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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/display/display_transform.h"
#include "base/notreached.h"
#include "ui/gfx/overlay_transform_utils.h"
namespace display {
gfx::Transform CreateRotationTransform(display::Display::Rotation rotation,
const gfx::SizeF& size_to_rotate) {
return OverlayTransformToTransform(
DisplayRotationToOverlayTransform(rotation), size_to_rotate);
}
gfx::OverlayTransform DisplayRotationToOverlayTransform(
display::Display::Rotation rotation) {
// Note that the angle provided by |rotation| here is the opposite direction
// of the physical rotation of the device, which is the space in which the UI
// prepares the scene (see
// https://developer.android.com/reference/android/view/Display#getRotation()
// for details).
//
// The rotation which needs to be applied by the display compositor to allow
// the buffers produced by it to be used directly by the system compositor
// needs to be the inverse of this rotation. Since display::Rotation is in
// clockwise direction while gfx::OverlayTransform is anti-clockwise, directly
// mapping them below performs this inversion.
switch (rotation) {
case display::Display::ROTATE_0:
return gfx::OVERLAY_TRANSFORM_NONE;
case display::Display::ROTATE_90:
return gfx::OVERLAY_TRANSFORM_ROTATE_CLOCKWISE_90;
case display::Display::ROTATE_180:
return gfx::OVERLAY_TRANSFORM_ROTATE_CLOCKWISE_180;
case display::Display::ROTATE_270:
return gfx::OVERLAY_TRANSFORM_ROTATE_CLOCKWISE_270;
}
NOTREACHED();
}
} // namespace display
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