Graphics Importers

QPix accomplishes most of its functionality with the help of QuickTime's graphics import components, aka "graphics importers".

When dealing with image files and plug-in areas QPix uses graphics importers internally and masks out all potentially confusing details. However, in order to provide the most of QuickTime's capabilities and flexibility, QPix also includes a set of commands for directly working with graphics importers.

Graphics importers are code modules. Each importer "knows" all the details of a specific graphic file format and provides specific services to the client software. Graphics importers have the following properties:

Type (String4) (In pure IM terms, this is the component subtype field)

Flags (Longint)

Name (String255)

The files supported by a graphics importer are specified by the importer's type in conjunction with bit #12 of the flags property. If bit #12 is off, the importer's type is the Mac file type of the supported files. If bit #12 is on, it is a filename extension.

Examples

Type: '8BPS'

Flags: 0x40000000

Name: Photoshop

This is the Photoshop importer. It supports files of type '8BPS' (0x40000000 bit #12 is false).

Type: 'GIF '

Flags: 0x40001200

Name: GIF

This importer knows how to handle GIF files. It supports files with the .GIF filename extension (0x40001200 bit #12 is true).

Note

QPx_NewImporterForFile Creates a graphics importer instance for the image stored in a file
QPx_NewImporterForData Creates a graphics importer instance for the image data stored in a BLOB
QPx_NewImporterForURL Creates a graphics importer from a URL
QPx_NewImporterForPict Creates a graphics importer instance for the image data stored in a BLOB
QPx_NewImporter Creates a graphics importer instance
QPx_FreeImporter Destroys an existing importer instance
QPx_SetImporterFile Assigns an image file to a graphics importer
QPx_GetImporterFile Returns the pathname of the file associated with a graphics importer
QPx_SetImporterData Assigns the image data contained in a BLOB to a graphics importer
QPx_GetImporterData Returns the image data associated with a graphics importer
QPx_SetImporterOffsetAndLimit Specifies start and end of data within a container
QPx_GetImporterOffsetAndLimit Returns start and end of data within a container
QPx_ValidateImporter Asks a graphic importer to test image data
QPx_GetImporterImageSize Returns the dimensions of the image associated with a graphics importer
QPx_GetImporterImageRes Returns the resolutions of the image associated with a graphics importer
QPx_GetImporterImageDepth Returns the pixel depth of the image associated with a graphics importer
QPx_GetImporterInfo Returns information about a graphics importer
QPx_GetImporterColorSpace Returns the color space of the image associated with a graphics importer
QPx_GetImporterColorProfile Returns the color profile of the image associated with a graphics importer
QPx_GetImporterEmbeddedThumb Reads the embedded thumbnail from an image
QPx_CreateImporterThumbnail Creates a high quality thumbnail from image data associated with a graphic importer
QPx_ReadImporterImageInPict Reads the image associated with a graphics importer
QPx_ExportImporterImage Exports a graphic importer
QPx_ExportImporterImageToBLOB Exports a graphic importer into a BLOB
QPx_GetImporterTagContainer Extracts the tag container from the image associated with a graphics importer
QPx_CountImporterFrames Returns the number of images in a multi-image container
QPx_SetImporterFrameIndex Changes the current frame in a multi-image container
QPx_GetImporterFrameIndex Returns the current frame of a multi-image container
QPx_GetImporterFrameType Returns the type of a frame in a multi-frame image.

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