I'm answering my own question.
In read_tiles() I have to use zEnd = 1 instead of 0.
Sorry for wasting your time.
haggi
Am 2019-10-08 12:30, schrieb ha...@haggi.de:
Hi,
I have a problem reading a tiled image on Windows with VisualStudio
and OIIO 2.0.8.
For testing I rendered an image with Arnold with tiled option checked
and without the tile option. While reading the scanline image works
fine, the tiled rendering does not read anything. I can see in debug
mode that the tilePixels array does not change at all before and after
reading a tile. The result of the read_tiles call is always true.
Maybe anyone can have a look and tell me if there is an obvious
problem.
This is the still bit chaotic code I use.
std::string filename = "C:/daten/images/tiledRender.exr";
auto in = ImageInput::open(filename);
if (in)
{
int tw = spec.tile_width;
int th = spec.tile_height;
int w = spec.width;
int h = spec.height;
int numBytesPerPixel = 3;
size_t numBytesPerImage = w*h*numBytesPerPixel;
size_t numBytesPerLine = w*numBytesPerPixel;
std::vector<unsigned char> pixels(numBytesPerImage, 120);
unsigned char* line = &pixels[0];
unsigned char *bit = image->bits(); //this comes from QImage
if (tw == 0) // no tiles read scanlines
{
qDebug() << "Found scanline rendering.\n";
for (int i = 0; i < h; i++)
{
bool success = in->read_scanlines(0, 0, i, i+1,
0, 0, 3,
TypeDesc::UCHAR, line);
if (!success)
qDebug() << "read scanline problem at scanline " << i
<< "\n";
line += numBytesPerLine;
}
memcpy(bit, &pixels[0], numBytesPerImage);
}
else {
qDebug() << "Found tiled rendering.\n";
int numTilePixels = tw * th;
int numBytesPerTile = numTilePixels * 3;
std::vector<unsigned char> tilePixels(numBytesPerTile,
80);
unsigned char* tilePtr = &tilePixels[0];
for (int x = 0; x < w; x += tw)
{
for (int y = 0; y < h; y += th)
{
int ttw = tw;
int tth = th;
if ((x + tw) >= w)
ttw = w - x;
if ((y + th) >= h)
tth = h - y;
bool success = in->read_tiles(0, 0, x,
x+ttw, y, y+tth, 0, 0, 0,
3, TypeDesc::UCHAR, tilePtr);
if (!success)
qDebug() << "read tiles
problem\n";
}
}
}
Thanks for any hints.
haggi
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