gecko-dev/gfx/thebes/gfxQtNativeRenderer.h

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* 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 GFXQTNATIVERENDER_H_
#define GFXQTNATIVERENDER_H_
#include "gfxColor.h"
#include "gfxASurface.h"
#include "gfxContext.h"
#include "gfxXlibSurface.h"
#include "nsRect.h"
class QRect;
/**
* This class lets us take code that draws into an Xlib surface drawable and lets us
* use it to draw into any Thebes context. The user should subclass this class,
* override NativeDraw, and then call Draw(). The drawing will be subjected
* to all Thebes transformations, clipping etc.
*/
class THEBES_API gfxQtNativeRenderer {
public:
/**
* Perform the native drawing.
* @param offsetX draw at this offset into the given drawable
* @param offsetY draw at this offset into the given drawable
* @param clipRects an array of rects; clip to the union
* @param numClipRects the number of rects in the array, or zero if
* no clipping is required
*/
virtual nsresult DrawWithXlib(gfxXlibSurface *xsurf,
nsIntPoint offset,
nsIntRect* 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 visual passed in can be any visual, otherwise the
// visual passed in must be the default visual for dpy's default screen
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
};
struct DrawOutput {
nsRefPtr<gfxASurface> mSurface;
bool mUniformAlpha;
bool mUniformColor;
gfxRGBA mColor;
};
/**
* @param flags see above
* @param size Draw()'s drawing is guaranteed to be restricted to
* the rectangle (offset.x,offset.y,size.width,size.height)
* @param dpy a display to use for the drawing if ctx doesn't have one
* @param resultSurface 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.
*/
nsresult Draw(gfxContext* ctx, nsIntSize size,
uint32_t flags, Screen* screen, Visual* visual,
DrawOutput* output);
};
#endif /*GFXQTNATIVERENDER_H_*/