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/* wptJPG.cpp : JPG picture class |
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* Copyright (C) 2001 Dr.Yovav Gad <[email protected]> |
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* Copyright (C) 2005 Timo Schulz |
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* |
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* This file is part of WinPT. |
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* |
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* WinPT is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* WinPT is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with PTD; if not, write to the Free Software Foundation, |
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA |
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*/ |
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|
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/*----------------------------------------------------------------------------- |
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* Picture (Implementations) Version 1.00 |
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* |
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* Routinges for showing JPG pictur files |
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* |
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* Author: Dr. Yovav Gad, EMail: [email protected] ,Web: www.SuperMain.com |
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* |
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* This version uses a stripped down version of Picture.cpp and Picture.h. |
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*/ |
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#ifdef HAVE_CONFIG_H |
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#include <config.h> |
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#endif |
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|
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#include <windows.h> |
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#include <windows.h> |
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#include <ocidl.h> |
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#include <olectl.h> |
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|
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#include <stdio.h> |
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#include <string.h> |
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#include <errno.h> |
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#include <sys/stat.h> |
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|
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#include "wptJPG.h" |
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|
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#define HIMETRIC_INCH 2540 |
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#define ERROR_TITLE "CJPG Error" |
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|
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#define out_of_core() do { \ |
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MessageBox (NULL, "Can not allocate memory", ERROR_TITLE, MB_OK|MB_ICONSTOP); \ |
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return FALSE; \ |
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} while (0) |
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|
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|
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CJPG::CJPG (void) |
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{ |
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m_IPicture = NULL; |
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m_Height = 0; |
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m_Weight = 0; |
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m_Width = 0; |
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} |
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|
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|
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CJPG::~CJPG (void) |
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{ |
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if (m_IPicture != NULL) |
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freePictureData (); |
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} |
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|
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|
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|
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/* Free the allocated memory that holdes the IPicture Interface data |
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and clear picture information. */ |
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void |
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CJPG::freePictureData (void) |
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{ |
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if (m_IPicture != NULL) { |
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m_IPicture->Release(); |
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m_IPicture = NULL; |
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m_Height = 0; |
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m_Weight = 0; |
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m_Width = 0; |
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} |
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} |
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|
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|
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/* Open a JPG File And Load It Into IPicture (Interface) */ |
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BOOL |
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CJPG::load (LPCSTR sFilePathName) |
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{ |
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BOOL bResult = FALSE; |
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FILE * f; |
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int nSize = 0; |
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|
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if (m_IPicture != NULL) |
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freePictureData (); |
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|
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f = fopen (sFilePathName, "rb"); |
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if (f) { |
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struct stat st; |
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fstat (fileno (f), &st); |
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nSize = st.st_size; |
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BYTE *pBuffer = new BYTE[nSize]; |
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if (!pBuffer) { |
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fclose (f); |
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out_of_core (); |
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} |
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memset (pBuffer, 0, nSize); |
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if (fread(pBuffer, 1, nSize, f) > 0) { |
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if (loadPictureData (pBuffer, nSize)) |
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bResult = TRUE; |
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} |
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fclose (f); |
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delete [] pBuffer; |
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} |
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else { |
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MessageBox (NULL, strerror (errno), ERROR_TITLE, MB_OK|MB_ICONSTOP); |
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bResult = FALSE; |
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} |
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|
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m_Weight = nSize; /* Update Picture Size Info... */ |
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|
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if(m_IPicture != NULL) { |
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m_IPicture->get_Height (&m_Height); |
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m_IPicture->get_Width (&m_Width); |
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/* Calculate Its Size On a "Standard" (96 DPI) Device Context */ |
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m_Height = MulDiv (m_Height, 96, HIMETRIC_INCH); |
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m_Width = MulDiv (m_Width, 96, HIMETRIC_INCH); |
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} |
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else { |
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/* Picture data is not a known picture type */ |
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m_Height = 0; |
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m_Width = 0; |
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bResult = FALSE; |
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} |
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return bResult; |
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} |
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|
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|
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|
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/* read the picture data from a source (file / resource) |
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and load it into the current IPicture object in use */ |
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BOOL |
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CJPG::loadPictureData (BYTE *pBuffer, int nSize) |
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|
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{ |
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BOOL bResult = FALSE; |
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HGLOBAL hGlobal; |
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void* pData; |
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IStream* pStream = NULL; |
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|
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hGlobal = GlobalAlloc (GMEM_MOVEABLE, nSize); |
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if (hGlobal == NULL) { |
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out_of_core (); |
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return FALSE; |
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} |
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|
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pData = GlobalLock (hGlobal); |
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memcpy (pData, pBuffer, nSize); |
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GlobalUnlock (hGlobal); |
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|
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if (CreateStreamOnHGlobal (hGlobal, TRUE, &pStream) == S_OK) { |
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HRESULT hr; |
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hr = OleLoadPicture (pStream, nSize, FALSE, IID_IPicture, |
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(LPVOID *)&m_IPicture); |
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if (hr == E_NOINTERFACE) { |
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MessageBox (NULL, "IPicture interface is not supported", |
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ERROR_TITLE, MB_OK|MB_ICONSTOP); |
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return FALSE; |
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} |
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else { /* S_OK */ |
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pStream->Release (); |
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pStream = NULL; |
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bResult = TRUE; |
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} |
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} |
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|
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GlobalFree (hGlobal); |
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return (bResult); |
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} |
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|
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|
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/* Draw the loaded picture direct to the client DC */ |
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BOOL |
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CJPG::show (HDC pDC, POINT *LeftTop, POINT *WidthHeight, |
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int MagnifyX, int MagnifyY) |
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|
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{ |
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long Width = 0; |
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long Height = 0; |
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|
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if (pDC == NULL || m_IPicture == NULL) |
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return FALSE; |
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|
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m_IPicture->get_Width (&Width); |
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m_IPicture->get_Height (&Height); |
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|
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if (MagnifyX == 0) |
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MagnifyX = 0; |
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if (MagnifyY == 0) |
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MagnifyY = 0; |
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MagnifyX = int(MulDiv (Width, GetDeviceCaps(pDC, LOGPIXELSX), HIMETRIC_INCH) * MagnifyX); |
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MagnifyY = int(MulDiv (Height, GetDeviceCaps(pDC, LOGPIXELSY), HIMETRIC_INCH) * MagnifyY); |
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|
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RECT DrawRect; |
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DrawRect.left = LeftTop->x; |
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DrawRect.top = LeftTop->y; |
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DrawRect.right = MagnifyX; |
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DrawRect.bottom = MagnifyY; |
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|
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HRESULT hrP = 0; |
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|
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hrP = m_IPicture->Render (pDC, |
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LeftTop->x, // Left |
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LeftTop->y, // Top |
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WidthHeight->x +MagnifyX, // Width |
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WidthHeight->y +MagnifyY, // Height |
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0, |
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Height, |
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Width, |
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-Height, |
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&DrawRect); |
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|
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if (SUCCEEDED (hrP)) |
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return (TRUE); |
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|
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out_of_core (); |
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} |
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|
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|
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/* Get the original picture pixel size (ignore what current DC is using) |
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pointer to a Device Context is needed for pixel calculation, */ |
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BOOL |
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CJPG::updateSizeOnDC (HDC pDC) |
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|
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{ |
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if(pDC == NULL || m_IPicture == NULL) { |
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m_Height = 0; |
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m_Width = 0; |
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return (FALSE); |
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} |
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|
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m_IPicture->get_Height (&m_Height); |
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m_IPicture->get_Width (&m_Width); |
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|
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/* Get Current DPI - Dot Per Inch */ |
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int CurrentDPI_X = GetDeviceCaps (pDC, LOGPIXELSX); |
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int CurrentDPI_Y = GetDeviceCaps (pDC, LOGPIXELSY); |
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|
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m_Height = MulDiv (m_Height, CurrentDPI_Y, HIMETRIC_INCH); |
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m_Width = MulDiv (m_Width, CurrentDPI_X, HIMETRIC_INCH); |
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|
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return (TRUE); |
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} |
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