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// Copyright 2014 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 "android_webview/browser/parent_compositor_draw_constraints.h"
#include "android_webview/browser/child_frame.h"
namespace android_webview {
ParentCompositorDrawConstraints::ParentCompositorDrawConstraints()
: is_layer(false) {
}
ParentCompositorDrawConstraints::ParentCompositorDrawConstraints(
bool is_layer,
const gfx::Transform& transform,
const gfx::Rect& surface_rect)
: is_layer(is_layer), transform(transform), surface_rect(surface_rect) {
}
bool ParentCompositorDrawConstraints::NeedUpdate(
const ChildFrame& frame) const {
if (is_layer != frame.is_layer ||
transform != frame.transform_for_tile_priority) {
return true;
}
// Viewport for tile priority does not depend on surface rect in this case.
if (frame.offscreen_pre_raster)
return false;
if (is_layer) {
return surface_rect != frame.viewport_rect_for_tile_priority;
} else {
// Workaround for corner case. See crbug.com/417479.
return frame.viewport_rect_for_tile_priority.IsEmpty() &&
!surface_rect.IsEmpty();
}
}
} // namespace webview
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