devdraw.org

the embedded GUI for SamSung s3c2410 cpu based board.is microwindows0.90

/*
 * Copyright (c) 1999, 2000, 2001 Greg Haerr <[e-mail]>
 * Portions Copyright (c) 2002 by Koninklijke Philips Electronics N.V.
 * Portions Copyright (c) 1991 David I. Bell
 * Permission is granted to use, distribute, or modify this source,
 * provided that this copyright notice remains intact.
 *
 * Device-independent mid level drawing and color routines.
 *
 * These routines do the necessary range checking, clipping, and cursor
 * overwriting checks, and then call the lower level device dependent
 * routines to actually do the drawing.  The lower level routines are
 * only called when it is known that all the pixels to be drawn are
 * within the device area and are visible.
 */
/*#define NDEBUG*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "device.h"

extern MWPIXELVAL gr_foreground;      /* current foreground color */
extern MWPIXELVAL gr_background;      /* current background color */
extern MWBOOL 	  gr_usebg;    	      /* TRUE if background drawn in pixmaps */
extern int 	  gr_mode; 	      /* drawing mode */
extern MWPALENTRY gr_palette[256];    /* current palette*/
extern int	  gr_firstuserpalentry;/* first user-changable palette entry*/
extern int 	  gr_nextpalentry;    /* next available palette entry*/

/* JHC - These support drawing dashed lines */
extern unsigned long gr_dashmask;     /* An actual bitmask of the dash values */
extern unsigned long gr_dashcount;    /* The number of bits defined in the dashmask */

extern int        gr_fillmode;

/*static*/ void drawpoint(PSD psd,MWCOORD x, MWCOORD y);

/*static*/ void drawrow(PSD psd,MWCOORD x1,MWCOORD x2,MWCOORD y);
static void drawcol(PSD psd,MWCOORD x,MWCOORD y1,MWCOORD y2);

/*
 * Set the drawing mode for future calls.
 */
int
GdSetMode(int mode)
{
	int	oldmode = gr_mode;

	gr_mode = mode;
	return oldmode;
}

int
GdSetFillMode(int mode)
{
	int oldmode = gr_fillmode;

	gr_fillmode = mode;
	return oldmode;
}

/*
 * Set whether or not the background is used for drawing pixmaps and text.
 */
MWBOOL
GdSetUseBackground(MWBOOL flag)
{
	MWBOOL	oldusebg = gr_usebg;

	gr_usebg = flag;
	return oldusebg;
}

/*
 * Set the foreground color for drawing.
 */
MWPIXELVAL
GdSetForeground(PSD psd, MWPIXELVAL fg)
{
	MWPIXELVAL	oldfg = gr_foreground;

	gr_foreground = fg;
	return oldfg;
}

/*
 * Set the background color for bitmap and text backgrounds.
 */
MWPIXELVAL
GdSetBackground(PSD psd, MWPIXELVAL bg)
{
	MWPIXELVAL	oldbg = gr_background;

	gr_background = bg;
	return oldbg;
}

/*
 * Set the foreground color for drawing.
 */
MWPIXELVAL
GdSetForegroundColor(PSD psd, MWCOLORVAL fg)
{
	MWPIXELVAL oldfg = gr_foreground;

	gr_foreground = GdFindColor(psd, fg);
	return oldfg;
}

/*
 * Set the background color for bitmap and text backgrounds.
 */
MWPIXELVAL
GdSetBackgroundColor(PSD psd, MWCOLORVAL bg)
{
	MWPIXELVAL oldbg = gr_background;

	gr_background = GdFindColor(psd, bg);
	return oldbg;
}

/* Set the dash mode for future drawing */
void
GdSetDash(unsigned long *mask, int *count)
{
	int oldm = gr_dashmask;
	int oldc = gr_dashcount;

	if (!mask || !count)
		return;

	gr_dashmask = *mask;
	gr_dashcount = *count;

	*mask = oldm;
	*count = oldc;
}

/*
 * Draw a point using the current clipping region and foreground color.
 */
void
GdPoint(PSD psd, MWCOORD x, MWCOORD y)
{
	if (GdClipPoint(psd, x, y)) {
		psd->DrawPixel(psd, x, y, gr_foreground);
		GdFixCursor(psd);
	}
}

/*
 * Draw an arbitrary line using the current clipping region and foreground color
 * If bDrawLastPoint is FALSE, draw up to but not including point x2, y2.
 *
 * This routine is the only routine that adjusts coordinates for supporting
 * two different types of upper levels, those that draw the last point
 * in a line, and those that draw up to the last point.  All other local
 * routines draw the last point.  This gives this routine a bit more overhead,
 * but keeps overall complexity down.

 */

void
GdLine(PSD psd, MWCOORD x1, MWCOORD y1, MWCOORD x2, MWCOORD y2,
       MWBOOL bDrawLastPoint) 
{ 
  int xdelta;			/* width of rectangle around line */
  int ydelta;			/* height of rectangle around line */
  int xinc;			/* increment for moving x coordinate */
  int yinc;			/* increment for moving y coordinate */
  int rem;			/* current remainder */
  MWCOORD temp;
  
  int bit = 0;                      /* Used for dashed lines */

  /* See if the line is horizontal or vertical. If so, then call
   * special routines.
   */
  if (y1 == y2) {
	/*
	 * Adjust coordinates if not drawing last point.  Tricky.
	 */
	if(!bDrawLastPoint) {
		if (x1 > x2) {
			temp = x1;
			x1 = x2 + 1;
			x2 = temp;
		} else
			--x2;
	}

	/* call faster line drawing routine*/

	drawrow(psd, x1, x2, y1);
	GdFixCursor(psd);
	return;
  }
  if (x1 == x2) {
	/*
	 * Adjust coordinates if not drawing last point.  Tricky.
	 */
	if(!bDrawLastPoint) {
		if (y1 > y2) {
			temp = y1;
			y1 = y2 + 1;
			y2 = temp;
		} else
			--y2;
	}

	/* call faster line drawing routine */
	drawcol(psd, x1, y1, y2);
	GdFixCursor(psd);
	return;
  }

  /* See if the line is either totally visible or totally invisible. If
   * so, then the line drawing is easy.
   */
  switch (GdClipArea(psd, x1, y1, x2, y2)) {
      case CLIP_VISIBLE:
	/*
	 * For size considerations, there's no low-level bresenham
	 * line draw, so we've got to draw all non-vertical
	 * and non-horizontal lines with per-point
	 * clipping for the time being
	psd->Line(psd, x1, y1, x2, y2, gr_foreground);
	GdFixCursor(psd);
	return;
	 */
	break;
      case CLIP_INVISIBLE:
	return;
  }

  /* The line may be partially obscured. Do the draw line algorithm
   * checking each point against the clipping regions.
   */
  xdelta = x2 - x1;
  ydelta = y2 - y1;
  if (xdelta < 0) xdelta = -xdelta;
  if (ydelta < 0) ydelta = -ydelta;
  xinc = (x2 > x1) ? 1 : -1;
  yinc = (y2 > y1) ? 1 : -1;
  if (GdClipPoint(psd, x1, y1))
	  psd->DrawPixel(psd, x1, y1, gr_foreground);
  if (xdelta >= ydelta) {
	rem = xdelta / 2;
	for(;;) {
		if(!bDrawLastPoint && x1 == x2)
			break;
		x1 += xinc;
		rem += ydelta;
		if (rem >= xdelta) {
			rem -= xdelta;
			y1 += yinc;
		}

		if (gr_dashcount) {
		  if (GdClipPoint(psd, x1, y1) && (gr_dashmask & (1 << bit)))
		    psd->DrawPixel(psd, x1, y1, gr_foreground);
		  
		  bit = (bit + 1) % gr_dashcount;
		}
		else {  /* No dashes */
		if (GdClipPoint(psd, x1, y1))
			psd->DrawPixel(psd, x1, y1, gr_foreground);
		}

		if(bDrawLastPoint && x1 == x2)
		  break;
		
	}
  } else {
	rem = ydelta / 2;
	for(;;) {
		if(!bDrawLastPoint && y1 == y2)
			break;
		y1 += yinc;
		rem += xdelta;
		if (rem >= ydelta) {
			rem -= ydelta;
			x1 += xinc;
		}

		/* If we are trying to draw to a dash mask */

		if (gr_dashcount) {
		  if (GdClipPoint(psd, x1, y1) && (gr_dashmask & (1 << bit)))
		    psd->DrawPixel(psd, x1, y1, gr_foreground);
		  
		  bit = (bit + 1) % gr_dashcount;
		}
		else {  /* No dashes */
		if (GdClipPoint(psd, x1, y1))
			psd->DrawPixel(psd, x1, y1, gr_foreground);
		}

		if(bDrawLastPoint && y1 == y2)
		  break;
	}
  }
  GdFixCursor(psd);
}

/* Draw a point in the foreground color, applying clipping if necessary*/
/*static*/ void
drawpoint(PSD psd, MWCOORD x, MWCOORD y)
{
	if (GdClipPoint(psd, x, y))
		psd->DrawPixel(psd, x, y, gr_foreground);
}

/* Draw a horizontal line from x1 to and including x2 in the
 * foreground color, applying clipping if necessary.
 */
/*static*/ void
drawrow(PSD psd, MWCOORD x1, MWCOORD x2, MWCOORD y)
{
  MWCOORD temp;

  /* reverse endpoints if necessary*/
  if (x1 > x2) {
	temp = x1;
	x1 = x2;
	x2 = temp;
  }

  /* clip to physical device*/
  if (x1 < 0)
	  x1 = 0;
  if (x2 >= psd->xvirtres)
	  x2 = psd->xvirtres - 1;

  /* check cursor intersect once for whole line*/
  GdCheckCursor(psd, x1, y, x2, y);

  /* If aren't trying to draw a dash, then head for the speed */

  if (!gr_dashcount) {

    while (x1 <= x2) {
      if (GdClipPoint(psd, x1, y)) {
	temp = MWMIN(clipmaxx, x2);
	psd->DrawHorzLine(psd, x1, temp, y, gr_foreground);
      } else
	temp = MWMIN(clipmaxx, x2);
      x1 = temp + 1;
    }
  }
  else {
    int p, bit = 0;

    /* We want to draw a dashed line instead */

    for(p = x1; p <= x2; p++) {
      if (GdClipPoint(psd, p, y) && (gr_dashmask & (1 << bit)))
	psd->DrawPixel(psd, p, y, gr_foreground);
    
      bit = (bit + 1) % gr_dashcount;
    }
  }
}

/* Draw a vertical line from y1 to and including y2 in the
 * foreground color, applying clipping if necessary.
 */
static void
drawcol(PSD psd, MWCOORD x,MWCOORD y1,MWCOORD y2)
{
  MWCOORD temp;

  /* reverse endpoints if necessary*/
  if (y1 > y2) {
	temp = y1;
	y1 = y2;
	y2 = temp;
  }

  /* clip to physical device*/
  if (y1 < 0)
	  y1 = 0;
  if (y2 >= psd->yvirtres)
	  y2 = psd->yvirtres - 1;

  /* check cursor intersect once for whole line*/
  GdCheckCursor(psd, x, y1, x, y2);

  if (!gr_dashcount) {
    while (y1 <= y2) {
      if (GdClipPoint(psd, x, y1)) {
	temp = MWMIN(clipmaxy, y2);
	psd->DrawVertLine(psd, x, y1, temp, gr_foreground);
      } else
	temp = MWMIN(clipmaxy, y2);
      y1 = temp + 1;
    }
  }
  else {
    int p, bit = 0;
    
    /* We want to draw a dashed line instead */

    for(p = y1; p <= y2; p++) {
      if (GdClipPoint(psd, x, p) && (gr_dashmask & (1 << bit)))
	psd->DrawPixel(psd, x, p, gr_foreground);
    
      bit = (bit + 1) % gr_dashcount;
    }
  }
}

/* Draw a rectangle in the foreground color, applying clipping if necessary.
 * This is careful to not draw points multiple times in case the rectangle
 * is being drawn using XOR.
 */
void
GdRect(PSD psd, MWCOORD x, MWCOORD y, MWCOORD width, MWCOORD height)
{
  MWCOORD maxx;
  MWCOORD maxy;

  if (width <= 0 || height <= 0)
	  return;
  maxx = x + width - 1;
  maxy = y + height - 1;
  drawrow(psd, x, maxx, y);
  if (height > 1)
	  drawrow(psd, x, maxx, maxy);
  if (height < 3)
	  return;
  y++;
  maxy--;
  drawcol(psd, x, y, maxy);
  if (width > 1)
	  drawcol(psd, maxx, y, maxy);
  GdFixCursor(psd);
}

/* Draw a filled in rectangle in the foreground color, applying
 * clipping if necessary.
 */
void
GdFillRect(PSD psd, MWCOORD x1, MWCOORD y1, MWCOORD width, MWCOORD height)
{
  unsigned long dm = 0, dc = 0;

  MWCOORD x2 = x1+width-1;
  MWCOORD y2 = y1+height-1;

  if (width <= 0 || height <= 0)
	  return;

  /* Stipples and tiles have their own drawing routines */
  
  if (gr_fillmode != MWFILL_SOLID) {
    set_ts_origin(x1, y1);

    ts_fillrect(psd, x1, y1, width, height);
    GdFixCursor(psd);
    return;
  }

  /* See if the rectangle is either totally visible or totally
   * invisible. If so, then the rectangle drawing is easy.
   */

  switch (GdClipArea(psd, x1, y1, x2, y2)) {
      case CLIP_VISIBLE:
	psd->FillRect(psd, x1, y1, x2, y2, gr_foreground);
	GdFixCursor(psd);
	return;

      case CLIP_INVISIBLE:
	return;
  }

  /* The rectangle may be partially obstructed. So do it line by line. */

  /* Quickly save off the dash settings to avoid problems with drawrow */

  GdSetDash(&dm, (int *) &dc);

  while (y1 <= y2) 
	  drawrow(psd, x1, x2, y1++);

  /* Restore the dash settings */

  GdSetDash(&dm, (int *) &dc);

  GdFixCursor(psd);
}

/*
 * Draw a rectangular area using the current clipping region and the
 * specified bit map.  This differs from rectangle drawing in that the
 * rectangle is drawn using the foreground color and possibly the background
 * color as determined by the bit map.  Each row of bits is aligned to the
 * next bitmap word boundary (so there is padding at the end of the row).
 * The background bit values are only written if the gr_usebg flag
 * is set.
 */
void
GdBitmap(PSD psd, MWCOORD x, MWCOORD y, MWCOORD width, MWCOORD height,
	MWIMAGEBITS *imagebits)
{
  MWCOORD minx;
  MWCOORD maxx;
  MWPIXELVAL savecolor;		/* saved foreground color */
  MWIMAGEBITS bitvalue = 0;	/* bitmap word value */
  int bitcount;			/* number of bits left in bitmap word */

  switch (GdClipArea(psd, x, y, x + width - 1, y + height - 1)) {
      case CLIP_VISIBLE:
	/*
	 * For size considerations, there's no low-level bitmap
	 * draw so we've got to draw everything with per-point
	 * clipping for the time being.
	if (gr_usebg)
		psd->FillRect(psd, x, y, x + width - 1, y + height - 1,
			gr_background);
	psd->DrawBitmap(psd, x, y, width, height, imagebits, gr_foreground);
	return;
	*/
	break;

      case CLIP_INVISIBLE:
	return;
  }

  /* The rectangle is partially visible, so must do clipping. First
   * fill a rectangle in the background color if necessary.
   */
  if (gr_usebg) {
	savecolor = gr_foreground;
	gr_foreground = gr_background;
	/* note: change to fillrect*/
	GdFillRect(psd, x, y, width, height);
	gr_foreground = savecolor;
  }
  minx = x;
  maxx = x + width - 1;
  bitcount = 0;
  while (height > 0) {
	if (bitcount <= 0) {
		bitcount = MWIMAGE_BITSPERIMAGE;
		bitvalue = *imagebits++;
	}
	if (MWIMAGE_TESTBIT(bitvalue) && GdClipPoint(psd, x, y))
		psd->DrawPixel(psd, x, y, gr_foreground);
	bitvalue = MWIMAGE_SHIFTBIT(bitvalue);
	bitcount--;
	if (x++ == maxx) {
		x = minx;
		y++;
		height--;
		bitcount = 0;
	}
  }
  GdFixCursor(psd);
}

/*
 * Return true if color is in palette
 */
MWBOOL
GdColorInPalette(MWCOLORVAL cr,MWPALENTRY *palette,int palsize)
{
	int	i;

	for(i=0; i<palsize; ++i)
		if(GETPALENTRY(palette, i) == cr)
			return TRUE;
	return FALSE;
}

/*
 * Create a MWPIXELVAL conversion table between the passed palette
 * and the in-use palette.  The system palette is loaded/merged according
 * to fLoadType.
 */
void