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// Copyright 2012 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.
#ifndef CC_DRAW_PROPERTIES_H_
#define CC_DRAW_PROPERTIES_H_
#include "base/memory/scoped_ptr.h"
#include "ui/gfx/rect.h"
#include "ui/gfx/transform.h"
namespace cc {
// Container for properties that layers need to compute before they can be
// drawn.
template<typename LayerType, typename RenderSurfaceType>
struct CC_EXPORT DrawProperties {
DrawProperties()
: opacity(0)
, opacity_is_animating(false)
, screen_space_opacity_is_animating(false)
, target_space_transform_is_animating(false)
, screen_space_transform_is_animating(false)
, can_use_lcd_text(false)
, is_clipped(false)
, render_target(0)
, contents_scale_x(1)
, contents_scale_y(1)
, num_descendants_that_draw_content(0)
, descendants_can_clip_selves(false)
{
}
// Transforms objects from content space to target surface space, where
// this layer would be drawn.
gfx::Transform target_space_transform;
// Transforms objects from content space to screen space (viewport space).
gfx::Transform screen_space_transform;
// DrawProperties::opacity may be different than LayerType::opacity,
// particularly in the case when a renderSurface re-parents the layer's
// opacity, or when opacity is compounded by the hierarchy.
float opacity;
// XXXIsAnimating flags are used to indicate whether the drawProperties
// are actually meaningful on the main thread. When the properties are
// animating, the main thread may not have the same values that are used
// to draw.
bool opacity_is_animating;
bool screen_space_opacity_is_animating;
bool target_space_transform_is_animating;
bool screen_space_transform_is_animating;
// True if the layer can use LCD text.
bool can_use_lcd_text;
// True if the layer needs to be clipped by clipRect.
bool is_clipped;
// The layer whose coordinate space this layer draws into. This can be
// either the same layer (m_drawProperties.render_target == this) or an
// ancestor of this layer.
LayerType* render_target;
// The surface that this layer and its subtree would contribute to.
scoped_ptr<RenderSurfaceType> render_surface;
// This rect is in the layer's content space.
gfx::Rect visible_content_rect;
// In target surface space, the rect that encloses the clipped, drawable
// content of the layer.
gfx::Rect drawable_content_rect;
// In target surface space, the original rect that clipped this
// layer. This value is used to avoid unnecessarily changing GL scissor
// state.
gfx::Rect clip_rect;
// The scale used to move between layer space and content space, and bounds
// of the space. One is always a function of the other, but which one
// depends on the layer type. For picture layers, this is an ideal scale,
// and not always the one used.
float contents_scale_x;
float contents_scale_y;
gfx::Size content_bounds;
// Does not include this layer itself, only its children and descendants.
int num_descendants_that_draw_content;
// If true, every descendant in the sub-tree can clip itself without the
// need to use hardware sissoring or a new render target.
bool descendants_can_clip_selves;
};
} // namespace cc
#endif // CC_DRAW_PROPERTIES_H_
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