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vdr/font.c
Klaus Schmidinger 991eda0067 Version 1.7.7 
- The new function cDevice::GetVideoSize() returns the size and aspect ratio
  of the video material currently displayed. This function is used to determine
  the proper size of the OSD. Plugin authors should implement this function in
  classes derived from cDevice, if they are able to replay video.
- The OSD and font sizes are now defined in percent of the actual video display
  size. The maximum OSD size has been raised to 1920x1080, to allow full
  screen OSD on HD systems.
- The OSD size is now automatically adjusted to the actual video display
  (provided the output device implements the GetVideoSize() function).
- cFrameDetector::Analyze() now syncs on the TS packet sync bytes (thanks to
  Oliver Endriss for reporting broken index generation after a buffer overflow).
2009-05-03 17:15:00 +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 2.2 2009/05/03 11:15:39 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
{
// 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) {
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
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;
}
}
}
// --- 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, min(max(CharHeight, MINFONTSIZE), MAXFONTSIZE));
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(); // 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);
FcFontSet *fontset = FcFontSort(NULL, pat, FcFalse, NULL, NULL);
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;
}
// --- 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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