Ogre::PixelUtil Class Reference
Core » Image

Some utility functions for packing and unpacking pixel data. More...

`#include <OgrePixelFormat.h>`

## Static Public Member Functions

static void | bulkPixelConversion (void *src, PixelFormat srcFormat, void *dst, PixelFormat dstFormat, unsigned int count)
| Convert consecutive pixels from one format to another. More...
static void | bulkPixelConversion (const PixelBox &src, const PixelBox &dst)
| Convert pixels from one format to another. More...
static void | bulkPixelVerticalFlip (const PixelBox &box)
| Flips pixels inplace in vertical direction. More...
static void | getBitDepths (PixelFormat format, int rgba[4])
| Gives the number of bits (RGBA) for a format. More...
static void | getBitMasks (PixelFormat format, uint64 rgba[4])
| Gives the masks for the R, G, B and A component. More...
static void | getBitShifts (PixelFormat format, unsigned char rgba[4])
| Gives the bit shifts for R, G, B and A component. More...
static String | getBNFExpressionOfPixelFormats (bool accessibleOnly=false)
| Gets the BNF expression of the pixel-formats. More...
static size_t | getComponentCount (PixelFormat fmt)
| Returns the component count for a certain pixel format. More...
static PixelComponentType | getComponentType (PixelFormat fmt)
| Returns the component type for a certain pixel format. More...
static unsigned int | getFlags (PixelFormat format)
| Returns the property flags for this pixel format. More...
static PixelFormat | getFormatForBitDepths (PixelFormat fmt, ushort integerBits, ushort floatBits)
| Returns the similar format but acoording with given bit depths. More...
static PixelFormat | getFormatFromName (const String &name, bool accessibleOnly=false, bool caseSensitive=false)
| Gets the format from given name. More...
static String | getFormatName (PixelFormat srcformat)
| Gets the name of an image format. More...
static size_t | getMemorySize (uint32 width, uint32 height, uint32 depth, PixelFormat format)
| Returns the size in memory of a region with the given extents and pixel format with consecutive memory layout. More...
static size_t | getNumElemBits (PixelFormat format)
| Returns the size in bits of an element of the given pixel format. More...
static size_t | getNumElemBytes (PixelFormat format)
| Returns the size in bytes of an element of the given pixel format. More...
static bool | hasAlpha (PixelFormat format)
| Shortcut method to determine if the format has an alpha component. More...
static bool | isAccessible (PixelFormat srcformat)
| Returns whether the format can be packed or unpacked with the packColour() and unpackColour() functions. More...
static bool | isCompressed (PixelFormat format)
| Shortcut method to determine if the format is compressed. More...
static bool | isDepth (PixelFormat format)
| Shortcut method to determine if the format is a depth format. More...
static bool | isFloatingPoint (PixelFormat format)
| Shortcut method to determine if the format is floating point. More...
static bool | isInteger (PixelFormat format)
| Shortcut method to determine if the format is integer. More...
static bool | isLuminance (PixelFormat format)
| Shortcut method to determine if the format is a luminance format. More...
static bool | isNativeEndian (PixelFormat format)
| Shortcut method to determine if the format is in native endian format. More...
static bool | isValidExtent (size_t width, size_t height, size_t depth, PixelFormat format)
| Return whether a certain image extent is valid for this image format. More...
static void | packColour (const ColourValue &colour, const PixelFormat pf, void *dest)
| Pack a colour value to memory. More...
static void | packColour (const uint8 r, const uint8 g, const uint8 b, const uint8 a, const PixelFormat pf, void *dest)
| Pack a colour value to memory. More...
static void | packColour (const float r, const float g, const float b, const float a, const PixelFormat pf, void *dest)
| Pack a colour value to memory. More...
static void | unpackColour (ColourValue *colour, PixelFormat pf, const void *src)
| Unpack a colour value from memory. More...
static void | unpackColour (uint8 *r, uint8 *g, uint8 *b, uint8 *a, PixelFormat pf, const void *src)
| Unpack a colour value from memory. More...
static void | unpackColour (float *r, float *g, float *b, float *a, PixelFormat pf, const void *src)
| Unpack a colour value from memory. More...

## Detailed Description

Some utility functions for packing and unpacking pixel data.

Definition at line 417 of file OgrePixelFormat.h.

## Member Function Documentation

## bulkPixelConversion() [1/2]

static void Ogre::PixelUtil::bulkPixelConversion | ( | void * | src,
|  | PixelFormat | srcFormat,
|  | void * | dst,
|  | PixelFormat | dstFormat,
|  | unsigned int | count
| ) |  |

static

Convert consecutive pixels from one format to another.

No dithering or filtering is being done. Converting from RGB to luminance takes the R channel. In case the source and destination format match, just a copy is done.

Parameters

  src | Pointer to source region
  srcFormat | Pixel format of source region
  dst | Pointer to destination region
  dstFormat | Pixel format of destination region

## bulkPixelConversion() [2/2]

static void Ogre::PixelUtil::bulkPixelConversion | ( | const PixelBox & | src,
|  | const PixelBox & | dst
| ) |  |

static

Convert pixels from one format to another.

No dithering or filtering is being done. Converting from RGB to luminance takes the R channel.

Parameters

  src | PixelBox containing the source pixels, pitches and format
  dst | PixelBox containing the destination pixels, pitches and format

Remarks
  The source and destination boxes must have the same dimensions. In case the source and destination format match, a plain copy is done.

## bulkPixelVerticalFlip()

static void Ogre::PixelUtil::bulkPixelVerticalFlip | ( | const PixelBox & | box | ) |

static

Flips pixels inplace in vertical direction.

Parameters

  box | PixelBox containing pixels, pitches and format

Remarks
  Non consecutive pixel boxes are supported.

## getBitDepths()

static void Ogre::PixelUtil::getBitDepths | ( | PixelFormat | format,
|  | int | rgba[4]
| ) |  |

static

Gives the number of bits (RGBA) for a format.

See remarks.

Remarks
  For non-colour formats (dxt, depth) this returns [0,0,0,0].

## getBitMasks()

static void Ogre::PixelUtil::getBitMasks | ( | PixelFormat | format,
|  | uint64 | rgba[4]
| ) |  |

static

Gives the masks for the R, G, B and A component.

Note
  Only valid for native endian formats

## getBitShifts()

static void Ogre::PixelUtil::getBitShifts | ( | PixelFormat | format,
|  | unsigned char | rgba[4]
| ) |  |

static

Gives the bit shifts for R, G, B and A component.

Note
  Only valid for native endian formats

## getBNFExpressionOfPixelFormats()

static String Ogre::PixelUtil::getBNFExpressionOfPixelFormats | ( | bool | accessibleOnly = `false` | ) |

static

Gets the BNF expression of the pixel-formats.

Note
  The string returned by this function is intended to be used as a BNF expression to work with Compiler2Pass.

Parameters

  accessibleOnly | If true, only accessible pixel format will take into account, otherwise all pixel formats list in PixelFormat enumeration will being returned.

Returns
  A string contains the BNF expression.

## getComponentCount()

static size_t Ogre::PixelUtil::getComponentCount | ( | PixelFormat | fmt | ) |

static

Returns the component count for a certain pixel format.

Returns 3(no alpha) or 4 (has alpha) in case there is no clear component type like with compressed formats.

## getComponentType()

static PixelComponentType Ogre::PixelUtil::getComponentType | ( | PixelFormat | fmt | ) |

static

Returns the component type for a certain pixel format.

Returns PCT_BYTE in case there is no clear component type like with compressed formats. This is one of PCT_BYTE, PCT_SHORT, PCT_FLOAT16, PCT_FLOAT32.

## getFlags()

static unsigned int Ogre::PixelUtil::getFlags | ( | PixelFormat | format | ) |

static

Returns the property flags for this pixel format.

Returns
  A bitfield combination of PFF_HASALPHA, PFF_ISCOMPRESSED, PFF_FLOAT, PFF_DEPTH, PFF_NATIVEENDIAN, PFF_LUMINANCE

Remarks
  This replaces the separate functions for formatHasAlpha, formatIsFloat, ...

## getFormatForBitDepths()

static PixelFormat Ogre::PixelUtil::getFormatForBitDepths | ( | PixelFormat | fmt,
|  | ushort | integerBits,
|  | ushort | floatBits
| ) |  |

static

Returns the similar format but acoording with given bit depths.

Parameters

  fmt | The original foamt.
  integerBits | Preferred bit depth (pixel bits) for integer pixel format. Available values: 0, 16 and 32, where 0 (the default) means as it is.
  floatBits | Preferred bit depth (channel bits) for float pixel format. Available values: 0, 16 and 32, where 0 (the default) means as it is.

Returns
  The format that similar original format with bit depth according with preferred bit depth, or original format if no conversion occurring.

## getFormatFromName()

static PixelFormat Ogre::PixelUtil::getFormatFromName | ( | const String & | name,
|  | bool | accessibleOnly = `false`,
|  | bool | caseSensitive = `false`
| ) |  |

static

Gets the format from given name.

Parameters

  name | The string of format name
  accessibleOnly | If true, non-accessible format will treat as invalid format, otherwise, all supported format are valid.
  caseSensitive | Should be set true if string match should use case sensitivity.

Returns
  The format match the format name, or PF_UNKNOWN if is invalid name.

## getFormatName()

static String Ogre::PixelUtil::getFormatName | ( | PixelFormat | srcformat | ) |

static

Gets the name of an image format.

## getMemorySize()

static size_t Ogre::PixelUtil::getMemorySize | ( | uint32 | width,
|  | uint32 | height,
|  | uint32 | depth,
|  | PixelFormat | format
| ) |  |

static

Returns the size in memory of a region with the given extents and pixel format with consecutive memory layout.

Parameters

  width | The width of the area
  height | The height of the area
  depth | The depth of the area
  format | The format of the area

Returns
  The size in bytes

Remarks
  In case that the format is non-compressed, this simply returns width*height*depth*PixelUtil::getNumElemBytes(format). In the compressed case, this does serious magic.

## getNumElemBits()

static size_t Ogre::PixelUtil::getNumElemBits | ( | PixelFormat | format | ) |

static

Returns the size in bits of an element of the given pixel format.

Returns
  The size in bits of an element. See Remarks.

Remarks
  Passing PF_UNKNOWN will result in returning a size of 0 bits.

## getNumElemBytes()

static size_t Ogre::PixelUtil::getNumElemBytes | ( | PixelFormat | format | ) |

static

Returns the size in bytes of an element of the given pixel format.

Returns
  The size in bytes of an element. See Remarks.

Remarks
  Passing PF_UNKNOWN will result in returning a size of 0 bytes.

Referenced by Ogre::LinearResampler::scale(), and Ogre::LinearResampler_Float32::scale().

## hasAlpha()

static bool Ogre::PixelUtil::hasAlpha | ( | PixelFormat | format | ) |

static

Shortcut method to determine if the format has an alpha component.

## isAccessible()

static bool Ogre::PixelUtil::isAccessible | ( | PixelFormat | srcformat | ) |

static

Returns whether the format can be packed or unpacked with the packColour() and unpackColour() functions.

This is generally not true for compressed and depth formats as they are special. It can only be true for formats with a fixed element size.

Returns
  true if yes, otherwise false

## isCompressed()

static bool Ogre::PixelUtil::isCompressed | ( | PixelFormat | format | ) |

static

Shortcut method to determine if the format is compressed.

## isDepth()

static bool Ogre::PixelUtil::isDepth | ( | PixelFormat | format | ) |

static

Shortcut method to determine if the format is a depth format.

## isFloatingPoint()

static bool Ogre::PixelUtil::isFloatingPoint | ( | PixelFormat | format | ) |

static

Shortcut method to determine if the format is floating point.

## isInteger()

static bool Ogre::PixelUtil::isInteger | ( | PixelFormat | format | ) |

static

Shortcut method to determine if the format is integer.

## isLuminance()

static bool Ogre::PixelUtil::isLuminance | ( | PixelFormat | format | ) |

static

Shortcut method to determine if the format is a luminance format.

## isNativeEndian()

static bool Ogre::PixelUtil::isNativeEndian | ( | PixelFormat | format | ) |

static

Shortcut method to determine if the format is in native endian format.

## isValidExtent()

static bool Ogre::PixelUtil::isValidExtent | ( | size_t | width,
|  | size_t | height,
|  | size_t | depth,
|  | PixelFormat | format
| ) |  |

static

Return whether a certain image extent is valid for this image format.

Parameters

  width | The width of the area
  height | The height of the area
  depth | The depth of the area
  format | The format of the area

Remarks
  For non-compressed formats, this is always true. For DXT formats, only sizes with a width and height multiple of 4 and depth 1 are allowed.

## packColour() [1/3]

static void Ogre::PixelUtil::packColour | ( | const ColourValue & | colour,
|  | const PixelFormat | pf,
|  | void * | dest
| ) |  |

static

Pack a colour value to memory.

Parameters

  colour | The colour
  pf | Pixelformat in which to write the colour
  dest | Destination memory location

Referenced by Ogre::LinearResampler::scale().

## packColour() [2/3]

static void Ogre::PixelUtil::packColour | ( | const uint8 | r,
|  | const uint8 | g,
|  | const uint8 | b,
|  | const uint8 | a,
|  | const PixelFormat | pf,
|  | void * | dest
| ) |  |

static

Pack a colour value to memory.

Parameters

  r,g,b,a | The four colour components, range 0.0f to 1.0f (an exception to this case exists for floating point pixel formats, which don't clamp to 0.0f..1.0f)
  pf | Pixelformat in which to write the colour
  dest | Destination memory location

## packColour() [3/3]

static void Ogre::PixelUtil::packColour | ( | const float | r,
|  | const float | g,
|  | const float | b,
|  | const float | a,
|  | const PixelFormat | pf,
|  | void * | dest
| ) |  |

static

Pack a colour value to memory.

Parameters

  r,g,b,a | The four colour components, range 0.0f to 1.0f (an exception to this case exists for floating point pixel formats, which don't clamp to 0.0f..1.0f)
  pf | Pixelformat in which to write the colour
  dest | Destination memory location

## unpackColour() [1/3]

static void Ogre::PixelUtil::unpackColour | ( | ColourValue * | colour,
|  | PixelFormat | pf,
|  | const void * | src
| ) |  |

static

Unpack a colour value from memory.

Parameters

  colour | The colour is returned here
  pf | Pixelformat in which to read the colour
  src | Source memory location

## unpackColour() [2/3]

static void Ogre::PixelUtil::unpackColour | ( | uint8 * | r,
|  | uint8 * | g,
|  | uint8 * | b,
|  | uint8 * | a,
|  | PixelFormat | pf,
|  | const void * | src
| ) |  |

static

Unpack a colour value from memory.

Parameters

  r | The red channel is returned here (as byte)
  g | The blue channel is returned here (as byte)
  b | The green channel is returned here (as byte)
  a | The alpha channel is returned here (as byte)
  pf | Pixelformat in which to read the colour
  src | Source memory location

Remarks
  This function returns the colour components in 8 bit precision, this will lose precision when coming from PF_A2R10G10B10 or floating point formats.

## unpackColour() [3/3]

static void Ogre::PixelUtil::unpackColour | ( | float * | r,
|  | float * | g,
|  | float * | b,
|  | float * | a,
|  | PixelFormat | pf,
|  | const void * | src
| ) |  |

static

Unpack a colour value from memory.

Parameters

  r | The red channel is returned here (as float)
  g | The blue channel is returned here (as float)
  b | The green channel is returned here (as float)
  a | The alpha channel is returned here (as float)
  pf | Pixelformat in which to read the colour
  src | Source memory location

The documentation for this class was generated from the following file:

- OgrePixelFormat.h

Copyright © 2012 Torus Knot Software Ltd
This work is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.