On Wed, Apr 16, 2008 at 12:40 PM, Aniello Del Sorbo <[EMAIL PROTECTED]> wrote:
> > Anyway.. the first issue below happened because I was running Xournal from > root in an SSH remote shell. > Thus, probably, colormaps were wrong. > Running it the usual way (from the Menu) fixed a bit things. > The GdkColor returned by the hildon color chooser was, when drawn on the > canvas, slightly different from the one showed in the button itself. > I think it looked darker. > > After digging a bit I figured out that the GdkColor RGB values where RGB16 > (guint16) while I needed the RGB8 format (for the "fill-color-rgba" > property). > Thus, I had to first divide red, green and blue by 255 before putting them > into a single guint value (RGBA) in the form of 0xRRGGBBAA. > > guint rgba = GNOME_CANVAS_COLOR_A (color->red / 255.0, color->green / > 255.0, color->blue / 255.0, alpha) > Further corrected, the divisor should not be 255 but 257 (0x101) instead. Otherwise the reduction from RGB16 to RGB8 does not work. RGB16 is in the form: 0xRRRRGGGGBBBB i.e. values range from 0 to 65535 RGB8 is in the form 0xRRGGBB i.e. values range from 0 to 255. Sorry if this is stuff people already know, but I am new to it and couldn't find much about it. -- anidel
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