/////////////////////////////////////////////////////////////////////////////
-// Name: imagbmp.cpp
+// Name: src/common/imagbmp.cpp
// Purpose: wxImage BMP,ICO and CUR handlers
// Author: Robert Roebling, Chris Elliott
// RCS-ID: $Id$
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
-#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
-#pragma implementation "imagbmp.h"
-#endif
-
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
-#pragma hdrstop
+ #pragma hdrstop
#endif
-#include "wx/defs.h"
-
#if wxUSE_IMAGE
#include "wx/imagbmp.h"
-#include "wx/bitmap.h"
-#include "wx/debug.h"
-#include "wx/log.h"
-#include "wx/app.h"
+
+#ifndef WX_PRECOMP
+ #ifdef __WXMSW__
+ #include "wx/msw/wrapwin.h"
+ #endif
+ #include "wx/log.h"
+ #include "wx/app.h"
+ #include "wx/bitmap.h"
+ #include "wx/palette.h"
+ #include "wx/intl.h"
+ #include "wx/math.h"
+#endif
+
#include "wx/filefn.h"
#include "wx/wfstream.h"
-#include "wx/intl.h"
-#include "wx/module.h"
#include "wx/quantize.h"
+#include "wx/scopeguard.h"
+#include "wx/anidecod.h"
// For memcpy
#include <string.h>
-#ifdef __SALFORDC__
-#ifdef FAR
-#undef FAR
-#endif
-#endif
+// ----------------------------------------------------------------------------
+// private functions
+// ----------------------------------------------------------------------------
-#ifdef __WXMSW__
-#include "wx/msw/wrapwin.h"
-#endif
+#if wxUSE_ICO_CUR
+
+static bool CanReadICOOrCUR(wxInputStream *stream, wxUint16 resourceType);
+
+#endif // wxUSE_ICO_CUR
//-----------------------------------------------------------------------------
// wxBMPHandler
bool IsMask)
{
- wxCHECK_MSG( image, false, _T("invalid pointer in wxBMPHandler::SaveFile") );
+ wxCHECK_MSG( image, false, wxT("invalid pointer in wxBMPHandler::SaveFile") );
- if ( !image->Ok() )
+ if ( !image->IsOk() )
{
if ( verbose )
+ {
wxLogError(_("BMP: Couldn't save invalid image."));
+ }
return false;
}
)
{
if ( verbose )
+ {
wxLogError(_("BMP: wxImage doesn't have own wxPalette."));
+ }
return false;
}
bpp = 8;
}
unsigned width = image->GetWidth();
- unsigned row_padding = (4 - int(width*bpp/8.0) % 4) % 4; // # bytes to pad to dword
- unsigned row_width = int(width * bpp/8.0) + row_padding; // # of bytes per row
+ unsigned row_padding = (4 - ((width * bpp + 7) / 8) % 4) % 4; // # bytes to pad to dword
+ unsigned row_width = (width * bpp + 7) / 8 + row_padding; // # of bytes per row
struct
{
wxUint16 bpp; // bits per pixel
wxUint32 compression; // compression method
wxUint32 size_of_bmp; // size of the bitmap
- wxUint32 h_res, v_res; // image resolution in dpi
+ wxUint32 h_res, v_res; // image resolution in pixels-per-meter
wxUint32 num_clrs; // number of colors used
wxUint32 num_signif_clrs;// number of significant colors
} hdr;
hdr.bpp = wxUINT16_SWAP_ON_BE(bpp);
hdr.compression = 0; // RGB uncompressed
hdr.size_of_bmp = wxUINT32_SWAP_ON_BE(row_width * image->GetHeight());
- hdr.h_res = hdr.v_res = wxUINT32_SWAP_ON_BE(72); // 72dpi is standard
+
+ // get the resolution from the image options or fall back to 72dpi standard
+ // for the BMP format if not specified
+ int hres, vres;
+ switch ( GetResolutionFromOptions(*image, &hres, &vres) )
+ {
+ default:
+ wxFAIL_MSG( wxT("unexpected image resolution units") );
+ // fall through
+
+ case wxIMAGE_RESOLUTION_NONE:
+ hres =
+ vres = 72;
+ // fall through to convert it to correct units
+
+ case wxIMAGE_RESOLUTION_INCHES:
+ // convert resolution in inches to resolution in centimeters
+ hres = (int)(10*mm2inches*hres);
+ vres = (int)(10*mm2inches*vres);
+ // fall through to convert it to resolution in meters
+
+ case wxIMAGE_RESOLUTION_CM:
+ // convert resolution in centimeters to resolution in meters
+ hres *= 100;
+ vres *= 100;
+ break;
+ }
+
+ hdr.h_res = wxUINT32_SWAP_ON_BE(hres);
+ hdr.v_res = wxUINT32_SWAP_ON_BE(vres);
hdr.num_clrs = wxUINT32_SWAP_ON_BE(palette_size); // # colors in colormap
hdr.num_signif_clrs = 0; // all colors are significant
)
{
if (verbose)
+ {
wxLogError(_("BMP: Couldn't write the file (Bitmap) header."));
+ }
return false;
}
}
)
{
if (verbose)
+ {
wxLogError(_("BMP: Couldn't write the file (BitmapInfo) header."));
+ }
return false;
}
}
if ( !stream.Write(rgbquad, palette_size*4) )
{
if (verbose)
+ {
wxLogError(_("BMP: Couldn't write RGB color map."));
+ }
delete[] rgbquad;
#if wxUSE_PALETTE
delete palette;
// pointer to the image data, use quantized if available
wxUint8 *data = (wxUint8*) image->GetData();
- if (q_image) if (q_image->Ok()) data = (wxUint8*) q_image->GetData();
+ if (q_image) if (q_image->IsOk()) data = (wxUint8*) q_image->GetData();
wxUint8 *buffer = new wxUint8[row_width];
memset(buffer, 0, row_width);
if ( !stream.Write(buffer, row_width) )
{
if (verbose)
+ {
wxLogError(_("BMP: Couldn't write data."));
+ }
delete[] buffer;
#if wxUSE_PALETTE
delete palette;
}
-typedef struct
+struct BMPPalette
{
+ static void Free(BMPPalette* pal) { delete [] pal; }
+
unsigned char r, g, b;
-} _cmap;
+};
bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height,
int bpp, int ncolors, int comp,
wxFileOffset bmpOffset, wxInputStream& stream,
bool verbose, bool IsBmp, bool hasPalette)
{
- wxInt32 aDword, rmask = 0, gmask = 0, bmask = 0;
- int rshift = 0, gshift = 0, bshift = 0;
+ wxInt32 aDword, rmask = 0, gmask = 0, bmask = 0, amask = 0;
+ int rshift = 0, gshift = 0, bshift = 0, ashift = 0;
int rbits = 0, gbits = 0, bbits = 0;
wxInt32 dbuf[4];
wxInt8 bbuf[4];
wxUint16 aWord;
// allocate space for palette if needed:
- _cmap *cmap;
+ BMPPalette *cmap;
if ( bpp < 16 )
{
- cmap = new _cmap[ncolors];
+ cmap = new BMPPalette[ncolors];
if ( !cmap )
{
if (verbose)
+ {
wxLogError(_("BMP: Couldn't allocate memory."));
+ }
return false;
}
}
- else
+ else // no palette
+ {
cmap = NULL;
+ }
+
+ wxON_BLOCK_EXIT1(&BMPPalette::Free, cmap);
+
+ bool isUpsideDown = true;
+
+ if (height < 0)
+ {
+ isUpsideDown = false;
+ height = -height;
+ }
// destroy existing here instead of:
image->Destroy();
if ( !ptr )
{
if ( verbose )
+ {
wxLogError( _("BMP: Couldn't allocate memory.") );
- if ( cmap )
- delete[] cmap;
+ }
return false;
}
+ unsigned char *alpha;
+ if ( bpp == 32 )
+ {
+ // tell the image to allocate an alpha buffer
+ image->SetAlpha();
+ alpha = image->GetAlpha();
+ if ( !alpha )
+ {
+ if ( verbose )
+ {
+ wxLogError(_("BMP: Couldn't allocate memory."));
+ }
+ return false;
+ }
+ }
+ else // no alpha
+ {
+ alpha = NULL;
+ }
+
// Reading the palette, if it exists:
if ( bpp < 16 && ncolors != 0 )
{
{
if ( comp == BI_BITFIELDS )
{
- int bit = 0;
+ int bit;
stream.Read(dbuf, 4 * 3);
rmask = wxINT32_SWAP_ON_BE(dbuf[0]);
gmask = wxINT32_SWAP_ON_BE(dbuf[1]);
rmask = 0x00FF0000;
gmask = 0x0000FF00;
bmask = 0x000000FF;
+ amask = 0xFF000000;
+
+ ashift = 24;
rshift = 16;
gshift = 8;
bshift = 0;
* Reading the image data
*/
if ( IsBmp )
- stream.SeekI(bmpOffset); // else icon, just carry on
+ {
+ // NOTE: seeking a positive amount in wxFromCurrent mode allows us to
+ // load even non-seekable streams (see wxInputStream::SeekI docs)!
+ const wxFileOffset pos = stream.TellI();
+ if (pos != wxInvalidOffset && bmpOffset > pos)
+ if (stream.SeekI(bmpOffset - pos, wxFromCurrent) == wxInvalidOffset)
+ return false;
+ //else: icon, just carry on
+ }
unsigned char *data = ptr;
int linesize = ((width * bpp + 31) / 32) * 4;
- /* BMPs are stored upside down */
- for ( int line = (height - 1); line >= 0; line-- )
+ // flag indicating if we have any not fully transparent alpha values: this
+ // is used to account for the bitmaps which use 32bpp format (normally
+ // meaning that they have alpha channel) but have only zeroes in it so that
+ // without this hack they appear fully transparent -- and as this is
+ // unlikely intentional, we consider that they don't have alpha at all in
+ // this case (see #10915)
+ bool hasValidAlpha = false;
+
+ for ( int row = 0; row < height; row++ )
{
+ int line = isUpsideDown ? height - 1 - row : row;
+
int linepos = 0;
for ( int column = 0; column < width ; )
{
{
if ( aByte == 0 )
{
- if ( column > 0 )
- column = width;
+ // end of scanline marker
+ column = width;
+ row--;
}
else if ( aByte == 1 )
{
+ // end of RLE data marker, stop decoding
column = width;
- line = -1;
+ row = height;
}
else if ( aByte == 2 )
{
+ // delta marker, move in image
aByte = stream.GetC();
column += aByte;
linepos = column * bpp / 4;
aByte = stream.GetC();
- line -= aByte; // upside down
+ row += aByte; // upside down
}
else
{
{
for (int nibble = 0; nibble < 2 && column < width; nibble++)
{
- int index = ((aByte & (0xF0 >> nibble * 4)) >> (!nibble * 4));
+ int index = ((aByte & (0xF0 >> (nibble * 4))) >> (!nibble * 4));
if ( index >= 16 )
index = 15;
ptr[poffset] = cmap[index].r;
{
if ( aByte == 0 )
{
- /* column = width; */
+ // end of scanline marker
+ column = width;
+ row--;
}
else if ( aByte == 1 )
{
+ // end of RLE data marker, stop decoding
column = width;
- line = -1;
+ row = height;
}
else if ( aByte == 2 )
{
+ // delta marker, move in image
aByte = stream.GetC();
column += aByte;
linepos = column * bpp / 8;
aByte = stream.GetC();
- line += aByte;
+ row -= aByte;
}
else
{
stream.Read(&aWord, 2);
aWord = wxUINT16_SWAP_ON_BE(aWord);
linepos += 2;
- /* use the masks and calculated amonut of shift
+ /* Use the masks and calculated amount of shift
to retrieve the color data out of the word. Then
shift it left by (8 - number of bits) such that
the image has the proper dynamic range */
- temp = (unsigned char)((aWord & rmask) >> rshift << (8-rbits));
+ temp = (unsigned char)(((aWord & rmask) >> rshift) << (8-rbits));
ptr[poffset] = temp;
- temp = (unsigned char)((aWord & gmask) >> gshift << (8-gbits));
+ temp = (unsigned char)(((aWord & gmask) >> gshift) << (8-gbits));
ptr[poffset + 1] = temp;
- temp = (unsigned char)((aWord & bmask) >> bshift << (8-bbits));
+ temp = (unsigned char)(((aWord & bmask) >> bshift) << (8-bbits));
ptr[poffset + 2] = temp;
column++;
}
ptr[poffset + 1] = temp;
temp = (unsigned char)((aDword & bmask) >> bshift);
ptr[poffset + 2] = temp;
+ if ( alpha )
+ {
+ temp = (unsigned char)((aDword & amask) >> ashift);
+ alpha[line * width + column] = temp;
+
+ if ( temp != wxALPHA_TRANSPARENT )
+ hasValidAlpha = true;
+ }
column++;
}
}
}
}
- delete[] cmap;
-
image->SetMask(false);
+ // check if we had any valid alpha values in this bitmap
+ if ( alpha && !hasValidAlpha )
+ {
+ // we didn't, so finally discard the alpha channel completely
+ image->ClearAlpha();
+ }
+
const wxStreamError err = stream.GetLastError();
return err == wxSTREAM_NO_ERROR || err == wxSTREAM_EOF;
}
wxInt32 dbuf[4];
wxInt8 bbuf[4];
- wxFileOffset offset = 0; // keep gcc quiet
if ( IsBmp )
{
// read the header off the .BMP format file
-
- offset = stream.TellI();
- if (offset == wxInvalidOffset)
- offset = 0;
-
stream.Read(bbuf, 2);
stream.Read(dbuf, 16);
}
#if 0 // unused
wxInt32 size = wxINT32_SWAP_ON_BE(dbuf[0]);
#endif
- offset = offset + wxINT32_SWAP_ON_BE(dbuf[2]);
+ wxFileOffset offset = wxINT32_SWAP_ON_BE(dbuf[2]);
stream.Read(dbuf, 4 * 2);
int width = wxINT32_SWAP_ON_BE((int)dbuf[0]);
if ( width > 32767 )
{
if (verbose)
+ {
wxLogError( _("DIB Header: Image width > 32767 pixels for file.") );
+ }
return false;
}
if ( height > 32767 )
{
if (verbose)
+ {
wxLogError( _("DIB Header: Image height > 32767 pixels for file.") );
+ }
return false;
}
if ( bpp != 1 && bpp != 4 && bpp != 8 && bpp != 16 && bpp != 24 && bpp != 32 )
{
if (verbose)
+ {
wxLogError( _("DIB Header: Unknown bitdepth in file.") );
+ }
return false;
}
comp != BI_BITFIELDS )
{
if (verbose)
+ {
wxLogError( _("DIB Header: Unknown encoding in file.") );
+ }
return false;
}
stream.Read(dbuf, 4 * 2);
+
int ncolors = wxINT32_SWAP_ON_BE( (int)dbuf[0] );
if (ncolors == 0)
ncolors = 1 << bpp;
((comp == BI_BITFIELDS) && (bpp != 16 && bpp != 32)))
{
if (verbose)
+ {
wxLogError( _("DIB Header: Encoding doesn't match bitdepth.") );
+ }
return false;
}
verbose, IsBmp, true) )
{
if (verbose)
- wxLogError( _("Error in reading image DIB .") );
+ {
+ wxLogError( _("Error in reading image DIB.") );
+ }
return false;
}
verbose, IsBmp, false) )
{
if (verbose)
+ {
wxLogError( _("ICO: Error in reading mask DIB.") );
+ }
return false;
}
image->SetMaskFromImage(mask, 255, 255, 255);
}
+ // the resolution in the bitmap header is in meters, convert to centimeters
+ image->SetOption(wxIMAGE_OPTION_RESOLUTIONUNIT, wxIMAGE_RESOLUTION_CM);
+ image->SetOption(wxIMAGE_OPTION_RESOLUTIONX, dbuf[2]/100);
+ image->SetOption(wxIMAGE_OPTION_RESOLUTIONY, dbuf[3]/100);
+
return true;
}
{
unsigned char hdr[2];
- if ( !stream.Read(hdr, WXSIZEOF(hdr)) )
+ if ( !stream.Read(hdr, WXSIZEOF(hdr)) ) // it's ok to modify the stream position here
return false;
// do we have the BMP file signature?
if ( image->GetHeight () > 127 )
{
if ( verbose )
+ {
wxLogError(_("ICO: Image too tall for an icon."));
+ }
return false;
}
if ( image->GetWidth () > 255 )
{
if ( verbose )
+ {
wxLogError(_("ICO: Image too wide for an icon."));
+ }
return false;
}
if ( !stream.IsOk() )
{
if ( verbose )
+ {
wxLogError(_("ICO: Error writing the image file!"));
+ }
return false;
}
if ( !bResult )
{
if ( verbose )
+ {
wxLogError(_("ICO: Error writing the image file!"));
+ }
return false;
}
IsMask = true;
if ( !bResult )
{
if ( verbose )
+ {
wxLogError(_("ICO: Error writing the image file!"));
+ }
return false;
}
wxUint32 Size = cStream.GetSize();
- // wxCountingOutputStream::Ok() always returns true for now and this
+ // wxCountingOutputStream::IsOk() always returns true for now and this
// "if" provokes VC++ warnings in optimized build
#if 0
- if ( !cStream.Ok() )
+ if ( !cStream.IsOk() )
{
if ( verbose )
+ {
wxLogError(_("ICO: Error writing the image file!"));
+ }
return false;
}
#endif // 0
if ( !stream.IsOk() )
{
if ( verbose )
+ {
wxLogError(_("ICO: Error writing the image file!"));
+ }
return false;
}
if ( !bResult )
{
if ( verbose )
+ {
wxLogError(_("ICO: Error writing the image file!"));
+ }
return false;
}
IsMask = true;
if ( !bResult )
{
if ( verbose )
+ {
wxLogError(_("ICO: Error writing the image file!"));
+ }
return false;
}
bool wxICOHandler::LoadFile(wxImage *image, wxInputStream& stream,
bool verbose, int index)
{
- stream.SeekI(0);
+ if ( stream.IsSeekable() && stream.SeekI(0) == wxInvalidOffset )
+ {
+ return false;
+ }
+
return DoLoadFile(image, stream, verbose, index);
}
ICONDIR IconDir;
- wxFileOffset iPos = stream.TellI();
stream.Read(&IconDir, sizeof(IconDir));
wxUint16 nIcons = wxUINT16_SWAP_ON_BE(IconDir.idCount);
+
// nType is 1 for Icons, 2 for Cursors:
wxUint16 nType = wxUINT16_SWAP_ON_BE(IconDir.idType);
int colmax = 0;
int iSel = wxNOT_FOUND;
- for (int i = 0; i < nIcons; i++ )
+ // remember how many bytes we read from the stream:
+ wxFileOffset alreadySeeked = sizeof(IconDir);
+
+ for (unsigned int i = 0; i < nIcons; i++ )
{
- stream.Read(pCurrentEntry, sizeof(ICONDIRENTRY));
+ alreadySeeked += stream.Read(pCurrentEntry, sizeof(ICONDIRENTRY)).LastRead();
+
// bHeight and bColorCount are wxUint8
if ( pCurrentEntry->bWidth >= wMax )
{
colmax = pCurrentEntry->bColorCount;
}
}
+
pCurrentEntry++;
}
{
// seek to selected icon:
pCurrentEntry = pIconDirEntry + iSel;
- stream.SeekI(iPos + wxUINT32_SWAP_ON_BE(pCurrentEntry->dwImageOffset), wxFromStart);
+
+ // NOTE: seeking a positive amount in wxFromCurrent mode allows us to
+ // load even non-seekable streams (see wxInputStream::SeekI docs)!
+ wxFileOffset offset = wxUINT32_SWAP_ON_BE(pCurrentEntry->dwImageOffset) - alreadySeeked;
+ if (offset != 0 && stream.SeekI(offset, wxFromCurrent) == wxInvalidOffset)
+ return false;
+
bResult = LoadDib(image, stream, true, IsBmp);
bool bIsCursorType = (this->GetType() == wxBITMAP_TYPE_CUR) || (this->GetType() == wxBITMAP_TYPE_ANI);
if ( bResult && bIsCursorType && nType == 2 )
image->SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y, wxUINT16_SWAP_ON_BE(pCurrentEntry->wBitCount));
}
}
- delete[] pIconDirEntry;
+
+ delete [] pIconDirEntry;
+
return bResult;
}
-int wxICOHandler::GetImageCount(wxInputStream& stream)
+int wxICOHandler::DoGetImageCount(wxInputStream& stream)
{
+ // It's ok to modify the stream position in this function.
+
+ if ( stream.IsSeekable() && stream.SeekI(0) == wxInvalidOffset )
+ {
+ return 0;
+ }
+
ICONDIR IconDir;
- wxFileOffset iPos = stream.TellI();
- stream.SeekI(0);
- stream.Read(&IconDir, sizeof(IconDir));
- wxUint16 nIcons = wxUINT16_SWAP_ON_BE(IconDir.idCount);
- stream.SeekI(iPos);
- return (int)nIcons;
+
+ if (stream.Read(&IconDir, sizeof(IconDir)).LastRead() != sizeof(IconDir))
+ return 0;
+
+ return (int)wxUINT16_SWAP_ON_BE(IconDir.idCount);
}
bool wxICOHandler::DoCanRead(wxInputStream& stream)
{
- stream.SeekI(0);
- unsigned char hdr[4];
- if ( !stream.Read(hdr, WXSIZEOF(hdr)) )
- return false;
+ return CanReadICOOrCUR(&stream, 1 /*for identifying an icon*/);
- // hdr[2] is one for an icon and two for a cursor
- return hdr[0] == '\0' && hdr[1] == '\0' && hdr[2] == '\1' && hdr[3] == '\0';
}
#endif // wxUSE_STREAMS
bool wxCURHandler::DoCanRead(wxInputStream& stream)
{
- stream.SeekI(0);
- unsigned char hdr[4];
- if ( !stream.Read(hdr, WXSIZEOF(hdr)) )
- return false;
-
- // hdr[2] is one for an icon and two for a cursor
- return hdr[0] == '\0' && hdr[1] == '\0' && hdr[2] == '\2' && hdr[3] == '\0';
+ return CanReadICOOrCUR(&stream, 2 /*for identifying a cursor*/);
}
#endif // wxUSE_STREAMS
#if wxUSE_STREAMS
bool wxANIHandler::LoadFile(wxImage *image, wxInputStream& stream,
- bool verbose, int index)
+ bool WXUNUSED(verbose), int index)
{
- wxInt32 FCC1, FCC2;
- wxUint32 datalen;
-
- wxInt32 riff32;
- memcpy( &riff32, "RIFF", 4 );
- wxInt32 list32;
- memcpy( &list32, "LIST", 4 );
- wxInt32 ico32;
- memcpy( &ico32, "icon", 4 );
- int iIcon = 0;
-
- stream.SeekI(0);
- stream.Read(&FCC1, 4);
- if ( FCC1 != riff32 )
+ wxANIDecoder decoder;
+ if (!decoder.Load(stream))
return false;
- // we have a riff file:
- while (stream.IsOk())
- {
- // we always have a data size
- stream.Read(&datalen, 4);
- datalen = wxINT32_SWAP_ON_BE(datalen) ;
- //data should be padded to make even number of bytes
- if (datalen % 2 == 1) datalen ++ ;
- //now either data or a FCC
- if ( (FCC1 == riff32) || (FCC1 == list32) )
- {
- stream.Read(&FCC2, 4);
- }
- else
- {
- if (FCC1 == ico32 && iIcon >= index)
- {
- return DoLoadFile(image, stream, verbose, -1);
- }
- else
- {
- stream.SeekI(stream.TellI() + datalen);
- if ( FCC1 == ico32 )
- iIcon ++;
- }
- }
-
- // try to read next data chunk:
- stream.Read(&FCC1, 4);
- }
- return false;
+ return decoder.ConvertToImage(index != -1 ? (size_t)index : 0, image);
}
bool wxANIHandler::DoCanRead(wxInputStream& stream)
{
- wxInt32 FCC1, FCC2;
- wxUint32 datalen ;
-
- wxInt32 riff32;
- memcpy( &riff32, "RIFF", 4 );
- wxInt32 list32;
- memcpy( &list32, "LIST", 4 );
- wxInt32 ico32;
- memcpy( &ico32, "icon", 4 );
- wxInt32 anih32;
- memcpy( &anih32, "anih", 4 );
-
- stream.SeekI(0);
- if ( !stream.Read(&FCC1, 4) )
- return false;
-
- if ( FCC1 != riff32 )
- return false;
-
- // we have a riff file:
- while ( stream.IsOk() )
- {
- if ( FCC1 == anih32 )
- return true;
- // we always have a data size:
- stream.Read(&datalen, 4);
- datalen = wxINT32_SWAP_ON_BE(datalen) ;
- //data should be padded to make even number of bytes
- if (datalen % 2 == 1) datalen ++ ;
- // now either data or a FCC:
- if ( (FCC1 == riff32) || (FCC1 == list32) )
- {
- stream.Read(&FCC2, 4);
- }
- else
- {
- stream.SeekI(stream.TellI() + datalen);
- }
+ wxANIDecoder decod;
+ return decod.CanRead(stream);
+ // it's ok to modify the stream position here
+}
- // try to read next data chunk:
- if ( !stream.Read(&FCC1, 4) )
- {
- // reading failed -- either EOF or IO error, bail out anyhow
- return false;
- }
- }
+int wxANIHandler::DoGetImageCount(wxInputStream& stream)
+{
+ wxANIDecoder decoder;
+ if (!decoder.Load(stream)) // it's ok to modify the stream position here
+ return wxNOT_FOUND;
- return false;
+ return decoder.GetFrameCount();
}
-int wxANIHandler::GetImageCount(wxInputStream& stream)
+static bool CanReadICOOrCUR(wxInputStream *stream, wxUint16 resourceType)
{
- wxInt32 FCC1, FCC2;
- wxUint32 datalen ;
-
- wxInt32 riff32;
- memcpy( &riff32, "RIFF", 4 );
- wxInt32 list32;
- memcpy( &list32, "LIST", 4 );
- wxInt32 ico32;
- memcpy( &ico32, "icon", 4 );
- wxInt32 anih32;
- memcpy( &anih32, "anih", 4 );
-
- stream.SeekI(0);
- stream.Read(&FCC1, 4);
- if ( FCC1 != riff32 )
- return wxNOT_FOUND;
+ // It's ok to modify the stream position in this function.
- // we have a riff file:
- while ( stream.IsOk() )
+ if ( stream->IsSeekable() && stream->SeekI(0) == wxInvalidOffset )
{
- // we always have a data size:
- stream.Read(&datalen, 4);
- datalen = wxINT32_SWAP_ON_BE(datalen) ;
- //data should be padded to make even number of bytes
- if (datalen % 2 == 1) datalen ++ ;
- // now either data or a FCC:
- if ( (FCC1 == riff32) || (FCC1 == list32) )
- {
- stream.Read(&FCC2, 4);
- }
- else
- {
- if ( FCC1 == anih32 )
- {
- wxUint32 *pData = new wxUint32[datalen/4];
- stream.Read(pData, datalen);
- int nIcons = wxINT32_SWAP_ON_BE(*(pData + 1));
- delete[] pData;
- return nIcons;
- }
- else
- stream.SeekI(stream.TellI() + datalen);
- }
+ return false;
+ }
- // try to read next data chunk:
- stream.Read(&FCC1, 4);
+ ICONDIR iconDir;
+ if ( !stream->Read(&iconDir, sizeof(iconDir)) )
+ {
+ return false;
}
- return wxNOT_FOUND;
+ return !iconDir.idReserved // reserved, must be 0
+ && wxUINT16_SWAP_ON_BE(iconDir.idType) == resourceType // either 1 or 2
+ && iconDir.idCount; // must contain at least one image
}
#endif // wxUSE_STREAMS
projects / wxWidgets.git / blobdiff