/*

    File:       EI_MakeImageDescription.c

    Description: Code which constructs an image description structure for the Electric Image

                 importer sample code.

    Author:     QuickTime Engineering

    Copyright:  © Copyright 1999-2003 Apple Computer, Inc. All rights reserved.

    Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple Computer, Inc.

                ("Apple") in consideration of your agreement to the following terms, and your

                use, installation, modification or redistribution of this Apple software

                constitutes acceptance of these terms.  If you do not agree with these terms,

                please do not use, install, modify or redistribute this Apple software.

                In consideration of your agreement to abide by the following terms, and subject

                to these terms, Apple grants you a personal, non-exclusive license, under AppleÕs

                copyrights in this original Apple software (the "Apple Software"), to use,

                reproduce, modify and redistribute the Apple Software, with or without

                modifications, in source and/or binary forms; provided that if you redistribute

                the Apple Software in its entirety and without modifications, you must retain

                this notice and the following text and disclaimers in all such redistributions of

                the Apple Software.  Neither the name, trademarks, service marks or logos of

                Apple Computer, Inc. may be used to endorse or promote products derived from the

                Apple Software without specific prior written permission from Apple.  Except as

                expressly stated in this notice, no other rights or licenses, express or implied,

                are granted by Apple herein, including but not limited to any patent rights that

                may be infringed by your derivative works or by other works in which the Apple

                Software may be incorporated.

                The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO

                WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED

                WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR

                PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN

                COMBINATION WITH YOUR PRODUCTS.

                IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR

                CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE

                GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

                ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION

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                (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN

                ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    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;

}