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text.cpp
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text.cpp
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/* Copyright (c) David Cunningham and the Grit Game Engine project 2015
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* 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 AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <cstdlib>
#include <cstdio>
#include <cmath>
#include <cstring>
#include <string>
#include <iostream>
#include <fstream>
#include <ft2build.h>
// wrap in #ifdef to keep makedepend happy
#ifdef FT_FREETYPE_H
#include FT_FREETYPE_H
#endif
FT_Library ft2;
#include <lua_util.h>
#include <unicode_util.h>
#include <exception.h>
#include "text.h"
#include "image.h"
void text_init (void)
{
if (0 != FT_Init_FreeType(&ft2)) {
EXCEPT << "Couldn't initialise the FreeType2 font library." << std::endl;
}
}
Image<1,0> *make_text_codepoint (const std::string &font, uimglen_t font_w, uimglen_t font_h, unsigned long cp)
{
FT_Face face;
int error = FT_New_Face(ft2, font.c_str(), 0, &face);
if (error == FT_Err_Unknown_File_Format) {
EXCEPT<<"Unknown file format reading: "<<font<<std::endl;
} else if (error != 0) {
EXCEPT<<"Could not read "<<font<<": "<<error<<std::endl;
}
error = FT_Set_Pixel_Sizes(face, font_w, font_h);
if (0 != error) {
FT_Done_Face(face);
EXCEPT<<"Could not set font size ("<<font_w<<","<<font_h<<") for font "<<font<<": "<<error<<std::endl;
}
error = FT_Load_Char(face, cp, FT_LOAD_RENDER);
if (0 != error) {
FT_Done_Face(face);
EXCEPT<<"Could not load glyph "<<cp<<" for font "<<font<<": "<<error<<std::endl;
}
// record max in here
simglen_t max_x = (face->glyph->advance.x-1) / 64;
simglen_t max_y = face->size->metrics.ascender/64;
simglen_t min_x = 0; // always zero
simglen_t min_y = (face->size->metrics.descender+1) / 64;
//std::cout << "(" << min_x << "," << min_y << ") (" << max_x << "," << max_y << ")" << std::endl;
//std::cout << bool(FT_IS_SCALABLE(face)) << std::endl;
Colour<1,0> bg(0);
Colour<1,1> fg(1);
Image<1,0> *img = image_make<1,0>(max_x-min_x+1, max_y-min_y+1, bg);
if (face->glyph->bitmap.num_grays == 1) {
for (uimglen_t p=0 ; p<face->glyph->bitmap.width ; p++) {
for (uimglen_t q=0 ; q<face->glyph->bitmap.rows ; q++) {
unsigned char byte = (unsigned char)(face->glyph->bitmap.buffer[q * face->glyph->bitmap.pitch + p/8]);
unsigned char v = (byte >> (7-(p % 8))) & 1;
img->drawPixelSafe(simglen_t(face->glyph->bitmap_left) + p - min_x,
simglen_t(face->glyph->bitmap_top) - q - min_y,
&fg,
float(v));
}
}
} else if (face->glyph->bitmap.num_grays == 256) {
for (uimglen_t p=0 ; p<face->glyph->bitmap.width ; p++) {
for (uimglen_t q=0 ; q<face->glyph->bitmap.rows ; q++) {
img->drawPixelSafe(simglen_t(face->glyph->bitmap_left) + p - min_x,
simglen_t(face->glyph->bitmap_top) - q - min_y,
&fg,
(unsigned char)(face->glyph->bitmap.buffer[q * face->glyph->bitmap.pitch + p]) / 255.0f);
}
}
} else {
FT_Done_Face(face);
EXCEPTEX<<font<<": "<<face->glyph->bitmap.num_grays<<std::endl;
}
FT_Done_Face(face);
return img;
}
Image<1,0> *make_text (const std::string &font, uimglen_t font_w, uimglen_t font_h, const std::string &text,
float xx, float xy, float yx, float yy)
{
FT_Face face;
int error = FT_New_Face(ft2, font.c_str(), 0, &face);
if (error == FT_Err_Unknown_File_Format) {
EXCEPT<<"Unknown file format reading: "<<font<<std::endl;
} else if (error != 0) {
EXCEPT<<"Could not read "<<font<<": "<<error<<std::endl;
}
error = FT_Set_Pixel_Sizes(face, font_w, font_h);
if (0 != error) {
FT_Done_Face(face);
EXCEPT<<"Could not set font size ("<<font_w<<","<<font_h<<") for font "<<font<<": "<<error<<std::endl;
}
FT_Matrix matrix;
matrix.xx = 0x10000L * xx;
matrix.xy = 0x10000L * xy;
matrix.yx = 0x10000L * yx;
matrix.yy = 0x10000L * yy;
FT_Vector pen;
pen.x = 0;
pen.y = 0;
// record max in here
simglen_t max_x = 0;
simglen_t max_y = 0;
simglen_t min_x = 0;
simglen_t min_y = 0;
// calculate size
for (size_t i=0 ; i<text.length() ; ++i) {
unsigned long cp = decode_utf8(text, i);
FT_Set_Transform(face, &matrix, &pen);
error = FT_Load_Char(face, cp, FT_LOAD_RENDER);
if (0 != error) {
FT_Done_Face(face);
EXCEPT<<"Could not load glyph "<<cp<<" for font "<<font<<": "<<error<<std::endl;
}
for (uimglen_t p=0 ; p<face->glyph->bitmap.width ; p++) {
for (uimglen_t q=0 ; q<face->glyph->bitmap.rows ; q++) {
simglen_t x = simglen_t(face->glyph->bitmap_left) + p;
simglen_t y = simglen_t(face->glyph->bitmap_top) - q;
if (!FT_IS_SCALABLE(face)) {
x += pen.x / 64;
y += pen.y / 64;
}
if (x > max_x) max_x = x;
if (y > max_y) max_y = y;
if (x < min_x) min_x = x;
if (y < min_y) min_y = y;
}
}
pen.x += face->glyph->advance.x;
pen.y += face->glyph->advance.y;
}
Colour<1,0> bg(0);
Colour<1,1> fg(1);
Image<1,0> *img = image_make<1,0>(max_x-min_x+1, max_y-min_y+1, bg);
pen.x = 0;
pen.y = 0;
// draw
for (size_t i=0 ; i<text.length() ; ++i) {
FT_Set_Transform(face, &matrix, &pen);
unsigned long cp = decode_utf8(text, i);
error = FT_Load_Char(face, cp, FT_LOAD_RENDER);
if (0 != error) {
FT_Done_Face(face);
EXCEPT<<"Could not load glyph "<<cp<<" for font "<<font<<": "<<error<<std::endl;
}
if (face->glyph->bitmap.num_grays == 1) {
for (uimglen_t p=0 ; p<face->glyph->bitmap.width ; p++) {
for (uimglen_t q=0 ; q<face->glyph->bitmap.rows ; q++) {
unsigned char byte = (unsigned char)(face->glyph->bitmap.buffer[q * face->glyph->bitmap.pitch + p/8]);
unsigned char v = (byte >> (7-(p % 8))) & 1;
img->drawPixelSafe(simglen_t(face->glyph->bitmap_left) + p - min_x + simglen_t(pen.x/64),
simglen_t(face->glyph->bitmap_top) - q - min_y + simglen_t(pen.y/64),
&fg,
float(v));
}
}
} else if (face->glyph->bitmap.num_grays == 256) {
for (uimglen_t p=0 ; p<face->glyph->bitmap.width ; p++) {
for (uimglen_t q=0 ; q<face->glyph->bitmap.rows ; q++) {
img->drawPixelSafe(simglen_t(face->glyph->bitmap_left) + p - min_x,
simglen_t(face->glyph->bitmap_top) - q - min_y,
&fg,
(unsigned char)(face->glyph->bitmap.buffer[q * face->glyph->bitmap.pitch + p]) / 255.0f);
}
}
} else {
FT_Done_Face(face);
EXCEPTEX<<font<<": "<<face->glyph->bitmap.num_grays<<std::endl;
}
pen.x += face->glyph->advance.x;
pen.y += face->glyph->advance.y;
}
FT_Done_Face(face);
return img;
}