76 lines
2.2 KiB
C
76 lines
2.2 KiB
C
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2014, 2015.
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This program is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the Free
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Software Foundation, either version 3 of the License, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along with
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this program. If not, see <http://www.gnu.org/licenses/>.
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vgafont.c
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VGA font.
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*******************************************************************************/
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#include <fcntl.h>
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#include <ioleast.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <unistd.h>
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#include "framebuffer.h"
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#include "vgafont.h"
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unsigned char font[FONT_CHARSIZE * FONT_NUMCHARS];
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bool load_font()
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{
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static bool done = false;
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if ( done )
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return true;
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int fd = open("/dev/vgafont", O_RDONLY);
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if ( fd < 0 )
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return false;
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if ( readall(fd, font, sizeof(font)) != sizeof(font) )
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return false;
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close(fd);
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return done = true;
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}
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void render_char(struct framebuffer fb, char c, uint32_t color)
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{
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unsigned char uc = (unsigned char) c;
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uint32_t buffer[FONT_HEIGHT * (FONT_WIDTH+1)];
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for ( size_t y = 0; y < FONT_HEIGHT; y++ )
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{
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unsigned char line_bitmap = font[uc * FONT_CHARSIZE + y];
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for ( size_t x = 0; x < FONT_WIDTH; x++ )
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buffer[y * (FONT_WIDTH+1) + x] = line_bitmap & 1U << (7 - x) ? color : 0;
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buffer[y * (FONT_WIDTH+1) + 8] = 0; //line_bitmap & 1U << 0 ? color : 0;
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}
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struct framebuffer character_fb;
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character_fb.xres = FONT_WIDTH + 1;
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character_fb.yres = FONT_HEIGHT;
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character_fb.pitch = character_fb.xres;
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character_fb.buffer = buffer;
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framebuffer_copy_to_framebuffer_blend(fb, character_fb);
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}
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void render_text(struct framebuffer fb, const char* str, uint32_t color)
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{
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for ( size_t i = 0; str[i]; i++ )
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render_char(framebuffer_crop(fb, (FONT_WIDTH+1) * i, 0, fb.xres, fb.yres),
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str[i], color);
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}
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