Cirrus Logic CS485 Dokumentacja Pobierz pdf (Strona 105)

Image Creation and Access

4-51

• The dimensions of the converted IplImage should be greater than or

equal to that of the DIB image. When the converted image is larger

than the DIB image, the origins of

IplImage and the DIB image are

made coincident for the purposes of copying.

• When converting a DIB RGBA image, the destination

IplImage

should also contain an alpha channel.

Example 4-9 Converting a DIB Image Into an IplImage

int example48( void ) {

BITMAPINFO *dib; // pointer to bitmap

RGBQUAD *rgb; // pointer to bitmap colors

unsigned char *data; // pointer to bitmap data

BITMAPINFOHEADER *dibh; // header beginning

IplImage *img = NULL;

int i;

__try {

int size = HEIGHT * ((WIDTH+3) & ~3);

// allocate memory for bitmap

dib = malloc(sizeof(BITMAPINFOHEADER)

+ sizeof(RGBQUAD)*256 + size );

if( NULL == dib ) return 0;

// define corresponedt pointers

dibh = (BITMAPINFOHEADER*)dib;

rgb=(RGBQUAD*)((char*)dib + sizeof(BITMAPINFOHEADER));

data = (unsigned char*)((char*)rgb +

sizeof(RGBQUAD)*256);

// define bitmap

dibh->biSize = sizeof(BITMAPINFOHEADER);

dibh->biWidth = WIDTH;

dibh->biHeight = HEIGHT;

dibh->biPlanes = 1;

dibh->biBitCount = 8;

continued

☞

1 2 ... 100 101 102 103 104 105 106 107 108 109 110 ... 318 319

Brak uwag

Cirrus Logic CS485 Dokumentacja Strona 105