Hi Michael,
On 01.08.2012 13:24, Michael Meeks wrote:
I was at GUADEC just now, and trying to get toolbar rendering sorted
out for gtk3 - which turned out to be quite 'fun' ;-) it seems that the
toolbar items we have have a WB_BORDER style set which appears to create
a strange border rendering widget; which renders the entire toolbar
combo-box (eg. the font selector) twice at least. Quite apart from the
wastefulness there, with the new alpha transparent borders - we get a
double compositing which over-darkens the pretty alpha effects there :-)
With gtk3 I see similar effect for normal (not toolbar) buttons, edits
etc. Why do you think this is related to toolbars?
I solved the problem by the following change in renderAreaToPix:
cairo_data[x*4+0] * alpha
@@ -972,9 +972,9 @@ void GtkSalGraphics::renderAreaToPix( cairo_t *cr,
for (int x = 0; x < awidth && y < aheight; ++x)
{
double alpha = ((float)cairo_data[x*4 + 3])/255.0;
- src[x*3 + 0] = src[x*3 + 0] * (1.0 - alpha) +
cairo_data[x*4+0] * alpha;
- src[x*3 + 1] = src[x*3 + 1] * (1.0 - alpha) +
cairo_data[x*4+1] * alpha;
- src[x*3 + 2] = src[x*3 + 2] * (1.0 - alpha) +
cairo_data[x*4+2] * alpha;
+ src[x*3 + 0] = src[x*3 + 0] * (1.0 - alpha) +
cairo_data[x*4+0];
+ src[x*3 + 1] = src[x*3 + 1] * (1.0 - alpha) +
cairo_data[x*4+1];
+ src[x*3 + 2] = src[x*3 + 2] * (1.0 - alpha) +
cairo_data[x*4+2];
}
src += nStride;
cairo_data += cairo_stride;
no idea of what's going on though, because I'm not familiar with alpha
blending.
HTH,
Ivan
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