initial gs5.84 checkin with pcl and xl compiling.

git-svn-id: http://svn.ghostscript.com/ghostpcl/trunk/ghostpcl@857 06663e23-700e-0410-b217-a244a6096597

1 files changed, 806 insertions, 0 deletions

diff --git a/gs/src/gdevxcmp.c b/gs/src/gdevxcmp.c
new file mode 100644
index 000000000..6d042a248
--- /dev/null
+++ b/gs/src/gdevxcmp.c
@@ -0,0 +1,806 @@
+/* Copyright (C) 1999 Aladdin Enterprises.  All rights reserved.
+
+   This file is part of Aladdin Ghostscript.
+
+   Aladdin Ghostscript is distributed with NO WARRANTY OF ANY KIND.  No author
+   or distributor accepts any responsibility for the consequences of using it,
+   or for whether it serves any particular purpose or works at all, unless he
+   or she says so in writing.  Refer to the Aladdin Ghostscript Free Public
+   License (the "License") for full details.
+
+   Every copy of Aladdin Ghostscript must include a copy of the License,
+   normally in a plain ASCII text file named PUBLIC.  The License grants you
+   the right to copy, modify and redistribute Aladdin Ghostscript, but only
+   under certain conditions described in the License.  Among other things, the
+   License requires that the copyright notice and this notice be preserved on
+   all copies.
+ */
+
+
+/* X Windows color mapping */
+#include "math_.h"
+#include "x_.h"
+#include "gx.h"			/* for gx_bitmap; includes std.h */
+#include "gserrors.h"
+#include "gxdevice.h"
+#include "gdevx.h"
+
+/* ---------------- Utilities ---------------- */
+
+private void
+gs_x_free(void *obj, client_name_t cname)
+{
+    gs_free(obj, 0 /*ignored*/, 0 /*ignored*/, cname);
+}
+
+/* ---------------- Color mapping setup / cleanup ---------------- */
+
+#if HaveStdCMap
+/* Get the Standard colormap if available. */
+/* Uses: dpy, scr, cmap. */
+private XStandardColormap *
+x_get_std_cmap(gx_device_X * xdev, Atom prop)
+{
+    int i;
+    XStandardColormap *scmap, *sp;
+    int nitems;
+
+    if (XGetRGBColormaps(xdev->dpy, RootWindowOfScreen(xdev->scr),
+			 &scmap, &nitems, prop))
+	for (i = 0, sp = scmap; i < nitems; i++, sp++)
+	    if (xdev->cmap == sp->colormap)
+		return sp;
+
+    return NULL;
+}
+
+/* Create a Standard colormap for a TrueColor or StaticGray display. */
+/* Return true if the allocation was successful. */
+/* Uses: vinfo.  Sets: std_cmap, free_std_cmap. */
+private bool
+alloc_std_cmap(gx_device_X *xdev, bool colored)
+{
+    XStandardColormap *cmap = XAllocStandardColormap();
+
+    if (cmap == 0)
+	return false;		/* can't allocate */
+    /*
+     * Some buggy X servers (including XFree86) don't set any of the
+     * _mask values for StaticGray visuals.  Compensate for that here.
+     */
+    if ((cmap->red_max = xdev->vinfo->red_mask) == 0) {
+	cmap->red_max = (1 << xdev->vinfo->depth) - 1;
+	cmap->red_mult = 1;
+    } else {
+	for (cmap->red_mult = 1; (cmap->red_max & 1) == 0;) {
+	    cmap->red_max >>= 1;
+	    cmap->red_mult <<= 1;
+	}
+    }
+    if (colored) {
+	for (cmap->green_max = xdev->vinfo->green_mask, cmap->green_mult = 1;
+	     (cmap->green_max & 1) == 0;
+	     ) {
+	    cmap->green_max >>= 1;
+	    cmap->green_mult <<= 1;
+	}
+	for (cmap->blue_max = xdev->vinfo->blue_mask, cmap->blue_mult = 1;
+	     (cmap->blue_max & 1) == 0;
+	     ) {
+	    cmap->blue_max >>= 1;
+	    cmap->blue_mult <<= 1;
+	}
+    }
+    xdev->cman.std_cmap = cmap;
+    xdev->cman.free_std_cmap = true;
+    return true;
+}
+#endif
+
+/* Allocate the dynamic color table, if needed and possible. */
+/* Uses: vinfo, cman.num_rgb.  Sets: cman.dynamic.*. */
+private void
+alloc_dynamic_colors(gx_device_X * xdev, int num_colors)
+{
+    if (num_colors > 0) {
+	xdev->cman.dynamic.colors = (x11_color_t **)
+	    gs_malloc(sizeof(x11_color_t *), xdev->cman.num_rgb,
+		      "x11 cman.dynamic.colors");
+	if (xdev->cman.dynamic.colors) {
+	    int i;
+
+	    xdev->cman.dynamic.size = xdev->cman.num_rgb;
+	    xdev->cman.dynamic.shift = 16 - xdev->vinfo->bits_per_rgb;
+	    for (i = 0; i < xdev->cman.num_rgb; i++)
+		xdev->cman.dynamic.colors[i] = NULL;
+	    xdev->cman.dynamic.max_used = min(256, num_colors);
+	    xdev->cman.dynamic.used = 0;
+	}
+    }
+}
+
+/* Allocate an X color, updating the reverse map. */
+/* Return true if the allocation was successful. */
+private bool
+x_alloc_color(gx_device_X *xdev, XColor *xcolor)
+{
+    x11_rgb_t rgb;
+
+    rgb.rgb[0] = xcolor->red;
+    rgb.rgb[1] = xcolor->green;
+    rgb.rgb[2] = xcolor->blue;
+    if (!XAllocColor(xdev->dpy, xdev->cmap, xcolor))
+	return false;
+    if (xcolor->pixel < xdev->cman.color_to_rgb.size) {
+	x11_rgb_t *pxrgb = &xdev->cman.color_to_rgb.values[xcolor->pixel];
+
+	memcpy(pxrgb->rgb, rgb.rgb, sizeof(rgb.rgb));
+	pxrgb->defined = true;
+    }
+    return true;
+}
+
+/* Free X colors, updating the reverse map. */
+private void
+x_free_colors(gx_device_X *xdev, x_pixel *pixels /*[count]*/, int count)
+{
+    int i;
+    x_pixel pixel;
+
+    XFreeColors(xdev->dpy, xdev->cmap, pixels, count, 0);
+    for (i = 0; i < count; ++i)
+	if ((pixel = pixels[i]) < xdev->cman.color_to_rgb.size)
+	    xdev->cman.color_to_rgb.values[pixel].defined = false;
+}
+
+/* Free a partially filled color cube or ramp. */
+/* Uses: dpy, cmap.  Uses and sets: cman.dither_ramp. */
+private void
+free_ramp(gx_device_X * xdev, int num_used, int size)
+{
+    if (num_used - 1 > 0)
+	x_free_colors(xdev, xdev->cman.dither_ramp + 1, num_used - 1);
+    gs_x_free(xdev->cman.dither_ramp, "x11_setup_colors");
+    xdev->cman.dither_ramp = NULL;
+}
+
+/* Allocate and fill in a color cube or ramp. */
+/* Return true if the operation succeeded. */
+/* Uses: dpy, cmap, foreground, background, cman.color_mask. */
+/* Sets: cman.dither_ramp. */
+private bool
+setup_cube(gx_device_X * xdev, int ramp_size, bool colors)
+{
+    int step, num_entries;
+    int max_rgb = ramp_size - 1;
+    int index;
+
+    if (colors) {
+	num_entries = ramp_size * ramp_size * ramp_size;
+	step = 1;		/* all colors */
+    } else {
+	num_entries = ramp_size;
+	step = (ramp_size + 1) * ramp_size + 1;		/* gray only */
+    }
+
+    xdev->cman.dither_ramp =
+	(x_pixel *) gs_malloc(sizeof(x_pixel), num_entries,
+			      "gdevx setup_cube");
+    if (xdev->cman.dither_ramp == NULL)
+	return false;
+
+    xdev->cman.dither_ramp[0] = xdev->foreground;
+    xdev->cman.dither_ramp[num_entries - 1] = xdev->background;
+    for (index = 1; index < num_entries - 1; index++) {
+	int rgb_index = index * step;
+	int q = rgb_index / ramp_size,
+	    r = q / ramp_size,
+	    g = q % ramp_size,
+	    b = rgb_index % ramp_size;
+	XColor xc;
+
+	xc.red = (X_max_color_value * r / max_rgb) & xdev->cman.color_mask.red;
+	xc.green = (X_max_color_value * g / max_rgb) & xdev->cman.color_mask.green;
+	xc.blue = (X_max_color_value * b / max_rgb) & xdev->cman.color_mask.blue;
+	if (!x_alloc_color(xdev, &xc)) {
+	    free_ramp(xdev, index, num_entries);
+	    return false;
+	}
+	xdev->cman.dither_ramp[index] = xc.pixel;
+    }
+
+    return true;
+}
+
+/* Setup color mapping. */
+int
+gdev_x_setup_colors(gx_device_X * xdev)
+{
+    char palette =
+	((xdev->vinfo->class != StaticGray) &&
+	 (xdev->vinfo->class != GrayScale) ? 'C' :	/* Color */
+	 (xdev->vinfo->colormap_size > 2) ? 'G' :		/* GrayScale */
+	 'M');		/* MonoChrome */
+
+    if (xdev->ghostview) {
+	Atom gv_colors = XInternAtom(xdev->dpy, "GHOSTVIEW_COLORS", False);
+	Atom type;
+	int format;
+	unsigned long nitems, bytes_after;
+	char *buf;
+
+	/* Delete property if explicit dest is given */
+	if (XGetWindowProperty(xdev->dpy, xdev->win, gv_colors, 0,
+			       256, (xdev->dest != 0), XA_STRING,
+			       &type, &format, &nitems, &bytes_after,
+			       (unsigned char **)&buf) == 0 &&
+	    type == XA_STRING) {
+	    nitems = sscanf(buf, "%*s %ld %ld", &(xdev->foreground),
+			    &(xdev->background));
+	    if (nitems != 2 || (*buf != 'M' && *buf != 'G' && *buf != 'C')) {
+		eprintf("Malformed GHOSTVIEW_COLOR property.\n");
+		return_error(gs_error_rangecheck);
+	    }
+	    palette = max(palette, *buf);
+	}
+    } else {
+	if (xdev->palette[0] == 'c')
+	    xdev->palette[0] = 'C';
+	else if (xdev->palette[0] == 'g')
+	    xdev->palette[0] = 'G';
+	else if (xdev->palette[0] == 'm')
+	    xdev->palette[0] = 'M';
+	palette = max(palette, xdev->palette[0]);
+    }
+
+    /* set up color mappings here */
+    xdev->cman.color_mask.red = xdev->cman.color_mask.green =
+	xdev->cman.color_mask.blue = X_max_color_value -
+	  (X_max_color_value >> xdev->vinfo->bits_per_rgb);
+    xdev->cman.num_rgb = 1 << xdev->vinfo->bits_per_rgb;
+
+#if HaveStdCMap
+    xdev->cman.std_cmap = NULL;
+    xdev->cman.free_std_cmap = false;
+#endif
+    xdev->cman.dither_ramp = NULL;
+    xdev->cman.dynamic.colors = NULL;
+    xdev->cman.dynamic.size = 0;
+    xdev->cman.dynamic.used = 0;
+    switch (xdev->vinfo->depth) {
+    case 1: case 2: case 4: case 8: case 16: case 24: case 32:
+	xdev->color_info.depth = xdev->vinfo->depth;
+	break;
+    case 15:
+	xdev->color_info.depth = 16;
+	break;
+    default:
+	eprintf1("Unsupported X visual depth: %d\n", xdev->vinfo->depth);
+	return_error(gs_error_rangecheck);
+    }
+    switch ((int)palette) {
+    case 'C':
+	xdev->color_info.num_components = 3;
+	xdev->color_info.max_gray =
+	    xdev->color_info.max_color = xdev->cman.num_rgb - 1;
+#if HaveStdCMap
+	/* Get a standard color map if available */
+	if (xdev->vinfo->visual == DefaultVisualOfScreen(xdev->scr)) {
+	    xdev->cman.std_cmap = x_get_std_cmap(xdev, XA_RGB_DEFAULT_MAP);
+	} else {
+	    xdev->cman.std_cmap = x_get_std_cmap(xdev, XA_RGB_BEST_MAP);
+	}
+	if (xdev->cman.std_cmap ||
+	    (xdev->vinfo->class == TrueColor && alloc_std_cmap(xdev, true))
+	    ) {
+	    xdev->color_info.dither_grays = xdev->color_info.dither_colors =
+		min(xdev->cman.std_cmap->red_max,
+		    min(xdev->cman.std_cmap->green_max,
+			xdev->cman.std_cmap->blue_max)) + 1;
+	} else
+#endif
+	    /* Otherwise set up a rgb cube of our own */
+	    /* The color cube is limited to about 1/2 of the available */
+	    /* colormap, the user specified maxRGBRamp (usually 5), */
+	    /* or the number of representable colors */
+#define CUBE(r) (r*r*r)
+#define CBRT(r) pow(r, 1.0/3.0)
+	{
+	    int ramp_size =
+		min((int)CBRT(xdev->vinfo->colormap_size / 2.0),
+		    min(xdev->maxRGBRamp, xdev->cman.num_rgb));
+
+	    while (!xdev->cman.dither_ramp && ramp_size >= 2) {
+		xdev->color_info.dither_grays =
+		    xdev->color_info.dither_colors = ramp_size;
+		if (!setup_cube(xdev, ramp_size, true)) {
+#ifdef DEBUG
+		    eprintf3("Warning: failed to allocate %dx%dx%d RGB cube.\n",
+			     ramp_size, ramp_size, ramp_size);
+#endif
+		    ramp_size--;
+		    continue;
+		}
+	    }
+
+	    if (!xdev->cman.dither_ramp) {
+		goto grayscale;
+	    }
+	}
+
+	/* Allocate the dynamic color table. */
+	alloc_dynamic_colors(xdev, CUBE(xdev->cman.num_rgb) -
+			     CUBE(xdev->color_info.dither_colors));
+#undef CUBE
+#undef CBRT
+	break;
+    case 'G':
+grayscale:
+	xdev->color_info.num_components = 1;
+	xdev->color_info.max_gray = xdev->cman.num_rgb - 1;
+#if HaveStdCMap
+	/* Get a standard color map if available */
+	xdev->cman.std_cmap = x_get_std_cmap(xdev, XA_RGB_GRAY_MAP);
+	if (xdev->cman.std_cmap ||
+	    (xdev->vinfo->class == StaticGray && alloc_std_cmap(xdev, false))
+	    ) {
+	    xdev->color_info.dither_grays = xdev->cman.std_cmap->red_max + 1;
+	} else
+#endif
+	    /* Otherwise set up a gray ramp of our own */
+	    /* The gray ramp is limited to about 1/2 of the available */
+	    /* colormap, the user specified maxGrayRamp (usually 128), */
+	    /* or the number of representable grays */
+	{
+	    int ramp_size = min(xdev->vinfo->colormap_size / 2,
+				min(xdev->maxGrayRamp, xdev->cman.num_rgb));
+
+	    while (!xdev->cman.dither_ramp && ramp_size >= 3) {
+		xdev->color_info.dither_grays = ramp_size;
+		if (!setup_cube(xdev, ramp_size, false)) {
+#ifdef DEBUG
+		    eprintf1("Warning: failed to allocate %d level gray ramp.\n",
+			     ramp_size);
+#endif
+		    ramp_size /= 2;
+		    continue;
+		}
+	    }
+	    if (!xdev->cman.dither_ramp) {
+		goto monochrome;
+	    }
+	}
+
+	/* Allocate the dynamic color table. */
+	alloc_dynamic_colors(xdev, xdev->cman.num_rgb -
+			     xdev->color_info.dither_grays);
+	break;
+    case 'M':
+monochrome:
+	xdev->color_info.num_components = 1;
+	xdev->color_info.max_gray = 1;
+	xdev->color_info.dither_grays = 2;
+	break;
+    default:
+	eprintf1("Unknown palette: %s\n", xdev->palette);
+	return_error(gs_error_rangecheck);
+    }
+    {	/* Set up the reverse map from pixel values to RGB. */
+	int count = 1 << min(xdev->color_info.depth, 8);
+
+	xdev->cman.color_to_rgb.values =
+	    (x11_rgb_t *)gs_malloc(sizeof(x11_rgb_t), count,
+				   "gdevx color_to_rgb");
+	if (xdev->cman.color_to_rgb.values) {
+	    int i;
+
+	    for (i = 0; i < count; ++i)
+		xdev->cman.color_to_rgb.values[i].defined = false;
+	    xdev->cman.color_to_rgb.size = count;
+	} else
+	    xdev->cman.color_to_rgb.size = 0;
+    }
+    return 0;
+}
+
+/* Free the dynamic colors when doing an erasepage. */
+/* Uses: cman.dynamic.*.  Sets: cman.dynamic.used. */
+void
+gdev_x_free_dynamic_colors(gx_device_X *xdev)
+{
+    if (xdev->cman.dynamic.colors) {
+	int i;
+	x11_color_t *xcp;
+	x11_color_t *next;
+
+	for (i = 0; i < xdev->cman.dynamic.size; i++) {
+	    for (xcp = xdev->cman.dynamic.colors[i]; xcp; xcp = next) {
+		next = xcp->next;
+		if (xcp->color.pad)
+		    x_free_colors(xdev, &xcp->color.pixel, 1);
+		gs_x_free(xcp, "x11_dynamic_color");
+	    }
+	    xdev->cman.dynamic.colors[i] = NULL;
+	}
+	xdev->cman.dynamic.used = 0;
+    }
+}
+
+/* Free storage and color map entries when closing the device. */
+/* Uses and sets: cman.{std_cmap, dither_ramp, dynamic.colors, color_to_rgb.*}. */
+/* Uses: cman.free_std_cmap. */
+void
+gdev_x_free_colors(gx_device_X *xdev)
+{
+    if (xdev->cman.free_std_cmap) {
+	/* XFree is declared as taking a char *, not a void *! */
+	XFree((void *)xdev->cman.std_cmap);
+	xdev->cman.free_std_cmap = false;
+    }
+    xdev->cman.std_cmap = 0;
+    if (xdev->cman.dither_ramp)
+	gs_x_free(xdev->cman.dither_ramp, "x11 dither_colors");
+    if (xdev->cman.dynamic.colors) {
+	gdev_x_free_dynamic_colors(xdev);
+	gs_x_free(xdev->cman.dynamic.colors, "x11 cman.dynamic.colors");
+	xdev->cman.dynamic.colors = NULL;
+    }
+    if (xdev->cman.color_to_rgb.values) {
+	gs_x_free(xdev->cman.color_to_rgb.values, "x11 color_to_rgb");
+	xdev->cman.color_to_rgb.values = NULL;
+	xdev->cman.color_to_rgb.size = 0;
+    }
+}
+
+/* ---------------- Driver color mapping calls ---------------- */
+
+/* Define a table for computing N * X_max_color_value / D for 0 <= N <= D, */
+/* 1 <= D <= 7. */
+/* This requires a multiply and a divide otherwise; */
+/* integer multiply and divide are slow on all platforms. */
+#define CV_FRACTION(n, d) ((X_color_value)(X_max_color_value * (n) / (d)))
+#define ND(n, d) CV_FRACTION(n, d)
+private const X_color_value cv_tab1[] = {
+    ND(0,1), ND(1,1)
+};
+private const X_color_value cv_tab2[] = {
+    ND(0,2), ND(1,2), ND(2,2)
+};
+private const X_color_value cv_tab3[] = {
+    ND(0,3), ND(1,3), ND(2,3), ND(3,3)
+};
+private const X_color_value cv_tab4[] = {
+    ND(0,4), ND(1,4), ND(2,4), ND(3,4), ND(4,4)
+};
+private const X_color_value cv_tab5[] = {
+    ND(0,5), ND(1,5), ND(2,5), ND(3,5), ND(4,5), ND(5,5)
+};
+private const X_color_value cv_tab6[] = {
+    ND(0,6), ND(1,6), ND(2,6), ND(3,6), ND(4,6), ND(5,6), ND(6,6)
+};
+private const X_color_value cv_tab7[] = {
+    ND(0,7), ND(1,7), ND(2,7), ND(3,7), ND(4,7), ND(5,7), ND(6,7), ND(7,7)
+};
+#undef ND
+private const X_color_value *const cv_tables[] =
+{
+    0, cv_tab1, cv_tab2, cv_tab3, cv_tab4, cv_tab5, cv_tab6, cv_tab7
+};
+
+/* Some C compilers don't declare the abs function in math.h. */
+/* Provide one of our own. */
+private inline int
+iabs(int x)
+{
+    return (x < 0 ? -x : x);
+}
+
+/* Map RGB values to a pixel value. */
+gx_color_index
+gdev_x_map_rgb_color(gx_device * dev,
+		     gx_color_value r, gx_color_value g, gx_color_value b)
+{
+    gx_device_X *const xdev = (gx_device_X *) dev;
+
+    /* X and ghostscript both use shorts for color values */
+    X_color_value dr = r & xdev->cman.color_mask.red;  /* Nearest color that */
+    X_color_value dg = g & xdev->cman.color_mask.green;/* the X device can   */
+    X_color_value db = b & xdev->cman.color_mask.blue; /* represent          */
+
+    /* Foreground and background get special treatment: */
+    /* They may be mapped to other colors. */
+    if ((dr | dg | db) == 0) {	/* i.e., all 0 */
+	if_debug4('C', "[cX]%u,%u,%u => foreground = %lu\n",
+		  r, g, b, (ulong) xdev->foreground);
+	return xdev->foreground;
+    }
+    if (dr == xdev->cman.color_mask.red &&
+	dg == xdev->cman.color_mask.green &&
+	db == xdev->cman.color_mask.blue
+	) {
+	if_debug4('C', "[cX]%u,%u,%u => background = %lu\n",
+		  r, g, b, (ulong) xdev->background);
+	return xdev->background;
+    }
+
+#define CV_DENOM (gx_max_color_value + 1)
+
+#if HaveStdCMap
+    /* check the standard colormap first */
+    if (xdev->cman.std_cmap) {
+	const XStandardColormap *cmap = xdev->cman.std_cmap;
+
+	if (gx_device_has_color(xdev)) {
+	    uint cr, cg, cb;	/* rgb cube indices */
+	    X_color_value cvr, cvg, cvb;	/* color value on cube */
+
+	    cr = r * (cmap->red_max + 1) / CV_DENOM;
+	    cg = g * (cmap->green_max + 1) / CV_DENOM;
+	    cb = b * (cmap->blue_max + 1) / CV_DENOM;
+	    cvr = X_max_color_value * cr / cmap->red_max;
+	    cvg = X_max_color_value * cg / cmap->green_max;
+	    cvb = X_max_color_value * cb / cmap->blue_max;
+	    if ((iabs((int)r - (int)cvr) & xdev->cman.color_mask.red) == 0 &&
+		(iabs((int)g - (int)cvg) & xdev->cman.color_mask.green) == 0 &&
+		(iabs((int)b - (int)cvb) & xdev->cman.color_mask.blue) == 0) {
+		gx_color_index pixel =
+		    cr * cmap->red_mult + cg * cmap->green_mult +
+		    cb * cmap->blue_mult + cmap->base_pixel;
+
+		if_debug4('C', "[cX]%u,%u,%u (std cmap) => %lu\n",
+			  r, g, b, pixel);
+		return pixel;
+	    }
+	    if_debug3('C', "[cX]%u,%u,%u (std cmap fails)\n", r, g, b);
+	} else {
+	    uint cr;
+	    X_color_value cvr;
+
+	    cr = r * (cmap->red_max + 1) / CV_DENOM;
+	    cvr = X_max_color_value * cr / cmap->red_max;
+	    if ((iabs((int)r - (int)cvr) & xdev->cman.color_mask.red) == 0) {
+		gx_color_index pixel = cr * cmap->red_mult + cmap->base_pixel;
+
+		if_debug2('C', "[cX]%u (std cmap) => %lu\n", r, pixel);
+		return pixel;
+	    }
+	    if_debug1('C', "[cX]%u (std cmap fails)\n", r);
+	}
+    } else
+#endif
+
+	/* If there is no standard colormap, check the dither cube/ramp */
+    if (xdev->cman.dither_ramp) {
+	if (gx_device_has_color(xdev)) {
+	    uint cr, cg, cb;	/* rgb cube indices */
+	    X_color_value cvr, cvg, cvb;	/* color value on cube */
+	    int dither_rgb = xdev->color_info.dither_colors;
+	    uint max_rgb = dither_rgb - 1;
+
+	    cr = r * dither_rgb / CV_DENOM;
+	    cg = g * dither_rgb / CV_DENOM;
+	    cb = b * dither_rgb / CV_DENOM;
+	    if (max_rgb < countof(cv_tables)) {
+		const ushort *cv_tab = cv_tables[max_rgb];
+
+		cvr = cv_tab[cr];
+		cvg = cv_tab[cg];
+		cvb = cv_tab[cb];
+	    } else {
+		cvr = CV_FRACTION(cr, max_rgb);
+		cvg = CV_FRACTION(cg, max_rgb);
+		cvb = CV_FRACTION(cb, max_rgb);
+	    }
+	    if ((iabs((int)r - (int)cvr) & xdev->cman.color_mask.red) == 0 &&
+		(iabs((int)g - (int)cvg) & xdev->cman.color_mask.green) == 0 &&
+		(iabs((int)b - (int)cvb) & xdev->cman.color_mask.blue) == 0) {
+		gx_color_index pixel =
+		    xdev->cman.dither_ramp[CUBE_INDEX(cr, cg, cb)];
+
+		if_debug4('C', "[cX]%u,%u,%u (dither cube) => %lu\n",
+			  r, g, b, pixel);
+		return pixel;
+	    }
+	    if_debug3('C', "[cX]%u,%u,%u (dither cube fails)\n", r, g, b);
+	} else {
+	    uint cr;
+	    X_color_value cvr;
+	    int dither_grays = xdev->color_info.dither_grays;
+	    uint max_gray = dither_grays - 1;
+
+	    cr = r * dither_grays / CV_DENOM;
+	    cvr = (X_max_color_value * cr / max_gray);
+	    if ((iabs((int)r - (int)cvr) & xdev->cman.color_mask.red) == 0) {
+		gx_color_index pixel = xdev->cman.dither_ramp[cr];
+
+		if_debug2('C', "[cX]%u (dither ramp) => %lu\n", r, pixel);
+		return pixel;
+	    }
+	    if_debug1('C', "[cX]%u (dither ramp fails)\n", r);
+	}
+    }
+
+    /* Finally look through the list of dynamic colors */
+    if (xdev->cman.dynamic.colors) {
+	int i = (dr ^ dg ^ db) >> xdev->cman.dynamic.shift;
+	x11_color_t *xcp = xdev->cman.dynamic.colors[i];
+	x11_color_t *prev = NULL;
+	XColor xc;
+
+	for (; xcp; prev = xcp, xcp = xcp->next)
+	    if (xcp->color.red == dr && xcp->color.green == dg &&
+		xcp->color.blue == db) {
+		/* Promote the found entry to the front of the list. */
+		if (prev) {
+		    prev->next = xcp->next;
+		    xcp->next = xdev->cman.dynamic.colors[i];
+		    xdev->cman.dynamic.colors[i] = xcp;
+		}
+		if (xcp->color.pad) {
+		    if_debug4('C', "[cX]%u,%u,%u (dynamic) => %lu\n",
+			      r, g, b, (ulong) xcp->color.pixel);
+		    return xcp->color.pixel;
+		} else {
+		    if_debug3('C', "[cX]%u,%u,%u (dynamic) => missing\n",
+			      r, g, b);
+		    return gx_no_color_index;
+		}
+	    }
+
+	/* If not in our list of dynamic colors, */
+	/* ask the X server and add an entry. */
+	/* First check if dynamic table is exhausted */
+	if (xdev->cman.dynamic.used > xdev->cman.dynamic.max_used) {
+	    if_debug3('C', "[cX]%u,%u,%u (dynamic) => full\n", r, g, b);
+	    return gx_no_color_index;
+	}
+	xcp = (x11_color_t *)
+	    gs_malloc(sizeof(x11_color_t), 1, "x11_dynamic_color");
+	if (!xcp)
+	    return gx_no_color_index;
+	xc.red = xcp->color.red = dr;
+	xc.green = xcp->color.green = dg;
+	xc.blue = xcp->color.blue = db;
+	xcp->next = xdev->cman.dynamic.colors[i];
+	xdev->cman.dynamic.colors[i] = xcp;
+	xdev->cman.dynamic.used++;
+	if (x_alloc_color(xdev, &xc)) {
+	    xcp->color.pixel = xc.pixel;
+	    xcp->color.pad = true;
+	    if_debug5('c', "[cX]0x%x,0x%x,0x%x (dynamic) => added [%d]%lu\n",
+		      dr, dg, db, xdev->cman.dynamic.used - 1,
+		      (ulong)xc.pixel);
+	    return xc.pixel;
+	} else {
+	    xcp->color.pad = false;
+	    if_debug3('c', "[cX]0x%x,0x%x,0x%x (dynamic) => can't alloc\n",
+		      dr, dg, db);
+	    return gx_no_color_index;
+	}
+    }
+    if_debug3('C', "[cX]%u,%u,%u fails\n", r, g, b);
+    return gx_no_color_index;
+#undef CV_DENOM
+}
+
+
+/* Map a pixel value back to r-g-b. */
+int
+gdev_x_map_color_rgb(gx_device * dev, gx_color_index color,
+		     gx_color_value prgb[3])
+{
+    const gx_device_X *const xdev = (const gx_device_X *) dev;
+#if HaveStdCMap
+    const XStandardColormap *cmap = xdev->cman.std_cmap;
+#endif
+
+    if (color == xdev->foreground) {
+	prgb[0] = prgb[1] = prgb[2] = 0;
+	return 0;
+    }
+    if (color == xdev->background) {
+	prgb[0] = prgb[1] = prgb[2] = gx_max_color_value;
+	return 0;
+    }
+    if (color < xdev->cman.color_to_rgb.size) {
+	const x11_rgb_t *pxrgb = &xdev->cman.color_to_rgb.values[color];
+
+	if (pxrgb->defined) {
+	    prgb[0] = pxrgb->rgb[0];
+	    prgb[1] = pxrgb->rgb[1];
+	    prgb[2] = pxrgb->rgb[2];
+	    return 0;
+	}
+#if HaveStdCMap
+    }
+
+    /* Check the standard colormap. */
+    if (cmap) {
+	if (color >= cmap->base_pixel) {
+	    x_pixel value = color - cmap->base_pixel;
+	    uint r = (value / cmap->red_mult) % (cmap->red_max + 1);
+	    uint g = (value / cmap->green_mult) % (cmap->green_max + 1);
+	    uint b = (value / cmap->blue_mult) % (cmap->blue_max + 1);
+
+	    if (value == r * cmap->red_mult + g * cmap->green_mult +
+		b * cmap->blue_mult) {
+		/* When mapping color buckets back to specific colors,
+		 * we can choose to map them to the darkest shades
+		 * (e.g., 0, 1/3, 2/3), to the lightest shades (e.g.,
+		 * 1/3-epsilon, 2/3-epsilon, 1-epsilon), to the middle
+		 * shades (e.g., 1/6, 1/2, 5/6), or for maximum contrast
+		 * (e.g., 0, 1/2, 1).  The last of these matches the
+		 * assumptions of the halftoning code, so that is what
+		 * we choose.
+		 */
+		prgb[0] = r * gx_max_color_value / cmap->red_max;
+		prgb[1] = g * gx_max_color_value / cmap->green_max;
+		prgb[2] = b * gx_max_color_value / cmap->blue_max;
+		return 0;
+	    }
+	}
+    }
+    if (color < xdev->cman.color_to_rgb.size) {
+#endif
+	/* Error -- undefined pixel value. */
+	return_error(gs_error_unknownerror);
+    }
+    /*
+     * Check the dither cube/ramp.  This is hardly ever used, since if
+     * there are few enough colors to require dithering, the pixel values
+     * are likely to be small enough to index color_to_rgb.
+     */
+    if (xdev->cman.dither_ramp) {
+	if (gx_device_has_color(xdev)) {
+	    int size = xdev->color_info.dither_colors;
+	    int size3 = size * size * size;
+	    int i;
+
+	    for (i = 0; i < size3; ++i)
+		if (xdev->cman.dither_ramp[i] == color) {
+		    uint max_rgb = size - 1;
+		    uint q = i / size,
+			r = q / size,
+			g = q % size,
+			b = i % size;
+
+		    /*
+		     * See above regarding the choice of color mapping
+		     * algorithm.
+		     */
+		    prgb[0] = r * gx_max_color_value / max_rgb;
+		    prgb[1] = g * gx_max_color_value / max_rgb;
+		    prgb[2] = b * gx_max_color_value / max_rgb;
+		    return 0;
+		}
+	} else {
+	    int size = xdev->color_info.dither_grays;
+	    int i;
+
+	    for (i = 0; i < size; ++i)
+		if (xdev->cman.dither_ramp[i] == color) {
+		    prgb[0] = prgb[1] = prgb[2] =
+			i * gx_max_color_value / (size - 1);
+		    return 0;
+		}
+	}
+    }
+
+    /* Finally, search the list of dynamic colors. */
+    if (xdev->cman.dynamic.colors) {
+	int i;
+	const x11_color_t *xcp;
+
+	for (i = xdev->cman.dynamic.size; --i >= 0;)
+	    for (xcp = xdev->cman.dynamic.colors[i]; xcp; xcp = xcp->next)
+		if (xcp->color.pixel == color && xcp->color.pad) {
+		    prgb[0] = xcp->color.red;
+		    prgb[1] = xcp->color.green;
+		    prgb[2] = xcp->color.blue;
+		    return 0;
+		}
+    }
+
+    /* Not found -- not possible! */
+    return_error(gs_error_unknownerror);
+}