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comparison: gfx/layers/ImageDataSerializer.cpp
gfx/layers/ImageDataSerializer.cpp
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| 1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- | |
| 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 #include "ImageDataSerializer.h" | |
| 7 #include "gfx2DGlue.h" // for SurfaceFormatToImageFormat | |
| 8 #include "gfxImageSurface.h" // for gfxImageSurface | |
| 9 #include "gfxPoint.h" // for gfxIntSize | |
| 10 #include "mozilla/Assertions.h" // for MOZ_ASSERT, etc | |
| 11 #include "mozilla/gfx/2D.h" // for DataSourceSurface, Factory | |
| 12 #include "mozilla/gfx/Tools.h" // for GetAlignedStride, etc | |
| 13 #include "mozilla/mozalloc.h" // for operator delete, etc | |
| 14 | |
| 15 namespace mozilla { | |
| 16 namespace layers { | |
| 17 | |
| 18 using namespace gfx; | |
| 19 | |
| 20 // The Data is layed out as follows: | |
| 21 // | |
| 22 // +-------------------+ -++ --+ <-- ImageDataSerializerBase::mData pointer | |
| 23 // | SurfaceBufferInfo | | | | |
| 24 // +-------------------+ --+ | offset | |
| 25 // | ... | | | |
| 26 // +-------------------+ ------+ | |
| 27 // | | | |
| 28 // | data | | |
| 29 // | | | |
| 30 // +-------------------+ | |
| 31 | |
| 32 // Structure written at the beginning of the data blob containing the image | |
| 33 // (as shown in the figure above). It contains the necessary informations to | |
| 34 // read the image in the blob. | |
| 35 namespace { | |
| 36 struct SurfaceBufferInfo | |
| 37 { | |
| 38 uint32_t width; | |
| 39 uint32_t height; | |
| 40 SurfaceFormat format; | |
| 41 | |
| 42 static uint32_t GetOffset() | |
| 43 { | |
| 44 return GetAlignedStride<16>(sizeof(SurfaceBufferInfo)); | |
| 45 } | |
| 46 }; | |
| 47 } // anonymous namespace | |
| 48 | |
| 49 static SurfaceBufferInfo* | |
| 50 GetBufferInfo(uint8_t* aData, size_t aDataSize) | |
| 51 { | |
| 52 return aDataSize >= sizeof(SurfaceBufferInfo) | |
| 53 ? reinterpret_cast<SurfaceBufferInfo*>(aData) | |
| 54 : nullptr; | |
| 55 } | |
| 56 | |
| 57 void | |
| 58 ImageDataSerializer::InitializeBufferInfo(IntSize aSize, | |
| 59 SurfaceFormat aFormat) | |
| 60 { | |
| 61 SurfaceBufferInfo* info = GetBufferInfo(mData, mDataSize); | |
| 62 MOZ_ASSERT(info); // OK to assert here, this method is client-side-only | |
| 63 info->width = aSize.width; | |
| 64 info->height = aSize.height; | |
| 65 info->format = aFormat; | |
| 66 Validate(); | |
| 67 } | |
| 68 | |
| 69 static inline uint32_t | |
| 70 ComputeStride(SurfaceFormat aFormat, uint32_t aWidth) | |
| 71 { | |
| 72 return GetAlignedStride<4>(BytesPerPixel(aFormat) * aWidth); | |
| 73 } | |
| 74 | |
| 75 uint32_t | |
| 76 ImageDataSerializerBase::ComputeMinBufferSize(IntSize aSize, | |
| 77 SurfaceFormat aFormat) | |
| 78 { | |
| 79 uint32_t bufsize = aSize.height * ComputeStride(aFormat, aSize.width); | |
| 80 return SurfaceBufferInfo::GetOffset() | |
| 81 + GetAlignedStride<16>(bufsize); | |
| 82 } | |
| 83 | |
| 84 void | |
| 85 ImageDataSerializerBase::Validate() | |
| 86 { | |
| 87 mIsValid = false; | |
| 88 if (!mData) { | |
| 89 return; | |
| 90 } | |
| 91 SurfaceBufferInfo* info = GetBufferInfo(mData, mDataSize); | |
| 92 if (!info) { | |
| 93 return; | |
| 94 } | |
| 95 size_t requiredSize = | |
| 96 ComputeMinBufferSize(IntSize(info->width, info->height), info->format); | |
| 97 mIsValid = requiredSize <= mDataSize; | |
| 98 } | |
| 99 | |
| 100 uint8_t* | |
| 101 ImageDataSerializerBase::GetData() | |
| 102 { | |
| 103 MOZ_ASSERT(IsValid()); | |
| 104 return mData + SurfaceBufferInfo::GetOffset(); | |
| 105 } | |
| 106 | |
| 107 uint32_t | |
| 108 ImageDataSerializerBase::GetStride() const | |
| 109 { | |
| 110 MOZ_ASSERT(IsValid()); | |
| 111 SurfaceBufferInfo* info = GetBufferInfo(mData, mDataSize); | |
| 112 return ComputeStride(GetFormat(), info->width); | |
| 113 } | |
| 114 | |
| 115 IntSize | |
| 116 ImageDataSerializerBase::GetSize() const | |
| 117 { | |
| 118 MOZ_ASSERT(IsValid()); | |
| 119 SurfaceBufferInfo* info = GetBufferInfo(mData, mDataSize); | |
| 120 return IntSize(info->width, info->height); | |
| 121 } | |
| 122 | |
| 123 SurfaceFormat | |
| 124 ImageDataSerializerBase::GetFormat() const | |
| 125 { | |
| 126 MOZ_ASSERT(IsValid()); | |
| 127 return GetBufferInfo(mData, mDataSize)->format; | |
| 128 } | |
| 129 | |
| 130 TemporaryRef<gfxImageSurface> | |
| 131 ImageDataSerializerBase::GetAsThebesSurface() | |
| 132 { | |
| 133 MOZ_ASSERT(IsValid()); | |
| 134 IntSize size = GetSize(); | |
| 135 return new gfxImageSurface(GetData(), | |
| 136 gfxIntSize(size.width, size.height), | |
| 137 GetStride(), | |
| 138 SurfaceFormatToImageFormat(GetFormat())); | |
| 139 } | |
| 140 | |
| 141 TemporaryRef<DrawTarget> | |
| 142 ImageDataSerializerBase::GetAsDrawTarget(gfx::BackendType aBackend) | |
| 143 { | |
| 144 MOZ_ASSERT(IsValid()); | |
| 145 return gfx::Factory::CreateDrawTargetForData(aBackend, | |
| 146 GetData(), GetSize(), | |
| 147 GetStride(), GetFormat()); | |
| 148 } | |
| 149 | |
| 150 TemporaryRef<gfx::DataSourceSurface> | |
| 151 ImageDataSerializerBase::GetAsSurface() | |
| 152 { | |
| 153 MOZ_ASSERT(IsValid()); | |
| 154 return Factory::CreateWrappingDataSourceSurface(GetData(), | |
| 155 GetStride(), | |
| 156 GetSize(), | |
| 157 GetFormat()); | |
| 158 } | |
| 159 | |
| 160 } // namespace layers | |
| 161 } // namespace mozilla |
