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[Impeller] Use minimal coverage for EntityPass clip restores (flutter/engine#39540)

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Brandon DeRosier 2023-02-10 11:12:20 -08:00 committed by GitHub
parent 9b1a97cba6
commit 4be6342a2c
1 changed files with 13 additions and 0 deletions
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13
engine/src/flutter/impeller/entity/entity_pass.cc
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@ -12,6 +12,7 @@
#include "flutter/fml/macros.h"
#include "flutter/fml/trace_event.h"
#include "impeller/base/validation.h"
#include "impeller/entity/contents/clip_contents.h"
#include "impeller/entity/contents/content_context.h"
#include "impeller/entity/contents/filters/color_filter_contents.h"
#include "impeller/entity/contents/filters/inputs/filter_input.h"
@ -456,12 +457,24 @@ bool EntityPass::OnRender(
element_entity.GetStencilDepth() - stencil_depth_floor;
FML_DCHECK(restoration_depth < stencil_stack.size());
// We only need to restore the area that covers the coverage of the
// stencil rect at target depth + 1.
std::optional<Rect> restore_coverage =
(restoration_depth + 1 < stencil_stack.size())
? stencil_stack[restoration_depth + 1].coverage
: std::nullopt;
stencil_stack.resize(restoration_depth + 1);
if (!stencil_stack.back().coverage.has_value()) {
// Running this restore op won't make anything renderable, so skip it.
return true;
}
auto restore_contents = static_cast<ClipRestoreContents*>(
element_entity.GetContents().get());
restore_contents->SetRestoreCoverage(restore_coverage);
} break;
}