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Fix potential undefined behaviour

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When `gray_color_space` is `NULL`, it is passed into `CGBitmapContextCreate()`. Since there are no guarantees in https://developer.apple.com/documentation/coregraphics/1455939-cgbitmapcontextcreate?language=objc to what happens in that case, depending on the implementation there may be undefined behaviour.
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Luflosi
2019-03-15 14:28:08 +01:00
parent d8d7765a82
commit 4b65b4ac2b
1 changed files with 2 additions and 1 deletions
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kitty/core_text.m
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@@ -376,8 +376,9 @@ static inline void
render_glyphs(CTFontRef font, unsigned int width, unsigned int height, unsigned int baseline, unsigned int num_glyphs) {
memset(render_buf, 0, width * height);
CGColorSpaceRef gray_color_space = CGColorSpaceCreateDeviceGray();
if (gray_color_space == NULL) fatal("Out of memory");
CGContextRef render_ctx = CGBitmapContextCreate(render_buf, width, height, 8, width, gray_color_space, (kCGBitmapAlphaInfoMask & kCGImageAlphaNone));
if (render_ctx == NULL || gray_color_space == NULL) fatal("Out of memory");
if (render_ctx == NULL) fatal("Out of memory");
CGContextSetShouldAntialias(render_ctx, true);
CGContextSetShouldSmoothFonts(render_ctx, true);
CGContextSetGrayFillColor(render_ctx, 1, 1); // white glyphs