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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/android/edge_effect_base.h"
namespace ui {
// static
gfx::Transform EdgeEffectBase::ComputeTransform(Edge edge,
const gfx::SizeF& viewport_size,
float offset) {
// Transforms assume the edge layers are anchored to their *top center point*.
switch (edge) {
case EDGE_TOP:
return gfx::Transform(1, 0, 0, 1, 0, offset);
case EDGE_LEFT:
return gfx::Transform(0, 1, -1, 0, -viewport_size.height() / 2.f + offset,
viewport_size.height() / 2.f);
case EDGE_BOTTOM:
return gfx::Transform(-1, 0, 0, -1, 0, viewport_size.height() + offset);
case EDGE_RIGHT:
return gfx::Transform(0, -1, 1, 0, -viewport_size.height() / 2.f +
viewport_size.width() + offset,
viewport_size.height() / 2.f);
default:
NOTREACHED() << "Invalid edge: " << edge;
return gfx::Transform();
};
}
// static
gfx::SizeF EdgeEffectBase::ComputeOrientedSize(
Edge edge,
const gfx::SizeF& viewport_size) {
switch (edge) {
case EDGE_TOP:
case EDGE_BOTTOM:
return viewport_size;
case EDGE_LEFT:
case EDGE_RIGHT:
return gfx::SizeF(viewport_size.height(), viewport_size.width());
default:
NOTREACHED() << "Invalid edge: " << edge;
return gfx::SizeF();
};
}
} // namespace ui
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