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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef GFXXLIBNATIVERENDER_H_
#define GFXXLIBNATIVERENDER_H_

#include "nsPoint.h"
#include "nsRect.h"
#include "mozilla/gfx/Rect.h"
#include "mozilla/gfx/Point.h"
#include <X11/Xlib.h>

namespace mozilla {
namespace gfx {
class DrawTarget;
}
}  // namespace mozilla

class gfxASurface;
class gfxContext;
typedef struct _cairo cairo_t;
typedef struct _cairo_surface cairo_surface_t;

/**
 * This class lets us take code that draws into an X drawable and lets us
 * use it to draw into any Thebes context. The user should subclass this class,
 * override DrawWithXib, and then call Draw(). The drawing will be subjected
 * to all Thebes transformations, clipping etc.
 */
class gfxXlibNativeRenderer {
 public:
  /**
   * Perform the native drawing.
   * @param surface the cairo_surface_t for drawing. Must be a
   * cairo_xlib_surface_t. The extents of this surface do not necessarily cover
   * the entire rectangle with size provided to Draw().
   * @param offset  draw at this offset into the given drawable
   * @param clipRects an array of rectangles; clip to the union.
   *                  Any rectangles provided will be contained by the
   *                  rectangle with size provided to Draw and by the
   *                  surface extents.
   * @param numClipRects the number of rects in the array, or zero if
   *                     no clipping is required.
   */
  virtual nsresult DrawWithXlib(cairo_surface_t* surface,
                                mozilla::gfx::IntPoint offset,
                                mozilla::gfx::IntRect* clipRects,
                                uint32_t numClipRects) = 0;

  enum {
    // If set, then Draw() is opaque, i.e., every pixel in the intersection
    // of the clipRect and (offset.x,offset.y,bounds.width,bounds.height)
    // will be set and there is no dependence on what the existing pixels
    // in the drawable are set to.
    DRAW_IS_OPAQUE = 0x01,
    // If set, then numClipRects can be zero or one
    DRAW_SUPPORTS_CLIP_RECT = 0x04,
    // If set, then numClipRects can be any value. If neither this
    // nor CLIP_RECT are set, then numClipRects will be zero
    DRAW_SUPPORTS_CLIP_LIST = 0x08,
    // If set, then the surface in the callback may have any visual;
    // otherwise the pixels will have the same format as the visual
    // passed to 'Draw'.
    DRAW_SUPPORTS_ALTERNATE_VISUAL = 0x10,
    // If set, then the Screen 'screen' in the callback can be different
    // from the default Screen of the display passed to 'Draw' and can be
    // on a different display.
    DRAW_SUPPORTS_ALTERNATE_SCREEN = 0x20
  };

  /**
   * @param flags see above
   * @param size the size of the rectangle being drawn;
   * the caller guarantees that drawing will not extend beyond the rectangle
   * (0,0,size.width,size.height).
   * @param screen a Screen to use for the drawing if ctx doesn't have one.
   * @param visual a Visual to use for the drawing if ctx doesn't have one.
   * @param result if non-null, we will try to capture a copy of the
   * rendered image into a surface similar to the surface of ctx; if
   * successful, a pointer to the new gfxASurface is stored in *resultSurface,
   * otherwise *resultSurface is set to nullptr.
   */
  void Draw(gfxContext* ctx, mozilla::gfx::IntSize size, uint32_t flags,
            Screen* screen, Visual* visual);

 private:
  bool DrawDirect(mozilla::gfx::DrawTarget* aDT, mozilla::gfx::IntSize bounds,
                  uint32_t flags, Screen* screen, Visual* visual);

  bool DrawCairo(cairo_t* cr, mozilla::gfx::IntSize size, uint32_t flags,
                 Screen* screen, Visual* visual);

  void DrawFallback(mozilla::gfx::DrawTarget* dt, gfxContext* ctx,
                    gfxASurface* aSurface, mozilla::gfx::IntSize& size,
                    mozilla::gfx::IntRect& drawingRect,
                    bool canDrawOverBackground, uint32_t flags, Screen* screen,
                    Visual* visual);

  bool DrawOntoTempSurface(cairo_surface_t* tempXlibSurface,
                           mozilla::gfx::IntPoint offset);
};

#endif /*GFXXLIBNATIVERENDER_H_*/