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STR #2076 redux: Make the Win32 variant only load GetGlyphIndicesW at runtime, so that the fl_text_extents code will still work on WinNT and other early systems. 

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@6534 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This commit is contained in:
Ian MacArthur 2008-12-01 21:01:58 +00:00
parent cfc5853ae7
commit 8d4bff7545
1 changed files with 31 additions and 2 deletions
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33
src/fl_font_win32.cxx
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@ -191,9 +191,30 @@ double fl_width(unsigned int c) {
return (double) fl_fontsize->width[r][c & 0x03FF];
}
static unsigned short *ext_buff = NULL; // UTF-16 converted string
/* Add function pointer to allow us to access GetGlyphIndicesW on systems that have it,
* without crashing on systems that do not. */
/* DWORD WINAPI GetGlyphIndicesW(HDC,LPCWSTR,int,LPWORD,DWORD) */
typedef DWORD (WINAPI* fl_GetGlyphIndices_func)(HDC,LPCWSTR,int,LPWORD,DWORD);
static fl_GetGlyphIndices_func fl_GetGlyphIndices = NULL; // used to hold a proc pointer for GetGlyphIndicesW
static int have_loaded_GetGlyphIndices = 0; // Set this non-zero once we have tried to load GetGlyphIndices
// Function that tries to dynamically load GetGlyphIndicesW at runtime
static void GetGlyphIndices_init() {
// Since not all versions of Windows include GetGlyphIndicesW support,
// we do a run-time check for the required function.
HMODULE hMod = GetModuleHandle("GDI32.DLL");
if (hMod) {
// check that GetGlyphIndicesW is available
fl_GetGlyphIndices = (fl_GetGlyphIndices_func)GetProcAddress(hMod, "GetGlyphIndicesW");
}
have_loaded_GetGlyphIndices = -1; // set this non-zero when we have attempted to load GetGlyphIndicesW
} // GetGlyphIndices_init function
static unsigned short *ext_buff = NULL; // UTF-16 converted version of input UTF-8 string
static unsigned wc_len = 0; // current string buffer dimension
static WORD *gi = NULL; // glyph indices array
// Function to determine the extent of the "inked" area of the glyphs in a string
void fl_text_extents(const char *c, int n, int &dx, int &dy, int &w, int &h) {
if (!fl_fontsize) {
w = 0; h = 0;
@ -204,6 +225,14 @@ void fl_text_extents(const char *c, int n, int &dx, int &dy, int &w, int &h) {
GLYPHMETRICS metrics;
int maxw = 0, maxh = 0, dh;
int minx = 0, miny = -999999;
// Have we loaded the GetGlyphIndicesW function yet?
if (have_loaded_GetGlyphIndices == 0) {
GetGlyphIndices_init();
}
// Do we have a usable GetGlyphIndices function?
if(!fl_GetGlyphIndices) goto exit_error; // No GetGlyphIndices function, use fallback mechanism instead
// now convert the string to WCHAR and measure it
unsigned len = fl_utf8toUtf16(c, n, ext_buff, wc_len);
if(len >= wc_len) {
@ -216,7 +245,7 @@ void fl_text_extents(const char *c, int n, int &dx, int &dy, int &w, int &h) {
}
SelectObject(fl_gc, fl_fontsize->fid);
if (GetGlyphIndicesW(fl_gc, (WCHAR*)ext_buff, len, gi, 0) == GDI_ERROR) {
if (fl_GetGlyphIndices(fl_gc, (WCHAR*)ext_buff, len, gi, 0) == GDI_ERROR) {
// some error occured here - just return fl_measure values?
goto exit_error;
}