// Version: 3.04
// RCS-ID: $Id$
// Copyright: (c) Guillermo Rodriguez Garcia
-// Licence: wxWidgets licence
+// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
-#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
-#pragma implementation "gifdecod.h"
-#endif
-
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
image->Create(GetWidth(), GetHeight());
if (!image->Ok())
- return FALSE;
+ return false;
pal = GetPalette();
src = GetData();
image->SetMaskColour(255, 0, 255);
}
else
- image->SetMask(FALSE);
+ image->SetMask(false);
#if wxUSE_PALETTE
if (pal)
*(dst++) = pal[3 * (*src) + 2];
}
- return TRUE;
+ return true;
}
bool wxGIFDecoder::GoFirstFrame()
{
if (!IsAnimation())
- return FALSE;
+ return false;
m_image = 1;
m_pimage = m_pfirst;
- return TRUE;
+ return true;
}
bool wxGIFDecoder::GoLastFrame()
{
if (!IsAnimation())
- return FALSE;
+ return false;
m_image = m_nimages;
m_pimage = m_plast;
- return TRUE;
+ return true;
}
bool wxGIFDecoder::GoNextFrame(bool cyclic)
{
if (!IsAnimation())
- return FALSE;
+ return false;
if ((m_image < m_nimages) || (cyclic))
{
m_pimage = m_pfirst;
}
- return TRUE;
+ return true;
}
else
- return FALSE;
+ return false;
}
bool wxGIFDecoder::GoPrevFrame(bool cyclic)
{
if (!IsAnimation())
- return FALSE;
+ return false;
if ((m_image > 1) || (cyclic))
{
m_pimage = m_plast;
}
- return TRUE;
+ return true;
}
else
- return FALSE;
+ return false;
}
bool wxGIFDecoder::GoFrame(int which)
{
- int i;
-
if (!IsAnimation())
- return FALSE;
+ return false;
if ((which >= 1) && (which <= m_nimages))
{
+ m_image = 1;
m_pimage = m_pfirst;
- for (i = 0; i < which; i++)
+ while (m_image < which)
+ {
+ m_image++;
m_pimage = m_pimage->next;
+ }
- return TRUE;
+ return true;
}
else
- return FALSE;
+ return false;
}
/* loop until a valid y coordinate has been
found, Or if the maximum number of passes has
been reached, exit the loop, and stop image
- decoding (At this point the image is succesfully
+ decoding (At this point the image is successfully
decoded).
If we don't loop, but merely set y to some other
value, that new value might still be invalid depending
// CanRead:
-// Returns TRUE if the file looks like a valid GIF, FALSE otherwise.
+// Returns true if the file looks like a valid GIF, false otherwise.
//
bool wxGIFDecoder::CanRead()
{
unsigned char buf[3];
if ( !m_f->Read(buf, WXSIZEOF(buf)) )
- return FALSE;
+ return false;
- m_f->SeekI(-(off_t)WXSIZEOF(buf), wxFromCurrent);
+ m_f->SeekI(-(wxFileOffset)WXSIZEOF(buf), wxFromCurrent);
return memcmp(buf, "GIF", WXSIZEOF(buf)) == 0;
}
if (memcmp(buf + 3, "89a", 3) < 0)
{
- m_anim = FALSE;
+ m_anim = false;
}
/* read logical screen descriptor block (LSDB) */
pprev = NULL;
pimg = NULL;
- bool done = FALSE;
+ bool done = false;
while(!done)
{
/* end of data? */
if (type == 0x3B)
{
- done = TRUE;
+ done = true;
}
else
/* extension block? */
transparent = buf[4];
/* read disposal method */
- disposal = (buf[1] & 0x1C) - 1;
+ disposal = ((buf[1] & 0x1C) >> 2) - 1;
}
else
/* other extension, skip */
m_f->SeekI(i, wxFromCurrent);
if (m_f->Eof())
{
- done = TRUE;
+ done = true;
break;
}
}
/* if this is not an animated GIF, exit after first image */
if (!m_anim)
- done = TRUE;
+ done = true;
}
}
if ((buf[8] & 0x80) == 0x80)
{
ncolors = 2 << (buf[8] & 0x07);
- off_t pos = m_f->TellI();
- off_t numBytes = 3 * ncolors;
+ wxFileOffset pos = m_f->TellI();
+ wxFileOffset numBytes = 3 * ncolors;
m_f->SeekI(numBytes, wxFromCurrent);
if (m_f->TellI() != (pos + numBytes))
{