| 1 | ///////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: imaggif.cpp |
| 3 | // Purpose: wxGIFHandler |
| 4 | // Author: Vaclav Slavik & Guillermo Rodriguez Garcia |
| 5 | // RCS-ID: $Id$ |
| 6 | // Copyright: (c) 1999 Vaclav Slavik & Guillermo Rodriguez Garcia |
| 7 | // Licence: wxWindows licence |
| 8 | ///////////////////////////////////////////////////////////////////////////// |
| 9 | |
| 10 | #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA) |
| 11 | #pragma implementation "imaggif.h" |
| 12 | #endif |
| 13 | |
| 14 | // For compilers that support precompilation, includes "wx.h". |
| 15 | #include "wx/wxprec.h" |
| 16 | |
| 17 | #ifdef __BORLANDC__ |
| 18 | # pragma hdrstop |
| 19 | #endif |
| 20 | |
| 21 | #ifndef WX_PRECOMP |
| 22 | # include "wx/defs.h" |
| 23 | #endif |
| 24 | |
| 25 | #if wxUSE_IMAGE && wxUSE_GIF |
| 26 | |
| 27 | #include "wx/imaggif.h" |
| 28 | #include "wx/gifdecod.h" |
| 29 | #include "wx/wfstream.h" |
| 30 | #include "wx/log.h" |
| 31 | #include "wx/intl.h" |
| 32 | |
| 33 | IMPLEMENT_DYNAMIC_CLASS(wxGIFHandler,wxImageHandler) |
| 34 | |
| 35 | //----------------------------------------------------------------------------- |
| 36 | // wxGIFHandler |
| 37 | //----------------------------------------------------------------------------- |
| 38 | |
| 39 | #if wxUSE_STREAMS |
| 40 | |
| 41 | bool wxGIFHandler::LoadFile(wxImage *image, wxInputStream& stream, |
| 42 | bool verbose, int index) |
| 43 | { |
| 44 | wxGIFDecoder *decod; |
| 45 | int error; |
| 46 | bool ok = TRUE; |
| 47 | |
| 48 | // image->Destroy(); |
| 49 | decod = new wxGIFDecoder(&stream, TRUE); |
| 50 | error = decod->ReadGIF(); |
| 51 | |
| 52 | if ((error != wxGIF_OK) && (error != wxGIF_TRUNCATED)) |
| 53 | { |
| 54 | if (verbose) |
| 55 | { |
| 56 | switch (error) |
| 57 | { |
| 58 | case wxGIF_INVFORMAT: |
| 59 | wxLogError(_("GIF: error in GIF image format.")); |
| 60 | break; |
| 61 | case wxGIF_MEMERR: |
| 62 | wxLogError(_("GIF: not enough memory.")); |
| 63 | break; |
| 64 | default: |
| 65 | wxLogError(_("GIF: unknown error!!!")); |
| 66 | break; |
| 67 | } |
| 68 | } |
| 69 | delete decod; |
| 70 | return FALSE; |
| 71 | } |
| 72 | |
| 73 | if ((error == wxGIF_TRUNCATED) && verbose) |
| 74 | { |
| 75 | wxLogError(_("GIF: data stream seems to be truncated.")); |
| 76 | /* go on; image data is OK */ |
| 77 | } |
| 78 | |
| 79 | if (index != -1) |
| 80 | { |
| 81 | // We're already on index = 0 by default. So no need |
| 82 | // to call GoFrame(0) then. On top of that GoFrame doesn't |
| 83 | // accept an index of 0. (Instead GoFirstFrame() should be used) |
| 84 | // Also if the gif image has only one frame, calling GoFrame(0) |
| 85 | // fails because GoFrame() only works with gif animations. |
| 86 | // (It fails if IsAnimation() returns FALSE) |
| 87 | // All valid reasons to NOT call GoFrame when index equals 0. |
| 88 | if (index != 0) |
| 89 | { |
| 90 | ok = decod->GoFrame(index); |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | if (ok) |
| 95 | { |
| 96 | ok = decod->ConvertToImage(image); |
| 97 | } |
| 98 | else |
| 99 | { |
| 100 | wxLogError(_("GIF: Invalid gif index.")); |
| 101 | } |
| 102 | |
| 103 | delete decod; |
| 104 | |
| 105 | return ok; |
| 106 | } |
| 107 | |
| 108 | bool wxGIFHandler::SaveFile( wxImage * WXUNUSED(image), |
| 109 | wxOutputStream& WXUNUSED(stream), bool verbose ) |
| 110 | { |
| 111 | if (verbose) |
| 112 | wxLogDebug(wxT("GIF: the handler is read-only!!")); |
| 113 | |
| 114 | return FALSE; |
| 115 | } |
| 116 | |
| 117 | bool wxGIFHandler::DoCanRead( wxInputStream& stream ) |
| 118 | { |
| 119 | wxGIFDecoder decod(&stream); |
| 120 | return decod.CanRead(); |
| 121 | } |
| 122 | |
| 123 | #endif // wxUSE_STREAMS |
| 124 | |
| 125 | #endif // wxUSE_GIF |