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106 lines
4.3 KiB
C++
106 lines
4.3 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef GFXXLIBNATIVERENDER_H_
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#define GFXXLIBNATIVERENDER_H_
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#include "nsPoint.h"
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#include "nsRect.h"
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#include <X11/Xlib.h>
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namespace mozilla {
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namespace gfx {
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class DrawTarget;
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}
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}
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class gfxASurface;
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class gfxContext;
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struct nsIntRect;
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struct nsIntPoint;
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struct nsIntSize;
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typedef struct _cairo cairo_t;
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typedef struct _cairo_surface cairo_surface_t;
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/**
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* This class lets us take code that draws into an X drawable and lets us
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* use it to draw into any Thebes context. The user should subclass this class,
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* override DrawWithXib, and then call Draw(). The drawing will be subjected
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* to all Thebes transformations, clipping etc.
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*/
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class gfxXlibNativeRenderer {
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public:
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/**
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* Perform the native drawing.
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* @param surface the cairo_surface_t for drawing. Must be a cairo_xlib_surface_t.
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* The extents of this surface do not necessarily cover the
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* entire rectangle with size provided to Draw().
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* @param offset draw at this offset into the given drawable
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* @param clipRects an array of rectangles; clip to the union.
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* Any rectangles provided will be contained by the
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* rectangle with size provided to Draw and by the
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* surface extents.
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* @param numClipRects the number of rects in the array, or zero if
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* no clipping is required.
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*/
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virtual nsresult DrawWithXlib(cairo_surface_t* surface,
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nsIntPoint offset,
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nsIntRect* clipRects, uint32_t numClipRects) = 0;
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enum {
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// If set, then Draw() is opaque, i.e., every pixel in the intersection
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// of the clipRect and (offset.x,offset.y,bounds.width,bounds.height)
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// will be set and there is no dependence on what the existing pixels
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// in the drawable are set to.
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DRAW_IS_OPAQUE = 0x01,
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// If set, then numClipRects can be zero or one
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DRAW_SUPPORTS_CLIP_RECT = 0x04,
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// If set, then numClipRects can be any value. If neither this
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// nor CLIP_RECT are set, then numClipRects will be zero
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DRAW_SUPPORTS_CLIP_LIST = 0x08,
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// If set, then the surface in the callback may have any visual;
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// otherwise the pixels will have the same format as the visual
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// passed to 'Draw'.
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DRAW_SUPPORTS_ALTERNATE_VISUAL = 0x10,
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// If set, then the Screen 'screen' in the callback can be different
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// from the default Screen of the display passed to 'Draw' and can be
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// on a different display.
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DRAW_SUPPORTS_ALTERNATE_SCREEN = 0x20
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};
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/**
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* @param flags see above
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* @param size the size of the rectangle being drawn;
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* the caller guarantees that drawing will not extend beyond the rectangle
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* (0,0,size.width,size.height).
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* @param screen a Screen to use for the drawing if ctx doesn't have one.
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* @param visual a Visual to use for the drawing if ctx doesn't have one.
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* @param result if non-null, we will try to capture a copy of the
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* rendered image into a surface similar to the surface of ctx; if
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* successful, a pointer to the new gfxASurface is stored in *resultSurface,
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* otherwise *resultSurface is set to nullptr.
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*/
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void Draw(gfxContext* ctx, nsIntSize size,
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uint32_t flags, Screen *screen, Visual *visual);
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private:
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bool DrawDirect(gfxContext *ctx, nsIntSize bounds,
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uint32_t flags, Screen *screen, Visual *visual);
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bool DrawCairo(cairo_t* cr, nsIntSize size,
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uint32_t flags, Screen *screen, Visual *visual);
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void DrawFallback(mozilla::gfx::DrawTarget* dt, gfxContext* ctx,
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gfxASurface* aSurface, nsIntSize& size,
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nsIntRect& drawingRect, bool canDrawOverBackground,
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uint32_t flags, Screen* screen, Visual* visual);
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bool DrawOntoTempSurface(cairo_surface_t *tempXlibSurface,
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nsIntPoint offset);
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};
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#endif /*GFXXLIBNATIVERENDER_H_*/
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