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Improve CMYK writing support

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Closes #11 

Requires MR !279

On formats that does not support CMYK and does not use the ScanLineConverter class during write operation, the CMYK images must be converted using the color space conversion functions of `QImage` (if ICC profile is valid).
This commit is contained in:
Mirco Miranda
2024-11-28 06:57:01 +00:00
parent b5d8b6638e
commit 374961dab4
18 changed files with 3328 additions and 7 deletions
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10
src/imageformats/tga.cpp
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@ -21,6 +21,7 @@
#include <assert.h>
#include <QColorSpace>
#include <QDataStream>
#include <QDebug>
#include <QImage>
@ -474,7 +475,14 @@ bool TGAHandler::write(const QImage &image)
QImage img(image);
const bool hasAlpha = img.hasAlphaChannel();
#if QT_VERSION >= QT_VERSION_CHECK(6, 8, 0)
auto cs = image.colorSpace();
if (cs.isValid() && cs.colorModel() == QColorSpace::ColorModel::Cmyk && image.format() == QImage::Format_CMYK8888) {
img = image.convertedToColorSpace(QColorSpace(QColorSpace::SRgb), QImage::Format_RGB32);
} else if (hasAlpha && img.format() != QImage::Format_ARGB32) {
#else
if (hasAlpha && img.format() != QImage::Format_ARGB32) {
#endif
img = img.convertToFormat(QImage::Format_ARGB32);
} else if (!hasAlpha && img.format() != QImage::Format_RGB32) {
img = img.convertToFormat(QImage::Format_RGB32);
@ -497,7 +505,7 @@ bool TGAHandler::write(const QImage &image)
s << quint8(hasAlpha ? originTopLeft + alphaChannel8Bits : originTopLeft); // top left image (0x20) + 8 bit alpha (0x8)
for (int y = 0; y < img.height(); y++) {
auto ptr = reinterpret_cast<QRgb *>(img.scanLine(y));
auto ptr = reinterpret_cast<const QRgb *>(img.constScanLine(y));
for (int x = 0; x < img.width(); x++) {
auto color = *(ptr + x);
s << quint8(qBlue(color));