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font: don't use intCast on index

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This is a weird one. By using intCast on the `idx` I am periodically
getting a panic on index out of bounds where the index is larger than
FontIndex can possibly be. Very strange!

I tried to just remove intCasts and believe it or not that worked.
Previously, `cat /dev/urandom` would trigger the issue in seconds and
now I've had it running 20+ minutes without the issue.

The additional `if` check is just a safety mechanism
This commit is contained in:
Mitchell Hashimoto
2023-08-31 21:13:04 -07:00
parent 36756cc866
commit 3bd77259bf
1 changed files with 27 additions and 2 deletions
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29
src/font/Group.zig
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@ -303,7 +303,8 @@ fn indexForCodepointExact(self: Group, cp: u32, style: Style, p: ?Presentation)
/// necessarily force the font to load.
pub fn hasCodepoint(self: *Group, index: FontIndex, cp: u32, p: ?Presentation) bool {
const list = self.faces.getPtr(index.style);
const item = list.items[@intCast(index.idx)];
if (index.idx >= list.items.len) return false;
const item = list.items[index.idx];
return switch (item) {
.deferred => |v| v.hasCodepoint(cp, p),
.loaded => |face| loaded: {
@ -330,7 +331,7 @@ pub fn presentationFromIndex(self: *Group, index: FontIndex) !font.Presentation
pub fn faceFromIndex(self: *Group, index: FontIndex) !*Face {
if (index.special() != null) return error.SpecialHasNoFace;
const list = self.faces.getPtr(index.style);
const item = &list.items[@intCast(index.idx)];
const item = &list.items[index.idx];
return switch (item.*) {
.deferred => |*d| deferred: {
const face = try d.load(self.lib, self.size);
@ -553,6 +554,30 @@ test {
}
}
test "face count limit" {
const testing = std.testing;
const alloc = testing.allocator;
const testFont = @import("test.zig").fontRegular;
var atlas_greyscale = try font.Atlas.init(alloc, 512, .greyscale);
defer atlas_greyscale.deinit(alloc);
var lib = try Library.init();
defer lib.deinit();
var group = try init(alloc, lib, .{ .points = 12 });
defer group.deinit();
for (0..FontIndex.Special.start - 1) |_| {
try group.addFace(.regular, .{ .loaded = try Face.init(lib, testFont, .{ .points = 12 }) });
}
try testing.expectError(error.GroupFull, group.addFace(
.regular,
.{ .loaded = try Face.init(lib, testFont, .{ .points = 12 }) },
));
}
test "box glyph" {
const testing = std.testing;
const alloc = testing.allocator;