void quartz_size_layout(void *layout, double* width, double* height, double* yoffset_layout)
{
/* get the typographic bounds */
CGFloat ascent = 0.0;
CGFloat descent = 0.0;
CGFloat leading = 0.0;
double typowidth = CTLineGetTypographicBounds((CTLineRef)layout, &ascent, &descent, &leading);
CGFloat typoheight = ascent + descent;
*width = typowidth;
*height = leading == 0.0 ? typoheight * 1.2 : typoheight + leading; /* if no leading, use 20% of height */
*yoffset_layout = ascent;
}
xy__Float draw__string(const char *s, int x, int y, int w, float pos) {
CFStringRef string = CFStringCreateWithCString(kCFAllocatorDefault, s, kCFStringEncodingUTF8);
if (font == NULL || font_color == NULL) {
fprintf(stderr, "Error in %s: need both font & font_color to be non-NULL.\n", __FUNCTION__);
return x;
}
CFStringRef keys[] = { kCTFontAttributeName, kCTForegroundColorAttributeName };
CFTypeRef values[] = { font, font_color };
CFDictionaryRef attributes =
CFDictionaryCreate(kCFAllocatorDefault, (const void**)&keys,
(const void**)&values, sizeof(keys) / sizeof(keys[0]),
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
CFAttributedStringRef attrString = CFAttributedStringCreate(kCFAllocatorDefault, string, attributes);
CFRelease(string);
CFRelease(attributes);
CTLineRef line = CTLineCreateWithAttributedString(attrString);
// This position set is needed to get a useful x_pos value on the next line.
CGContextSetTextPosition(ctx, x, y);
double x_pos = CTLineGetPenOffsetForFlush(line, pos, w);
CGFloat descent;
double line_width = CTLineGetTypographicBounds(line, NULL, &descent, NULL);
CGContextSetTextPosition(ctx, x + x_pos, y + descent);
CTLineDraw(line, ctx);
CFRelease(line);
return x + x_pos + line_width;
}
