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/* Copyright (c) 2015 imv authors
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "util.h"
#include <unistd.h>
#include <stddef.h>
#include <errno.h>
#include <fontconfig/fontconfig.h>
size_t read_from_stdin(void **buffer) {
size_t len = 0;
ssize_t r;
size_t step = 1024; /* Arbitrary value of 1 KiB */
void *p;
errno = 0; /* clear errno */
for(*buffer = NULL; (*buffer = realloc((p = *buffer), len + step));
len += (size_t)r) {
if((r = read(STDIN_FILENO, (uint8_t *)*buffer + len, step)) <= 0) {
break;
}
}
/* realloc(3) leaves old buffer allocated in case of error */
if(*buffer == NULL && p != NULL) {
int save = errno;
free(p);
errno = save;
len = 0;
}
return len;
}
TTF_Font *load_font(const char *font_spec)
{
int font_size;
char *font_name;
/* figure out font size from name, or default to 24 */
char *sep = strchr(font_spec, ':');
if(sep) {
font_name = strndup(font_spec, sep - font_spec);
font_size = strtol(sep+1, NULL, 10);
} else {
font_name = strdup(font_spec);
font_size = 24;
}
FcConfig *cfg = FcInitLoadConfigAndFonts();
FcPattern *pattern = FcNameParse((const FcChar8*)font_name);
FcConfigSubstitute(cfg, pattern, FcMatchPattern);
FcDefaultSubstitute(pattern);
TTF_Font *ret = NULL;
FcResult result = FcResultNoMatch;
FcPattern* font = FcFontMatch(cfg, pattern, &result);
if (font) {
FcChar8 *path = NULL;
if (FcPatternGetString(font, FC_FILE, 0, &path) == FcResultMatch) {
ret = TTF_OpenFont((char*)path, font_size);
}
FcPatternDestroy(font);
}
FcPatternDestroy(pattern);
free(font_name);
return ret;
}
SDL_Texture *create_chequered(SDL_Renderer *renderer)
{
SDL_RendererInfo ri;
SDL_GetRendererInfo(renderer, &ri);
int width = 512;
int height = 512;
if(ri.max_texture_width != 0 && ri.max_texture_width < width) {
width = ri.max_texture_width;
}
if(ri.max_texture_height != 0 && ri.max_texture_height < height) {
height = ri.max_texture_height;
}
const int box_size = 16;
/* Create a chequered texture */
const unsigned char l = 196;
const unsigned char d = 96;
size_t pixels_len = 3 * width * height;
unsigned char *pixels = malloc(pixels_len);
for(int y = 0; y < height; y++) {
for(int x = 0; x < width; x += box_size) {
unsigned char color = l;
if(((x/box_size) % 2 == 0) ^ ((y/box_size) % 2 == 0)) {
color = d;
}
memset(pixels + 3 * x + 3 * width * y, color, 3 * box_size);
}
}
SDL_Texture *ret = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGB24,
SDL_TEXTUREACCESS_STATIC,
width, height);
SDL_UpdateTexture(ret, NULL, pixels, 3 * width);
free(pixels);
return ret;
}
static int parse_hex_digit(char c) {
if(c >= '0' && c <= '9') {
return c - '0';
} else if (c >= 'a' && c <= 'f') {
return c - 'a' + 10;
} else if (c >= 'A' && c <= 'F') {
return c - 'A' + 10;
}
return -1;
}
int parse_hex_color(const char* str,
unsigned char *r, unsigned char *g, unsigned char *b)
{
if(str[0] == '#') {
++str;
}
if(strlen(str) != 6) {
return 1;
}
for(int i = 0; i < 6; ++i) {
if(!isxdigit(str[i])) {
return 1;
}
}
*r = (parse_hex_digit(str[0]) << 4) + parse_hex_digit(str[1]);
*g = (parse_hex_digit(str[2]) << 4) + parse_hex_digit(str[3]);
*b = (parse_hex_digit(str[4]) << 4) + parse_hex_digit(str[5]);
return 0;
}
void imv_printf(SDL_Renderer *renderer, TTF_Font *font, int x, int y,
SDL_Color *fg, SDL_Color *bg, const char *fmt, ...)
{
char line[512];
va_list args;
va_start(args, fmt);
vsnprintf(line, sizeof(line), fmt, args);
SDL_Surface *surf = TTF_RenderUTF8_Blended(font, &line[0], *fg);
SDL_Texture *tex = SDL_CreateTextureFromSurface(renderer, surf);
SDL_Rect tex_rect = {0,0,0,0};
SDL_QueryTexture(tex, NULL, NULL, &tex_rect.w, &tex_rect.h);
tex_rect.x = x;
tex_rect.y = y;
/* draw bg if wanted */
if(bg->a > 0) {
SDL_SetRenderDrawColor(renderer, bg->r, bg->g, bg->b, bg->a);
SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_BLEND);
SDL_RenderFillRect(renderer, &tex_rect);
}
SDL_RenderCopy(renderer, tex, NULL, &tex_rect);
SDL_DestroyTexture(tex);
SDL_FreeSurface(surf);
va_end(args);
}
/* vim:set ts=2 sts=2 sw=2 et: */
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