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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef ASH_ROUNDED_DISPLAY_ROUNDED_DISPLAY_GUTTER_H_
#define ASH_ROUNDED_DISPLAY_ROUNDED_DISPLAY_GUTTER_H_
#include <memory>
#include <vector>
#include "ash/ash_export.h"
#include "ash/frame_sink/ui_resource.h"
#include "ui/gfx/geometry/point.h"
#include "ui/gfx/geometry/rect.h"
namespace gfx {
class Canvas;
} // namespace gfx
namespace ash {
// A RoundedDisplayGutter represents a collection of rounded corners of a
// display. A gutter is a texture factory that knows how to draw the
// corresponding masks for all rounded corners on a single texture. Generated
// textures are in target (pixel) space.
class ASH_EXPORT RoundedDisplayGutter {
public:
// RoundedCorner represents one of the rounded corners of a display.
class RoundedCorner {
public:
// Enumerates the position of RoundedCorner on a display.
enum Position {
kUpperLeft = 1u << 0,
kUpperRight = 1u << 1,
kLowerLeft = 1u << 2,
kLowerRight = 1u << 3
};
RoundedCorner(Position position, int radius, const gfx::Point& origin);
RoundedCorner(const RoundedCorner&) = delete;
RoundedCorner& operator=(const RoundedCorner&) = delete;
RoundedCorner(RoundedCorner&&);
RoundedCorner& operator=(RoundedCorner&&);
~RoundedCorner();
int radius() const { return radius_; }
Position position() const { return position_; }
// Returns the bounds of the corners in display coordinates.
const gfx::Rect& bounds() const { return bounds_in_pixels_; }
bool DoesPaint() const;
// Paints a rounded corner on the canvas. We decide how to paint the corner
// based on the RoundedCorner position.
void Paint(gfx::Canvas* canvas) const;
private:
void PaintCornerHelper(gfx::Canvas* canvas) const;
Position position_;
// Radius of the corner in pixels.
int radius_;
// Bounds of the corner in the display.
gfx::Rect bounds_in_pixels_;
};
static std::unique_ptr<RoundedDisplayGutter> CreateGutter(
std::vector<RoundedCorner>&& corners,
bool is_overlay);
RoundedDisplayGutter(std::vector<RoundedCorner>&& corners, bool is_overlay);
RoundedDisplayGutter(const RoundedDisplayGutter&) = delete;
RoundedDisplayGutter& operator=(const RoundedDisplayGutter&) = delete;
~RoundedDisplayGutter();
// Returns the bounds in pixels of the gutter in display coordinates.
const gfx::Rect& bounds() const;
const std::vector<RoundedCorner>& GetGutterCorners() const {
return corners_;
}
bool NeedsOverlays() const { return is_overlay_; }
// Returns a unique identifier that can be used to consistently map a
// texture back to the type of gutter.
// For example, texture generated for gutter for top-left rounded corner and a
// texture generated for gutter with bottom-left rounded corner are identical
// in terms of size, buffer format etc but will have unique ui_source_id.
UiSourceId ui_source_id() const;
// Paints all the corner's mask textures on the canvas.
void Paint(gfx::Canvas* canvas) const;
private:
gfx::Rect CalculateGutterBounds() const;
UiSourceId CalculateUiSourceId() const;
UiSourceId ui_source_id_ = kInvalidUiSourceId;
// The rounded display corners that the gutter draws.
const std::vector<RoundedCorner> corners_;
// True if the textures should be rendered using hardware overlays system.
bool is_overlay_ = true;
// Bounds of gutter in display coordinates.
gfx::Rect bounds_in_pixels_;
};
} // namespace ash
#endif // ASH_ROUNDED_DISPLAY_ROUNDED_DISPLAY_GUTTER_H_
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