ref: e447c9fb929e61a40203b0193ee8d4cab8d72f7e
dir: /DoConfig/fltk/src/fl_font_win32.cxx/
//
// "$Id$"
//
// WIN32 font selection routines for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2016 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// http://www.fltk.org/COPYING.php
//
// Please report all bugs and problems on the following page:
//
// http://www.fltk.org/str.php
//
#include <FL/Fl_Printer.H>
static int fl_angle_ = 0;
#ifndef FL_DOXYGEN
Fl_Font_Descriptor::Fl_Font_Descriptor(const char* name, Fl_Fontsize fsize) {
int weight = FW_NORMAL;
int italic = 0;
switch (*name++) {
case 'I': italic = 1; break;
case 'P': italic = 1;
case 'B': weight = FW_BOLD; break;
case ' ': break;
default: name--;
}
fid = CreateFont(
-fsize, // negative makes it use "char size"
0, // logical average character width
fl_angle_*10, // angle of escapement
fl_angle_*10, // base-line orientation angle
weight,
italic,
FALSE, // underline attribute flag
FALSE, // strikeout attribute flag
DEFAULT_CHARSET, // character set identifier
OUT_DEFAULT_PRECIS, // output precision
CLIP_DEFAULT_PRECIS,// clipping precision
DEFAULT_QUALITY, // output quality
DEFAULT_PITCH, // pitch and family
name // pointer to typeface name string
);
angle = fl_angle_;
if (!fl_gc) fl_GetDC(0);
SelectObject(fl_gc, fid);
GetTextMetrics(fl_gc, &metr);
// BOOL ret = GetCharWidthFloat(fl_gc, metr.tmFirstChar, metr.tmLastChar, font->width+metr.tmFirstChar);
// ...would be the right call, but is not implemented into Window95! (WinNT?)
//GetCharWidth(fl_gc, 0, 255, width);
int i;
memset(width, 0, 64 * sizeof(int*));
#if HAVE_GL
listbase = 0;
for (i = 0; i < 64; i++) glok[i] = 0;
#endif
size = fsize;
}
Fl_Font_Descriptor::~Fl_Font_Descriptor() {
#if HAVE_GL
// Delete list created by gl_draw(). This is not done by this code
// as it will link in GL unnecessarily. There should be some kind
// of "free" routine pointer, or a subclass?
// if (listbase) {
// int base = font->min_char_or_byte2;
// int size = font->max_char_or_byte2-base+1;
// int base = 0; int size = 256;
// glDeleteLists(listbase+base,size);
// }
#endif
if (this == fl_graphics_driver->font_descriptor()) fl_graphics_driver->font_descriptor(NULL);
DeleteObject(fid);
for (int i = 0; i < 64; i++) {
if ( width[i] ) free(width[i]);
}
}
////////////////////////////////////////////////////////////////
// WARNING: if you add to this table, you must redefine FL_FREE_FONT
// in Enumerations.H & recompile!!
static Fl_Fontdesc built_in_table[] = {
{" Arial"},
{"BArial"},
{"IArial"},
{"PArial"},
{" Courier New"},
{"BCourier New"},
{"ICourier New"},
{"PCourier New"},
{" Times New Roman"},
{"BTimes New Roman"},
{"ITimes New Roman"},
{"PTimes New Roman"},
{" Symbol"},
{" Terminal"},
{"BTerminal"},
{" Wingdings"},
};
Fl_Fontdesc* fl_fonts = built_in_table;
static Fl_Font_Descriptor* find(Fl_Font fnum, Fl_Fontsize size, int angle) {
Fl_Fontdesc* s = fl_fonts+fnum;
if (!s->name) s = fl_fonts; // use 0 if fnum undefined
Fl_Font_Descriptor* f;
for (f = s->first; f; f = f->next)
if (f->size == size && f->angle == angle) return f;
f = new Fl_Font_Descriptor(s->name, size);
f->next = s->first;
s->first = f;
return f;
}
////////////////////////////////////////////////////////////////
// Public interface:
static void fl_font(Fl_Graphics_Driver *driver, Fl_Font fnum, Fl_Fontsize size, int angle) {
if (fnum==-1) { // just make sure that we will load a new font next time
fl_angle_ = 0;
driver->Fl_Graphics_Driver::font(0, 0);
return;
}
if (fnum == driver->Fl_Graphics_Driver::font() && size == driver->size() && angle == fl_angle_) return;
fl_angle_ = angle;
driver->Fl_Graphics_Driver::font(fnum, size);
driver->font_descriptor( find(fnum, size, angle) );
}
void Fl_GDI_Graphics_Driver::font(Fl_Font fnum, Fl_Fontsize size) {
fl_font(this, fnum, size, 0);
}
int Fl_GDI_Graphics_Driver::height() {
Fl_Font_Descriptor *fl_fontsize = font_descriptor();
if (fl_fontsize) return (fl_fontsize->metr.tmAscent + fl_fontsize->metr.tmDescent);
else return -1;
}
int Fl_GDI_Graphics_Driver::descent() {
Fl_Font_Descriptor *fl_fontsize = font_descriptor();
if (fl_fontsize) return fl_fontsize->metr.tmDescent;
else return -1;
}
// Unicode string buffer
static unsigned short *wstr = NULL;
static int wstr_len = 0;
double Fl_GDI_Graphics_Driver::width(const char* c, int n) {
int i = 0;
if (!font_descriptor()) return -1.0;
double w = 0.0;
char *end = (char *)&c[n];
while (i < n) {
unsigned int ucs;
int l;
ucs = fl_utf8decode((const char*)(c + i), end, &l);
// if (l < 1) l = 1;
i += l;
if (!fl_nonspacing(ucs)) {
w += width(ucs);
}
}
return w;
}
double Fl_GDI_Graphics_Driver::width(unsigned int c) {
Fl_Font_Descriptor *fl_fontsize = font_descriptor();
unsigned int r;
SIZE s;
// Special Case Handling of Unicode points over U+FFFF.
// The logic (below) computes a lookup table for char widths
// on-the-fly, but the table only covers codepoints up to
// U+FFFF, which covers the basic multilingual plane, but
// not any higher plane, or glyphs that require surrogate-pairs
// to encode them in WinXX, which is UTF16.
// This code assumes that these glyphs are rarely used and simply
// measures them explicitly if they occur - This will be slow...
if(c > 0x0000FFFF) { // UTF16 surrogate pair is needed
if (!fl_gc) { // We have no valid gc, so nothing to measure - bail out
return 0.0;
}
int cc; // cell count
unsigned short u16[4]; // Array for UTF16 representation of c
// Creates a UTF16 string from a UCS code point.
cc = fl_ucs_to_Utf16(c, u16, 4);
// Make sure the current font is selected before we make the measurement
SelectObject(fl_gc, fl_fontsize->fid);
// measure the glyph width
GetTextExtentPoint32W(fl_gc, (WCHAR*)u16, cc, &s);
return (double)s.cx;
}
// else - this falls through to the lookup-table for glyph widths
// in the basic multilingual plane
r = (c & 0xFC00) >> 10;
if (!fl_fontsize->width[r]) {
fl_fontsize->width[r] = (int*) malloc(sizeof(int) * 0x0400);
for (int i = 0; i < 0x0400; i++) fl_fontsize->width[r][i] = -1;
} else {
if ( fl_fontsize->width[r][c&0x03FF] >= 0 ) { // already cached
return (double) fl_fontsize->width[r][c & 0x03FF];
}
}
unsigned short ii = r * 0x400;
// The following code makes a best effort attempt to obtain a valid fl_gc.
// If no fl_gc is available at the time we call fl_width(), then we first
// try to obtain a gc from the first fltk window.
// If that is null then we attempt to obtain the gc from the current screen
// using (GetDC(NULL)).
// This should resolve STR #2086
HDC gc = fl_gc;
HWND hWnd = 0;
if (!gc) { // We have no valid gc, try and obtain one
// Use our first fltk window, or fallback to using the screen via GetDC(NULL)
hWnd = Fl::first_window() ? fl_xid(Fl::first_window()) : NULL;
gc = GetDC(hWnd);
}
if (!gc) Fl::fatal("Invalid graphic context: fl_width() failed because no valid HDC was found!");
SelectObject(gc, fl_fontsize->fid);
ii += c &0x03FF;
GetTextExtentPoint32W(gc, (WCHAR*)&ii, 1, &s);
fl_fontsize->width[r][c&0x03FF] = s.cx;
if (gc && gc!=fl_gc) ReleaseDC(hWnd, gc);
return (double) fl_fontsize->width[r][c & 0x03FF];
}
/* 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 void on_printer_extents_update(int &dx, int &dy, int &w, int &h)
// converts text extents from device coords to logical coords
{
POINT pt[3] = { {0, 0}, {dx, dy}, {dx+w, dy+h} };
DPtoLP(fl_gc, pt, 3);
w = pt[2].x - pt[1].x;
h = pt[2].y - pt[1].y;
dx = pt[1].x - pt[0].x;
dy = pt[1].y - pt[0].y;
}
// if printer context, extents shd be converted to logical coords
#define EXTENTS_UPDATE(x,y,w,h) \
if (Fl_Surface_Device::surface() != Fl_Display_Device::display_device()) { on_printer_extents_update(x,y,w,h); }
// Function to determine the extent of the "inked" area of the glyphs in a string
void Fl_GDI_Graphics_Driver::text_extents(const char *c, int n, int &dx, int &dy, int &w, int &h) {
Fl_Font_Descriptor *fl_fontsize = font_descriptor();
if (!fl_fontsize) { // no valid font, nothing to measure
w = 0; h = 0;
dx = dy = 0;
return;
}
static unsigned short *ext_buff = NULL; // UTF-16 converted version of input UTF-8 string
static WORD *w_buff = NULL; // glyph indices array
static unsigned wc_len = 0; // current string buffer dimensions
static const MAT2 matrix = { { 0, 1 }, { 0, 0 }, { 0, 0 }, { 0, 1 } }; // identity mat for GetGlyphOutlineW
GLYPHMETRICS metrics;
int maxw = 0, maxh = 0, dh;
int minx = 0, miny = -999999;
unsigned len = 0, idx = 0;
HWND hWnd = 0;
HDC gc = fl_gc; // local copy of current gc - make a copy in case we change it...
int has_surrogates; // will be set if the string contains surrogate pairs
// 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
// The following code makes a best effort attempt to obtain a valid fl_gc.
// See description in fl_width() above for an explanation.
if (!gc) { // We have no valid gc, try and obtain one
// Use our first fltk window, or fallback to using the screen via GetDC(NULL)
hWnd = Fl::first_window() ? fl_xid(Fl::first_window()) : NULL;
gc = GetDC(hWnd);
}
if (!gc) goto exit_error; // no valid gc, attempt to use fallback measure
// now convert the string to WCHAR and measure it
len = fl_utf8toUtf16(c, n, ext_buff, wc_len);
if(len >= wc_len) {
if(ext_buff) {delete [] ext_buff;}
if(w_buff) {delete [] w_buff;}
wc_len = len + 64;
ext_buff = new unsigned short[wc_len];
w_buff = new WORD[wc_len];
len = fl_utf8toUtf16(c, n, ext_buff, wc_len);
}
SelectObject(gc, fl_fontsize->fid);
// Are there surrogate-pairs in this string? If so GetGlyphIndicesW will fail
// since it can only handle the BMP range.
// We ideally want to use GetGlyphIndicesW, as it is the Right Thing, but it
// only works for the BMP, so we leverage GetCharacterPlacementW instead, which
// is not ideal, but works adequately well, and does handle surrogate pairs.
has_surrogates = 0;
for(unsigned ll = 0; ll < len; ll++) {
if((ext_buff[ll] >= 0xD800) && (ext_buff[ll] < 0xE000)) {
has_surrogates = -1;
break;
}
}
if (has_surrogates) {
// GetGlyphIndices will not work - use GetCharacterPlacementW() instead
GCP_RESULTSW gcp_res;
memset(w_buff, 0, (sizeof(WORD) * wc_len));
memset(&gcp_res, 0, sizeof(GCP_RESULTSW));
gcp_res.lpGlyphs = (LPWSTR)w_buff;
gcp_res.nGlyphs = wc_len;
gcp_res.lStructSize = sizeof(gcp_res);
DWORD dr = GetCharacterPlacementW(gc, (WCHAR*)ext_buff, len, 0, &gcp_res, GCP_GLYPHSHAPE);
if(dr) {
len = gcp_res.nGlyphs;
} else goto exit_error;
} else {
if (fl_GetGlyphIndices(gc, (WCHAR*)ext_buff, len, w_buff, GGI_MARK_NONEXISTING_GLYPHS) == GDI_ERROR) {
// some error occured here - just return fl_measure values
goto exit_error;
}
}
// now we have the glyph array we measure each glyph in turn...
for(idx = 0; idx < len; idx++){
if (GetGlyphOutlineW (gc, w_buff[idx], GGO_METRICS | GGO_GLYPH_INDEX,
&metrics, 0, NULL, &matrix) == GDI_ERROR) {
goto exit_error;
}
maxw += metrics.gmCellIncX;
if(idx == 0) minx = metrics.gmptGlyphOrigin.x;
dh = metrics.gmBlackBoxY - metrics.gmptGlyphOrigin.y;
if(dh > maxh) maxh = dh;
if(miny < metrics.gmptGlyphOrigin.y) miny = metrics.gmptGlyphOrigin.y;
}
// for the last cell, we only want the bounding X-extent, not the glyphs increment step
maxw = maxw - metrics.gmCellIncX + metrics.gmBlackBoxX + metrics.gmptGlyphOrigin.x;
w = maxw - minx;
h = maxh + miny;
dx = minx;
dy = -miny;
EXTENTS_UPDATE(dx, dy, w, h);
return; // normal exit
exit_error:
// some error here - just return fl_measure values
w = (int)width(c, n);
h = height();
dx = 0;
dy = descent() - h;
EXTENTS_UPDATE(dx, dy, w, h);
return;
} // fl_text_extents
void Fl_GDI_Graphics_Driver::draw(const char* str, int n, int x, int y) {
COLORREF oldColor = SetTextColor(fl_gc, fl_RGB());
// avoid crash if no font has been set yet
if (!font_descriptor()) this->font(FL_HELVETICA, FL_NORMAL_SIZE);
SelectObject(fl_gc, font_descriptor()->fid);
int wn = fl_utf8toUtf16(str, n, wstr, wstr_len);
if(wn >= wstr_len) {
wstr = (unsigned short*) realloc(wstr, sizeof(unsigned short) * (wn + 1));
wstr_len = wn + 1;
wn = fl_utf8toUtf16(str, n, wstr, wstr_len);
}
TextOutW(fl_gc, x, y, (WCHAR*)wstr, wn);
SetTextColor(fl_gc, oldColor); // restore initial state
}
void Fl_GDI_Graphics_Driver::draw(int angle, const char* str, int n, int x, int y) {
fl_font(this, Fl_Graphics_Driver::font(), size(), angle);
int wn = 0; // count of UTF16 cells to render full string
COLORREF oldColor = SetTextColor(fl_gc, fl_RGB());
SelectObject(fl_gc, font_descriptor()->fid);
wn = fl_utf8toUtf16(str, n, wstr, wstr_len);
if(wn >= wstr_len) { // Array too small
wstr = (unsigned short*) realloc(wstr, sizeof(unsigned short) * (wn + 1));
wstr_len = wn + 1;
wn = fl_utf8toUtf16(str, n, wstr, wstr_len); // respin the translation
}
TextOutW(fl_gc, x, y, (WCHAR*)wstr, wn);
SetTextColor(fl_gc, oldColor);
fl_font(this, Fl_Graphics_Driver::font(), size(), 0);
}
void Fl_GDI_Graphics_Driver::rtl_draw(const char* c, int n, int x, int y) {
int wn;
wn = fl_utf8toUtf16(c, n, wstr, wstr_len);
if(wn >= wstr_len) {
wstr = (unsigned short*) realloc(wstr, sizeof(unsigned short) * (wn + 1));
wstr_len = wn + 1;
wn = fl_utf8toUtf16(c, n, wstr, wstr_len);
}
COLORREF oldColor = SetTextColor(fl_gc, fl_RGB());
SelectObject(fl_gc, font_descriptor()->fid);
#ifdef RTL_CHAR_BY_CHAR
int i = 0;
int lx = 0;
while (i < wn) { // output char by char is very bad for Arabic but coherent with fl_width()
lx = (int) width(wstr[i]);
x -= lx;
TextOutW(fl_gc, x, y, (WCHAR*)wstr + i, 1);
if (fl_nonspacing(wstr[i])) {
x += lx;
}
i++;
}
#else
UINT old_align = SetTextAlign(fl_gc, TA_RIGHT | TA_RTLREADING);
TextOutW(fl_gc, x, y - height() + descent(), (WCHAR*)wstr, wn);
SetTextAlign(fl_gc, old_align);
#endif
SetTextColor(fl_gc, oldColor);
}
#endif
//
// End of "$Id$".
//