/*
	File:		EI_MakeImageDescription.c
	
	Description: Code which constructs an image description structure for the Electric Image
				 importer sample code.

	Author:		QuickTime Engineering, JSAM

	Copyright: 	© Copyright 1999-2003 Apple Computer, Inc. All rights reserved.
	
	Disclaimer:	IMPORTANT:  This Apple software is supplied to you by Apple Computer, Inc.
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				are granted by Apple herein, including but not limited to any patent rights that
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				Software may be incorporated.

				The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO
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	Change History (most recent first):
	   <1>	 	11/28/99	QTE			first file
*/

#if __MACH__
    #include <Carbon/Carbon.h>
#else
    #include <Endian.h>
#endif

#include "EI_MakeImageDescription.h"

OSErr EI_MakeImageDescription(ImageFramePtr frame, long colorCount, UInt8 *color, ImageDescriptionHandle *descOut)
{
	OSErr err = noErr;
	ImageDescriptionHandle desc = NULL;
	ImageDescriptionPtr idp;
	CTabHandle colors =  NULL;

	desc = (ImageDescriptionHandle)NewHandleClear(sizeof(ImageDescription));
	if (err = MemError()) goto bail;

	idp = *desc;
	idp->idSize = sizeof(ImageDescription);					// total size of this image description structure with extra data including color lookup tables and other per sequence data
	idp->cType = FOUR_CHAR_CODE('EIDI');					// type of compressor component that created this compressed image data
	idp->vendor = kAppleManufacturer;						// identifies the developer of the compressor that created the compressed image
	idp->frameCount = 1;									// the number of frames in the image data associated with this description
	idp->depth = frame->frameBitDepth + frame->frameAlpha;	// pixel depth specified for the compressed image
	idp->clutID = -1;										// ID of the color table for the compressed image, -1 if the image does not use a color table 
	idp->hRes = 72L << 16;									// horizontal resolution dpi
	idp->vRes = 72L << 16;									// vertical resolution dpi
	idp->width = EndianU16_BtoN(frame->frameRect.right) - EndianU16_BtoN(frame->frameRect.left);	// image width in pixels
	idp->height = EndianU16_BtoN(frame->frameRect.bottom) - EndianU16_BtoN(frame->frameRect.top);	// image height in pixels
	idp->version = 0;										// the version of the compressed data

	// make up a color table, if there is one
	if (colorCount > 2) {
		short i;
		long ctSeed = GetCTSeed();

		colors = (CTabHandle)NewHandleClear(sizeof(long) + sizeof(short) * 2 + colorCount * sizeof(ColorSpec));
		if (err = MemError()) goto bail;

		(**colors).ctFlags = 0;
		(**colors).ctSeed = ctSeed;
		(**colors).ctSize = colorCount - 1;

		for (i=0; i<colorCount; i++) {
			(**colors).ctTable[i].value = i;
			(**colors).ctTable[i].rgb.red = ((UInt16)(color[0]) << 8) | color[0];
			(**colors).ctTable[i].rgb.green = ((UInt16)(color[1]) << 8) | color[1];
			(**colors).ctTable[i].rgb.blue = ((UInt16)(color[2]) << 8) | color[2];

			color += 3;
		}
		
		// copy the custom color table into the image description structure
		err = SetImageDescriptionCTable(desc, colors);
		if (err) goto bail;
	}

bail:
	if (colors)
		DisposeCTable(colors);

	if (desc && err) {
		DisposeHandle((Handle)desc);
		desc = NULL;
	}

	*descOut = desc;

	return err;
}
