Bug 217025 - GIF decoder cleanup. r=pavlov, sr=darin

modules/libpr0n/decoders/gif/GIF2.cpp

@@ -428,18 +428,6 @@ static int do_lzw(gif_struct *gs, const PRUint8 *q)
   return 0;
 }
 
-PRBool gif_create(gif_struct **gs)
-{
-  gif_struct *ret = PR_NEWZAP(gif_struct);
-
-  if (!ret)
-    return PR_FALSE;
-
-  *gs = ret;
-
-  return PR_TRUE;
-}
-
 static inline void *gif_calloc(size_t n, size_t s)
 {
   if (!gGifAllocator)
@@ -930,11 +918,9 @@ PRStatus gif_write(gif_struct *gs, const PRUint8 *buf, PRUint32 len)
         gs->local_colormap_size = num_colors;
 
         /* Switch to the new local palette after it loads */
-        gs->is_local_colormap_defined = PR_TRUE;
         GETN(gs->local_colormap_size * 3, gif_image_colormap);
       } else {
         /* Switch back to the global palette */
-        gs->is_local_colormap_defined = PR_FALSE;
         GETN(1, gif_lzw_start);
       }
     }

modules/libpr0n/decoders/gif/GIF2.h

@@ -88,7 +88,6 @@ typedef struct gif_struct {
     /* Parsing state machine */
     gstate state;               /* Curent decoder master state */
     PRUint8 *hold;                /* Accumulation buffer */
-    int32 hold_size;            /* Capacity, in bytes, of accumulation buffer */
     PRUint8 *gather_head;         /* Next byte to read in accumulation buffer */
     int32 gather_request_size;  /* Number of bytes to accumulate */
     int32 gathered;             /* bytes accumulated so far*/
@@ -122,15 +121,11 @@ typedef struct gif_struct {
     /* Parameters for image frame currently being decoded*/
     PRUintn x_offset, y_offset;    /* With respect to "screen" origin */
     PRUintn height, width;
-    PRUintn last_x_offset, last_y_offset; /* With respect to "screen" origin */
-    PRUintn last_height, last_width;
     int interlaced;             /* TRUE, if scanlines arrive interlaced order */
     int tpixel;                 /* Index of transparent pixel */
     int is_transparent;         /* TRUE, if tpixel is valid */
     int control_extension;      /* TRUE, if image control extension present */
-    int is_local_colormap_defined;
     gdispose disposal_method;   /* Restore to background, leave in place, etc.*/
-    gdispose last_disposal_method;
     PRUint8 *local_colormap;    /* Per-image colormap */
     int local_colormap_size;    /* Size of local colormap array. */
     PRUint32 delay_time;        /* Display time, in milliseconds,
@@ -144,30 +139,21 @@ typedef struct gif_struct {
     PRUint8 *global_colormap;   /* Default colormap if local not supplied  */
     int global_colormap_size;   /* Size of global colormap array. */
     int images_decoded;         /* Counts images for multi-part GIFs */
-    int destroy_pending;        /* Stream has ended */
     int progressive_display;    /* If TRUE, do Haeberli interlace hack */
     int loop_count;             /* Netscape specific extension block to control
                                    the number of animation loops a GIF renders. */
 } gif_struct;
 
 
-/* Create a new gif_struct */
-extern PRBool gif_create(gif_struct **gs);
-
 /* These are the APIs that the client calls to intialize,
 push data to, and shut down the GIF decoder. */
 PRBool GIFInit(gif_struct* gs, void* aClientData);
 
-extern void gif_destroy(gif_struct* aGIFStruct);
+void gif_destroy(gif_struct* aGIFStruct);
 
 PRStatus gif_write(gif_struct* aGIFStruct, const PRUint8 * buf, PRUint32 numbytes);
 
 PRBool gif_write_ready(const gif_struct* aGIFStruct);
 
-extern void gif_complete(gif_struct** aGIFStruct);
-extern void gif_delay_time_callback(/* void *closure */);
-
-
-    
 #endif
 

modules/libpr0n/decoders/gif/nsGIFDecoder2.cpp

@@ -83,9 +83,9 @@ NS_IMETHODIMP nsGIFDecoder2::Init(imgILoad *aLoad)
   /* do gif init stuff */
   /* Always decode to 24 bit pixdepth */
   
-  PRBool created = gif_create(&mGIFStruct);
-  NS_ASSERTION(created, "gif_create failed");
-  if (!created)
+  mGIFStruct = (gif_struct *)PR_CALLOC(sizeof(gif_struct));
+  NS_ASSERTION(mGIFStruct, "gif_create failed");
+  if (!mGIFStruct)
     return NS_ERROR_FAILURE;
 
   // Call GIF decoder init routine

modules/libpr0n/decoders/gif/nsGifAllocator.h

@@ -1,104 +0,0 @@
-/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- * http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- *
- * The Original Code is mozilla.org code.
- *
- * The Initial Developer of the Original Code is
- * Netscape Communications Corporation.
- * Portions created by the Initial Developer are Copyright (C) 2001
- * the Initial Developer. All Rights Reserved.
- *
- * Contributor(s):
- *
- * Alternatively, the contents of this file may be used under the terms of
- * either the GNU General Public License Version 2 or later (the "GPL"), or
- * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
- * in which case the provisions of the GPL or the LGPL are applicable instead
- * of those above. If you wish to allow use of your version of this file only
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the MPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * the provisions above, a recipient may use your version of this file under
- * the terms of any one of the MPL, the GPL or the LGPL.
- *
- * ***** END LICENSE BLOCK ***** */
-
-/* 
- * Allocator optimized for use with gif decoder
- *
- * For every image that gets loaded, we allocate
- *     4097 x 2 : gs->prefix
- *     4097 x 1 : gs->suffix
- *     4097 x 1 : gs->stack
- * for lzw to operate on the data. These are held for a very short interval
- * and freed. This allocator tries to keep one set of these around
- * and reuses them; automatically fails over to use calloc/free when all
- * buckets are full.
- */
-
-#include "prlock.h"
-#include "prlog.h"
-
-class nsGifAllocator;
-extern nsGifAllocator *gGifAllocator;
-
-const PRInt32 kNumBuckets = 3;
-
-class nsGifAllocator {
- protected:
-    void *mMemBucket[kNumBuckets];
-    PRUint32 mSize[kNumBuckets];
-    PRLock *mLock;
-    PRUint32 mFlag;
-
- public:
-    nsGifAllocator() : mFlag(0), mLock(nsnull)
-    {
-        memset(mMemBucket, 0, sizeof mMemBucket);
-        memset(mSize, 0, sizeof mSize);
-        mLock = PR_NewLock();
-        PR_ASSERT(mLock != NULL);
-    }
-
-    ~nsGifAllocator()
-    {
-        ClearBuckets();
-        if (mLock)
-            PR_DestroyLock(mLock);
-    }
-
-    // Gif allocators
-    void* Calloc(PRUint32 items, PRUint32 size);
-    void Free(void *ptr);
-    // Clear all buckets of memory
-    void ClearBuckets();
-
-    // in-use flag getters/setters
-    inline PRBool IsUsed(PRUint32 i)
-    {
-        PR_ASSERT(i <= 31);
-        return mFlag & (1 << i);
-    }
-    inline void MarkUsed(PRUint32 i)
-    {
-        PR_ASSERT(i <= 31);
-        mFlag |= (1 << i);
-    }
-    inline void ClearUsed(PRUint32 i)
-    {
-        PR_ASSERT(i <= 31);
-        mFlag &= ~(1 << i);
-    }
-};