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jpeskovandClaude Opus 5.5
f4fe2d9210
Review of #3777 (test report by mtlcl410). - A group wider than about 512 device pixels lost its blend mode in the tiles that a paint covers completely: on the bare pass canvas, vello_cpu fills such a tile without the blend mode. At 300 dpi, magenta then black with Difference drew black in the middle of the group, not green. Each ink pass now draws inside a layer of its own. - A nested isolated group that names another blending space (for example /CS /DeviceRGB) blends in that space (ISO 32000-2 §11.3.4). The interpreter now tells the device about such a group (Device::group_blends_outside_device_cmyk), and a pass that meets one declines, so the enclosing group is drawn as before. A non-isolated group's /CS is ignored (ISO 32000-2 §11.6.6, Table 145, CS: it takes its parent's space), so it stays in the enclosing group's CMYK. Test: raster::tests::isolated_cmyk_groups_blend_at_any_size_and_respect_nested_spaces. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>