|
1 //------------------------------------ |
|
2 // VisualPng.C -- Shows a PNG image |
|
3 //------------------------------------ |
|
4 |
|
5 // Copyright 2000, Willem van Schaik. For conditions of distribution and |
|
6 // use, see the copyright/license/disclaimer notice in png.h |
|
7 |
|
8 // switches |
|
9 |
|
10 // defines |
|
11 |
|
12 #define PROGNAME "VisualPng" |
|
13 #define LONGNAME "Win32 Viewer for PNG-files" |
|
14 #define VERSION "1.0 of 2000 June 07" |
|
15 |
|
16 // constants |
|
17 |
|
18 #define MARGIN 8 |
|
19 |
|
20 // standard includes |
|
21 |
|
22 #include <stdio.h> |
|
23 #include <stdlib.h> |
|
24 #include <string.h> |
|
25 #include <windows.h> |
|
26 |
|
27 // application includes |
|
28 |
|
29 #include "png.h" |
|
30 #include "pngfile.h" |
|
31 #include "resource.h" |
|
32 |
|
33 // macros |
|
34 |
|
35 // function prototypes |
|
36 |
|
37 LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM); |
|
38 BOOL CALLBACK AboutDlgProc (HWND, UINT, WPARAM, LPARAM) ; |
|
39 |
|
40 BOOL CenterAbout (HWND hwndChild, HWND hwndParent); |
|
41 |
|
42 BOOL BuildPngList (PTSTR pstrPathName, TCHAR **ppFileList, int *pFileCount, |
|
43 int *pFileIndex); |
|
44 |
|
45 BOOL SearchPngList (TCHAR *pFileList, int FileCount, int *pFileIndex, |
|
46 PTSTR pstrPrevName, PTSTR pstrNextName); |
|
47 |
|
48 BOOL LoadImageFile(HWND hwnd, PTSTR pstrPathName, |
|
49 png_byte **ppbImage, int *pxImgSize, int *pyImgSize, int *piChannels, |
|
50 png_color *pBkgColor); |
|
51 |
|
52 BOOL DisplayImage (HWND hwnd, BYTE **ppDib, |
|
53 BYTE **ppDiData, int cxWinSize, int cyWinSize, |
|
54 BYTE *pbImage, int cxImgSize, int cyImgSize, int cImgChannels, |
|
55 BOOL bStretched); |
|
56 |
|
57 BOOL InitBitmap ( |
|
58 BYTE *pDiData, int cxWinSize, int cyWinSize); |
|
59 |
|
60 BOOL FillBitmap ( |
|
61 BYTE *pDiData, int cxWinSize, int cyWinSize, |
|
62 BYTE *pbImage, int cxImgSize, int cyImgSize, int cImgChannels, |
|
63 BOOL bStretched); |
|
64 |
|
65 // a few global variables |
|
66 |
|
67 static char *szProgName = PROGNAME; |
|
68 static char *szAppName = LONGNAME; |
|
69 static char *szIconName = PROGNAME; |
|
70 static char szCmdFileName [MAX_PATH]; |
|
71 |
|
72 // MAIN routine |
|
73 |
|
74 int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, |
|
75 PSTR szCmdLine, int iCmdShow) |
|
76 { |
|
77 HACCEL hAccel; |
|
78 HWND hwnd; |
|
79 MSG msg; |
|
80 WNDCLASS wndclass; |
|
81 int ixBorders, iyBorders; |
|
82 |
|
83 wndclass.style = CS_HREDRAW | CS_VREDRAW; |
|
84 wndclass.lpfnWndProc = WndProc; |
|
85 wndclass.cbClsExtra = 0; |
|
86 wndclass.cbWndExtra = 0; |
|
87 wndclass.hInstance = hInstance; |
|
88 wndclass.hIcon = LoadIcon (hInstance, szIconName) ; |
|
89 wndclass.hCursor = LoadCursor (NULL, IDC_ARROW); |
|
90 wndclass.hbrBackground = NULL; // (HBRUSH) GetStockObject (GRAY_BRUSH); |
|
91 wndclass.lpszMenuName = szProgName; |
|
92 wndclass.lpszClassName = szProgName; |
|
93 |
|
94 if (!RegisterClass (&wndclass)) |
|
95 { |
|
96 MessageBox (NULL, TEXT ("Error: this program requires Windows NT!"), |
|
97 szProgName, MB_ICONERROR); |
|
98 return 0; |
|
99 } |
|
100 |
|
101 // if filename given on commandline, store it |
|
102 if ((szCmdLine != NULL) && (*szCmdLine != '\0')) |
|
103 if (szCmdLine[0] == '"') |
|
104 strncpy (szCmdFileName, szCmdLine + 1, strlen(szCmdLine) - 2); |
|
105 else |
|
106 strcpy (szCmdFileName, szCmdLine); |
|
107 else |
|
108 strcpy (szCmdFileName, ""); |
|
109 |
|
110 // calculate size of window-borders |
|
111 ixBorders = 2 * (GetSystemMetrics (SM_CXBORDER) + |
|
112 GetSystemMetrics (SM_CXDLGFRAME)); |
|
113 iyBorders = 2 * (GetSystemMetrics (SM_CYBORDER) + |
|
114 GetSystemMetrics (SM_CYDLGFRAME)) + |
|
115 GetSystemMetrics (SM_CYCAPTION) + |
|
116 GetSystemMetrics (SM_CYMENUSIZE) + |
|
117 1; /* WvS: don't ask me why? */ |
|
118 |
|
119 hwnd = CreateWindow (szProgName, szAppName, |
|
120 WS_OVERLAPPEDWINDOW, |
|
121 CW_USEDEFAULT, CW_USEDEFAULT, |
|
122 512 + 2 * MARGIN + ixBorders, 384 + 2 * MARGIN + iyBorders, |
|
123 // CW_USEDEFAULT, CW_USEDEFAULT, |
|
124 NULL, NULL, hInstance, NULL); |
|
125 |
|
126 ShowWindow (hwnd, iCmdShow); |
|
127 UpdateWindow (hwnd); |
|
128 |
|
129 hAccel = LoadAccelerators (hInstance, szProgName); |
|
130 |
|
131 while (GetMessage (&msg, NULL, 0, 0)) |
|
132 { |
|
133 if (!TranslateAccelerator (hwnd, hAccel, &msg)) |
|
134 { |
|
135 TranslateMessage (&msg); |
|
136 DispatchMessage (&msg); |
|
137 } |
|
138 } |
|
139 return msg.wParam; |
|
140 } |
|
141 |
|
142 LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, |
|
143 LPARAM lParam) |
|
144 { |
|
145 static HINSTANCE hInstance ; |
|
146 static HDC hdc; |
|
147 static PAINTSTRUCT ps; |
|
148 static HMENU hMenu; |
|
149 |
|
150 static BITMAPFILEHEADER *pbmfh; |
|
151 static BITMAPINFOHEADER *pbmih; |
|
152 static BYTE *pbImage; |
|
153 static int cxWinSize, cyWinSize; |
|
154 static int cxImgSize, cyImgSize; |
|
155 static int cImgChannels; |
|
156 static png_color bkgColor = {127, 127, 127}; |
|
157 |
|
158 static BOOL bStretched = TRUE; |
|
159 |
|
160 static BYTE *pDib = NULL; |
|
161 static BYTE *pDiData = NULL; |
|
162 |
|
163 static TCHAR szImgPathName [MAX_PATH]; |
|
164 static TCHAR szTitleName [MAX_PATH]; |
|
165 |
|
166 static TCHAR *pPngFileList = NULL; |
|
167 static int iPngFileCount; |
|
168 static int iPngFileIndex; |
|
169 |
|
170 BOOL bOk; |
|
171 |
|
172 switch (message) |
|
173 { |
|
174 case WM_CREATE: |
|
175 hInstance = ((LPCREATESTRUCT) lParam)->hInstance ; |
|
176 PngFileInitialize (hwnd); |
|
177 |
|
178 strcpy (szImgPathName, ""); |
|
179 |
|
180 // in case we process file given on command-line |
|
181 |
|
182 if (szCmdFileName[0] != '\0') |
|
183 { |
|
184 strcpy (szImgPathName, szCmdFileName); |
|
185 |
|
186 // read the other png-files in the directory for later |
|
187 // next/previous commands |
|
188 |
|
189 BuildPngList (szImgPathName, &pPngFileList, &iPngFileCount, |
|
190 &iPngFileIndex); |
|
191 |
|
192 // load the image from file |
|
193 |
|
194 if (!LoadImageFile (hwnd, szImgPathName, |
|
195 &pbImage, &cxImgSize, &cyImgSize, &cImgChannels, &bkgColor)) |
|
196 return 0; |
|
197 |
|
198 // invalidate the client area for later update |
|
199 |
|
200 InvalidateRect (hwnd, NULL, TRUE); |
|
201 |
|
202 // display the PNG into the DIBitmap |
|
203 |
|
204 DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize, |
|
205 pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched); |
|
206 } |
|
207 |
|
208 return 0; |
|
209 |
|
210 case WM_SIZE: |
|
211 cxWinSize = LOWORD (lParam); |
|
212 cyWinSize = HIWORD (lParam); |
|
213 |
|
214 // invalidate the client area for later update |
|
215 |
|
216 InvalidateRect (hwnd, NULL, TRUE); |
|
217 |
|
218 // display the PNG into the DIBitmap |
|
219 |
|
220 DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize, |
|
221 pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched); |
|
222 |
|
223 return 0; |
|
224 |
|
225 case WM_INITMENUPOPUP: |
|
226 hMenu = GetMenu (hwnd); |
|
227 |
|
228 if (pbImage) |
|
229 EnableMenuItem (hMenu, IDM_FILE_SAVE, MF_ENABLED); |
|
230 else |
|
231 EnableMenuItem (hMenu, IDM_FILE_SAVE, MF_GRAYED); |
|
232 |
|
233 return 0; |
|
234 |
|
235 case WM_COMMAND: |
|
236 hMenu = GetMenu (hwnd); |
|
237 |
|
238 switch (LOWORD (wParam)) |
|
239 { |
|
240 case IDM_FILE_OPEN: |
|
241 |
|
242 // show the File Open dialog box |
|
243 |
|
244 if (!PngFileOpenDlg (hwnd, szImgPathName, szTitleName)) |
|
245 return 0; |
|
246 |
|
247 // read the other png-files in the directory for later |
|
248 // next/previous commands |
|
249 |
|
250 BuildPngList (szImgPathName, &pPngFileList, &iPngFileCount, |
|
251 &iPngFileIndex); |
|
252 |
|
253 // load the image from file |
|
254 |
|
255 if (!LoadImageFile (hwnd, szImgPathName, |
|
256 &pbImage, &cxImgSize, &cyImgSize, &cImgChannels, &bkgColor)) |
|
257 return 0; |
|
258 |
|
259 // invalidate the client area for later update |
|
260 |
|
261 InvalidateRect (hwnd, NULL, TRUE); |
|
262 |
|
263 // display the PNG into the DIBitmap |
|
264 |
|
265 DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize, |
|
266 pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched); |
|
267 |
|
268 return 0; |
|
269 |
|
270 case IDM_FILE_SAVE: |
|
271 |
|
272 // show the File Save dialog box |
|
273 |
|
274 if (!PngFileSaveDlg (hwnd, szImgPathName, szTitleName)) |
|
275 return 0; |
|
276 |
|
277 // save the PNG to a disk file |
|
278 |
|
279 SetCursor (LoadCursor (NULL, IDC_WAIT)); |
|
280 ShowCursor (TRUE); |
|
281 |
|
282 bOk = PngSaveImage (szImgPathName, pDiData, cxWinSize, cyWinSize, |
|
283 bkgColor); |
|
284 |
|
285 ShowCursor (FALSE); |
|
286 SetCursor (LoadCursor (NULL, IDC_ARROW)); |
|
287 |
|
288 if (!bOk) |
|
289 MessageBox (hwnd, TEXT ("Error in saving the PNG image"), |
|
290 szProgName, MB_ICONEXCLAMATION | MB_OK); |
|
291 return 0; |
|
292 |
|
293 case IDM_FILE_NEXT: |
|
294 |
|
295 // read next entry in the directory |
|
296 |
|
297 if (SearchPngList (pPngFileList, iPngFileCount, &iPngFileIndex, |
|
298 NULL, szImgPathName)) |
|
299 { |
|
300 if (strcmp (szImgPathName, "") == 0) |
|
301 return 0; |
|
302 |
|
303 // load the image from file |
|
304 |
|
305 if (!LoadImageFile (hwnd, szImgPathName, &pbImage, |
|
306 &cxImgSize, &cyImgSize, &cImgChannels, &bkgColor)) |
|
307 return 0; |
|
308 |
|
309 // invalidate the client area for later update |
|
310 |
|
311 InvalidateRect (hwnd, NULL, TRUE); |
|
312 |
|
313 // display the PNG into the DIBitmap |
|
314 |
|
315 DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize, |
|
316 pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched); |
|
317 } |
|
318 |
|
319 return 0; |
|
320 |
|
321 case IDM_FILE_PREVIOUS: |
|
322 |
|
323 // read previous entry in the directory |
|
324 |
|
325 if (SearchPngList (pPngFileList, iPngFileCount, &iPngFileIndex, |
|
326 szImgPathName, NULL)) |
|
327 { |
|
328 |
|
329 if (strcmp (szImgPathName, "") == 0) |
|
330 return 0; |
|
331 |
|
332 // load the image from file |
|
333 |
|
334 if (!LoadImageFile (hwnd, szImgPathName, &pbImage, &cxImgSize, |
|
335 &cyImgSize, &cImgChannels, &bkgColor)) |
|
336 return 0; |
|
337 |
|
338 // invalidate the client area for later update |
|
339 |
|
340 InvalidateRect (hwnd, NULL, TRUE); |
|
341 |
|
342 // display the PNG into the DIBitmap |
|
343 |
|
344 DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize, |
|
345 pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched); |
|
346 } |
|
347 |
|
348 return 0; |
|
349 |
|
350 case IDM_FILE_EXIT: |
|
351 |
|
352 // more cleanup needed... |
|
353 |
|
354 // free image buffer |
|
355 |
|
356 if (pDib != NULL) |
|
357 { |
|
358 free (pDib); |
|
359 pDib = NULL; |
|
360 } |
|
361 |
|
362 // free file-list |
|
363 |
|
364 if (pPngFileList != NULL) |
|
365 { |
|
366 free (pPngFileList); |
|
367 pPngFileList = NULL; |
|
368 } |
|
369 |
|
370 // let's go ... |
|
371 |
|
372 exit (0); |
|
373 |
|
374 return 0; |
|
375 |
|
376 case IDM_OPTIONS_STRETCH: |
|
377 bStretched = !bStretched; |
|
378 if (bStretched) |
|
379 CheckMenuItem (hMenu, IDM_OPTIONS_STRETCH, MF_CHECKED); |
|
380 else |
|
381 CheckMenuItem (hMenu, IDM_OPTIONS_STRETCH, MF_UNCHECKED); |
|
382 |
|
383 // invalidate the client area for later update |
|
384 |
|
385 InvalidateRect (hwnd, NULL, TRUE); |
|
386 |
|
387 // display the PNG into the DIBitmap |
|
388 |
|
389 DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize, |
|
390 pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched); |
|
391 |
|
392 return 0; |
|
393 |
|
394 case IDM_HELP_ABOUT: |
|
395 DialogBox (hInstance, TEXT ("AboutBox"), hwnd, AboutDlgProc) ; |
|
396 return 0; |
|
397 |
|
398 } // end switch |
|
399 |
|
400 break; |
|
401 |
|
402 case WM_PAINT: |
|
403 hdc = BeginPaint (hwnd, &ps); |
|
404 |
|
405 if (pDib) |
|
406 SetDIBitsToDevice (hdc, 0, 0, cxWinSize, cyWinSize, 0, 0, |
|
407 0, cyWinSize, pDiData, (BITMAPINFO *) pDib, DIB_RGB_COLORS); |
|
408 |
|
409 EndPaint (hwnd, &ps); |
|
410 return 0; |
|
411 |
|
412 case WM_DESTROY: |
|
413 if (pbmfh) |
|
414 { |
|
415 free (pbmfh); |
|
416 pbmfh = NULL; |
|
417 } |
|
418 |
|
419 PostQuitMessage (0); |
|
420 return 0; |
|
421 } |
|
422 |
|
423 return DefWindowProc (hwnd, message, wParam, lParam); |
|
424 } |
|
425 |
|
426 BOOL CALLBACK AboutDlgProc (HWND hDlg, UINT message, |
|
427 WPARAM wParam, LPARAM lParam) |
|
428 { |
|
429 switch (message) |
|
430 { |
|
431 case WM_INITDIALOG : |
|
432 ShowWindow (hDlg, SW_HIDE); |
|
433 CenterAbout (hDlg, GetWindow (hDlg, GW_OWNER)); |
|
434 ShowWindow (hDlg, SW_SHOW); |
|
435 return TRUE ; |
|
436 |
|
437 case WM_COMMAND : |
|
438 switch (LOWORD (wParam)) |
|
439 { |
|
440 case IDOK : |
|
441 case IDCANCEL : |
|
442 EndDialog (hDlg, 0) ; |
|
443 return TRUE ; |
|
444 } |
|
445 break ; |
|
446 } |
|
447 return FALSE ; |
|
448 } |
|
449 |
|
450 //--------------- |
|
451 // CenterAbout |
|
452 //--------------- |
|
453 |
|
454 BOOL CenterAbout (HWND hwndChild, HWND hwndParent) |
|
455 { |
|
456 RECT rChild, rParent, rWorkArea; |
|
457 int wChild, hChild, wParent, hParent; |
|
458 int xNew, yNew; |
|
459 BOOL bResult; |
|
460 |
|
461 // Get the Height and Width of the child window |
|
462 GetWindowRect (hwndChild, &rChild); |
|
463 wChild = rChild.right - rChild.left; |
|
464 hChild = rChild.bottom - rChild.top; |
|
465 |
|
466 // Get the Height and Width of the parent window |
|
467 GetWindowRect (hwndParent, &rParent); |
|
468 wParent = rParent.right - rParent.left; |
|
469 hParent = rParent.bottom - rParent.top; |
|
470 |
|
471 // Get the limits of the 'workarea' |
|
472 bResult = SystemParametersInfo( |
|
473 SPI_GETWORKAREA, // system parameter to query or set |
|
474 sizeof(RECT), |
|
475 &rWorkArea, |
|
476 0); |
|
477 if (!bResult) { |
|
478 rWorkArea.left = rWorkArea.top = 0; |
|
479 rWorkArea.right = GetSystemMetrics(SM_CXSCREEN); |
|
480 rWorkArea.bottom = GetSystemMetrics(SM_CYSCREEN); |
|
481 } |
|
482 |
|
483 // Calculate new X position, then adjust for workarea |
|
484 xNew = rParent.left + ((wParent - wChild) /2); |
|
485 if (xNew < rWorkArea.left) { |
|
486 xNew = rWorkArea.left; |
|
487 } else if ((xNew+wChild) > rWorkArea.right) { |
|
488 xNew = rWorkArea.right - wChild; |
|
489 } |
|
490 |
|
491 // Calculate new Y position, then adjust for workarea |
|
492 yNew = rParent.top + ((hParent - hChild) /2); |
|
493 if (yNew < rWorkArea.top) { |
|
494 yNew = rWorkArea.top; |
|
495 } else if ((yNew+hChild) > rWorkArea.bottom) { |
|
496 yNew = rWorkArea.bottom - hChild; |
|
497 } |
|
498 |
|
499 // Set it, and return |
|
500 return SetWindowPos (hwndChild, NULL, xNew, yNew, 0, 0, SWP_NOSIZE | |
|
501 SWP_NOZORDER); |
|
502 } |
|
503 |
|
504 //---------------- |
|
505 // BuildPngList |
|
506 //---------------- |
|
507 |
|
508 BOOL BuildPngList (PTSTR pstrPathName, TCHAR **ppFileList, int *pFileCount, |
|
509 int *pFileIndex) |
|
510 { |
|
511 static TCHAR szImgPathName [MAX_PATH]; |
|
512 static TCHAR szImgFileName [MAX_PATH]; |
|
513 static TCHAR szImgFindName [MAX_PATH]; |
|
514 |
|
515 WIN32_FIND_DATA finddata; |
|
516 HANDLE hFind; |
|
517 |
|
518 static TCHAR szTmp [MAX_PATH]; |
|
519 BOOL bOk; |
|
520 int i, ii; |
|
521 int j, jj; |
|
522 |
|
523 // free previous file-list |
|
524 |
|
525 if (*ppFileList != NULL) |
|
526 { |
|
527 free (*ppFileList); |
|
528 *ppFileList = NULL; |
|
529 } |
|
530 |
|
531 // extract foldername, filename and search-name |
|
532 |
|
533 strcpy (szImgPathName, pstrPathName); |
|
534 strcpy (szImgFileName, strrchr (pstrPathName, '\\') + 1); |
|
535 |
|
536 strcpy (szImgFindName, szImgPathName); |
|
537 *(strrchr (szImgFindName, '\\') + 1) = '\0'; |
|
538 strcat (szImgFindName, "*.png"); |
|
539 |
|
540 // first cycle: count number of files in directory for memory allocation |
|
541 |
|
542 *pFileCount = 0; |
|
543 |
|
544 hFind = FindFirstFile(szImgFindName, &finddata); |
|
545 bOk = (hFind != (HANDLE) -1); |
|
546 |
|
547 while (bOk) |
|
548 { |
|
549 *pFileCount += 1; |
|
550 bOk = FindNextFile(hFind, &finddata); |
|
551 } |
|
552 FindClose(hFind); |
|
553 |
|
554 // allocation memory for file-list |
|
555 |
|
556 *ppFileList = (TCHAR *) malloc (*pFileCount * MAX_PATH); |
|
557 |
|
558 // second cycle: read directory and store filenames in file-list |
|
559 |
|
560 hFind = FindFirstFile(szImgFindName, &finddata); |
|
561 bOk = (hFind != (HANDLE) -1); |
|
562 |
|
563 i = 0; |
|
564 ii = 0; |
|
565 while (bOk) |
|
566 { |
|
567 strcpy (*ppFileList + ii, szImgPathName); |
|
568 strcpy (strrchr(*ppFileList + ii, '\\') + 1, finddata.cFileName); |
|
569 |
|
570 if (strcmp(pstrPathName, *ppFileList + ii) == 0) |
|
571 *pFileIndex = i; |
|
572 |
|
573 ii += MAX_PATH; |
|
574 i++; |
|
575 |
|
576 bOk = FindNextFile(hFind, &finddata); |
|
577 } |
|
578 FindClose(hFind); |
|
579 |
|
580 // finally we must sort the file-list |
|
581 |
|
582 for (i = 0; i < *pFileCount - 1; i++) |
|
583 { |
|
584 ii = i * MAX_PATH; |
|
585 for (j = i+1; j < *pFileCount; j++) |
|
586 { |
|
587 jj = j * MAX_PATH; |
|
588 if (strcmp (*ppFileList + ii, *ppFileList + jj) > 0) |
|
589 { |
|
590 strcpy (szTmp, *ppFileList + jj); |
|
591 strcpy (*ppFileList + jj, *ppFileList + ii); |
|
592 strcpy (*ppFileList + ii, szTmp); |
|
593 |
|
594 // check if this was the current image that we moved |
|
595 |
|
596 if (*pFileIndex == i) |
|
597 *pFileIndex = j; |
|
598 else |
|
599 if (*pFileIndex == j) |
|
600 *pFileIndex = i; |
|
601 } |
|
602 } |
|
603 } |
|
604 |
|
605 return TRUE; |
|
606 } |
|
607 |
|
608 //---------------- |
|
609 // SearchPngList |
|
610 //---------------- |
|
611 |
|
612 BOOL SearchPngList ( |
|
613 TCHAR *pFileList, int FileCount, int *pFileIndex, |
|
614 PTSTR pstrPrevName, PTSTR pstrNextName) |
|
615 { |
|
616 if (FileCount > 0) |
|
617 { |
|
618 // get previous entry |
|
619 |
|
620 if (pstrPrevName != NULL) |
|
621 { |
|
622 if (*pFileIndex > 0) |
|
623 *pFileIndex -= 1; |
|
624 else |
|
625 *pFileIndex = FileCount - 1; |
|
626 |
|
627 strcpy (pstrPrevName, pFileList + (*pFileIndex * MAX_PATH)); |
|
628 } |
|
629 |
|
630 // get next entry |
|
631 |
|
632 if (pstrNextName != NULL) |
|
633 { |
|
634 if (*pFileIndex < FileCount - 1) |
|
635 *pFileIndex += 1; |
|
636 else |
|
637 *pFileIndex = 0; |
|
638 |
|
639 strcpy (pstrNextName, pFileList + (*pFileIndex * MAX_PATH)); |
|
640 } |
|
641 |
|
642 return TRUE; |
|
643 } |
|
644 else |
|
645 { |
|
646 return FALSE; |
|
647 } |
|
648 } |
|
649 |
|
650 //----------------- |
|
651 // LoadImageFile |
|
652 //----------------- |
|
653 |
|
654 BOOL LoadImageFile (HWND hwnd, PTSTR pstrPathName, |
|
655 png_byte **ppbImage, int *pxImgSize, int *pyImgSize, |
|
656 int *piChannels, png_color *pBkgColor) |
|
657 { |
|
658 static TCHAR szTmp [MAX_PATH]; |
|
659 |
|
660 // if there's an existing PNG, free the memory |
|
661 |
|
662 if (*ppbImage) |
|
663 { |
|
664 free (*ppbImage); |
|
665 *ppbImage = NULL; |
|
666 } |
|
667 |
|
668 // Load the entire PNG into memory |
|
669 |
|
670 SetCursor (LoadCursor (NULL, IDC_WAIT)); |
|
671 ShowCursor (TRUE); |
|
672 |
|
673 PngLoadImage (pstrPathName, ppbImage, pxImgSize, pyImgSize, piChannels, |
|
674 pBkgColor); |
|
675 |
|
676 ShowCursor (FALSE); |
|
677 SetCursor (LoadCursor (NULL, IDC_ARROW)); |
|
678 |
|
679 if (*ppbImage != NULL) |
|
680 { |
|
681 sprintf (szTmp, "VisualPng - %s", strrchr(pstrPathName, '\\') + 1); |
|
682 SetWindowText (hwnd, szTmp); |
|
683 } |
|
684 else |
|
685 { |
|
686 MessageBox (hwnd, TEXT ("Error in loading the PNG image"), |
|
687 szProgName, MB_ICONEXCLAMATION | MB_OK); |
|
688 return FALSE; |
|
689 } |
|
690 |
|
691 return TRUE; |
|
692 } |
|
693 |
|
694 //---------------- |
|
695 // DisplayImage |
|
696 //---------------- |
|
697 |
|
698 BOOL DisplayImage (HWND hwnd, BYTE **ppDib, |
|
699 BYTE **ppDiData, int cxWinSize, int cyWinSize, |
|
700 BYTE *pbImage, int cxImgSize, int cyImgSize, int cImgChannels, |
|
701 BOOL bStretched) |
|
702 { |
|
703 BYTE *pDib = *ppDib; |
|
704 BYTE *pDiData = *ppDiData; |
|
705 // BITMAPFILEHEADER *pbmfh; |
|
706 BITMAPINFOHEADER *pbmih; |
|
707 WORD wDIRowBytes; |
|
708 png_color bkgBlack = {0, 0, 0}; |
|
709 png_color bkgGray = {127, 127, 127}; |
|
710 png_color bkgWhite = {255, 255, 255}; |
|
711 |
|
712 // allocate memory for the Device Independant bitmap |
|
713 |
|
714 wDIRowBytes = (WORD) ((3 * cxWinSize + 3L) >> 2) << 2; |
|
715 |
|
716 if (pDib) |
|
717 { |
|
718 free (pDib); |
|
719 pDib = NULL; |
|
720 } |
|
721 |
|
722 if (!(pDib = (BYTE *) malloc (sizeof(BITMAPINFOHEADER) + |
|
723 wDIRowBytes * cyWinSize))) |
|
724 { |
|
725 MessageBox (hwnd, TEXT ("Error in displaying the PNG image"), |
|
726 szProgName, MB_ICONEXCLAMATION | MB_OK); |
|
727 *ppDib = pDib = NULL; |
|
728 return FALSE; |
|
729 } |
|
730 *ppDib = pDib; |
|
731 memset (pDib, 0, sizeof(BITMAPINFOHEADER)); |
|
732 |
|
733 // initialize the dib-structure |
|
734 |
|
735 pbmih = (BITMAPINFOHEADER *) pDib; |
|
736 pbmih->biSize = sizeof(BITMAPINFOHEADER); |
|
737 pbmih->biWidth = cxWinSize; |
|
738 pbmih->biHeight = -((long) cyWinSize); |
|
739 pbmih->biPlanes = 1; |
|
740 pbmih->biBitCount = 24; |
|
741 pbmih->biCompression = 0; |
|
742 pDiData = pDib + sizeof(BITMAPINFOHEADER); |
|
743 *ppDiData = pDiData; |
|
744 |
|
745 // first fill bitmap with gray and image border |
|
746 |
|
747 InitBitmap (pDiData, cxWinSize, cyWinSize); |
|
748 |
|
749 // then fill bitmap with image |
|
750 |
|
751 if (pbImage) |
|
752 { |
|
753 FillBitmap ( |
|
754 pDiData, cxWinSize, cyWinSize, |
|
755 pbImage, cxImgSize, cyImgSize, cImgChannels, |
|
756 bStretched); |
|
757 } |
|
758 |
|
759 return TRUE; |
|
760 } |
|
761 |
|
762 //-------------- |
|
763 // InitBitmap |
|
764 //-------------- |
|
765 |
|
766 BOOL InitBitmap (BYTE *pDiData, int cxWinSize, int cyWinSize) |
|
767 { |
|
768 BYTE *dst; |
|
769 int x, y, col; |
|
770 |
|
771 // initialize the background with gray |
|
772 |
|
773 dst = pDiData; |
|
774 for (y = 0; y < cyWinSize; y++) |
|
775 { |
|
776 col = 0; |
|
777 for (x = 0; x < cxWinSize; x++) |
|
778 { |
|
779 // fill with GRAY |
|
780 *dst++ = 127; |
|
781 *dst++ = 127; |
|
782 *dst++ = 127; |
|
783 col += 3; |
|
784 } |
|
785 // rows start on 4 byte boundaries |
|
786 while ((col % 4) != 0) |
|
787 { |
|
788 dst++; |
|
789 col++; |
|
790 } |
|
791 } |
|
792 |
|
793 return TRUE; |
|
794 } |
|
795 |
|
796 //-------------- |
|
797 // FillBitmap |
|
798 //-------------- |
|
799 |
|
800 BOOL FillBitmap ( |
|
801 BYTE *pDiData, int cxWinSize, int cyWinSize, |
|
802 BYTE *pbImage, int cxImgSize, int cyImgSize, int cImgChannels, |
|
803 BOOL bStretched) |
|
804 { |
|
805 BYTE *pStretchedImage; |
|
806 BYTE *pImg; |
|
807 BYTE *src, *dst; |
|
808 BYTE r, g, b, a; |
|
809 const int cDIChannels = 3; |
|
810 WORD wImgRowBytes; |
|
811 WORD wDIRowBytes; |
|
812 int cxNewSize, cyNewSize; |
|
813 int cxImgPos, cyImgPos; |
|
814 int xImg, yImg; |
|
815 int xWin, yWin; |
|
816 int xOld, yOld; |
|
817 int xNew, yNew; |
|
818 |
|
819 if (bStretched) |
|
820 { |
|
821 cxNewSize = cxWinSize - 2 * MARGIN; |
|
822 cyNewSize = cyWinSize - 2 * MARGIN; |
|
823 |
|
824 // stretch the image to it's window determined size |
|
825 |
|
826 // the following two are the same, but the first has side-effects |
|
827 // because of rounding |
|
828 // if ((cyNewSize / cxNewSize) > (cyImgSize / cxImgSize)) |
|
829 if ((cyNewSize * cxImgSize) > (cyImgSize * cxNewSize)) |
|
830 { |
|
831 cyNewSize = cxNewSize * cyImgSize / cxImgSize; |
|
832 cxImgPos = MARGIN; |
|
833 cyImgPos = (cyWinSize - cyNewSize) / 2; |
|
834 } |
|
835 else |
|
836 { |
|
837 cxNewSize = cyNewSize * cxImgSize / cyImgSize; |
|
838 cyImgPos = MARGIN; |
|
839 cxImgPos = (cxWinSize - cxNewSize) / 2; |
|
840 } |
|
841 |
|
842 pStretchedImage = malloc (cImgChannels * cxNewSize * cyNewSize); |
|
843 pImg = pStretchedImage; |
|
844 |
|
845 for (yNew = 0; yNew < cyNewSize; yNew++) |
|
846 { |
|
847 yOld = yNew * cyImgSize / cyNewSize; |
|
848 for (xNew = 0; xNew < cxNewSize; xNew++) |
|
849 { |
|
850 xOld = xNew * cxImgSize / cxNewSize; |
|
851 |
|
852 r = *(pbImage + cImgChannels * ((yOld * cxImgSize) + xOld) + 0); |
|
853 g = *(pbImage + cImgChannels * ((yOld * cxImgSize) + xOld) + 1); |
|
854 b = *(pbImage + cImgChannels * ((yOld * cxImgSize) + xOld) + 2); |
|
855 *pImg++ = r; |
|
856 *pImg++ = g; |
|
857 *pImg++ = b; |
|
858 if (cImgChannels == 4) |
|
859 { |
|
860 a = *(pbImage + cImgChannels * ((yOld * cxImgSize) + xOld) |
|
861 + 3); |
|
862 *pImg++ = a; |
|
863 } |
|
864 } |
|
865 } |
|
866 |
|
867 // calculate row-bytes |
|
868 |
|
869 wImgRowBytes = cImgChannels * cxNewSize; |
|
870 wDIRowBytes = (WORD) ((cDIChannels * cxWinSize + 3L) >> 2) << 2; |
|
871 |
|
872 // copy image to screen |
|
873 |
|
874 for (yImg = 0, yWin = cyImgPos; yImg < cyNewSize; yImg++, yWin++) |
|
875 { |
|
876 if (yWin >= cyWinSize - cyImgPos) |
|
877 break; |
|
878 src = pStretchedImage + yImg * wImgRowBytes; |
|
879 dst = pDiData + yWin * wDIRowBytes + cxImgPos * cDIChannels; |
|
880 |
|
881 for (xImg = 0, xWin = cxImgPos; xImg < cxNewSize; xImg++, xWin++) |
|
882 { |
|
883 if (xWin >= cxWinSize - cxImgPos) |
|
884 break; |
|
885 r = *src++; |
|
886 g = *src++; |
|
887 b = *src++; |
|
888 *dst++ = b; /* note the reverse order */ |
|
889 *dst++ = g; |
|
890 *dst++ = r; |
|
891 if (cImgChannels == 4) |
|
892 { |
|
893 a = *src++; |
|
894 } |
|
895 } |
|
896 } |
|
897 |
|
898 // free memory |
|
899 |
|
900 if (pStretchedImage != NULL) |
|
901 { |
|
902 free (pStretchedImage); |
|
903 pStretchedImage = NULL; |
|
904 } |
|
905 |
|
906 } |
|
907 |
|
908 // process the image not-stretched |
|
909 |
|
910 else |
|
911 { |
|
912 // calculate the central position |
|
913 |
|
914 cxImgPos = (cxWinSize - cxImgSize) / 2; |
|
915 cyImgPos = (cyWinSize - cyImgSize) / 2; |
|
916 |
|
917 // check for image larger than window |
|
918 |
|
919 if (cxImgPos < MARGIN) |
|
920 cxImgPos = MARGIN; |
|
921 if (cyImgPos < MARGIN) |
|
922 cyImgPos = MARGIN; |
|
923 |
|
924 // calculate both row-bytes |
|
925 |
|
926 wImgRowBytes = cImgChannels * cxImgSize; |
|
927 wDIRowBytes = (WORD) ((cDIChannels * cxWinSize + 3L) >> 2) << 2; |
|
928 |
|
929 // copy image to screen |
|
930 |
|
931 for (yImg = 0, yWin = cyImgPos; yImg < cyImgSize; yImg++, yWin++) |
|
932 { |
|
933 if (yWin >= cyWinSize - MARGIN) |
|
934 break; |
|
935 src = pbImage + yImg * wImgRowBytes; |
|
936 dst = pDiData + yWin * wDIRowBytes + cxImgPos * cDIChannels; |
|
937 |
|
938 for (xImg = 0, xWin = cxImgPos; xImg < cxImgSize; xImg++, xWin++) |
|
939 { |
|
940 if (xWin >= cxWinSize - MARGIN) |
|
941 break; |
|
942 r = *src++; |
|
943 g = *src++; |
|
944 b = *src++; |
|
945 *dst++ = b; /* note the reverse order */ |
|
946 *dst++ = g; |
|
947 *dst++ = r; |
|
948 if (cImgChannels == 4) |
|
949 { |
|
950 a = *src++; |
|
951 } |
|
952 } |
|
953 } |
|
954 } |
|
955 |
|
956 return TRUE; |
|
957 } |
|
958 |
|
959 //----------------- |
|
960 // end of source |
|
961 //----------------- |