зеркало из https://github.com/mozilla/gecko-dev.git
1683 строки
52 KiB
C++
1683 строки
52 KiB
C++
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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/* -*- Mode: C; tab-width: 4 -*-
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* gif.c --- GIF87 & GIF89 Image decoder
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*/
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/*
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The Graphics Interchange Format(c) is the copyright property of CompuServe
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Incorporated. Only CompuServe Incorporated is authorized to define, redefine,
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enhance, alter, modify or change in any way the definition of the format.
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CompuServe Incorporated hereby grants a limited, non-exclusive, royalty-free
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license for the use of the Graphics Interchange Format(sm) in computer
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software; computer software utilizing GIF(sm) must acknowledge ownership of the
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Graphics Interchange Format and its Service Mark by CompuServe Incorporated, in
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User and Technical Documentation. Computer software utilizing GIF, which is
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distributed or may be distributed without User or Technical Documentation must
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display to the screen or printer a message acknowledging ownership of the
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Graphics Interchange Format and the Service Mark by CompuServe Incorporated; in
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this case, the acknowledgement may be displayed in an opening screen or leading
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banner, or a closing screen or trailing banner. A message such as the following
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may be used:
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"The Graphics Interchange Format(c) is the Copyright property of
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CompuServe Incorporated. GIF(sm) is a Service Mark property of
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CompuServe Incorporated."
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For further information, please contact :
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CompuServe Incorporated
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Graphics Technology Department
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5000 Arlington Center Boulevard
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Columbus, Ohio 43220
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U. S. A.
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CompuServe Incorporated maintains a mailing list with all those individuals and
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organizations who wish to receive copies of this document when it is corrected
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or revised. This service is offered free of charge; please provide us with your
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mailing address.
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*/
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#include "nsIImgDecoder.h"
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#include "il.h"
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#include "prmem.h"
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#include "merrors.h"
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#include "nsCRT.h"
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#include "gif.h"
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#include "nsIImgDCallbk.h"
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#include "ilISystemServices.h"
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#define HOWMANY(x, r) (((x) + ((r) - 1)) / (r))
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#define ROUNDUP(x, r) (HOWMANY(x, r) * (r))
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int il_debug;
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PRLogModuleInfo *il_log_module = NULL;
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#ifndef MAX
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# define MAX(x, y) (((x) > (y)) ? (x) : (y))
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#endif
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PR_BEGIN_EXTERN_C
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extern int MK_OUT_OF_MEMORY;
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PR_END_EXTERN_C
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/* List of possible parsing states */
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typedef enum {
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gif_gather,
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gif_init, /*1*/
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gif_type,
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gif_version,
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gif_global_header,
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gif_global_colormap,
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gif_image_start, /*6*/
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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, /*11*/
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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, /*17*/
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gif_oom,
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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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gif_delay,
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gif_wait_for_buffer_full
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} gstate;
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/* "Disposal" method indicates how the image should be handled in the
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framebuffer before the subsequent image is displayed. */
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typedef enum
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{
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DISPOSE_NOT_SPECIFIED = 0,
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DISPOSE_KEEP = 1, /* Leave it in the framebuffer */
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DISPOSE_OVERWRITE_BGCOLOR = 2, /* Overwrite with background color */
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DISPOSE_OVERWRITE_PREVIOUS = 4 /* Save-under */
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} gdispose;
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#define MAX_HOLD 768 /* for now must be big enough for a cmap */
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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 MINIMUM_DELAY_TIME 10
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/* A GIF decoder */
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typedef struct
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gif_struct {
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/* Parsing state machine */
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gstate state; /* Curent decoder master state */
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PRUint8 *hold; /* Accumulation buffer */
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int32 hold_size; /* Capacity, in bytes, of accumulation buffer */
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PRUint8 *gather_head; /* Next byte to read in accumulation buffer */
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int32 gather_request_size; /* Number of bytes to accumulate */
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int32 gathered; /* bytes accumulated so far*/
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gstate post_gather_state; /* State after requested bytes accumulated */
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int32 requested_buffer_fullness; /* For netscape application extension */
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/* LZW decoder state machine */
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PRUint8 *stack; /* Base of decoder stack */
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PRUint8 *stackp; /* Current stack pointer */
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PRUint16 *prefix;
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PRUint8 *suffix;
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int datasize;
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int codesize;
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int codemask;
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int clear_code; /* Codeword used to trigger dictionary reset */
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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 *rgbrow; /* Temporary storage for dithering/mapping */
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PRUint8 *rowbuf; /* Single scanline temporary buffer */
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PRUint8 *rowend; /* Pointer to end of rowbuf */
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PRUint8 *rowp; /* Current output pointer */
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/* Image parameters */
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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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PRUintn last_x_offset, last_y_offset; /* With respect to "screen" origin */
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PRUintn last_height, last_width;
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int interlaced; /* TRUE, if scanlines arrive interlaced order */
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int tpixel; /* Index of transparent pixel */
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int is_transparent; /* TRUE, if tpixel is valid */
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int control_extension; /* TRUE, if image control extension present */
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int is_local_colormap_defined;
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gdispose disposal_method; /* Restore to background, leave in place, etc.*/
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gdispose last_disposal_method;
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IL_RGB *local_colormap; /* Per-image colormap */
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int local_colormap_size; /* Size of local colormap array. */
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int progressive_display; /* If TRUE, do Haeberli interlace hack */
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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 screen_bgcolor; /* Logical screen background color */
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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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IL_RGB *global_colormap; /* Default colormap if local not supplied */
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int global_colormap_size; /* Size of global colormap array. */
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int images_decoded; /* Counts images for multi-part GIFs */
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il_container *ic; /* Back pointer to requesting image_container */
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void *delay_timeout; /* Used to delay after displaying picture */
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int destroy_pending; /* Stream has ended */
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} gif_struct;
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/* Gather n characters from the input stream and then enter state s. */
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#define GETN(n,s) \
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do {gs->state=gif_gather; gs->gather_request_size = (n); \
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gs->post_gather_state = s;} while (0)
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/* Get a 16-bit value stored in little-endian format */
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#define GETINT16(p) ((p)[1]<<8|(p)[0])
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/* Get a 32-bit value stored in little-endian format */
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#define GETINT32(p) (((p)[3]<<24) | ((p)[2]<<16) | ((p)[1]<<8) | ((p)[0]))
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/* binary block Allocate and Concatenate
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*
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* destination_length is the length of the existing block
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* source_length is the length of the block being added to the
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* destination block
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*/
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char *
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il_BACat (char **destination,
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size_t destination_length,
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const char *source,
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size_t source_length)
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{
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if (source)
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{
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if (*destination)
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{
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*destination = (char *) PR_REALLOC (*destination, destination_length + source_length);
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if (*destination == NULL)
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return(NULL);
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nsCRT::memmove(*destination + destination_length, source, source_length);
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}
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else
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{
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*destination = (char *) PR_MALLOC (source_length);
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if (*destination == NULL)
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return(NULL);
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nsCRT::memcpy(*destination, source, source_length);
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}
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}
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return *destination;
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}
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#undef BlockAllocCat
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#define BlockAllocCat(dest, dest_length, src, src_length) il_BACat(&(dest), dest_length, src, src_length)
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/* Send the data to the display front-end. */
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static void
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output_row(gif_struct *gs)
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{
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int width, drow_start, drow_end;
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drow_start = drow_end = gs->irow;
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/*
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* Haeberli-inspired hack for interlaced GIFs: Replicate lines while
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* displaying to diminish the "venetian-blind" effect as the image is
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* loaded. Adjust pixel vertical positions to avoid the appearance of the
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* image crawling up the screen as successive passes are drawn.
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*/
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if (gs->progressive_display && gs->interlaced && (gs->ipass < 4))
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{
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PRUintn row_dup=0, row_shift=0;
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switch (gs->ipass) {
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case 1:
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row_dup = 7;
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row_shift = 3;
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break;
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case 2:
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row_dup = 3;
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row_shift = 1;
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break;
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case 3:
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row_dup = 1;
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row_shift = 0;
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break;
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default:
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ILTRACE(0,("Illegal interlace pass"));
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break;
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}
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drow_start -= row_shift;
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drow_end = drow_start + row_dup;
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/* Extend if bottom edge isn't covered because of the shift upward. */
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if (((gs->height - 1) - drow_end) <= row_shift)
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drow_end = gs->height - 1;
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/* Clamp first and last rows to upper and lower edge of image. */
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if (drow_start < 0)
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drow_start = 0;
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if ((PRUintn)drow_end >= gs->height)
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drow_end = gs->height - 1;
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}
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/* Check for scanline below edge of logical screen */
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if ((gs->y_offset + gs->irow) < gs->screen_height) {
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il_draw_mode draw_mode;
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if (gs->images_decoded >= 1)
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draw_mode = ilOverlay;
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else
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draw_mode = ilErase;
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/* Clip if right edge of image exceeds limits */
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if ((gs->x_offset + gs->width) > gs->screen_width)
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width = gs->screen_width - gs->x_offset;
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else
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width = gs->width;
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if (width > 0)
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if(gs->ic->imgdcb)
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gs->ic->imgdcb->ImgDCBHaveRow(gs->rowbuf, gs->rgbrow,
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gs->x_offset, width, gs->y_offset + drow_start,
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drow_end - drow_start + 1, draw_mode, gs->ipass);
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}
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gs->rowp = gs->rowbuf;
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if(!gs->interlaced)
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{
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gs->irow++;
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}
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else
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{
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do{
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switch(gs->ipass)
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{
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case 1:
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gs->irow += 8;
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if(gs->irow >= gs->height)
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{
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gs->ipass++;
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gs->irow = 4;
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}
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break;
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case 2:
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gs->irow += 8;
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if(gs->irow >= gs->height)
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{
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gs->ipass++;
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gs->irow = 2;
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}
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break;
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case 3:
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gs->irow += 4;
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if(gs->irow >= gs->height)
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{
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gs->ipass++;
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gs->irow = 1;
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}
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break;
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case 4:
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gs->irow += 2;
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if(gs->irow >= gs->height){
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gs->ipass++;
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gs->irow = 0;
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}
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break;
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default:
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PR_ASSERT(0);
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}
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}while(gs->irow > gs->height - 1);
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}
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}
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/* Perform Lempel-Ziv-Welch decoding */
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static int
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do_lzw(gif_struct *gs, const PRUint8 *q)
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{
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int code;
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int incode;
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const PRUint8 *ch;
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/* Copy all the decoder state variables into locals so the compiler
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* won't worry about them being aliased. The locals will be homed
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* back into the GIF decoder structure when we exit.
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*/
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int avail = gs->avail;
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int bits = gs->bits;
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int codesize = gs->codesize;
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int codemask = gs->codemask;
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int count = gs->count;
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int oldcode = gs->oldcode;
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int clear_code = gs->clear_code;
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PRUint8 firstchar = gs->firstchar;
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int32 datum = gs->datum;
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PRUint16 *prefix = gs->prefix;
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PRUint8 *stackp = gs->stackp;
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PRUint8 *suffix = gs->suffix;
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PRUint8 *stack = gs->stack;
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PRUint8 *rowp = gs->rowp;
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PRUint8 *rowend = gs->rowend;
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PRUintn rows_remaining = gs->rows_remaining;
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#define OUTPUT_ROW(gs) \
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{ \
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output_row(gs); \
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rows_remaining--; \
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rowp = gs->rowp; \
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if (!rows_remaining) \
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goto END; \
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}
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for (ch=q; count-- > 0; ch++)
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{
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/* Feed the next byte into the decoder's 32-bit input buffer. */
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datum += ((int32) *ch) << bits;
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bits += 8;
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/* Check for underflow of decoder's 32-bit input buffer. */
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while (bits >= codesize)
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{
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/* Get the leading variable-length symbol from the data stream */
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code = datum & codemask;
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datum >>= codesize;
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bits -= codesize;
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/* Reset the dictionary to its original state, if requested */
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if (code == clear_code)
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{
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codesize = gs->datasize + 1;
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codemask = (1 << codesize) - 1;
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avail = clear_code + 2;
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oldcode = -1;
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continue;
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}
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/* Check for explicit end-of-stream code */
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if (code == (clear_code + 1))
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return 0;
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if (oldcode == -1)
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{
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*rowp++ = suffix[code];
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if (rowp == rowend) {
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OUTPUT_ROW(gs);
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}
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firstchar = oldcode = code;
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continue;
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}
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/* Check for a code not defined in the dictionary yet. */
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if (code > avail)
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{
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ILTRACE(3,("il:gif: code too large %d %d", code, avail));
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return -1;
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}
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incode = code;
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if (code == avail)
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{
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/* the first code is always < avail */
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*stackp++ = firstchar;
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code = oldcode;
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}
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while(code > clear_code)
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{
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if(code == prefix[code])
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return -1;
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*stackp++ = suffix[code];
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code = prefix[code];
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}
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/* Define a new codeword in the dictionary. */
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*stackp++ = firstchar = suffix[code];
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prefix[avail] = oldcode;
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suffix[avail] = firstchar;
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avail++;
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if(avail >= MAX_BITS)
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return -1;
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/* If we've used up all the codewords of a given length
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* increase the length of codewords by one bit, but don't
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* exceed the specified maximum codeword size of 12 bits.
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*/
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if (((avail & codemask) == 0) && (avail < 4096))
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{
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codesize++;
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codemask += avail;
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}
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oldcode = incode;
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/* Copy the decoded data out to the scanline buffer. */
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do {
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*rowp++ = *--stackp;
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if (rowp == rowend) {
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OUTPUT_ROW(gs);
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}
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} while (stackp > stack);
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}
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}
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END:
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/* Home the local copies of the GIF decoder state variables */
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gs->avail = avail;
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gs->bits = bits;
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gs->codesize = codesize;
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gs->codemask = codemask;
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gs->count = count;
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gs->oldcode = oldcode;
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gs->firstchar = firstchar;
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gs->datum = datum;
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gs->stackp = stackp;
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gs->rowp = rowp;
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gs->rows_remaining = rows_remaining;
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return 0;
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}
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/*
|
|
* setup an ic for gif decoding
|
|
*/
|
|
PRBool
|
|
il_gif_init(il_container *ic)
|
|
{
|
|
gif_struct *gs;
|
|
NI_ColorSpace *src_color_space = ic->src_header->color_space;
|
|
|
|
gs = PR_NEWZAP(gif_struct);
|
|
if (gs)
|
|
{
|
|
ic->ds = gs;
|
|
gs->state = gif_init;
|
|
gs->post_gather_state = gif_error;
|
|
gs->gathered = 0;
|
|
gs->ic = ic;
|
|
}
|
|
|
|
/* Initialize the container's source image header. */
|
|
src_color_space->type = NI_PseudoColor;
|
|
src_color_space->pixmap_depth = 8;
|
|
src_color_space->bit_alloc.index_depth = 8;
|
|
|
|
return (gs != 0);
|
|
}
|
|
|
|
static int
|
|
il_gif_init_transparency(il_container *ic, int index)
|
|
{
|
|
IL_IRGB *src_trans_pixel = ic->src_header->transparent_pixel;
|
|
IL_IRGB *img_trans_pixel;
|
|
|
|
if (!src_trans_pixel) {
|
|
src_trans_pixel = PR_NEWZAP(IL_IRGB);
|
|
if (!src_trans_pixel)
|
|
return FALSE;
|
|
ic->src_header->transparent_pixel = src_trans_pixel;
|
|
|
|
/* Initialize the destination image's transparent pixel. */
|
|
if(ic->imgdcb)
|
|
ic->imgdcb->ImgDCBInitTransparentPixel();
|
|
|
|
/* Set the source image's transparent pixel color to be the preferred
|
|
transparency color of the destination image. */
|
|
img_trans_pixel = ic->image->header.transparent_pixel;
|
|
src_trans_pixel->red = img_trans_pixel->red;
|
|
src_trans_pixel->green = img_trans_pixel->green;
|
|
src_trans_pixel->blue = img_trans_pixel->blue;
|
|
}
|
|
|
|
/* Set the source image's transparent pixel index. Do this even if the source
|
|
image's transparent pixel has previously been set, since the index can vary
|
|
from frame to frame in an animated gif. */
|
|
src_trans_pixel->index = index;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
static void
|
|
il_gif_destroy_transparency(il_container *ic)
|
|
{
|
|
NI_PixmapHeader *src_header = ic->src_header;
|
|
|
|
if (src_header->transparent_pixel) {
|
|
/* Destroy the source image's transparent pixel. */
|
|
PR_FREEIF(src_header->transparent_pixel);
|
|
src_header->transparent_pixel = NULL;
|
|
|
|
/* Destroy the destination image's transparent pixel. */
|
|
if(ic->imgdcb)
|
|
ic->imgdcb->ImgDCBDestroyTransparentPixel();
|
|
}
|
|
}
|
|
|
|
|
|
int
|
|
il_gif_compute_percentage_complete(int row, il_container *ic)
|
|
{
|
|
PRUintn percent_height;
|
|
int percent_done = 0;
|
|
|
|
percent_height = (PRUintn)(row * (PRUint32)100 / ic->image->header.height);
|
|
switch(ic->pass) {
|
|
case 0: percent_done = percent_height; /* non-interlaced GIF */
|
|
break;
|
|
case 1: percent_done = percent_height / 8;
|
|
break;
|
|
case 2: percent_done = 12 + percent_height / 8;
|
|
break;
|
|
case 3: percent_done = 25 + percent_height / 4;
|
|
break;
|
|
case 4: percent_done = 50 + percent_height / 2;
|
|
break;
|
|
default:
|
|
ILTRACE(0,("Illegal interlace pass"));
|
|
break;
|
|
}
|
|
|
|
return percent_done;
|
|
}
|
|
|
|
/* Maximum # of bytes to read ahead while waiting for delay_time to expire.
|
|
We no longer limit this number to remain within WIN16 malloc limitations
|
|
of 0xffff */
|
|
|
|
#define MAX_READ_AHEAD (0xFFFFFFL)
|
|
|
|
PRUint8
|
|
il_gif_write_ready(il_container *ic)
|
|
{
|
|
gif_struct *gs = (gif_struct *)ic->ds;
|
|
int32 max;
|
|
|
|
if (!gs)
|
|
return 1; /* Let imglib generic code decide */
|
|
|
|
max = MAX(MAX_READ_AHEAD, gs->requested_buffer_fullness);
|
|
if (gs->gathered < max)
|
|
return 1; /* Let imglib generic code decide */
|
|
else
|
|
return 0; /* No more data until timeout expires */
|
|
}
|
|
|
|
|
|
static void
|
|
process_buffered_gif_input_data(gif_struct* gs)
|
|
{
|
|
gstate state;
|
|
il_container *ic = gs->ic;
|
|
PRUint8 err = 0;
|
|
|
|
/* Force any data we've buffered up to be processed. */
|
|
err = il_gif_write(ic, (PRUint8 *) "", 0);
|
|
|
|
/* The stream has already finished delivering data and the stream
|
|
completion routine has been called sometime in the past. Now that
|
|
we're actually done handling all of that data, call the stream
|
|
completion routine again, but this time for real. */
|
|
state = gs->state;
|
|
|
|
if(ic->state==IC_ABORT_PENDING)
|
|
state = gif_error;
|
|
|
|
/* test, stop loopers if error */
|
|
if( state == gif_error){
|
|
ic->loop_count = 0;
|
|
gs->destroy_pending =TRUE;
|
|
ic->state = IC_ABORT_PENDING;
|
|
}
|
|
if (gs->destroy_pending &&
|
|
((state == gif_done) || (state == gif_error) || (state == gif_oom))) {
|
|
|
|
|
|
il_gif_abort(ic);
|
|
if(ic->imgdcb)
|
|
ic->imgdcb->ImgDCBHaveImageAll();
|
|
}
|
|
}
|
|
|
|
void
|
|
gif_delay_time_callback(void *closure)
|
|
{
|
|
il_container *ic = (il_container*)closure;
|
|
gif_struct *gs = NULL;
|
|
|
|
if((ic)&&(ic->ds))
|
|
gs = (gif_struct *)ic->ds;
|
|
else
|
|
return; //error
|
|
|
|
|
|
PR_ASSERT(gs->state == gif_delay);
|
|
gs->delay_timeout = NULL;
|
|
|
|
if(gs->ic){
|
|
if(gs->ic->type == NULL)
|
|
gs->ic->type = nsCRT::strdup("image/gif"); //mime string
|
|
}
|
|
else
|
|
return; //error
|
|
|
|
if (gs->ic->state == IC_ABORT_PENDING)
|
|
return;
|
|
|
|
gs->delay_time = 0; /* Reset for next image */
|
|
|
|
if (gs->state == gif_delay) {
|
|
GETN(1, gif_image_start);
|
|
process_buffered_gif_input_data(gs);
|
|
}
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* For the first images in the sequence clear the logical
|
|
* screen to the background color, unless the first image
|
|
* completely covers the logical screen, in which case
|
|
* it's unnecessary. XXX - This can be optimized.
|
|
*/
|
|
|
|
static int
|
|
gif_clear_screen(gif_struct *gs)
|
|
{
|
|
PRUintn erase_width=0, erase_height=0, erase_x_offset=0, erase_y_offset=0;
|
|
PRBool erase;
|
|
il_container *ic = gs->ic;
|
|
|
|
erase = PR_FALSE;
|
|
if (gs->images_decoded == 0)
|
|
{
|
|
if ((gs->width != gs->screen_width) ||
|
|
(gs->height != gs->screen_height) ||
|
|
gs->is_transparent)
|
|
{
|
|
erase = PR_TRUE;
|
|
erase_width = gs->screen_width;
|
|
erase_height = gs->screen_height;
|
|
erase_x_offset = erase_y_offset = 0;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (gs->last_disposal_method == DISPOSE_OVERWRITE_BGCOLOR)
|
|
{
|
|
erase = PR_TRUE;
|
|
erase_width = gs->last_width;
|
|
erase_height = gs->last_height;
|
|
erase_x_offset = gs->last_x_offset;
|
|
erase_y_offset = gs->last_y_offset;
|
|
}
|
|
}
|
|
|
|
gs->last_disposal_method = gs->disposal_method;
|
|
gs->last_width = gs->width;
|
|
gs->last_height = gs->height;
|
|
gs->last_x_offset = gs->x_offset;
|
|
gs->last_y_offset = gs->y_offset;
|
|
|
|
if (erase)
|
|
{
|
|
PRUintn i;
|
|
int src_trans_pixel_index;
|
|
PRUint8 *rowbuf = gs->rowbuf;
|
|
NI_PixmapHeader *src_header = ic->src_header;
|
|
IL_IRGB *saved_src_trans_pixel, *saved_img_trans_pixel;
|
|
|
|
/* Catch images that fall outside the logical screen. */
|
|
if ((erase_x_offset + erase_width) > gs->screen_width)
|
|
erase_width = gs->screen_width - erase_x_offset;
|
|
|
|
/* We have to temporarily pretend the image is transparent
|
|
so we can clear using the context's background color. */
|
|
saved_img_trans_pixel = ic->image->header.transparent_pixel;
|
|
saved_src_trans_pixel = src_header->transparent_pixel;
|
|
src_header->transparent_pixel = NULL;
|
|
ic->image->header.transparent_pixel = NULL;
|
|
|
|
/* Pick an index for the source image's temporary transparent pixel.
|
|
The actual choice is immaterial since it will only be used for
|
|
the clear screen operation. */
|
|
|
|
src_trans_pixel_index = 0;
|
|
if (!il_gif_init_transparency(ic, src_trans_pixel_index))
|
|
return MK_OUT_OF_MEMORY;
|
|
|
|
/* Now fill in the row buffer. */
|
|
for (i = 0; i < erase_width; i++)
|
|
rowbuf[i] = src_trans_pixel_index;
|
|
|
|
/* Note: We deliberately lie about the interlace
|
|
pass number so that calls to il_flush_image_data()
|
|
are done using a timer. */
|
|
if (erase_width > 0)
|
|
if(gs->ic->imgdcb)
|
|
gs->ic->imgdcb->ImgDCBHaveRow(gs->rowbuf, gs->rgbrow,
|
|
erase_x_offset, erase_width,
|
|
erase_y_offset,erase_height, ilErase, 2);
|
|
|
|
/* Reset the source image's transparent pixel to its former state. */
|
|
il_gif_destroy_transparency(ic);
|
|
src_header->transparent_pixel = saved_src_trans_pixel;
|
|
ic->image->header.transparent_pixel = saved_img_trans_pixel;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* process data arriving from the stream for the gif decoder
|
|
*/
|
|
|
|
int
|
|
il_gif_write(il_container *ic, const PRUint8 *buf, int32 len)
|
|
{
|
|
int status;
|
|
gif_struct *gs = (gif_struct *)ic->ds;
|
|
NI_PixmapHeader *src_header = ic->src_header;
|
|
NI_ColorMap *cmap = &src_header->color_space->cmap;
|
|
const PRUint8 *q, *p=buf,*ep=buf+len;
|
|
|
|
|
|
/* If this assert fires, chances are the netlib flubbed and
|
|
continued to send data after the image stream was closed. */
|
|
PR_ASSERT(gs);
|
|
if (!gs) {
|
|
#ifdef DEBUG
|
|
ILTRACE(1,("Netlib Error - imagelib image stream is closed\n"));
|
|
#endif
|
|
return MK_IMAGE_LOSSAGE;
|
|
}
|
|
|
|
/* If this assert fires, some upstream data provider ignored the
|
|
zero return value from il_gif_write_ready() which says not to
|
|
send any more data to this stream until the delay timeout fires. */
|
|
// PR_ASSERT ((len == 0) || (gs->gathered < MAX_READ_AHEAD));
|
|
if (!((len == 0) || (gs->gathered < MAX_READ_AHEAD)))
|
|
return MK_INTERRUPTED;
|
|
|
|
q = NULL; /* Initialize to shut up gcc warnings */
|
|
|
|
while (p <= ep)
|
|
{
|
|
ILTRACE(9,("il:gif: state %d len %d buf %u p %u q %u ep %u",
|
|
gs->state,len,buf,p,q,ep));
|
|
switch(gs->state)
|
|
{
|
|
case gif_lzw:
|
|
if (do_lzw(gs, q) < 0)
|
|
{
|
|
gs->state=gif_error;
|
|
break;
|
|
}
|
|
GETN(1,gif_sub_block);
|
|
break;
|
|
|
|
case gif_lzw_start:
|
|
{
|
|
int i;
|
|
|
|
cmap->map = gs->is_local_colormap_defined ?
|
|
gs->local_colormap : gs->global_colormap;
|
|
|
|
PR_ASSERT(cmap->map);
|
|
if (!cmap->map)
|
|
return MK_IMAGE_LOSSAGE;
|
|
|
|
/* Now we know how many colors are in our colormap. */
|
|
if (gs->is_local_colormap_defined || (gs->images_decoded == 0)){
|
|
if(ic->imgdcb){
|
|
nsresult rv = ic->imgdcb->ImgDCBSetupColorspaceConverter();
|
|
if(NS_FAILED(rv))
|
|
return MK_IMAGE_LOSSAGE;
|
|
}
|
|
}
|
|
/* Initialize LZW parser/decoder */
|
|
gs->datasize = *q;
|
|
if(gs->datasize > MAX_LZW_BITS)
|
|
{
|
|
gs->state=gif_error;
|
|
break;
|
|
}
|
|
|
|
gs->clear_code = 1 << gs->datasize;
|
|
gs->avail = gs->clear_code + 2;
|
|
gs->oldcode = -1;
|
|
gs->codesize = gs->datasize + 1;
|
|
gs->codemask = (1 << gs->codesize) - 1;
|
|
|
|
gs->datum = gs->bits = 0;
|
|
|
|
if (!gs->prefix)
|
|
gs->prefix = (PRUint16 *)PR_Calloc(sizeof(PRUint16), MAX_BITS);
|
|
if (!gs->suffix)
|
|
gs->suffix = ( PRUint8 *)PR_Calloc(sizeof(PRUint8), MAX_BITS);
|
|
if (!gs->stack)
|
|
gs->stack = ( PRUint8 *)PR_Calloc(sizeof(PRUint8), MAX_BITS);
|
|
|
|
if( !gs->prefix || !gs->suffix || !gs->stack)
|
|
{
|
|
/* complete from abort will free prefix & suffix */
|
|
ILTRACE(0,("il:gif: MEM stack"));
|
|
gs->state=gif_oom;
|
|
break;
|
|
}
|
|
|
|
if(gs->clear_code >= MAX_BITS)
|
|
{
|
|
gs->state=gif_error;
|
|
break;
|
|
}
|
|
|
|
/* init the tables */
|
|
for (i=0; i < gs->clear_code; i++)
|
|
gs->suffix[i] = i;
|
|
|
|
gs->stackp = gs->stack;
|
|
|
|
GETN(1,gif_sub_block);
|
|
}
|
|
break;
|
|
|
|
/* We're positioned at the very start of the file. */
|
|
case gif_init:
|
|
{
|
|
GETN(3,gif_type);
|
|
break;
|
|
}
|
|
|
|
/* All GIF files begin with "GIF87a" or "GIF89a" */
|
|
case gif_type:
|
|
{
|
|
if (strncmp((char*)q,"GIF",3))
|
|
{
|
|
ILTRACE(2,("il:gif: not a GIF file"));
|
|
gs->state=gif_error;
|
|
break;
|
|
}
|
|
GETN(3,gif_version);
|
|
}
|
|
break;
|
|
|
|
case gif_version:
|
|
{
|
|
if(!strncmp((char*)q,"89a",3))
|
|
{
|
|
gs->version=89;
|
|
}
|
|
else
|
|
{
|
|
if(!strncmp((char*)q,"87a",3))
|
|
{
|
|
gs->version=87;
|
|
}
|
|
else
|
|
{
|
|
ILTRACE(2,("il:gif: unrecognized GIF version number"));
|
|
gs->state=gif_error;
|
|
break;
|
|
}
|
|
}
|
|
ILTRACE(2,("il:gif: %d gif", gs->version));
|
|
GETN(7,gif_global_header);
|
|
}
|
|
break;
|
|
|
|
case gif_global_header:
|
|
{
|
|
/* This is the height and width of the "screen" or
|
|
* frame into which images are rendered. The
|
|
* individual images can be smaller than the
|
|
* screen size and located with an origin anywhere
|
|
* within the screen.
|
|
*/
|
|
|
|
gs->screen_width = GETINT16(q);
|
|
gs->screen_height = GETINT16(q+2);
|
|
|
|
gs->screen_bgcolor = q[5];
|
|
|
|
gs->global_colormap_size = 2<<(q[4]&0x07);
|
|
|
|
/* A -ve value for cmap->num_colors indicates that the colors may
|
|
be non-unique.*/
|
|
cmap->num_colors = -gs->global_colormap_size;
|
|
cmap->map = NULL;
|
|
|
|
if(q[6])
|
|
{
|
|
/* should assert gif89 */
|
|
if(q[6] != 49)
|
|
{
|
|
#ifdef DEBUG
|
|
float aspect = (float)((q[6] + 15) / 64.0);
|
|
ILTRACE(2, ("il:gif: %f aspect ratio", aspect));
|
|
#endif
|
|
}
|
|
}
|
|
|
|
if( q[4] & 0x80 ) /* global map */
|
|
{
|
|
GETN(gs->global_colormap_size*3, gif_global_colormap);
|
|
}
|
|
else
|
|
{
|
|
GETN(1, gif_image_start);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case gif_global_colormap:
|
|
{
|
|
IL_RGB* map;
|
|
int i;
|
|
|
|
if(!(map = (IL_RGB*)PR_Calloc(gs->global_colormap_size,
|
|
sizeof(IL_RGB))))
|
|
{
|
|
ILTRACE(0,("il:gif: MEM map"));
|
|
gs->state=gif_oom;
|
|
break;
|
|
}
|
|
|
|
if(ic->imgdcb)
|
|
ic->imgdcb->ImgDCBResetPalette();
|
|
gs->global_colormap = map;
|
|
|
|
#ifndef M12N /* Fix me. */
|
|
#ifdef XP_MAC
|
|
im->hasUniqueColormap = 1;
|
|
#endif
|
|
#endif /* M12N */
|
|
for (i=0; i < gs->global_colormap_size; i++, map++)
|
|
{
|
|
map->red = *q++;
|
|
map->green = *q++;
|
|
map->blue = *q++;
|
|
}
|
|
|
|
GETN(1,gif_image_start);
|
|
}
|
|
break;
|
|
|
|
case gif_image_start:
|
|
{
|
|
if(*q==';') /* terminator */
|
|
{
|
|
gs->state = gif_done;
|
|
break;
|
|
}
|
|
|
|
if(*q=='!') /* extension */
|
|
{
|
|
GETN(2,gif_extension);
|
|
break;
|
|
}
|
|
|
|
if(*q!=',') /* invalid start character */
|
|
{
|
|
ILTRACE(2,("il:gif: bogus start character 0x%02x",
|
|
(int)*q));
|
|
gs->state=gif_error;
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
/* If this is a multi-part GIF, flush the last image */
|
|
if (gs->images_decoded) {
|
|
ic->multi++; /* Avoid progressive display */
|
|
}
|
|
|
|
GETN(9, gif_image_header);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case gif_extension:
|
|
{
|
|
int len = gs->count = q[1];
|
|
gstate es = gif_skip_block;
|
|
|
|
ILTRACE(2,("il:gif: %d byte extension %x", len, (int)*q));
|
|
switch(*q)
|
|
{
|
|
case 0xf9:
|
|
es = gif_control_extension;
|
|
break;
|
|
|
|
case 0x01:
|
|
ILTRACE(2,("il:gif: ignoring plain text extension"));
|
|
break;
|
|
|
|
case 0xff:
|
|
es = gif_application_extension;
|
|
break;
|
|
|
|
case 0xfe:
|
|
es = gif_consume_comment;
|
|
break;
|
|
}
|
|
|
|
if (len)
|
|
GETN(len, es);
|
|
else
|
|
GETN(1, gif_image_start);
|
|
}
|
|
break;
|
|
|
|
case gif_consume_block:
|
|
{
|
|
if(!*q)
|
|
{
|
|
GETN(1, gif_image_start);
|
|
}
|
|
else
|
|
{
|
|
GETN(*q, gif_skip_block);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case gif_skip_block:
|
|
GETN(1, gif_consume_block);
|
|
break;
|
|
|
|
case gif_control_extension:
|
|
{
|
|
if(*q & 0x1)
|
|
{
|
|
gs->tpixel = *(q+3);
|
|
ILTRACE(2,("il:gif: transparent pixel %d", gs->tpixel));
|
|
if (!il_gif_init_transparency(ic, gs->tpixel))
|
|
return MK_OUT_OF_MEMORY;
|
|
gs->is_transparent = TRUE;
|
|
}
|
|
else
|
|
{
|
|
ILTRACE(2,("il:gif: ignoring gfx control extension"));
|
|
}
|
|
gs->control_extension = TRUE;
|
|
gs->disposal_method = (gdispose)(((*q) >> 2) & 0x7);
|
|
gs->delay_time = GETINT16(q + 1) * 10;
|
|
GETN(1,gif_consume_block);
|
|
}
|
|
break;
|
|
|
|
case gif_comment_extension:
|
|
{
|
|
gs->count = *q;
|
|
if (gs->count)
|
|
GETN(gs->count, gif_consume_comment);
|
|
else
|
|
GETN(1, gif_image_start);
|
|
}
|
|
break;
|
|
|
|
case gif_consume_comment:
|
|
{
|
|
BlockAllocCat(ic->comment, ic->comment_length, (char*)q, gs->count);
|
|
ic->comment_length += gs->count;
|
|
BlockAllocCat(ic->comment, ic->comment_length, "", 1);
|
|
ic->comment_length++;
|
|
GETN(1, gif_comment_extension);
|
|
}
|
|
break;
|
|
|
|
case gif_application_extension:
|
|
/* Check for netscape application extension */
|
|
if (!strncmp((char*)q, "NETSCAPE2.0", 11) ||
|
|
!strncmp((char*)q, "ANIMEXTS1.0", 11))
|
|
GETN(1, gif_netscape_extension_block);
|
|
else
|
|
GETN(1, gif_consume_block);
|
|
break;
|
|
|
|
/* Netscape-specific GIF extension: animation looping */
|
|
case gif_netscape_extension_block:
|
|
if (*q)
|
|
GETN(*q, gif_consume_netscape_extension);
|
|
else
|
|
GETN(1, gif_image_start);
|
|
break;
|
|
|
|
/* Parse netscape-specific application extensions */
|
|
case gif_consume_netscape_extension:
|
|
{
|
|
int netscape_extension = q[0] & 7;
|
|
|
|
/* Loop entire animation specified # of times. Only read the
|
|
loop count during the first iteration. */
|
|
if (netscape_extension == 1) {
|
|
if (!ic->is_looping) {
|
|
ic->loop_count = GETINT16(q + 1);
|
|
|
|
/* Zero loop count is infinite animation loop request */
|
|
if (ic->loop_count == 0)
|
|
ic->loop_count = -1;
|
|
|
|
/* Tell the front end that the stop state might have changed */
|
|
/* because of the looping GIF. */
|
|
#ifndef M12N /* XXXM12N Fix me. */
|
|
if (ic->net_cx)
|
|
FE_UpdateStopState(ic->net_cx);
|
|
#endif /* M12N */
|
|
}
|
|
|
|
GETN(1, gif_netscape_extension_block);
|
|
}
|
|
|
|
/* Wait for specified # of bytes to enter buffer */
|
|
else if (netscape_extension == 2)
|
|
{
|
|
gs->requested_buffer_fullness = GETINT32(q + 1);
|
|
GETN(gs->requested_buffer_fullness, gif_wait_for_buffer_full);
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
case gif_wait_for_buffer_full:
|
|
gs->gathered = gs->requested_buffer_fullness;
|
|
GETN(1, gif_netscape_extension_block);
|
|
break;
|
|
|
|
case gif_image_header:
|
|
{
|
|
PRUintn height, width;
|
|
|
|
/* Get image offsets, with respect to the screen origin */
|
|
gs->x_offset = GETINT16(q);
|
|
gs->y_offset = GETINT16(q + 2);
|
|
|
|
/* Get image width and height. */
|
|
width = GETINT16(q + 4);
|
|
height = GETINT16(q + 6);
|
|
|
|
ILTRACE(2,("il:gif: screen %dx%d, image %dx%d",
|
|
gs->screen_width, gs->screen_height, width, height));
|
|
|
|
/* Work around broken GIF files where the logical screen
|
|
* size has weird width or height. We assume that GIF87a
|
|
* files don't contain animations.
|
|
*/
|
|
if ((gs->images_decoded == 0) &&
|
|
((gs->screen_height < height) || (gs->screen_width < width) ||
|
|
(gs->version == 87))){
|
|
gs->screen_height = height;
|
|
gs->screen_width = width;
|
|
gs->x_offset = 0;
|
|
gs->y_offset = 0;
|
|
}
|
|
/* Work around more broken GIF files that have zero image
|
|
width or height */
|
|
if (!height || !width)
|
|
{
|
|
height = gs->screen_height;
|
|
width = gs->screen_width;
|
|
}
|
|
|
|
gs->height = height;
|
|
gs->width = width;
|
|
|
|
/* This case will never be taken if this is the first image */
|
|
/* being decoded. If any of the later images are larger */
|
|
/* than the screen size, we need to reallocate buffers. */
|
|
if (gs->screen_width < width) {
|
|
|
|
gs->rgbrow = (PRUint8*)PR_REALLOC(gs->rgbrow, 3 * width);
|
|
gs->rowbuf = (PRUint8*)PR_REALLOC(gs->rowbuf, width);
|
|
|
|
if((!gs->rgbrow)||(!gs->rowbuf)){
|
|
gs->state = gif_oom;
|
|
break;
|
|
}
|
|
|
|
gs->screen_width = width;
|
|
if(gs->screen_height < gs->height )
|
|
gs->screen_height = gs->height;
|
|
|
|
ic->src_header->width = gs->width;
|
|
ic->src_header->height = gs->height;
|
|
ic->image->header.width = gs->width;
|
|
ic->image->header.height = gs->height;
|
|
ic->image->header.widthBytes = (ic->image->header.width * ic->image->header.color_space->pixmap_depth + 7)/8;
|
|
|
|
ic->image->header.widthBytes = ROUNDUP(ic->image->header.widthBytes, 4);
|
|
|
|
if(ic->imgdcb){
|
|
nsresult rv = ic->imgdcb->ImgDCBImageSize();
|
|
|
|
if(NS_FAILED(rv)){
|
|
gs->state = gif_error;
|
|
break;
|
|
}
|
|
}
|
|
else{ //no callback is an error too.
|
|
gs->state = gif_error;
|
|
break;
|
|
}
|
|
|
|
ic->img_cx->img_cb->NewPixmap(ic->img_cx->dpy_cx, ic->dest_width,
|
|
ic->dest_height, ic->image, ic->mask);
|
|
|
|
if((!ic->scalerow)||(!ic->image->bits)||(ic->mask && !ic->mask->bits)){
|
|
gs->state=gif_oom;
|
|
break;
|
|
}
|
|
}
|
|
else{
|
|
if (!gs->rgbrow)
|
|
gs->rgbrow = (PRUint8*)PR_MALLOC(3 * gs->screen_width);
|
|
|
|
if (!gs->rowbuf)
|
|
gs->rowbuf = (PRUint8*)PR_MALLOC(gs->screen_width);
|
|
}
|
|
|
|
if (!gs->rowbuf || !gs->rgbrow)
|
|
{
|
|
ILTRACE(0,("il:gif: MEM row"));
|
|
gs->state=gif_oom;
|
|
break;
|
|
}
|
|
|
|
/* Free transparency from earlier image in multi-image sequence. */
|
|
if (!gs->is_transparent && src_header->transparent_pixel) {
|
|
il_gif_destroy_transparency(ic);
|
|
}
|
|
|
|
if (gs->images_decoded == 0) {
|
|
src_header->width = gs->screen_width;
|
|
src_header->height = gs->screen_height;
|
|
|
|
if(ic->imgdcb){
|
|
nsresult rv = ic->imgdcb->ImgDCBImageSize();
|
|
|
|
if(NS_FAILED(rv)){
|
|
gs->state = gif_error;
|
|
break;
|
|
}
|
|
}
|
|
else{ //no callback is an error too.
|
|
gs->state = gif_error;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if ( *(q+8) & 0x40 )
|
|
{
|
|
ILTRACE(2,("il:gif: interlaced"));
|
|
gs->interlaced = TRUE;
|
|
gs->ipass = 1;
|
|
} else {
|
|
gs->interlaced = FALSE;
|
|
gs->ipass = 0;
|
|
}
|
|
|
|
if (gs->images_decoded == 0)
|
|
{
|
|
gs->progressive_display = ic->img_cx->progressive_display;
|
|
} else {
|
|
|
|
/* Overlaying interlaced, transparent GIFs over
|
|
existing image data using the Haeberli display hack
|
|
requires saving the underlying image in order to
|
|
avoid jaggies at the transparency edges. We are
|
|
unprepared to deal with that, so don't display such
|
|
images progressively */
|
|
gs->progressive_display = ic->img_cx->progressive_display &&
|
|
!(gs->interlaced && gs->is_transparent);
|
|
}
|
|
|
|
status = gif_clear_screen(gs);
|
|
if (status < 0)
|
|
return status;
|
|
|
|
/* Clear state from last image */
|
|
gs->requested_buffer_fullness = 0;
|
|
gs->control_extension = FALSE;
|
|
gs->is_transparent = FALSE;
|
|
gs->irow = 0;
|
|
gs->rows_remaining = gs->height;
|
|
gs->rowend = gs->rowbuf + gs->width;
|
|
gs->rowp = gs->rowbuf;
|
|
|
|
/* bits per pixel is 1<<((q[8]&0x07)+1); */
|
|
|
|
if ( *(q+8) & 0x80 )
|
|
{
|
|
int num_colors = 2 << (*(q + 8) & 0x7);
|
|
|
|
if ((num_colors > gs->local_colormap_size) &&
|
|
gs->local_colormap)
|
|
{
|
|
PR_FREEIF(gs->local_colormap);
|
|
gs->local_colormap = NULL;
|
|
}
|
|
gs->local_colormap_size = num_colors;
|
|
/* A -ve value for cmap->num_colors indicates that the colors
|
|
may be non-unique. */
|
|
cmap->num_colors = -num_colors;
|
|
|
|
/* Switch to the new local palette after it loads */
|
|
if(ic->imgdcb)
|
|
ic->imgdcb->ImgDCBResetPalette();
|
|
|
|
gs->is_local_colormap_defined = TRUE;
|
|
GETN(gs->local_colormap_size * 3, gif_image_colormap);
|
|
}
|
|
else
|
|
{
|
|
/* Switch back to the global palette */
|
|
if (gs->is_local_colormap_defined)
|
|
if(ic->imgdcb)
|
|
ic->imgdcb->ImgDCBResetPalette();
|
|
|
|
gs->is_local_colormap_defined = FALSE;
|
|
GETN(1, gif_lzw_start);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case gif_image_colormap:
|
|
{
|
|
IL_RGB* map;
|
|
int i;
|
|
|
|
ILTRACE(2,("il:gif: local colormap"));
|
|
|
|
map = gs->local_colormap;
|
|
if (!map)
|
|
{
|
|
map = gs->local_colormap = (IL_RGB*)PR_Calloc(
|
|
gs->local_colormap_size, sizeof(IL_RGB));
|
|
|
|
if(!map)
|
|
{
|
|
ILTRACE(0,("il:gif: MEM map"));
|
|
gs->state=gif_oom;
|
|
break;
|
|
}
|
|
}
|
|
|
|
#ifndef M12N /* Fix me */
|
|
#ifdef XP_MAC
|
|
im->hasUniqueColormap = 1;
|
|
#endif
|
|
#endif /* M12N */
|
|
|
|
for (i=0; i < gs->local_colormap_size; i++, map++)
|
|
{
|
|
map->red = *q++;
|
|
map->green = *q++;
|
|
map->blue = *q++;
|
|
}
|
|
|
|
GETN(1,gif_lzw_start);
|
|
}
|
|
break;
|
|
|
|
case gif_sub_block:
|
|
{
|
|
if ((gs->count = *q) != 0)
|
|
/* Still working on the same image: Process next LZW data block */
|
|
{
|
|
/* Make sure there are still rows left. If the GIF data */
|
|
/* is corrupt, we may not get an explicit terminator. */
|
|
if (gs->rows_remaining == 0) {
|
|
ILTRACE(3,("il:gif: missing image terminator, continuing"));
|
|
/* This is an illegal GIF, but we remain tolerant. */
|
|
#ifdef DONT_TOLERATE_BROKEN_GIFS
|
|
gs->state=gif_error;
|
|
break;
|
|
#else
|
|
GETN(1,gif_sub_block);
|
|
#endif
|
|
}
|
|
GETN(gs->count, gif_lzw);
|
|
}
|
|
else
|
|
/* See if there are any more images in this sequence. */
|
|
{
|
|
/* Flush the image data unconditionally, so that we can
|
|
notify observers that the current frame has completed. */
|
|
if(ic->imgdcb){
|
|
ic->imgdcb->ImgDCBFlushImage();
|
|
ic->imgdcb->ImgDCBHaveImageFrame();
|
|
}
|
|
gs->images_decoded++;
|
|
|
|
/* An image can specify a delay time before which to display
|
|
subsequent images. Block until the appointed time. */
|
|
if(gs->delay_time < MINIMUM_DELAY_TIME )
|
|
gs->delay_time = MINIMUM_DELAY_TIME;
|
|
if (gs->delay_time){
|
|
if(ic->imgdcb){
|
|
gs->delay_timeout = (void *)
|
|
ic->imgdcb->ImgDCBSetTimeout(gif_delay_time_callback, gs->ic, gs->delay_time);
|
|
}
|
|
/* Essentially, tell the decoder state machine to wait
|
|
forever. The timeout callback routine will wake up the
|
|
state machine and force it to decode the next image. */
|
|
GETN(1L<<30, gif_image_start);
|
|
gs->state = gif_delay;
|
|
} else {
|
|
GETN(1, gif_image_start);
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
|
|
case gif_done:
|
|
return 0;
|
|
break;
|
|
|
|
case gif_delay:
|
|
case gif_gather:
|
|
{
|
|
int32 gather_remaining;
|
|
int32 request_size = gs->gather_request_size;
|
|
|
|
{
|
|
gather_remaining = request_size - gs->gathered;
|
|
|
|
/* Do we already have enough data in the accumulation
|
|
buffer to satisfy the request ? (This can happen
|
|
after we transition from the gif_delay state.) */
|
|
if (gather_remaining <= 0)
|
|
{
|
|
gs->gathered -= request_size;
|
|
q = gs->gather_head;
|
|
gs->gather_head += request_size;
|
|
gs->state = gs->post_gather_state;
|
|
break;
|
|
}
|
|
|
|
/* Shift remaining data to the head of the buffer */
|
|
if (gs->gathered && (gs->gather_head != gs->hold)) {
|
|
nsCRT::memmove(gs->hold, gs->gather_head, gs->gathered);
|
|
gs->gather_head = gs->hold;
|
|
}
|
|
|
|
/* If we add the data just handed to us by the netlib
|
|
to what we've already gathered, is there enough to satisfy
|
|
the current request ? */
|
|
if ((ep - p) >= gather_remaining)
|
|
{
|
|
if(gs->gathered)
|
|
{ /* finish a prior gather */
|
|
char *hold = (char*)gs->hold;
|
|
BlockAllocCat(hold, gs->gathered, (char*)p, gather_remaining);
|
|
gs->hold = (PRUint8*)hold;
|
|
q = gs->gather_head = gs->hold;
|
|
gs->gathered = 0;
|
|
}
|
|
else
|
|
{
|
|
q = p;
|
|
}
|
|
p += gather_remaining;
|
|
gs->state = gs->post_gather_state;
|
|
}
|
|
else
|
|
{
|
|
char *hold = (char*)gs->hold;
|
|
BlockAllocCat(hold, gs->gathered, (char*)p, ep - p);
|
|
gs->hold = (PRUint8*)hold;
|
|
gs->gather_head = gs->hold;
|
|
gs->gathered += ep-p;
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
|
|
case gif_oom:
|
|
ILTRACE(1,("il:gif: reached oom state"));
|
|
return MK_OUT_OF_MEMORY;
|
|
break;
|
|
|
|
case gif_error:
|
|
ILTRACE(2,("il:gif: reached error state"));
|
|
return MK_IMAGE_LOSSAGE;
|
|
break;
|
|
|
|
default:
|
|
ILTRACE(0,("il:gif: unknown state"));
|
|
PR_ASSERT(0);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
il_gif_complete(il_container *ic)
|
|
{
|
|
if (ic->ds)
|
|
{
|
|
gif_struct *gs = (gif_struct*) ic->ds;
|
|
|
|
/* No more data in the stream, but we may still have work to do,
|
|
so don't actually free any of the data structures. */
|
|
if (gs->delay_timeout) {
|
|
/* We will free the data structures when image display completes. */
|
|
gs->destroy_pending = TRUE;
|
|
return;
|
|
} else if (gs->requested_buffer_fullness) {
|
|
/* We will free the data structures when image display completes. */
|
|
gs->destroy_pending = TRUE;
|
|
process_buffered_gif_input_data(gs);
|
|
return;
|
|
}
|
|
|
|
il_gif_abort(ic);
|
|
}
|
|
if (ic->imgdcb)
|
|
ic->imgdcb->ImgDCBHaveImageAll();
|
|
else
|
|
il_gif_abort(ic);
|
|
|
|
}
|
|
|
|
/* Free up all the data structures associated with decoding a GIF */
|
|
void
|
|
il_gif_abort(il_container *ic)
|
|
{
|
|
if (ic->ds)
|
|
{
|
|
gif_struct *gs = (gif_struct*) ic->ds;
|
|
|
|
/* Clear any pending timeouts */
|
|
if (gs->delay_timeout) {
|
|
ic->imgdcb->ImgDCBClearTimeout(gs->delay_timeout);
|
|
gs->delay_timeout = NULL;
|
|
}
|
|
|
|
PR_FREEIF(gs->rowbuf);
|
|
PR_FREEIF(gs->rgbrow);
|
|
PR_FREEIF(gs->prefix);
|
|
PR_FREEIF(gs->suffix);
|
|
PR_FREEIF(gs->stack);
|
|
|
|
PR_FREEIF(gs->hold);
|
|
|
|
/* Free the colormap that is not in use. The other one, if
|
|
* present, will be freed when the image container is
|
|
* destroyed.
|
|
*/
|
|
|
|
if (gs->is_local_colormap_defined) {
|
|
if (gs->global_colormap) {
|
|
PR_FREEIF(gs->global_colormap);
|
|
gs->global_colormap = NULL;
|
|
}
|
|
} else {
|
|
if (gs->local_colormap) {
|
|
PR_FREEIF(gs->local_colormap);
|
|
gs->local_colormap = NULL;
|
|
}
|
|
}
|
|
|
|
PR_FREEIF(gs);
|
|
ic->ds = 0;
|
|
}
|
|
}
|
|
|