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Add support for CD-I IFF images

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This commit is contained in:
Mirco Miranda
2026-01-08 17:49:01 +01:00
parent 8d7fb2c3fd
commit 8224c0099d
7 changed files with 822 additions and 21 deletions
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88
src/imageformats/iff.cpp
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@@ -262,14 +262,21 @@ static void addMetadata(QImage &img, const IFOR_Chunk *form)
// if no explicit resolution was found, apply the aspect ratio to the default one
if (!resChanged) {
auto headers = IFFChunk::searchT<BMHDChunk>(form);
if (!headers.isEmpty()) {
auto xr = headers.first()->xAspectRatio();
auto yr = headers.first()->yAspectRatio();
if (xr > 0 && yr > 0 && xr > yr) {
img.setDotsPerMeterX(img.dotsPerMeterX() * yr / xr);
} else if (xr > 0 && yr > 0 && xr < yr) {
img.setDotsPerMeterY(img.dotsPerMeterY() * xr / yr);
if (form->formType() == IMAG_FORM_TYPE) {
auto params = IFFChunk::searchT<IPARChunk>(form);
if (!params.isEmpty()) {
img.setDotsPerMeterY(img.dotsPerMeterY() * params.first()->aspectRatio());
}
} else {
auto headers = IFFChunk::searchT<BMHDChunk>(form);
if (!headers.isEmpty()) {
auto xr = headers.first()->xAspectRatio();
auto yr = headers.first()->yAspectRatio();
if (xr > 0 && yr > 0 && xr > yr) {
img.setDotsPerMeterX(img.dotsPerMeterX() * yr / xr);
} else if (xr > 0 && yr > 0 && xr < yr) {
img.setDotsPerMeterY(img.dotsPerMeterY() * xr / yr);
}
}
}
}
@@ -475,6 +482,67 @@ bool IFFHandler::readMayaImage(QImage *image)
return true;
}
bool IFFHandler::readCDIImage(QImage *image)
{
auto forms = d->searchForms<FORMChunk>();
if (forms.isEmpty()) {
return false;
}
auto cin = qBound(0, currentImageNumber(), int(forms.size() - 1));
auto &&form = forms.at(cin);
// show the first one (I don't have a sample with many images)
auto headers = IFFChunk::searchT<IHDRChunk>(form);
if (headers.isEmpty()) {
qCWarning(LOG_IFFPLUGIN) << "IFFHandler::readCDIImage(): no supported image found";
return false;
}
// create the image
auto &&header = headers.first();
auto img = imageAlloc(header->size(), form->format());
if (img.isNull()) {
qCWarning(LOG_IFFPLUGIN) << "IFFHandler::readCDIImage(): error while allocating the image";
return false;
}
// set the palette
if (img.format() == QImage::Format_Indexed8) {
auto pltes = IFFChunk::searchT<PLTEChunk>(form);
if (!pltes.isEmpty()) {
img.setColorTable(pltes.first()->palette());
}
}
// decoding the image
auto bodies = IFFChunk::searchT<IDATChunk>(form);
if (bodies.isEmpty()) {
img.fill(0);
} else {
auto &&body = bodies.first();
if (!body->resetStrideRead(device())) {
qCWarning(LOG_IFFPLUGIN) << "IFFHandler::readCDIImage(): error while reading image data";
return false;
}
auto pars = IFFChunk::searchT<IPARChunk>(form);
for (auto y = 0, h = img.height(); y < h; ++y) {
auto line = reinterpret_cast<char*>(img.scanLine(y));
auto ba = body->strideRead(device(), y, header, pars.isEmpty() ? nullptr : pars.first());
if (ba.isEmpty()) {
qCWarning(LOG_IFFPLUGIN) << "IFFHandler::readCDIImage(): error while reading image scanline";
return false;
}
memcpy(line, ba.constData(), std::min(img.bytesPerLine(), ba.size()));
}
}
// set metadata (including image resolution)
addMetadata(img, form);
*image = img;
return true;
}
bool IFFHandler::read(QImage *image)
{
if (!d->readStructure(device())) {
@@ -490,6 +558,10 @@ bool IFFHandler::read(QImage *image)
return true;
}
if (readCDIImage(image)) {
return true;
}
qCWarning(LOG_IFFPLUGIN) << "IFFHandler::read(): no supported image found";
return false;
}