#include "wx/module.h"
#include "wx/palette.h"
#include "wx/intl.h"
+ #include "wx/colour.h"
#endif
#include "wx/filefn.h"
#endif
//-----------------------------------------------------------------------------
-// wxImage
+// global data
+//-----------------------------------------------------------------------------
+
+wxList wxImage::sm_handlers;
+wxImage wxNullImage;
+
+//-----------------------------------------------------------------------------
+// wxImageRefData
//-----------------------------------------------------------------------------
class wxImageRefData: public wxObjectRefData
wxArrayString m_optionNames;
wxArrayString m_optionValues;
- DECLARE_NO_COPY_CLASS(wxImageRefData)
+ wxDECLARE_NO_COPY_CLASS(wxImageRefData);
};
wxImageRefData::wxImageRefData()
free( m_alpha );
}
-wxList wxImage::sm_handlers;
-
-wxImage wxNullImage;
+//-----------------------------------------------------------------------------
+// wxImage
//-----------------------------------------------------------------------------
#define M_IMGDATA static_cast<wxImageRefData*>(m_refData)
IMPLEMENT_DYNAMIC_CLASS(wxImage, wxObject)
-wxImage::wxImage( int width, int height, bool clear )
-{
- Create( width, height, clear );
-}
-
-wxImage::wxImage( int width, int height, unsigned char* data, bool static_data )
-{
- Create( width, height, data, static_data );
-}
-
-wxImage::wxImage( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data )
-{
- Create( width, height, data, alpha, static_data );
-}
-
-wxImage::wxImage( const wxString& name, wxBitmapType type, int index )
-{
- LoadFile( name, type, index );
-}
-
-wxImage::wxImage( const wxString& name, const wxString& mimetype, int index )
-{
- LoadFile( name, mimetype, index );
-}
-
-#if wxUSE_STREAMS
-wxImage::wxImage( wxInputStream& stream, wxBitmapType type, int index )
-{
- LoadFile( stream, type, index );
-}
-
-wxImage::wxImage( wxInputStream& stream, const wxString& mimetype, int index )
-{
- LoadFile( stream, mimetype, index );
-}
-#endif // wxUSE_STREAMS
-
-wxImage::wxImage(const char* const* xpmData)
-{
- Create(xpmData);
-}
-
bool wxImage::Create(const char* const* xpmData)
{
#if wxUSE_XPM
return false;
}
- if (clear)
- memset(M_IMGDATA->m_data, 0, width*height*3);
-
M_IMGDATA->m_width = width;
M_IMGDATA->m_height = height;
M_IMGDATA->m_ok = true;
+ if (clear)
+ {
+ Clear();
+ }
+
return true;
}
{
UnRef();
- wxCHECK_MSG( data, false, _T("NULL data in wxImage::Create") );
+ wxCHECK_MSG( data, false, wxT("NULL data in wxImage::Create") );
m_refData = new wxImageRefData();
{
UnRef();
- wxCHECK_MSG( data, false, _T("NULL data in wxImage::Create") );
+ wxCHECK_MSG( data, false, wxT("NULL data in wxImage::Create") );
m_refData = new wxImageRefData();
M_IMGDATA->m_height = height;
M_IMGDATA->m_ok = true;
M_IMGDATA->m_static = static_data;
+ M_IMGDATA->m_staticAlpha = static_data;
return true;
}
UnRef();
}
+void wxImage::Clear(unsigned char value)
+{
+ memset(M_IMGDATA->m_data, value, M_IMGDATA->m_width*M_IMGDATA->m_height*3);
+}
+
wxObjectRefData* wxImage::CreateRefData() const
{
return new wxImageRefData;
return image;
}
-wxImage wxImage::Scale( int width, int height, int quality ) const
+wxImage
+wxImage::Scale( int width, int height, wxImageResizeQuality quality ) const
{
wxImage image;
if ( old_width == width && old_height == height )
return *this;
- // Scale the image (...or more appropriately, resample the image) using
- // either the high-quality or normal method as specified
- if ( quality == wxIMAGE_QUALITY_HIGH )
- {
- // We need to check whether we are downsampling or upsampling the image
- if ( width < old_width && height < old_height )
- {
- // Downsample the image using the box averaging method for best results
- image = ResampleBox(width, height);
- }
- else
- {
- // For upsampling or other random/wierd image dimensions we'll use
- // a bicubic b-spline scaling method
- image = ResampleBicubic(width, height);
- }
- }
- else // Default scaling method == simple pixel replication
- {
- if ( old_width % width == 0 && old_width >= width &&
- old_height % height == 0 && old_height >= height )
- {
- return ShrinkBy( old_width / width , old_height / height ) ;
- }
- image.Create( width, height, false );
-
- unsigned char *data = image.GetData();
-
- wxCHECK_MSG( data, image, wxT("unable to create image") );
-
- unsigned char *source_data = M_IMGDATA->m_data;
- unsigned char *target_data = data;
- unsigned char *source_alpha = 0 ;
- unsigned char *target_alpha = 0 ;
-
- if ( !M_IMGDATA->m_hasMask )
- {
- source_alpha = M_IMGDATA->m_alpha ;
- if ( source_alpha )
- {
- image.SetAlpha() ;
- target_alpha = image.GetAlpha() ;
- }
- }
-
- long x_delta = (old_width<<16) / width;
- long y_delta = (old_height<<16) / height;
-
- unsigned char* dest_pixel = target_data;
-
- long y = 0;
- for ( long j = 0; j < height; j++ )
- {
- unsigned char* src_line = &source_data[(y>>16)*old_width*3];
- unsigned char* src_alpha_line = source_alpha ? &source_alpha[(y>>16)*old_width] : 0 ;
-
- long x = 0;
- for ( long i = 0; i < width; i++ )
+ // resample the image using either the nearest neighbourhood, bilinear or
+ // bicubic method as specified
+ switch ( quality )
+ {
+ case wxIMAGE_QUALITY_BICUBIC:
+ case wxIMAGE_QUALITY_BILINEAR:
+ // both of these algorithms should be used for up-sampling the
+ // image only, when down-sampling always use box averaging for best
+ // results
+ if ( width < old_width && height < old_height )
+ image = ResampleBox(width, height);
+ else if ( quality == wxIMAGE_QUALITY_BILINEAR )
+ image = ResampleBilinear(width, height);
+ else if ( quality == wxIMAGE_QUALITY_BICUBIC )
+ image = ResampleBicubic(width, height);
+ break;
+
+ case wxIMAGE_QUALITY_NEAREST:
+ if ( old_width % width == 0 && old_width >= width &&
+ old_height % height == 0 && old_height >= height )
{
- unsigned char* src_pixel = &src_line[(x>>16)*3];
- unsigned char* src_alpha_pixel = source_alpha ? &src_alpha_line[(x>>16)] : 0 ;
- dest_pixel[0] = src_pixel[0];
- dest_pixel[1] = src_pixel[1];
- dest_pixel[2] = src_pixel[2];
- dest_pixel += 3;
- if ( source_alpha )
- *(target_alpha++) = *src_alpha_pixel ;
- x += x_delta;
+ return ShrinkBy( old_width / width , old_height / height );
}
- y += y_delta;
- }
+ image = ResampleNearest(width, height);
+ break;
}
// If the original image has a mask, apply the mask to the new image
return image;
}
+wxImage wxImage::ResampleNearest(int width, int height) const
+{
+ wxImage image;
+ image.Create( width, height, false );
+
+ unsigned char *data = image.GetData();
+
+ wxCHECK_MSG( data, image, wxT("unable to create image") );
+
+ unsigned char *source_data = M_IMGDATA->m_data;
+ unsigned char *target_data = data;
+ unsigned char *source_alpha = 0 ;
+ unsigned char *target_alpha = 0 ;
+
+ if ( !M_IMGDATA->m_hasMask )
+ {
+ source_alpha = M_IMGDATA->m_alpha ;
+ if ( source_alpha )
+ {
+ image.SetAlpha() ;
+ target_alpha = image.GetAlpha() ;
+ }
+ }
+
+ long old_height = M_IMGDATA->m_height,
+ old_width = M_IMGDATA->m_width;
+ long x_delta = (old_width<<16) / width;
+ long y_delta = (old_height<<16) / height;
+
+ unsigned char* dest_pixel = target_data;
+
+ long y = 0;
+ for ( long j = 0; j < height; j++ )
+ {
+ unsigned char* src_line = &source_data[(y>>16)*old_width*3];
+ unsigned char* src_alpha_line = source_alpha ? &source_alpha[(y>>16)*old_width] : 0 ;
+
+ long x = 0;
+ for ( long i = 0; i < width; i++ )
+ {
+ unsigned char* src_pixel = &src_line[(x>>16)*3];
+ unsigned char* src_alpha_pixel = source_alpha ? &src_alpha_line[(x>>16)] : 0 ;
+ dest_pixel[0] = src_pixel[0];
+ dest_pixel[1] = src_pixel[1];
+ dest_pixel[2] = src_pixel[2];
+ dest_pixel += 3;
+ if ( source_alpha )
+ *(target_alpha++) = *src_alpha_pixel ;
+ x += x_delta;
+ }
+
+ y += y_delta;
+ }
+
+ return image;
+}
+
wxImage wxImage::ResampleBox(int width, int height) const
{
// This function implements a simple pre-blur/box averaging method for
return ret_image;
}
+wxImage wxImage::ResampleBilinear(int width, int height) const
+{
+ // This function implements a Bilinear algorithm for resampling.
+ wxImage ret_image(width, height, false);
+ unsigned char* src_data = M_IMGDATA->m_data;
+ unsigned char* src_alpha = M_IMGDATA->m_alpha;
+ unsigned char* dst_data = ret_image.GetData();
+ unsigned char* dst_alpha = NULL;
+
+ if ( src_alpha )
+ {
+ ret_image.SetAlpha();
+ dst_alpha = ret_image.GetAlpha();
+ }
+ double HFactor = double(M_IMGDATA->m_height) / height;
+ double WFactor = double(M_IMGDATA->m_width) / width;
+
+ int srcpixymax = M_IMGDATA->m_height - 1;
+ int srcpixxmax = M_IMGDATA->m_width - 1;
+
+ double srcpixy, srcpixy1, srcpixy2, dy, dy1;
+ double srcpixx, srcpixx1, srcpixx2, dx, dx1;
+
+ // initialize alpha values to avoid g++ warnings about possibly
+ // uninitialized variables
+ double r1, g1, b1, a1 = 0;
+ double r2, g2, b2, a2 = 0;
+
+ for ( int dsty = 0; dsty < height; dsty++ )
+ {
+ // We need to calculate the source pixel to interpolate from - Y-axis
+ srcpixy = double(dsty) * HFactor;
+ srcpixy1 = int(srcpixy);
+ srcpixy2 = ( srcpixy1 == srcpixymax ) ? srcpixy1 : srcpixy1 + 1.0;
+ dy = srcpixy - (int)srcpixy;
+ dy1 = 1.0 - dy;
+
+
+ for ( int dstx = 0; dstx < width; dstx++ )
+ {
+ // X-axis of pixel to interpolate from
+ srcpixx = double(dstx) * WFactor;
+ srcpixx1 = int(srcpixx);
+ srcpixx2 = ( srcpixx1 == srcpixxmax ) ? srcpixx1 : srcpixx1 + 1.0;
+ dx = srcpixx - (int)srcpixx;
+ dx1 = 1.0 - dx;
+
+ int x_offset1 = srcpixx1 < 0.0 ? 0 : srcpixx1 > srcpixxmax ? srcpixxmax : (int)srcpixx1;
+ int x_offset2 = srcpixx2 < 0.0 ? 0 : srcpixx2 > srcpixxmax ? srcpixxmax : (int)srcpixx2;
+ int y_offset1 = srcpixy1 < 0.0 ? 0 : srcpixy1 > srcpixymax ? srcpixymax : (int)srcpixy1;
+ int y_offset2 = srcpixy2 < 0.0 ? 0 : srcpixy2 > srcpixymax ? srcpixymax : (int)srcpixy2;
+
+ int src_pixel_index00 = y_offset1 * M_IMGDATA->m_width + x_offset1;
+ int src_pixel_index01 = y_offset1 * M_IMGDATA->m_width + x_offset2;
+ int src_pixel_index10 = y_offset2 * M_IMGDATA->m_width + x_offset1;
+ int src_pixel_index11 = y_offset2 * M_IMGDATA->m_width + x_offset2;
+
+ //first line
+ r1 = src_data[src_pixel_index00 * 3 + 0] * dx1 + src_data[src_pixel_index01 * 3 + 0] * dx;
+ g1 = src_data[src_pixel_index00 * 3 + 1] * dx1 + src_data[src_pixel_index01 * 3 + 1] * dx;
+ b1 = src_data[src_pixel_index00 * 3 + 2] * dx1 + src_data[src_pixel_index01 * 3 + 2] * dx;
+ if ( src_alpha )
+ a1 = src_alpha[src_pixel_index00] * dx1 + src_alpha[src_pixel_index01] * dx;
+
+ //second line
+ r2 = src_data[src_pixel_index10 * 3 + 0] * dx1 + src_data[src_pixel_index11 * 3 + 0] * dx;
+ g2 = src_data[src_pixel_index10 * 3 + 1] * dx1 + src_data[src_pixel_index11 * 3 + 1] * dx;
+ b2 = src_data[src_pixel_index10 * 3 + 2] * dx1 + src_data[src_pixel_index11 * 3 + 2] * dx;
+ if ( src_alpha )
+ a2 = src_alpha[src_pixel_index10] * dx1 + src_alpha[src_pixel_index11] * dx;
+
+ //result lines
+
+ dst_data[0] = static_cast<unsigned char>(r1 * dy1 + r2 * dy);
+ dst_data[1] = static_cast<unsigned char>(g1 * dy1 + g2 * dy);
+ dst_data[2] = static_cast<unsigned char>(b1 * dy1 + b2 * dy);
+ dst_data += 3;
+
+ if ( src_alpha )
+ *dst_alpha++ = static_cast<unsigned char>(a1 * dy1 + a2 * dy);
+ }
+ }
+
+ return ret_image;
+}
+
// The following two local functions are for the B-spline weighting of the
// bicubic sampling algorithm
static inline double spline_cube(double value)
image.SetRGB(wxRect(), r, g, b);
- wxRect subRect(pos.x, pos.y, width, height);
- wxRect finalRect(0, 0, size.GetWidth(), size.GetHeight());
- if (pos.x < 0)
- finalRect.width -= pos.x;
- if (pos.y < 0)
- finalRect.height -= pos.y;
+ // we have two coordinate systems:
+ // source: starting at 0,0 of source image
+ // destination starting at 0,0 of destination image
+ // Documentation says:
+ // "The image is pasted into a new image [...] at the position pos relative
+ // to the upper left of the new image." this means the transition rule is:
+ // "dest coord" = "source coord" + pos;
+
+ // calculate the intersection using source coordinates:
+ wxRect srcRect(0, 0, width, height);
+ wxRect dstRect(-pos, size);
- subRect.Intersect(finalRect);
+ srcRect.Intersect(dstRect);
- if (!subRect.IsEmpty())
+ if (!srcRect.IsEmpty())
{
- if ((subRect.GetWidth() == width) && (subRect.GetHeight() == height))
- image.Paste(*this, pos.x, pos.y);
+ // insertion point is needed in destination coordinates.
+ // NB: it is not always "pos"!
+ wxPoint ptInsert = srcRect.GetTopLeft() + pos;
+
+ if ((srcRect.GetWidth() == width) && (srcRect.GetHeight() == height))
+ image.Paste(*this, ptInsert.x, ptInsert.y);
else
- image.Paste(GetSubImage(subRect), pos.x, pos.y);
+ image.Paste(GetSubImage(srcRect), ptInsert.x, ptInsert.y);
}
return image;
}
}
-wxImage wxImage::ConvertToGreyscale( double lr, double lg, double lb ) const
+wxImage wxImage::ConvertToGreyscale(void) const
+{
+ return ConvertToGreyscale(0.299, 0.587, 0.114);
+}
+
+wxImage wxImage::ConvertToGreyscale(double weight_r, double weight_g, double weight_b) const
{
wxImage image;
const long size = M_IMGDATA->m_width * M_IMGDATA->m_height;
for ( long i = 0; i < size; i++, src += 3, dest += 3 )
{
+ memcpy(dest, src, 3);
// don't modify the mask
if ( hasMask && src[0] == maskRed && src[1] == maskGreen && src[2] == maskBlue )
{
- memcpy(dest, src, 3);
}
else
{
- // calculate the luma
- double luma = (src[0] * lr + src[1] * lg + src[2] * lb) + 0.5;
- dest[0] = dest[1] = dest[2] = static_cast<unsigned char>(luma);
+ wxColour::MakeGrey(dest + 0, dest + 1, dest + 2, weight_r, weight_g, weight_b);
}
}
for ( long i = 0; i < size; i++, srcd += 3, tard += 3 )
{
- if (srcd[0] == r && srcd[1] == g && srcd[2] == b)
- tard[0] = tard[1] = tard[2] = 255;
- else
- tard[0] = tard[1] = tard[2] = 0;
+ bool on = (srcd[0] == r) && (srcd[1] == g) && (srcd[2] == b);
+ wxColourBase::MakeMono(tard + 0, tard + 1, tard + 2, on);
}
return image;
}
+wxImage wxImage::ConvertToDisabled(unsigned char brightness) const
+{
+ wxImage image = *this;
+
+ unsigned char mr = image.GetMaskRed();
+ unsigned char mg = image.GetMaskGreen();
+ unsigned char mb = image.GetMaskBlue();
+
+ int width = image.GetWidth();
+ int height = image.GetHeight();
+ bool has_mask = image.HasMask();
+
+ for (int y = height-1; y >= 0; --y)
+ {
+ for (int x = width-1; x >= 0; --x)
+ {
+ unsigned char* data = image.GetData() + (y*(width*3))+(x*3);
+ unsigned char* r = data;
+ unsigned char* g = data+1;
+ unsigned char* b = data+2;
+
+ if (has_mask && (*r == mr) && (*g == mg) && (*b == mb))
+ continue;
+
+ wxColour::MakeDisabled(r, g, b, brightness);
+ }
+ }
+ return image;
+}
+
int wxImage::GetWidth() const
{
wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
}
}
+void wxImage::ClearAlpha()
+{
+ wxCHECK_RET( HasAlpha(), wxT("image already doesn't have an alpha channel") );
+
+ if ( !M_IMGDATA->m_staticAlpha )
+ free( M_IMGDATA->m_alpha );
+
+ M_IMGDATA->m_alpha = NULL;
+}
+
+
// ----------------------------------------------------------------------------
// mask support
// ----------------------------------------------------------------------------
bool wxImage::ConvertAlphaToMask(unsigned char threshold)
{
- if (!HasAlpha())
+ if ( !HasAlpha() )
return true;
unsigned char mr, mg, mb;
- if (!FindFirstUnusedColour(&mr, &mg, &mb))
+ if ( !FindFirstUnusedColour(&mr, &mg, &mb) )
{
wxLogError( _("No unused colour in image being masked.") );
return false;
}
+ ConvertAlphaToMask(mr, mg, mb, threshold);
+ return true;
+}
+
+void wxImage::ConvertAlphaToMask(unsigned char mr,
+ unsigned char mg,
+ unsigned char mb,
+ unsigned char threshold)
+{
+ if ( !HasAlpha() )
+ return;
+
AllocExclusive();
SetMask(true);
}
}
- if( !M_IMGDATA->m_staticAlpha )
+ if ( !M_IMGDATA->m_staticAlpha )
free(M_IMGDATA->m_alpha);
M_IMGDATA->m_alpha = NULL;
M_IMGDATA->m_staticAlpha = false;
-
- return true;
}
// ----------------------------------------------------------------------------
void wxImage::SetOption(const wxString& name, const wxString& value)
{
- wxCHECK_RET( Ok(), wxT("invalid image") );
-
AllocExclusive();
int idx = M_IMGDATA->m_optionNames.Index(name, false);
- if (idx == wxNOT_FOUND)
+ if ( idx == wxNOT_FOUND )
{
M_IMGDATA->m_optionNames.Add(name);
M_IMGDATA->m_optionValues.Add(value);
wxString wxImage::GetOption(const wxString& name) const
{
- wxCHECK_MSG( Ok(), wxEmptyString, wxT("invalid image") );
+ if ( !M_IMGDATA )
+ return wxEmptyString;
int idx = M_IMGDATA->m_optionNames.Index(name, false);
- if (idx == wxNOT_FOUND)
+ if ( idx == wxNOT_FOUND )
return wxEmptyString;
else
return M_IMGDATA->m_optionValues[idx];
bool wxImage::HasOption(const wxString& name) const
{
- wxCHECK_MSG( Ok(), false, wxT("invalid image") );
-
- return (M_IMGDATA->m_optionNames.Index(name, false) != wxNOT_FOUND);
+ return M_IMGDATA ? M_IMGDATA->m_optionNames.Index(name, false) != wxNOT_FOUND
+ : false;
}
// ----------------------------------------------------------------------------
bool wxImage::DoLoad(wxImageHandler& handler, wxInputStream& stream, int index)
{
+ // save the options values which can be clobbered by the handler (e.g. many
+ // of them call Destroy() before trying to load the file)
+ const unsigned maxWidth = GetOptionInt(wxIMAGE_OPTION_MAX_WIDTH),
+ maxHeight = GetOptionInt(wxIMAGE_OPTION_MAX_HEIGHT);
+
if ( !handler.LoadFile(this, stream, true/*verbose*/, index) )
return false;
+ // rescale the image to the specified size if needed
+ if ( maxWidth || maxHeight )
+ {
+ const unsigned widthOrig = GetWidth(),
+ heightOrig = GetHeight();
+
+ // this uses the same (trivial) algorithm as the JPEG handler
+ unsigned width = widthOrig,
+ height = heightOrig;
+ while ( (maxWidth && width > maxWidth) ||
+ (maxHeight && height > maxHeight) )
+ {
+ width /= 2;
+ height /= 2;
+ }
+
+ if ( width != widthOrig || height != heightOrig )
+ Rescale(width, height, wxIMAGE_QUALITY_HIGH);
+ }
+
+ // Set this after Rescale, which currently does not preserve it
M_IMGDATA->m_type = handler.GetType();
+
return true;
}
bool wxImage::LoadFile( wxInputStream& stream, wxBitmapType type, int index )
{
- UnRef();
-
- m_refData = new wxImageRefData;
+ AllocExclusive();
wxImageHandler *handler;
// may) we should probably refcount the duplicates.
// also an issue in InsertHandler below.
- wxLogDebug( _T("Adding duplicate image handler for '%s'"),
+ wxLogDebug( wxT("Adding duplicate image handler for '%s'"),
handler->GetName().c_str() );
delete handler;
}
else
{
// see AddHandler for additional comments.
- wxLogDebug( _T("Inserting duplicate image handler for '%s'"),
+ wxLogDebug( wxT("Inserting duplicate image handler for '%s'"),
handler->GetName().c_str() );
delete handler;
}
while (node)
{
wxImageHandler *handler = (wxImageHandler*)node->GetData();
- if ( (handler->GetExtension().Cmp(extension) == 0) &&
- ( (bitmapType == wxBITMAP_TYPE_ANY) || (handler->GetType() == bitmapType)) )
+ if ((bitmapType == wxBITMAP_TYPE_ANY) || (handler->GetType() == bitmapType))
{
- return handler;
+ if (handler->GetExtension() == extension)
+ return handler;
+ if (handler->GetAltExtensions().Index(extension, false) != wxNOT_FOUND)
+ return handler;
}
node = node->GetNext();
}
{
wxImageHandler* Handler = (wxImageHandler*)Node->GetData();
fmts += wxT("*.") + Handler->GetExtension();
+ for (size_t i = 0; i < Handler->GetAltExtensions().size(); i++)
+ fmts += wxT(";*.") + Handler->GetAltExtensions()[i];
Node = Node->GetNext();
if ( Node ) fmts += wxT(";");
}
IMPLEMENT_ABSTRACT_CLASS(wxImageHandler,wxObject)
#if wxUSE_STREAMS
-bool wxImageHandler::LoadFile( wxImage *WXUNUSED(image), wxInputStream& WXUNUSED(stream), bool WXUNUSED(verbose), int WXUNUSED(index) )
+int wxImageHandler::GetImageCount( wxInputStream& stream )
{
- return false;
-}
+ // NOTE: this code is the same of wxAnimationDecoder::CanRead and
+ // wxImageHandler::CallDoCanRead
-bool wxImageHandler::SaveFile( wxImage *WXUNUSED(image), wxOutputStream& WXUNUSED(stream), bool WXUNUSED(verbose) )
-{
- return false;
-}
+ if ( !stream.IsSeekable() )
+ return false; // can't test unseekable stream
-int wxImageHandler::GetImageCount( wxInputStream& WXUNUSED(stream) )
-{
- return 1;
+ wxFileOffset posOld = stream.TellI();
+ int n = DoGetImageCount(stream);
+
+ // restore the old position to be able to test other formats and so on
+ if ( stream.SeekI(posOld) == wxInvalidOffset )
+ {
+ wxLogDebug(wxT("Failed to rewind the stream in wxImageHandler!"));
+
+ // reading would fail anyhow as we're not at the right position
+ return false;
+ }
+
+ return n;
}
bool wxImageHandler::CanRead( const wxString& name )
bool wxImageHandler::CallDoCanRead(wxInputStream& stream)
{
- wxFileOffset posOld = stream.TellI();
- if ( posOld == wxInvalidOffset )
- {
- // can't test unseekable stream
- return false;
- }
+ // NOTE: this code is the same of wxAnimationDecoder::CanRead and
+ // wxImageHandler::GetImageCount
+
+ if ( !stream.IsSeekable() )
+ return false; // can't test unseekable stream
+ wxFileOffset posOld = stream.TellI();
bool ok = DoCanRead(stream);
// restore the old position to be able to test other formats and so on
if ( stream.SeekI(posOld) == wxInvalidOffset )
{
- wxLogDebug(_T("Failed to rewind the stream in wxImageHandler!"));
+ wxLogDebug(wxT("Failed to rewind the stream in wxImageHandler!"));
// reading would fail anyhow as we're not at the right position
return false;
wxImageResolution
wxImageHandler::GetResolutionFromOptions(const wxImage& image, int *x, int *y)
{
- wxCHECK_MSG( x && y, wxIMAGE_RESOLUTION_NONE, _T("NULL pointer") );
+ wxCHECK_MSG( x && y, wxIMAGE_RESOLUTION_NONE, wxT("NULL pointer") );
if ( image.HasOption(wxIMAGE_OPTION_RESOLUTIONX) &&
image.HasOption(wxIMAGE_OPTION_RESOLUTIONY) )
projects / wxWidgets.git / blobdiff