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-// Copyright (c) 2010 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 PDF_PAINT_AGGREGATOR_H_
-#define PDF_PAINT_AGGREGATOR_H_
-
-#include <vector>
-
-#include "ppapi/cpp/image_data.h"
-#include "ppapi/cpp/rect.h"
-#include "ppapi/cpp/rect.h"
-
-// This class is responsible for aggregating multiple invalidation and scroll
-// commands to produce a scroll and repaint sequence. You can use this manually
-// to track your updates, but most applications will use the PaintManager to
-// additionally handle the necessary callbacks on top of the PaintAggregator
-// functionality.
-//
-// See http://code.google.com/p/ppapi/wiki/2DPaintingModel
-class PaintAggregator {
- public:
- // Stores information about a rectangle that has finished painting. The
- // PaintManager will paint it only when everything else on the screen is also
- // ready.
- struct ReadyRect {
- pp::Point offset;
- pp::Rect rect;
- pp::ImageData image_data;
- };
-
- struct PaintUpdate {
- PaintUpdate();
- ~PaintUpdate();
-
- // True if there is a scroll applied. This indicates that the scroll delta
- // and scroll_rect are nonzero (just as a convenience).
- bool has_scroll;
-
- // The amount to scroll by. Either the X or Y may be nonzero to indicate a
- // scroll in that direction, but there will never be a scroll in both
- // directions at the same time (this will be converted to a paint of the
- // region instead).
- //
- // If there is no scroll, this will be (0, 0).
- pp::Point scroll_delta;
-
- // The rectangle that should be scrolled by the scroll_delta. If there is no
- // scroll, this will be (0, 0, 0, 0). We only track one scroll command at
- // once. If there are multiple ones, they will be converted to invalidates.
- pp::Rect scroll_rect;
-
- // A list of all the individual dirty rectangles. This is an aggregated list
- // of all invalidate calls. Different rectangles may be unified to produce a
- // minimal list with no overlap that is more efficient to paint. This list
- // also contains the region exposed by any scroll command.
- std::vector<pp::Rect> paint_rects;
- };
-
- PaintAggregator();
-
- // There is a PendingUpdate if InvalidateRect or ScrollRect were called and
- // ClearPendingUpdate was not called.
- bool HasPendingUpdate() const;
- void ClearPendingUpdate();
-
- PaintUpdate GetPendingUpdate();
-
- // Sets the result of a call to the plugin to paint. This includes rects that
- // are finished painting (ready), and ones that are still in-progress
- // (pending).
- void SetIntermediateResults(const std::vector<ReadyRect>& ready,
- const std::vector<pp::Rect>& pending);
-
- // Returns the rectangles that are ready to be painted.
- std::vector<ReadyRect> GetReadyRects() const;
-
- // The given rect should be repainted.
- void InvalidateRect(const pp::Rect& rect);
-
- // The given rect should be scrolled by the given amounts.
- void ScrollRect(const pp::Rect& clip_rect, const pp::Point& amount);
-
- private:
- // This structure is an internal version of PaintUpdate. It's different in
- // two respects:
- //
- // - The scroll damange (area exposed by the scroll operation, if any) is
- // maintained separately from the dirty rects generated by calling
- // InvalidateRect. We need to know this distinction for some operations.
- //
- // - The paint bounds union is computed on the fly so we don't have to keep
- // a rectangle up-to-date as we do different operations.
- class InternalPaintUpdate {
- public:
- InternalPaintUpdate();
- ~InternalPaintUpdate();
-
- // Computes the rect damaged by scrolling within |scroll_rect| by
- // |scroll_delta|. This rect must be repainted. It is not included in
- // paint_rects.
- pp::Rect GetScrollDamage() const;
-
- pp::Point scroll_delta;
- pp::Rect scroll_rect;
-
- // Does not include the scroll damage rect unless
- // synthesized_scroll_damage_rect_ is set.
- std::vector<pp::Rect> paint_rects;
-
- // Rectangles that are finished painting.
- std::vector<ReadyRect> ready_rects;
-
- // Whether we have added the scroll damage rect to paint_rects yet or not.
- bool synthesized_scroll_damage_rect_;
- };
-
- pp::Rect ScrollPaintRect(const pp::Rect& paint_rect,
- const pp::Point& amount) const;
- void InvalidateScrollRect();
-
- // Internal method used by InvalidateRect. If |check_scroll| is true, then the
- // method checks if there's a pending scroll and if so also invalidates |rect|
- // in the new scroll position.
- void InvalidateRectInternal(const pp::Rect& rect, bool check_scroll);
-
- InternalPaintUpdate update_;
-};
-
-#endif // PDF_PAINT_AGGREGATOR_H_