt;
d0 <<= val_shamt;
d1 <<= val_shamt;
// then compute the actual color values.
int red1 = a;
int green1 = a - b0;
int blue1 = a - b1;
int red0 = a - c;
int green0 = a - b0 - c - d0;
int blue0 = a - b1 - c - d1;
// clamp the color components to [0,2^12 - 1]
red0 = astc::clamp(red0, 0, 4095);
green0 = astc::clamp(green0, 0, 4095);
blue0 = astc::clamp(blue0, 0, 4095);
red1 = astc::clamp(red1, 0, 4095);
green1 = astc::clamp(green1, 0, 4095);
blue1 = astc::clamp(blue1, 0, 4095);
// switch around the color components
int temp0, temp1;
switch (majcomp)
{
case 1: // switch around red and green
temp0 = red0;
temp1 = red1;
red0 = green0;
red1 = green1;
green0 = temp0;
green1 = temp1;
break;
case 2: // switch around red and blue
temp0 = red0;
temp1 = red1;
red0 = blue0;
red1 = blue1;
blue0 = temp0;
blue1 = temp1;
break;
case 0: // no switch
break;
}
output0 = vint4(red0 << 4, green0 << 4, blue0 << 4, 0x7800);
output1 = vint4(red1 << 4, green1 << 4, blue1 << 4, 0x7800);
}
/**
* @brief Unpack an HDR RGB + LDR A direct encoding.
*
* @param input The packed endpoints (packed and modal).
* @param[out] output0 The unpacked endpoint 0 color.
* @param[out] output1 The unpacked endpoint 1 color.
*/
static void hdr_rgb_ldr_alpha_unpack(
const uint8_t input[8],
vint4& output0,
vint4& output1
) {
hdr_rgb_unpack(input, output0, output1);
int v6 = input[6];
int v7 = input[7];
output0.set_lane<3>(v6);
output1.set_lane<3>(v7);
}
/**
* @brief Unpack an HDR L (small range) direct encoding.
*
* @param input The packed endpoints (packed and modal).
* @param[out] output0 The unpacked endpoint 0 color.
* @param[out] output1 The unpacked endpoint 1 color.
*/
static void hdr_luminance_small_range_unpack(
const uint8_t input[2],
vint4& output0,
vint4& output1
) {
int v0 = input[0];
int v1 = input[1];
int y0, y1;
if (v0 & 0x80)
{
y0 = ((v1 & 0xE0) << 4) | ((v0 & 0x7F) << 2);
y1 = (v1 & 0x1F) << 2;
}
else
{
y0 = ((v1 & 0xF0) << 4) | ((v0 & 0x7F) << 1);
y1 = (v1 & 0xF) << 1;
}
y1 += y0;
if (y1 > 0xFFF)
{
y1 = 0xFFF;
}
output0 = vint4(y0 << 4, y0 << 4, y0 << 4, 0x7800);
output1 = vint4(y1 << 4, y1 << 4, y1 << 4, 0x7800);
}
/**
* @brief Unpack an HDR L (large range) direct encoding.
*
* @param input The packed endpoints (packed and modal).
* @param[out] output0 The unpacked endpoint 0 color.
* @param[out] output1 The unpacked endpoint 1 color.
*/
static void hdr_luminance_large_range_unpack(
const uint8_t input[2],
vint4& output0,
vint4& output1
) {
int v0 = input[0];
int v1 = input[1];
int y0, y1;
if (v1 >= v0)
{
y0 = v0 << 4;
y1 = v1 << 4;
}
else
{
y0 = (v1 << 4) + 8;
y1 = (v0 << 4) - 8;
}
output0 = vint4(y0 << 4, y0 << 4, y0 << 4, 0x7800);
output1 = vint4(y1 << 4, y1 << 4, y1 << 4, 0x7800);
}
/**
* @brief Unpack an HDR A direct encoding.
*
* @param input The packed endpoints (packed and modal).
* @param[out] output0 The unpacked endpoint 0 color.
* @param[out] output1 The unpacked endpoint 1 color.
*/
static void hdr_alpha_unpack(
const uint8_t input[2],
int& output0,
int& output1
) {
int v6 = input[0];
int v7 = input[1];
int selector = ((v6 >> 7) & 1) | ((v7 >> 6) & 2);
v6 &= 0x7F;
v7 &= 0x7F;
if (selector == 3)
{
output0 = v6 << 5;
output1 = v7 << 5;
}
else
{
v6 |= (v7 << (selector + 1)) & 0x780;
v7 &= (0x3f >> selector);
v7 ^= 32 >> selector;
v7 -= 32 >> selector;
v6 <<= (4 - selector);
v7 <<= (4 - selector);
v7 += v6;
if (v7 < 0)
{
v7 = 0;
}
else if (v7 > 0xFFF)
{
v7 = 0xFFF;
}
output0 = v6;
output1 = v7;
}
output0 <<= 4;
output1 <<= 4;
}
/**
* @brief Unpack an HDR RGBA direct encoding.
*
* @param input The packed endpoints (packed and modal).
* @param[out] output0 The unpacked endpoint 0 color.
* @param[out] output1 The unpacked endpoint 1 color.
*/
static void hdr_rgb_hdr_alpha_unpack(
const uint8_t input[8],
vint4& output0,
vint4& output1
) {
hdr_rgb_unpack(input, output0, output1);
int alpha0, alpha1;
hdr_alpha_unpack(input + 6, alpha0, alpha1);
output0.set_lane<3>(alpha0);
output1.set_lane<3>(alpha1);
}
/* See header for documentation. */
void unpack_color_endpoints(
astcenc_profile decode_mode,
int format,
const uint8_t* input,
bool& rgb_hdr,
bool& alpha_hdr,
vint4& output0,
vint4& output1
) {
// Assume no NaNs and LDR endpoints unless set later
rgb_hdr = false;
alpha_hdr = false;
bool alpha_hdr_default = false;
switch (format)
{
case FMT_LUMINANCE:
luminance_unpack(input, output0, output1);
break;
case FMT_LUMINANCE_DELTA:
luminance_delta_unpack(input, output0, output1);
break;
case FMT_HDR_LUMINANCE_SMALL_RANGE:
rgb_hdr = true;
alpha_hdr_default = true;
hdr_luminance_small_range_unpack(input, output0, output1);
break;
case FMT_HDR_LUMINANCE_LARGE_RANGE:
rgb_hdr = true;
alpha_hdr_default = true;
hdr_luminance_large_range_unpack(input, output0, output1);
break;
case FMT_LUMINANCE_ALPHA:
luminance_alpha_unpack(input, output0, output1);
break;
case FMT_LUMINANCE_ALPHA_DELTA:
luminance_alpha_delta_unpack(input, output0, output1);
break;
case FMT_RGB_SCALE:
{
vint4 input0q(input[0], input[1], input[2], 0);
uint8_t scale = input[3];
rgb_scale_unpack(input0q, scale, output0, output1);
}
break;
case FMT_RGB_SCALE_ALPHA:
{
vint4 input0q(input[0], input[1], input[2], input[4]);
uint8_t alpha1q = input[5];
uint8_t scaleq = input[3];
rgb_scale_alpha_unpack(input0q, alpha1q, scaleq, output0, output1);
}
break;
case FMT_HDR_RGB_SCALE:
rgb_hdr = true;
alpha_hdr_default = true;
hdr_rgbo_unpack(input, output0, output1);
break;
case FMT_RGB:
{
vint4 input0q(input[0], input[2], input[4], 0);
vint4 input1q(input[1], input[3], input[5], 0);
rgb_unpack(input0q, input1q, output0, output1);
}
break;
case FMT_RGB_DELTA:
{
vint4 input0q(input[0], input[2], input[4], 0);
vint4 input1q(input[1], input[3], input[5], 0);
rgb_delta_unpack(input0q, input1q, output0, output1);
}
break;
case FMT_HDR_RGB:
rgb_hdr = true;
alpha_hdr_default = true;
hdr_rgb_unpack(input, output0, output1);
break;
case FMT_RGBA:
{
vint4 input0q(input[0], input[2], input[4], input[6]);
vint4 input1q(input[1], input[3], input[5], input[7]);
rgba_unpack(input0q, input1q, output0, output1);
}
break;
case FMT_RGBA_DELTA:
{
vint4 input0q(input[0], input[2], input[4], input[6]);
vint4 input1q(input[1], input[3], input[5], input[7]);
rgba_delta_unpack(input0q, input1q, output0, output1);
}
break;
case FMT_HDR_RGB_LDR_ALPHA:
rgb_hdr = true;
hdr_rgb_ldr_alpha_unpack(input, output0, output1);
break;
case FMT_HDR_RGBA:
rgb_hdr = true;
alpha_hdr = true;
hdr_rgb_hdr_alpha_unpack(input, output0, output1);
break;
}
// Assign a correct default alpha
if (alpha_hdr_default)
{
if (decode_mode == ASTCENC_PRF_HDR)
{
output0.set_lane<3>(0x7800);
output1.set_lane<3>(0x7800);
alpha_hdr = true;
}
else
{
output0.set_lane<3>(0x00FF);
output1.set_lane<3>(0x00FF);
alpha_hdr = false;
}
}
vint4 ldr_scale(257);
vint4 hdr_scale(1);
vint4 output_scale = ldr_scale;
// An LDR profile image
if ((decode_mode == ASTCENC_PRF_LDR) ||
(decode_mode == ASTCENC_PRF_LDR_SRGB))
{
// Also matches HDR alpha, as cannot have HDR alpha without HDR RGB
if (rgb_hdr == true)
{
output0 = vint4(0xFF00, 0x0000, 0xFF00, 0xFF00);
output1 = vint4(0xFF00, 0x0000, 0xFF00, 0xFF00);
output_scale = hdr_scale;
rgb_hdr = false;
alpha_hdr = false;
}
}
// An HDR profile image
else
{
vmask4 hdr_lanes(rgb_hdr, rgb_hdr, rgb_hdr, alpha_hdr);
output_scale = select(ldr_scale, hdr_scale, hdr_lanes);
}
output0 = output0 * output_scale;
output1 = output1 * output_scale;
}