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/*
* $Id: RenderVToX.c 3177 2008-04-01 14:47:24Z karstenm $
*
* This file contains functions for rendering a Vista image into an XImage
* with respect to a Vista colormap (VColormap).
*/
/*
* Copyright 1993, 1994 University of British Columbia
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appears in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation. UBC makes no representations about the suitability of this
* software for any purpose. It is provided "as is" without express or
* implied warranty.
*
* Authors: Dan Razzell, Daniel Ko, Art Pope
* UBC Laboratory for Computational Intelligence
*/
/* From the Vista library: */
#include "viaio/Vlib.h"
#include "colormap.h"
#include "viaio/os.h"
#include "viaio/VImage.h"
#include "VImageVieP.h"
/* From X Windows libraries: */
#include <X11/IntrinsicP.h>
#include <X11/Xatom.h>
/* File identification string: */
VRcsId ("$Id: RenderVToX.c 3177 2008-04-01 14:47:24Z karstenm $");
/*
* V_RenderVToX
*
* Converts a Vista image into an XImage, dithered with respect to
* the supplied Vista colormap.
*
* ==> Instead of a widget, take vx, port, image, band, whether to
* display color, whether to dither absolute
*/
extern XImage *V_RenderVToX (VImageViewWidget vw)
{
VColormap vc = vw->viv.v_colormap;
struct V_Port *port = & vw->viv.port;
VBoolean color_image, color_display, use_stdcmap;
VImage vimage, dimage = NULL;
int band, nvalues[3], row, col;
unsigned long i, t;
VUByte *rp, *gp, *bp;
XImage *ximage = vw->viv.ximage;
char *xp_row, *xp;
/* Determine whether we're displaying a color image or a single band,
and whether it's on a color display or a grayscale one: */
color_image =
vw->viv.is_color && vw->viv.band + 2 < VImageNBands (vw->viv.image);
color_display =
vc->vinfo.class != StaticGray && vc->vinfo.class != GrayScale;
use_stdcmap = color_image && color_display;
/* If we're displaying a color image on a grayscale display, first
convert it to gray: */
if (color_image && ! color_display) {
if (! (vimage = VRGBImageToGray (vw->viv.image, NULL, vw->viv.band)))
return NULL;
band = 0;
} else {
vimage = vw->viv.image;
band = vw->viv.band;
}
/* Allocate an image to dither into: */
if (! (dimage = VCreateImage (use_stdcmap ? 3 : 1,
port->height, port->width, VUByteRepn)))
goto Return;
/* Dither into the appropriate range of shades: */
if (use_stdcmap) {
nvalues[0] = vc->stdcmap.red_max + 1;
nvalues[1] = vc->stdcmap.green_max + 1;
nvalues[2] = vc->stdcmap.blue_max + 1;
} else nvalues[0] = vc->ngrays;
if (! VDither (vimage, dimage, band,
port->first_row, port->first_column,
port->nrows, port->ncolumns, nvalues, vw->viv.absolute))
goto Return;
rp = VPixelPtr (dimage, 0, 0, 0);
if (use_stdcmap) {
gp = VPixelPtr (dimage, 1, 0, 0);
bp = VPixelPtr (dimage, 2, 0, 0);
}
#define ComputePixelValue(r,g,b) \
if (use_stdcmap) { \
t = r * vc->stdcmap.red_mult + g * vc->stdcmap.green_mult + \
b * vc->stdcmap.blue_mult; \
t = vc->indcmap ? \
vc->indcmap[t] : (t + vc->stdcmap.base_pixel) & 0xFFFFFFFF; \
} else t = vc->invgmap[r];
/* Look for common special cases: */
if (ximage->bytes_per_line == port->width) {
/* One-byte XImage pixels and no row padding: */
xp = ximage->data;
for (i = port->height * port->width; i > 0; i--) {
ComputePixelValue (*rp++, *gp++, *bp++);
*xp++ = t;
}
} else if (ximage->bits_per_pixel == CHAR_BIT) {
/* One-byte XImage pixels: */
for (row = 0, xp_row = ximage->data; row < port->height;
row++, xp_row += ximage->bytes_per_line) {
xp = xp_row;
for (col = 0; col < port->width; col++) {
ComputePixelValue (*rp++, *gp++, *bp++);
*xp++ = t;
}
}
} else {
/* General case: */
for (row = 0; row < port->height; row++)
for (col = 0; col < port->width; col++) {
ComputePixelValue (*rp++, *gp++, *bp++);
XPutPixel (ximage, col, row, t);
}
}
#undef ComputePixelValue
Return:
if (vimage != vw->viv.image)
VDestroyImage (vimage);
if (dimage)
VDestroyImage (dimage);
return ximage;
}
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