/////////////////////////////////////////////////////////////////////////////
// Name: wx/msw/dib.h
-// Purpose: Routines for loading and saving DIBs
-// Author: Various
+// Purpose: wxDIB class representing Win32 device independent bitmaps
+// Author: Vadim Zeitlin
// Modified by:
-// Created: 01/02/97
+// Created: 03.03.03 (replaces the old file with the same name)
// RCS-ID: $Id$
-// Copyright: (c) Julian Smart
+// Copyright: (c) 1997-2003 wxWindows team
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
-#ifndef _WX_DIB_H_
-#define _WX_DIB_H_
+#ifndef _WX_MSW_DIB_H_
+#define _WX_MSW_DIB_H_
class WXDLLEXPORT wxBitmap;
class WXDLLEXPORT wxPalette;
-// WARNING: these functions are private to wxWindows and shouldn't be used
-// by the user code, they risk to disappear in the next versions!
+#include "wx/msw/private.h"
+
+// ----------------------------------------------------------------------------
+// wxDIB: represents a DIB section
+// ----------------------------------------------------------------------------
+
+class WXDLLEXPORT wxDIB
+{
+public:
+ // ctors and such
+ // --------------
+
+ // create an uninitialized DIB with the given width, height and depth (only
+ // 24 and 32 bpp DIBs are currently supported)
+ //
+ // after using this ctor, GetData() and GetHandle() may be used if IsOk()
+ // returns true
+ wxDIB(int width, int height, int depth)
+ { Init(); (void)Create(width, height, depth); }
+
+ // same as ctor but with return value
+ bool Create(int width, int height, int depth);
+
+ // dtor is not virtual, this class is not meant to be used polymorphically
+ ~wxDIB()
+ {
+ if ( m_handle && !::DeleteObject(m_handle) )
+ {
+ wxLogLastError(wxT("DeleteObject(hDIB)"));
+ }
+ }
+
+
+ // operations
+ // ----------
+
+ // get the handle from the DIB and reset it, i.e. this object won't destroy
+ // the DIB after this (but the caller should do it)
+ HBITMAP Detach() { HBITMAP hbmp = m_handle; m_handle = 0; return hbmp; }
+
+
+ // accessors
+ // ---------
+
+ // return true if DIB was successfully created, false otherwise
+ bool IsOk() const { return m_handle != 0; }
+
+ // get the bitmap size
+ wxSize GetSize() const { DoGetObject(); return wxSize(m_width, m_height); }
+ int GetWidth() const { DoGetObject(); return m_width; }
+ int GetHeight() const { DoGetObject(); return m_height; }
+
+ // get the number of bits per pixel, or depth
+ int GetDepth() const { DoGetObject(); return m_depth; }
+
+ // get the DIB handle
+ HBITMAP GetHandle() const { return m_handle; }
+
+ // get raw pointer to bitmap bits, you should know what you do if you
+ // decide to use it
+ void *GetData() const { DoGetObject(); return m_data; }
+
+
+ // wxImage conversion
+ // ------------------
+
+#if wxUSE_IMAGE
+ // create a DIB from the given image, the DIB will be either 24 or 32 (if
+ // the image has alpha channel) bpp
+ wxDIB(const wxImage& image) { Init(); (void)Create(image); }
+
+ // same as the above ctor but with the return code
+ bool Create(const wxImage& image);
+
+ // create wxImage having the same data as this DIB
+ wxImage ConvertToImage() const;
+#endif // wxUSE_IMAGE
+
+
+ // helper functions
+ // ----------------
+
+ // return the size of one line in a DIB with given width and depth: the
+ // point here is that as the scan lines need to be DWORD aligned so we may
+ // need to add some padding
+ static unsigned long GetLineSize(int width, int depth)
+ {
+ return ((width*depth + 31) & ~31) >> 3;
+ }
+
+private:
+ // common part of all ctors
+ void Init()
+ {
+ m_handle = 0;
+
+ m_data = NULL;
+
+ m_width =
+ m_height =
+ m_depth = 0;
+ }
+
+ // the DIB section handle, 0 if invalid
+ HBITMAP m_handle;
+
+ // NB: we could store only m_handle and not any of the other fields as
+ // we may always retrieve them from it using ::GetObject(), but we
+ // decide to still store them for efficiency concerns -- however if we
+ // don't have them from the very beginning (e.g. DIB constructed from a
+ // bitmap), we only retrieve them when necessary and so these fields
+ // should *never* be accessed directly, even from inside wxDIB code
+
+ // function which must be called before accessing any members and which
+ // gets their values from m_handle, if not done yet
+ void DoGetObject() const;
+
+ // pointer to DIB bits, may be NULL
+ void *m_data;
+
+ // size and depth of the image
+ int m_width,
+ m_height,
+ m_depth;
+
+
+ // DIBs can't be copied
+ wxDIB(const wxDIB&);
+ wxDIB& operator=(const wxDIB&);
+};
+
// ----------------------------------------------------------------------------
// Functions for working with DIBs
// ----------------------------------------------------------------------------
+// WARNING: these functions are private to wxWindows and shouldn't be used
+// by the user code, they risk to disappear in the next versions!
+
// VZ: we have 3 different sets of functions: from bitmap.cpp (wxCreateDIB and
// wxFreeDIB), from dib.cpp and from dataobj.cpp - surely there is some
// redundancy between them? (FIXME)
LPSTR wxFindDIBBits (LPSTR lpbi);
HPALETTE wxMakeDIBPalette(LPBITMAPINFOHEADER lpInfo);
-#endif // _WX_DIB_H_
+#endif // _WX_MSW_DIB_H_
+///////////////////////////////////////////////////////////////////////////////
+// Name: src/msw/dib.cpp
+// Purpose: implements wxDIB class
+// Author: Vadim Zeitlin
+// Modified by:
+// Created: 03.03.03 (replaces the old file with the same name)
+// RCS-ID: $Id$
+// Copyright: (c) 2003 Vadim Zeitlin <vadim@wxwindows.org>
+// License: wxWindows license
+///////////////////////////////////////////////////////////////////////////////
+
+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
+// For compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"
+
+#ifdef __BORLANDC__
+ #pragma hdrstop
+#endif
+
+#ifndef WX_PRECOMP
+ #include "wx/string.h"
+ #include "wx/log.h"
+#endif //WX_PRECOMP
+
+#include "wx/image.h"
+
+#include "wx/msw/dib.h"
+
+// ============================================================================
+// implementation
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// wxDIB creation
+// ----------------------------------------------------------------------------
+
+bool wxDIB::Create(int width, int height, int depth)
+{
+ // we don't handle the palette yet
+ wxASSERT_MSG( depth == 24 || depth == 32,
+ _T("unsupported image depth in wxDIB::Create()") );
+
+ static const int infosize = sizeof(BITMAPINFOHEADER);
+
+ BITMAPINFO *info = (BITMAPINFO *)malloc(infosize);
+ wxCHECK_MSG( info, NULL, _T("malloc(BITMAPINFO) failed") );
+
+ memset(info, 0, infosize);
+
+ info->bmiHeader.biSize = infosize;
+ info->bmiHeader.biWidth = width;
+ info->bmiHeader.biHeight = -height;
+ info->bmiHeader.biPlanes = 1;
+ info->bmiHeader.biBitCount = depth;
+ info->bmiHeader.biCompression = BI_RGB;
+ info->bmiHeader.biSizeImage = GetLineSize(width, depth)*height;
+
+ // No need to report an error here. If it fails, we just won't use a
+ // file mapping and CreateDIBSection will just allocate memory for us.
+ m_handle = ::CreateDIBSection
+ (
+ 0, // hdc (unused with DIB_RGB_COLORS)
+ info, // bitmap description
+ DIB_RGB_COLORS, // use RGB, not palette
+ &m_data, // [out] DIB bits
+ NULL, // don't use file mapping
+ 0 // file mapping offset (not used here)
+ );
+
+ free(info);
+
+ if ( !m_handle )
+ {
+ wxLogLastError(wxT("CreateDIBSection"));
+
+ return false;
+ }
+
+ m_width = width;
+ m_height = height;
+ m_depth = depth;
+
+ return true;
+}
+
+// ----------------------------------------------------------------------------
+// wxDIB accessors
+// ----------------------------------------------------------------------------
+
+void wxDIB::DoGetObject() const
+{
+ // only do something if we have a valid DIB but we don't [yet] have valid
+ // data
+ if ( m_handle && !m_data )
+ {
+ // although all the info we need is in BITMAP and so we don't really
+ // need DIBSECTION we still ask for it as modifying the bit values only
+ // works for the real DIBs and not for the bitmaps and it's better to
+ // check for this now rather than trying to find out why it doesn't
+ // work later
+ DIBSECTION ds;
+ if ( !::GetObject(m_handle, sizeof(ds), &ds) )
+ {
+ wxLogLastError(_T("GetObject(hDIB)"));
+
+ return;
+ }
+
+ wxDIB *self = wxConstCast(this, wxDIB);
+
+ self->m_width = ds.dsBm.bmWidth;
+ self->m_height = ds.dsBm.bmHeight;
+ self->m_depth = ds.dsBm.bmBitsPixel;
+ self->m_data = ds.dsBm.bmBits;
+ }
+}
+
+// ----------------------------------------------------------------------------
+// wxImage support
+// ----------------------------------------------------------------------------
+
+#if wxUSE_IMAGE
+
+bool wxDIB::Create(const wxImage& image)
+{
+ wxCHECK_MSG( image.Ok(), false, _T("invalid wxImage in wxDIB ctor") );
+
+ const int h = image.GetHeight();
+ const int w = image.GetWidth();
+
+ // if we have alpha channel, we need to create a 32bpp RGBA DIB, otherwise
+ // a 24bpp RGB is sufficient
+ const bool hasAlpha = image.HasAlpha();
+ const int bpp = hasAlpha ? 32 : 24;
+
+ if ( !Create(w, h, bpp) )
+ return false;
+
+ // DIBs are stored in bottom to top order so we need to copy bits line by
+ // line and starting from the end
+ const int srcBytesPerLine = w * 3;
+ const int dstBytesPerLine = GetLineSize(w, bpp);
+ const unsigned char *src = image.GetData() + ((h - 1) * srcBytesPerLine);
+ const unsigned char *alpha = hasAlpha ? image.GetAlpha() + (h - 1)*w : NULL;
+ unsigned char *dstLineStart = (unsigned char *)m_data;
+ for ( int y = 0; y < h; y++ )
+ {
+ // copy one DIB line
+ unsigned char *dst = dstLineStart;
+ for ( int x = 0; x < w; x++ )
+ {
+ // also, the order of RGB is inversed for DIBs
+ *dst++ = src[2];
+ *dst++ = src[1];
+ *dst++ = src[0];
+
+ src += 3;
+
+ if ( alpha )
+ *dst++ = *alpha++;
+ }
+
+ // pass to the previous line in the image
+ src -= 2*srcBytesPerLine;
+ if ( alpha )
+ alpha -= 2*w;
+
+ // and to the next one in the DIB
+ dstLineStart += dstBytesPerLine;
+ }
+
+ return true;
+}
+
+#endif // wxUSE_IMAGE
+
+// ============================================================================
+// old DIB code, to be integrated in wxDIB class
+// ============================================================================
+
/*******************************************************************************
* *
* MODULE : DIB.CC *
projects / wxWidgets.git / commitdiff
