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7d315d7bf9
When P2=1, empty pixels are transparent. This patch also changes the behavior of P2=0|2, from setting empty pixels to the default background color, to instead use the *current* background color. To implement this, a couple of changes are needed: * Sixel pixels always use alpha=1.0, except for *empty* cells when P2=1 (i.e. transparent pixels). * The renderer draws sixels with the OVER operator, instead of the SRC operator. * The renderer *must* now render the cells beneath the sixel. As an optimization, this is only done for sixels where P2=1. I.e. for fully opaque sixels, there’s no need to render the cells beneath. The sixel renderer isn’t yet hooked into the multi-threaded renderer. This means *rows* (not just the cells) beneath maybe-transparent sixels are rendered single-threaded. Closes #391.
117 lines
2.9 KiB
C
117 lines
2.9 KiB
C
#include "dcs.h"
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#define LOG_MODULE "dcs"
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#define LOG_ENABLE_DBG 0
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#include "log.h"
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#include "sixel.h"
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#include "vt.h"
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static void
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bsu(struct terminal *term)
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{
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/* https://gitlab.com/gnachman/iterm2/-/wikis/synchronized-updates-spec */
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LOG_DBG("untested: BSU - Begin Synchronized Update (params: %.*s)",
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(int)term->vt.dcs.idx, term->vt.dcs.data);
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term_enable_app_sync_updates(term);
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}
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static void
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esu(struct terminal *term)
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{
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/* https://gitlab.com/gnachman/iterm2/-/wikis/synchronized-updates-spec */
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LOG_DBG("untested: ESU - End Synchronized Update (params: %.*s)",
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(int)term->vt.dcs.idx, term->vt.dcs.data);
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term_disable_app_sync_updates(term);
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}
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void
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dcs_hook(struct terminal *term, uint8_t final)
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{
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LOG_DBG("hook: %c (intermediate(s): %.2s, param=%d)", final,
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(const char *)&term->vt.private, vt_param_get(term, 0, 0));
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xassert(term->vt.dcs.data == NULL);
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xassert(term->vt.dcs.size == 0);
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xassert(term->vt.dcs.put_handler == NULL);
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xassert(term->vt.dcs.unhook_handler == NULL);
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switch (term->vt.private) {
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case 0:
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switch (final) {
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case 'q': {
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int p1 = vt_param_get(term, 0, 0);
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int p2 = vt_param_get(term, 1,0);
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int p3 = vt_param_get(term, 2, 0);
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sixel_init(term, p1, p2, p3);
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term->vt.dcs.put_handler = &sixel_put;
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term->vt.dcs.unhook_handler = &sixel_unhook;
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break;
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}
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}
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break;
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case '=':
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switch (final) {
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case 's':
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switch (vt_param_get(term, 0, 0)) {
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case 1: term->vt.dcs.unhook_handler = &bsu; return;
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case 2: term->vt.dcs.unhook_handler = &esu; return;
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}
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break;
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}
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break;
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}
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}
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static bool
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ensure_size(struct terminal *term, size_t required_size)
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{
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if (required_size <= term->vt.dcs.size)
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return true;
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size_t new_size = (required_size + 127) / 128 * 128;
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xassert(new_size > 0);
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uint8_t *new_data = realloc(term->vt.dcs.data, new_size);
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if (new_data == NULL) {
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LOG_ERRNO("failed to increase size of DCS buffer");
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return false;
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}
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term->vt.dcs.data = new_data;
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term->vt.dcs.size = new_size;
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return true;
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}
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void
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dcs_put(struct terminal *term, uint8_t c)
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{
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LOG_DBG("PUT: %c", c);
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if (term->vt.dcs.put_handler != NULL)
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term->vt.dcs.put_handler(term, c);
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else {
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if (!ensure_size(term, term->vt.dcs.idx + 1))
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return;
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term->vt.dcs.data[term->vt.dcs.idx++] = c;
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}
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}
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void
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dcs_unhook(struct terminal *term)
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{
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if (term->vt.dcs.unhook_handler != NULL)
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term->vt.dcs.unhook_handler(term);
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term->vt.dcs.unhook_handler = NULL;
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term->vt.dcs.put_handler = NULL;
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free(term->vt.dcs.data);
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term->vt.dcs.data = NULL;
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term->vt.dcs.size = 0;
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term->vt.dcs.idx = 0;
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}
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