279 lines
8.5 KiB
C++
279 lines
8.5 KiB
C++
/////////////////////////////////////////////////////////////////////////////
|
|
// Name: wx/msw/dib.h
|
|
// Purpose: wxDIB class representing Win32 device independent bitmaps
|
|
// Author: Vadim Zeitlin
|
|
// Modified by:
|
|
// Created: 03.03.03 (replaces the old file with the same name)
|
|
// Copyright: (c) 1997-2003 wxWidgets team
|
|
// Licence: wxWindows licence
|
|
/////////////////////////////////////////////////////////////////////////////
|
|
|
|
#ifndef _WX_MSW_DIB_H_
|
|
#define _WX_MSW_DIB_H_
|
|
|
|
class WXDLLIMPEXP_FWD_CORE wxPalette;
|
|
|
|
#include "wx/msw/private.h"
|
|
|
|
#if wxUSE_WXDIB
|
|
|
|
#ifdef __WXMSW__
|
|
#include "wx/bitmap.h"
|
|
#endif // __WXMSW__
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// wxDIB: represents a DIB section
|
|
// ----------------------------------------------------------------------------
|
|
|
|
class WXDLLIMPEXP_CORE 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); }
|
|
|
|
#ifdef __WXMSW__
|
|
// create a DIB from the DDB
|
|
wxDIB(const wxBitmap& bmp)
|
|
{ Init(); (void)Create(bmp); }
|
|
#endif // __WXMSW__
|
|
|
|
// create a DIB from the Windows DDB
|
|
wxDIB(HBITMAP hbmp)
|
|
{ Init(); (void)Create(hbmp); }
|
|
|
|
// load a DIB from file (any depth is supoprted here unlike above)
|
|
//
|
|
// as above, use IsOk() to see if the bitmap was loaded successfully
|
|
wxDIB(const wxString& filename)
|
|
{ Init(); (void)Load(filename); }
|
|
|
|
// same as the corresponding ctors but with return value
|
|
bool Create(int width, int height, int depth);
|
|
#ifdef __WXMSW__
|
|
bool Create(const wxBitmap& bmp) { return Create(GetHbitmapOf(bmp)); }
|
|
#endif
|
|
bool Create(HBITMAP hbmp);
|
|
bool Load(const wxString& filename);
|
|
|
|
// dtor is not virtual, this class is not meant to be used polymorphically
|
|
~wxDIB();
|
|
|
|
|
|
// operations
|
|
// ----------
|
|
|
|
// create a bitmap compatible with the given HDC (or screen by default) and
|
|
// return its handle, the caller is responsible for freeing it (using
|
|
// DeleteObject())
|
|
HBITMAP CreateDDB(HDC hdc = 0) const;
|
|
|
|
// 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; }
|
|
|
|
#if defined(__WXMSW__) && wxUSE_PALETTE
|
|
// create a palette for this DIB (always a trivial/default one for 24bpp)
|
|
wxPalette *CreatePalette() const;
|
|
#endif // defined(__WXMSW__) && wxUSE_PALETTE
|
|
|
|
// save the DIB as a .BMP file to the file with the given name
|
|
bool Save(const wxString& filename);
|
|
|
|
|
|
// 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
|
|
unsigned char *GetData() const
|
|
{ DoGetObject(); return (unsigned char *)m_data; }
|
|
|
|
|
|
// HBITMAP conversion
|
|
// ------------------
|
|
|
|
// these functions are only used by wxWidgets internally right now, please
|
|
// don't use them directly if possible as they're subject to change
|
|
|
|
// creates a DDB compatible with the given (or screen) DC from either
|
|
// a plain DIB or a DIB section (in which case the last parameter must be
|
|
// non NULL)
|
|
static HBITMAP ConvertToBitmap(const BITMAPINFO *pbi,
|
|
HDC hdc = 0,
|
|
void *bits = NULL);
|
|
|
|
// create a plain DIB (not a DIB section) from a DDB, the caller is
|
|
// responsable for freeing it using ::GlobalFree()
|
|
static HGLOBAL ConvertFromBitmap(HBITMAP hbmp);
|
|
|
|
// creates a DIB from the given DDB or calculates the space needed by it:
|
|
// if pbi is NULL, only the space is calculated, otherwise pbi is supposed
|
|
// to point at BITMAPINFO of the correct size which is filled by this
|
|
// function (this overload is needed for wxBitmapDataObject code in
|
|
// src/msw/ole/dataobj.cpp)
|
|
static size_t ConvertFromBitmap(BITMAPINFO *pbi, HBITMAP hbmp);
|
|
|
|
|
|
// wxImage conversion
|
|
// ------------------
|
|
|
|
#if wxUSE_IMAGE
|
|
// Possible formats for DIBs created by the functions below.
|
|
enum PixelFormat
|
|
{
|
|
PixelFormat_PreMultiplied = 0,
|
|
PixelFormat_NotPreMultiplied = 1
|
|
};
|
|
|
|
// Create a DIB from the given image, the DIB will be either 24 or 32 (if
|
|
// the image has alpha channel) bpp.
|
|
//
|
|
// By default the DIB stores pixel data in pre-multiplied format so that it
|
|
// can be used with ::AlphaBlend() but it is also possible to disable
|
|
// pre-multiplication for the DIB to be usable with ImageList_Draw() which
|
|
// does pre-multiplication internally.
|
|
wxDIB(const wxImage& image, PixelFormat pf = PixelFormat_PreMultiplied)
|
|
{
|
|
Init();
|
|
(void)Create(image, pf);
|
|
}
|
|
|
|
// same as the above ctor but with the return code
|
|
bool Create(const wxImage& image, PixelFormat pf = PixelFormat_PreMultiplied);
|
|
|
|
// create wxImage having the same data as this DIB
|
|
|
|
// Possible options of conversion to wxImage
|
|
enum ConversionFlags
|
|
{
|
|
// Determine whether 32bpp DIB contains real alpha channel
|
|
// and return wxImage with or without alpha channel values.
|
|
Convert_AlphaAuto,
|
|
// Assume that 32bpp DIB contains valid alpha channel and always
|
|
// return wxImage with alpha channel values in this case.
|
|
Convert_AlphaAlwaysIf32bpp
|
|
};
|
|
wxImage ConvertToImage(ConversionFlags flags = Convert_AlphaAuto) 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();
|
|
|
|
// free resources
|
|
void Free();
|
|
|
|
// initialize the contents from the provided DDB (Create() must have been
|
|
// already called)
|
|
bool CopyFromDDB(HBITMAP hbmp);
|
|
|
|
|
|
// 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;
|
|
|
|
// in some cases we could be using a handle which we didn't create and in
|
|
// this case we shouldn't free it neither -- this flag tell us if this is
|
|
// the case
|
|
bool m_ownsHandle;
|
|
|
|
|
|
// DIBs can't be copied
|
|
wxDIB(const wxDIB&);
|
|
wxDIB& operator=(const wxDIB&);
|
|
};
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// inline functions implementation
|
|
// ----------------------------------------------------------------------------
|
|
|
|
inline
|
|
void wxDIB::Init()
|
|
{
|
|
m_handle = 0;
|
|
m_ownsHandle = true;
|
|
|
|
m_data = NULL;
|
|
|
|
m_width =
|
|
m_height =
|
|
m_depth = 0;
|
|
}
|
|
|
|
inline
|
|
void wxDIB::Free()
|
|
{
|
|
if ( m_handle && m_ownsHandle )
|
|
{
|
|
if ( !::DeleteObject(m_handle) )
|
|
{
|
|
wxLogLastError(wxT("DeleteObject(hDIB)"));
|
|
}
|
|
|
|
Init();
|
|
}
|
|
}
|
|
|
|
inline wxDIB::~wxDIB()
|
|
{
|
|
Free();
|
|
}
|
|
|
|
#endif
|
|
// wxUSE_WXDIB
|
|
|
|
#endif // _WX_MSW_DIB_H_
|
|
|