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NxWidgets::CImage: Cannot use NxWidgets::CGraphicsPort:drawBitmapGreyScale() because it does not respect transparent or background colors in its current form. The end result is that makes the image background grey as well as the image

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This commit is contained in:
Gregory Nutt 2014-07-17 10:34:41 -06:00
parent 9067bb92f1
commit 1e6833d533
1 changed files with 29 additions and 12 deletions
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41
libnxwidgets/src/cimage.cxx
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@ -273,30 +273,47 @@ void CImage::drawContents(CGraphicsPort *port, bool selected)
return;
}
// Replace any transparent pixels with the background color.
// Then we can use the faster opaque drawBitmap() function.
// Pre-process special pixel values... Then we can use the faster
// opaque drawBitmap() function.
ptr = &buffer[m_origin.x];
for (int i = 0; i < nLeftPixels; i++, ptr++)
{
// Replace any transparent pixels with the background color.
if (*ptr == CONFIG_NXWIDGETS_TRANSPARENT_COLOR)
{
*ptr = backColor;
}
// Convert pixels (other than the background color) to grey
// scale if the image is disabled. We can't use
// CGraphicsPort::drawBitmapGreyColor because it does not
// (yet) understand transparent pixels and has no idea what it
// should do with background colors.
else if (*ptr != backColor && !isEnabled())
{
// Get the next RGB pixel and break out the individual
// components
nxwidget_pixel_t rgb = *ptr;
nxwidget_pixel_t r = RGB2RED(rgb);
nxwidget_pixel_t g = RGB2GREEN(rgb);
nxwidget_pixel_t b = RGB2BLUE(rgb);
// A truly accurate greyscale conversion would be complex.
// Let's just average.
nxwidget_pixel_t avg = (r + g + b) / 3;
*ptr = MKRGB(avg, avg, avg);
}
}
// And put these on the display
if (isEnabled())
{
port->drawBitmap(rect.getX(), destRow, rect.getWidth(), 1,
&bitmap, 0, 0);
}
else
{
port->drawBitmapGreyScale(rect.getX(), destRow,
rect.getWidth(), 1, &bitmap, 0, 0);
}
port->drawBitmap(rect.getX(), destRow, rect.getWidth(), 1,
&bitmap, 0, 0);
}
}