nethack-gwaa-kiwi/nethack
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win32_gui: implement background glyph rendering

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try to use system TrasnparentBlt (or not)
This commit is contained in:
Alex Kompel
2015-06-09 08:34:11 -07:00
parent 2601583121
commit afa0e95e66
7 changed files with 153 additions and 107 deletions
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win/win32/winhack.c
+102 -2
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@@ -1,5 +1,5 @@
/* NetHack 3.6 winhack.c $NHDT-Date: 1432512811 2015/05/25 00:13:31 $ $NHDT-Branch: master $:$NHDT-Revision: 1.40 $ */
/* Copyright (C) 2001 by Alex Kompel */
/* NetHack 3.6 winhack.c $NHDT-Date: 1432512811 2015/05/25 00:13:31 $ $NHDT-Branch: master $:$NHDT-Revision: 1.40 $ */
/* Copyright (C) 2001 by Alex Kompel */
/* NetHack may be freely redistributed. See license for details. */
// winhack.cpp : Defines the entry point for the application.
@@ -50,6 +50,10 @@ Version _WIN_32IE Platform/IE
extern void FDECL(nethack_exit, (int));
static TCHAR *_get_cmd_arg(TCHAR *pCmdLine);
static HRESULT GetComCtlVersion(LPDWORD pdwMajor, LPDWORD pdwMinor);
BOOL WINAPI
_nhapply_image_transparent(HDC hDC, int x, int y, int width, int height,
HDC sourceDC, int s_x, int s_y, int s_width,
int s_height, UINT cTransparent);
// Global Variables:
NHWinApp _nethack_app;
@@ -78,6 +82,7 @@ WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine,
char buf[BUFSZ];
DWORD major, minor;
boolean resuming;
/* OSVERSIONINFO osvi; */
UNREFERENCED_PARAMETER(hPrevInstance);
UNREFERENCED_PARAMETER(lpCmdLine);
@@ -121,6 +126,17 @@ WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine,
_nethack_app.bNoSounds = FALSE;
#if 0 /* GdiTransparentBlt does not render spash bitmap for whatever reason */
/* use system-provided TransparentBlt for Win2k+ */
ZeroMemory(&osvi, sizeof(OSVERSIONINFO));
osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
GetVersionEx(&osvi);
if (osvi.dwMajorVersion >= 5)
_nethack_app.lpfnTransparentBlt = GdiTransparentBlt;
else
#endif
_nethack_app.lpfnTransparentBlt = _nhapply_image_transparent;
// init controls
if (FAILED(GetComCtlVersion(&major, &minor))) {
char buf[TBUFSZ];
@@ -287,3 +303,87 @@ GetComCtlVersion(LPDWORD pdwMajor, LPDWORD pdwMinor)
FreeLibrary(hComCtl);
return hr;
}
/* apply bitmap pointed by sourceDc transparently over
bitmap pointed by hDC */
BOOL WINAPI
_nhapply_image_transparent(HDC hDC, int x, int y, int width, int height,
HDC sourceDC, int s_x, int s_y, int s_width,
int s_height, UINT cTransparent)
{
/* Don't use TransparentBlt; According to Microsoft, it contains a memory
* leak in Window 95/98. */
HDC hdcMem, hdcBack, hdcObject, hdcSave;
COLORREF cColor;
HBITMAP bmAndBack, bmAndObject, bmAndMem, bmSave;
HBITMAP bmBackOld, bmObjectOld, bmMemOld, bmSaveOld;
/* Create some DCs to hold temporary data. */
hdcBack = CreateCompatibleDC(hDC);
hdcObject = CreateCompatibleDC(hDC);
hdcMem = CreateCompatibleDC(hDC);
hdcSave = CreateCompatibleDC(hDC);
/* this is bitmap for our pet image */
bmSave = CreateCompatibleBitmap(hDC, width, height);
/* Monochrome DC */
bmAndBack = CreateBitmap(width, height, 1, 1, NULL);
bmAndObject = CreateBitmap(width, height, 1, 1, NULL);
/* resulting bitmap */
bmAndMem = CreateCompatibleBitmap(hDC, width, height);
/* Each DC must select a bitmap object to store pixel data. */
bmBackOld = SelectObject(hdcBack, bmAndBack);
bmObjectOld = SelectObject(hdcObject, bmAndObject);
bmMemOld = SelectObject(hdcMem, bmAndMem);
bmSaveOld = SelectObject(hdcSave, bmSave);
/* copy source image because it is going to be overwritten */
StretchBlt(hdcSave, 0, 0, width, height, sourceDC, s_x, s_y, s_width,
s_height, SRCCOPY);
/* Set the background color of the source DC to the color.
contained in the parts of the bitmap that should be transparent */
cColor = SetBkColor(hdcSave, cTransparent);
/* Create the object mask for the bitmap by performing a BitBlt
from the source bitmap to a monochrome bitmap. */
BitBlt(hdcObject, 0, 0, width, height, hdcSave, 0, 0, SRCCOPY);
/* Set the background color of the source DC back to the original
color. */
SetBkColor(hdcSave, cColor);
/* Create the inverse of the object mask. */
BitBlt(hdcBack, 0, 0, width, height, hdcObject, 0, 0, NOTSRCCOPY);
/* Copy background to the resulting image */
BitBlt(hdcMem, 0, 0, width, height, hDC, x, y, SRCCOPY);
/* Mask out the places where the source image will be placed. */
BitBlt(hdcMem, 0, 0, width, height, hdcObject, 0, 0, SRCAND);
/* Mask out the transparent colored pixels on the source image. */
BitBlt(hdcSave, 0, 0, width, height, hdcBack, 0, 0, SRCAND);
/* XOR the source image with the beckground. */
BitBlt(hdcMem, 0, 0, width, height, hdcSave, 0, 0, SRCPAINT);
/* blt resulting image to the screen */
BitBlt(hDC, x, y, width, height, hdcMem, 0, 0, SRCCOPY);
/* cleanup */
DeleteObject(SelectObject(hdcBack, bmBackOld));
DeleteObject(SelectObject(hdcObject, bmObjectOld));
DeleteObject(SelectObject(hdcMem, bmMemOld));
DeleteObject(SelectObject(hdcSave, bmSaveOld));
DeleteDC(hdcMem);
DeleteDC(hdcBack);
DeleteDC(hdcObject);
DeleteDC(hdcSave);
return TRUE;
}