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QNX Software Development Platform
QNX SDP is a cross-compiling and debugging environment, including an IDE and command-line tools, for building binary images and programs for target boards running QNX Neutrino 7.1.
Audio & Graphics API
Image Library Reference
Image API
IMG_FMT_BPP()
Determine the number of bits per pixel for the specified format

QNX Momentics IDE User's Guide
This User's Guide describes version 7.1 of the Integrated Development Environment (IDE) that's part of the QNX Momentics tool suite.
QNX Software Development Platform
QNX SDP is a cross-compiling and debugging environment, including an IDE and command-line tools, for building binary images and programs for target boards running QNX Neutrino 7.1.
- Quickstart Guide
- OS Components & Operations
- Audio & Graphics API
  - Audio Developer's Guide
    The Audio Developer's Guide is intended for developers who want to write audio applications using the QNX Sound Architecture (QSA) drivers and library.
  - Gestures Library Reference
    The Gestures library provides gesture recognizers to detect gestures through touch events that occur when you place one or more fingers on a touch screen.
  - Image Library Reference
    - Working with Images
    - Image API
      - img_cfg_read()
        Read a configuration file and load codecs
      - img_codec_get_criteria()
        Get the extension and mime information for a given codec
      - img_codec_list()
        Enumerate codecs
      - img_codec_list_byext()
        Enumerate codecs by file extension
      - img_codec_list_bymime()
        Enumerate codecs by MIME type
      - img_convert_data()
        Convert data from one image format to another
      - img_convert_getfunc()
        Get a function to convert one image format to another
      - img_crop()
        Crop an image
      - img_decode_begin()
        Prepare to decode one or more frames from a stream
      - img_decode_callouts_t
        Decoder callout table
      - img_decode_finish()
        Release decode resources
      - img_decode_frame()
        Decode a frame
      - img_decode_validate()
        Find a codec for decoding
      - img_dtransform()
        Convert an image from one format to another
      - img_dtransform_apply()
        Apply a data transform
      - img_dtransform_create()
        Prepare to transform an image
      - img_dtransform_free()
        Free a transform structure
      - img_encode_begin()
        Prepare to encode one or more frames to a stream
      - img_encode_callouts_t
        Encoder callout table
      - img_encode_finish()
        Release encode resources
      - img_encode_frame()
        Encode a frame
      - img_expand_getfunc()
        Get a function to convert a palette format to a direct format
      - IMG_FMT_BPL()
        Calculate the minimum number of bytes required to represent a pixel run
      - IMG_FMT_BPP()
        Determine the number of bits per pixel for the specified format
      - img_format_t
        Image formats
      - img_lib_attach()
        Initialize the image library
      - img_lib_detach()
        Detach from the library
      - img_load()
        Decode a frame from a stream
      - img_load_file()
        Decode a frame from a file on the filesystem
      - img_load_resize()
        Decode and resize a frame from a stream
      - img_load_resize_file()
        Decode and resize a frame from a file on the filesystem
      - img_resize_fs()
        Resize an image
      - img_rotate_ortho()
        Rotate an image by 90-degree increments
      - img_write()
        Encode a frame to an output stream on the filesystem
      - img_write_file()
        Encode a frame to a file on the filesystem
      - img_t
        Information describing an image
      - io_close()
        Release an input stream
      - io_open()
        Initialize an IO stream
  - Input Events Library Reference
    The Input Events library provides the framework necessary for Screen Graphics Subsystem to communicate with your touch driver.
  - OpenWF Configuration Developer's Guide
    If you are integrating a new display, you must configure and provide the parameters of your display based on its specifications via the OpenWF Display Configuration API (Wfdcfg Library).
  - Screen Graphics Subsystem Developer's Guide
    QNX Screen Graphics Subsystem is a graphics framework that provides all the functionality necessary to develop interactive user experiences.
  - Video Capture Developer's Guide
    The video capture framework provides applications the ability to capture frames from a video input source. These frames can be passed to a graphics component such as Screen for display.
- Multimedia
- Networking Middleware
- Programming
- Sensor Framework
- System Security Guide
  The QNX System Security Guide is intended for both system integrators who are responsible for the security of a QNX Neutrino RTOS system and developers who want to create a QNX Neutrino resource manager free from vulnerabilities.
- Utilities & Libraries
QNX Hypervisor
The QNX Hypervisor allows you to run multiple OSs on a target system so you can separate critical and non-critical functions, support a wide variety of applications, and reduce hardware costs.
QNX Software in the Cloud
QNX Software in the Cloud enables developers to use the QNX software in Amazon Web Services (AWS) and Microsoft Azure (Azure).
QNX Advanced Virtualization Frameworks User's Guide
This User's Guide is aimed at all systems integrators and developers who want to design and build embedded systems using the QNX Advanced Virtualization Frameworks.
Typographical Conventions, Support, and Licensing
This section describes the typographical conventions used throughout the documentation and explains how to obtain technical support.

IMG_FMT_BPP()

Determine the number of bits per pixel for the specified format

Synopsis:

#include <img/img.h>

#define IMG_FMT_BPP(_fmt) ...

Arguments:

_fmt: An img_format_t specifying the data format of the frame.

Library:

libimg

Use the -l img option to qcc to link against this library.

Description:

This macro determines the number of bits per pixel for the specified data format.

Returns:

The number of bits required to represent a single pixel.

Classification:

Image library


Safety:
Interrupt handler	No
Signal handler	No
Thread	No

Page updated: March 12, 2026