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y_dither_table = Yp % 2; /* Y Pixel Address MOD 2 */

/* Start with the initial values as supplied by the calling routine */

red = RedValue;

green = GreenValue;

blue = BlueValue;

/* Generate the red dither value */

if (red >= 48) /* 48 is a constant required by this routine */

red=red-16;

else

red=red/2+8;

red += dither_red[y_dither_table][x_dither_table];

/* Check for overflow or underflow on red value */

if (red > 0xff) red = 0xff;

if (red < 0x00) red = 0x00;

/* Generate the green dither value */

if (green >= 48) /* 48 is a constant required by this routine */

green=green-16;

else

green=green/2+8;

green += dither_green[y_dither_table][x_dither_table];

/* Check for overflow or underflow on green value */

if (green > 0xff) green = 0xff;

if (green < 0x00) green = 0x00;

/* Generate the blue dither value */

if (blue >= 112) /* 112 is a constant required by this routine */

blue=blue-32;

else

blue=blue/2+24;

blue += (dither_blue[y_dither_table][x_dither_table]<<1);

/* Check for overflow or underflow on blue value */

if (blue > 0xff) blue = 0xff;

if (blue < 0x00) blue = 0x00;

pixel = ((red & 0xE0) | ((green & 0xE0) >> 3) | ((blue & 0xC0) >> 6));

return(pixel);

}

Graphics Administration Guide for HP-UX 10.20

Page 66

HP b2600 Administration Guide

Other manuals for HP b2600