M_IMGDATA->m_alpha[y*w + x] = alpha;
}
-unsigned char wxImage::GetAlpha(int x, int y)
+unsigned char wxImage::GetAlpha(int x, int y) const
{
wxCHECK_MSG( Ok() && HasAlpha(), 0, wxT("invalid image or no alpha channel") );
alpha = (unsigned char *)malloc(M_IMGDATA->m_width*M_IMGDATA->m_height);
}
- delete [] M_IMGDATA->m_alpha;
+ free(M_IMGDATA->m_alpha);
M_IMGDATA->m_alpha = alpha;
}
// check that the images are the same size
if ( (M_IMGDATA->m_height != mask.GetHeight() ) || (M_IMGDATA->m_width != mask.GetWidth () ) )
{
- wxLogError( _("Image and Mask have different sizes") );
+ wxLogError( _("Image and mask have different sizes.") );
return false;
}
unsigned char r,g,b ;
if (!FindFirstUnusedColour(&r, &g, &b))
{
- wxLogError( _("No Unused Color in image being masked") );
+ wxLogError( _("No unused colour in image being masked.") );
return false ;
}
return true;
}
+
+bool wxImage::ConvertAlphaToMask(unsigned char threshold)
+{
+ if (!HasAlpha())
+ return true;
+
+ unsigned char mr, mg, mb;
+ if (!FindFirstUnusedColour(&mr, &mg, &mb))
+ {
+ wxLogError( _("No unused colour in image being masked.") );
+ return false;
+ }
+
+ SetMask(true);
+ SetMaskColour(mr, mg, mb);
+
+ unsigned char *imgdata = GetData();
+ unsigned char *alphadata = GetAlpha();
+
+ int w = GetWidth();
+ int h = GetHeight();
+
+ for (int y = 0; y < h; y++)
+ {
+ for (int x = 0; x < w; x++, imgdata += 3, alphadata++)
+ {
+ if (*alphadata < threshold)
+ {
+ imgdata[0] = mr;
+ imgdata[1] = mg;
+ imgdata[2] = mb;
+ }
+ }
+ }
+
+ free(M_IMGDATA->m_alpha);
+ M_IMGDATA->m_alpha = NULL;
+
+ return true;
+}
#if wxUSE_PALETTE
b2++;
if ( b2 >= 255 )
{
- wxLogError(_("GetUnusedColour:: No Unused Color in image ") );
+ wxLogError(_("No unused colour in image.") );
return false;
}
}