444 lines
12 KiB
C
444 lines
12 KiB
C
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/*
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* lws abstract display
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*
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* Copyright (C) 2019 - 2022 Andy Green <andy@warmcat.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include <private-lib-core.h>
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static void
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sul_autodim_cb(lws_sorted_usec_list_t *sul)
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{
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lws_display_state_t *lds = lws_container_of(sul, lws_display_state_t,
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sul_autodim);
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int next_ms = -1;
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/* we fire both to dim and to blank... if already in dim state, blank */
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switch (lds->state) {
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case LWSDISPS_BECOMING_ACTIVE:
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lws_display_state_set_brightness(lds, lds->disp->bl_active);
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lds->state = LWSDISPS_ACTIVE;
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next_ms = lds->autodim_ms;
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break;
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case LWSDISPS_ACTIVE:
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/* active -> autodimmed */
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lds->state = LWSDISPS_AUTODIMMED;
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next_ms = lds->off_ms;
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lws_display_state_set_brightness(lds, lds->disp->bl_dim);
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break;
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case LWSDISPS_AUTODIMMED:
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/* dimmed -> OFF */
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lws_display_state_set_brightness(lds, &lws_pwmseq_static_off);
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lds->state = LWSDISPS_GOING_OFF;
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next_ms = 600;
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break;
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case LWSDISPS_GOING_OFF:
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/* off dimming completed, actual display OFF */
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lws_display_state_off(lds);
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return;
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default:
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return;
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}
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if (next_ms >= 0)
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lws_sul_schedule(lds->ctx, 0, &lds->sul_autodim, sul_autodim_cb,
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next_ms * LWS_US_PER_MS);
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}
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void
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lws_display_state_init(lws_display_state_t *lds, struct lws_context *ctx,
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int dim_ms, int off_ms, struct lws_led_state *bl_lcs,
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const lws_display_t *disp)
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{
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memset(lds, 0, sizeof(*lds));
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lds->disp = disp;
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lds->ctx = ctx;
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lds->autodim_ms = dim_ms;
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lds->off_ms = off_ms;
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lds->bl_lcs = bl_lcs;
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lds->state = LWSDISPS_OFF;
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if (lds->bl_lcs)
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lws_led_transition(lds->bl_lcs, "backlight", &lws_pwmseq_static_off,
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&lws_pwmseq_static_on);
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disp->init(lds);
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}
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void
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lws_display_state_set_brightness(lws_display_state_t *lds,
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const lws_led_sequence_def_t *pwmseq)
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{
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if (lds->bl_lcs)
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lws_led_transition(lds->bl_lcs, "backlight", pwmseq,
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lds->disp->bl_transition);
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}
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void
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lws_display_state_active(lws_display_state_t *lds)
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{
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int waiting_ms;
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if (lds->state == LWSDISPS_OFF) {
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/* power us up */
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lds->disp->power(lds, 1);
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lds->state = LWSDISPS_BECOMING_ACTIVE;
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waiting_ms = lds->disp->latency_wake_ms;
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} else {
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if (lds->state != LWSDISPS_ACTIVE && lds->bl_lcs)
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lws_display_state_set_brightness(lds,
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lds->disp->bl_active);
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lds->state = LWSDISPS_ACTIVE;
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waiting_ms = lds->autodim_ms;
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}
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/* reset the autodim timer */
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if (waiting_ms >= 0)
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lws_sul_schedule(lds->ctx, 0, &lds->sul_autodim, sul_autodim_cb,
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waiting_ms * LWS_US_PER_MS);
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}
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void
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lws_display_state_off(lws_display_state_t *lds)
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{
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/* if no control over backlight, don't bother power down display
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* since it would continue to emit, just show all-white or whatever */
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if (lds->bl_lcs)
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lds->disp->power(lds, 0);
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lws_sul_cancel(&lds->sul_autodim);
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lds->state = LWSDISPS_OFF;
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}
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int
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lws_display_alloc_diffusion(const lws_surface_info_t *ic, lws_surface_error_t **se)
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{
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size_t size, gsize = ic->greyscale ? sizeof(lws_greyscale_error_t) :
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sizeof(lws_colour_error_t), by;
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if (*se)
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return 0;
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/* defer creation of dlo's 2px-high dlo-width, 2 bytespp or 6 bytespp
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* error diffusion buffer */
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by = ((ic->wh_px[0].whole + 15) / 8) * 8;
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size = gsize * 2u * (unsigned int)by;
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lwsl_info("%s: alloc'd %u for width %d\n", __func__, (unsigned int)size,
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(int)ic->wh_px[0].whole);
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se[0] = lws_zalloc(size, __func__);
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if (!se[0])
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return 1;
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se[1] = (lws_surface_error_t *)(((uint8_t *)se[0]) + (size / 2));
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return 0;
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}
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static void
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dist_err_grey(const lws_greyscale_error_t *in, lws_greyscale_error_t *out,
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int sixteenths)
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{
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out->rgb[0] = (int16_t)(out->rgb[0] +
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(int16_t)((sixteenths * in->rgb[0]) / 16));
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}
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static void
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dist_err_col(const lws_colour_error_t *in, lws_colour_error_t *out,
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int sixteenths)
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{
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out->rgb[0] = (int16_t)(out->rgb[0] +
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(int16_t)((sixteenths * in->rgb[0]) / 16));
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out->rgb[1] = (int16_t)(out->rgb[1] +
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(int16_t)((sixteenths * in->rgb[1]) / 16));
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out->rgb[2] = (int16_t)(out->rgb[2] +
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(int16_t)((sixteenths * in->rgb[2]) / 16));
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}
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void
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dist_err_floyd_steinberg_grey(int n, int width, lws_greyscale_error_t *gedl_this,
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lws_greyscale_error_t *gedl_next)
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{
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if (n < width - 1) {
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dist_err_grey(&gedl_this[n], &gedl_this[n + 1], 7);
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dist_err_grey(&gedl_this[n], &gedl_next[n + 1], 1);
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}
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if (n)
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dist_err_grey(&gedl_this[n], &gedl_next[n - 1], 3);
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dist_err_grey(&gedl_this[n], &gedl_next[n], 5);
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gedl_this[n].rgb[0] = 0;
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}
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void
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dist_err_floyd_steinberg_col(int n, int width, lws_colour_error_t *edl_this,
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lws_colour_error_t *edl_next)
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{
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if (n < width - 1) {
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dist_err_col(&edl_this[n], &edl_this[n + 1], 7);
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dist_err_col(&edl_this[n], &edl_next[n + 1], 1);
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}
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if (n)
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dist_err_col(&edl_this[n], &edl_next[n - 1], 3);
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dist_err_col(&edl_this[n], &edl_next[n], 5);
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edl_this[n].rgb[0] = 0;
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edl_this[n].rgb[1] = 0;
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edl_this[n].rgb[2] = 0;
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}
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/*
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* #include <stdio.h>
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* #include <math.h>
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*
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* void
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* main(void)
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* {
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* int n;
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*
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* for (n = 0; n < 256; n++) {
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* double d = (double)n / 255.0;
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*
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* printf("0x%02X, ", (unsigned int)(pow(d, (2.2)) * 255));
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* }
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*
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* }
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*/
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static const uint8_t gamma2_2[] = {
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01,
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0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02,
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0x02, 0x02, 0x03, 0x03, 0x03, 0x03, 0x03, 0x04,
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0x04, 0x04, 0x04, 0x05, 0x05, 0x05, 0x05, 0x06,
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0x06, 0x06, 0x07, 0x07, 0x07, 0x08, 0x08, 0x08,
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0x09, 0x09, 0x09, 0x0A, 0x0A, 0x0A, 0x0B, 0x0B,
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0x0C, 0x0C, 0x0D, 0x0D, 0x0D, 0x0E, 0x0E, 0x0F,
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0x0F, 0x10, 0x10, 0x11, 0x11, 0x12, 0x12, 0x13,
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0x13, 0x14, 0x15, 0x15, 0x16, 0x16, 0x17, 0x17,
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0x18, 0x19, 0x19, 0x1A, 0x1B, 0x1B, 0x1C, 0x1D,
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0x1D, 0x1E, 0x1F, 0x1F, 0x20, 0x21, 0x21, 0x22,
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0x23, 0x24, 0x24, 0x25, 0x26, 0x27, 0x28, 0x28,
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0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2D, 0x2E, 0x2F,
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0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
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0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E,
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0x3F, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
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0x48, 0x49, 0x4A, 0x4B, 0x4D, 0x4E, 0x4F, 0x50,
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0x51, 0x52, 0x54, 0x55, 0x56, 0x57, 0x58, 0x5A,
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0x5B, 0x5C, 0x5D, 0x5F, 0x60, 0x61, 0x63, 0x64,
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0x65, 0x67, 0x68, 0x69, 0x6B, 0x6C, 0x6D, 0x6F,
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0x70, 0x72, 0x73, 0x75, 0x76, 0x77, 0x79, 0x7A,
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0x7C, 0x7D, 0x7F, 0x80, 0x82, 0x83, 0x85, 0x87,
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0x88, 0x8A, 0x8B, 0x8D, 0x8E, 0x90, 0x92, 0x93,
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0x95, 0x97, 0x98, 0x9A, 0x9C, 0x9D, 0x9F, 0xA1,
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0xA2, 0xA4, 0xA6, 0xA8, 0xA9, 0xAB, 0xAD, 0xAF,
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0xB0, 0xB2, 0xB4, 0xB6, 0xB8, 0xBA, 0xBB, 0xBD,
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0xBF, 0xC1, 0xC3, 0xC5, 0xC7, 0xC9, 0xCB, 0xCD,
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0xCF, 0xD1, 0xD3, 0xD5, 0xD7, 0xD9, 0xDB, 0xDD,
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0xDF, 0xE1, 0xE3, 0xE5, 0xE7, 0xE9, 0xEB, 0xED,
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0xEF, 0xF1, 0xF4, 0xF6, 0xF8, 0xFA, 0xFC, 0xFF
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};
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lws_display_palette_idx_t
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lws_display_palettize_grey(const lws_surface_info_t *ic,
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const lws_display_colour_t *palette, size_t pdepth,
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lws_display_colour_t c, lws_greyscale_error_t *ectx)
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{
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int best = 0x7fffffff, best_idx = 0;
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lws_colour_error_t da, d, ea;
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int sum, y;
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size_t n;
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/* put the most desirable colour (adjusted for existing error) in d */
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d.rgb[0] = (int)gamma2_2[LWSDC_R(c)];
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da.rgb[0] = d.rgb[0] + ectx->rgb[0];
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if (da.rgb[0] < 0)
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da.rgb[0] = 0;
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if (da.rgb[0] > 255)
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da.rgb[0] = 255;
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if (ic->type == LWSSURF_565) {
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y = d.rgb[0] >> 3;
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ectx->rgb[0] = (int16_t)((int)da.rgb[0] - y);
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return (lws_display_palette_idx_t)y;
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}
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/*
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* Choose a palette colour considering the error diffusion adjustments
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*/
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for (n = 0; n < pdepth; n++) {
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y = LWSDC_ALPHA(palette[n]);
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ea.rgb[0] = (int16_t)((int)da.rgb[0] - (int)(LWSDC_R(palette[n])));
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sum = ea.rgb[0] < 0 ? -ea.rgb[0] : ea.rgb[0];
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if (sum < best) {
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best_idx = (int)n;
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best = sum;
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}
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}
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/* report the error between the unadjusted colour and what we chose */
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ectx->rgb[0] = (int16_t)((int)da.rgb[0] - (int)(LWSDC_R(palette[best_idx])));
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|
|
||
|
|
return (lws_display_palette_idx_t)best_idx;
|
||
|
|
}
|
||
|
|
/*
|
||
|
|
* For error disffusion, it's better to use YUV and prioritize reducing error
|
||
|
|
* in Y (lumience)
|
||
|
|
*/
|
||
|
|
#if 0
|
||
|
|
static void
|
||
|
|
rgb_to_yuv(uint8_t *yuv, const uint8_t *rgb)
|
||
|
|
{
|
||
|
|
yuv[0] = 16 + ((257 * rgb[0]) / 1000) + ((504 * rgb[1]) / 1000) +
|
||
|
|
((98 * rgb[2]) / 1000);
|
||
|
|
yuv[1] = 128 - ((148 * rgb[0]) / 1000) - ((291 * rgb[1]) / 1000) +
|
||
|
|
((439 * rgb[2]) / 1000);
|
||
|
|
yuv[2] = 128 + ((439 * rgb[0]) / 1000) - ((368 * rgb[1]) / 1000) -
|
||
|
|
((71 * rgb[2]) / 1000);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
yuv_to_rgb(uint8_t *rgb, const uint8_t *_yuv)
|
||
|
|
{
|
||
|
|
unsigned int yuv[3];
|
||
|
|
|
||
|
|
yuv[0] = _yuv[0] - 16;
|
||
|
|
yuv[1] = _yuv[1] - 128;
|
||
|
|
yuv[2] = _yuv[2] - 128;
|
||
|
|
|
||
|
|
rgb[0] = ((1164 * yuv[0]) / 1000) + ((1596 * yuv[2]) / 1000);
|
||
|
|
rgb[1] = ((1164 * yuv[0]) / 1090) - ((392 * yuv[1]) / 1000) -
|
||
|
|
((813 * yuv[2]) / 1000);
|
||
|
|
rgb[2] = ((1164 * yuv[0]) / 1000) + ((2017 * yuv[1]) / 1000);
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
lws_display_palette_idx_t
|
||
|
|
lws_display_palettize_col(const lws_surface_info_t *ic,
|
||
|
|
const lws_display_colour_t *palette, size_t pdepth,
|
||
|
|
lws_display_colour_t c, lws_colour_error_t *ectx)
|
||
|
|
{
|
||
|
|
int best = 0x7fffffff, best_idx = 0, yd;
|
||
|
|
lws_colour_error_t da, d;
|
||
|
|
uint8_t ya[3];
|
||
|
|
size_t n;
|
||
|
|
int y, ch;
|
||
|
|
|
||
|
|
/* put the most desirable colour (adjusted for existing error) in d */
|
||
|
|
|
||
|
|
d.rgb[0] = (int)gamma2_2[LWSDC_R(c)];
|
||
|
|
da.rgb[0] = d.rgb[0] + ectx->rgb[0];
|
||
|
|
if (da.rgb[0] < 0)
|
||
|
|
da.rgb[0] = 0;
|
||
|
|
if (da.rgb[0] > 255)
|
||
|
|
da.rgb[0] = 255;
|
||
|
|
yd = da.rgb[0];
|
||
|
|
d.rgb[1] = (int)gamma2_2[LWSDC_G(c)];
|
||
|
|
d.rgb[2] = (int)gamma2_2[LWSDC_B(c)];
|
||
|
|
da.rgb[1] = d.rgb[1] + ectx->rgb[1];
|
||
|
|
if (da.rgb[1] < 0)
|
||
|
|
da.rgb[1] = 0;
|
||
|
|
if (da.rgb[1] > 255)
|
||
|
|
da.rgb[1] = 255;
|
||
|
|
da.rgb[2] = d.rgb[2] + ectx->rgb[2];
|
||
|
|
if (da.rgb[2] < 0)
|
||
|
|
da.rgb[2] = 0;
|
||
|
|
if (da.rgb[2] > 255)
|
||
|
|
da.rgb[2] = 255;
|
||
|
|
|
||
|
|
yd = RGB_TO_Y(da.rgb[0], da.rgb[1], da.rgb[2]);
|
||
|
|
|
||
|
|
if (ic->type == LWSSURF_565) {
|
||
|
|
ya[0] = d.rgb[0] >> 3;
|
||
|
|
ectx->rgb[0] = (int16_t)((int)da.rgb[0] - (ya[0] << 3));
|
||
|
|
ya[1] = d.rgb[1] >> 2;
|
||
|
|
ectx->rgb[1] = (int16_t)((int)da.rgb[1] - (ya[1] << 2));
|
||
|
|
ya[2] = d.rgb[2] >> 3;
|
||
|
|
ectx->rgb[2] = (int16_t)((int)da.rgb[2] - (ya[2] << 3));
|
||
|
|
|
||
|
|
return (lws_display_palette_idx_t)((ya[0] << 11) | (ya[1] << 5) | (ya[2]));
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Choose a palette colour considering the error diffusion adjustments,
|
||
|
|
* separately choose the best Y match and the best RGB match
|
||
|
|
*/
|
||
|
|
|
||
|
|
for (n = 0; n < pdepth; n++) {
|
||
|
|
lws_colour_error_t ea;
|
||
|
|
int sum;
|
||
|
|
|
||
|
|
y = LWSDC_ALPHA(palette[n]);
|
||
|
|
|
||
|
|
ea.rgb[0] = (int16_t)((int)da.rgb[0] - (int)(LWSDC_R(palette[n])));
|
||
|
|
ea.rgb[1] = (int16_t)((int)da.rgb[1] - (int)(LWSDC_G(palette[n])));
|
||
|
|
ea.rgb[2] = (int16_t)((int)da.rgb[2] - (int)(LWSDC_B(palette[n])));
|
||
|
|
|
||
|
|
/* Best considering luma match */
|
||
|
|
|
||
|
|
sum = (yd > y ? (yd - y) : (y - yd));
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Best considering RGB matching
|
||
|
|
*/
|
||
|
|
|
||
|
|
sum += ((ea.rgb[0] < 0 ? -ea.rgb[0] : ea.rgb[0]) +
|
||
|
|
(ea.rgb[1] < 0 ? -ea.rgb[1] : ea.rgb[1]) +
|
||
|
|
(ea.rgb[2] < 0 ? -ea.rgb[2] : ea.rgb[2]));
|
||
|
|
|
||
|
|
if (sum < best) {
|
||
|
|
best_idx = (int)n;
|
||
|
|
best = sum;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
ch = best_idx;
|
||
|
|
|
||
|
|
/* report the error between the adjusted colour and what we chose */
|
||
|
|
|
||
|
|
ectx->rgb[0] = (int16_t)((int)da.rgb[0] - (int)(LWSDC_R(palette[ch])));
|
||
|
|
ectx->rgb[1] = (int16_t)((int)da.rgb[1] - (int)(LWSDC_G(palette[ch])));
|
||
|
|
ectx->rgb[2] = (int16_t)((int)da.rgb[2] - (int)(LWSDC_B(palette[ch])));
|
||
|
|
|
||
|
|
return (lws_display_palette_idx_t)ch;
|
||
|
|
}
|
||
|
|
|