removed pnghand from MSW sources - obsoleted

[wxWidgets.git] / src / common / gifdecod.cpp

diff --git a/src/common/gifdecod.cpp b/src/common/gifdecod.cpp
index 32a89223c3838334d6f7f72272d0fa535999bded..39dfd44e8cbdf12ac87a15d5739fcc7098322f9f 100644 (file)
--- a/src/common/gifdecod.cpp
+++ b/src/common/gifdecod.cpp
@@ -2,8 +2,8 @@
 // Name:        gifdecod.cpp
 // Purpose:     wxGIFDecoder, GIF reader for wxImage and wxAnimation
 // Author:      Guillermo Rodriguez Garcia <guille@iies.es>
-// Version:     3.02
-// Last rev:    1999/08/18
+// Version:     3.04
+// RCS-ID:      $Id$
 // Copyright:   (c) Guillermo Rodriguez Garcia
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
@@ -20,16 +20,15 @@
 #endif
 
 #ifndef WX_PRECOMP
-#  include "wx/setup.h"
+#  include "wx/defs.h"
 #endif
 
-#if wxUSE_STREAMS
+#if wxUSE_STREAMS && wxUSE_GIF
 
 #include <stdlib.h>
 #include <string.h>
-#include "wx/defs.h"
 #include "wx/gifdecod.h"
- 
+
 
 //---------------------------------------------------------------------------
 // wxGIFDecoder constructor and destructor
@@ -58,7 +57,7 @@ wxGIFDecoder::~wxGIFDecoder()
 
 void wxGIFDecoder::Destroy()
 {
-    IMAGEN *pimg, *paux;
+    GIFImage *pimg, *paux;
 
     pimg = m_pfirst;
 
@@ -67,7 +66,7 @@ void wxGIFDecoder::Destroy()
         paux = pimg->next;
         free(pimg->p);
         free(pimg->pal);
-        free(pimg);
+        delete pimg;
         pimg = paux;
     }
 }
@@ -132,7 +131,7 @@ bool wxGIFDecoder::ConvertToImage(wxImage *image) const
     return TRUE;
 }
 
-                 
+
 //---------------------------------------------------------------------------
 // Data accessors
 //---------------------------------------------------------------------------
@@ -203,7 +202,7 @@ bool wxGIFDecoder::GoNextFrame(bool cyclic)
     }
     else
         return FALSE;
-}            
+}
 
 bool wxGIFDecoder::GoPrevFrame(bool cyclic)
 {
@@ -283,10 +282,14 @@ int wxGIFDecoder::getcode(int bits, int ab_fin)
                 code = ab_fin;
                 break;
             }
+
+            /* prefetch data */
+            m_f->Read((void *) m_buffer, m_restbyte);
+            m_bufp = m_buffer;
         }
 
         /* read next byte and isolate the bits we need */
-        m_lastbyte = (unsigned char)m_f->GetC();
+        m_lastbyte = (unsigned char) (*m_bufp++);
         mask       = (1 << (bits - m_restbits)) - 1;
         code       = code + ((m_lastbyte & mask) << m_restbits);
         m_restbyte--;
@@ -294,7 +297,7 @@ int wxGIFDecoder::getcode(int bits, int ab_fin)
         /* adjust total number of bits extracted from the buffer */
         m_restbits = m_restbits + 8;
     }
-    
+
     /* find number of bits remaining for next code */
     m_restbits = (m_restbits - bits);
 
@@ -306,7 +309,7 @@ int wxGIFDecoder::getcode(int bits, int ab_fin)
 //  GIF decoding function. The initial code size (aka root size)
 //  is 'bits'. Supports interlaced images (interl == 1).
 //
-int wxGIFDecoder::dgif(IMAGEN *img, int interl, int bits)
+int wxGIFDecoder::dgif(GIFImage *img, int interl, int bits)
 {
     int ab_prefix[4096];        /* alphabet (prefixes) */
     int ab_tail[4096];          /* alphabet (tails) */
@@ -336,7 +339,7 @@ int wxGIFDecoder::dgif(IMAGEN *img, int interl, int bits)
     pass     = 1;
     pos = x = y = 0;
 
-    /* reset static globals */
+    /* reset decoder vars */
     m_restbits = 0;
     m_restbyte = 0;
     m_lastbyte = 0;
@@ -446,8 +449,8 @@ bool wxGIFDecoder::CanRead()
 {
     unsigned char buf[3];
 
-    m_f->SeekI(0, wxFromStart);
     m_f->Read(buf, 3);
+    m_f->SeekI(-3, wxFromCurrent);
 
     return (memcmp(buf, "GIF", 3) == 0);
 }
@@ -458,9 +461,9 @@ bool wxGIFDecoder::CanRead()
 //  animated GIF support is enabled. Can read GIFs with any bit
 //  size (color depth), but the output images are always expanded
 //  to 8 bits per pixel. Also, the image palettes always contain
-//  256 colors, although some of them may be unused. Returns E_OK
-//  (== 0) on success, or an error code if something fails. Error
-//  codes are E_ARCHIVO, E_FORMATO, E_MEMORIA (see header file).
+//  256 colors, although some of them may be unused. Returns GIF_OK
+//  (== 0) on success, or an error code if something fails (see
+//  header file for details)
 //
 int wxGIFDecoder::ReadGIF()
 {
@@ -470,14 +473,13 @@ int wxGIFDecoder::ReadGIF()
     unsigned char type;
     unsigned char pal[768];
     unsigned char buf[16];
-    IMAGEN        **ppimg, *pimg, *pprev;
+    GIFImage      **ppimg, *pimg, *pprev;
 
     /* check GIF signature */
     if (!CanRead())
-        return E_FORMATO;
+        return wxGIF_INVFORMAT;
 
     /* check for and animated GIF support (ver. >= 89a) */
-    m_f->SeekI(0, wxFromStart);
     m_f->Read(buf, 6);
 
     if (memcmp(buf + 3, "89a", 3) < 0)
@@ -507,7 +509,13 @@ int wxGIFDecoder::ReadGIF()
     pprev = NULL;
     pimg  = NULL;
 
+#if defined(__VISAGECPP__)
+// VA just can't stand while(1)
+    bool bOs2var = TRUE;
+    while(bOs2var)
+#else
     while (1)
+#endif
     {
         type = (unsigned char)m_f->GetC();
 
@@ -535,14 +543,16 @@ int wxGIFDecoder::ReadGIF()
             }
             else
             /* other extension, skip */
-            {   
+            {
                 while ((i = (unsigned char)m_f->GetC()) != 0)
                 {
                     /* This line should not be neccessary!
                      * Some images are not loaded correctly
                      * without it. A bug in wxStream?
+                     * Yes. Fixed now.
                      */
                     // m_f->SeekI(m_f->TellI(), wxFromStart);
+
                     m_f->SeekI(i, wxFromCurrent);
                 }
             }
@@ -552,12 +562,12 @@ int wxGIFDecoder::ReadGIF()
         if (type == 0x2C)
         {
             /* allocate memory for IMAGEN struct */
-            pimg = (*ppimg) = (IMAGEN *) malloc(sizeof(IMAGEN));
+            pimg = (*ppimg) = new GIFImage();
 
             if (pimg == NULL)
             {
                 Destroy();
-                return E_MEMORIA;
+                return wxGIF_MEMERR;
             }
 
             /* fill in the data */
@@ -584,7 +594,7 @@ int wxGIFDecoder::ReadGIF()
             if ((!pimg->p) || (!pimg->pal))
             {
                 Destroy();
-                return E_MEMORIA;
+                return wxGIF_MEMERR;
             }
 
             /* load local color map if available, else use global map */
@@ -618,7 +628,7 @@ int wxGIFDecoder::ReadGIF()
         m_pimage = m_pfirst;
     }
 
-    return E_OK;
+    return wxGIF_OK;
 }
 
-#endif // wxUSE_STREAM
+#endif // wxUSE_STREAMS && wxUSE_GIF