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IOGraphicsTypes.h

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Overview

Structs and Unions

IOColorEntry

A structure defining one entry of a color lookup table.

struct IOColorEntry { 
    UInt16 index; 
    IOColorComponent red; 
    IOColorComponent green; 
    IOColorComponent blue; 
};

Fields

index: Number of pixels visible per row.
red: Value of red component 0-65535.
green: Value of green component 0-65535.
blue: Value of blue component 0-65535.

Discussion

This structure is used by IOFramebuffer to define an entry of a color lookup table.

IODetailedTimingInformationV2

A structure defining the detailed timing information of a display mode.

struct IODetailedTimingInformationV2 {  
    UInt32 __reservedA[3]; // Init to 0 
    UInt32 horizontalScaledInset; // pixels 
    UInt32 verticalScaledInset; // lines  
    UInt32 scalerFlags; 
    UInt32 horizontalScaled; 
    UInt32 verticalScaled;  
    UInt32 signalConfig; 
    UInt32 signalLevels;  
    UInt64 pixelClock; // Hz  
    UInt64 minPixelClock; // Hz - With error what is slowest actual clock 
    UInt64 maxPixelClock; // Hz - With error what is fasted actual clock  
    UInt32 horizontalActive; // pixels 
    UInt32 horizontalBlanking; // pixels 
    UInt32 horizontalSyncOffset; // pixels 
    UInt32 horizontalSyncPulseWidth; // pixels  
    UInt32 verticalActive; // lines 
    UInt32 verticalBlanking; // lines 
    UInt32 verticalSyncOffset; // lines 
    UInt32 verticalSyncPulseWidth; // lines  
    UInt32 horizontalBorderLeft; // pixels 
    UInt32 horizontalBorderRight; // pixels 
    UInt32 verticalBorderTop; // lines 
    UInt32 verticalBorderBottom; // lines  
    UInt32 horizontalSyncConfig; 
    UInt32 horizontalSyncLevel; // Future use (init to 0) 
    UInt32 verticalSyncConfig; 
    UInt32 verticalSyncLevel; // Future use (init to 0) 
    UInt32 numLinks;  
    UInt32 __reservedB[7]; // Init to 0 
};

Fields

__reservedA: Set to zero.
horizontalScaledInset: If the mode is scaled, sets the number of active pixels to remove the left and right edges in order to display an underscanned image.
verticalScaledInset: If the mode is scaled, sets the number of active lines to remove the top and bottom edges in order to display an underscanned image.
scalerFlags: If the mode is scaled, kIOScaleStretchToFit may be set to allow stretching. kIOScaleRotateFlags is mask which may have the value given by kIOScaleRotate90, kIOScaleRotate180, kIOScaleRotate270 to display a rotated framebuffer.
horizontalScaled: If the mode is scaled, sets the size of the image before scaling or rotation.
verticalScaled: If the mode is scaled, sets the size of the image before scaling or rotation.
signalConfig: kIOAnalogSetupExpected set if display expects a blank-to-black setup or pedestal. See VESA signal standards.
kIOInterlacedCEATiming set for a CEA style interlaced timing:
Field 1 vertical blanking = half specified vertical blanking lines.
Field 2 vertical blanking = (half vertical blanking lines) + 1 line.
Field 1 vertical offset = half specified vertical sync offset.
Field 2 vertical offset = (half specified vertical sync offset) + 0.5 lines.
signalLevels: One of:
kIOAnalogSignalLevel_0700_0300 0.700 - 0.300 V p-p.
kIOAnalogSignalLevel_0714_0286 0.714 - 0.286 V p-p.
kIOAnalogSignalLevel_1000_0400 1.000 - 0.400 V p-p.
kIOAnalogSignalLevel_0700_0000 0.700 - 0.000 V p-p.
pixelClock: Pixel clock frequency in Hz.
minPixelClock: Minimum pixel clock frequency in Hz, with error.
maxPixelClock: Maximum pixel clock frequency in Hz, with error.
horizontalActive: Pixel clocks per line.
horizontalBlanking: Blanking clocks per line.
horizontalSyncOffset: First clock of horizontal sync.
horizontalSyncPulseWidth: Width of horizontal sync.
verticalActive: Number of lines per frame.
verticalBlanking: Blanking lines per frame.
verticalSyncOffset: First line of vertical sync.
verticalSyncPulseWidth: Height of vertical sync.
horizontalBorderLeft: Number of pixels in left horizontal border.
horizontalBorderRight: Number of pixels in right horizontal border.
verticalBorderTop: Number of lines in top vertical border.
verticalBorderBottom: Number of lines in bottom vertical border.
horizontalSyncConfig: kIOSyncPositivePolarity for positive polarity horizontal sync (0 for negative).
horizontalSyncLevel: Zero.
verticalSyncConfig: kIOSyncPositivePolarity for positive polarity vertical sync (0 for negative).
verticalSyncLevel: Zero.
numLinks: number of links to be used by a dual link timing, if zero, assume one link.
__reservedB: Reserved set to zero.

Discussion

This structure is used by IOFramebuffer to define detailed timing information for a display mode. The VESA EDID document has more information.

IODisplayModeInformation

A structure defining the format of a framebuffer.

struct IODisplayModeInformation { 
    UInt32 nominalWidth; 
    UInt32 nominalHeight; 
    IOFixed1616 refreshRate; 
    IOIndex maxDepthIndex; 
    UInt32 flags; 
    UInt32 reserved[ 4 ]; 
};

Fields

nominalWidth: Number of pixels visible per row.
nominalHeight: Number of visible pixel rows.
refreshRate: Refresh rate in fixed point 16.16.
maxDepthIndex: Highest depth index available in this display mode.
flags: Flags for the mode, including:
kDisplayModeInterlacedFlag mode is interlaced.
kDisplayModeSimulscanFlag mode is available on multiple display connections.
kDisplayModeNotPresetFlag mode is not a factory preset for the display (geometry may need correction).
kDisplayModeStretchedFlag mode is stretched/distorted to match the display aspect ratio.
reserved: Set to zero.

Discussion

This structure is used by IOFramebuffer to define the format of the pixels.

IODisplayScalerInformation

A structure defining the scaling capabilities of a framebuffer.

struct IODisplayScalerInformation { 
    UInt32 __reservedA[1]; // Init to 0 
    UInt32 version; // Init to 0 
    UInt32 __reservedB[2]; // Init to 0  
    IOOptionBits scalerFeatures; 
    UInt32 maxHorizontalPixels; 
    UInt32 maxVerticalPixels; 
    UInt32 __reservedC[5]; // Init to 0 
};

Fields

__reservedA: Set to zero.
version: Set to zero.
__reservedB: Set to zero.
scalerFeatures: Mask of scaling features. The following are defined:
kIOScaleStretchOnly If set the framebuffer can only provide stretched scaling with non-square pixels, without borders.
kIOScaleCanUpSamplePixels If set framebuffer can scale up from a smaller number of source pixels to a larger native timing (eg. 640x480 pixels on a 1600x1200 timing).
kIOScaleCanDownSamplePixels If set framebuffer can scale down from a larger number of source pixels to a smaller native timing (eg. 1600x1200 pixels on a 640x480 timing).
kIOScaleCanScaleInterlaced If set framebuffer can scale an interlaced detailed timing.
kIOScaleCanSupportInset If set framebuffer can support scaled modes with non-zero horizontalScaledInset, verticalScaledInset fields.
kIOScaleCanRotate If set framebuffer can support some of the flags in the kIOScaleRotateFlags mask.
maxHorizontalPixels: Maximum number of horizontal source pixels (horizontalScaled).
maxVerticalPixels: Maximum number of vertical source pixels (verticalScaled).
__reservedC: Set to zero.

Discussion

This structure is used to define the limits for modes programmed as detailed timings by the OS. A data property with this structure under the key kIOFBScalerInfoKey in a framebuffer will allow the OS to program detailed timings that are scaled to a displays native resolution.

IODisplayTimingRange

A structure defining the limits and attributes of a display or framebuffer.

struct IODisplayTimingRange { 
    UInt32 __reservedA[2]; // Init to 0 
    UInt32 version; // Init to 0 
    UInt32 __reservedB[5]; // Init to 0  
    UInt64 minPixelClock; // Min dot clock in Hz 
    UInt64 maxPixelClock; // Max dot clock in Hz  
    UInt32 maxPixelError; // Max dot clock error 
    UInt32 supportedSyncFlags; 
    UInt32 supportedSignalLevels; 
    UInt32 supportedSignalConfigs;  
    UInt32 minFrameRate; // Hz 
    UInt32 maxFrameRate; // Hz 
    UInt32 minLineRate; // Hz 
    UInt32 maxLineRate; // Hz  
    UInt32 maxHorizontalTotal; // Clocks - Maximum total (active + blanking) 
    UInt32 maxVerticalTotal; // Clocks - Maximum total (active + blanking) 
    UInt32 __reservedD[2]; // Init to 0  
    UInt8 charSizeHorizontalActive; 
    UInt8 charSizeHorizontalBlanking; 
    UInt8 charSizeHorizontalSyncOffset; 
    UInt8 charSizeHorizontalSyncPulse;  
    UInt8 charSizeVerticalActive; 
    UInt8 charSizeVerticalBlanking; 
    UInt8 charSizeVerticalSyncOffset; 
    UInt8 charSizeVerticalSyncPulse;  
    UInt8 charSizeHorizontalBorderLeft; 
    UInt8 charSizeHorizontalBorderRight; 
    UInt8 charSizeVerticalBorderTop; 
    UInt8 charSizeVerticalBorderBottom;  
    UInt8 charSizeHorizontalTotal; // Character size for active + blanking 
    UInt8 charSizeVerticalTotal; // Character size for active + blanking 
    UInt16 __reservedE; // Reserved (Init to 0)  
    UInt32 minHorizontalActiveClocks; 
    UInt32 maxHorizontalActiveClocks; 
    UInt32 minHorizontalBlankingClocks; 
    UInt32 maxHorizontalBlankingClocks;  
    UInt32 minHorizontalSyncOffsetClocks; 
    UInt32 maxHorizontalSyncOffsetClocks; 
    UInt32 minHorizontalPulseWidthClocks; 
    UInt32 maxHorizontalPulseWidthClocks;  
    UInt32 minVerticalActiveClocks; 
    UInt32 maxVerticalActiveClocks; 
    UInt32 minVerticalBlankingClocks; 
    UInt32 maxVerticalBlankingClocks;  
    UInt32 minVerticalSyncOffsetClocks; 
    UInt32 maxVerticalSyncOffsetClocks; 
    UInt32 minVerticalPulseWidthClocks; 
    UInt32 maxVerticalPulseWidthClocks;  
    UInt32 minHorizontalBorderLeft; 
    UInt32 maxHorizontalBorderLeft; 
    UInt32 minHorizontalBorderRight; 
    UInt32 maxHorizontalBorderRight;  
    UInt32 minVerticalBorderTop; 
    UInt32 maxVerticalBorderTop; 
    UInt32 minVerticalBorderBottom; 
    UInt32 maxVerticalBorderBottom; 
    UInt32 maxNumLinks; // number of links, if zero, assume link 1 
    UInt32 minLink0PixelClock; // min pixel clock for link 0 (kHz) 
    UInt32 maxLink0PixelClock; // max pixel clock for link 0 (kHz) 
    UInt32 minLink1PixelClock; // min pixel clock for link 1 (kHz) 
    UInt32 maxLink1PixelClock; // max pixel clock for link 1 (kHz)  
    UInt32 __reservedF[3]; // Init to 0 
};

Fields

__reservedA: Set to zero.
version: Set to zero.
__reservedB: Set to zero.
minPixelClock: minimum pixel clock frequency in range, in Hz.
minPixelClock: maximum pixel clock frequency in range, in Hz.
maxPixelError: largest variation between specified and actual pixel clock frequency, in Hz.
supportedSyncFlags: mask of supported sync attributes. The following are defined:
kIORangeSupportsSeparateSyncs - digital separate syncs.
kIORangeSupportsSyncOnGreen - sync on green.
kIORangeSupportsCompositeSync - composite sync.
kIORangeSupportsVSyncSerration - vertical sync has serration and equalization pulses.
supportedSignalLevels: mask of possible signal levels. The following are defined:
kIORangeSupportsSignal_0700_0300 0.700 - 0.300 V p-p.
kIORangeSupportsSignal_0714_0286 0.714 - 0.286 V p-p.
kIORangeSupportsSignal_1000_0400 1.000 - 0.400 V p-p.
kIORangeSupportsSignal_0700_0000 0.700 - 0.000 V p-p.
supportedSignalConfigs: mask of possible signal configurations. The following are defined:
kIORangeSupportsInterlacedCEATiming Supports CEA style interlaced timing:
Field 1 vertical blanking = specified vertical blanking lines.
Field 2 vertical blanking = vertical blanking lines + 1 line.
Field 1 vertical offset = specified vertical sync offset.
Field 2 vertical offset = specified vertical sync offset + 0.5 lines.
minFrameRate: minimum frame rate (vertical refresh frequency) in range, in Hz.
maxFrameRate: maximum frame rate (vertical refresh frequency) in range, in Hz.
minLineRate: minimum line rate (horizontal refresh frequency) in range, in Hz.
maxLineRate: maximum line rate (horizontal refresh frequency) in range, in Hz.
maxHorizontalTotal: maximum clocks in horizontal line (active + blanking).
maxVerticalTotal: maximum lines in vertical frame (active + blanking).
__reservedD: Set to zero.
charSizeHorizontalActive: horizontalActive must be a multiple of charSizeHorizontalActive.
charSizeHorizontalBlanking: horizontalBlanking must be a multiple of charSizeHorizontalBlanking.
charSizeHorizontalSyncOffset: horizontalSyncOffset must be a multiple of charSizeHorizontalSyncOffset.
charSizeHorizontalSyncPulse: horizontalSyncPulse must be a multiple of charSizeHorizontalSyncPulse.
charSizeVerticalActive: verticalActive must be a multiple of charSizeVerticalActive.
charSizeVerticalBlanking: verticalBlanking must be a multiple of charSizeVerticalBlanking.
charSizeVerticalSyncOffset: verticalSyncOffset must be a multiple of charSizeVerticalSyncOffset.
charSizeVerticalSyncPulse: verticalSyncPulse must be a multiple of charSizeVerticalSyncPulse.
charSizeHorizontalBorderLeft: horizontalBorderLeft must be a multiple of charSizeHorizontalBorderLeft.
charSizeHorizontalBorderRight: horizontalBorderRight must be a multiple of charSizeHorizontalBorderRight.
charSizeVerticalBorderTop: verticalBorderTop must be a multiple of charSizeVerticalBorderTop.
charSizeVerticalBorderBottom: verticalBorderBottom must be a multiple of charSizeVerticalBorderBottom.
charSizeHorizontalTotal: (horizontalActive + horizontalBlanking) must be a multiple of charSizeHorizontalTotal.
charSizeVerticalTotal: (verticalActive + verticalBlanking) must be a multiple of charSizeVerticalTotal.
__reservedE: Set to zero.
minHorizontalActiveClocks: minimum value of horizontalActive.
maxHorizontalActiveClocks: maximum value of horizontalActive.
minHorizontalBlankingClocks: minimum value of horizontalBlanking.
maxHorizontalBlankingClocks: maximum value of horizontalBlanking.
minHorizontalSyncOffsetClocks: minimum value of horizontalSyncOffset.
maxHorizontalSyncOffsetClocks: maximum value of horizontalSyncOffset.
minHorizontalPulseWidthClocks: minimum value of horizontalPulseWidth.
maxHorizontalPulseWidthClocks: maximum value of horizontalPulseWidth.
minVerticalActiveClocks: minimum value of verticalActive.
maxVerticalActiveClocks: maximum value of verticalActive.
minVerticalBlankingClocks: minimum value of verticalBlanking.
maxVerticalBlankingClocks: maximum value of verticalBlanking.
minVerticalSyncOffsetClocks: minimum value of verticalSyncOffset.
maxVerticalSyncOffsetClocks: maximum value of verticalSyncOffset.
minVerticalPulseWidthClocks: minimum value of verticalPulseWidth.
maxVerticalPulseWidthClocks: maximum value of verticalPulseWidth.
minHorizontalBorderLeft: minimum value of horizontalBorderLeft.
maxHorizontalBorderLeft: maximum value of horizontalBorderLeft.
minHorizontalBorderRight: minimum value of horizontalBorderRight.
maxHorizontalBorderRight: maximum value of horizontalBorderRight.
minVerticalBorderTop: minimum value of verticalBorderTop.
maxVerticalBorderTop: maximum value of verticalBorderTop.
minVerticalBorderBottom: minimum value of verticalBorderBottom.
maxVerticalBorderBottom: maximum value of verticalBorderBottom.
maxNumLinks: number of links supported, if zero, 1 link is assumed.
minLink0PixelClock: minimum pixel clock for link 0 (kHz).
maxLink0PixelClock: maximum pixel clock for link 0 (kHz).
minLink1PixelClock: minimum pixel clock for link 1 (kHz).
maxLink1PixelClock: maximum pixel clock for link 1 (kHz).
__reservedF: Set to zero.

Discussion

This structure is used to define the limits for modes programmed as detailed timings by the OS. The VESA EDID is useful background information for many of these fields. A data property with this structure under the key kIOFBTimingRangeKey in a framebuffer will allow the OS to program detailed timings that fall within its range.

IOHardwareCursorDescriptor

A structure defining the format of a hardware cursor.

struct IOHardwareCursorDescriptor { 
    UInt16 majorVersion; 
    UInt16 minorVersion; 
    UInt32 height; 
    UInt32 width; 
    UInt32 bitDepth; // bits per pixel, or a QD/QT pixel type 
    UInt32 maskBitDepth; // unused 
    UInt32 numColors; // number of colors in the colorMap. ie. 
    UInt32 *colorEncodings; 
    UInt32 flags; 
    UInt32 supportedSpecialEncodings; 
    UInt32 specialEncodings[16]; 
};

Fields

majorVersion: Set to kHardwareCursorDescriptorMajorVersion.
minorVersion: Set to kHardwareCursorDescriptorMinorVersion.
height: Maximum size of the cursor.
width: Maximum size of the cursor.
bitDepth: Number bits per pixel, or a QD/QT pixel type, for example kIO8IndexedPixelFormat, kIO32ARGBPixelFormat.
maskBitDepth: Unused.
numColors: Number of colors for indexed pixel types.
colorEncodings: An array pointer specifying the pixel values corresponding to the indices into the color table, for indexed pixel types.
flags: None defined, set to zero.
supportedSpecialEncodings: Mask of supported special pixel values, eg. kTransparentEncodedPixel, kInvertingEncodedPixel.
specialEncodings: Array of pixel values for each supported special encoding.

Discussion

This structure is used by IOFramebuffer to define the format of a hardware cursor.

IOPixelInformation

A structure defining the format of a framebuffer.

struct IOPixelInformation { 
    IOByteCount bytesPerRow; 
    IOByteCount bytesPerPlane; 
    UInt32 bitsPerPixel; 
    UInt32 pixelType; 
    UInt32 componentCount; 
    UInt32 bitsPerComponent; 
    UInt32 componentMasks[ 8 * 2 ]; 
    IOPixelEncoding pixelFormat; 
    UInt32 flags; 
    UInt32 activeWidth; 
    UInt32 activeHeight; 
    UInt32 reserved[ 2 ]; 
};

Fields

bytesPerRow: The number of bytes per row.
bytesPerPlane: Not used.
bitsPerPixel: The number of bits per pixel, including unused bits and alpha.
pixelType: One of kIOCLUTPixels (indexed pixels with changeable CLUT), kIORGBDirectPixels (direct pixels).
componentCount: One for indexed pixels, three for direct pixel formats.
bitsPerComponent: Number of bits per component in each pixel.
componentMasks: Mask of the bits valid for each component of the pixel - in R, G, B order for direct pixels.
pixelFormat: String description of the pixel format - IO32BitDirectPixels, IO16BitDirectPixels etc.
flags: None defined - set to zero.
activeWidth: Number of pixels visible per row.
activeHeight: Number of visible pixel rows.
reserved: Set to zero.

Discussion

This structure is used by IOFramebuffer to define the format of the pixels.

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Last Updated: 2008-12-19