-//------------------------------------
-// VisualPng.C -- Shows a PNG image
-//------------------------------------
+/*------------------------------------
+ * 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
+ */
-// Copyright 2000, Willem van Schaik.
+/* switches */
-// This code is released under the libpng license.
-// For conditions of distribution and use, see the disclaimer
-// and license in png.h
-
-// switches
-
-// defines
+/* defines */
#define PROGNAME "VisualPng"
#define LONGNAME "Win32 Viewer for PNG-files"
#define VERSION "1.0 of 2000 June 07"
-// constants
+/* constants */
#define MARGIN 8
-// standard includes
+/* standard includes */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <windows.h>
+#include <zlib.h>
-// application includes
+/* application includes */
#include "png.h"
#include "pngfile.h"
#include "resource.h"
-// macros
+/* macros */
-// function prototypes
+/* function prototypes */
LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM);
BOOL CALLBACK AboutDlgProc (HWND, UINT, WPARAM, LPARAM) ;
BYTE *pbImage, int cxImgSize, int cyImgSize, int cImgChannels,
BOOL bStretched);
-// a few global variables
+/* a few global variables */
static char *szProgName = PROGNAME;
static char *szAppName = LONGNAME;
static char *szIconName = PROGNAME;
static char szCmdFileName [MAX_PATH];
-// MAIN routine
+/* MAIN routine */
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIcon (hInstance, szIconName) ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW);
- wndclass.hbrBackground = NULL; // (HBRUSH) GetStockObject (GRAY_BRUSH);
+ wndclass.hbrBackground = NULL; /* (HBRUSH) GetStockObject (GRAY_BRUSH); */
wndclass.lpszMenuName = szProgName;
wndclass.lpszClassName = szProgName;
return 0;
}
- // if filename given on commandline, store it
+ /* if filename given on command line, store it */
if ((szCmdLine != NULL) && (*szCmdLine != '\0'))
if (szCmdLine[0] == '"')
strncpy (szCmdFileName, szCmdLine + 1, strlen(szCmdLine) - 2);
else
strcpy (szCmdFileName, "");
- // calculate size of window-borders
+ /* 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? */
+ 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,
+/* CW_USEDEFAULT, CW_USEDEFAULT, */
NULL, NULL, hInstance, NULL);
ShowWindow (hwnd, iCmdShow);
strcpy (szImgPathName, "");
- // in case we process file given on command-line
+ /* 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
+ /* read the other png-files in the directory for later */
+ /* next/previous commands */
BuildPngList (szImgPathName, &pPngFileList, &iPngFileCount,
&iPngFileIndex);
- // load the image from file
+ /* load the image from file */
if (!LoadImageFile (hwnd, szImgPathName,
&pbImage, &cxImgSize, &cyImgSize, &cImgChannels, &bkgColor))
return 0;
- // invalidate the client area for later update
+ /* invalidate the client area for later update */
InvalidateRect (hwnd, NULL, TRUE);
- // display the PNG into the DIBitmap
+ /* display the PNG into the DIBitmap */
DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
cxWinSize = LOWORD (lParam);
cyWinSize = HIWORD (lParam);
- // invalidate the client area for later update
+ /* invalidate the client area for later update */
InvalidateRect (hwnd, NULL, TRUE);
- // display the PNG into the DIBitmap
+ /* display the PNG into the DIBitmap */
DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
{
case IDM_FILE_OPEN:
- // show the File Open dialog box
+ /* 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
+ /* read the other png-files in the directory for later */
+ /* next/previous commands */
BuildPngList (szImgPathName, &pPngFileList, &iPngFileCount,
&iPngFileIndex);
- // load the image from file
+ /* load the image from file */
if (!LoadImageFile (hwnd, szImgPathName,
&pbImage, &cxImgSize, &cyImgSize, &cImgChannels, &bkgColor))
return 0;
- // invalidate the client area for later update
+ /* invalidate the client area for later update */
InvalidateRect (hwnd, NULL, TRUE);
- // display the PNG into the DIBitmap
+ /* display the PNG into the DIBitmap */
DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
case IDM_FILE_SAVE:
- // show the File Save dialog box
+ /* show the File Save dialog box */
if (!PngFileSaveDlg (hwnd, szImgPathName, szTitleName))
return 0;
- // save the PNG to a disk file
+ /* save the PNG to a disk file */
SetCursor (LoadCursor (NULL, IDC_WAIT));
ShowCursor (TRUE);
case IDM_FILE_NEXT:
- // read next entry in the directory
+ /* read next entry in the directory */
if (SearchPngList (pPngFileList, iPngFileCount, &iPngFileIndex,
NULL, szImgPathName))
{
if (strcmp (szImgPathName, "") == 0)
return 0;
-
- // load the image from file
-
+
+ /* load the image from file */
+
if (!LoadImageFile (hwnd, szImgPathName, &pbImage,
&cxImgSize, &cyImgSize, &cImgChannels, &bkgColor))
return 0;
-
- // invalidate the client area for later update
-
+
+ /* invalidate the client area for later update */
+
InvalidateRect (hwnd, NULL, TRUE);
-
- // display the PNG into the DIBitmap
-
+
+ /* 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
+ /* read previous entry in the directory */
if (SearchPngList (pPngFileList, iPngFileCount, &iPngFileIndex,
szImgPathName, NULL))
{
-
+
if (strcmp (szImgPathName, "") == 0)
return 0;
-
- // load the image from file
-
+
+ /* load the image from file */
+
if (!LoadImageFile (hwnd, szImgPathName, &pbImage, &cxImgSize,
&cyImgSize, &cImgChannels, &bkgColor))
return 0;
-
- // invalidate the client area for later update
-
+
+ /* invalidate the client area for later update */
+
InvalidateRect (hwnd, NULL, TRUE);
-
- // display the PNG into the DIBitmap
-
+
+ /* display the PNG into the DIBitmap */
+
DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
}
case IDM_FILE_EXIT:
- // more cleanup needed...
+ /* more cleanup needed... */
- // free image buffer
+ /* free image buffer */
if (pDib != NULL)
{
pDib = NULL;
}
- // free file-list
+ /* free file-list */
if (pPngFileList != NULL)
{
pPngFileList = NULL;
}
- // let's go ...
+ /* let's go ... */
exit (0);
else
CheckMenuItem (hMenu, IDM_OPTIONS_STRETCH, MF_UNCHECKED);
- // invalidate the client area for later update
+ /* invalidate the client area for later update */
InvalidateRect (hwnd, NULL, TRUE);
- // display the PNG into the DIBitmap
+ /* display the PNG into the DIBitmap */
DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
DialogBox (hInstance, TEXT ("AboutBox"), hwnd, AboutDlgProc) ;
return 0;
- } // end switch
+ } /* end switch */
break;
return FALSE ;
}
-//---------------
-// CenterAbout
-//---------------
-
+/*---------------
+ * CenterAbout
+ *---------------
+ */
BOOL CenterAbout (HWND hwndChild, HWND hwndParent)
{
RECT rChild, rParent, rWorkArea;
int xNew, yNew;
BOOL bResult;
- // Get the Height and Width of the child window
+ /* 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
+ /* 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'
+ /* Get the limits of the 'workarea' */
bResult = SystemParametersInfo(
- SPI_GETWORKAREA, // system parameter to query or set
+ SPI_GETWORKAREA, /* system parameter to query or set */
sizeof(RECT),
&rWorkArea,
0);
rWorkArea.bottom = GetSystemMetrics(SM_CYSCREEN);
}
- // Calculate new X position, then adjust for workarea
+ /* Calculate new X position, then adjust for workarea */
xNew = rParent.left + ((wParent - wChild) /2);
if (xNew < rWorkArea.left) {
xNew = rWorkArea.left;
xNew = rWorkArea.right - wChild;
}
- // Calculate new Y position, then adjust for workarea
+ /* Calculate new Y position, then adjust for workarea */
yNew = rParent.top + ((hParent - hChild) /2);
if (yNew < rWorkArea.top) {
yNew = rWorkArea.top;
yNew = rWorkArea.bottom - hChild;
}
- // Set it, and return
+ /* Set it, and return */
return SetWindowPos (hwndChild, NULL, xNew, yNew, 0, 0, SWP_NOSIZE |
SWP_NOZORDER);
}
-//----------------
-// BuildPngList
-//----------------
-
+/*----------------
+ * BuildPngList
+ *----------------
+ */
BOOL BuildPngList (PTSTR pstrPathName, TCHAR **ppFileList, int *pFileCount,
int *pFileIndex)
{
int i, ii;
int j, jj;
- // free previous file-list
+ /* free previous file-list */
if (*ppFileList != NULL)
{
*ppFileList = NULL;
}
- // extract foldername, filename and search-name
+ /* extract foldername, filename and search-name */
strcpy (szImgPathName, pstrPathName);
strcpy (szImgFileName, strrchr (pstrPathName, '\\') + 1);
*(strrchr (szImgFindName, '\\') + 1) = '\0';
strcat (szImgFindName, "*.png");
- // first cycle: count number of files in directory for memory allocation
+ /* first cycle: count number of files in directory for memory allocation */
*pFileCount = 0;
}
FindClose(hFind);
- // allocation memory for file-list
+ /* allocation memory for file-list */
*ppFileList = (TCHAR *) malloc (*pFileCount * MAX_PATH);
- // second cycle: read directory and store filenames in file-list
+ /* second cycle: read directory and store filenames in file-list */
hFind = FindFirstFile(szImgFindName, &finddata);
bOk = (hFind != (HANDLE) -1);
}
FindClose(hFind);
- // finally we must sort the file-list
+ /* finally we must sort the file-list */
for (i = 0; i < *pFileCount - 1; i++)
{
strcpy (*ppFileList + jj, *ppFileList + ii);
strcpy (*ppFileList + ii, szTmp);
- // check if this was the current image that we moved
+ /* check if this was the current image that we moved */
if (*pFileIndex == i)
*pFileIndex = j;
return TRUE;
}
-//----------------
-// SearchPngList
-//----------------
+/*----------------
+ * SearchPngList
+ *----------------
+ */
BOOL SearchPngList (
TCHAR *pFileList, int FileCount, int *pFileIndex,
{
if (FileCount > 0)
{
- // get previous entry
-
+ /* get previous entry */
+
if (pstrPrevName != NULL)
{
if (*pFileIndex > 0)
*pFileIndex -= 1;
else
*pFileIndex = FileCount - 1;
-
+
strcpy (pstrPrevName, pFileList + (*pFileIndex * MAX_PATH));
}
-
- // get next entry
-
+
+ /* get next entry */
+
if (pstrNextName != NULL)
{
if (*pFileIndex < FileCount - 1)
*pFileIndex += 1;
else
*pFileIndex = 0;
-
+
strcpy (pstrNextName, pFileList + (*pFileIndex * MAX_PATH));
}
-
+
return TRUE;
}
else
}
}
-//-----------------
-// LoadImageFile
-//-----------------
+/*-----------------
+ * LoadImageFile
+ *-----------------
+ */
BOOL LoadImageFile (HWND hwnd, PTSTR pstrPathName,
png_byte **ppbImage, int *pxImgSize, int *pyImgSize,
{
static TCHAR szTmp [MAX_PATH];
- // if there's an existing PNG, free the memory
+ /* if there's an existing PNG, free the memory */
if (*ppbImage)
{
*ppbImage = NULL;
}
- // Load the entire PNG into memory
+ /* Load the entire PNG into memory */
SetCursor (LoadCursor (NULL, IDC_WAIT));
ShowCursor (TRUE);
return TRUE;
}
-//----------------
-// DisplayImage
-//----------------
-
+/*----------------
+ * DisplayImage
+ *----------------
+ */
BOOL DisplayImage (HWND hwnd, BYTE **ppDib,
BYTE **ppDiData, int cxWinSize, int cyWinSize,
BYTE *pbImage, int cxImgSize, int cyImgSize, int cImgChannels,
{
BYTE *pDib = *ppDib;
BYTE *pDiData = *ppDiData;
- // BITMAPFILEHEADER *pbmfh;
+ /* 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
+ /* allocate memory for the Device Independent bitmap */
wDIRowBytes = (WORD) ((3 * cxWinSize + 3L) >> 2) << 2;
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)))
{
*ppDib = pDib;
memset (pDib, 0, sizeof(BITMAPINFOHEADER));
- // initialize the dib-structure
+ /* initialize the dib-structure */
pbmih = (BITMAPINFOHEADER *) pDib;
pbmih->biSize = sizeof(BITMAPINFOHEADER);
pDiData = pDib + sizeof(BITMAPINFOHEADER);
*ppDiData = pDiData;
- // first fill bitmap with gray and image border
+ /* first fill bitmap with gray and image border */
InitBitmap (pDiData, cxWinSize, cyWinSize);
- // then fill bitmap with image
+ /* then fill bitmap with image */
if (pbImage)
{
return TRUE;
}
-//--------------
-// InitBitmap
-//--------------
-
+/*--------------
+ * InitBitmap
+ *--------------
+ */
BOOL InitBitmap (BYTE *pDiData, int cxWinSize, int cyWinSize)
{
BYTE *dst;
int x, y, col;
- // initialize the background with gray
+ /* initialize the background with gray */
dst = pDiData;
for (y = 0; y < cyWinSize; y++)
col = 0;
for (x = 0; x < cxWinSize; x++)
{
- // fill with GRAY
+ /* fill with GRAY */
*dst++ = 127;
*dst++ = 127;
*dst++ = 127;
col += 3;
}
- // rows start on 4 byte boundaries
+ /* rows start on 4 byte boundaries */
while ((col % 4) != 0)
{
dst++;
return TRUE;
}
-//--------------
-// FillBitmap
-//--------------
-
+/*--------------
+ * FillBitmap
+ *--------------
+ */
BOOL FillBitmap (
BYTE *pDiData, int cxWinSize, int cyWinSize,
BYTE *pbImage, int cxImgSize, int cyImgSize, int cImgChannels,
cxNewSize = cxWinSize - 2 * MARGIN;
cyNewSize = cyWinSize - 2 * MARGIN;
- // stretch the image to it's window determined size
+ /* 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))
+ /* 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 = (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;
}
}
- // calculate row-bytes
+ /* calculate row-bytes */
wImgRowBytes = cImgChannels * cxNewSize;
wDIRowBytes = (WORD) ((cDIChannels * cxWinSize + 3L) >> 2) << 2;
- // copy image to screen
+ /* copy image to screen */
for (yImg = 0, yWin = cyImgPos; yImg < cyNewSize; yImg++, yWin++)
{
r = *src++;
g = *src++;
b = *src++;
- *dst++ = b; /* note the reverse order */
+ *dst++ = b; /* note the reverse order */
*dst++ = g;
*dst++ = r;
if (cImgChannels == 4)
}
}
- // free memory
+ /* free memory */
if (pStretchedImage != NULL)
{
}
- // process the image not-stretched
+ /* process the image not-stretched */
else
{
- // calculate the central position
+ /* calculate the central position */
cxImgPos = (cxWinSize - cxImgSize) / 2;
cyImgPos = (cyWinSize - cyImgSize) / 2;
- // check for image larger than window
+ /* check for image larger than window */
if (cxImgPos < MARGIN)
cxImgPos = MARGIN;
if (cyImgPos < MARGIN)
cyImgPos = MARGIN;
- // calculate both row-bytes
+ /* calculate both row-bytes */
wImgRowBytes = cImgChannels * cxImgSize;
wDIRowBytes = (WORD) ((cDIChannels * cxWinSize + 3L) >> 2) << 2;
- // copy image to screen
+ /* copy image to screen */
for (yImg = 0, yWin = cyImgPos; yImg < cyImgSize; yImg++, yWin++)
{
r = *src++;
g = *src++;
b = *src++;
- *dst++ = b; /* note the reverse order */
+ *dst++ = b; /* note the reverse order */
*dst++ = g;
*dst++ = r;
if (cImgChannels == 4)
return TRUE;
}
-//-----------------
-// end of source
-//-----------------
+/*-----------------
+ * end of source
+ *-----------------
+ */
projects / platform / upstream / libpng.git / blobdiff