mirror of
https://github.com/classilla/tenfourfox.git
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190 lines
6.2 KiB
C++
190 lines
6.2 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 "mozilla/MemoryReporting.h"
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#include "mozilla/RefPtr.h"
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#include "gfxASurface.h"
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#include "nsAutoPtr.h"
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#include "nsSize.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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namespace mozilla {
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namespace gfx {
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class DataSourceSurface;
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class SourceSurface;
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} // namespace gfx
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} // namespace mozilla
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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 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 mozilla::gfx::IntSize& 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 mozilla::gfx::IntSize& size, gfxImageFormat format, bool aClear = true);
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/**
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* Construct an image surface, with a specified stride and allowing the
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* allocation of more memory than required for the storage of the surface
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* itself. When aStride and aMinimalAllocation are <=0, this constructor
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* is the equivalent of the preceeding one.
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*
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* @param format Format of the data
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* @param aSize The size of the buffer
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* @param aStride The stride of the buffer - if <=0, use ComputeStride()
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* @param aMinimalAllocation Allocate at least this many bytes. If smaller
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* than width * stride, or width*stride <=0, this value is ignored.
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* @param aClear
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*
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* @see gfxImageFormat
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*/
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gfxImageSurface(const mozilla::gfx::IntSize& aSize, gfxImageFormat aFormat,
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long aStride, int32_t aMinimalAllocation, bool aClear);
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explicit 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 mozilla::gfx::IntSize GetSize() const override { return mSize; }
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int32_t Width() const {
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if (mSize.width < 0) {
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return 0;
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}
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return mSize.width;
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}
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int32_t Height() const {
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if (mSize.height < 0) {
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return 0;
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}
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return mSize.height;
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}
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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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int32_t 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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int32_t GetDataSize() const {
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if (mStride < 0 || mSize.height < 0) {
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return 0;
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}
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return mStride*mSize.height;
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}
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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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/**
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* Fast copy from a source surface; returns TRUE if successful, FALSE otherwise
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* Assumes that the format of this surface is compatable with aSurface
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*/
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bool CopyFrom (mozilla::gfx::SourceSurface *aSurface);
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/**
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* Fast copy to a source surface; returns TRUE if successful, FALSE otherwise
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* Assumes that the format of this surface is compatible with aSurface
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*/
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bool CopyTo (mozilla::gfx::SourceSurface *aSurface);
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/**
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* Copy to a Moz2D DataSourceSurface.
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* Marked as virtual so that browsercomps can access this method.
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*/
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virtual already_AddRefed<mozilla::gfx::DataSourceSurface> CopyToB8G8R8A8DataSourceSurface();
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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() override;
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/** See gfxASurface.h. */
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static long ComputeStride(const mozilla::gfx::IntSize&, gfxImageFormat);
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virtual size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
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override;
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virtual size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
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override;
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virtual bool SizeOfIsMeasured() const override;
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protected:
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gfxImageSurface();
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void InitWithData(unsigned char *aData, const mozilla::gfx::IntSize& aSize,
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long aStride, gfxImageFormat aFormat);
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/**
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* See the parameters to the matching constructor. This should only
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* be called once, in the constructor, which has already set mSize
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* and mFormat.
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*/
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void AllocateAndInit(long aStride, int32_t aMinimalAllocation, bool aClear);
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void InitFromSurface(cairo_surface_t *csurf);
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long ComputeStride() const {
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if (mSize.height < 0 || mSize.width < 0) {
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return 0;
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}
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return ComputeStride(mSize, mFormat);
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}
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void MakeInvalid();
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mozilla::gfx::IntSize 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 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 mozilla::gfx::IntSize& aSize,
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gfxImageFormat aFormat);
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private:
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RefPtr<gfxImageSurface> mParent;
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};
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#endif /* GFX_IMAGESURFACE_H */
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