зеркало из https://github.com/mozilla/gecko-dev.git
139 строки
5.6 KiB
C
139 строки
5.6 KiB
C
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Communicator client code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef _GIF_H_
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#define _GIF_H_
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#define MAX_LZW_BITS 12
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#define MAX_BITS 4097 /* 2^MAX_LZW_BITS+1 */
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#define MAX_COLORS 256
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#define MAX_HOLD_SIZE 256
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enum { GIF_TRAILER = 0x3B }; //';'
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enum { GIF_IMAGE_SEPARATOR = 0x2C }; //','
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enum { GIF_EXTENSION_INTRODUCER = 0x21 }; //'!'
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enum { GIF_GRAPHIC_CONTROL_LABEL = 0xF9 };
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enum { GIF_COMMENT_LABEL = 0xFE };
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enum { GIF_PLAIN_TEXT_LABEL = 0x01 };
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enum { GIF_APPLICATION_EXTENSION_LABEL = 0xFF };
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/* gif2.h
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The interface for the GIF87/89a decoder.
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*/
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// List of possible parsing states
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typedef enum {
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gif_type,
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gif_global_header,
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gif_global_colormap,
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gif_image_start,
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gif_image_header,
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gif_image_colormap,
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gif_image_body,
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gif_lzw_start,
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gif_lzw,
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gif_sub_block,
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gif_extension,
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gif_control_extension,
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gif_consume_block,
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gif_skip_block,
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gif_done,
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gif_error,
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gif_comment_extension,
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gif_application_extension,
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gif_netscape_extension_block,
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gif_consume_netscape_extension,
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gif_consume_comment
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} gstate;
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/* A GIF decoder's state */
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typedef struct gif_struct {
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/* Parsing state machine */
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gstate state; /* Curent decoder master state */
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PRUint32 bytes_to_consume; /* Number of bytes to accumulate */
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PRUint32 bytes_in_hold; /* bytes accumulated so far*/
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/* LZW decoder state machine */
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PRUint8 *stackp; /* Current stack pointer */
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int datasize;
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int codesize;
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int codemask;
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int avail; /* Index of next available slot in dictionary */
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int oldcode;
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PRUint8 firstchar;
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int count; /* Remaining # bytes in sub-block */
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int bits; /* Number of unread bits in "datum" */
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int32 datum; /* 32-bit input buffer */
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/* Output state machine */
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int ipass; /* Interlace pass; Ranges 1-4 if interlaced. */
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PRUintn rows_remaining; /* Rows remaining to be output */
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PRUintn irow; /* Current output row, starting at zero */
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PRUint8 *rowp; /* Current output pointer */
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/* Parameters for image frame currently being decoded*/
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PRUintn x_offset, y_offset; /* With respect to "screen" origin */
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PRUintn height, width;
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int tpixel; /* Index of transparent pixel */
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PRInt32 disposal_method; /* Restore to background, leave in place, etc.*/
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PRUint32 *local_colormap; /* Per-image colormap */
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int local_colormap_size; /* Size of local colormap array. */
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PRUint32 delay_time; /* Display time, in milliseconds,
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for this image in a multi-image GIF */
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/* Global (multi-image) state */
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int version; /* Either 89 for GIF89 or 87 for GIF87 */
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PRUintn screen_width; /* Logical screen width & height */
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PRUintn screen_height;
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PRUint32 global_colormap_depth; /* Depth of global colormap array. */
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int images_decoded; /* Counts images for multi-part GIFs */
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int loop_count; /* Netscape specific extension block to control
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the number of animation loops a GIF renders. */
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bool progressive_display; /* If TRUE, do Haeberli interlace hack */
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bool interlaced; /* TRUE, if scanlines arrive interlaced order */
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bool is_transparent; /* TRUE, if tpixel is valid */
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PRUint16 prefix[MAX_BITS]; /* LZW decoding tables */
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PRUint8 hold[MAX_HOLD_SIZE]; /* Accumulation buffer */
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PRUint32 global_colormap[MAX_COLORS]; /* Default colormap if local not supplied */
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PRUint8 suffix[MAX_BITS]; /* LZW decoding tables */
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PRUint8 stack[MAX_BITS]; /* Base of LZW decoder stack */
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} gif_struct;
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#endif
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