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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
#include "hdrimage.h"
#include <QFile>
#include <QFileInfo>
#include <QDebug>
#include <cmath>
namespace QmlDesigner {
// Hdr loading code was copied from QtQuick3D and adapted to create QImage instead of texture.
typedef unsigned char RGBE[4];
#define R 0
#define G 1
#define B 2
#define E 3
constexpr float GAMMA = 1.f / 2.2f;
static QByteArray fileToByteArray(QString const &filename)
{
QFile file(filename);
QFileInfo info(file);
if (info.exists() && file.open(QFile::ReadOnly))
return file.readAll();
return {};
}
inline int calculateLine(int width, int bitdepth) { return ((width * bitdepth) + 7) / 8; }
inline int calculatePitch(int line) { return (line + 3) & ~3; }
float convertComponent(int exponent, int val)
{
float v = val / (256.0f);
float d = powf(2.0f, (float)exponent - 128.0f);
float converted = v * d;
// Apply gamma correction to brighten the image.
// This will approximately match the default (i.e. linear) tonemapping of SceneEnvironment
return powf(converted, GAMMA);
}
void decrunchScanline(const char *&p, const char *pEnd, RGBE *scanline, int w)
{
scanline[0][R] = *p++;
scanline[0][G] = *p++;
scanline[0][B] = *p++;
scanline[0][E] = *p++;
if (scanline[0][R] == 2 && scanline[0][G] == 2 && scanline[0][B] < 128) {
// new rle, the first pixel was a dummy
for (int channel = 0; channel < 4; ++channel) {
for (int x = 0; x < w && p < pEnd; ) {
unsigned char c = *p++;
if (c > 128) { // run
if (p < pEnd) {
int repCount = c & 127;
c = *p++;
while (repCount--)
scanline[x++][channel] = c;
}
} else { // not a run
while (c-- && p < pEnd)
scanline[x++][channel] = *p++;
}
}
}
} else {
// old rle
scanline[0][R] = 2;
int bitshift = 0;
int x = 1;
while (x < w && pEnd - p >= 4) {
scanline[x][R] = *p++;
scanline[x][G] = *p++;
scanline[x][B] = *p++;
scanline[x][E] = *p++;
if (scanline[x][R] == 1 && scanline[x][G] == 1 && scanline[x][B] == 1) { // run
int repCount = scanline[x][3] << bitshift;
while (repCount--) {
memcpy(scanline[x], scanline[x - 1], 4);
++x;
}
bitshift += 8;
} else { // not a run
++x;
bitshift = 0;
}
}
}
}
void decodeScanlineToImageData(RGBE *scanline, int width, void *outBuf, quint32 offset)
{
quint8 *target = reinterpret_cast<quint8 *>(outBuf);
target += offset;
float rgbaF32[4];
for (int i = 0; i < width; ++i) {
rgbaF32[R] = convertComponent(scanline[i][E], scanline[i][R]);
rgbaF32[G] = convertComponent(scanline[i][E], scanline[i][G]);
rgbaF32[B] = convertComponent(scanline[i][E], scanline[i][B]);
rgbaF32[E] = 1.0f;
quint8 *dst = target + i * 4;
auto getColor = [](float src) -> quint8 {
const float srcColor = (src > 1.0f) ? 1.0f : src;
return quint8(srcColor * 255.0f);
};
dst[0] = getColor(rgbaF32[B]);
dst[1] = getColor(rgbaF32[G]);
dst[2] = getColor(rgbaF32[R]);
dst[3] = 255;
}
}
HdrImage::HdrImage(const QString &fileName)
: m_fileName(fileName)
{
loadHdr();
}
QPixmap HdrImage::toPixmap() const
{
// Copy is used to ensure pixmap will be valid after HdrImage goes out of scope
return QPixmap::fromImage(m_image, Qt::NoFormatConversion).copy();
}
void HdrImage::loadHdr()
{
QByteArray buf(fileToByteArray(m_fileName));
auto handleError = [this](const QString &error) {
qWarning() << QStringLiteral("Failed to load HDR image '%1': %2.").arg(m_fileName, error).toUtf8();
};
if (buf.isEmpty()) {
handleError("File open failed");
return;
}
if (!buf.startsWith(QByteArrayLiteral("#?RADIANCE\n"))) {
handleError("Non-HDR file");
return;
}
const char *p = buf.constData();
const char *pEnd = p + buf.size();
// Process lines until the empty one.
QByteArray line;
QByteArray formatTag {"FORMAT="};
QByteArray formatId {"32-bit_rle_rgbe"};
while (p < pEnd) {
char c = *p++;
if (c == '\n') {
if (line.isEmpty())
break;
if (line.startsWith(formatTag)) {
const QByteArray format = line.mid(7).trimmed();
if (format != formatId) {
handleError(QStringLiteral("Unsupported HDR format '%1'")
.arg(QString::fromUtf8(format)));
return;
}
}
line.clear();
} else {
line.append(c);
}
}
if (p == pEnd) {
handleError("Malformed HDR image data at property strings");
return;
}
// Get the resolution string.
while (p < pEnd) {
char c = *p++;
if (c == '\n')
break;
line.append(c);
}
if (p == pEnd) {
handleError("Malformed HDR image data at resolution string");
return;
}
int width = 0;
int height = 0;
// We only care about the standard orientation
if (!::sscanf(line.constData(), "-Y %d +X %d", &height, &width)) {
handleError(QStringLiteral("Unsupported HDR resolution string '%1'")
.arg(QString::fromUtf8(line)));
return;
}
if (width <= 0 || height <= 0) {
handleError("Invalid HDR resolution");
return;
}
const int bytesPerPixel = 4;
const int bitCount = bytesPerPixel * 8;
const int pitch = calculatePitch(calculateLine(width, bitCount));
const int dataSize = int(height * pitch);
m_buf = QByteArray {dataSize, 0};
// Allocate a scanline worth of RGBE data
RGBE *scanline = new RGBE[width];
for (int y = 0; y < height; ++y) {
quint32 byteOffset = quint32(y * width * bytesPerPixel);
if (pEnd - p < 4) {
handleError("Unexpected end of HDR data");
delete[] scanline;
return;
}
decrunchScanline(p, pEnd, scanline, width);
decodeScanlineToImageData(scanline, width, m_buf.data(), byteOffset);
}
delete[] scanline;
m_image = QImage {reinterpret_cast<const uchar *>(m_buf.constData()), width, height, pitch,
QImage::Format_ARGB32};
}
} // namespace QmlDesigner
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