X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/fef15b42f36ea19d7162f4ff2750423cc954e7e3..8e77fd8bca165aab9709649d79a7cbc6a172d4e1:/include/wx/msw/dib.h?ds=sidebyside diff --git a/include/wx/msw/dib.h b/include/wx/msw/dib.h index dce72a1404..fcfce370fd 100644 --- a/include/wx/msw/dib.h +++ b/include/wx/msw/dib.h @@ -1,53 +1,272 @@ ///////////////////////////////////////////////////////////////////////////// // 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 wxWidgets 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; +class WXDLLIMPEXP_FWD_CORE wxPalette; + +#include "wx/msw/private.h" + +#if wxUSE_WXDIB + +#ifdef __WXMSW__ + #include "wx/bitmap.h" +#endif // __WXMSW__ // ---------------------------------------------------------------------------- -// Functions for working with DIBs +// wxDIB: represents a DIB section // ---------------------------------------------------------------------------- -// 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) +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 + // ---------- + +#ifndef __WXWINCE__ + // 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; +#endif // !__WXWINCE__ + + // 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 wxUSE_PALETTE + // create a palette for this DIB (always a trivial/default one for 24bpp) + wxPalette *CreatePalette() const; +#endif // 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 + +#ifndef __WXWINCE__ + // 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); +#endif // __WXWINCE__ + + + // 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 + 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(); + + // 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 +// ---------------------------------------------------------------------------- -// defined in bitmap.cpp -extern bool wxCreateDIB(long xSize, long ySize, long bitsPerPixel, - HPALETTE hPal, LPBITMAPINFO* lpDIBHeader); -extern void wxFreeDIB(LPBITMAPINFO lpDIBHeader); +inline +void wxDIB::Init() +{ + m_handle = 0; + m_ownsHandle = true; -// defined in ole/dataobj.cpp -extern size_t wxConvertBitmapToDIB(LPBITMAPINFO pbi, const wxBitmap& bitmap); -extern wxBitmap wxConvertDIBToBitmap(const LPBITMAPINFO pbi); + m_data = NULL; -// the rest is defined in dib.cpp + m_width = + m_height = + m_depth = 0; +} -// Save (device dependent) wxBitmap as a DIB -bool wxSaveBitmap(wxChar *filename, wxBitmap *bitmap, wxPalette *colourmap = NULL); +inline +void wxDIB::Free() +{ + if ( m_handle && m_ownsHandle ) + { + if ( !::DeleteObject(m_handle) ) + { + wxLogLastError(wxT("DeleteObject(hDIB)")); + } -// Load device independent bitmap into device dependent bitmap -wxBitmap *wxLoadBitmap(wxChar *filename, wxPalette **colourmap = NULL); + Init(); + } +} -// Load into existing bitmap; -bool wxLoadIntoBitmap(wxChar *filename, wxBitmap *bitmap, wxPalette **pal = NULL); +inline wxDIB::~wxDIB() +{ + Free(); +} -HANDLE wxBitmapToDIB (HBITMAP hBitmap, HPALETTE hPal); -BOOL wxReadDIB(LPTSTR lpFileName, HBITMAP *bitmap, HPALETTE *palette); -HANDLE wxReadDIB2(LPTSTR lpFileName); -LPSTR wxFindDIBBits (LPSTR lpbi); -HPALETTE wxMakeDIBPalette(LPBITMAPINFOHEADER lpInfo); +#endif + // wxUSE_WXDIB -#endif // _WX_DIB_H_ +#endif // _WX_MSW_DIB_H_