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fix data corruption on growing the Atlas

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This commit is contained in:
Mitchell Hashimoto
2022-08-24 12:14:02 -07:00
parent 4751e3185d
commit d8248ef0ae
1 changed files with 69 additions and 1 deletions
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70
src/Atlas.zig
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@ -254,7 +254,7 @@ pub fn grow(self: *Atlas, alloc: Allocator, size_new: u32) Allocator.Error!void
.y = 1, // skip the first border row
.width = size_old,
.height = size_old - 2, // skip the last border row
}, data_old[size_old..]);
}, data_old[size_old * @enumToInt(self.format) ..]);
}
// Empty the atlas. This doesn't reclaim any previously allocated memory.
@ -358,3 +358,71 @@ test "writing RGB data" {
try testing.expectEqual(@as(u8, 5), atlas.data[65 * depth + 1]);
try testing.expectEqual(@as(u8, 6), atlas.data[65 * depth + 2]);
}
test "grow RGB" {
const alloc = testing.allocator;
// Atlas is 4x4 so its a 1px border meaning we only have 2x2 available
var atlas = try init(alloc, 4, .rgb);
defer atlas.deinit(alloc);
// Get our 2x2, which should be ALL our usable space
const reg = try atlas.reserve(alloc, 2, 2);
try testing.expectError(Error.AtlasFull, atlas.reserve(alloc, 1, 1));
// This is RGB so its 3 bpp
atlas.set(reg, &[_]u8{
10, 11, 12, // (0, 0) (x, y) from top-left
13, 14, 15, // (1, 0)
20, 21, 22, // (0, 1)
23, 24, 25, // (1, 1)
});
// Our top left skips the first row (size * depth) and the first
// column (depth) for the 1px border.
const depth = @intCast(usize, @enumToInt(atlas.format));
var tl = (atlas.size * depth) + depth;
try testing.expectEqual(@as(u8, 10), atlas.data[tl]);
try testing.expectEqual(@as(u8, 11), atlas.data[tl + 1]);
try testing.expectEqual(@as(u8, 12), atlas.data[tl + 2]);
try testing.expectEqual(@as(u8, 13), atlas.data[tl + 3]);
try testing.expectEqual(@as(u8, 14), atlas.data[tl + 4]);
try testing.expectEqual(@as(u8, 15), atlas.data[tl + 5]);
try testing.expectEqual(@as(u8, 0), atlas.data[tl + 6]); // border
tl += (atlas.size * depth); // next row
try testing.expectEqual(@as(u8, 20), atlas.data[tl]);
try testing.expectEqual(@as(u8, 21), atlas.data[tl + 1]);
try testing.expectEqual(@as(u8, 22), atlas.data[tl + 2]);
try testing.expectEqual(@as(u8, 23), atlas.data[tl + 3]);
try testing.expectEqual(@as(u8, 24), atlas.data[tl + 4]);
try testing.expectEqual(@as(u8, 25), atlas.data[tl + 5]);
try testing.expectEqual(@as(u8, 0), atlas.data[tl + 6]); // border
// Expand by exactly 1 should fit our new 1x1 block.
try atlas.grow(alloc, atlas.size + 1);
// Data should be in same place accounting for the new size
tl = (atlas.size * depth) + depth;
try testing.expectEqual(@as(u8, 10), atlas.data[tl]);
try testing.expectEqual(@as(u8, 11), atlas.data[tl + 1]);
try testing.expectEqual(@as(u8, 12), atlas.data[tl + 2]);
try testing.expectEqual(@as(u8, 13), atlas.data[tl + 3]);
try testing.expectEqual(@as(u8, 14), atlas.data[tl + 4]);
try testing.expectEqual(@as(u8, 15), atlas.data[tl + 5]);
try testing.expectEqual(@as(u8, 0), atlas.data[tl + 6]); // border
tl += (atlas.size * depth); // next row
try testing.expectEqual(@as(u8, 20), atlas.data[tl]);
try testing.expectEqual(@as(u8, 21), atlas.data[tl + 1]);
try testing.expectEqual(@as(u8, 22), atlas.data[tl + 2]);
try testing.expectEqual(@as(u8, 23), atlas.data[tl + 3]);
try testing.expectEqual(@as(u8, 24), atlas.data[tl + 4]);
try testing.expectEqual(@as(u8, 25), atlas.data[tl + 5]);
try testing.expectEqual(@as(u8, 0), atlas.data[tl + 6]); // border
// Should fit the new blocks around the edges
_ = try atlas.reserve(alloc, 1, 3);
_ = try atlas.reserve(alloc, 2, 1);
try testing.expectError(Error.AtlasFull, atlas.reserve(alloc, 1, 1));
}