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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_VIZ_COMMON_TRANSITION_UTILS_H_
#define COMPONENTS_VIZ_COMMON_TRANSITION_UTILS_H_
#include <memory>
#include <string>
#include "base/callback_forward.h"
#include "components/viz/common/quads/compositor_render_pass.h"
#include "components/viz/common/viz_common_export.h"
namespace viz {
// This class is a collection of utils used by document transition API.
class VIZ_COMMON_EXPORT TransitionUtils {
public:
// Computes the opacity value of the given target_id as drawn in the root
// render pass. It looks through the chain of CompositorRenderPassDrawQuads to
// accumulate this value. Note that it is assumed, and not checked, that the
// render pass draw quads use "regular" opacity accumulation (i.e. kSrcOver
// blend mode).
static float ComputeAccumulatedOpacity(
const CompositorRenderPassList& render_passes,
CompositorRenderPassId target_id);
// Creates a deep copy of |source_pass| retaining all state. |filter_callback|
// is invoked for each render pass draw quad to let the caller modify the copy
// of these quads. If the callback returns true the quad is skipped otherwise
// it is copied as-is.
using FilterCallback =
base::RepeatingCallback<bool(const DrawQuad&, CompositorRenderPass&)>;
static std::unique_ptr<CompositorRenderPass> CopyPassWithQuadFiltering(
const CompositorRenderPass& source_pass,
FilterCallback filter_callback);
static CompositorRenderPassId NextRenderPassId(
const CompositorRenderPassId& id) {
return CompositorRenderPassId(id.GetUnsafeValue() + 1);
}
static std::string RenderPassListToString(
const CompositorRenderPassList& render_passes);
};
} // namespace viz
#endif // COMPONENTS_VIZ_COMMON_TRANSITION_UTILS_H_
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