gen_image1_externgen_image1_externGenImage1Externgen_image1_externGenImage1ExternGenImage1Extern (Operator)

Name

gen_image1_externgen_image1_externGenImage1Externgen_image1_externGenImage1ExternGenImage1Extern — Create an image from a pointer on the pixels with storage management.

Signature

Description

The operator gen_image1_externgen_image1_externGenImage1Externgen_image1_externGenImage1ExternGenImage1Extern creates an image of the size WidthWidthWidthWidthWidthwidth * HeightHeightHeightHeightHeightheight. The pixels in PixelPointerPixelPointerPixelPointerPixelPointerPixelPointerpixelPointer are stored line-sequentially. The type of the given pixels (PixelPointerPixelPointerPixelPointerPixelPointerPixelPointerpixelPointer) must correspond to TypeTypeTypeTypeTypetype (see gen_image_constgen_image_constGenImageConstgen_image_constGenImageConstGenImageConst for a more detailed description of the image types). Note that how to pass a pointer value depends on the used operator signature and programming environment. Make sure to pass the actual memory address where the image data is stored, not the address of a pointer variable. Care must be taken not to truncate 64-bit pointers on 64-bit architectures.

The memory for the new image is not newly allocated by HALCON, contrary to gen_image1gen_image1GenImage1gen_image1GenImage1GenImage1, and thus is not copied either. This means that the memory space that PixelPointerPixelPointerPixelPointerPixelPointerPixelPointerpixelPointer points to must be released by deleting the object ImageImageImageImageImageimage. This is done by the procedure ClearProcClearProcClearProcClearProcClearProcclearProc provided by the caller. This procedure must have the following signature

void ClearProc(void* ptr);

and will be called using __cdecl calling convention when deleting ImageImageImageImageImageimage. If the memory shall not be released (in the case of frame grabbers or static memory) a procedure “without trunk” or the NULL-Pointer can be passed. Analogous to the parameter PixelPointerPixelPointerPixelPointerPixelPointerPixelPointerpixelPointer the pointer has to be passed to the procedure depending on the used operator signature and programming environment.

Attention

gen_image1_externgen_image1_externGenImage1Externgen_image1_externGenImage1ExternGenImage1Extern does not check if enough memory for an image of WidthWidthWidthWidthWidthwidth * HeightHeightHeightHeightHeightheight is allocated in PixelPointerPixelPointerPixelPointerPixelPointerPixelPointerpixelPointer.

Parallelization

• Multithreading type: reentrant (runs in parallel with non-exclusive operators).
• Multithreading scope: global (may be called from any thread).
• Processed without parallelization.

Parameters

Example (C)

void NewImage(Hobject *new)
{
  unsigned char  *image;
  int            r,c;
  image = malloc(640*480);
  for (r=0; r<480; r++)
    for (c=0; c<640; c++)
      image[r*640+c] = c % 255;
  gen_image1_extern(new,"byte",640,480,(Hlong)image,(Hlong)free);
}

Result

The operator gen_image1_externgen_image1_externGenImage1Externgen_image1_externGenImage1ExternGenImage1Extern returns the value 2 (H_MSG_TRUE) if the parameter values are correct. Otherwise an exception is raised.

Alternatives

gen_image1gen_image1GenImage1gen_image1GenImage1GenImage1, gen_image_constgen_image_constGenImageConstgen_image_constGenImageConstGenImageConst, get_image_pointer1get_image_pointer1GetImagePointer1get_image_pointer1GetImagePointer1GetImagePointer1, gen_image3_externgen_image3_externGenImage3Externgen_image3_externGenImage3ExternGenImage3Extern

See also

reduce_domainreduce_domainReduceDomainreduce_domainReduceDomainReduceDomain, paint_graypaint_grayPaintGraypaint_grayPaintGrayPaintGray, paint_regionpaint_regionPaintRegionpaint_regionPaintRegionPaintRegion, set_grayvalset_grayvalSetGrayvalset_grayvalSetGrayvalSetGrayval

Module

Foundation