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/*
* Text layout and parsing functions
*
* Copyright (C) 2019 Patrick McDermott
*
* This file is part of fbcon2png.
*
* fbcon2png 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; either version 2 of the License, or
* (at your option) any later version.
*
* fbcon2png is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with fbcon2png. If not, see <http://www.gnu.org/licenses/>.
*/
#include "text.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <png.h>
#include "font.h"
#include "i18n.h"
#include "output.h"
#include "sgr.h"
#define MAX(a, b) (((a) > (b)) ? (a) : (b))
struct text {
size_t size;
size_t read;
unsigned char *string;
size_t width;
size_t height;
};
static unsigned char
_getc(struct text *text, FILE *stream, unsigned char *c)
{
int i_c;
assert(text);
assert(stream);
assert(c);
if (text->read == text->size) {
text->size += 8192;
text->string = realloc(text->string, text->size);
}
i_c = fgetc(stream);
if (i_c == EOF) {
i_c = 0;
}
return text->string[text->read++] = *c = i_c;
}
struct text *
text_new(FILE *stream)
{
struct text *text;
size_t width;
int eol;
unsigned char c;
assert(stream);
text = calloc(1, sizeof(*text));
if (!text) {
error(_("Cannot allocate memory for text object"));
return NULL;
}
width = 0;
eol = 0;
_getc(text, stream, &c);
while (c) {
if (c == 0x1B && _getc(text, stream, &c) == '[') { /* CSI */
_getc(text, stream, &c);
for (; c >= 0x30 && c <= 0x3F; _getc(text, stream, &c));
for (; c >= 0x20 && c <= 0x2F; _getc(text, stream, &c));
if (c >= 0x40 && c <= 0x7E) {
_getc(text, stream, &c);
} else {
error(_("Invalid control sequence at line %lu "
"column %lu"),
text->height + 1, width + 1);
}
eol = 0;
} else if (c == '\n') {
text->width = MAX(text->width, width);
width = 0;
++text->height;
_getc(text, stream, &c);
eol = 1;
} else {
++width;
_getc(text, stream, &c);
eol = 0;
}
}
if (!eol) {
++text->height;
}
return text;
}
size_t
text_get_width(const struct text *text)
{
assert(text);
return text->width;
}
size_t
text_get_height(const struct text *text)
{
assert(text);
return text->height;
}
size_t
text_set_width(struct text *text, size_t width)
{
assert(text);
assert(width > 0);
return text->width = MAX(text->width, width);
}
size_t
text_set_height(struct text *text, size_t height)
{
assert(text);
assert(height > 0);
return text->height = MAX(text->height, height);
}
void
text_render(const struct text *text, const struct font *font, png_byte **rows)
{
unsigned char *string_start;
unsigned char *string;
size_t row;
size_t col;
unsigned char *parameter;
png_color fg = {170, 170, 170};
png_color bg = { 0, 0, 0};
assert(text);
assert(font);
assert(rows);
string_start = calloc(strlen((char *) text->string) + 1,
sizeof(*text->string));
if (!string_start) {
error(_("Cannot allocate memory for text rendering"));
return;
}
memcpy(string_start, text->string, strlen((char *) text->string) + 1);
string = string_start;
row = 0;
col = 0;
while (string && *string) {
if (*string == 0x1B && *(++string) == '[') { /* CSI */
++string;
parameter = string;
for (; *string >= 0x30 && *string <= 0x3F; ++string);
for (; *string >= 0x20 && *string <= 0x2F; ++string);
if (*string >= 0x40 && *string <= 0x7E) {
if (*string == 'm') {
*string = '\0';
sgr(parameter, &fg, &bg);
}
++string;
}
} else if (*string == '\n') {
for (; col < text->width; ++col) {
font_render(font, &fg,&bg, ' ', rows, row, col);
}
col = 0;
++row;
++string;
} else {
font_render(font, &fg, &bg, *string, rows, row, col);
++col;
++string;
}
}
for (; row < text->height; ++row) {
for (; col < text->width; ++col) {
font_render(font, &fg, &bg, ' ', rows, row, col);
}
col = 0;
}
free(string_start);
}
struct text *
text_destroy(struct text **text_p)
{
struct text *text;
assert(text_p && *text_p);
text = *text_p;
free(text->string);
free(text);
return text = NULL;
}
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