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comparison: gfx/thebes/gfxImageSurface.h
gfx/thebes/gfxImageSurface.h
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| 1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- | |
| 2 * This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #ifndef GFX_IMAGESURFACE_H | |
| 7 #define GFX_IMAGESURFACE_H | |
| 8 | |
| 9 #include "mozilla/MemoryReporting.h" | |
| 10 #include "mozilla/RefPtr.h" | |
| 11 #include "gfxASurface.h" | |
| 12 #include "nsAutoPtr.h" | |
| 13 #include "nsSize.h" | |
| 14 | |
| 15 // ARGB -- raw buffer.. wont be changed.. good for storing data. | |
| 16 | |
| 17 class gfxSubimageSurface; | |
| 18 | |
| 19 namespace mozilla { | |
| 20 namespace gfx { | |
| 21 class DataSourceSurface; | |
| 22 class SourceSurface; | |
| 23 } | |
| 24 } | |
| 25 | |
| 26 /** | |
| 27 * A raw image buffer. The format can be set in the constructor. Its main | |
| 28 * purpose is for storing read-only images and using it as a source surface, | |
| 29 * but it can also be drawn to. | |
| 30 */ | |
| 31 class gfxImageSurface : public gfxASurface { | |
| 32 public: | |
| 33 /** | |
| 34 * Construct an image surface around an existing buffer of image data. | |
| 35 * @param aData A buffer containing the image data | |
| 36 * @param aSize The size of the buffer | |
| 37 * @param aStride The stride of the buffer | |
| 38 * @param format Format of the data | |
| 39 * | |
| 40 * @see gfxImageFormat | |
| 41 */ | |
| 42 gfxImageSurface(unsigned char *aData, const gfxIntSize& aSize, | |
| 43 long aStride, gfxImageFormat aFormat); | |
| 44 | |
| 45 /** | |
| 46 * Construct an image surface. | |
| 47 * @param aSize The size of the buffer | |
| 48 * @param format Format of the data | |
| 49 * | |
| 50 * @see gfxImageFormat | |
| 51 */ | |
| 52 gfxImageSurface(const gfxIntSize& size, gfxImageFormat format, bool aClear = true); | |
| 53 | |
| 54 /** | |
| 55 * Construct an image surface, with a specified stride and allowing the | |
| 56 * allocation of more memory than required for the storage of the surface | |
| 57 * itself. When aStride and aMinimalAllocation are <=0, this constructor | |
| 58 * is the equivalent of the preceeding one. | |
| 59 * | |
| 60 * @param format Format of the data | |
| 61 * @param aSize The size of the buffer | |
| 62 * @param aStride The stride of the buffer - if <=0, use ComputeStride() | |
| 63 * @param aMinimalAllocation Allocate at least this many bytes. If smaller | |
| 64 * than width * stride, or width*stride <=0, this value is ignored. | |
| 65 * @param aClear | |
| 66 * | |
| 67 * @see gfxImageFormat | |
| 68 */ | |
| 69 gfxImageSurface(const gfxIntSize& aSize, gfxImageFormat aFormat, | |
| 70 long aStride, int32_t aMinimalAllocation, bool aClear); | |
| 71 | |
| 72 gfxImageSurface(cairo_surface_t *csurf); | |
| 73 | |
| 74 virtual ~gfxImageSurface(); | |
| 75 | |
| 76 // ImageSurface methods | |
| 77 gfxImageFormat Format() const { return mFormat; } | |
| 78 | |
| 79 virtual const gfxIntSize GetSize() const { return mSize; } | |
| 80 int32_t Width() const { return mSize.width; } | |
| 81 int32_t Height() const { return mSize.height; } | |
| 82 | |
| 83 /** | |
| 84 * Distance in bytes between the start of a line and the start of the | |
| 85 * next line. | |
| 86 */ | |
| 87 int32_t Stride() const { return mStride; } | |
| 88 /** | |
| 89 * Returns a pointer for the image data. Users of this function can | |
| 90 * write to it, but must not attempt to free the buffer. | |
| 91 */ | |
| 92 unsigned char* Data() const { return mData; } // delete this data under us and die. | |
| 93 /** | |
| 94 * Returns the total size of the image data. | |
| 95 */ | |
| 96 int32_t GetDataSize() const { return mStride*mSize.height; } | |
| 97 | |
| 98 /* Fast copy from another image surface; returns TRUE if successful, FALSE otherwise */ | |
| 99 bool CopyFrom (gfxImageSurface *other); | |
| 100 | |
| 101 /** | |
| 102 * Fast copy from a source surface; returns TRUE if successful, FALSE otherwise | |
| 103 * Assumes that the format of this surface is compatable with aSurface | |
| 104 */ | |
| 105 bool CopyFrom (mozilla::gfx::SourceSurface *aSurface); | |
| 106 | |
| 107 /** | |
| 108 * Fast copy to a source surface; returns TRUE if successful, FALSE otherwise | |
| 109 * Assumes that the format of this surface is compatible with aSurface | |
| 110 */ | |
| 111 bool CopyTo (mozilla::gfx::SourceSurface *aSurface); | |
| 112 | |
| 113 /** | |
| 114 * Copy to a Moz2D DataSourceSurface. | |
| 115 * Marked as virtual so that browsercomps can access this method. | |
| 116 */ | |
| 117 virtual mozilla::TemporaryRef<mozilla::gfx::DataSourceSurface> CopyToB8G8R8A8DataSourceSurface(); | |
| 118 | |
| 119 /* return new Subimage with pointing to original image starting from aRect.pos | |
| 120 * and size of aRect.size. New subimage keeping current image reference | |
| 121 */ | |
| 122 already_AddRefed<gfxSubimageSurface> GetSubimage(const gfxRect& aRect); | |
| 123 | |
| 124 virtual already_AddRefed<gfxImageSurface> GetAsImageSurface(); | |
| 125 | |
| 126 /** See gfxASurface.h. */ | |
| 127 virtual void MovePixels(const nsIntRect& aSourceRect, | |
| 128 const nsIntPoint& aDestTopLeft) MOZ_OVERRIDE; | |
| 129 | |
| 130 static long ComputeStride(const gfxIntSize&, gfxImageFormat); | |
| 131 | |
| 132 virtual size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const | |
| 133 MOZ_OVERRIDE; | |
| 134 virtual size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const | |
| 135 MOZ_OVERRIDE; | |
| 136 virtual bool SizeOfIsMeasured() const MOZ_OVERRIDE; | |
| 137 | |
| 138 protected: | |
| 139 gfxImageSurface(); | |
| 140 void InitWithData(unsigned char *aData, const gfxIntSize& aSize, | |
| 141 long aStride, gfxImageFormat aFormat); | |
| 142 /** | |
| 143 * See the parameters to the matching constructor. This should only | |
| 144 * be called once, in the constructor, which has already set mSize | |
| 145 * and mFormat. | |
| 146 */ | |
| 147 void AllocateAndInit(long aStride, int32_t aMinimalAllocation, bool aClear); | |
| 148 void InitFromSurface(cairo_surface_t *csurf); | |
| 149 | |
| 150 long ComputeStride() const { return ComputeStride(mSize, mFormat); } | |
| 151 | |
| 152 | |
| 153 void MakeInvalid(); | |
| 154 | |
| 155 gfxIntSize mSize; | |
| 156 bool mOwnsData; | |
| 157 unsigned char *mData; | |
| 158 gfxImageFormat mFormat; | |
| 159 long mStride; | |
| 160 }; | |
| 161 | |
| 162 class gfxSubimageSurface : public gfxImageSurface { | |
| 163 protected: | |
| 164 friend class gfxImageSurface; | |
| 165 gfxSubimageSurface(gfxImageSurface* aParent, | |
| 166 unsigned char* aData, | |
| 167 const gfxIntSize& aSize, | |
| 168 gfxImageFormat aFormat); | |
| 169 private: | |
| 170 nsRefPtr<gfxImageSurface> mParent; | |
| 171 }; | |
| 172 | |
| 173 #endif /* GFX_IMAGESURFACE_H */ |
