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git://projects.qi-hardware.com/ben-blinkenlights.git
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080978ade0
- Makefile (OBJS): added ppm.o and ppmimg.o - ppm.h (load_ppm), ppm.c: PPM file loader, adapted from eda-tools/schhist/ppmdiff/ppmdiff.c - ubb-vga.h (img_name, ppmimg), ppmimg.c: PPM image to frame buffer converter - ubb-vga2.c (usage, main): the threshold is now set with the option -l - ubb-vga2.c (usage, main): if a second argument is given, treat it as a PPM file - ubb-vga2.c (usage): also documented option -t
64 lines
1.2 KiB
C
64 lines
1.2 KiB
C
/*
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* ppmimg.c - Convert a PPM image
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*
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* Written 2011 by Werner Almesberger
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* Copyright 2011 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include "ppm.h"
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#include "ubb-vga.h"
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char *img_name;
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static uint8_t pattern(int r, int g, int b)
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{
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return ((r ? R_VAL : 0) | (g ? G_VAL : 0) | (b ? B_VAL : 0))*0x11;
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}
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static void convert(uint8_t *f, int xres, int yres, uint8_t *ppm)
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{
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int x, y;
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uint8_t v, last = 0;
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for (y = 0; y != yres; y++)
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for (x = 0; x != xres; x++) {
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v = pattern(ppm[0] >= thres, ppm[1] >= thres,
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ppm[2] >= thres);
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if (x & 1) {
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*f++ = last | v;
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} else {
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last = v << 4;
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}
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ppm += 3;
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}
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}
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void ppmimg(void *f, int xres, int yres)
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{
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uint8_t *ppm;
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int xr = 0, yr = 0;
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ppm = load_ppm(img_name, &xr, &yr);
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if (xr != xres || yr != yres) {
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fprintf(stderr, "image is %dx%d, display is %dx%d\n",
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xr, yr, xres, yres);
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exit(1);
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}
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convert(f, xres, yres, ppm);
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free(ppm);
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}
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