mirror of
https://git.do.srb2.org/STJr/SRB2.git
synced 2024-12-25 04:00:47 +00:00
978 lines
26 KiB
C
978 lines
26 KiB
C
/*------------------------------------
|
|
* VisualPng.C -- Shows a PNG image
|
|
*------------------------------------
|
|
*
|
|
* Copyright 2000,2017 Willem van Schaik.
|
|
*
|
|
* This code is released under the libpng license.
|
|
* For conditions of distribution and use, see the disclaimer
|
|
* and license in png.h
|
|
*/
|
|
|
|
/* switches */
|
|
|
|
/* defines */
|
|
|
|
#define PROGNAME "VisualPng"
|
|
#define LONGNAME "Win32 Viewer for PNG-files"
|
|
#define VERSION "1.0 of 2000 June 07"
|
|
|
|
/* constants */
|
|
|
|
#define MARGIN 8
|
|
|
|
/* standard includes */
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <windows.h>
|
|
#include <zlib.h>
|
|
|
|
/* application includes */
|
|
|
|
#include "png.h"
|
|
#include "pngfile.h"
|
|
#include "resource.h"
|
|
|
|
/* macros */
|
|
|
|
/* function prototypes */
|
|
|
|
LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM);
|
|
BOOL CALLBACK AboutDlgProc (HWND, UINT, WPARAM, LPARAM) ;
|
|
|
|
BOOL CenterAbout (HWND hwndChild, HWND hwndParent);
|
|
|
|
BOOL BuildPngList (PTSTR pstrPathName, TCHAR **ppFileList, int *pFileCount,
|
|
int *pFileIndex);
|
|
|
|
BOOL SearchPngList (TCHAR *pFileList, int FileCount, int *pFileIndex,
|
|
PTSTR pstrPrevName, PTSTR pstrNextName);
|
|
|
|
BOOL LoadImageFile(HWND hwnd, PTSTR pstrPathName,
|
|
png_byte **ppbImage, int *pxImgSize, int *pyImgSize, int *piChannels,
|
|
png_color *pBkgColor);
|
|
|
|
BOOL DisplayImage (HWND hwnd, BYTE **ppDib,
|
|
BYTE **ppDiData, int cxWinSize, int cyWinSize,
|
|
BYTE *pbImage, int cxImgSize, int cyImgSize, int cImgChannels,
|
|
BOOL bStretched);
|
|
|
|
BOOL InitBitmap (
|
|
BYTE *pDiData, int cxWinSize, int cyWinSize);
|
|
|
|
BOOL FillBitmap (
|
|
BYTE *pDiData, int cxWinSize, int cyWinSize,
|
|
BYTE *pbImage, int cxImgSize, int cyImgSize, int cImgChannels,
|
|
BOOL bStretched);
|
|
|
|
/* a few global variables */
|
|
|
|
static char *szProgName = PROGNAME;
|
|
static char *szAppName = LONGNAME;
|
|
static char *szIconName = PROGNAME;
|
|
static char szCmdFileName [MAX_PATH];
|
|
|
|
/* MAIN routine */
|
|
|
|
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
|
|
PSTR szCmdLine, int iCmdShow)
|
|
{
|
|
HACCEL hAccel;
|
|
HWND hwnd;
|
|
MSG msg;
|
|
WNDCLASS wndclass;
|
|
int ixBorders, iyBorders;
|
|
|
|
wndclass.style = CS_HREDRAW | CS_VREDRAW;
|
|
wndclass.lpfnWndProc = WndProc;
|
|
wndclass.cbClsExtra = 0;
|
|
wndclass.cbWndExtra = 0;
|
|
wndclass.hInstance = hInstance;
|
|
wndclass.hIcon = LoadIcon (hInstance, szIconName) ;
|
|
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW);
|
|
wndclass.hbrBackground = NULL; /* (HBRUSH) GetStockObject (GRAY_BRUSH); */
|
|
wndclass.lpszMenuName = szProgName;
|
|
wndclass.lpszClassName = szProgName;
|
|
|
|
if (!RegisterClass (&wndclass))
|
|
{
|
|
MessageBox (NULL, TEXT ("Error: this program requires Windows NT!"),
|
|
szProgName, MB_ICONERROR);
|
|
return 0;
|
|
}
|
|
|
|
/* if filename given on commandline, store it */
|
|
if ((szCmdLine != NULL) && (*szCmdLine != '\0'))
|
|
if (szCmdLine[0] == '"')
|
|
strncpy (szCmdFileName, szCmdLine + 1, strlen(szCmdLine) - 2);
|
|
else
|
|
strcpy (szCmdFileName, szCmdLine);
|
|
else
|
|
strcpy (szCmdFileName, "");
|
|
|
|
/* calculate size of window-borders */
|
|
ixBorders = 2 * (GetSystemMetrics (SM_CXBORDER) +
|
|
GetSystemMetrics (SM_CXDLGFRAME));
|
|
iyBorders = 2 * (GetSystemMetrics (SM_CYBORDER) +
|
|
GetSystemMetrics (SM_CYDLGFRAME)) +
|
|
GetSystemMetrics (SM_CYCAPTION) +
|
|
GetSystemMetrics (SM_CYMENUSIZE) +
|
|
1; /* WvS: don't ask me why? */
|
|
|
|
hwnd = CreateWindow (szProgName, szAppName,
|
|
WS_OVERLAPPEDWINDOW,
|
|
CW_USEDEFAULT, CW_USEDEFAULT,
|
|
512 + 2 * MARGIN + ixBorders, 384 + 2 * MARGIN + iyBorders,
|
|
/* CW_USEDEFAULT, CW_USEDEFAULT, */
|
|
NULL, NULL, hInstance, NULL);
|
|
|
|
ShowWindow (hwnd, iCmdShow);
|
|
UpdateWindow (hwnd);
|
|
|
|
hAccel = LoadAccelerators (hInstance, szProgName);
|
|
|
|
while (GetMessage (&msg, NULL, 0, 0))
|
|
{
|
|
if (!TranslateAccelerator (hwnd, hAccel, &msg))
|
|
{
|
|
TranslateMessage (&msg);
|
|
DispatchMessage (&msg);
|
|
}
|
|
}
|
|
return msg.wParam;
|
|
}
|
|
|
|
LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam,
|
|
LPARAM lParam)
|
|
{
|
|
static HINSTANCE hInstance ;
|
|
static HDC hdc;
|
|
static PAINTSTRUCT ps;
|
|
static HMENU hMenu;
|
|
|
|
static BITMAPFILEHEADER *pbmfh;
|
|
static BITMAPINFOHEADER *pbmih;
|
|
static BYTE *pbImage;
|
|
static int cxWinSize, cyWinSize;
|
|
static int cxImgSize, cyImgSize;
|
|
static int cImgChannels;
|
|
static png_color bkgColor = {127, 127, 127};
|
|
|
|
static BOOL bStretched = TRUE;
|
|
|
|
static BYTE *pDib = NULL;
|
|
static BYTE *pDiData = NULL;
|
|
|
|
static TCHAR szImgPathName [MAX_PATH];
|
|
static TCHAR szTitleName [MAX_PATH];
|
|
|
|
static TCHAR *pPngFileList = NULL;
|
|
static int iPngFileCount;
|
|
static int iPngFileIndex;
|
|
|
|
BOOL bOk;
|
|
|
|
switch (message)
|
|
{
|
|
case WM_CREATE:
|
|
hInstance = ((LPCREATESTRUCT) lParam)->hInstance ;
|
|
PngFileInitialize (hwnd);
|
|
|
|
strcpy (szImgPathName, "");
|
|
|
|
/* in case we process file given on command-line */
|
|
|
|
if (szCmdFileName[0] != '\0')
|
|
{
|
|
strcpy (szImgPathName, szCmdFileName);
|
|
|
|
/* read the other png-files in the directory for later */
|
|
/* next/previous commands */
|
|
|
|
BuildPngList (szImgPathName, &pPngFileList, &iPngFileCount,
|
|
&iPngFileIndex);
|
|
|
|
/* load the image from file */
|
|
|
|
if (!LoadImageFile (hwnd, szImgPathName,
|
|
&pbImage, &cxImgSize, &cyImgSize, &cImgChannels, &bkgColor))
|
|
return 0;
|
|
|
|
/* invalidate the client area for later update */
|
|
|
|
InvalidateRect (hwnd, NULL, TRUE);
|
|
|
|
/* display the PNG into the DIBitmap */
|
|
|
|
DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
|
|
pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
|
|
}
|
|
|
|
return 0;
|
|
|
|
case WM_SIZE:
|
|
cxWinSize = LOWORD (lParam);
|
|
cyWinSize = HIWORD (lParam);
|
|
|
|
/* invalidate the client area for later update */
|
|
|
|
InvalidateRect (hwnd, NULL, TRUE);
|
|
|
|
/* display the PNG into the DIBitmap */
|
|
|
|
DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
|
|
pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
|
|
|
|
return 0;
|
|
|
|
case WM_INITMENUPOPUP:
|
|
hMenu = GetMenu (hwnd);
|
|
|
|
if (pbImage)
|
|
EnableMenuItem (hMenu, IDM_FILE_SAVE, MF_ENABLED);
|
|
else
|
|
EnableMenuItem (hMenu, IDM_FILE_SAVE, MF_GRAYED);
|
|
|
|
return 0;
|
|
|
|
case WM_COMMAND:
|
|
hMenu = GetMenu (hwnd);
|
|
|
|
switch (LOWORD (wParam))
|
|
{
|
|
case IDM_FILE_OPEN:
|
|
|
|
/* show the File Open dialog box */
|
|
|
|
if (!PngFileOpenDlg (hwnd, szImgPathName, szTitleName))
|
|
return 0;
|
|
|
|
/* read the other png-files in the directory for later */
|
|
/* next/previous commands */
|
|
|
|
BuildPngList (szImgPathName, &pPngFileList, &iPngFileCount,
|
|
&iPngFileIndex);
|
|
|
|
/* load the image from file */
|
|
|
|
if (!LoadImageFile (hwnd, szImgPathName,
|
|
&pbImage, &cxImgSize, &cyImgSize, &cImgChannels, &bkgColor))
|
|
return 0;
|
|
|
|
/* invalidate the client area for later update */
|
|
|
|
InvalidateRect (hwnd, NULL, TRUE);
|
|
|
|
/* display the PNG into the DIBitmap */
|
|
|
|
DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
|
|
pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
|
|
|
|
return 0;
|
|
|
|
case IDM_FILE_SAVE:
|
|
|
|
/* show the File Save dialog box */
|
|
|
|
if (!PngFileSaveDlg (hwnd, szImgPathName, szTitleName))
|
|
return 0;
|
|
|
|
/* save the PNG to a disk file */
|
|
|
|
SetCursor (LoadCursor (NULL, IDC_WAIT));
|
|
ShowCursor (TRUE);
|
|
|
|
bOk = PngSaveImage (szImgPathName, pDiData, cxWinSize, cyWinSize,
|
|
bkgColor);
|
|
|
|
ShowCursor (FALSE);
|
|
SetCursor (LoadCursor (NULL, IDC_ARROW));
|
|
|
|
if (!bOk)
|
|
MessageBox (hwnd, TEXT ("Error in saving the PNG image"),
|
|
szProgName, MB_ICONEXCLAMATION | MB_OK);
|
|
return 0;
|
|
|
|
case IDM_FILE_NEXT:
|
|
|
|
/* read next entry in the directory */
|
|
|
|
if (SearchPngList (pPngFileList, iPngFileCount, &iPngFileIndex,
|
|
NULL, szImgPathName))
|
|
{
|
|
if (strcmp (szImgPathName, "") == 0)
|
|
return 0;
|
|
|
|
/* load the image from file */
|
|
|
|
if (!LoadImageFile (hwnd, szImgPathName, &pbImage,
|
|
&cxImgSize, &cyImgSize, &cImgChannels, &bkgColor))
|
|
return 0;
|
|
|
|
/* invalidate the client area for later update */
|
|
|
|
InvalidateRect (hwnd, NULL, TRUE);
|
|
|
|
/* display the PNG into the DIBitmap */
|
|
|
|
DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
|
|
pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
|
|
}
|
|
|
|
return 0;
|
|
|
|
case IDM_FILE_PREVIOUS:
|
|
|
|
/* read previous entry in the directory */
|
|
|
|
if (SearchPngList (pPngFileList, iPngFileCount, &iPngFileIndex,
|
|
szImgPathName, NULL))
|
|
{
|
|
|
|
if (strcmp (szImgPathName, "") == 0)
|
|
return 0;
|
|
|
|
/* load the image from file */
|
|
|
|
if (!LoadImageFile (hwnd, szImgPathName, &pbImage, &cxImgSize,
|
|
&cyImgSize, &cImgChannels, &bkgColor))
|
|
return 0;
|
|
|
|
/* invalidate the client area for later update */
|
|
|
|
InvalidateRect (hwnd, NULL, TRUE);
|
|
|
|
/* display the PNG into the DIBitmap */
|
|
|
|
DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
|
|
pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
|
|
}
|
|
|
|
return 0;
|
|
|
|
case IDM_FILE_EXIT:
|
|
|
|
/* more cleanup needed... */
|
|
|
|
/* free image buffer */
|
|
|
|
if (pDib != NULL)
|
|
{
|
|
free (pDib);
|
|
pDib = NULL;
|
|
}
|
|
|
|
/* free file-list */
|
|
|
|
if (pPngFileList != NULL)
|
|
{
|
|
free (pPngFileList);
|
|
pPngFileList = NULL;
|
|
}
|
|
|
|
/* let's go ... */
|
|
|
|
exit (0);
|
|
|
|
return 0;
|
|
|
|
case IDM_OPTIONS_STRETCH:
|
|
bStretched = !bStretched;
|
|
if (bStretched)
|
|
CheckMenuItem (hMenu, IDM_OPTIONS_STRETCH, MF_CHECKED);
|
|
else
|
|
CheckMenuItem (hMenu, IDM_OPTIONS_STRETCH, MF_UNCHECKED);
|
|
|
|
/* invalidate the client area for later update */
|
|
|
|
InvalidateRect (hwnd, NULL, TRUE);
|
|
|
|
/* display the PNG into the DIBitmap */
|
|
|
|
DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
|
|
pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
|
|
|
|
return 0;
|
|
|
|
case IDM_HELP_ABOUT:
|
|
DialogBox (hInstance, TEXT ("AboutBox"), hwnd, AboutDlgProc) ;
|
|
return 0;
|
|
|
|
} /* end switch */
|
|
|
|
break;
|
|
|
|
case WM_PAINT:
|
|
hdc = BeginPaint (hwnd, &ps);
|
|
|
|
if (pDib)
|
|
SetDIBitsToDevice (hdc, 0, 0, cxWinSize, cyWinSize, 0, 0,
|
|
0, cyWinSize, pDiData, (BITMAPINFO *) pDib, DIB_RGB_COLORS);
|
|
|
|
EndPaint (hwnd, &ps);
|
|
return 0;
|
|
|
|
case WM_DESTROY:
|
|
if (pbmfh)
|
|
{
|
|
free (pbmfh);
|
|
pbmfh = NULL;
|
|
}
|
|
|
|
PostQuitMessage (0);
|
|
return 0;
|
|
}
|
|
|
|
return DefWindowProc (hwnd, message, wParam, lParam);
|
|
}
|
|
|
|
BOOL CALLBACK AboutDlgProc (HWND hDlg, UINT message,
|
|
WPARAM wParam, LPARAM lParam)
|
|
{
|
|
switch (message)
|
|
{
|
|
case WM_INITDIALOG :
|
|
ShowWindow (hDlg, SW_HIDE);
|
|
CenterAbout (hDlg, GetWindow (hDlg, GW_OWNER));
|
|
ShowWindow (hDlg, SW_SHOW);
|
|
return TRUE ;
|
|
|
|
case WM_COMMAND :
|
|
switch (LOWORD (wParam))
|
|
{
|
|
case IDOK :
|
|
case IDCANCEL :
|
|
EndDialog (hDlg, 0) ;
|
|
return TRUE ;
|
|
}
|
|
break ;
|
|
}
|
|
return FALSE ;
|
|
}
|
|
|
|
/*---------------
|
|
* CenterAbout
|
|
*---------------
|
|
*/
|
|
BOOL CenterAbout (HWND hwndChild, HWND hwndParent)
|
|
{
|
|
RECT rChild, rParent, rWorkArea;
|
|
int wChild, hChild, wParent, hParent;
|
|
int xNew, yNew;
|
|
BOOL bResult;
|
|
|
|
/* Get the Height and Width of the child window */
|
|
GetWindowRect (hwndChild, &rChild);
|
|
wChild = rChild.right - rChild.left;
|
|
hChild = rChild.bottom - rChild.top;
|
|
|
|
/* Get the Height and Width of the parent window */
|
|
GetWindowRect (hwndParent, &rParent);
|
|
wParent = rParent.right - rParent.left;
|
|
hParent = rParent.bottom - rParent.top;
|
|
|
|
/* Get the limits of the 'workarea' */
|
|
bResult = SystemParametersInfo(
|
|
SPI_GETWORKAREA, /* system parameter to query or set */
|
|
sizeof(RECT),
|
|
&rWorkArea,
|
|
0);
|
|
if (!bResult) {
|
|
rWorkArea.left = rWorkArea.top = 0;
|
|
rWorkArea.right = GetSystemMetrics(SM_CXSCREEN);
|
|
rWorkArea.bottom = GetSystemMetrics(SM_CYSCREEN);
|
|
}
|
|
|
|
/* Calculate new X position, then adjust for workarea */
|
|
xNew = rParent.left + ((wParent - wChild) /2);
|
|
if (xNew < rWorkArea.left) {
|
|
xNew = rWorkArea.left;
|
|
} else if ((xNew+wChild) > rWorkArea.right) {
|
|
xNew = rWorkArea.right - wChild;
|
|
}
|
|
|
|
/* Calculate new Y position, then adjust for workarea */
|
|
yNew = rParent.top + ((hParent - hChild) /2);
|
|
if (yNew < rWorkArea.top) {
|
|
yNew = rWorkArea.top;
|
|
} else if ((yNew+hChild) > rWorkArea.bottom) {
|
|
yNew = rWorkArea.bottom - hChild;
|
|
}
|
|
|
|
/* Set it, and return */
|
|
return SetWindowPos (hwndChild, NULL, xNew, yNew, 0, 0, SWP_NOSIZE |
|
|
SWP_NOZORDER);
|
|
}
|
|
|
|
/*----------------
|
|
* BuildPngList
|
|
*----------------
|
|
*/
|
|
BOOL BuildPngList (PTSTR pstrPathName, TCHAR **ppFileList, int *pFileCount,
|
|
int *pFileIndex)
|
|
{
|
|
static TCHAR szImgPathName [MAX_PATH];
|
|
static TCHAR szImgFileName [MAX_PATH];
|
|
static TCHAR szImgFindName [MAX_PATH];
|
|
|
|
WIN32_FIND_DATA finddata;
|
|
HANDLE hFind;
|
|
|
|
static TCHAR szTmp [MAX_PATH];
|
|
BOOL bOk;
|
|
int i, ii;
|
|
int j, jj;
|
|
|
|
/* free previous file-list */
|
|
|
|
if (*ppFileList != NULL)
|
|
{
|
|
free (*ppFileList);
|
|
*ppFileList = NULL;
|
|
}
|
|
|
|
/* extract foldername, filename and search-name */
|
|
|
|
strcpy (szImgPathName, pstrPathName);
|
|
strcpy (szImgFileName, strrchr (pstrPathName, '\\') + 1);
|
|
|
|
strcpy (szImgFindName, szImgPathName);
|
|
*(strrchr (szImgFindName, '\\') + 1) = '\0';
|
|
strcat (szImgFindName, "*.png");
|
|
|
|
/* first cycle: count number of files in directory for memory allocation */
|
|
|
|
*pFileCount = 0;
|
|
|
|
hFind = FindFirstFile(szImgFindName, &finddata);
|
|
bOk = (hFind != (HANDLE) -1);
|
|
|
|
while (bOk)
|
|
{
|
|
*pFileCount += 1;
|
|
bOk = FindNextFile(hFind, &finddata);
|
|
}
|
|
FindClose(hFind);
|
|
|
|
/* allocation memory for file-list */
|
|
|
|
*ppFileList = (TCHAR *) malloc (*pFileCount * MAX_PATH);
|
|
|
|
/* 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 Independent bitmap */
|
|
|
|
wDIRowBytes = (WORD) ((3 * cxWinSize + 3L) >> 2) << 2;
|
|
|
|
if (pDib)
|
|
{
|
|
free (pDib);
|
|
pDib = NULL;
|
|
}
|
|
|
|
if (cyWinSize > ((size_t)(-1))/wDIRowBytes) {
|
|
{
|
|
MessageBox (hwnd, TEXT ("Visual PNG: image is too big");
|
|
}
|
|
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 mathematically 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;
|
|
}
|
|
|
|
if (cyNewSize > ((size_t)(-1))/(cImgChannels * cxNewSize)) {
|
|
{
|
|
MessageBox (hwnd, TEXT ("Visual PNG: stretched image is too big");
|
|
}
|
|
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
|
|
*-----------------
|
|
*/
|