// Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

// Guest Egl implementation of attributes and attribute lists

#include <e32debug.h>

#include "eglapi.h"

TInt TAttribUtils::AttribListLength(const EGLint* aAttribList)

	{

	int length = 0;

	if (aAttribList)

		{

		while (aAttribList[length] != EGL_NONE)

			{

			length += 2;

			EGLPANIC_ASSERT_DEBUG(length < 100, EEglPanicAtribListLengthTooLong);

			}

		++length;

		}

	return length;

	}

const EGLint* TAttribUtils::FindAttribValue(const EGLint* aAttribList, EGLint aAttrib)

	{

	EGLPANIC_ASSERT_DEBUG(aAttrib != EGL_NONE, EEglPanicTemp);

	if (aAttribList && (aAttrib != EGL_NONE) )

		{

		TInt idx = 0;

		while (aAttribList[idx] != EGL_NONE)

			{

			if (aAttribList[idx] == aAttrib)

				{

				return aAttribList + idx + 1;

				}

			idx += 2;

			EGLPANIC_ASSERT_DEBUG(idx < 100, EEglPanicAtribListLengthTooLong);

			}

		}

	return NULL;

	}

EGLint* TAttribUtils::FindAttribValue(EGLint* aAttribList, EGLint aAttrib)

	{

	EGLPANIC_ASSERT_DEBUG(aAttrib != EGL_NONE, EEglPanicTemp);

	if (aAttribList && (aAttrib != EGL_NONE) )

		{

		TInt idx = 0;

		while (aAttribList[idx] != EGL_NONE)

			{

			if (aAttribList[idx] == aAttrib)

				{

				return aAttribList + idx + 1;

				}

			idx += 2;

			EGLPANIC_ASSERT_DEBUG(idx < 100, EEglPanicAtribListLengthTooLong);

			}

		}

	return NULL;

	}

void TAttribUtils::AppendAttribValue(EGLint* aAttribList, EGLint aAttrib, EGLint aValue)

	{

	EGLPANIC_ASSERT_DEBUG(aAttrib != EGL_NONE, EEglPanicTemp);

	if (aAttribList && (aAttrib != EGL_NONE))

		{

		TInt idx = 0;

		while (aAttribList[idx] != EGL_NONE)

			{

			idx += 2;

			EGLPANIC_ASSERT_DEBUG(idx < 100, EEglPanicAtribListLengthTooLong);

			}

		aAttribList[idx++] = aAttrib;

		aAttribList[idx++] = aValue;

		aAttribList[idx++] = EGL_NONE;

		}

	}

void TAttribUtils::RemoveAttrib(EGLint* aAttribList, EGLint aAttrib)

	{

	EGLPANIC_ASSERT_DEBUG(aAttrib != EGL_NONE, EEglPanicTemp);

	if (aAttribList && (aAttrib != EGL_NONE) && (*aAttribList != EGL_NONE))

		{

		TInt dstIdx = 0;

		while ( (aAttribList[dstIdx] != EGL_NONE) && (aAttribList[dstIdx] != aAttrib) )

			{

			dstIdx += 2;

			EGLPANIC_ASSERT_DEBUG(dstIdx < 100, EEglPanicAtribListLengthTooLong);

			}

		if (aAttribList[dstIdx] == aAttrib)

			{ // attrib found

			TInt srcIdx = dstIdx + 2;

			while (aAttribList[srcIdx] != EGL_NONE)

				{ // copy up succeeding attrib / value pairs

				aAttribList[dstIdx++] = aAttribList[srcIdx++];

				aAttribList[dstIdx++] = aAttribList[srcIdx++];

				EGLPANIC_ASSERT_DEBUG(dstIdx < 100, EEglPanicAtribListLengthTooLong);

				}

			aAttribList[dstIdx++] = EGL_NONE;

			}

		}

	}

// end of file eglattrib.cpp