OP_ZOOM2: DIB zoom/shrink, gray scale, halftone

The OP_ZOOM2 opcode operates on input DIB's creating output DIB's of various width, height, bit-depth and pixel type.

Augural zooming technology provides enhanced edge sharpness.

Allowable input/output pixel types are:

• Grayscale from 1 to 16 bits, packed to 1, 8, or 16 bits per pixel in big-endian or little-endian format.
• Color-mapped from 1 to 8 bits, packed to 1, 4, or 8 bits per pixel.
• RGB at 15 (packed to 16 bits per pixel), 16, or 24 bits.
• RGB/Alpha at 32 bits per pixel.
• YUYV at 16 bits per pixel.

Optional conversion of the image to grayscale is available for all input/output combinations. Conversion to grayscale is mandatory for certain input/output bit-depth/pixel-type combinations.

Optional fast zoom mode uses resampling to provide faster execution, but with poorer image quality. Fast zoom mode is mandatory for certain input/output bit-depth/pixel-type combinations.

See the ZOOM2_PARMS structure section for additional information.

Notes

• Get and Put queues are not used during the REQ_INIT request.
• The Get queue can be allocated during the REQ_EXEC response loop if desired.
• The Put queue can be allocated during the REQ_EXEC response loop if desired. 
• Get and Put buffers must be large enough to hold one complete image row.
• RGB/Alpha output is possible only with RGB/Alpha input.
• The output image stride and offset may be set between the REQ_INIT request and the REQ_EXEC request.