-/*
- * Program: image
- *
- * Author: Robert Roebling
- *
- * Copyright: (C) 1998, Robert Roebling
- *
- */
+///////////////////////////////////////////////////////////////////////////////
+// Name: samples/image/image.cpp
+// Purpose: sample showing operations with wxImage
+// Author: Robert Roebling
+// Modified by:
+// Created: 1998
+// RCS-ID: $Id$
+// Copyright: (c) 1998-2005 Robert Roebling
+// License: wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
// For compilers that support precompilation, includes "wx/wx.h".
#include "wx/wxprec.h"
#include "wx/image.h"
#include "wx/file.h"
+#include "wx/filename.h"
#include "wx/mstream.h"
#include "wx/wfstream.h"
#include "wx/quantize.h"
};
-const int nChoices = 8 ;
-static const wxString bppchoices[nChoices] =
-{
- _T("1 bpp color"),
- _T("1 bpp B&W"),
- _T("4 bpp color"),
- _T("8 bpp color"),
- _T("8 bpp greyscale"),
- _T("8 bpp red"),
- _T("8 bpp own palette"),
- _T("24 bpp")
-};
-
-static const int bppvalues[nChoices] =
-{
- wxBMP_1BPP,
- wxBMP_1BPP_BW,
- wxBMP_4BPP,
- wxBMP_8BPP,
- wxBMP_8BPP_GREY,
- wxBMP_8BPP_RED,
- wxBMP_8BPP_PALETTE,
- wxBMP_24BPP
-};
-
// MyFrame
{
wxImage image = m_bitmap.ConvertToImage();
- int bppselection = wxGetSingleChoiceIndex(_T("Set BMP BPP"),
- _T("Set BMP BPP"),
- nChoices,
- bppchoices,
- this);
- if ( bppselection == -1 )
- {
- // cancelled
- return;
- }
-
- image.SetOption(wxIMAGE_OPTION_BMP_FORMAT, bppvalues[bppselection]);
-
- wxString deffilename = bppchoices[bppselection];
- deffilename.Replace(wxT(" "), wxT("_"));
- deffilename += wxT(".bmp");
wxString savefilename = wxFileSelector( wxT("Save Image"),
wxT(""),
- deffilename,
+ wxT(""),
(const wxChar *)NULL,
wxT("BMP files (*.bmp)|*.bmp|")
wxT("PNG files (*.png)|*.png|")
if ( savefilename.empty() )
return;
- if ( image.GetOptionInt(wxIMAGE_OPTION_BMP_FORMAT) == wxBMP_8BPP_PALETTE )
- {
- unsigned char *cmap = new unsigned char [256];
- for ( int i = 0; i < 256; i++ )
- cmap[i] = (unsigned char)i;
- image.SetPalette(wxPalette(256, cmap, cmap, cmap));
+ wxString extension;
+ wxFileName::SplitPath(savefilename, NULL, NULL, &extension);
- delete cmap;
+ bool saved = false;
+ if ( extension == _T("bpp") )
+ {
+ static const int bppvalues[] =
+ {
+ wxBMP_1BPP,
+ wxBMP_1BPP_BW,
+ wxBMP_4BPP,
+ wxBMP_8BPP,
+ wxBMP_8BPP_GREY,
+ wxBMP_8BPP_RED,
+ wxBMP_8BPP_PALETTE,
+ wxBMP_24BPP
+ };
+
+ const wxString bppchoices[] =
+ {
+ _T("1 bpp color"),
+ _T("1 bpp B&W"),
+ _T("4 bpp color"),
+ _T("8 bpp color"),
+ _T("8 bpp greyscale"),
+ _T("8 bpp red"),
+ _T("8 bpp own palette"),
+ _T("24 bpp")
+ };
+
+ int bppselection = wxGetSingleChoiceIndex(_T("Set BMP BPP"),
+ _T("Image sample: save file"),
+ WXSIZEOF(bppchoices),
+ bppchoices,
+ this);
+ if ( bppselection != -1 )
+ {
+ int format = bppvalues[bppselection];
+ image.SetOption(wxIMAGE_OPTION_BMP_FORMAT, format);
+
+ if ( format == wxBMP_8BPP_PALETTE )
+ {
+ unsigned char *cmap = new unsigned char [256];
+ for ( int i = 0; i < 256; i++ )
+ cmap[i] = (unsigned char)i;
+ image.SetPalette(wxPalette(256, cmap, cmap, cmap));
+
+ delete cmap;
+ }
+ }
}
-
- bool loaded;
- wxString extension = savefilename.AfterLast('.').Lower();
-
- if (extension == _T("cur"))
+ else if ( extension == _T("png") )
+ {
+ static const int pngvalues[] =
+ {
+ wxPNG_TYPE_COLOUR,
+ wxPNG_TYPE_COLOUR,
+ wxPNG_TYPE_GREY,
+ wxPNG_TYPE_GREY,
+ wxPNG_TYPE_GREY_RED,
+ wxPNG_TYPE_GREY_RED,
+ };
+
+ const wxString pngchoices[] =
+ {
+ _T("Colour 8bpp"),
+ _T("Colour 16bpp"),
+ _T("Grey 8bpp"),
+ _T("Grey 16bpp"),
+ _T("Grey red 8bpp"),
+ _T("Grey red 16bpp"),
+ };
+
+ int sel = wxGetSingleChoiceIndex(_T("Set PNG format"),
+ _T("Image sample: save file"),
+ WXSIZEOF(pngchoices),
+ pngchoices,
+ this);
+ if ( sel != -1 )
+ {
+ image.SetOption(wxIMAGE_OPTION_PNG_FORMAT, pngvalues[sel]);
+ image.SetOption(wxIMAGE_OPTION_PNG_BITDEPTH, sel % 2 ? 16 : 8);
+ }
+ }
+ else if ( extension == _T("cur") )
{
image.Rescale(32,32);
image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X, 0);
image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y, 0);
// This shows how you can save an image with explicitly
// specified image format:
- loaded = image.SaveFile(savefilename, wxBITMAP_TYPE_CUR);
+ saved = image.SaveFile(savefilename, wxBITMAP_TYPE_CUR);
}
- else
+
+ if ( !saved )
{
// This one guesses image format from filename extension
// (it may fail if the extension is not recognized):
- loaded = image.SaveFile(savefilename);
+ image.SaveFile(savefilename);
}
-
- if ( !loaded )
- wxMessageBox(_T("No handler for this file type."),
- _T("File was not saved"),
- wxOK|wxCENTRE, this);
}
private:
return;
}
-// data.UseAlpha();
+ data.UseAlpha();
Data::Iterator p(data);
for ( int x = 0; x < REAL_SIZE; ++x )
{
- p.Red() = r;
- p.Green() = g;
- p.Blue() = b;
- p.Alpha() = (Data::Iterator::ChannelType)((x*255.)/REAL_SIZE);
+ // note that RGB must be premultiplied by alpha
+ unsigned a = (Data::Iterator::ChannelType)((x*255.)/REAL_SIZE);
+ p.Red() = r * a / 256;
+ p.Green() = g * a / 256;
+ p.Blue() = b * a / 256;
+ p.Alpha() = a;
++p; // same as p.OffsetX(1)
}
projects / wxWidgets.git / blobdiff