somebody added #ifdefed #pragma to disable warnings about // in c source, instead...

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

diff --git a/src/common/gifdecod.cpp b/src/common/gifdecod.cpp
index 3345366d7b250423acf27a58f1adb0c8404f9505..66c9aad915b90b6f252fc7553e6c5c9eb3e51c66 100644 (file)
--- a/src/common/gifdecod.cpp
+++ b/src/common/gifdecod.cpp
@@ -57,7 +57,7 @@ wxGIFDecoder::~wxGIFDecoder()
 
 void wxGIFDecoder::Destroy()
 {
-    IMAGEN *pimg, *paux;
+    GIFImage *pimg, *paux;
 
     pimg = m_pfirst;
 
@@ -66,7 +66,7 @@ void wxGIFDecoder::Destroy()
         paux = pimg->next;
         free(pimg->p);
         free(pimg->pal);
-        free(pimg);
+        delete pimg;
         pimg = paux;
     }
 }
@@ -282,10 +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--;
@@ -305,7 +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) */
@@ -335,7 +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;
@@ -446,7 +450,7 @@ bool wxGIFDecoder::CanRead()
     unsigned char buf[3];
 
     m_f->Read(buf, 3);
-    stream.SeekI(-3, wxFromCurrent);
+    m_f->SeekI(-3, wxFromCurrent);
 
     return (memcmp(buf, "GIF", 3) == 0);
 }
@@ -457,9 +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()
 {
@@ -469,11 +473,11 @@ 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->Read(buf, 6);
@@ -558,12 +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 */
@@ -584,13 +588,13 @@ int wxGIFDecoder::ReadGIF()
             ppimg = &pimg->next;
 
             /* allocate memory for image and palette */
-            pimg->p   = (unsigned char *) malloc(size);
+            pimg->p   = (unsigned char *) malloc((size_t)size);
             pimg->pal = (unsigned char *) malloc(768);
 
             if ((!pimg->p) || (!pimg->pal))
             {
                 Destroy();
-                return E_MEMORIA;
+                return wxGIF_MEMERR;
             }
 
             /* load local color map if available, else use global map */
@@ -624,7 +628,7 @@ int wxGIFDecoder::ReadGIF()
         m_pimage = m_pfirst;
     }
 
-    return E_OK;
+    return wxGIF_OK;
 }
 
 #endif // wxUSE_STREAMS && wxUSE_GIF