gecko-dev/gfx/thebes/gfxPattern.h

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Oracle Corporation code.
 *
 * The Initial Developer of the Original Code is Oracle Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2005
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Stuart Parmenter <stuart@mozilla.com>
 *
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 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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#ifndef GFX_PATTERN_H
#define GFX_PATTERN_H

#include "gfxTypes.h"

#include "gfxColor.h"
#include "gfxMatrix.h"
#include "nsISupportsImpl.h"
#include "nsAutoPtr.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/Util.h"

class gfxContext;
class gfxASurface;
typedef struct _cairo_pattern cairo_pattern_t;


class THEBES_API gfxPattern {
    NS_INLINE_DECL_REFCOUNTING(gfxPattern)

public:
    gfxPattern(cairo_pattern_t *aPattern);
    gfxPattern(const gfxRGBA& aColor);
    gfxPattern(gfxASurface *surface); // from another surface
    // linear
    gfxPattern(gfxFloat x0, gfxFloat y0, gfxFloat x1, gfxFloat y1); // linear
    gfxPattern(gfxFloat cx0, gfxFloat cy0, gfxFloat radius0,
               gfxFloat cx1, gfxFloat cy1, gfxFloat radius1); // radial
    gfxPattern(mozilla::gfx::SourceSurface *aSurface,
               const mozilla::gfx::Matrix &aTransform); // Azure
    virtual ~gfxPattern();

    cairo_pattern_t *CairoPattern();
    void AddColorStop(gfxFloat offset, const gfxRGBA& c);

    void SetMatrix(const gfxMatrix& matrix);
    gfxMatrix GetMatrix() const;

    /* Get an Azure Pattern for the current Cairo pattern. aPattern transform
     * specifies the transform that was set on the DrawTarget when the pattern
     * was set. When this is NULL it is assumed the transform is identical
     * to the current transform.
     */
    mozilla::gfx::Pattern *GetPattern(mozilla::gfx::DrawTarget *aTarget,
                                      mozilla::gfx::Matrix *aPatternTransform = nsnull);
    bool IsOpaque();

    enum GraphicsExtend {
        EXTEND_NONE,
        EXTEND_REPEAT,
        EXTEND_REFLECT,
        EXTEND_PAD,

        // Our own private flag for setting either NONE or PAD,
        // depending on what the platform does for NONE.  This is only
        // relevant for surface patterns; for all other patterns, it
        // behaves identical to PAD.  On MacOS X, this becomes "NONE",
        // because Quartz does the thing that we want at image edges;
        // similarily on the win32 printing surface, since
        // everything's done with GDI there.  On other platforms, it
        // usually becomes PAD.
        EXTEND_PAD_EDGE = 1000
    };

    // none, repeat, reflect
    void SetExtend(GraphicsExtend extend);
    GraphicsExtend Extend() const;

    enum GraphicsPatternType {
        PATTERN_SOLID,
        PATTERN_SURFACE,
        PATTERN_LINEAR,
        PATTERN_RADIAL
    };

    GraphicsPatternType GetType() const;

    int CairoStatus();

    enum GraphicsFilter {
        FILTER_FAST,
        FILTER_GOOD,
        FILTER_BEST,
        FILTER_NEAREST,
        FILTER_BILINEAR,
        FILTER_GAUSSIAN
    };

    void SetFilter(GraphicsFilter filter);
    GraphicsFilter Filter() const;

    /* returns TRUE if it succeeded */
    bool GetSolidColor(gfxRGBA& aColor);

    already_AddRefed<gfxASurface> GetSurface();

protected:
    cairo_pattern_t *mPattern;

    void AdjustTransformForPattern(mozilla::gfx::Matrix &aPatternTransform,
                                   const mozilla::gfx::Matrix &aCurrentTransform,
                                   const mozilla::gfx::Matrix *aOriginalTransform);

    union {
      mozilla::AlignedStorage2<mozilla::gfx::ColorPattern> mColorPattern;
      mozilla::AlignedStorage2<mozilla::gfx::LinearGradientPattern> mLinearGradientPattern;
      mozilla::AlignedStorage2<mozilla::gfx::RadialGradientPattern> mRadialGradientPattern;
      mozilla::AlignedStorage2<mozilla::gfx::SurfacePattern> mSurfacePattern;
    };

    mozilla::gfx::Pattern *mGfxPattern;

    mozilla::RefPtr<mozilla::gfx::SourceSurface> mSourceSurface;
    mozilla::gfx::Matrix mTransform;
    mozilla::RefPtr<mozilla::gfx::GradientStops> mStops;
    mozilla::gfx::ExtendMode mExtend;
    mozilla::gfx::Filter mFilter;
};

#endif /* GFX_PATTERN_H */