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Diffstat (limited to 'image/encoders/bmp/nsBMPEncoder.h')
| -rw-r--r-- | image/encoders/bmp/nsBMPEncoder.h | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/image/encoders/bmp/nsBMPEncoder.h b/image/encoders/bmp/nsBMPEncoder.h new file mode 100644 index 0000000000..1f40d9df34 --- /dev/null +++ b/image/encoders/bmp/nsBMPEncoder.h @@ -0,0 +1,150 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef mozilla_image_encoders_bmp_nsBMPEncoder_h +#define mozilla_image_encoders_bmp_nsBMPEncoder_h + +#include "mozilla/Attributes.h" +#include "mozilla/ReentrantMonitor.h" +#include "mozilla/UniquePtr.h" + +#include "imgIEncoder.h" + +#include "nsCOMPtr.h" + +#define NS_BMPENCODER_CID \ + { /* 13a5320c-4c91-4FA4-bd16-b081a3ba8c0b */ \ + 0x13a5320c, 0x4c91, 0x4fa4, { \ + 0xbd, 0x16, 0xb0, 0x81, 0xa3, 0Xba, 0x8c, 0x0b \ + } \ + } + +namespace mozilla { +namespace image { +namespace bmp { + +struct FileHeader { + char signature[2]; // String "BM". + uint32_t filesize; // File size. + int32_t reserved; // Zero. + uint32_t dataoffset; // Offset to raster data. +}; + +struct XYZ { + int32_t x, y, z; +}; + +struct XYZTriple { + XYZ r, g, b; +}; + +struct V5InfoHeader { + uint32_t bihsize; // Header size + int32_t width; // Uint16 in OS/2 BMPs + int32_t height; // Uint16 in OS/2 BMPs + uint16_t planes; // =1 + uint16_t bpp; // Bits per pixel. + uint32_t compression; // See Compression for valid values + uint32_t image_size; // (compressed) image size. Can be 0 if + // compression==0 + uint32_t xppm; // Pixels per meter, horizontal + uint32_t yppm; // Pixels per meter, vertical + uint32_t colors; // Used Colors + uint32_t important_colors; // Number of important colors. 0=all + // The rest of the header is not available in WIN_V3 BMP Files + uint32_t red_mask; // Bits used for red component + uint32_t green_mask; // Bits used for green component + uint32_t blue_mask; // Bits used for blue component + uint32_t alpha_mask; // Bits used for alpha component + uint32_t color_space; // 0x73524742=LCS_sRGB ... + // These members are unused unless color_space == LCS_CALIBRATED_RGB + XYZTriple white_point; // Logical white point + uint32_t gamma_red; // Red gamma component + uint32_t gamma_green; // Green gamma component + uint32_t gamma_blue; // Blue gamma component + uint32_t intent; // Rendering intent + // These members are unused unless color_space == LCS_PROFILE_* + uint32_t profile_offset; // Offset to profile data in bytes + uint32_t profile_size; // Size of profile data in bytes + uint32_t reserved; // =0 + + static const uint32_t COLOR_SPACE_LCS_SRGB = 0x73524742; +}; + +} // namespace bmp +} // namespace image +} // namespace mozilla + +// Provides BMP encoding functionality. Use InitFromData() to do the +// encoding. See that function definition for encoding options. + +class nsBMPEncoder final : public imgIEncoder { + typedef mozilla::ReentrantMonitor ReentrantMonitor; + + public: + NS_DECL_THREADSAFE_ISUPPORTS + NS_DECL_IMGIENCODER + NS_DECL_NSIINPUTSTREAM + NS_DECL_NSIASYNCINPUTSTREAM + + nsBMPEncoder(); + + protected: + ~nsBMPEncoder(); + + enum Version { VERSION_3 = 3, VERSION_5 = 5 }; + + // See InitData in the cpp for valid parse options + nsresult ParseOptions(const nsAString& aOptions, Version& aVersionOut, + uint16_t& aBppOut); + // Obtains data with no alpha in machine-independent byte order + void ConvertHostARGBRow(const uint8_t* aSrc, + const mozilla::UniquePtr<uint8_t[]>& aDest, + uint32_t aPixelWidth); + // Thread safe notify listener + void NotifyListener(); + + // Initializes the bitmap file header member mBMPFileHeader + nsresult InitFileHeader(Version aVersion, uint16_t aBPP, uint32_t aWidth, + uint32_t aHeight); + // Initializes the bitmap info header member mBMPInfoHeader + nsresult InitInfoHeader(Version aVersion, uint16_t aBPP, uint32_t aWidth, + uint32_t aHeight); + + // Encodes the bitmap file header member mBMPFileHeader + void EncodeFileHeader(); + // Encodes the bitmap info header member mBMPInfoHeader + void EncodeInfoHeader(); + // Encodes a row of image data which does not have alpha data + void EncodeImageDataRow24(const uint8_t* aData); + // Encodes a row of image data which does have alpha data + void EncodeImageDataRow32(const uint8_t* aData); + // Obtains the current offset filled up to for the image buffer + inline int32_t GetCurrentImageBufferOffset() { + return static_cast<int32_t>(mImageBufferCurr - mImageBufferStart); + } + + // These headers will always contain endian independent stuff + // They store the BMP headers which will be encoded + mozilla::image::bmp::FileHeader mBMPFileHeader; + mozilla::image::bmp::V5InfoHeader mBMPInfoHeader; + + // Keeps track of the start of the image buffer + uint8_t* mImageBufferStart; + // Keeps track of the current position in the image buffer + uint8_t* mImageBufferCurr; + // Keeps track of the image buffer size + uint32_t mImageBufferSize; + // Keeps track of the number of bytes in the image buffer which are read + uint32_t mImageBufferReadPoint; + // Stores true if the image is done being encoded + bool mFinished; + + nsCOMPtr<nsIInputStreamCallback> mCallback; + nsCOMPtr<nsIEventTarget> mCallbackTarget; + uint32_t mNotifyThreshold; +}; + +#endif // mozilla_image_encoders_bmp_nsBMPEncoder_h |