cairo_surface_t* GlyphLayerInterfaceBlur::createBlurredSurface(
cairo_format_t format,
cairo_pattern_t* pattern,
unsigned int width,
unsigned int height
) {
unsigned int blurSize = _getBlurSize();
// Create a temporary small surface and then copy that to the bigger one.
cairo_surface_t* tmp = cairo_image_surface_create(
format,
width + (blurSize * 4),
height + (blurSize * 4)
);
if(cairo_surface_status(tmp)) return 0;
cairo_t* tc = cairo_create(tmp);
if(cairo_status(tc)) return 0;
cairo_translate(tc, blurSize * 2, blurSize * 2);
cairo_set_source(tc, pattern);
cairo_paint(tc);
cairo_destroy(tc);
if(_deviation > 0.0f) osgPairo::gaussianBlur(tmp, _radius, _deviation);
return tmp;
}
bool GlyphLayerShadowInset::render(
cairo_t* c,
cairo_glyph_t* glyph,
unsigned int width,
unsigned int height
) {
if(cairo_status(c) || !glyph) return false;
cairo_push_group(c);
cairo_glyph_path(c, glyph, 1);
cairo_clip(c);
cairo_translate(c, getOffsetX(), getOffsetY());
// cairo_set_line_join(c, CAIRO_LINE_JOIN_ROUND);
cairo_set_line_width(c, static_cast<double>(_radius) - 0.5f);
cairo_glyph_path(c, glyph, 1);
cairo_stroke(c);
cairo_pattern_t* pattern = cairo_pop_group(c);
cairo_surface_t* tmp = createBlurredSurface(CAIRO_FORMAT_A8, pattern, width, height);
cairo_set_source_surface(
c,
tmp,
-static_cast<double>(_getBlurSize()) * 2,
-static_cast<double>(_getBlurSize()) * 2
);
cairo_glyph_path(c, glyph, 1);
cairo_clip(c);
cairo_paint(c);
cairo_surface_destroy(tmp);
cairo_pattern_destroy(pattern);
return true;
}
