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