Mercurial > sdl-ios-xcode
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Date: Tue, 15 Feb 2005 21:28:48 +0900 (JST)
From: "Michael Leonhard"
Subject: [SDL] resize bug on Win32 and patch
This is my first post to this mailing list. In this email I will detail a
bug in the behavior of resizable SDL windows on Win32. Then I will
explain the solution and provide a patch.
Symptoms:
Under Windows, an SDL display created with the SDL_RESIZABLE flag exhibits
quirky behavior when being maximized. The window is resized to the proper
size, but it is shifted upwards about half the height of the title bar.
Similarly, a window whose origin is above the top of the screen will
spontaneously move its upper-left origin upon being resized. After two
such resize-induced moves, the title bar will be entirely off the top edge
of the screen. Subsequently, when the mouse is clicked and released on
the window border, the window will shrink its height spontaneously. This
height shrinkage occurs even if the user did not resize the border.
To observe this curious situation, please invoke:
SDL-1.2.8/test/testwm.exe -resize
Cause:
A pair of integers, SDL_windowX and SDL_windowY, are defined in
video/wincommon/SDL_sysevents.c. They are used by the DirectX video
driver and the DIB video driver:
video/windx5/SDL_dx5video.c
video/windib/SDL_dibvideo.c
As I understand the source code, the primary use of these variables is to
create a rectangle that represents the surface area in CLIENT SPACE.
Client space refers to a coordinate system that originates at the upper
left corner of a Win32 Window's drawable area. This is just inside the
window border and title bar. This client space rectangle, called bounds,
is subsequently converted to screen space with a call to
AdjustWindowRectEx. The problem is found in SDL's handling of the
WM_WINDOWPOSCHANGED message. According to MSDN,
"The WM_WINDOWPOSCHANGED message is sent to a window whose
size, position, or place in the Z order has changed as a
result of a call to the SetWindowPos function or another
window-management function."
I have confirmed that this message is indeed being sent to the SDL window
when the mouse is clicked on the window border, even if the window border
is not dragged.
In video/wincommon/SDL_sysevents.c, on line 464, in response to the
WM_WINDOWPOSCHANGED message, the (potentially) new client rectangle is
obtained. This rectangle is translated into screen coordinates and THEN
assigned to the SDL_windowX and Y variables. Thus screen coordinates are
being assigned to client coordinate variables. Once this is understood,
the solution is apparent: assign SDL_windowX and Y before translating the
rectangle to screen coordinates. This is accomplished by the following
patch.
-Mike_L
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 29 Jan 2006 08:50:06 +0000 |
| parents | e044e7c70a50 |
| children | e05bc5d315e3 |
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# The top-level input Makefile for SDL # require automake 1.4 AUTOMAKE_OPTIONS = 1.4 ## Any directories that you want built and installed should go here. SUBDIRS = src include docs ## Any directories you want a part of the distribution should be listed ## here, as well as have a Makefile generated at the end of configure.in ## ## This only works for subdirectories one level deep. DIST_SUBDIRS = $(SUBDIRS) # SDL runtime configuration script bin_SCRIPTS = sdl-config # All the rest of the distributed files EXTRA_DIST = \ BUGS \ TODO \ COPYING \ CREDITS \ INSTALL \ README \ README.AmigaOS \ README.CVS \ README.DC \ README.Epoc \ README.MacOS \ README.MacOSX \ README.MiNT \ README.NanoX \ README.PicoGUI \ README.QNX \ README.Qtopia \ README.WinCE \ README-SDL.txt \ Borland.html \ Borland.zip \ VisualC.html \ VisualC.zip \ VisualCE.zip \ Makefile.dc \ MPWmake.sea.bin \ CWprojects.sea.bin \ PBProjects.tar.gz \ EpocBuildFiles.zip \ Xcode.tar.gz \ Xcode21.tar.gz \ WhatsNew \ docs.html \ sdl.m4 \ SDL.spec \ autogen.sh \ strip_fPIC.sh # M4 macro file for inclusion with autoconf m4datadir = $(datadir)/aclocal m4data_DATA = sdl.m4 # Rule to build tar-gzipped distribution package $(PACKAGE)-$(VERSION).tar.gz: dist # Rule to build RPM distribution package rpm: $(PACKAGE)-$(VERSION).tar.gz rpm -ta $(PACKAGE)-$(VERSION).tar.gz # Rule to rebuild the export lists for BeOS, MacOS and Win32. exports: (cd src/main/beos/exports; $(MAKE)) (cd src/main/macos/exports; $(MAKE)) (cd src/main/macosx/exports; $(MAKE)) (cd src/main/win32/exports; $(MAKE)) # Rule to build the Project Builder archive in MacOS X PBProjects.tar.gz: rm -f `find . -name .DS_Store` if [ -d PBProjects ]; then \ tar zcvf $@ PBProjects; \ fi # Rule to install the libraries only - prevent rebuilding apps install-lib: cd src && $(MAKE) install-libLTLIBRARIES # Run ldconfig after installing the library: install-hook: -ldconfig # Grab the test programs for the distribution: dist-hook: if test -f test/Makefile; then (cd test; make distclean); fi rm -rf $(srcdir)/test/autom4te* cp -rp $(srcdir)/test $(distdir) rm -rf `find $(distdir) -type d -name CVS -print` # Create a CVS snapshot that people can run update -d on CVSROOT = :pserver:guest@libsdl.org:/home/sdlweb/libsdl.org/cvs snapshot: cvs -d $(CVSROOT) login cvs -d $(CVSROOT) checkout SDL12 (cd SDL12 && ./autogen.sh && rm -rf autom4te.cache) mv SDL12 SDL-1.2 tar zcvf $(HOME)/SDL-1.2.tar.gz SDL-1.2 rm -rf SDL-1.2 snapshot13: cvs -d $(CVSROOT) login cvs -d $(CVSROOT) checkout -r branch_1_3_x SDL12 (cd SDL12 && ./autogen.sh && rm -rf autom4te.cache) mv SDL12 SDL-1.3 tar zcvf $(HOME)/SDL-1.3.tar.gz SDL-1.3 rm -rf SDL-1.3