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ftalleg.cpp
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ftalleg.cpp
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/*
--------------
About
--------------
A Freetype wrapper for use with allegro
Feel free to do whatever you like with this, by all means enjoy!
Just add it to your project
--------------
Linking
--------------
on linux:
g++ `freetype-config --cflags` ftalleg.cpp myfiles.cpp `freetype-config --libs` `allegro-config --libs`
on windows (you may need to include the freetype dir location, ie -Ic:/mingw/include):
g++ ftalleg.cpp myfiles.cpp -lfreetype -lalleg
--------------
Disclaimer
--------------
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE,
TITLE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE
SOFTWARE BE LIABLE FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef FT_FONT_CPP
#define FT_FONT_CPP
#include "bitmap.h"
/*
#include <allegro.h>
#ifdef _WIN32
#include <winalleg.h>
#endif
*/
#include "ftalleg.h"
#include <iostream>
#include <sstream>
#include <cassert>
#include <exception>
namespace ftalleg{
Exception::Exception():
std::exception(){
}
Exception::Exception(const std::string reason):
std::exception(),
reason(reason){
}
Exception::~Exception() throw(){
}
// typedef void (*pixeler)( BITMAP * bitmap, int x, int y, int color );
static int fixColor(const unsigned char *c,short grays){
// Safety checks
assert(c != 0);
assert(grays != 1);
// invariant: c can be dereferenced safely
// invariant: (grays - 1) != 0, thus it can be used as divisor.
int red = *c * 255 / (grays - 1);
int green = *c * 255 / (grays - 1);
int blue = *c * 255 / (grays - 1);
//alpha = *c * 255 / (grays - 1);
return Bitmap::makeColor(red,green,blue);
}
// Static count of instances of fonts to track library
static int instances=0;
static FT_Library ftLibrary = 0;
character::character() {
}
character::~character() {
if (line){
delete [] line;
}
}
fontSize::fontSize() {
width = height = italics = angle = 0;
}
fontSize::~fontSize() {
}
bool fontSize::operator<(const fontSize &fs) const {
return (width<fs.width || height<fs.height || italics<fs.italics);
}
/* im not sure this is a very unique key.. */
int fontSize::createKey() const {
return ((width+10) * (height+20) * (italics+250));
}
//! Constructor
freetype::freetype(const Filesystem::AbsolutePath & str, const int x, const int y ):
face(NULL){
//Load library
if ( !ftLibrary ){
FT_Init_FreeType(&ftLibrary);
}
instances++;
faceLoaded = kerning = false;
currentIndex = 0;
currentFilename = "";
faceName = "";
// currentChar = new character;
systemName="";
internalFix = false;
this->load(str, 0, x, y );
}
//! Destructor
freetype::~freetype(){
//if(face!=NULL)FT_Done_Face(face);
if ( instances > 0 ){
instances--;
}
if ( instances == 0 ){
FT_Done_FreeType(ftLibrary);
}
destroyGlyphIndex();
/*
if ( currentChar ){
delete currentChar;
}
*/
}
void freetype::destroyGlyphIndex(){
for (std::map<int, std::map<signed long, character*> >::iterator i1 = fontTable.begin(); i1 != fontTable.end(); i1++){
std::map<signed long, character*> & characters = (*i1).second;
for (std::map<signed long, character*>::iterator i2 = characters.begin(); i2 != characters.end(); i2++){
character * character = (*i2).second;
delete character;
}
}
}
// Extract glyph
character * freetype::extractGlyph(signed long unicode){
int w, h, ew;
character * tempChar = new character();
// Translate it according to the given italics
double italics = (double)(size.italics)*GLYPH_PI/180;
FT_Matrix matrix;
matrix.xx = 0x10000L;
matrix.xy = (FT_Fixed)( sin( italics ) * (GLYPH_SQRT2*0x10000L) );
matrix.yx = 0;
matrix.yy = 0x10000L;
FT_Set_Transform( face, &matrix, 0 );
FT_Load_Char(face, unicode, FT_LOAD_TARGET_NORMAL | FT_LOAD_RENDER | FT_LOAD_FORCE_AUTOHINT);
w = face->glyph->bitmap.width;
h = face->glyph->bitmap.rows;
ew = 0;
if (!w)ew = 1;
if (!h)h = 1;
tempChar->width = (w + ew);
tempChar->height = h;
tempChar->rows = face->glyph->bitmap.rows;
tempChar->grays = face->glyph->bitmap.num_grays;
tempChar->pitch = face->glyph->bitmap.pitch;
tempChar->line = new unsigned char[tempChar->rows * tempChar->pitch];
memcpy(tempChar->line, face->glyph->bitmap.buffer, tempChar->rows * tempChar->pitch);
tempChar->left = face->glyph->bitmap_left;
tempChar->top = face->glyph->bitmap_top;
tempChar->right = face->glyph->advance.x >> 6;
tempChar->unicode = unicode;
tempChar->length = ((w + ew)+face->glyph->advance.x) >> 6;
return tempChar;
}
// Create single index
void freetype::createIndex(){
std::map<int, std::map<signed long, character*> >::iterator p;
p = fontTable.find(size.createKey());
if (p == fontTable.end()){
FT_Set_Pixel_Sizes(face, size.width, size.height);
FT_UInt glyphIndex;
FT_ULong unicode = FT_Get_First_Char(face, &glyphIndex);
std::map<signed long, character*> tempMap;
while (glyphIndex != 0){
tempMap.insert(std::make_pair(unicode, extractGlyph(unicode)));
unicode = FT_Get_Next_Char(face, unicode, &glyphIndex);
}
fontTable.insert(std::make_pair(size.createKey(), tempMap));
}
if (fontTable.find(size.createKey()) == fontTable.end()){
printf("ftalleg: inconsistency error\n");
throw std::exception();
}
}
/*
pixeler getPutPixel(){
switch( get_color_depth() ){
case 8 : return _putpixel;
case 15 : return _putpixel15;
case 16 : return _putpixel16;
case 24 : return _putpixel24;
case 32 : return _putpixel32;
default : return putpixel;
}
}
*/
void drawOneCharacter(const character * tempChar, int & x1, int & y1, FT_UInt sizeHeight, const Bitmap & bitmap, const int & color){
unsigned char *line = tempChar->line;
int colorRed = Bitmap::getRed(color);
int colorGreen = Bitmap::getGreen(color);
int colorBlue = Bitmap::getBlue(color);
for (int y = 0; y < tempChar->rows; y++){
unsigned char *buffer = line;
for (int x = 0; x < tempChar->width; x++){
int col = fixColor(buffer++,tempChar->grays);
int red = Bitmap::getRed(col);
int green = Bitmap::getGreen(col);
int blue = Bitmap::getBlue(col);
if ((red < 50) ||
(green < 50) ||
(blue < 50)){
continue;
}
red = red * colorRed / 255;
green = green * colorGreen / 255;
blue = blue * colorBlue / 255;
//col.alpha= col.alpha * color.alpha / 255;
// putpixel(bitmap,x1+tempChar.left+x,y1 - tempChar.top+y + size.height,makecol(red,blue,green));
/* dangerous! putter is probably one of the _putpixel* routines so if x or y are off the bitmap
* you will get a segfault
*/
// putter(bitmap,x1+tempChar.left+x,y1 - tempChar.top+y + size.height,makecol(red,blue,green));
// putter = 0;
int finalX = x1+tempChar->left+x;
int finalY = y1 - tempChar->top + y + sizeHeight;
bitmap.putPixelNormal(finalX, finalY, Bitmap::makeColor(red, green, blue));
}
line += tempChar->pitch;
}
x1 += tempChar->right;
}
// Render a character from the lookup table
void freetype::drawCharacter(signed long unicode, int &x1, int &y1, const Bitmap & bitmap, const int &color){
// pixeler putter = getPutPixel();
std::map<int, std::map<signed long, character*> >::iterator ft;
ft = fontTable.find(size.createKey());
if (ft != fontTable.end()){
std::map<signed long, character*>::iterator p;
p = (ft->second).find(unicode);
if (p != ft->second.end()){
const character * tempChar = p->second;
drawOneCharacter(tempChar, x1, y1, size.height, bitmap, color);
}
}
}
//! Load font from memory
bool freetype::load(const unsigned char *memoryFont, unsigned int length, int index, unsigned int width, unsigned int height) {
if(!FT_New_Memory_Face(ftLibrary,memoryFont, length,index,&face)) {
currentFilename = "memoryFont";
currentIndex = index;
faceLoaded = true;
size.italics = 0;
setSize(width, height);
if (FT_HAS_GLYPH_NAMES(face)){
char buff[1024];
if(!FT_Get_Glyph_Name(face, currentIndex,buff, sizeof(buff))){
faceName = currentFilename;
}
else faceName = std::string(buff);
} else {
faceName = currentFilename;
}
if(FT_HAS_KERNING(face))kerning=true;
else kerning = false;
} else {
faceLoaded=false;
std::cout << "Load system font failed\n";
}
return faceLoaded;
}
//! Load font from file
bool freetype::load(const Filesystem::AbsolutePath & filename, int index, unsigned int width, unsigned int height){
if (!FT_New_Face(ftLibrary, filename.path().c_str(), index, &face)){
currentFilename = filename.path();
currentIndex = index;
faceLoaded = true;
size.italics = 0;
setSize(width, height);
if (FT_HAS_GLYPH_NAMES(face)){
char buff[1024];
if(!FT_Get_Glyph_Name(face,currentIndex,buff,sizeof(buff))) {
faceName = currentFilename;
}
else faceName = std::string(buff);
} else {
faceName = currentFilename;
}
if(FT_HAS_KERNING(face))kerning=true;
else kerning = false;
} else {
faceLoaded=false;
}
return faceLoaded;
}
/* utf8 decoding */
static long decodeUnicode(const std::string & input, unsigned int * position){
unsigned char byte1 = (unsigned char) input[*position];
/* one byte - ascii */
if (byte1 >> 7 == 0){
return byte1;
}
if (byte1 >> 5 == 6){
*position += 1;
unsigned char byte2 = (unsigned char) input[*position];
int top = byte1 & 31;
int bottom = byte2 & 63;
return (top << 6) + bottom;
}
if (byte1 >> 4 == 14){
*position += 1;
unsigned char byte2 = (unsigned char) input[*position];
*position += 1;
unsigned char byte3 = (unsigned char) input[*position];
int top4 = byte1 & 15;
int middle6 = byte2 & 63;
int bottom6 = byte3 & 63;
return (top4 << (6+6)) + (middle6 << 6) + bottom6;
}
if (byte1 >> 3 == 30){
*position += 1;
unsigned char byte2 = (unsigned char) input[*position];
*position += 1;
unsigned char byte3 = (unsigned char) input[*position];
*position += 1;
unsigned char byte4 = (unsigned char) input[*position];
int unit1 = byte1 & 7;
int unit2 = byte2 & 63;
int unit3 = byte3 & 63;
int unit4 = byte4 & 63;
return (unit1 << 18) + (unit2 << 12) + (unit3 << 6) + unit4;
}
return 0;
}
//! Get text length
int freetype::getLength(const std::string & text) {
int length=0;
std::map<int, std::map<signed long, character*> >::iterator ft;
ft = fontTable.find(size.createKey());
if (ft != fontTable.end()){
for (unsigned int i = 0; i < text.length(); i++) {
std::map<signed long, character*>::iterator p;
signed long unicode = decodeUnicode(text, &i);
p = (ft->second).find(unicode);
if (p != (ft->second).end()){
if (p != fontTable[size.createKey()].end()){
length += (p->second)->length;
}
}
}
}
return length;
}
//! Render font to a bitmap
void freetype::render(int x, int y, const int & color, const Bitmap & bmp, ftAlign alignment, const std::string & text, int marker ...) {
if (faceLoaded){
int rend_x = 0;
int rend_y = 0;
std::ostringstream str;
/* use vsnprintf/Util::limitPrintf here? */
// Get extra arguments
va_list ap;
va_start(ap, marker);
for(unsigned int i = 0; i<text.length();++i) {
if (text[i] == '%') {
if(text[i+1]=='s') {
str << va_arg(ap, char *);
++i;
} else if(text[i+1]=='d'||text[i+1]=='i') {
str << va_arg(ap, signed int);
++i;
} else if(text[i+1]=='c') {
str << (char)va_arg(ap, int);
++i;
} else str << text[i];
} else {
str << text[i];
}
}
va_end(ap);
std::string fixedText(str.str());
switch (alignment) {
case ftLeft:
rend_x = x;
rend_y = y;
break;
case ftCenter:
rend_x = x - getLength(fixedText)/2;
rend_y = y;
break;
case ftRight:
rend_x = x - getLength(fixedText);
rend_y = y;
break;
default:
rend_x = x;
rend_y = y;
break;
}
int previous = 0;
int next = 0;
for (unsigned int i = 0; i<fixedText.length(); i++){
long unicode = decodeUnicode(fixedText, &i);
if (kerning && previous && next){
next = FT_Get_Char_Index(face, unicode);
FT_Vector delta;
FT_Get_Kerning(face, previous, next, FT_KERNING_DEFAULT, &delta);
rend_x += delta.x >> 6;
previous = next;
}
drawCharacter(unicode, rend_x, rend_y, bmp, color);
}
}
}
int freetype::calculateMaximumHeight(){
/* uhh, comment out the printf's ?? */
std::map<int, std::map<signed long, character*> >::iterator ft;
ft = fontTable.find(size.createKey());
int top = 0;
long code = 0;
if ( ft != fontTable.end() ){
std::map<signed long, character*>::iterator p;
std::map< signed long, character* > & map = ft->second;
for ( p = map.begin(); p != map.end(); p++ ){
const character * ch = p->second;
printf( "%c( %ld ). top = %d. rows = %d. total = %d\n", (char) ch->unicode, ch->unicode, ch->top, ch->rows, ch->top + ch->rows );
if ( ch->top + ch->rows > top ){
code = ch->unicode;
top = ch->top + ch->rows;
}
}
}
printf( "Largest letter = %ld\n", code );
return top;
}
int freetype::height( long code ) const {
std::map<int, std::map<signed long, character*> >::const_iterator ft;
ft = fontTable.find( size.createKey() );
if ( ft != fontTable.end() ){
std::map<signed long, character*>::const_iterator p;
p = (ft->second).find( code );
if ( p != (ft->second).end() ){
const character * temp = p->second;
// printf( "%c top = %d rows = %d\n", (char) code, temp.top, temp.rows );
return temp->top + temp->rows;
}
} else {
throw Exception("Internal inconsistency");
}
return 0;
}
int freetype::calculateHeight( const std::string & str ) const {
int max = 0;
for ( unsigned int i = 0; i < str.length(); i++ ){
int q = height( str[ i ] );
// printf( "Height of %c is %d\n", str[ i ], q );
if ( q > max ){
max = q;
}
}
return max;
}
//! Set size
void freetype::setSize( unsigned int w, unsigned int h){
if ( w != size.width || h != size.height ){
if (internalFix)return;
if (w<=0 || h<=0)return;
size.width = w;
size.height = h;
createIndex();
// maximumHeight = calculateMaximumHeight();
}
}
//! Set italics
void freetype::setItalics(int i){
if(internalFix)return;
if(i<-45)i=(-45);
else if(i>45)i=45;
size.italics = i;
createIndex();
}
void freetype::getSize(int * w, int * h) const {
*w = size.width;
*h = size.height;
}
//! Get Width
int freetype::getWidth() const {
return size.width;
}
//! Get Height
int freetype::getHeight( const std::string & str ) const {
// return size.height;
return calculateHeight( str );
}
//! Get Italics
int freetype::getItalics(){
return size.italics;
}
}
#endif /* FONT_BASE_CPP */

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