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sixel: initial support
This implements basic parsing of sixel data. Lots of limitations and temporary solutions as this is still work-in-progress: * Maximum image size hardcoded to 800x800 * No HLS color format support * Image is always rendered at 0x0 in the terminal
This commit is contained in:
Daniel Eklöf
parent
e8197d22f7
commit
9e3bfb1eab
6 changed files with 350 additions and 3 deletions
284
sixel.c
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284
sixel.c
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#include "sixel.h"
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#include <string.h>
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#define LOG_MODULE "sixel"
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#define LOG_ENABLE_DBG 0
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#include "log.h"
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#include "render.h"
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#define max(x, y) ((x) > (y) ? (x) : (y))
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static const size_t COLOR_COUNT = 1024;
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static const size_t IMAGE_WIDTH = 800;
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static const size_t IMAGE_HEIGHT = 800;
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static size_t count;
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void
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sixel_init(struct terminal *term)
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{
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if (term->sixel.pix != NULL) {
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pixman_image_unref(term->sixel.pix);
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free(term->sixel.image);
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term->sixel.pix = NULL;
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term->sixel.image = NULL;
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}
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assert(term->sixel.palette == NULL);
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assert(term->sixel.image == NULL);
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if (term->sixel.image != NULL) {
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if (term->sixel.pix != NULL) {
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pixman_image_unref(term->sixel.pix);
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term->sixel.pix = NULL;
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}
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free(term->sixel.image);
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}
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term->sixel.state = SIXEL_SIXEL;
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term->sixel.row = 0;
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term->sixel.col = 0;
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term->sixel.color_idx = 0;
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term->sixel.max_col = 0;
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term->sixel.param = 0;
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term->sixel.param_idx = 0;
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memset(term->sixel.params, 0, sizeof(term->sixel.params));
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term->sixel.palette = calloc(COLOR_COUNT, sizeof(term->sixel.palette[0]));
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term->sixel.image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT, sizeof(term->sixel.image[0]));
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count = 0;
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/* TODO: default palette */
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}
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void
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sixel_unhook(struct terminal *term)
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{
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free(term->sixel.palette);
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term->sixel.palette = NULL;
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if (term->sixel.pix != NULL)
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pixman_image_unref(term->sixel.pix);
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LOG_DBG("generating %dx%d pixman image", term->sixel.row * 6, term->sixel.max_col);
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if (term->sixel.col > 0) {
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if (term->sixel.col > term->sixel.max_col)
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term->sixel.max_col = term->sixel.col;
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term->sixel.row++;
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term->sixel.col = 0;
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}
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term->sixel.pix = pixman_image_create_bits_no_clear(
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PIXMAN_a8r8g8b8,
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term->sixel.max_col,
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term->sixel.row * 6,
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term->sixel.image,
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IMAGE_WIDTH * sizeof(uint32_t));
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size_t lines = max(1, term->sixel.row * 6 / term->cell_height);
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for (size_t i = 0; i < lines; i++)
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term_linefeed(term);
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render_refresh(term);
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}
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static void
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sixel_add(struct terminal *term, uint32_t color, uint8_t sixel)
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{
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LOG_DBG("adding sixel %02hhx using color 0x%06x", sixel, color);
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if (term->sixel.col >= IMAGE_WIDTH) {
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LOG_WARN("column outside image width");
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return;
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}
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if (term->sixel.row >= IMAGE_HEIGHT) {
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LOG_WARN("row outside image height");
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return;
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}
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for (int i = 0; i < 6; i++) {
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int bit = sixel & 1;
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sixel >>= 1;
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if (bit) {
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size_t idx = (term->sixel.row * 6 + i) * IMAGE_WIDTH + term->sixel.col;
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term->sixel.image[idx] = 0x00 << 24 | color;
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}
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}
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assert(sixel == 0);
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term->sixel.col++;
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}
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static void
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sixel_sixel(struct terminal *term, uint8_t c)
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{
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switch (c) {
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case '"':
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term->sixel.state = SIXEL_RASTER;
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term->sixel.param = 0;
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term->sixel.param_idx = 0;
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break;
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case '#':
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term->sixel.state = SIXEL_COLOR;
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term->sixel.color_idx = 0;
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term->sixel.param = 0;
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term->sixel.param_idx = 0;
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break;
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case '$':
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if (term->sixel.col > term->sixel.max_col)
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term->sixel.max_col = term->sixel.col;
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term->sixel.col = 0;
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break;
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case '-':
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if (term->sixel.col > term->sixel.max_col)
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term->sixel.max_col = term->sixel.col;
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term->sixel.row++;
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term->sixel.col = 0;
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break;
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case '!':
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term->sixel.state = SIXEL_REPEAT;
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term->sixel.param = 0;
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term->sixel.param_idx = 0;
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break;
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default:
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if (c < '?' || c > '~') {
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LOG_ERR("invalid sixel charactwer: '%c' at idx=%zu", c, count);
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return;
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}
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sixel_add(term, term->sixel.palette[term->sixel.color_idx], c - 63);
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break;
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}
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}
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static void
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sixel_repeat(struct terminal *term, uint8_t c)
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{
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if (c >= '0' && c <= '9') {
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term->sixel.param *= 10;
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term->sixel.param += c - '0';
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} else {
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LOG_DBG("repeating '%c' %u times", c, term->sixel.param);
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term->sixel.state = SIXEL_SIXEL;
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for (unsigned i = 0; i < term->sixel.param; i++)
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sixel_sixel(term, c);
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}
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}
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static void
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sixel_raster(struct terminal *term, uint8_t c)
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{
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if (c >= '0' && c <= '9') {
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term->sixel.param *= 10;
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term->sixel.param += c - '0';
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} else {
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if (term->sixel.param_idx < sizeof(term->sixel.params) / sizeof(term->sixel.params[0]))
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term->sixel.params[term->sixel.param_idx++] = term->sixel.param;
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term->sixel.param = 0;
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if (c != ';') {
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unsigned pan __attribute__((unused)) = term->sixel.params[0];
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unsigned pad __attribute__((unused)) = term->sixel.params[1];
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unsigned ph __attribute__((unused)) = term->sixel.params[2];
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unsigned pv __attribute__((unused)) = term->sixel.params[3];
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LOG_DBG("pan=%u, pad=%u (aspect ratio = %u), size=%ux%u",
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pan, pad, pan / pad, ph, pv);
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}
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switch (c) {
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case '#': term->sixel.state = SIXEL_COLOR; break;
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case ';': term->sixel.state = SIXEL_RASTER; break;
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default: term->sixel.state = SIXEL_SIXEL; sixel_sixel(term, c); break;
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}
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}
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}
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static void
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sixel_color(struct terminal *term, uint8_t c)
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{
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if (c >= '0' && c <= '9') {
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term->sixel.param *= 10;
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term->sixel.param += c - '0';
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} else {
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if (term->sixel.param < COLOR_COUNT)
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term->sixel.color_idx = term->sixel.param;
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else
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term->sixel.color_idx = 0;
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term->sixel.param_idx = 0;
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term->sixel.param = 0;
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switch (c) {
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case '#': term->sixel.state = SIXEL_COLOR; break;
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case ';': term->sixel.state = SIXEL_COLOR_SPEC; break;
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default: term->sixel.state = SIXEL_SIXEL; sixel_sixel(term, c); break;
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}
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}
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}
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static void
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sixel_color_spec(struct terminal *term, uint8_t c)
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{
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if (c >= '0' && c <= '9') {
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term->sixel.param *= 10;
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term->sixel.param += c - '0';
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} else {
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if (term->sixel.param_idx < sizeof(term->sixel.params) / sizeof(term->sixel.params[0]))
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term->sixel.params[term->sixel.param_idx++] = term->sixel.param;
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term->sixel.param = 0;
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if (c != ';') {
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unsigned format = term->sixel.params[0];
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unsigned c1 = term->sixel.params[1];
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unsigned c2 = term->sixel.params[2];
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unsigned c3 = term->sixel.params[3];
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if (format == 1) {
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assert(false && "HLS color format not implemented");
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} else {
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uint8_t r = 255 * c1 / 100;
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uint8_t g = 255 * c2 / 100;
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uint8_t b = 255 * c3 / 100;
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LOG_DBG("setting palette #%d = RGB %hhu/%hhu/%hhu",
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term->sixel.color_idx, r, g, b);
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term->sixel.palette[term->sixel.color_idx] = r << 16 | g << 8 | b;
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}
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}
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switch (c) {
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case '#': term->sixel.state = SIXEL_COLOR; break;
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case ';': term->sixel.state = SIXEL_COLOR_SPEC; break;
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default: term->sixel.state = SIXEL_SIXEL; sixel_sixel(term, c); break;
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}
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}
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}
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void
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sixel_put(struct terminal *term, uint8_t c)
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{
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count++;
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switch (c) {
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case ' ': return;
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case '\n': return;
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case '\r': return;
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}
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switch (term->sixel.state) {
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case SIXEL_SIXEL: sixel_sixel(term, c); break;
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case SIXEL_REPEAT: sixel_repeat(term, c); break;
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case SIXEL_RASTER: sixel_raster(term, c); break;
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case SIXEL_COLOR: sixel_color(term, c); break;
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case SIXEL_COLOR_SPEC: sixel_color_spec(term, c); break;
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}
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}
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