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82 lines
2.0 KiB
C++
82 lines
2.0 KiB
C++
/* 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 mozilla_image_ICOFileHeaders_h
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#define mozilla_image_ICOFileHeaders_h
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namespace mozilla {
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namespace image {
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#define ICONFILEHEADERSIZE 6
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#define ICODIRENTRYSIZE 16
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#define PNGSIGNATURESIZE 8
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#define BMPFILEHEADERSIZE 14
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/**
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* The header that comes right at the start of an icon file. (This
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* corresponds to the Windows ICONDIR structure.)
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*/
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struct IconFileHeader
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{
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/**
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* Must be set to 0;
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*/
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uint16_t mReserved;
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/**
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* 1 for icon (.ICO) image (or 2 for cursor (.CUR) image (icon with the
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* addition of a hotspot), but we don't support cursor).
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*/
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uint16_t mType;
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/**
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* The number of BMP/PNG images contained in the icon file.
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*/
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uint16_t mCount;
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};
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/**
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* For each BMP/PNG image that the icon file contains there must be a
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* corresponding icon dir entry. (This corresponds to the Windows
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* ICONDIRENTRY structure.) These entries are encoded directly after the
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* IconFileHeader.
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*/
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struct IconDirEntry
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{
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uint8_t mWidth;
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uint8_t mHeight;
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/**
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* The number of colors in the color palette of the BMP/PNG that this dir
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* entry corresponds to, or 0 if the image does not use a color palette.
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*/
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uint8_t mColorCount;
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/**
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* Should be set to 0.
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*/
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uint8_t mReserved;
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union {
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uint16_t mPlanes; // ICO
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uint16_t mXHotspot; // CUR
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};
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union {
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uint16_t mBitCount; // ICO (bits per pixel)
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uint16_t mYHotspot; // CUR
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};
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/**
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* "bytes in resource" is the length of the encoded BMP/PNG that this dir
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* entry corresponds to.
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*/
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uint32_t mBytesInRes;
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/**
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* The offset of the start of the encoded BMP/PNG that this dir entry
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* corresponds to (from the start of the icon file).
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*/
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uint32_t mImageOffset;
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};
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} // namespace image
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} // namespace mozilla
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#endif // mozilla_image_ICOFileHeaders_h
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