editor.c

嵌入式GUI OpenGL源代码。OpenGL是嵌入式开发中常用的一种GUI系统。

/*===========================================================================*
 *
 *				YACME
 *			Yet Another ColorMap Editor
 *
 *			Patrick BOUCHAUD - 1993
 *                          SGI Switzerland
 *
 *                    Converted to OpenGL using GLUT
 *
 *===========================================================================*/

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include <GL/glut.h>

#include "mallocbis.h"

/* For portability... */
#undef fsqrt
#define fsqrt(_a)     sqrt(_a)

#define	SUP(a,b)	( ((a)>(b)) ? (a) : (b) )
#define	INF(a,b)	( ((a)<(b)) ? (a) : (b) )
#define	ABS(a)		( ((a)<0) ? -(a) : (a) )
#define	POINT		1
#define	CURVE		2
#define	LEFT_TAN	3
#define	RIGHT_TAN	4
#define	MANUAL		1
#define	CONTINUOUS	2

#define	CONSTANT	1
#define	LINEAR		2
#define	POLYNOMIAL	3

#define	TabCmpnt(c,n)	TabCmpnt[(n)*4+(c)]

#define	MAXNDX	(dimlut-1)

#define	WINHEIGHT	381
#define	WINWIDTH	318

#define LUTRATIO	((float)MAXNDX/255.)

#define	LEFT		LUTRATIO*(-5.)
#define	RIGHT		LUTRATIO*(260.)
#define	BOTTOM		LUTRATIO*(-5.)
#define	TOP			LUTRATIO*(315.)
#define	TANLEN		LUTRATIO*(25.)

typedef float Matrix[4][4];

typedef struct	{
	float	x0, y0,
		x1, y1;
} Tangente;

typedef struct UserPointStruct	{

	float		x, y;
	Tangente	tg;
	int			mode;
	float		polynome[4];
	struct		UserPointStruct *next, *last;

} UserPoint;

void ResetCMap(void);
void ApplyCMap(void);
void YACME_makeMenu(void);
extern void invertmat(float from[4][4], float to[4][4]);

static UserPoint *FreePointList = NULL;
#define	newPoint( point ) newItem( point, FreePointList, UserPoint )
#define	freePoint( point ) freeItem( point, FreePointList )

typedef struct	{
	int	type,
		cmpnt,
		ndx;

	UserPoint *upoint;
} PickObject;

struct {
	int leftdown, middledown, rightdown;
} mouse;

void YACME_pick( int mx, int my, PickObject *obj );
void YACME_update( int cmpnt, UserPoint *upoint );
int	YACME_get( unsigned long *table );

void	DeletePoint( int cmpnt, UserPoint *upoint );
int	MovePoint( int, int );
int	MoveTangente( int, int, int );
int	InsertPoint( PickObject *obj );

void	GetPolynome( int mode,
		float a0, float b0, float t0,
		float a1, float b1, float t1,
		float coeff[4] );
void	OrthoTransform( int mx, int my, float *x, float *y );
float	Polynome4( float x, float *polynome );

static int	DrawCurve[4] = { 1, 1, 1, 1, },
		modifiedCurve[4] = { 1, 1, 1, 1 },
		YACME_refresh = MANUAL,
		curCmpnt = 0, curType = 0,
		Mousex, Mousey;

static float *TabCmpnt;
static int	YACME_switch_menu = 0,
	YACME_mode_menu, YACME_edit_menu;
static int YACME_win = 0, W, H , update = 0;
static UserPoint *userPoint[4], *userPointSvg[4], *curPoint = NULL;

static void Redraw( void );
static void Reshape( int, int );
static void Mouse( int, int, int, int );
static void Motion( int, int );
static void Key( unsigned char, int, int );
static void Special( int, int, int );
static void YACME_menuFunc( int );

typedef void (*CallBack)(void);
static CallBack newmapCB, applyCB;
static int dimlut;

/*---------------------------------------------------------------------------*
 *			YACME_init
 *---------------------------------------------------------------------------*/
void
YACME_init(
	int x, int y, int w, int h,
	int dim, float **list,
	CallBack newmapFunc, CallBack applyFunc)
{
	int	i, j;
	UserPoint *userpoint;

	if (YACME_win) return;

	dimlut = dim;
	newmapCB = newmapFunc;
	applyCB = applyFunc;

	if (*list==NULL)
	{
		*list = TabCmpnt = (float *) malloc( 4*dimlut*sizeof(float) );
		for (i=0; i<4; i++)
		{
			newPoint( userPoint[i] );
			userpoint = userPoint[i];
			userpoint->mode = POLYNOMIAL;
			userpoint->x = 0.;
			userpoint->y = 0.;
			userpoint->last	= NULL;
			userpoint->tg.x0 = 0.;
			userpoint->tg.y0 = 0.;
			userpoint->tg.x1 = TANLEN;
			userpoint->tg.y1 = 0.;
	
			newPoint( userpoint->next );
			userpoint = userpoint->next;
			userpoint->mode = POLYNOMIAL;
			userpoint->x = (float)MAXNDX;
			userpoint->y = (float)MAXNDX;
			userpoint->last	= userPoint[i];
			userpoint->next	= NULL;
			userpoint->tg.x0 = (float)(MAXNDX-TANLEN);
			userpoint->tg.y0 = (float)MAXNDX;
			userpoint->tg.x1 = (float)MAXNDX;
			userpoint->tg.y1 = (float)MAXNDX;
		}
	}
	else
	{
		UserPoint *upoint[4], *lastupoint[4]={0,0,0,0};

		TabCmpnt = *list;
		for (i=0; i<dim; i++)
		{
			for (j=0; j<4; j++)
			{
				if (i==0)
				{
					newPoint( userPoint[j] );
					upoint[j] = userPoint[j];
				}
				else
				{
					newPoint( upoint[j]->next );
					upoint[j] = upoint[j]->next;
				}
				upoint[j]->next = NULL;
				upoint[j]->last = lastupoint[j];
				upoint[j]->mode = LINEAR;
				upoint[j]->x = (float)i;
				upoint[j]->y = (float)MAXNDX*TabCmpnt(j,i);
				if (i==0)
				{
					upoint[j]->tg.x0 = 0.;
					upoint[j]->tg.y0 = 0.;
					upoint[j]->tg.x1 = TANLEN;
					upoint[j]->tg.y1 = 0.;
				}
				else
				{
					float	slope = upoint[j]->y - upoint[j]->last->y,
							dx = TANLEN/fsqrt(slope*slope + 1),
							dy = slope*dx;
					upoint[j]->tg.x0 = upoint[j]->x - dx;
					upoint[j]->tg.y0 = upoint[j]->y - dy;
					upoint[j]->tg.x1 = upoint[j]->x + dx;
					upoint[j]->tg.y1 = upoint[j]->y + dy;
				}

				lastupoint[j] = upoint[j];
			}
		}
	}

/*
	TabComponents update
	--------------------
*/
	for (i=0; i<4; i++)
	{
		for (userpoint=userPoint[i]; userpoint!=NULL; userpoint=userpoint->next)
			YACME_update( i, userpoint );
	}
	ApplyCMap();

	if (!YACME_win)
	{
		glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
		glutInitWindowPosition( x, y );
		glutInitWindowSize( w, h );
		YACME_win = glutCreateWindow( "LUT editor" );
		glutDisplayFunc( Redraw );
		glutReshapeFunc( Reshape );
		glutMouseFunc( Mouse );
		glutMotionFunc( Motion );
		glutPassiveMotionFunc( Motion );
		glutSpecialFunc( Special );
		glutKeyboardFunc( Key );
		
		glMatrixMode( GL_PROJECTION );
		glLoadIdentity();
		glOrtho( LEFT, RIGHT, BOTTOM, TOP, -1., 1. );

		glClearColor( 0.66, 0.66, 0.66, 1. );
		glClear( GL_COLOR_BUFFER_BIT );
		glShadeModel( GL_FLAT );
		glutSwapBuffers();

		YACME_makeMenu();
	}
}

/*---------------------------------------------------------------------------*
 *	Key
 *---------------------------------------------------------------------------*/
/* ARGSUSED1 */
static void
Key( unsigned char key, int x, int y )
{
	UserPoint *previousPoint;
	switch (key)
	{
		case 27:	/* Escape */
			exit(0);
			break;

		case 127:	/* BackSpace */
		case 8:		/* Delete */
			if (!curPoint) return;
			previousPoint = (curPoint->last ? curPoint->last : userPoint[curCmpnt]);
			DeletePoint( curCmpnt, curPoint );
			modifiedCurve[curCmpnt] = 1;
			update = 1;
			curPoint = previousPoint;
			break;
	}
	glutPostRedisplay();
}

/*---------------------------------------------------------------------------*
 *      Special
 *---------------------------------------------------------------------------*/
/* ARGSUSED1 */
static void
Special( int key, int xx, int yy )
{
	int x, y, minx, maxx;
	float dx, dy;
	if (curPoint == NULL ) return;
	if (curPoint->next == NULL) return;
	if (curPoint->last == NULL) return;

	x = (int)curPoint->x;
	y = (int)curPoint->y;

	minx = (int)curPoint->last->x; minx++;
	maxx = (int)curPoint->next->x; maxx--;

	switch (key)
	{
		case GLUT_KEY_LEFT:
			if (x > minx) x--;
			break;

		case GLUT_KEY_RIGHT:
			if (x < maxx) x++;
			break;

		case GLUT_KEY_UP:
			if (y < MAXNDX) y++;
			break;

		case GLUT_KEY_DOWN:
			if (y > 0) y--;
			break;
	}

	dx = (float)x - curPoint->x;
	curPoint->x += dx;
	curPoint->tg.x0 += dx;
	curPoint->tg.x1 += dx;

	dy = (float)y - curPoint->y;
	curPoint->y = y;
	curPoint->tg.y0 += dy;
	curPoint->tg.y1 += dy;

	update = 1;
	glutPostRedisplay();
}

/*---------------------------------------------------------------------------*
 *	Reshape
 *---------------------------------------------------------------------------*/
static void
Reshape( int w, int h )
{
	glViewport( 0, 0, w, h );
	W = w;
	H = h;
	glutPostRedisplay();
}

/*---------------------------------------------------------------------------*
 *	Mouse
 *---------------------------------------------------------------------------*/
static void
Mouse( int button, int state, int x, int y )
{
	PickObject	object;

	y = H-y;
	switch (button)
	{
		case GLUT_RIGHT_BUTTON:
			mouse.rightdown = (state==GLUT_DOWN);
			break;

		case GLUT_MIDDLE_BUTTON:
			mouse.middledown = (state==GLUT_DOWN);
			break;

		case GLUT_LEFT_BUTTON:
			mouse.leftdown = (state==GLUT_DOWN);
			if (mouse.leftdown)
			{
				YACME_pick( x, y, &object );
				curType = object.type;
				switch ( object.type )
				{
					case CURVE:
						if ((curType = InsertPoint( &object ) != 0))
						{
							curPoint = object.upoint;
							curCmpnt = object.cmpnt;
						}
						else curPoint = NULL;
						break;

					case POINT:
					case LEFT_TAN:
					case RIGHT_TAN:
						curPoint = object.upoint;
						curCmpnt = object.cmpnt;
						break;

					default:
						curPoint = NULL;
			}
			break;
		}
	}
	glutPostRedisplay();
}

/*---------------------------------------------------------------------------*
 *	Motion
 *---------------------------------------------------------------------------*/
static void
Motion( int x, int y )
{
	Mousex = x;
	Mousey = H-y;
	if (mouse.leftdown)
	{
		switch (curType)
		{
			case POINT:
				update = MovePoint( Mousex, Mousey );
				break;

			case LEFT_TAN:
				update = MoveTangente( -1, Mousex, Mousey );
				break;

			case RIGHT_TAN:
				update = MoveTangente( 1, Mousex, Mousey );
				break;
		}
	}
	glutPostRedisplay();
}

/*---------------------------------------------------------------------------*
 *			YACME_makeMenu
 *---------------------------------------------------------------------------*/

#define	CONTINUOUS_ITEM	5
#define	MANUAL_ITEM		4
#define	APPLY_ITEM		3
#define	RESET_ITEM		2
#define	CLOSE_ITEM		1

#define	RED_ITEM	10
#define	GREEN_ITEM	11
#define	BLUE_ITEM	12
#define	ALPHA_ITEM	13

#define	CONSTANT_ITEM	22
#define	LINEAR_ITEM		21
#define	POLYNOM_ITEM	20

#define	EDIT_RED_ITEM	30
#define	EDIT_GREEN_ITEM	31
#define	EDIT_BLUE_ITEM	32
#define	EDIT_ALPHA_ITEM	33