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/*
* targavfd plugin for VDR (C++)
*
* (C) 2010 Andreas Brachold <vdr07 AT deltab de>
* Glyph handling based on <vdr/font.c>
*
* This targavfd plugin is free software: you can redistribute it and/or
* modify it under the terms of the GNU General Public License as published
* by the Free Software Foundation, version 3 of the License.
*
* See the files README and COPYING for details.
*
*/
#include <vdr/tools.h>
#include "ffont.h"
// --- cVFDFont ---------------------------------------------------------
#define KERNING_UNKNOWN (-10000)
cVFDGlyph::cVFDGlyph(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);
}
cVFDGlyph::~cVFDGlyph()
{
free(bitmap);
}
int cVFDGlyph::GecVFDKerningCache(uint PrevSym) const
{
for (int i = kerningCache.Size(); --i > 0; ) {
if (kerningCache[i].prevSym == PrevSym)
return kerningCache[i].kerning;
}
return KERNING_UNKNOWN;
}
void cVFDGlyph::SecVFDKerningCache(uint PrevSym, int Kerning)
{
kerningCache.Append(cVFDKerning(PrevSym, Kerning));
}
cVFDFont::cVFDFont(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("targaVFD: FreeType: error %d in FT_Render_Glyph", error);
}
else
esyslog("targaVFD: FreeType: error %d in FT_Load_Glyph", error);
}
}
else {
error = FT_Set_Char_Size(face, // handle to face object
CharWidth << 6, // CharWidth in 1/64th of points
CharHeight << 6, // CharHeight in 1/64th of points
CharWidth > 8 ? 64 : 80, // horizontal device resolution
72); // 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("targaVFD: FreeType: error %d during FT_Set_Char_Size (font = %s)\n", error, Name);
}
}
else
esyslog("targaVFD: FreeType: load error %d (font = %s)", error, Name);
}
else
esyslog("targaVFD: FreeType: initialization error %d (font = %s)", error, Name);
}
cVFDFont::~cVFDFont()
{
FT_Done_Face(face);
FT_Done_FreeType(library);
}
int cVFDFont::Kerning(cVFDGlyph *Glyph, uint PrevSym) const
{
int kerning = 0;
if (Glyph && PrevSym) {
kerning = Glyph->GecVFDKerningCache(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->SecVFDKerningCache(PrevSym, kerning);
}
}
return kerning;
}
cVFDGlyph* cVFDFont::Glyph(uint CharCode) const
{
// Non-breaking space:
if (CharCode == 0xA0)
CharCode = 0x20;
// Lookup in cache:
cList<cVFDGlyph> *glyphCache = &glyphCacheMonochrome;
for (cVFDGlyph *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("targaVFD: 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))
if (CharCode == 32) // workaround for libfreetype bug
error = FT_Render_Glyph(face->glyph, FT_RENDER_MODE_NORMAL);
else
#endif
error = FT_Render_Glyph(face->glyph, FT_RENDER_MODE_MONO);
if (error)
esyslog("targaVFD: FreeType: error during FT_Render_Glyph %d, %d\n", CharCode, glyph_index);
else { //new bitmap
cVFDGlyph *Glyph = new cVFDGlyph(CharCode, face->glyph);
glyphCache->Add(Glyph);
return Glyph;
}
}
#define UNKNOWN_GLYPH_INDICATOR '?'
if (CharCode != UNKNOWN_GLYPH_INDICATOR)
return Glyph(UNKNOWN_GLYPH_INDICATOR);
return NULL;
}
int cVFDFont::Width(uint c) const
{
cVFDGlyph *g = Glyph(c);
return g ? g->AdvanceX() : 0;
}
int cVFDFont::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;
cVFDGlyph *g = Glyph(sym);
if (g)
w += g->AdvanceX() + Kerning(g, prevSym);
prevSym = sym;
}
}
return w;
}
int cVFDFont::DrawText(cVFDBitmap *Bitmap, int x, int y, const char *s, int Width) const
{
if (s && height) { // checking height to make sure we actually have a valid font
uint prevSym = 0;
while (*s) {
int sl = Utf8CharLen(s);
uint sym = Utf8CharGet(s, sl);
s += sl;
cVFDGlyph *g = Glyph(sym);
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)
return 1; // 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));
for (int col = 0; col < 8 && col + pitch * 8 <= symWidth; col++) {
if (bt & 0x80)
Bitmap->SetPixel(x + col + pitch * 8 + g->Left() + kerning,
y + row + (height - Bottom() - g->Top()));
bt <<= 1;
}
}
}
}
x += g->AdvanceX() + kerning;
if (x > Bitmap->Width() - 1)
return 1;
}
return 0;
}
return -1;
}
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