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113 lines
3.6 KiB
C++
113 lines
3.6 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 GFX_IMAGESURFACE_H
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#define GFX_IMAGESURFACE_H
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#include "gfxASurface.h"
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#include "gfxPoint.h"
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// ARGB -- raw buffer.. wont be changed.. good for storing data.
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class gfxSubimageSurface;
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/**
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* A raw image buffer. The format can be set in the constructor. Its main
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* purpose is for storing read-only images and using it as a source surface,
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* but it can also be drawn to.
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*/
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class THEBES_API gfxImageSurface : public gfxASurface {
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public:
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/**
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* Construct an image surface around an existing buffer of image data.
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* @param aData A buffer containing the image data
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* @param aSize The size of the buffer
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* @param aStride The stride of the buffer
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* @param format Format of the data
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*
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* @see gfxImageFormat
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*/
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gfxImageSurface(unsigned char *aData, const gfxIntSize& aSize,
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long aStride, gfxImageFormat aFormat);
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/**
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* Construct an image surface.
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* @param aSize The size of the buffer
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* @param format Format of the data
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*
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* @see gfxImageFormat
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*/
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gfxImageSurface(const gfxIntSize& size, gfxImageFormat format, bool aClear = true);
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gfxImageSurface(cairo_surface_t *csurf);
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virtual ~gfxImageSurface();
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// ImageSurface methods
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gfxImageFormat Format() const { return mFormat; }
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virtual const gfxIntSize GetSize() const { return mSize; }
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PRInt32 Width() const { return mSize.width; }
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PRInt32 Height() const { return mSize.height; }
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/**
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* Distance in bytes between the start of a line and the start of the
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* next line.
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*/
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PRInt32 Stride() const { return mStride; }
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/**
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* Returns a pointer for the image data. Users of this function can
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* write to it, but must not attempt to free the buffer.
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*/
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unsigned char* Data() const { return mData; } // delete this data under us and die.
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/**
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* Returns the total size of the image data.
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*/
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PRInt32 GetDataSize() const { return mStride*mSize.height; }
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/* Fast copy from another image surface; returns TRUE if successful, FALSE otherwise */
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bool CopyFrom (gfxImageSurface *other);
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/* return new Subimage with pointing to original image starting from aRect.pos
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* and size of aRect.size. New subimage keeping current image reference
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*/
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already_AddRefed<gfxSubimageSurface> GetSubimage(const gfxRect& aRect);
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virtual already_AddRefed<gfxImageSurface> GetAsImageSurface();
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/** See gfxASurface.h. */
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NS_OVERRIDE
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virtual void MovePixels(const nsIntRect& aSourceRect,
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const nsIntPoint& aDestTopLeft);
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protected:
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gfxImageSurface();
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void InitWithData(unsigned char *aData, const gfxIntSize& aSize,
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long aStride, gfxImageFormat aFormat);
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void InitFromSurface(cairo_surface_t *csurf);
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long ComputeStride() const { return ComputeStride(mSize, mFormat); }
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static long ComputeStride(const gfxIntSize&, gfxImageFormat);
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void MakeInvalid();
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gfxIntSize mSize;
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bool mOwnsData;
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unsigned char *mData;
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gfxImageFormat mFormat;
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long mStride;
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};
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class THEBES_API gfxSubimageSurface : public gfxImageSurface {
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protected:
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friend class gfxImageSurface;
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gfxSubimageSurface(gfxImageSurface* aParent,
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unsigned char* aData,
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const gfxIntSize& aSize);
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private:
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nsRefPtr<gfxImageSurface> mParent;
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};
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#endif /* GFX_IMAGESURFACE_H */
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