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Finish up title rendering for CoreText

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Kovid Goyal 2021-10-17 08:26:35 +05:30
parent 90dfabc644
commit 2a842e36a1
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GPG Key ID: 06BC317B515ACE7C
1 changed files with 30 additions and 5 deletions
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35
kitty/core_text.m
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@ -541,19 +541,35 @@ render_simple_text_impl(PyObject *s, const char *text, unsigned int baseline) {
}
static bool
ensure_ui_font(void) {
if (!window_title_font) window_title_font = CTFontCreateUIFontForLanguage(kCTFontUIFontWindowTitle, 0.f, NULL);
return !!window_title_font;
ensure_ui_font(size_t in_height) {
static size_t for_height = 0;
if (window_title_font) {
if (for_height == in_height) return true;
CFRelease(window_title_font);
}
window_title_font = CTFontCreateUIFontForLanguage(kCTFontUIFontWindowTitle, 0.f, NULL);
if (!window_title_font) return false;
CGFloat line_height = MAX(1, floor(CTFontGetAscent(window_title_font) + CTFontGetDescent(window_title_font) + MAX(0, CTFontGetLeading(window_title_font)) + 0.5));
CGFloat pts_per_px = CTFontGetSize(window_title_font) / line_height;
CGFloat desired_size = in_height * pts_per_px;
if (desired_size != CTFontGetSize(window_title_font)) {
CTFontRef sized = CTFontCreateCopyWithAttributes(window_title_font, desired_size, NULL, NULL);
CFRelease(window_title_font);
window_title_font = sized;
if (!window_title_font) return false;
}
for_height = in_height;
return true;
}
bool
cocoa_render_line_of_text(const char *text, const color_type fg, const color_type bg, uint8_t *rgba_output, const size_t width, const size_t height) {
if (!ensure_ui_font()) return false;
CGColorSpaceRef color_space = CGColorSpaceCreateDeviceRGB();
if (color_space == NULL) return false;
CGContextRef ctx = CGBitmapContextCreate(rgba_output, width, height, 8, 4 * width, color_space, kCGImageAlphaPremultipliedLast | kCGBitmapByteOrderDefault);
CGColorSpaceRelease(color_space);
if (ctx == NULL) return false;
if (!ensure_ui_font(height)) return false;
CGContextSetShouldAntialias(ctx, true);
CGContextSetShouldSmoothFonts(ctx, true); // sub-pixel antialias
@ -565,7 +581,16 @@ cocoa_render_line_of_text(const char *text, const color_type fg, const color_typ
CGContextSetRGBFillColor(ctx, ((fg >> 16) & 0xff) / 255.f, ((fg >> 8) & 0xff) / 255.f, (fg & 0xff) / 255.f, 1.f);
CGContextSetRGBStrokeColor(ctx, ((fg >> 16) & 0xff) / 255.f, ((fg >> 8) & 0xff) / 255.f, (fg & 0xff) / 255.f, 1.f);
(void)text;
NSAttributedString *str = [[NSAttributedString alloc] initWithString:@(text) attributes:@{(NSString *)kCTFontAttributeName: (__bridge id)window_title_font}];
if (!str) { CGContextRelease(ctx); return false; }
CTLineRef line = CTLineCreateWithAttributedString((CFAttributedStringRef)str);
[str release];
if (!line) { CGContextRelease(ctx); return false; }
CGFloat ascent, descent, leading;
CTLineGetTypographicBounds(line, &ascent, &descent, &leading);
CGContextSetTextPosition(ctx, 0, descent);
CTLineDraw(line, ctx);
CFRelease(line);
CGContextRelease(ctx);
return true;
}