t/esp32_sd_lcd_image_viewer
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bezier and power level based stepping of backlight was not possible, used esp lcdc to fade the backlight off and on

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This commit is contained in:
Timo Niemann
2026-07-02 12:00:32 +02:00
parent 28e6d42f05
commit 3c086037f6
5 changed files with 61 additions and 9 deletions
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main/lcd/ui_image_browser.c
+14 -1
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@@ -15,6 +15,7 @@
#include "lcd/ui_internal.h"
#include "lcd/ui_log.h"
#include "sd/sd.h"
#include "lcd/lcd.h"
#define UI_IMAGE_PATH_PREFIX "A:/sdcard/"
#define UI_IMAGE_PATH_MAX_LENGTH 160
@@ -349,6 +350,7 @@ static bool ui_image_browser_display_prefetched(void){
/* Warm up the next image so the following switch is instant too. */
ui_prefetch_next(index, slot);
return true;
}
@@ -395,11 +397,22 @@ static void ui_image_browser_load_via_path(void){
static void ui_image_browser_display_current(void){
if(image_widget == NULL || image_browser_names == NULL || image_browser_image_count == 0) return;
if(ui_image_browser_display_prefetched()) return;
ESP_LOGI(TAG, "Backlight sweep: turning off backlight");
ui_log_append("Backlight sweep: turning off backlight");
lcd_backlight_set(0);
if(ui_image_browser_display_prefetched()) goto done;
ESP_LOGW(TAG, "Prefetched image unavailable: falling back to on-demand decoding");
ui_log_append("Prefetched image unavailable: falling back to on-demand decoding");
/* Prefetch unavailable or render failed: fall back to on-demand decoding. */
visible_slot = -1;
ui_image_browser_load_via_path();
done:
ESP_LOGI(TAG, "Backlight sweep: turning on backlight");
ui_log_append("Backlight sweep: turning on backlight");
lcd_backlight_set(255);
}
void ui_image_browser_build_view(lv_obj_t *screen){