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964 lines
26 KiB
C
964 lines
26 KiB
C
//------------------------------------
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// VisualPng.C -- Shows a PNG image
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//------------------------------------
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// Copyright 2000, Willem van Schaik.
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// This code is released under the libpng license.
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// For conditions of distribution and use, see the disclaimer
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// and license in png.h
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// switches
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// defines
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#define PROGNAME "VisualPng"
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#define LONGNAME "Win32 Viewer for PNG-files"
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#define VERSION "1.0 of 2000 June 07"
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// constants
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#define MARGIN 8
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// standard includes
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <windows.h>
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// application includes
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#include "png.h"
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#include "pngfile.h"
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#include "resource.h"
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// macros
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// function prototypes
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LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM);
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BOOL CALLBACK AboutDlgProc (HWND, UINT, WPARAM, LPARAM) ;
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BOOL CenterAbout (HWND hwndChild, HWND hwndParent);
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BOOL BuildPngList (PTSTR pstrPathName, TCHAR **ppFileList, int *pFileCount,
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int *pFileIndex);
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BOOL SearchPngList (TCHAR *pFileList, int FileCount, int *pFileIndex,
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PTSTR pstrPrevName, PTSTR pstrNextName);
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BOOL LoadImageFile(HWND hwnd, PTSTR pstrPathName,
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png_byte **ppbImage, int *pxImgSize, int *pyImgSize, int *piChannels,
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png_color *pBkgColor);
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BOOL DisplayImage (HWND hwnd, BYTE **ppDib,
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BYTE **ppDiData, int cxWinSize, int cyWinSize,
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BYTE *pbImage, int cxImgSize, int cyImgSize, int cImgChannels,
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BOOL bStretched);
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BOOL InitBitmap (
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BYTE *pDiData, int cxWinSize, int cyWinSize);
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BOOL FillBitmap (
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BYTE *pDiData, int cxWinSize, int cyWinSize,
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BYTE *pbImage, int cxImgSize, int cyImgSize, int cImgChannels,
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BOOL bStretched);
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// a few global variables
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static char *szProgName = PROGNAME;
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static char *szAppName = LONGNAME;
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static char *szIconName = PROGNAME;
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static char szCmdFileName [MAX_PATH];
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// MAIN routine
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int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
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PSTR szCmdLine, int iCmdShow)
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{
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HACCEL hAccel;
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HWND hwnd;
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MSG msg;
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WNDCLASS wndclass;
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int ixBorders, iyBorders;
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wndclass.style = CS_HREDRAW | CS_VREDRAW;
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wndclass.lpfnWndProc = WndProc;
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wndclass.cbClsExtra = 0;
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wndclass.cbWndExtra = 0;
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wndclass.hInstance = hInstance;
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wndclass.hIcon = LoadIcon (hInstance, szIconName) ;
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wndclass.hCursor = LoadCursor (NULL, IDC_ARROW);
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wndclass.hbrBackground = NULL; // (HBRUSH) GetStockObject (GRAY_BRUSH);
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wndclass.lpszMenuName = szProgName;
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wndclass.lpszClassName = szProgName;
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if (!RegisterClass (&wndclass))
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{
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MessageBox (NULL, TEXT ("Error: this program requires Windows NT!"),
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szProgName, MB_ICONERROR);
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return 0;
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}
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// if filename given on commandline, store it
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if ((szCmdLine != NULL) && (*szCmdLine != '\0'))
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if (szCmdLine[0] == '"')
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strncpy (szCmdFileName, szCmdLine + 1, strlen(szCmdLine) - 2);
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else
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strcpy (szCmdFileName, szCmdLine);
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else
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strcpy (szCmdFileName, "");
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// calculate size of window-borders
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ixBorders = 2 * (GetSystemMetrics (SM_CXBORDER) +
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GetSystemMetrics (SM_CXDLGFRAME));
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iyBorders = 2 * (GetSystemMetrics (SM_CYBORDER) +
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GetSystemMetrics (SM_CYDLGFRAME)) +
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GetSystemMetrics (SM_CYCAPTION) +
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GetSystemMetrics (SM_CYMENUSIZE) +
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1; /* WvS: don't ask me why? */
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hwnd = CreateWindow (szProgName, szAppName,
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WS_OVERLAPPEDWINDOW,
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CW_USEDEFAULT, CW_USEDEFAULT,
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512 + 2 * MARGIN + ixBorders, 384 + 2 * MARGIN + iyBorders,
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// CW_USEDEFAULT, CW_USEDEFAULT,
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NULL, NULL, hInstance, NULL);
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ShowWindow (hwnd, iCmdShow);
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UpdateWindow (hwnd);
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hAccel = LoadAccelerators (hInstance, szProgName);
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while (GetMessage (&msg, NULL, 0, 0))
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{
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if (!TranslateAccelerator (hwnd, hAccel, &msg))
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{
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TranslateMessage (&msg);
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DispatchMessage (&msg);
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}
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}
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return msg.wParam;
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}
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LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam,
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LPARAM lParam)
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{
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static HINSTANCE hInstance ;
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static HDC hdc;
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static PAINTSTRUCT ps;
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static HMENU hMenu;
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static BITMAPFILEHEADER *pbmfh;
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static BITMAPINFOHEADER *pbmih;
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static BYTE *pbImage;
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static int cxWinSize, cyWinSize;
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static int cxImgSize, cyImgSize;
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static int cImgChannels;
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static png_color bkgColor = {127, 127, 127};
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static BOOL bStretched = TRUE;
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static BYTE *pDib = NULL;
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static BYTE *pDiData = NULL;
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static TCHAR szImgPathName [MAX_PATH];
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static TCHAR szTitleName [MAX_PATH];
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static TCHAR *pPngFileList = NULL;
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static int iPngFileCount;
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static int iPngFileIndex;
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BOOL bOk;
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switch (message)
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{
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case WM_CREATE:
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hInstance = ((LPCREATESTRUCT) lParam)->hInstance ;
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PngFileInitialize (hwnd);
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strcpy (szImgPathName, "");
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// in case we process file given on command-line
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if (szCmdFileName[0] != '\0')
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{
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strcpy (szImgPathName, szCmdFileName);
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// read the other png-files in the directory for later
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// next/previous commands
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BuildPngList (szImgPathName, &pPngFileList, &iPngFileCount,
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&iPngFileIndex);
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// load the image from file
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if (!LoadImageFile (hwnd, szImgPathName,
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&pbImage, &cxImgSize, &cyImgSize, &cImgChannels, &bkgColor))
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return 0;
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// invalidate the client area for later update
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InvalidateRect (hwnd, NULL, TRUE);
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// display the PNG into the DIBitmap
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DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
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pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
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}
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return 0;
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case WM_SIZE:
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cxWinSize = LOWORD (lParam);
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cyWinSize = HIWORD (lParam);
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// invalidate the client area for later update
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InvalidateRect (hwnd, NULL, TRUE);
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// display the PNG into the DIBitmap
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DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
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pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
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return 0;
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case WM_INITMENUPOPUP:
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hMenu = GetMenu (hwnd);
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if (pbImage)
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EnableMenuItem (hMenu, IDM_FILE_SAVE, MF_ENABLED);
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else
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EnableMenuItem (hMenu, IDM_FILE_SAVE, MF_GRAYED);
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return 0;
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case WM_COMMAND:
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hMenu = GetMenu (hwnd);
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switch (LOWORD (wParam))
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{
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case IDM_FILE_OPEN:
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// show the File Open dialog box
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if (!PngFileOpenDlg (hwnd, szImgPathName, szTitleName))
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return 0;
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// read the other png-files in the directory for later
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// next/previous commands
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BuildPngList (szImgPathName, &pPngFileList, &iPngFileCount,
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&iPngFileIndex);
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// load the image from file
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if (!LoadImageFile (hwnd, szImgPathName,
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&pbImage, &cxImgSize, &cyImgSize, &cImgChannels, &bkgColor))
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return 0;
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// invalidate the client area for later update
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InvalidateRect (hwnd, NULL, TRUE);
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// display the PNG into the DIBitmap
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DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
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pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
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return 0;
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case IDM_FILE_SAVE:
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// show the File Save dialog box
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if (!PngFileSaveDlg (hwnd, szImgPathName, szTitleName))
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return 0;
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// save the PNG to a disk file
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SetCursor (LoadCursor (NULL, IDC_WAIT));
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ShowCursor (TRUE);
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bOk = PngSaveImage (szImgPathName, pDiData, cxWinSize, cyWinSize,
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bkgColor);
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ShowCursor (FALSE);
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SetCursor (LoadCursor (NULL, IDC_ARROW));
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if (!bOk)
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MessageBox (hwnd, TEXT ("Error in saving the PNG image"),
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szProgName, MB_ICONEXCLAMATION | MB_OK);
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return 0;
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case IDM_FILE_NEXT:
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// read next entry in the directory
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if (SearchPngList (pPngFileList, iPngFileCount, &iPngFileIndex,
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NULL, szImgPathName))
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{
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if (strcmp (szImgPathName, "") == 0)
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return 0;
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// load the image from file
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if (!LoadImageFile (hwnd, szImgPathName, &pbImage,
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&cxImgSize, &cyImgSize, &cImgChannels, &bkgColor))
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return 0;
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// invalidate the client area for later update
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InvalidateRect (hwnd, NULL, TRUE);
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// display the PNG into the DIBitmap
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DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
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pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
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}
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return 0;
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case IDM_FILE_PREVIOUS:
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// read previous entry in the directory
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if (SearchPngList (pPngFileList, iPngFileCount, &iPngFileIndex,
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szImgPathName, NULL))
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{
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if (strcmp (szImgPathName, "") == 0)
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return 0;
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// load the image from file
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if (!LoadImageFile (hwnd, szImgPathName, &pbImage, &cxImgSize,
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&cyImgSize, &cImgChannels, &bkgColor))
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return 0;
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// invalidate the client area for later update
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InvalidateRect (hwnd, NULL, TRUE);
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// display the PNG into the DIBitmap
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DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
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pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
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}
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return 0;
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case IDM_FILE_EXIT:
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// more cleanup needed...
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// free image buffer
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if (pDib != NULL)
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{
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free (pDib);
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pDib = NULL;
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}
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// free file-list
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if (pPngFileList != NULL)
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{
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free (pPngFileList);
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pPngFileList = NULL;
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}
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// let's go ...
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exit (0);
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return 0;
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case IDM_OPTIONS_STRETCH:
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bStretched = !bStretched;
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if (bStretched)
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CheckMenuItem (hMenu, IDM_OPTIONS_STRETCH, MF_CHECKED);
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else
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CheckMenuItem (hMenu, IDM_OPTIONS_STRETCH, MF_UNCHECKED);
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// invalidate the client area for later update
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InvalidateRect (hwnd, NULL, TRUE);
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// display the PNG into the DIBitmap
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DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
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pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
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return 0;
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case IDM_HELP_ABOUT:
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DialogBox (hInstance, TEXT ("AboutBox"), hwnd, AboutDlgProc) ;
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return 0;
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} // end switch
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break;
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case WM_PAINT:
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hdc = BeginPaint (hwnd, &ps);
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if (pDib)
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SetDIBitsToDevice (hdc, 0, 0, cxWinSize, cyWinSize, 0, 0,
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0, cyWinSize, pDiData, (BITMAPINFO *) pDib, DIB_RGB_COLORS);
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EndPaint (hwnd, &ps);
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return 0;
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case WM_DESTROY:
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if (pbmfh)
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{
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free (pbmfh);
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pbmfh = NULL;
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}
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PostQuitMessage (0);
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return 0;
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}
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return DefWindowProc (hwnd, message, wParam, lParam);
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}
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BOOL CALLBACK AboutDlgProc (HWND hDlg, UINT message,
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WPARAM wParam, LPARAM lParam)
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{
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switch (message)
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{
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case WM_INITDIALOG :
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ShowWindow (hDlg, SW_HIDE);
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CenterAbout (hDlg, GetWindow (hDlg, GW_OWNER));
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ShowWindow (hDlg, SW_SHOW);
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return TRUE ;
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case WM_COMMAND :
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switch (LOWORD (wParam))
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{
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case IDOK :
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case IDCANCEL :
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EndDialog (hDlg, 0) ;
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return TRUE ;
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}
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break ;
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}
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return FALSE ;
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}
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//---------------
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// CenterAbout
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//---------------
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BOOL CenterAbout (HWND hwndChild, HWND hwndParent)
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{
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RECT rChild, rParent, rWorkArea;
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int wChild, hChild, wParent, hParent;
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int xNew, yNew;
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BOOL bResult;
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// Get the Height and Width of the child window
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GetWindowRect (hwndChild, &rChild);
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wChild = rChild.right - rChild.left;
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hChild = rChild.bottom - rChild.top;
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// Get the Height and Width of the parent window
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GetWindowRect (hwndParent, &rParent);
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wParent = rParent.right - rParent.left;
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hParent = rParent.bottom - rParent.top;
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// Get the limits of the 'workarea'
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bResult = SystemParametersInfo(
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SPI_GETWORKAREA, // system parameter to query or set
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sizeof(RECT),
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&rWorkArea,
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0);
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if (!bResult) {
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rWorkArea.left = rWorkArea.top = 0;
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rWorkArea.right = GetSystemMetrics(SM_CXSCREEN);
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rWorkArea.bottom = GetSystemMetrics(SM_CYSCREEN);
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}
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// Calculate new X position, then adjust for workarea
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xNew = rParent.left + ((wParent - wChild) /2);
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if (xNew < rWorkArea.left) {
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xNew = rWorkArea.left;
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} else if ((xNew+wChild) > rWorkArea.right) {
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xNew = rWorkArea.right - wChild;
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}
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// Calculate new Y position, then adjust for workarea
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yNew = rParent.top + ((hParent - hChild) /2);
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if (yNew < rWorkArea.top) {
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yNew = rWorkArea.top;
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} else if ((yNew+hChild) > rWorkArea.bottom) {
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yNew = rWorkArea.bottom - hChild;
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}
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// Set it, and return
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return SetWindowPos (hwndChild, NULL, xNew, yNew, 0, 0, SWP_NOSIZE |
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SWP_NOZORDER);
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}
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//----------------
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// BuildPngList
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//----------------
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BOOL BuildPngList (PTSTR pstrPathName, TCHAR **ppFileList, int *pFileCount,
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int *pFileIndex)
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{
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static TCHAR szImgPathName [MAX_PATH];
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static TCHAR szImgFileName [MAX_PATH];
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static TCHAR szImgFindName [MAX_PATH];
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WIN32_FIND_DATA finddata;
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HANDLE hFind;
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static TCHAR szTmp [MAX_PATH];
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BOOL bOk;
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int i, ii;
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int j, jj;
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// free previous file-list
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if (*ppFileList != NULL)
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{
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free (*ppFileList);
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*ppFileList = NULL;
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}
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// extract foldername, filename and search-name
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strcpy (szImgPathName, pstrPathName);
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strcpy (szImgFileName, strrchr (pstrPathName, '\\') + 1);
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strcpy (szImgFindName, szImgPathName);
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*(strrchr (szImgFindName, '\\') + 1) = '\0';
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strcat (szImgFindName, "*.png");
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// first cycle: count number of files in directory for memory allocation
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*pFileCount = 0;
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hFind = FindFirstFile(szImgFindName, &finddata);
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bOk = (hFind != (HANDLE) -1);
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while (bOk)
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{
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*pFileCount += 1;
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bOk = FindNextFile(hFind, &finddata);
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}
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FindClose(hFind);
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// allocation memory for file-list
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*ppFileList = (TCHAR *) malloc (*pFileCount * MAX_PATH);
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|
|
// second cycle: read directory and store filenames in file-list
|
|
|
|
hFind = FindFirstFile(szImgFindName, &finddata);
|
|
bOk = (hFind != (HANDLE) -1);
|
|
|
|
i = 0;
|
|
ii = 0;
|
|
while (bOk)
|
|
{
|
|
strcpy (*ppFileList + ii, szImgPathName);
|
|
strcpy (strrchr(*ppFileList + ii, '\\') + 1, finddata.cFileName);
|
|
|
|
if (strcmp(pstrPathName, *ppFileList + ii) == 0)
|
|
*pFileIndex = i;
|
|
|
|
ii += MAX_PATH;
|
|
i++;
|
|
|
|
bOk = FindNextFile(hFind, &finddata);
|
|
}
|
|
FindClose(hFind);
|
|
|
|
// finally we must sort the file-list
|
|
|
|
for (i = 0; i < *pFileCount - 1; i++)
|
|
{
|
|
ii = i * MAX_PATH;
|
|
for (j = i+1; j < *pFileCount; j++)
|
|
{
|
|
jj = j * MAX_PATH;
|
|
if (strcmp (*ppFileList + ii, *ppFileList + jj) > 0)
|
|
{
|
|
strcpy (szTmp, *ppFileList + jj);
|
|
strcpy (*ppFileList + jj, *ppFileList + ii);
|
|
strcpy (*ppFileList + ii, szTmp);
|
|
|
|
// check if this was the current image that we moved
|
|
|
|
if (*pFileIndex == i)
|
|
*pFileIndex = j;
|
|
else
|
|
if (*pFileIndex == j)
|
|
*pFileIndex = i;
|
|
}
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
//----------------
|
|
// SearchPngList
|
|
//----------------
|
|
|
|
BOOL SearchPngList (
|
|
TCHAR *pFileList, int FileCount, int *pFileIndex,
|
|
PTSTR pstrPrevName, PTSTR pstrNextName)
|
|
{
|
|
if (FileCount > 0)
|
|
{
|
|
// get previous entry
|
|
|
|
if (pstrPrevName != NULL)
|
|
{
|
|
if (*pFileIndex > 0)
|
|
*pFileIndex -= 1;
|
|
else
|
|
*pFileIndex = FileCount - 1;
|
|
|
|
strcpy (pstrPrevName, pFileList + (*pFileIndex * MAX_PATH));
|
|
}
|
|
|
|
// get next entry
|
|
|
|
if (pstrNextName != NULL)
|
|
{
|
|
if (*pFileIndex < FileCount - 1)
|
|
*pFileIndex += 1;
|
|
else
|
|
*pFileIndex = 0;
|
|
|
|
strcpy (pstrNextName, pFileList + (*pFileIndex * MAX_PATH));
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
else
|
|
{
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
//-----------------
|
|
// LoadImageFile
|
|
//-----------------
|
|
|
|
BOOL LoadImageFile (HWND hwnd, PTSTR pstrPathName,
|
|
png_byte **ppbImage, int *pxImgSize, int *pyImgSize,
|
|
int *piChannels, png_color *pBkgColor)
|
|
{
|
|
static TCHAR szTmp [MAX_PATH];
|
|
|
|
// if there's an existing PNG, free the memory
|
|
|
|
if (*ppbImage)
|
|
{
|
|
free (*ppbImage);
|
|
*ppbImage = NULL;
|
|
}
|
|
|
|
// Load the entire PNG into memory
|
|
|
|
SetCursor (LoadCursor (NULL, IDC_WAIT));
|
|
ShowCursor (TRUE);
|
|
|
|
PngLoadImage (pstrPathName, ppbImage, pxImgSize, pyImgSize, piChannels,
|
|
pBkgColor);
|
|
|
|
ShowCursor (FALSE);
|
|
SetCursor (LoadCursor (NULL, IDC_ARROW));
|
|
|
|
if (*ppbImage != NULL)
|
|
{
|
|
sprintf (szTmp, "VisualPng - %s", strrchr(pstrPathName, '\\') + 1);
|
|
SetWindowText (hwnd, szTmp);
|
|
}
|
|
else
|
|
{
|
|
MessageBox (hwnd, TEXT ("Error in loading the PNG image"),
|
|
szProgName, MB_ICONEXCLAMATION | MB_OK);
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
//----------------
|
|
// DisplayImage
|
|
//----------------
|
|
|
|
BOOL DisplayImage (HWND hwnd, BYTE **ppDib,
|
|
BYTE **ppDiData, int cxWinSize, int cyWinSize,
|
|
BYTE *pbImage, int cxImgSize, int cyImgSize, int cImgChannels,
|
|
BOOL bStretched)
|
|
{
|
|
BYTE *pDib = *ppDib;
|
|
BYTE *pDiData = *ppDiData;
|
|
// BITMAPFILEHEADER *pbmfh;
|
|
BITMAPINFOHEADER *pbmih;
|
|
WORD wDIRowBytes;
|
|
png_color bkgBlack = {0, 0, 0};
|
|
png_color bkgGray = {127, 127, 127};
|
|
png_color bkgWhite = {255, 255, 255};
|
|
|
|
// allocate memory for the Device Independant bitmap
|
|
|
|
wDIRowBytes = (WORD) ((3 * cxWinSize + 3L) >> 2) << 2;
|
|
|
|
if (pDib)
|
|
{
|
|
free (pDib);
|
|
pDib = NULL;
|
|
}
|
|
|
|
if (!(pDib = (BYTE *) malloc (sizeof(BITMAPINFOHEADER) +
|
|
wDIRowBytes * cyWinSize)))
|
|
{
|
|
MessageBox (hwnd, TEXT ("Error in displaying the PNG image"),
|
|
szProgName, MB_ICONEXCLAMATION | MB_OK);
|
|
*ppDib = pDib = NULL;
|
|
return FALSE;
|
|
}
|
|
*ppDib = pDib;
|
|
memset (pDib, 0, sizeof(BITMAPINFOHEADER));
|
|
|
|
// initialize the dib-structure
|
|
|
|
pbmih = (BITMAPINFOHEADER *) pDib;
|
|
pbmih->biSize = sizeof(BITMAPINFOHEADER);
|
|
pbmih->biWidth = cxWinSize;
|
|
pbmih->biHeight = -((long) cyWinSize);
|
|
pbmih->biPlanes = 1;
|
|
pbmih->biBitCount = 24;
|
|
pbmih->biCompression = 0;
|
|
pDiData = pDib + sizeof(BITMAPINFOHEADER);
|
|
*ppDiData = pDiData;
|
|
|
|
// first fill bitmap with gray and image border
|
|
|
|
InitBitmap (pDiData, cxWinSize, cyWinSize);
|
|
|
|
// then fill bitmap with image
|
|
|
|
if (pbImage)
|
|
{
|
|
FillBitmap (
|
|
pDiData, cxWinSize, cyWinSize,
|
|
pbImage, cxImgSize, cyImgSize, cImgChannels,
|
|
bStretched);
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
//--------------
|
|
// InitBitmap
|
|
//--------------
|
|
|
|
BOOL InitBitmap (BYTE *pDiData, int cxWinSize, int cyWinSize)
|
|
{
|
|
BYTE *dst;
|
|
int x, y, col;
|
|
|
|
// initialize the background with gray
|
|
|
|
dst = pDiData;
|
|
for (y = 0; y < cyWinSize; y++)
|
|
{
|
|
col = 0;
|
|
for (x = 0; x < cxWinSize; x++)
|
|
{
|
|
// fill with GRAY
|
|
*dst++ = 127;
|
|
*dst++ = 127;
|
|
*dst++ = 127;
|
|
col += 3;
|
|
}
|
|
// rows start on 4 byte boundaries
|
|
while ((col % 4) != 0)
|
|
{
|
|
dst++;
|
|
col++;
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
//--------------
|
|
// FillBitmap
|
|
//--------------
|
|
|
|
BOOL FillBitmap (
|
|
BYTE *pDiData, int cxWinSize, int cyWinSize,
|
|
BYTE *pbImage, int cxImgSize, int cyImgSize, int cImgChannels,
|
|
BOOL bStretched)
|
|
{
|
|
BYTE *pStretchedImage;
|
|
BYTE *pImg;
|
|
BYTE *src, *dst;
|
|
BYTE r, g, b, a;
|
|
const int cDIChannels = 3;
|
|
WORD wImgRowBytes;
|
|
WORD wDIRowBytes;
|
|
int cxNewSize, cyNewSize;
|
|
int cxImgPos, cyImgPos;
|
|
int xImg, yImg;
|
|
int xWin, yWin;
|
|
int xOld, yOld;
|
|
int xNew, yNew;
|
|
|
|
if (bStretched)
|
|
{
|
|
cxNewSize = cxWinSize - 2 * MARGIN;
|
|
cyNewSize = cyWinSize - 2 * MARGIN;
|
|
|
|
// stretch the image to it's window determined size
|
|
|
|
// the following two are the same, but the first has side-effects
|
|
// because of rounding
|
|
// if ((cyNewSize / cxNewSize) > (cyImgSize / cxImgSize))
|
|
if ((cyNewSize * cxImgSize) > (cyImgSize * cxNewSize))
|
|
{
|
|
cyNewSize = cxNewSize * cyImgSize / cxImgSize;
|
|
cxImgPos = MARGIN;
|
|
cyImgPos = (cyWinSize - cyNewSize) / 2;
|
|
}
|
|
else
|
|
{
|
|
cxNewSize = cyNewSize * cxImgSize / cyImgSize;
|
|
cyImgPos = MARGIN;
|
|
cxImgPos = (cxWinSize - cxNewSize) / 2;
|
|
}
|
|
|
|
pStretchedImage = malloc (cImgChannels * cxNewSize * cyNewSize);
|
|
pImg = pStretchedImage;
|
|
|
|
for (yNew = 0; yNew < cyNewSize; yNew++)
|
|
{
|
|
yOld = yNew * cyImgSize / cyNewSize;
|
|
for (xNew = 0; xNew < cxNewSize; xNew++)
|
|
{
|
|
xOld = xNew * cxImgSize / cxNewSize;
|
|
|
|
r = *(pbImage + cImgChannels * ((yOld * cxImgSize) + xOld) + 0);
|
|
g = *(pbImage + cImgChannels * ((yOld * cxImgSize) + xOld) + 1);
|
|
b = *(pbImage + cImgChannels * ((yOld * cxImgSize) + xOld) + 2);
|
|
*pImg++ = r;
|
|
*pImg++ = g;
|
|
*pImg++ = b;
|
|
if (cImgChannels == 4)
|
|
{
|
|
a = *(pbImage + cImgChannels * ((yOld * cxImgSize) + xOld)
|
|
+ 3);
|
|
*pImg++ = a;
|
|
}
|
|
}
|
|
}
|
|
|
|
// calculate row-bytes
|
|
|
|
wImgRowBytes = cImgChannels * cxNewSize;
|
|
wDIRowBytes = (WORD) ((cDIChannels * cxWinSize + 3L) >> 2) << 2;
|
|
|
|
// copy image to screen
|
|
|
|
for (yImg = 0, yWin = cyImgPos; yImg < cyNewSize; yImg++, yWin++)
|
|
{
|
|
if (yWin >= cyWinSize - cyImgPos)
|
|
break;
|
|
src = pStretchedImage + yImg * wImgRowBytes;
|
|
dst = pDiData + yWin * wDIRowBytes + cxImgPos * cDIChannels;
|
|
|
|
for (xImg = 0, xWin = cxImgPos; xImg < cxNewSize; xImg++, xWin++)
|
|
{
|
|
if (xWin >= cxWinSize - cxImgPos)
|
|
break;
|
|
r = *src++;
|
|
g = *src++;
|
|
b = *src++;
|
|
*dst++ = b; /* note the reverse order */
|
|
*dst++ = g;
|
|
*dst++ = r;
|
|
if (cImgChannels == 4)
|
|
{
|
|
a = *src++;
|
|
}
|
|
}
|
|
}
|
|
|
|
// free memory
|
|
|
|
if (pStretchedImage != NULL)
|
|
{
|
|
free (pStretchedImage);
|
|
pStretchedImage = NULL;
|
|
}
|
|
|
|
}
|
|
|
|
// process the image not-stretched
|
|
|
|
else
|
|
{
|
|
// calculate the central position
|
|
|
|
cxImgPos = (cxWinSize - cxImgSize) / 2;
|
|
cyImgPos = (cyWinSize - cyImgSize) / 2;
|
|
|
|
// check for image larger than window
|
|
|
|
if (cxImgPos < MARGIN)
|
|
cxImgPos = MARGIN;
|
|
if (cyImgPos < MARGIN)
|
|
cyImgPos = MARGIN;
|
|
|
|
// calculate both row-bytes
|
|
|
|
wImgRowBytes = cImgChannels * cxImgSize;
|
|
wDIRowBytes = (WORD) ((cDIChannels * cxWinSize + 3L) >> 2) << 2;
|
|
|
|
// copy image to screen
|
|
|
|
for (yImg = 0, yWin = cyImgPos; yImg < cyImgSize; yImg++, yWin++)
|
|
{
|
|
if (yWin >= cyWinSize - MARGIN)
|
|
break;
|
|
src = pbImage + yImg * wImgRowBytes;
|
|
dst = pDiData + yWin * wDIRowBytes + cxImgPos * cDIChannels;
|
|
|
|
for (xImg = 0, xWin = cxImgPos; xImg < cxImgSize; xImg++, xWin++)
|
|
{
|
|
if (xWin >= cxWinSize - MARGIN)
|
|
break;
|
|
r = *src++;
|
|
g = *src++;
|
|
b = *src++;
|
|
*dst++ = b; /* note the reverse order */
|
|
*dst++ = g;
|
|
*dst++ = r;
|
|
if (cImgChannels == 4)
|
|
{
|
|
a = *src++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
//-----------------
|
|
// end of source
|
|
//-----------------
|