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display jpeg's

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andi_m

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  • "andi_m" started this thread

Posts: 1

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1

Tuesday, May 31st 2005, 11:59pm

display jpeg's

I have a unsigned char buffer that holds a jpeg image
and I don't know how to convert it.
I tried it with a bmp like this: (it almost works), but how can I
handle a jpeg!?

QImage img(320, 240, 32, 0);

unsigned idx = 0;
for (unsigned i = 0; i < 240; ++i) {
QRgb *line = (QRgb*)img.scanLine(i);

for (unsigned j = 0; j < 320; ++j) {
line[j] = qRgb(buffer[idx], buffer[idx + 1], buffer[idx + 2]);
idx += 3; // for RGBA += 4
}
}

bitBlt(this,0,0,&img);

Krasu

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  • "Krasu" is male

Posts: 234

Location: Republic of Belarus

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2

Wednesday, June 1st 2005, 4:45am

RE: display jpeg's

Quoted


bool QImage::loadFromData ( const uchar * buf, uint len, const char * format = 0 )

Loads an image from the first len bytes of binary data in buf. Returns TRUE if the image was successfully loaded; otherwise returns FALSE.

If format is specified, the loader attempts to read the image using the specified format. If format is not specified (which is the default), the loader reads a few bytes from the header to guess the file format.

The QImageIO documentation lists the supported image formats and explains how to add extra formats.

This post has been edited 1 times, last edit by "Krasu" (Jun 1st 2005, 4:47am)