73 lines
2.1 KiB
C
73 lines
2.1 KiB
C
/*
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* Copyright (c) 2014, 2015 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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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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