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vdr/font.c

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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.
*
* BiDi support by Osama Alrawab <alrawab@hotmail.com> @2008 Tripoli-Libya.
*
* $Id: font.c 3.2 2014/01/07 12:19:45 kls Exp $
*/
#include "font.h"
#include <ctype.h>
#include <fontconfig/fontconfig.h>
#ifdef BIDI
#include <fribidi.h>
#endif
#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:
cString fontName;
int size;
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 const char *FontName(void) const { return fontName; }
virtual int Size(void) const { return size; }
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;
virtual void DrawText(cPixmap *Pixmap, int x, int y, const char *s, tColor ColorFg, tColor ColorBg, int Width) const;
};
cFreetypeFont::cFreetypeFont(const char *Name, int CharHeight, int CharWidth)
{
fontName = Name;
size = CharHeight;
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
{
// Non-breaking space:
if (CharCode == 0xA0)
CharCode = 0x20;
// 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;
}
}
#define UNKNOWN_GLYPH_INDICATOR '?'
if (CharCode != UNKNOWN_GLYPH_INDICATOR)
return Glyph(UNKNOWN_GLYPH_INDICATOR, AntiAliased);
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) {
#ifdef BIDI
cString bs = Bidi(s);
s = bs;
#endif
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;
}
#define MAX_BLEND_LEVELS 256
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
#ifdef BIDI
cString bs = Bidi(s);
s = bs;
#endif
bool AntiAliased = Setup.AntiAlias && Bitmap->Bpp() >= 8;
bool TransparentBackground = ColorBg == clrTransparent;
int16_t BlendLevelIndex[MAX_BLEND_LEVELS]; // tIndex is 8 bit unsigned, so a negative value can be used to mark unused entries
if (AntiAliased && !TransparentBackground)
memset(BlendLevelIndex, 0xFF, sizeof(BlendLevelIndex)); // initializes the array with negative values
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);
if (!g)
continue;
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());
tColor bg;
if (bt == 0xFF)
bg = fg;
else if (TransparentBackground)
bg = Bitmap->Index(Bitmap->Blend(ColorFg, Bitmap->GetColor(px, py), bt));
else if (BlendLevelIndex[bt] >= 0)
bg = BlendLevelIndex[bt];
else
bg = BlendLevelIndex[bt] = Bitmap->Index(Bitmap->Blend(ColorFg, ColorBg, bt));
Bitmap->SetIndex(px, py, bg);
}
}
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;
}
}
}
void cFreetypeFont::DrawText(cPixmap *Pixmap, 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
#ifdef BIDI
cString bs = Bidi(s);
s = bs;
#endif
bool AntiAliased = Setup.AntiAlias;
uint prevSym = 0;
while (*s) {
int sl = Utf8CharLen(s);
uint sym = Utf8CharGet(s, sl);
s += sl;
cGlyph *g = Glyph(sym, AntiAliased);
if (!g)
continue;
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)
Pixmap->DrawPixel(cPoint(x + pitch + g->Left() + kerning, y + row + (height - Bottom() - g->Top())), AlphaBlend(ColorFg, ColorBg, bt));
}
else { //monochrome rendering
for (int col = 0; col < 8 && col + pitch * 8 <= symWidth; col++) {
if (bt & 0x80)
Pixmap->DrawPixel(cPoint(x + col + pitch * 8 + g->Left() + kerning, y + row + (height - Bottom() - g->Top())), ColorFg);
bt <<= 1;
}
}
}
}
}
x += g->AdvanceX() + kerning;
if (x > Pixmap->DrawPort().Width() - 1)
break;
}
}
}
// --- cDummyFont ------------------------------------------------------------
// A dummy font, in case there are no fonts installed:
class cDummyFont : public cFont {
private:
int height;
public:
cDummyFont(int CharHeight) { height = CharHeight; }
virtual int Width(uint c) const { return height; }
virtual int Width(const char *s) const { return height; }
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 {}
virtual void DrawText(cPixmap *Pixmap, 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)
{
delete fonts[Font];
fonts[Font] = CreateFont(Name, constrain(CharHeight, MINFONTSIZE, MAXFONTSIZE));
}
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, min(Setup.FontSmlSize, Setup.FontOsdSize)); break;
case fontFix: SetFont(Font, Setup.FontFix, Setup.FontFixSize); break;
default: esyslog("ERROR: unknown Font %d (%s %d)", Font, __FUNCTION__, __LINE__);
}
}
return fonts[Font];
}
cFont *cFont::CreateFont(const char *Name, int CharHeight, int CharWidth)
{
cString fn = GetFontFileName(Name);
cFont *f = *fn ? new cFreetypeFont(fn, CharHeight, CharWidth) : NULL;
if (!f || !f->Height())
f = new cDummyFont(CharHeight);
return f;
}
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(); // older versions of fontconfig are broken - and FcInit() can be called more than once
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);
FcResult fresult;
FcFontSet *fontset = FcFontSort(NULL, pat, FcFalse, NULL, &fresult);
if (fontset) {
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);
}
else
esyslog("ERROR: no usable font found for '%s'", FontName);
FcPatternDestroy(pat);
free(fn);
//FcFini(); // older versions of fontconfig are broken - and FcInit() can be called more than once
}
return FontFileName;
}
#ifdef BIDI
cString cFont::Bidi(const char *Ltr)
{
if (!cCharSetConv::SystemCharacterTable()) { // bidi requires UTF-8
fribidi_set_mirroring(true);
fribidi_set_reorder_nsm(false);
FriBidiCharSet fribidiCharset = FRIBIDI_CHAR_SET_UTF8;
int LtrLen = strlen(Ltr);
FriBidiCharType Base = FRIBIDI_TYPE_L;
FriBidiChar *Logical = MALLOC(FriBidiChar, LtrLen + 1) ;
int RtlLen = fribidi_charset_to_unicode(fribidiCharset, const_cast<char *>(Ltr), LtrLen, Logical);
FriBidiChar *Visual = MALLOC(FriBidiChar, LtrLen + 1) ;
char *Rtl = NULL;
bool ok = fribidi_log2vis(Logical, RtlLen, &Base, Visual, NULL, NULL, NULL);
if (ok) {
fribidi_remove_bidi_marks(Visual, RtlLen, NULL, NULL, NULL);
Rtl = MALLOC(char, RtlLen * 4 + 1);
fribidi_unicode_to_charset(fribidiCharset, Visual, RtlLen, Rtl);
}
free(Logical);
free(Visual);
if (ok)
return cString(Rtl, true);
}
return cString(Ltr);
}
#endif
// --- 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 if (w > 0) { // there has to be at least one character before the newline
// 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;
}
}
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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