IG_load_tiles_stitch

IG_load_tiles_stitch_mem

In This Topic

This function loads and stitches together a tiled image that has already been loaded into memory, returning you a HIGEAR handle to the image.

Declaration:

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AT_ERRCOUNT ACCUAPI IG_load_tiles_stitch_mem( LPVOID lpImage, AT_UINT nSize, UINT nPage, LPAT_STITCH lpStitch, LPHIGEAR lphIGear );

Arguments:

Name	Type	Description
lpImage	LPVOID	Pointer to a memory buffer containing the image.
nSize	AT_UINT	Size of image in memory.
nPage	UINT	Page number to load if this is a multi-page file. Note that page numbers begin at 1, not 0. Set nPage to 1 if this is not a multi-page file.
lpStitch	LPAT_STITCH	Set to a structure of type AT_STITCH, which defines the reference tile number, and the number of rows and columns of tiles.
lphIGear	LPHIGEAR	Returns a HIGEAR handle to the newly stitched-together image.

Return Value:

Returns 0 if successful. Otherwise, returns the number of ImageGear errors that occurred during this function call.

Supported Raster Image Formats:

All pixel formats supported by ImageGear for C and C++.

Sample:

None

Example:

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AT_ERRCOUNT nErrcount; HIGEAR hIGear; char far * lpWhereFile; AT_UINT nWholeSize; AT_STITCH stitchStruct = {1, 1, 1}; // Open a file and get its size FILE* fd; fopen_s(&fd, "picture.tif", "rb"); if(fd != NULL) { fseek(fd, 0, SEEK_END); nWholeSize = (AT_UINT)ftell(fd); fseek(fd, 0, SEEK_SET); // Allocate memory and read the image into the memory buffer lpWhereFile = (char*)malloc(nWholeSize); fread(lpWhereFile, 1, nWholeSize, fd); // File is no longer needed - close it fclose(fd); } if(lpWhereFile != NULL) { nErrcount = IG_load_tiles_stitch_mem(lpWhereFile, nWholeSize, 1, &stitchStruct, &hIGear); // delete memory free(lpWhereFile); } //... // Destroy the image if(IG_image_is_valid(hIGear)) { IG_image_delete(hIGear); }

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AT_ERRCOUNT  nErrcount;
HIGEAR hIGear;
char far * lpWhereFile;
AT_UINT         nWholeSize;
AT_STITCH stitchStruct = {1, 1, 1};
// Open a file and get its size
FILE* fd;
fopen_s(&fd, "picture.tif", "rb");
if(fd != NULL)
{
    fseek(fd, 0, SEEK_END);
    nWholeSize = (AT_UINT)ftell(fd);
    fseek(fd, 0, SEEK_SET);
    // Allocate memory and read the image into the memory buffer
    lpWhereFile = (char*)malloc(nWholeSize);
    fread(lpWhereFile, 1, nWholeSize, fd);
    // File is no longer needed - close it
    fclose(fd);
}

if(lpWhereFile != NULL)
{
    nErrcount = IG_load_tiles_stitch_mem(lpWhereFile, nWholeSize, 1, &stitchStruct, &hIGear);
    // delete memory 
    free(lpWhereFile);
}

//...

// Destroy the image
if(IG_image_is_valid(hIGear))
{
    IG_image_delete(hIGear);
}

Remarks:

The AT_STITCH structure allows you to tell ImageGear which tile to use as the upper-left corner in the new stitched image, and how many tile rows and columns should be stitched together. For a graphical representation of how this works, see Working with Tiled Images.

Simply loading and stitching the file does not cause it to be displayed. Refer to IG_dspl_image_draw and related routines, for how to display an image once it is in memory. See also IG_load_file_display function.

The nPage argument is set to 1 or greater if you are loading from a multi-page file, to indicate which page (image) you want to load. Set nPage to 1 for a non multi-page file.

If you set nPage to < 1, ImageGear will default the value to 1; if you set nPage to greater than the number of pages in the document, ImageGear will default the value to the last page number.

For a complete discussion of working with tiled images, see Working with Tiled Images.

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