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Document location of image format specifications

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This commit is contained in:
Adrian Johnson 2008-11-24 22:38:30 +10:30
parent 4ca644af27
commit 70e4c53272
1 changed files with 15 additions and 0 deletions
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15
src/cairo-image-info.c
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@ -42,6 +42,11 @@ _get_be32 (const unsigned char *p)
return p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3];
}
/* JPEG (image/jpeg)
*
* http://www.w3.org/Graphics/JPEG/itu-t81.pdf
*/
/* Markers with no parameters. All other markers are followed by a two
* byte length of the parameters. */
#define TEM 0x01
@ -146,6 +151,11 @@ _cairo_image_info_get_jpeg_info (cairo_image_info_t *info,
return CAIRO_STATUS_SUCCESS;
}
/* JPEG 2000 (image/jp2)
*
* http://www.jpeg.org/public/15444-1annexi.pdf
*/
#define JPX_FILETYPE 0x66747970
#define JPX_JP2_HEADER 0x6A703268
#define JPX_IMAGE_HEADER 0x69686472
@ -240,6 +250,11 @@ _cairo_image_info_get_jpx_info (cairo_image_info_t *info,
return CAIRO_STATUS_SUCCESS;
}
/* PNG (image/png)
*
* http://www.w3.org/TR/2003/REC-PNG-20031110/
*/
#define PNG_IHDR 0x49484452
static const unsigned char _png_magic[8] = { 137, 80, 78, 71, 13, 10, 26, 10 };