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vdr/font.c
Klaus Schmidinger a9c7f0de90 Version 1.5.5 
- Fixed a name clash between skincurses.c and the new cOsd position functions.
- Updated the Finnish OSD texts (thanks to Rolf Ahrenberg).
- Changed the parameter "OSD font size" to "Default font size" in "Setup/OSD".
- Fixed handling address masks in SVDRP host settings (thanks to Frank Schmirler).
- Fonts can now be created with a width that overwrites the default width (thanks
  to Andreas Mair).
- Added full weekday names to i18n.c for plugins to use (thanks to Patrice Staudt).
  The new function WeekDayNameFull() can be used to get these names from integer
  values (just like the abbreviated weekday names).
- Fixed stripping i18n stuff from font names (reported by Anssi Hannula).
- Improved performance of the SVDRP commands LSTC and CHAN when used with a
  channel name.
2007-06-23 18:00:00 +02:00

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/*
* font.c: Font handling for the DVB On Screen Display
*
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: font.c 1.21 2007/06/23 11:25:42 kls Exp $
*/
#include "font.h"
#include <ctype.h>
#include <fontconfig/fontconfig.h>
#include <ft2build.h>
#include FT_FREETYPE_H
#include "config.h"
#include "osd.h"
#include "tools.h"
const char *DefaultFontOsd = "Sans Serif:Bold";
const char *DefaultFontSml = "Sans Serif";
const char *DefaultFontFix = "Courier:Bold";
// --- cFreetypeFont ---------------------------------------------------------
#define KERNING_UNKNOWN (-10000)
struct tKerning {
uint prevSym;
int kerning;
tKerning(uint PrevSym, int Kerning = 0) { prevSym = PrevSym; kerning = Kerning; }
};
class cGlyph : public cListObject {
private:
uint charCode;
uchar *bitmap;
int advanceX;
int advanceY;
int left; ///< The bitmap's left bearing expressed in integer pixels.
int top; ///< The bitmap's top bearing expressed in integer pixels.
int width; ///< The number of pixels per bitmap row.
int rows; ///< The number of bitmap rows.
int pitch; ///< The pitch's absolute value is the number of bytes taken by one bitmap row, including padding.
cVector<tKerning> kerningCache;
public:
cGlyph(uint CharCode, FT_GlyphSlotRec_ *GlyphData);
virtual ~cGlyph();
uint CharCode(void) const { return charCode; }
uchar *Bitmap(void) const { return bitmap; }
int AdvanceX(void) const { return advanceX; }
int AdvanceY(void) const { return advanceY; }
int Left(void) const { return left; }
int Top(void) const { return top; }
int Width(void) const { return width; }
int Rows(void) const { return rows; }
int Pitch(void) const { return pitch; }
int GetKerningCache(uint PrevSym) const;
void SetKerningCache(uint PrevSym, int Kerning);
};
cGlyph::cGlyph(uint CharCode, FT_GlyphSlotRec_ *GlyphData)
{
charCode = CharCode;
advanceX = GlyphData->advance.x >> 6;
advanceY = GlyphData->advance.y >> 6;
left = GlyphData->bitmap_left;
top = GlyphData->bitmap_top;
width = GlyphData->bitmap.width;
rows = GlyphData->bitmap.rows;
pitch = GlyphData->bitmap.pitch;
bitmap = MALLOC(uchar, rows * pitch);
memcpy(bitmap, GlyphData->bitmap.buffer, rows * pitch);
}
cGlyph::~cGlyph()
{
free(bitmap);
}
int cGlyph::GetKerningCache(uint PrevSym) const
{
for (int i = kerningCache.Size(); --i > 0; ) {
if (kerningCache[i].prevSym == PrevSym)
return kerningCache[i].kerning;
}
return KERNING_UNKNOWN;
}
void cGlyph::SetKerningCache(uint PrevSym, int Kerning)
{
kerningCache.Append(tKerning(PrevSym, Kerning));
}
class cFreetypeFont : public cFont {
private:
int height;
int bottom;
FT_Library library; ///< Handle to library
FT_Face face; ///< Handle to face object
mutable cList<cGlyph> glyphCacheMonochrome;
mutable cList<cGlyph> glyphCacheAntiAliased;
int Bottom(void) const { return bottom; }
int Kerning(cGlyph *Glyph, uint PrevSym) const;
cGlyph* Glyph(uint CharCode, bool AntiAliased = false) const;
public:
cFreetypeFont(const char *Name, int CharHeight, int CharWidth = 0);
virtual ~cFreetypeFont();
virtual int Width(uint c) const;
virtual int Width(const char *s) const;
virtual int Height(void) const { return height; }
virtual void DrawText(cBitmap *Bitmap, int x, int y, const char *s, tColor ColorFg, tColor ColorBg, int Width) const;
};
cFreetypeFont::cFreetypeFont(const char *Name, int CharHeight, int CharWidth)
{
height = 0;
bottom = 0;
int error = FT_Init_FreeType(&library);
if (!error) {
error = FT_New_Face(library, Name, 0, &face);
if (!error) {
if (face->num_fixed_sizes && face->available_sizes) { // fixed font
// TODO what exactly does all this mean?
height = face->available_sizes->height;
for (uint sym ='A'; sym < 'z'; sym++) { // search for descender for fixed font FIXME
FT_UInt glyph_index = FT_Get_Char_Index(face, sym);
error = FT_Load_Glyph(face, glyph_index, FT_LOAD_DEFAULT);
if (!error) {
error = FT_Render_Glyph(face->glyph, FT_RENDER_MODE_NORMAL);
if (!error) {
if (face->glyph->bitmap.rows-face->glyph->bitmap_top > bottom)
bottom = face->glyph->bitmap.rows-face->glyph->bitmap_top;
}
else
esyslog("ERROR: FreeType: error %d in FT_Render_Glyph", error);
}
else
esyslog("ERROR: FreeType: error %d in FT_Load_Glyph", error);
}
}
else {
error = FT_Set_Char_Size(face, // handle to face object
CharWidth * 64, // CharWidth in 1/64th of points
CharHeight * 64, // CharHeight in 1/64th of points
0, // horizontal device resolution
0); // vertical device resolution
if (!error) {
height = ((face->size->metrics.ascender-face->size->metrics.descender) + 63) / 64;
bottom = abs((face->size->metrics.descender - 63) / 64);
}
else
esyslog("ERROR: FreeType: error %d during FT_Set_Char_Size (font = %s)\n", error, Name);
}
}
else
esyslog("ERROR: FreeType: load error %d (font = %s)", error, Name);
}
else
esyslog("ERROR: FreeType: initialization error %d (font = %s)", error, Name);
}
cFreetypeFont::~cFreetypeFont()
{
FT_Done_Face(face);
FT_Done_FreeType(library);
}
int cFreetypeFont::Kerning(cGlyph *Glyph, uint PrevSym) const
{
int kerning = 0;
if (Glyph && PrevSym) {
kerning = Glyph->GetKerningCache(PrevSym);
if (kerning == KERNING_UNKNOWN) {
FT_Vector delta;
FT_UInt glyph_index = FT_Get_Char_Index(face, Glyph->CharCode());
FT_UInt glyph_index_prev = FT_Get_Char_Index(face, PrevSym);
FT_Get_Kerning(face, glyph_index_prev, glyph_index, FT_KERNING_DEFAULT, &delta);
kerning = delta.x / 64;
Glyph->SetKerningCache(PrevSym, kerning);
}
}
return kerning;
}
cGlyph* cFreetypeFont::Glyph(uint CharCode, bool AntiAliased) const
{
// Lookup in cache:
cList<cGlyph> *glyphCache = AntiAliased ? &glyphCacheAntiAliased : &glyphCacheMonochrome;
for (cGlyph *g = glyphCache->First(); g; g = glyphCache->Next(g)) {
if (g->CharCode() == CharCode)
return g;
}
FT_UInt glyph_index = FT_Get_Char_Index(face, CharCode);
// Load glyph image into the slot (erase previous one):
int error = FT_Load_Glyph(face, glyph_index, FT_LOAD_DEFAULT);
if (error)
esyslog("ERROR: FreeType: error during FT_Load_Glyph");
else {
#if ((FREETYPE_MAJOR == 2 && FREETYPE_MINOR == 1 && FREETYPE_PATCH >= 7) || (FREETYPE_MAJOR == 2 && FREETYPE_MINOR == 2 && FREETYPE_PATCH <= 1))// TODO workaround for bug? which one?
if (AntiAliased || CharCode == 32)
#else
if (AntiAliased)
#endif
error = FT_Render_Glyph(face->glyph, FT_RENDER_MODE_NORMAL);
else
error = FT_Render_Glyph(face->glyph, FT_RENDER_MODE_MONO);
if (error)
esyslog("ERROR: FreeType: error during FT_Render_Glyph %d, %d\n", CharCode, glyph_index);
else { //new bitmap
cGlyph *Glyph = new cGlyph(CharCode, face->glyph);
glyphCache->Add(Glyph);
return Glyph;
}
}
return NULL;
}
int cFreetypeFont::Width(uint c) const
{
cGlyph *g = Glyph(c, Setup.AntiAlias);
return g ? g->AdvanceX() : 0;
}
int cFreetypeFont::Width(const char *s) const
{
int w = 0;
if (s) {
uint prevSym = 0;
while (*s) {
int sl = Utf8CharLen(s);
uint sym = Utf8CharGet(s, sl);
s += sl;
cGlyph *g = Glyph(sym, Setup.AntiAlias);
if (g)
w += g->AdvanceX() + Kerning(g, prevSym);
prevSym = sym;
}
}
return w;
}
void cFreetypeFont::DrawText(cBitmap *Bitmap, int x, int y, const char *s, tColor ColorFg, tColor ColorBg, int Width) const
{
if (s && height) { // checking height to make sure we actually have a valid font
bool AntiAliased = Setup.AntiAlias && Bitmap->Bpp() >= 8;
tIndex fg = Bitmap->Index(ColorFg);
uint prevSym = 0;
while (*s) {
int sl = Utf8CharLen(s);
uint sym = Utf8CharGet(s, sl);
s += sl;
cGlyph *g = Glyph(sym, AntiAliased);
int kerning = Kerning(g, prevSym);
prevSym = sym;
uchar *buffer = g->Bitmap();
int symWidth = g->Width();
if (Width && x + symWidth + g->Left() + kerning - 1 > Width)
break; // we don't draw partial characters
if (x + symWidth + g->Left() + kerning > 0) {
for (int row = 0; row < g->Rows(); row++) {
for (int pitch = 0; pitch < g->Pitch(); pitch++) {
uchar bt = *(buffer + (row * g->Pitch() + pitch));
if (AntiAliased) {
if (bt > 0x00) {
int px = x + pitch + g->Left() + kerning;
int py = y + row + (height - Bottom() - g->Top());
if (bt == 0xFF)
Bitmap->SetIndex(px, py, fg);
else {
tColor bg = (ColorBg != clrTransparent) ? ColorBg : Bitmap->GetColor(px, py);
Bitmap->SetIndex(px, py, Bitmap->Index(Bitmap->Blend(ColorFg, bg, bt)));
}
}
}
else { //monochrome rendering
for (int col = 0; col < 8 && col + pitch * 8 <= symWidth; col++) {
if (bt & 0x80)
Bitmap->SetIndex(x + col + pitch * 8 + g->Left() + kerning, y + row + (height - Bottom() - g->Top()), fg);
bt <<= 1;
}
}
}
}
}
x += g->AdvanceX() + kerning;
if (x > Bitmap->Width() - 1)
break;
}
}
}
// --- cDummyFont ------------------------------------------------------------
// A dummy font, in case there are no fonts installed:
class cDummyFont : public cFont {
public:
virtual int Width(uint c) const { return 10; }
virtual int Width(const char *s) const { return 50; }
virtual int Height(void) const { return 20; }
virtual void DrawText(cBitmap *Bitmap, int x, int y, const char *s, tColor ColorFg, tColor ColorBg, int Width) const {}
};
// --- cFont -----------------------------------------------------------------
cFont *cFont::fonts[eDvbFontSize] = { NULL };
void cFont::SetFont(eDvbFont Font, const char *Name, int CharHeight)
{
cFont *f = CreateFont(Name, CharHeight);
if (!f || !f->Height())
f = new cDummyFont;
delete fonts[Font];
fonts[Font] = f;
}
const cFont *cFont::GetFont(eDvbFont Font)
{
if (Setup.UseSmallFont == 0 && Font == fontSml)
Font = fontOsd;
else if (Setup.UseSmallFont == 2)
Font = fontSml;
if (!fonts[Font]) {
switch (Font) {
case fontOsd: SetFont(Font, Setup.FontOsd, Setup.FontOsdSize); break;
case fontSml: SetFont(Font, Setup.FontSml, Setup.FontSmlSize); break;
case fontFix: SetFont(Font, Setup.FontFix, Setup.FontFixSize); break;
}
}
return fonts[Font];
}
cFont *cFont::CreateFont(const char *Name, int CharHeight, int CharWidth)
{
cString fn = GetFontFileName(Name);
if (*fn)
return new cFreetypeFont(fn, CharHeight, CharWidth);
return NULL;
}
bool cFont::GetAvailableFontNames(cStringList *FontNames, bool Monospaced)
{
if (!FontNames->Size()) {
FcInit();
FcObjectSet *os = FcObjectSetBuild(FC_FAMILY, FC_STYLE, NULL);
FcPattern *pat = FcPatternCreate();
FcPatternAddBool(pat, FC_SCALABLE, FcTrue);
if (Monospaced)
FcPatternAddInteger(pat, FC_SPACING, FC_MONO);
FcFontSet* fontset = FcFontList(NULL, pat, os);
for (int i = 0; i < fontset->nfont; i++) {
char *s = (char *)FcNameUnparse(fontset->fonts[i]);
if (s) {
// Strip i18n stuff:
char *c = strchr(s, ':');
if (c) {
char *p = strchr(c + 1, ',');
if (p)
*p = 0;
}
char *p = strchr(s, ',');
if (p) {
if (c)
memmove(p, c, strlen(c) + 1);
else
*p = 0;
}
// Make it user presentable:
s = strreplace(s, "\\", ""); // '-' is escaped
s = strreplace(s, "style=", "");
FontNames->Append(s); // takes ownership of s
}
}
FcFontSetDestroy(fontset);
FcPatternDestroy(pat);
FcObjectSetDestroy(os);
FcFini();
FontNames->Sort();
}
return FontNames->Size() > 0;
}
cString cFont::GetFontFileName(const char *FontName)
{
cString FontFileName;
if (FontName) {
char *fn = strdup(FontName);
fn = strreplace(fn, ":", ":style=");
fn = strreplace(fn, "-", "\\-");
FcInit();
FcPattern *pat = FcNameParse((FcChar8 *)fn);
FcPatternAddBool(pat, FC_SCALABLE, FcTrue);
FcConfigSubstitute(NULL, pat, FcMatchPattern);
FcDefaultSubstitute(pat);
FcFontSet *fontset = FcFontSort(NULL, pat, FcFalse, NULL, NULL);
for (int i = 0; i < fontset->nfont; i++) {
FcBool scalable;
FcPatternGetBool(fontset->fonts[i], FC_SCALABLE, 0, &scalable);
if (scalable) {
FcChar8 *s = NULL;
FcPatternGetString(fontset->fonts[i], FC_FILE, 0, &s);
FontFileName = (char *)s;
break;
}
}
FcFontSetDestroy(fontset);
FcPatternDestroy(pat);
free(fn);
FcFini();
}
return FontFileName;
}
// --- cTextWrapper ----------------------------------------------------------
cTextWrapper::cTextWrapper(void)
{
text = eol = NULL;
lines = 0;
lastLine = -1;
}
cTextWrapper::cTextWrapper(const char *Text, const cFont *Font, int Width)
{
text = NULL;
Set(Text, Font, Width);
}
cTextWrapper::~cTextWrapper()
{
free(text);
}
void cTextWrapper::Set(const char *Text, const cFont *Font, int Width)
{
free(text);
text = Text ? strdup(Text) : NULL;
eol = NULL;
lines = 0;
lastLine = -1;
if (!text)
return;
lines = 1;
if (Width <= 0)
return;
char *Blank = NULL;
char *Delim = NULL;
int w = 0;
stripspace(text); // strips trailing newlines
for (char *p = text; *p; ) {
int sl = Utf8CharLen(p);
uint sym = Utf8CharGet(p, sl);
if (sym == '\n') {
lines++;
w = 0;
Blank = Delim = NULL;
p++;
continue;
}
else if (sl == 1 && isspace(sym))
Blank = p;
int cw = Font->Width(sym);
if (w + cw > Width) {
if (Blank) {
*Blank = '\n';
p = Blank;
continue;
}
else {
// Here's the ugly part, where we don't have any whitespace to
// punch in a newline, so we need to make room for it:
if (Delim)
p = Delim + 1; // let's fall back to the most recent delimiter
char *s = MALLOC(char, strlen(text) + 2); // The additional '\n' plus the terminating '\0'
int l = p - text;
strncpy(s, text, l);
s[l] = '\n';
strcpy(s + l + 1, p);
free(text);
text = s;
p = text + l;
continue;
}
}
else
w += cw;
if (strchr("-.,:;!?_", *p)) {
Delim = p;
Blank = NULL;
}
p += sl;
}
}
const char *cTextWrapper::Text(void)
{
if (eol) {
*eol = '\n';
eol = NULL;
}
return text;
}
const char *cTextWrapper::GetLine(int Line)
{
char *s = NULL;
if (Line < lines) {
if (eol) {
*eol = '\n';
if (Line == lastLine + 1)
s = eol + 1;
eol = NULL;
}
if (!s) {
s = text;
for (int i = 0; i < Line; i++) {
s = strchr(s, '\n');
if (s)
s++;
else
break;
}
}
if (s) {
if ((eol = strchr(s, '\n')) != NULL)
*eol = 0;
}
lastLine = Line;
}
return s;
}
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