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/* This file contains device-specific color database access routines.
These routines are called by various CGMPlotter methods, before drawing
objects.
The CGM output file will use either 24-bit RGB or 48-bit RGB, depending
on the value of CGM_BINARY_BYTES_PER_COLOR_COMPONENT (set in extern.h;
1 or 2, respectively). This code assumes that the value is 1 or 2, even
though CGM files allow 3 or 4 as well. To handle the `4' case, we
should rewrite this to use unsigned ints rather than signed ints.
The reason we don't bother with 3 or 4 is that internally, libplot uses
48-bit color. So 48-bit RGB in the CGM output file is all we need. */
#include "sys-defines.h"
#include "extern.h"
void
#ifdef _HAVE_PROTOS
_c_set_pen_color(R___(Plotter *_plotter) int cgm_object_type)
#else
_c_set_pen_color(R___(_plotter) cgm_object_type)
S___(Plotter *_plotter;)
int cgm_object_type;
#endif
{
int red_long, green_long, blue_long;
int red, green, blue;
int byte_count, data_byte_count, data_len;
int fullstrength;
if (_plotter->drawstate->pen_type == 0
&& cgm_object_type != CGM_OBJECT_TEXT)
/* don't do anything, pen color will be ignored when writing objects */
return;
/* 48-bit RGB */
red_long = _plotter->drawstate->fgcolor.red;
green_long = _plotter->drawstate->fgcolor.green;
blue_long = _plotter->drawstate->fgcolor.blue;
/* 24-bit or 48-bit RGB (as used in CGMs) */
switch (CGM_BINARY_BYTES_PER_COLOR_COMPONENT)
{
case 1:
/* 24-bit */
red = (((unsigned int)red_long) >> 8) & 0xff;
green = (((unsigned int)green_long) >> 8) & 0xff;
blue = (((unsigned int)blue_long) >> 8) & 0xff;
break;
case 2:
default:
/* 48-bit */
red = red_long;
green = green_long;
blue = blue_long;
break;
}
fullstrength = (1 << (8 * CGM_BINARY_BYTES_PER_COLOR_COMPONENT)) - 1;
if ((red != 0 || green != 0 || blue != 0)
&& (red != fullstrength || green != fullstrength || blue != fullstrength))
_plotter->cgm_page_need_color = true;
switch (cgm_object_type)
{
case CGM_OBJECT_OPEN:
if (_plotter->cgm_line_color.red != red
|| _plotter->cgm_line_color.green != green
|| _plotter->cgm_line_color.blue != blue)
/* emit "LINE_COLOR" command */
{
data_len = 3 * CGM_BINARY_BYTES_PER_COLOR_COMPONENT;
byte_count = data_byte_count = 0;
_cgm_emit_command_header (_plotter->data->page, _plotter->cgm_encoding,
CGM_ATTRIBUTE_ELEMENT, 4,
data_len, &byte_count,
"LINECOLR");
_cgm_emit_color_component (_plotter->data->page, false, _plotter->cgm_encoding,
(unsigned int)red,
data_len, &data_byte_count, &byte_count);
_cgm_emit_color_component (_plotter->data->page, false, _plotter->cgm_encoding,
(unsigned int)green,
data_len, &data_byte_count, &byte_count);
_cgm_emit_color_component (_plotter->data->page, false, _plotter->cgm_encoding,
(unsigned int)blue,
data_len, &data_byte_count, &byte_count);
_cgm_emit_command_terminator (_plotter->data->page, _plotter->cgm_encoding,
&byte_count);
/* update our knowledge of CGM's pen color */
_plotter->cgm_line_color.red = red;
_plotter->cgm_line_color.green = green;
_plotter->cgm_line_color.blue = blue;
}
break;
case CGM_OBJECT_CLOSED:
if (_plotter->cgm_edge_color.red != red
|| _plotter->cgm_edge_color.green != green
|| _plotter->cgm_edge_color.blue != blue)
/* emit "EDGE_COLOR" command */
{
data_len = 3 * CGM_BINARY_BYTES_PER_COLOR_COMPONENT;
byte_count = data_byte_count = 0;
_cgm_emit_command_header (_plotter->data->page, _plotter->cgm_encoding,
CGM_ATTRIBUTE_ELEMENT, 29,
data_len, &byte_count,
"EDGECOLR");
_cgm_emit_color_component (_plotter->data->page, false, _plotter->cgm_encoding,
(unsigned int)red,
data_len, &data_byte_count, &byte_count);
_cgm_emit_color_component (_plotter->data->page, false, _plotter->cgm_encoding,
(unsigned int)green,
data_len, &data_byte_count, &byte_count);
_cgm_emit_color_component (_plotter->data->page, false, _plotter->cgm_encoding,
(unsigned int)blue,
data_len, &data_byte_count, &byte_count);
_cgm_emit_command_terminator (_plotter->data->page, _plotter->cgm_encoding,
&byte_count);
/* update our knowledge of CGM's edge color */
_plotter->cgm_edge_color.red = red;
_plotter->cgm_edge_color.green = green;
_plotter->cgm_edge_color.blue = blue;
}
break;
case CGM_OBJECT_MARKER:
if (_plotter->cgm_marker_color.red != red
|| _plotter->cgm_marker_color.green != green
|| _plotter->cgm_marker_color.blue != blue)
/* emit "MARKER COLOR" command */
{
data_len = 3 * CGM_BINARY_BYTES_PER_COLOR_COMPONENT;
byte_count = data_byte_count = 0;
_cgm_emit_command_header (_plotter->data->page, _plotter->cgm_encoding,
CGM_ATTRIBUTE_ELEMENT, 8,
data_len, &byte_count,
"MARKERCOLR");
_cgm_emit_color_component (_plotter->data->page, false, _plotter->cgm_encoding,
(unsigned int)red,
data_len, &data_byte_count, &byte_count);
_cgm_emit_color_component (_plotter->data->page, false, _plotter->cgm_encoding,
(unsigned int)green,
data_len, &data_byte_count, &byte_count);
_cgm_emit_color_component (_plotter->data->page, false, _plotter->cgm_encoding,
(unsigned int)blue,
data_len, &data_byte_count, &byte_count);
_cgm_emit_command_terminator (_plotter->data->page, _plotter->cgm_encoding,
&byte_count);
/* update our knowledge of CGM's marker color */
_plotter->cgm_marker_color.red = red;
_plotter->cgm_marker_color.green = green;
_plotter->cgm_marker_color.blue = blue;
}
break;
case CGM_OBJECT_TEXT:
if (_plotter->cgm_text_color.red != red
|| _plotter->cgm_text_color.green != green
|| _plotter->cgm_text_color.blue != blue)
/* emit "TEXT COLOR" command */
{
data_len = 3 * CGM_BINARY_BYTES_PER_COLOR_COMPONENT;
byte_count = data_byte_count = 0;
_cgm_emit_command_header (_plotter->data->page, _plotter->cgm_encoding,
CGM_ATTRIBUTE_ELEMENT, 14,
data_len, &byte_count,
"TEXTCOLR");
_cgm_emit_color_component (_plotter->data->page, false, _plotter->cgm_encoding,
(unsigned int)red,
data_len, &data_byte_count, &byte_count);
_cgm_emit_color_component (_plotter->data->page, false, _plotter->cgm_encoding,
(unsigned int)green,
data_len, &data_byte_count, &byte_count);
_cgm_emit_color_component (_plotter->data->page, false, _plotter->cgm_encoding,
(unsigned int)blue,
data_len, &data_byte_count, &byte_count);
_cgm_emit_command_terminator (_plotter->data->page, _plotter->cgm_encoding,
&byte_count);
/* update our knowledge of CGM's text color */
_plotter->cgm_text_color.red = red;
_plotter->cgm_text_color.green = green;
_plotter->cgm_text_color.blue = blue;
}
break;
default:
break;
}
}
void
#ifdef _HAVE_PROTOS
_c_set_fill_color(R___(Plotter *_plotter) int cgm_object_type)
#else
_c_set_fill_color(R___(_plotter) cgm_object_type)
S___(Plotter *_plotter;)
int cgm_object_type;
#endif
{
int red_long, green_long, blue_long;
int red, green, blue;
int fullstrength;
int byte_count, data_byte_count, data_len;
if (_plotter->drawstate->fill_type == 0)
/* don't do anything, fill color will be ignored when writing objects */
return;
if (cgm_object_type != CGM_OBJECT_OPEN
&& cgm_object_type != CGM_OBJECT_CLOSED)
/* don't do anything; won't be filling */
return;
/* obtain each RGB as a 16-bit quantity (48 bits in all) */
red_long = _plotter->drawstate->fillcolor.red;
green_long = _plotter->drawstate->fillcolor.green;
blue_long = _plotter->drawstate->fillcolor.blue;
/* 24-bit or 48-bit RGB (as used in CGMs) */
switch (CGM_BINARY_BYTES_PER_COLOR_COMPONENT)
{
case 1:
/* 24-bit */
red = (((unsigned int)red_long) >> 8) & 0xff;
green = (((unsigned int)green_long) >> 8) & 0xff;
blue = (((unsigned int)blue_long) >> 8) & 0xff;
break;
case 2:
default:
/* 48-bit */
red = red_long;
green = green_long;
blue = blue_long;
break;
}
fullstrength = (1 << (8 * CGM_BINARY_BYTES_PER_COLOR_COMPONENT)) - 1;
if ((red != 0 || green != 0 || blue != 0)
&& (red != fullstrength || green != fullstrength || blue != fullstrength))
_plotter->cgm_page_need_color = true;
if (_plotter->cgm_fillcolor.red != red
|| _plotter->cgm_fillcolor.green != green
|| _plotter->cgm_fillcolor.blue != blue)
/* emit "FILL COLOR" command */
{
data_len = 3 * CGM_BINARY_BYTES_PER_COLOR_COMPONENT;
byte_count = data_byte_count = 0;
_cgm_emit_command_header (_plotter->data->page, _plotter->cgm_encoding,
CGM_ATTRIBUTE_ELEMENT, 23,
data_len, &byte_count,
"FILLCOLR");
_cgm_emit_color_component (_plotter->data->page, false, _plotter->cgm_encoding,
(unsigned int)red,
data_len, &data_byte_count, &byte_count);
_cgm_emit_color_component (_plotter->data->page, false, _plotter->cgm_encoding,
(unsigned int)green,
data_len, &data_byte_count, &byte_count);
_cgm_emit_color_component (_plotter->data->page, false, _plotter->cgm_encoding,
(unsigned int)blue,
data_len, &data_byte_count, &byte_count);
_cgm_emit_command_terminator (_plotter->data->page, _plotter->cgm_encoding,
&byte_count);
/* update our knowledge of CGM's fill color */
_plotter->cgm_fillcolor.red = red;
_plotter->cgm_fillcolor.green = green;
_plotter->cgm_fillcolor.blue = blue;
}
}
void
#ifdef _HAVE_PROTOS
_c_set_bg_color(S___(Plotter *_plotter))
#else
_c_set_bg_color(S___(_plotter))
S___(Plotter *_plotter;)
#endif
{
int red_long, green_long, blue_long;
int red, green, blue;
/* 48-bit RGB */
red_long = _plotter->drawstate->bgcolor.red;
green_long = _plotter->drawstate->bgcolor.green;
blue_long = _plotter->drawstate->bgcolor.blue;
/* 24-bit or 48-bit RGB (as used in CGMs) */
switch (CGM_BINARY_BYTES_PER_COLOR_COMPONENT)
{
case 1:
/* 24-bit */
red = (((unsigned int)red_long) >> 8) & 0xff;
green = (((unsigned int)green_long) >> 8) & 0xff;
blue = (((unsigned int)blue_long) >> 8) & 0xff;
break;
case 2:
default:
/* 48-bit */
red = red_long;
green = green_long;
blue = blue_long;
break;
}
/* update our knowledge of what CGM's background color should be (we'll
use it only when we write the picture header) */
_plotter->cgm_bgcolor.red = red;
_plotter->cgm_bgcolor.green = green;
_plotter->cgm_bgcolor.blue = blue;
/* should the just-computed color be ignored, i.e., did the user really
specify "none" as the background color? */
_plotter->cgm_bgcolor_suppressed = _plotter->drawstate->bgcolor_suppressed;
}
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