mirror of
git://projects.qi-hardware.com/ben-blinkenlights.git
synced 2024-11-05 16:27:12 +02:00
483 lines
10 KiB
C
483 lines
10 KiB
C
/*
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* gui.c - Graphical output for ubb-la
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*
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* Written 2013 by Werner Almesberger
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* Copyright 2013 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 <stdarg.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <alloca.h>
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#include "SDL.h"
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#include "SDL_gfxPrimitives.h"
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#include "SDL_gfxPrimitives_font.h"
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#include "gui.h"
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#if 0
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#define DEBUG(fmt, ...) fprintf(stderr, fmt, __VA_ARGS__)
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#else
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#define DEBUG(fmt, ...)
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#endif
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#define XRES 320 /* canvas width */
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#define YRES 240 /* canvas height */
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/* ----- Colors ------------------------------------------------------------ */
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#define TEXT_RGBA 0xffffffff /* general text */
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#define UNIT_RGBA 0xb0e0ffff /* units */
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#define MAP_BUF_RGBA 0x808080ff /* buffer in the map */
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#define MAP_VIEW_RGBA 0xffffffff /* current view in the map */
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#define CENTER_RGBA 0x5080ffff /* center marker */
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#define LEVEL_RGBA 0xffff00ff /* constant level or single change */
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#define BOUNCE_RGBA 0xff8080ff /* bouncing signal */
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#define LABEL_RGBA 0xffffffff /* channel label */
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#define DIV_RGBA 0x808080ff /* divisions */
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/* ----- Layout ------------------------------------------------------------ */
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#define XCENTER ((XRES+CH_XOFF)/2)
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#define XWIDTH (XRES-CH_XOFF)
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#define MAP_BUF_Y0 2
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#define MAP_BUF_Y1 8
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#define MAP_VIEW_Y0 0
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#define MAP_VIEW_Y1 10
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#define CENTER_W 8
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#define CENTER_Y0 20
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#define CENTER_Y1 24
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#define CH_XOFF 30
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#define CH_YOFF 30
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#define CH_SKIP 16
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#define CH_HEIGHT 8
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#define DIV_X 32
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#define DIV_Y 6
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#define MAX_ZOOM 3
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#define UNIT_GAP 2 /* space between number and unit */
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#define POS_X 168
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#define POS_Y (MEAS_DIV_Y-8-3)
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#define MEAS_DIV_Y (FREQ_Y-3-1)
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#define FREQ_X 0
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#define FREQ_Y 222
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#define INTERVAL_X 0
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#define INTERVAL_Y (FREQ_Y+8+2)
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#define DIV_SAMP_X (DIV_INT_X-8)
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#define DIV_SAMP_Y FREQ_Y
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#define DIV_INT_X 80
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#define DIV_INT_Y INTERVAL_Y
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/* ----- Miscellaneous definitions ----------------------------------------- */
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#define REPEAT_DELAY_MS 300
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#define REPEAT_INTERVAL_MS 30
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static SDL_Surface *surf;
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/* ----- SDL initialization and screen-wide functions ---------------------- */
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void gui_init(void)
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{
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if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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fprintf(stderr, "SDL_init: %s\n", SDL_GetError());
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exit(1);
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}
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atexit(SDL_Quit);
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surf = SDL_SetVideoMode(XRES, YRES, 0, SDL_SWSURFACE);
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if (!surf) {
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fprintf(stderr, "SDL_SetVideoMode: %s\n", SDL_GetError());
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exit(1);
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}
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SDL_EnableKeyRepeat(REPEAT_DELAY_MS, REPEAT_INTERVAL_MS);
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}
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static void clear(void)
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{
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SDL_LockSurface(surf);
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SDL_FillRect(surf, NULL, SDL_MapRGB(surf->format, 0, 0, 0));
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}
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static void update(void)
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{
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SDL_UnlockSurface(surf);
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SDL_UpdateRect(surf, 0, 0, 0, 0);
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}
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/* ----- Text output ------------------------------------------------------- */
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/*
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* stringColor from SDL_gfx fails for some reason. SDL_ttf is just too much
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* compatibility trouble. So we do our own.
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*/
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static void textf(int x, int y, uint32_t color, const char *fmt, ...)
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{
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va_list ap;
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char *tmp, *s;
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uint8_t *p;
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int n, ix, iy;
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va_start(ap, fmt);
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n = vsnprintf(NULL, 0, fmt, ap);
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va_end(ap);
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tmp = alloca(n+1);
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va_start(ap, fmt);
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vsnprintf(tmp, n+1, fmt, ap);
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va_end(ap);
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for (s = tmp; *s; s++) {
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p = gfxPrimitivesFontdata+(*s << 3);
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for (iy = 0; iy != 8; iy++) {
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for (ix = 0; ix != 8; ix++)
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if ((*p << ix) & 0x80)
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pixelColor(surf, x+ix, y+iy, color);
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p++;
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}
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x += 8;
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}
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}
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/* ----- Map of buffer and view -------------------------------------------- */
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static void show_map(int skip, int nibbles, int s0, int s1)
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{
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int w = nibbles-skip;
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int m = (nibbles-skip) >> 1;
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int scale = 0;
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int x0, x1;
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while (w >= XWIDTH/2) {
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w >>= 1;
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scale++;
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}
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boxColor(surf, XCENTER-(w >> 1), MAP_BUF_Y0,
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XCENTER+(w >> 1), MAP_BUF_Y1, MAP_BUF_RGBA);
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x0 = (s0-m+(XCENTER << scale)) >> scale;
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x1 = x0+((s1-s0) >> scale);
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rectangleColor(surf, x0, MAP_VIEW_Y0, x1, MAP_VIEW_Y1, MAP_VIEW_RGBA);
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}
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/* ----- Waveform elements ------------------------------------------------- */
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static inline int ch_y(int ch, int v)
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{
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return CH_YOFF+CH_SKIP*ch+(v ? 0 : CH_HEIGHT);
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}
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static void bounce(int x, int ch)
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{
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vlineColor(surf, x, ch_y(ch, 0), ch_y(ch, 1), BOUNCE_RGBA);
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}
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static void change(int x, int ch)
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{
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vlineColor(surf, x, ch_y(ch, 0), ch_y(ch, 1), LEVEL_RGBA);
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}
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static void level(int x0, int x1, int ch, int v)
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{
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if (x0 == x1)
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pixelColor(surf, x0, ch_y(ch, v), LEVEL_RGBA);
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else
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hlineColor(surf, x0, x1, ch_y(ch, v), LEVEL_RGBA);
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}
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/* ----- Show (part of) a buffer ------------------------------------------- */
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static void show_buffer_zoom_in(const uint8_t *buf, int skip, int nibbles,
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int x0, int x1)
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{
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int f = (x1-x0)/(nibbles-skip);
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int x, i, j;
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int last[4] = { -1, -1, -1, -1};
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uint8_t v, bit;
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DEBUG("in: %d-%d (%d) Sa; %d-%d (%d) pix; %d f (%d)\n",
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skip, nibbles, nibbles-skip, x0, x1, x1-x0, f, f*(nibbles-skip));
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x = x0;
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for (i = skip; i != nibbles; i++) {
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v = (buf[i >> 1] >> 4*(~i & 1)) & 0xf;
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for (j = 0; j != 4; j++) {
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bit = (v >> j) & 1;
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if (bit == last[j] || last[j] == -1) {
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level(x, x+f-1, j, bit);
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} else {
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change(x, j);
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level(x+1, x+f-1, j, bit);
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}
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last[j] = bit;
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}
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x += f;
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}
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}
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static void show_buffer_zoom_out(const uint8_t *buf, int skip, int nibbles,
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int x0, int x1)
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{
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int f = (nibbles-skip)/(x1-x0);
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int x;
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int i = skip, n, j;
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int changes[4], last[4] = { -1, -1, -1, -1}, next[4];
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uint8_t v, bit;
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DEBUG("out: %d-%d (%d) Sa; %d-%d (%d) pix; %d f (%d)\n",
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skip, nibbles, nibbles-skip, x0, x1, x1-x0, f, f*(x1-x0));
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for (x = x0; x != x1; x++) {
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n = i+f;
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for (j = 0; j != 4; j++) {
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next[j] = last[j];
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changes[j] = 0;
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}
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while (i != n) {
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v = (buf[i >> 1] >> 4*(~i & 1)) & 0xf;
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for (j = 0; j != 4; j++) {
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bit = (v >> j) & 1;
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if (bit != next[j]) {
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changes[j]++;
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next[j] = bit;
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}
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}
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i++;
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}
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for (j = 0; j != 4; j++) {
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if (changes[j] > 1)
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bounce(x, j);
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else if (!changes[j] || last[j] == -1)
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level(x, x, j, next[j]);
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else
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change(x, j);
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last[j] = next[j];
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}
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}
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}
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static void show_buffer(const uint8_t *buf, int skip, int nibbles,
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int x0, int x1, int zoom, int pos)
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{
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int xm, w, s, p0, p1;
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int d, dp;
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xm = (x0+x1) >> 1;
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dp = pos-((nibbles-skip) >> 1);
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DEBUG("show: %d-%d Sa; %d-%d pix; pos %d dp %d; xm %d xcenter %d\n",
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skip, nibbles, x0, x1, pos, dp, xm, XCENTER);
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if (zoom < 0) {
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s = (x1-x0) << -zoom;
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show_map(skip, nibbles, pos-s/2, pos+s/2);
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w = (nibbles-skip) >> -zoom;
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p0 = xm-(w >> 1)-(dp >> -zoom);
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p1 = xm+((w+1) >> 1)-(dp >> -zoom);
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if (p0 < x0) {
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skip += (x0-p0) << -zoom;
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p0 = x0;
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}
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if (p1 > x1) {
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nibbles -= (p1-x1) << -zoom;
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p1 = x1;
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}
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show_buffer_zoom_out(buf, skip, nibbles, p0, p1);
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} else {
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s = (x1-x0) >> zoom;
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show_map(skip, nibbles, pos-s/2, pos+s/2);
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w = (nibbles-skip) << zoom;
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p0 = xm-(w >> 1)-(dp << zoom);
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p1 = xm+((w+1) >> 1)-(dp << zoom);
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if (p0 < x0) {
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d = ((x0-p0)+(1 << zoom)-1) >> zoom;
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skip += d;
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p0 += d << zoom;
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}
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if (p1 > x1) {
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d = ((p1-x1)+(1 << zoom)-1) >> zoom;
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nibbles -= d;
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p1 -= d << zoom;
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}
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show_buffer_zoom_in(buf, skip, nibbles, p0, p1);
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}
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}
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/* ----- Display the sample frequency -------------------------------------- */
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static void si_text(int x, int y, double v, const char *unit, int digits)
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{
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const char *pfx;
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if (v >= 1e6) {
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v /= 1e6;
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pfx = "M";
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} else if (v >= 1e3) {
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v /= 1e3;
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pfx = "k";
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} else if (v >= 1) {
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pfx = " ";
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} else if (v >= 1e-3) {
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v *= 1e3;
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pfx = "m";
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} else if (v >= 1e-6) {
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v *= 1e6;
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pfx = "u";
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} else {
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v *= 1e9;
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pfx = "n";
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}
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if (v >= 10 && digits == 3)
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textf(x, y, TEXT_RGBA, "%3d", (int) (v+0.5));
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else if (v >= 100 && digits == 4)
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textf(x, y, TEXT_RGBA, "%4d", (int) (v+0.5));
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else if (v >= 100)
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textf(x, y, TEXT_RGBA, "%*.*f", digits, digits-4, v);
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else if (v >= 10)
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textf(x, y, TEXT_RGBA, "%*.*f", digits, digits-3, v);
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else
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textf(x, y, TEXT_RGBA, "%*.*f", digits, digits-2, v);
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textf(x+digits*8+UNIT_GAP, y, UNIT_RGBA, "%s%s", pfx, unit);
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}
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static void show_freq(double freq, int zoom)
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{
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int div;
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si_text(FREQ_X, FREQ_Y, freq, "Sa/s", 3);
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si_text(INTERVAL_X, INTERVAL_Y, 1/freq, "s/Sa", 3);
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div = (DIV_X >> MAX_ZOOM) << (MAX_ZOOM-zoom);
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textf(DIV_SAMP_X, DIV_SAMP_Y, TEXT_RGBA, "%4d", div);
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textf(DIV_SAMP_X+4*8+UNIT_GAP, DIV_SAMP_Y, UNIT_RGBA, "Sa/div", div);
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si_text(DIV_INT_X, DIV_INT_Y, div/freq, "s/div", 3);
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}
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/* ----- Show a divisions -------------------------------------------------- */
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static void show_divisions(void)
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{
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int n = XWIDTH/2/DIV_X;
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int i;
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for (i = -n; i <= n; i++)
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vlineColor(surf, XCENTER+i*DIV_X,
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ch_y(0, 1)-DIV_Y, ch_y(3, 0)+DIV_Y,
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i ? DIV_RGBA : CENTER_RGBA);
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}
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/* ----- Main event loop --------------------------------------------------- */
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static int pos_step(int zoom)
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{
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return 1 << (MAX_ZOOM-zoom+1);
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}
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void gui(const uint8_t *buf, int skip, int nibbles, double freq)
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{
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SDL_Event event;
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int pos = (skip+nibbles) >> 1;
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int zoom; /* < 0: zoom out; 0: 1 pixel = 1 sample; > 1: zoom in */
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int min_zoom = 0;
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int i;
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while (XWIDTH < (nibbles-skip) >> -min_zoom)
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min_zoom--;
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zoom = min_zoom;
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while (1) {
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clear();
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for (i = 0; i != 4; i++)
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textf(0, ch_y(i, 1), LABEL_RGBA, "CH%d", i);
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show_divisions();
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filledTrigonColor(surf, XCENTER, CENTER_Y1,
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XCENTER-CENTER_W/2, CENTER_Y0,
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XCENTER+CENTER_W/2, CENTER_Y0, CENTER_RGBA);
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show_buffer(buf, skip, nibbles, CH_XOFF, XRES, zoom, pos);
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show_freq(freq, zoom);
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si_text(POS_X, POS_Y, pos/freq, "s", 7);
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hlineColor(surf, 0, XRES-1, MEAS_DIV_Y, DIV_RGBA);
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update();
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while (1) {
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SDL_WaitEvent(&event);
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switch (event.type) {
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case SDL_KEYDOWN:
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switch (event.key.keysym.sym) {
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case SDLK_UP:
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if (zoom < MAX_ZOOM)
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zoom++;
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break;
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case SDLK_DOWN:
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if (zoom > min_zoom)
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zoom--;
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break;
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case SDLK_LEFT:
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pos -= pos_step(zoom);
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if (pos < 0)
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pos = 0;
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break;
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case SDLK_RIGHT:
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pos += pos_step(zoom);
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if (pos > nibbles-1)
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pos = nibbles-1;
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break;
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case SDLK_RETURN:
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case SDLK_q:
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return;
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default:
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printf("%x\n", event.key.keysym.sym);
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continue;
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}
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break;
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case SDL_QUIT:
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return;
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default:
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continue;
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}
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break;
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}
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}
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}
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