// specialization for type conversion
void copyBuf (byte *pTo, const RGB_TRIPLE *const pFrom, int width1, int height1)
{
for (int iy = 0; iy < height1; iy++)
for (int ix = 0; ix < width1; ix++)
{
RGB_TRIPLE Pix = pFrom[ix + ((height1 - 1 - iy) * width1)];
pTo[ix + iy * width1] = RgbToGray(Pix);
}
}
VOID
ps_setrgbcolor(
PDEVDATA pdev,
PSRGB *prgb
)
/*++
Routine Description:
Select a new color into the current graphics state
Arguments:
pdev - Points to our DEVDATA structure
prgb - Specifies the new color to be selected
Return Value:
NONE
--*/
{
if (pdev->dm.dmPrivate.dwFlags & PSDEVMODE_BLACK) {
// If monochrome flag is set, map all non-white colors to black
if (*((ULONG *) prgb) == RGB_WHITE)
psputs(pdev, "1 g\n");
else
psputs(pdev, "0 g\n");
} else if (pdev->cgs.ulColor != *((ULONG *) prgb)) {
PS_FIX psfxRed, psfxGreen, psfxBlue;
// Save the new color in the current graphics state structure.
pdev->cgs.ulColor = *((ULONG *) prgb);
// Convert RGB values from integers in the range of 0-255
// to 24.8 fixed-point values:
// fixValue = (rgbValue << 8) / 255
//
// Here, we use a simpler formula here to achieve similar results.
psfxRed = prgb->red;
if (psfxRed > 128) psfxRed++;
psfxGreen = prgb->green;
if (psfxGreen > 128) psfxGreen++;
psfxBlue = prgb->blue;
if (psfxBlue > 128) psfxBlue++;
if (pdev->dm.dmPublic.dmColor == DMCOLOR_COLOR) {
// If all color components have equal value, just output a
// gray scale value. Otherwise, output the RGB value.
if (psfxRed == psfxGreen && psfxRed == psfxBlue) {
psprintf(pdev, "%f g\n", psfxRed);
} else {
psprintf(pdev, "%f %f %f r\n", psfxRed, psfxGreen, psfxBlue);
}
} else {
// Convert RGB color to grayscale using NTSC formula
// and output the grayscale value to the printer.
psprintf(pdev, "%f g\n", RgbToGray(psfxRed, psfxGreen, psfxBlue));
}
}
}
