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Grayscale quantization and fixing some defaults to support rgb565

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This commit is contained in:
Patedam
2026-03-15 22:01:45 -04:00
parent 7f296f9857
commit 2c79be36ef
5 changed files with 368 additions and 288 deletions
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64
Provider/main/api/devices/screen_image.cpp
View File

@@ -91,7 +91,8 @@ internal esp_err_t api_devices_screen_image_handler(httpd_req_t *req)
// 1. Prepare the XML payload
const char *xml_to_register = NULL;
static char xml_buffer[DEVICE_XML_MAX + 100]; // static buffer to avoid stack overflow
static char
xml_buffer[DEVICE_XML_MAX + 100]; // static buffer to avoid stack overflow
if (dev->xml_layout[0] == '\0')
{
@@ -106,16 +107,6 @@ internal esp_err_t api_devices_screen_image_handler(httpd_req_t *req)
ESP_LOGI(kTagDeviceScreenImage,
"XML already contains <screen>, passing directly to parser.");
}
else
{
// Backwards compatibility for early setups - wrap it in screen and view
snprintf(xml_buffer, sizeof(xml_buffer),
"<screen>\n<view name=\"current_device\" width=\"100%%\" height=\"100%%\">\n%s\n</view>\n</screen>",
dev->xml_layout);
xml_to_register = xml_buffer;
ESP_LOGI(kTagDeviceScreenImage,
"Legacy XML without <screen> detected. Wrapped automatically.");
}
// 2. Register the XML payload as a component
lv_result_t res =
@@ -131,7 +122,8 @@ internal esp_err_t api_devices_screen_image_handler(httpd_req_t *req)
if (new_scr)
{
// We must load this newly created screen to make it active before rendering
// We must load this newly created screen to make it active before
// rendering
lv_screen_load(new_scr);
scr = new_scr; // Update local pointer since active screen changed
render_success = true;
@@ -175,14 +167,13 @@ internal esp_err_t api_devices_screen_image_handler(httpd_req_t *req)
uint32_t width = CONFIG_CALENDINK_DISPLAY_WIDTH;
uint32_t height = CONFIG_CALENDINK_DISPLAY_HEIGHT;
// Handle stride != width
uint8_t *packed_data = (uint8_t *)draw_buf->data;
bool needs_free = false;
if (draw_buf->header.stride != width)
// Allocate bounding memory for quantizing RGB565 buffer into tightly packed
// 8-bit PNG data.
uint8_t *packed_data =
(uint8_t *)heap_caps_malloc(width * height, MALLOC_CAP_SPIRAM);
if (!packed_data)
{
packed_data =
(uint8_t *)heap_caps_malloc(width * height, MALLOC_CAP_SPIRAM);
packed_data = (uint8_t *)malloc(width * height);
if (!packed_data)
{
xSemaphoreGive(g_LvglMutex);
@@ -191,11 +182,33 @@ internal esp_err_t api_devices_screen_image_handler(httpd_req_t *req)
"Out of memory");
return ESP_FAIL;
}
needs_free = true;
for (uint32_t y = 0; y < height; ++y)
}
// LVGL renders into RGB565 (2 bytes per pixel).
// Parse pixels, extract luminance, and quantize to 4 levels (0, 85, 170, 255).
for (uint32_t y = 0; y < height; ++y)
{
const uint16_t *src_row = (const uint16_t *)((const uint8_t *)draw_buf->data + (y * draw_buf->header.stride));
uint8_t *dst_row = packed_data + (y * width);
for (uint32_t x = 0; x < width; ++x)
{
memcpy(packed_data + (y * width),
(uint8_t *)draw_buf->data + (y * draw_buf->header.stride), width);
uint16_t c = src_row[x];
// Expand 5/6/5 components
uint8_t r_5 = (c >> 11) & 0x1F;
uint8_t g_6 = (c >> 5) & 0x3F;
uint8_t b_5 = c & 0x1F;
// Unpack to 8-bit true values
uint8_t r = (r_5 << 3) | (r_5 >> 2);
uint8_t g = (g_6 << 2) | (g_6 >> 4);
uint8_t b = (b_5 << 3) | (b_5 >> 2);
// Simple luminance
uint8_t lum = (r * 77 + g * 150 + b * 29) >> 8;
// 4-level linear quantization (0, 85, 170, 255)
dst_row[x] = (lum >> 6) * 85;
}
}
@@ -210,10 +223,7 @@ internal esp_err_t api_devices_screen_image_handler(httpd_req_t *req)
unsigned error = lodepng_encode_memory(&png, &pngsize, packed_data, width,
height, LCT_GREY, 8);
if (needs_free)
{
free(packed_data);
}
free(packed_data);
xSemaphoreGive(g_LvglMutex);

208
Provider/main/api/display/image.cpp
View File

@@ -1,113 +1,145 @@
#include "../../lv_setup.hpp"
#include "../../lodepng/lodepng.h"
#include "../../lodepng_alloc.hpp"
#include "../../lv_setup.hpp"
#include "esp_heap_caps.h"
#include "esp_http_server.h"
#include "esp_log.h"
#include "esp_heap_caps.h"
#include "esp_random.h"
#include "lvgl.h"
#include <string.h>
#include "../../lodepng_alloc.hpp"
internal const char *kTagDisplayImage = "API_DISPLAY_IMAGE";
internal esp_err_t api_display_image_handler(httpd_req_t *req)
{
httpd_resp_set_hdr(req, "Access-Control-Allow-Origin", "*");
// We are generating PNG on the fly, don't let it be cached locally immediately
httpd_resp_set_hdr(req, "Cache-Control", "no-cache, no-store, must-revalidate");
httpd_resp_set_type(req, "image/png");
httpd_resp_set_hdr(req, "Access-Control-Allow-Origin", "*");
if (xSemaphoreTake(g_LvglMutex, pdMS_TO_TICKS(5000)) != pdTRUE)
{
ESP_LOGE(kTagDisplayImage, "Failed to get LVGL mutex");
httpd_resp_send_err(req, HTTPD_500_INTERNAL_SERVER_ERROR, "LVGL busy");
return ESP_FAIL;
}
// We are generating PNG on the fly, don't let it be cached locally
// immediately
httpd_resp_set_hdr(req, "Cache-Control",
"no-cache, no-store, must-revalidate");
httpd_resp_set_type(req, "image/png");
// Change the background color securely to a random grayscale value
// esp_random() returns 32 bits, we just take the lowest 8.
uint8_t rand_gray = esp_random() & 0xFF;
lv_obj_t* active_screen = lv_screen_active();
lv_obj_set_style_bg_color(active_screen, lv_color_make(rand_gray, rand_gray, rand_gray), LV_PART_MAIN);
if (xSemaphoreTake(g_LvglMutex, pdMS_TO_TICKS(5000)) != pdTRUE)
{
ESP_LOGE(kTagDisplayImage, "Failed to get LVGL mutex");
httpd_resp_send_err(req, HTTPD_500_INTERNAL_SERVER_ERROR, "LVGL busy");
return ESP_FAIL;
}
// Force a screen refresh to get the latest rendered frame
lv_refr_now(g_LvglDisplay);
// Change the background color securely to a random grayscale value
// esp_random() returns 32 bits, we just take the lowest 8.
uint8_t rand_gray = esp_random() & 0xFF;
lv_obj_t *active_screen = lv_screen_active();
// lv_obj_set_style_bg_color(active_screen, lv_color_make(rand_gray,
// rand_gray, rand_gray), LV_PART_MAIN);
lv_draw_buf_t *draw_buf = lv_display_get_buf_active(g_LvglDisplay);
if (!draw_buf)
{
xSemaphoreGive(g_LvglMutex);
ESP_LOGE(kTagDisplayImage, "No active draw buffer available");
httpd_resp_send_err(req, HTTPD_500_INTERNAL_SERVER_ERROR, "Display uninitialized");
return ESP_FAIL;
}
uint32_t width = CONFIG_CALENDINK_DISPLAY_WIDTH;
uint32_t height = CONFIG_CALENDINK_DISPLAY_HEIGHT;
// LodePNG expects tightly packed data without stride padding.
// Ensure we copy the data if stride differs from width.
uint8_t *packed_data = (uint8_t *)draw_buf->data;
bool needs_free = false;
if (draw_buf->header.stride != width)
{
ESP_LOGI(kTagDisplayImage, "Stride %lu differs from width %lu. Repacking buffer...", draw_buf->header.stride, width);
packed_data = (uint8_t *)heap_caps_malloc(width * height, MALLOC_CAP_SPIRAM);
if (!packed_data)
{
xSemaphoreGive(g_LvglMutex);
ESP_LOGE(kTagDisplayImage, "Failed to allocate packed buffer in PSRAM");
httpd_resp_send_err(req, HTTPD_500_INTERNAL_SERVER_ERROR, "Out of memory");
return ESP_FAIL;
}
needs_free = true;
for (uint32_t y = 0; y < height; ++y)
{
memcpy(packed_data + (y * width), (uint8_t *)draw_buf->data + (y * draw_buf->header.stride), width);
}
}
// Convert LVGL 8-bit L8 buffer to 8-bit grayscale PNG using LodePNG.
// LCT_GREY = 0, bitdepth = 8
unsigned char *png = nullptr;
size_t pngsize = 0;
// We are about to start a huge memory operation inside LodePNG.
// We reset our 2MB PSRAM bump allocator to 0 bytes used.
lodepng_allocator_reset();
ESP_LOGI(kTagDisplayImage, "Encoding %lux%lu frame to PNG...", width, height);
unsigned error = lodepng_encode_memory(&png, &pngsize, packed_data, width, height, LCT_GREY, 8);
if (needs_free)
{
free(packed_data);
}
// Force a screen refresh to get the latest rendered frame
lv_refr_now(g_LvglDisplay);
lv_draw_buf_t *draw_buf = lv_display_get_buf_active(g_LvglDisplay);
if (!draw_buf)
{
xSemaphoreGive(g_LvglMutex);
ESP_LOGE(kTagDisplayImage, "No active draw buffer available");
httpd_resp_send_err(req, HTTPD_500_INTERNAL_SERVER_ERROR,
"Display uninitialized");
return ESP_FAIL;
}
if (error)
uint32_t width = CONFIG_CALENDINK_DISPLAY_WIDTH;
uint32_t height = CONFIG_CALENDINK_DISPLAY_HEIGHT;
// We allocate a new buffer for the tightly packed 8-bit PNG grayscale data.
// Converting RGB565 frame to 4-level grayscale (quantized to 0, 85, 170, 255).
uint8_t *packed_data =
(uint8_t *)heap_caps_malloc(width * height, MALLOC_CAP_SPIRAM);
if (!packed_data)
{
packed_data = (uint8_t *)malloc(width * height); // Fallback
if (!packed_data)
{
ESP_LOGE(kTagDisplayImage, "PNG encoding error %u: %s", error, lodepng_error_text(error));
httpd_resp_send_err(req, HTTPD_500_INTERNAL_SERVER_ERROR, "PNG generation failed");
return ESP_FAIL;
xSemaphoreGive(g_LvglMutex);
ESP_LOGE(kTagDisplayImage, "Failed to allocate packed buffer");
httpd_resp_send_err(req, HTTPD_500_INTERNAL_SERVER_ERROR,
"Out of memory");
return ESP_FAIL;
}
}
ESP_LOGI(kTagDisplayImage, "Prepared PNG, size: %zu bytes. Sending to client...", pngsize);
esp_err_t res = httpd_resp_send(req, (const char *)png, pngsize);
// LVGL renders into RGB565 (2 bytes per pixel).
// Iterating to create an 8-bit grayscale PNG using 4 specific values.
for (uint32_t y = 0; y < height; ++y)
{
const uint16_t *src_row =
(const uint16_t *)((const uint8_t *)draw_buf->data +
(y * draw_buf->header.stride));
uint8_t *dst_row = packed_data + (y * width);
// No need to free(png) because it is managed by our bump allocator
// which automatically resets the entire 2MB buffer to 0 next time
// lodepng_allocator_reset() is called.
for (uint32_t x = 0; x < width; ++x)
{
uint16_t c = src_row[x];
// Note: LVGL may use swapped bytes for SPI rendering depending on config,
// but in memory RGB565 is standard if no SWAP is active. Usually standard
// RGB565 format: R(5) G(6) B(5)
uint8_t r_5 = (c >> 11) & 0x1F;
uint8_t g_6 = (c >> 5) & 0x3F;
uint8_t b_5 = c & 0x1F;
return res;
// Expand to 8 bits
uint8_t r = (r_5 << 3) | (r_5 >> 2);
uint8_t g = (g_6 << 2) | (g_6 >> 4);
uint8_t b = (b_5 << 3) | (b_5 >> 2);
// Simple luminance calculation (fast)
uint8_t lum = (r * 77 + g * 150 + b * 29) >> 8;
// Quantize to 4 levels (0..3)
uint8_t level = lum >> 6;
// Expand level back to 8-bit for PNG: 0, 85, 170, 255
dst_row[x] = level * 85;
}
}
// Convert LVGL 8-bit L8 buffer to 8-bit grayscale PNG using LodePNG.
// LCT_GREY = 0, bitdepth = 8
unsigned char *png = nullptr;
size_t pngsize = 0;
// We are about to start a huge memory operation inside LodePNG.
// We reset our 3MB PSRAM bump allocator to 0 bytes used.
lodepng_allocator_reset();
ESP_LOGI(kTagDisplayImage, "Encoding %lux%lu frame to PNG...", width, height);
unsigned error = lodepng_encode_memory(&png, &pngsize, packed_data, width,
height, LCT_GREY, 8);
free(packed_data);
xSemaphoreGive(g_LvglMutex);
if (error)
{
ESP_LOGE(kTagDisplayImage, "PNG encoding error %u: %s", error,
lodepng_error_text(error));
httpd_resp_send_err(req, HTTPD_500_INTERNAL_SERVER_ERROR,
"PNG generation failed");
return ESP_FAIL;
}
ESP_LOGI(kTagDisplayImage,
"Prepared PNG, size: %zu bytes. Sending to client...", pngsize);
esp_err_t res = httpd_resp_send(req, (const char *)png, pngsize);
// No need to free(png) because it is managed by our bump allocator
// which automatically resets the entire 2MB buffer to 0 next time
// lodepng_allocator_reset() is called.
return res;
}
httpd_uri_t api_display_image_uri = {
.uri = "/api/display/image.png",
.method = HTTP_GET,
.handler = api_display_image_handler,
.user_ctx = NULL};
httpd_uri_t api_display_image_uri = {.uri = "/api/display/image.png",
.method = HTTP_GET,
.handler = api_display_image_handler,
.user_ctx = NULL};

223
Provider/main/lodepng_alloc.cpp
View File

@@ -4,149 +4,160 @@
#include <string.h>
// LVGL's LodePNG memory optimization
// Instead of standard heap allocations which fragment quickly and crash on the ESP32,
// we allocate a single massive buffer in PSRAM and just bump a pointer during encode!
// Instead of standard heap allocations which fragment quickly and crash on the
// ESP32, we allocate a single massive buffer in PSRAM and just bump a pointer
// during encode!
static const char* kTagLodeAlloc = "LODE_ALLOC";
static const char *kTagLodeAlloc = "LODE_ALLOC";
// 2MB buffer for LodePNG encoding intermediate state.
// A typical 800x480 grayscale PNG should compress to ~50-100KB, but the dynamic window
// matching and filtering algorithms need a good amount of scratch space.
// We can tune this down to 1MB if 2MB is too aggressive, but PSRAM provides 8MB.
#define LODEPNG_ALLOC_POOL_SIZE (2 * 1024 * 1024)
// 2MB buffer for LodePNG encoding intermediate state.
// A typical 800x480 grayscale PNG should compress to ~50-100KB, but the dynamic
// window matching and filtering algorithms need a good amount of scratch space.
// We can tune this down to 1MB if 2MB is too aggressive, but PSRAM provides
// 8MB.
#define LODEPNG_ALLOC_POOL_SIZE (1 * 1024 * 1024)
static uint8_t* s_lodepng_pool = nullptr;
static uint8_t *s_lodepng_pool = nullptr;
static size_t s_lodepng_pool_used = 0;
void lodepng_allocator_init()
{
if (s_lodepng_pool != nullptr) return;
if (s_lodepng_pool != nullptr)
return;
ESP_LOGI(kTagLodeAlloc, "Allocating %d bytes in PSRAM for LodePNG bump allocator...", LODEPNG_ALLOC_POOL_SIZE);
// SPIRAM fallback to internal if someone tests without a PSRAM chip
s_lodepng_pool = (uint8_t*)heap_caps_malloc(LODEPNG_ALLOC_POOL_SIZE, MALLOC_CAP_SPIRAM);
if (!s_lodepng_pool)
{
s_lodepng_pool = (uint8_t*)heap_caps_malloc(LODEPNG_ALLOC_POOL_SIZE, MALLOC_CAP_DEFAULT);
}
ESP_LOGI(kTagLodeAlloc,
"Allocating %d bytes in PSRAM for LodePNG bump allocator...",
LODEPNG_ALLOC_POOL_SIZE);
if (!s_lodepng_pool)
{
ESP_LOGE(kTagLodeAlloc, "CRITICAL: Failed to allocate LodePNG PSRAM pool!");
}
// SPIRAM fallback to internal if someone tests without a PSRAM chip
s_lodepng_pool =
(uint8_t *)heap_caps_malloc(LODEPNG_ALLOC_POOL_SIZE, MALLOC_CAP_SPIRAM);
if (!s_lodepng_pool)
{
s_lodepng_pool = (uint8_t *)heap_caps_malloc(LODEPNG_ALLOC_POOL_SIZE,
MALLOC_CAP_DEFAULT);
}
if (!s_lodepng_pool)
{
ESP_LOGE(kTagLodeAlloc, "CRITICAL: Failed to allocate LodePNG PSRAM pool!");
}
}
void lodepng_allocator_reset()
{
s_lodepng_pool_used = 0;
}
void lodepng_allocator_reset() { s_lodepng_pool_used = 0; }
void lodepng_allocator_free()
{
if (s_lodepng_pool)
{
free(s_lodepng_pool);
s_lodepng_pool = nullptr;
}
s_lodepng_pool_used = 0;
if (s_lodepng_pool)
{
free(s_lodepng_pool);
s_lodepng_pool = nullptr;
}
s_lodepng_pool_used = 0;
}
// ----------------------------------------------------
// Custom Allocators injected into lodepng.c
// ----------------------------------------------------
// To support realloc properly, we prefix each allocation with an 8-byte header storing the size.
struct AllocHeader {
size_t size;
// To support realloc properly, we prefix each allocation with an 8-byte header
// storing the size.
struct AllocHeader
{
size_t size;
};
void* lodepng_custom_malloc(size_t size)
void *lodepng_custom_malloc(size_t size)
{
if (!s_lodepng_pool)
{
ESP_LOGE(kTagLodeAlloc, "lodepng_malloc called before lodepng_allocator_init!");
return nullptr;
}
if (!s_lodepng_pool)
{
ESP_LOGE(kTagLodeAlloc,
"lodepng_malloc called before lodepng_allocator_init!");
return nullptr;
}
// Align size to 8 bytes to avoid unaligned access faults
size_t aligned_size = (size + 7) & ~7;
size_t total_alloc = sizeof(AllocHeader) + aligned_size;
// Align size to 8 bytes to avoid unaligned access faults
size_t aligned_size = (size + 7) & ~7;
size_t total_alloc = sizeof(AllocHeader) + aligned_size;
if (s_lodepng_pool_used + total_alloc > LODEPNG_ALLOC_POOL_SIZE)
{
ESP_LOGE(kTagLodeAlloc, "LodePNG pool exhausted! Requested: %zu, Used: %zu, Total: %d", size, s_lodepng_pool_used, LODEPNG_ALLOC_POOL_SIZE);
return nullptr;
}
if (s_lodepng_pool_used + total_alloc > LODEPNG_ALLOC_POOL_SIZE)
{
ESP_LOGE(kTagLodeAlloc,
"LodePNG pool exhausted! Requested: %zu, Used: %zu, Total: %d",
size, s_lodepng_pool_used, LODEPNG_ALLOC_POOL_SIZE);
return nullptr;
}
// Grab pointer and bump
uint8_t* ptr = s_lodepng_pool + s_lodepng_pool_used;
s_lodepng_pool_used += total_alloc;
// Grab pointer and bump
uint8_t *ptr = s_lodepng_pool + s_lodepng_pool_used;
s_lodepng_pool_used += total_alloc;
// Write header
AllocHeader* header = (AllocHeader*)ptr;
header->size = size; // We store exact size for realloc memcpy bounds
// Write header
AllocHeader *header = (AllocHeader *)ptr;
header->size = size; // We store exact size for realloc memcpy bounds
// Return pointer right after header
return ptr + sizeof(AllocHeader);
// Return pointer right after header
return ptr + sizeof(AllocHeader);
}
void* lodepng_custom_realloc(void* ptr, size_t new_size)
void *lodepng_custom_realloc(void *ptr, size_t new_size)
{
if (!ptr)
if (!ptr)
{
return lodepng_custom_malloc(new_size);
}
if (new_size == 0)
{
lodepng_custom_free(ptr);
return nullptr;
}
// Get original header
uint8_t *orig_ptr = (uint8_t *)ptr - sizeof(AllocHeader);
AllocHeader *header = (AllocHeader *)orig_ptr;
size_t old_size = header->size;
if (new_size <= old_size)
{
// Don't shrink to save time, bump allocator can't reclaim it easily anyway.
return ptr;
}
// Let's see if this ptr was the *very last* allocation.
// If so, we can just expand it in place!
size_t old_aligned_size = (old_size + 7) & ~7;
if (orig_ptr + sizeof(AllocHeader) + old_aligned_size ==
s_lodepng_pool + s_lodepng_pool_used)
{
// We are at the end! Just bump further!
size_t new_aligned_size = (new_size + 7) & ~7;
size_t size_diff = new_aligned_size - old_aligned_size;
if (s_lodepng_pool_used + size_diff > LODEPNG_ALLOC_POOL_SIZE)
{
return lodepng_custom_malloc(new_size);
}
if (new_size == 0)
{
lodepng_custom_free(ptr);
return nullptr;
ESP_LOGE(kTagLodeAlloc,
"LodePNG pool exhausted during in-place realloc!");
return nullptr;
}
// Get original header
uint8_t* orig_ptr = (uint8_t*)ptr - sizeof(AllocHeader);
AllocHeader* header = (AllocHeader*)orig_ptr;
s_lodepng_pool_used += size_diff;
header->size = new_size;
return ptr;
}
size_t old_size = header->size;
if (new_size <= old_size)
{
// Don't shrink to save time, bump allocator can't reclaim it easily anyway.
return ptr;
}
// Otherwise, we have to copy into a new block
void *new_ptr = lodepng_custom_malloc(new_size);
if (new_ptr)
{
memcpy(new_ptr, ptr, old_size);
}
// Let's see if this ptr was the *very last* allocation.
// If so, we can just expand it in place!
size_t old_aligned_size = (old_size + 7) & ~7;
if (orig_ptr + sizeof(AllocHeader) + old_aligned_size == s_lodepng_pool + s_lodepng_pool_used)
{
// We are at the end! Just bump further!
size_t new_aligned_size = (new_size + 7) & ~7;
size_t size_diff = new_aligned_size - old_aligned_size;
if (s_lodepng_pool_used + size_diff > LODEPNG_ALLOC_POOL_SIZE)
{
ESP_LOGE(kTagLodeAlloc, "LodePNG pool exhausted during in-place realloc!");
return nullptr;
}
s_lodepng_pool_used += size_diff;
header->size = new_size;
return ptr;
}
// Otherwise, we have to copy into a new block
void* new_ptr = lodepng_custom_malloc(new_size);
if (new_ptr)
{
memcpy(new_ptr, ptr, old_size);
}
return new_ptr;
return new_ptr;
}
void lodepng_custom_free(void* ptr)
void lodepng_custom_free(void *ptr)
{
// No-op! The bump pointer will just reset to 0 once the API endpoint is done!
(void)ptr;
// No-op! The bump pointer will just reset to 0 once the API endpoint is done!
(void)ptr;
}

148
Provider/main/lv_setup.cpp
View File

@@ -1,8 +1,11 @@
#include "lv_setup.hpp"
#include "esp_heap_caps.h"
#include "esp_log.h"
#include "esp_timer.h"
#include "freertos/task.h"
#include "lodepng_alloc.hpp"
#include "types.hpp"
internal const char *kTagLvgl = "LVGL";
@@ -13,94 +16,117 @@ uint8_t *g_LvglDrawBuffer = nullptr;
internal void lvgl_tick_task(void *arg)
{
while (true)
{
vTaskDelay(pdMS_TO_TICKS(10));
while (true)
{
vTaskDelay(pdMS_TO_TICKS(10));
if (xSemaphoreTake(g_LvglMutex, portMAX_DELAY) == pdTRUE)
{
lv_timer_handler();
xSemaphoreGive(g_LvglMutex);
}
if (xSemaphoreTake(g_LvglMutex, portMAX_DELAY) == pdTRUE)
{
lv_timer_handler();
xSemaphoreGive(g_LvglMutex);
}
}
}
internal uint32_t my_tick_get_cb()
{
return (uint32_t)(esp_timer_get_time() / 1000);
return (uint32_t)(esp_timer_get_time() / 1000);
}
internal void lv_dummy_flush_cb(lv_display_t *disp, const lv_area_t *area, uint8_t *px_map)
internal void lv_dummy_flush_cb(lv_display_t *disp, const lv_area_t *area,
uint8_t *px_map)
{
// Headless display, so we don't actually flush to SPI/I2C.
// We just tell LVGL that the "flush" is completed so it unblocks wait_for_flushing.
lv_display_flush_ready(disp);
// Headless display, so we don't actually flush to SPI/I2C.
// We just tell LVGL that the "flush" is completed so it unblocks
// wait_for_flushing.
lv_display_flush_ready(disp);
}
internal void lv_draw_sample_ui()
{
lv_obj_t *scr = lv_screen_active();
// Default background to white for the grayscale PNG
lv_obj_set_style_bg_color(scr, lv_color_white(), 0);
lv_obj_t *scr = lv_screen_active();
// Default background to white for the grayscale PNG
lv_obj_set_style_bg_color(scr, lv_color_white(), 0);
lv_obj_t *label = lv_label_create(scr);
lv_label_set_text(label, "Calendink Provider\nLVGL Headless Renderer");
lv_obj_align(label, LV_ALIGN_CENTER, 0, 0);
lv_obj_t *label = lv_label_create(scr);
lv_label_set_text(label, "Calendink Provider\nLVGL Headless Renderer");
lv_obj_align(label, LV_ALIGN_CENTER, 0, 0);
static lv_style_t style;
lv_style_init(&style);
lv_style_set_line_color(&style, lv_palette_main(LV_PALETTE_GREY));
lv_style_set_line_width(&style, 6);
lv_style_set_line_rounded(&style, true);
/*Create an object with the new style*/
lv_obj_t *obj = lv_line_create(scr);
lv_obj_add_style(obj, &style, 0);
static lv_point_precise_t p[] = {{10, 30}, {30, 50}, {100, 0}};
lv_line_set_points(obj, p, 3);
lv_obj_center(obj);
}
void setup_lvgl()
{
ESP_LOGI(kTagLvgl, "Initializing LVGL");
ESP_LOGI(kTagLvgl, "Initializing LVGL");
g_LvglMutex = xSemaphoreCreateMutex();
g_LvglMutex = xSemaphoreCreateMutex();
lv_init();
lv_tick_set_cb(my_tick_get_cb);
lv_init();
lv_tick_set_cb(my_tick_get_cb);
uint32_t width = CONFIG_CALENDINK_DISPLAY_WIDTH;
uint32_t height = CONFIG_CALENDINK_DISPLAY_HEIGHT;
uint32_t width = CONFIG_CALENDINK_DISPLAY_WIDTH;
uint32_t height = CONFIG_CALENDINK_DISPLAY_HEIGHT;
// Create a virtual display
g_LvglDisplay = lv_display_create(width, height);
lv_display_set_flush_cb(g_LvglDisplay, lv_dummy_flush_cb);
// Create a virtual display
g_LvglDisplay = lv_display_create(width, height);
lv_display_set_flush_cb(g_LvglDisplay, lv_dummy_flush_cb);
// Initialize LodePNG custom bump allocator
lodepng_allocator_init();
// Initialize LodePNG custom bump allocator
lodepng_allocator_init();
// Allocate draw buffers in PSRAM
// Using LV_COLOR_FORMAT_L8 (1 byte per pixel)
size_t buf_size = LV_DRAW_BUF_SIZE(width, height, LV_COLOR_FORMAT_L8);
// Fallback to MALLOC_CAP_DEFAULT if we can't get SPIRAM (for debugging without it)
void *buf1 = heap_caps_malloc(buf_size, MALLOC_CAP_SPIRAM);
if (!buf1)
{
ESP_LOGW(kTagLvgl, "Failed to allocate LVGL draw buffer in PSRAM, falling back to internal RAM");
buf1 = heap_caps_malloc(buf_size, MALLOC_CAP_DEFAULT);
}
if (!buf1)
{
ESP_LOGE(kTagLvgl, "Failed to allocate LVGL draw buffer entirely.");
return;
}
// Allocate draw buffers in PSRAM
// Using LV_COLOR_FORMAT_RGB565 (2 bytes per pixel)
size_t buf_size = LV_DRAW_BUF_SIZE(width, height, LV_COLOR_FORMAT_RGB565);
g_LvglDrawBuffer = (uint8_t *)buf1;
// Fallback to MALLOC_CAP_DEFAULT if we can't get SPIRAM (for debugging
// without it)
void *buf1 = heap_caps_malloc(buf_size, MALLOC_CAP_SPIRAM);
if (!buf1)
{
ESP_LOGW(kTagLvgl, "Failed to allocate LVGL draw buffer in PSRAM, falling "
"back to internal RAM");
buf1 = heap_caps_malloc(buf_size, MALLOC_CAP_DEFAULT);
}
lv_display_set_buffers(g_LvglDisplay, buf1, nullptr, buf_size, LV_DISPLAY_RENDER_MODE_FULL);
// Explicitly set the color format of the display if it's set in sdkconfig/driver
lv_display_set_color_format(g_LvglDisplay, LV_COLOR_FORMAT_L8);
if (!buf1)
{
ESP_LOGE(kTagLvgl, "Failed to allocate LVGL draw buffer entirely.");
return;
}
// Create the background task for the LVGL timer
xTaskCreate(lvgl_tick_task, "LVGL Tick", 4096, nullptr, 5, nullptr);
g_LvglDrawBuffer = (uint8_t *)buf1;
// Draw the sample UI
if (xSemaphoreTake(g_LvglMutex, portMAX_DELAY) == pdTRUE)
{
lv_draw_sample_ui();
xSemaphoreGive(g_LvglMutex);
}
// Explicitly set the color format of the display FIRST
// so that stride and byte-per-pixel calculations align with our buffer.
lv_display_set_color_format(g_LvglDisplay, LV_COLOR_FORMAT_RGB565);
ESP_LOGI(kTagLvgl, "LVGL fully initialized. Display %lux%lu created.", width, height);
lv_display_set_buffers(g_LvglDisplay, buf1, nullptr, buf_size,
LV_DISPLAY_RENDER_MODE_FULL);
// Create the background task for the LVGL timer
xTaskCreate(lvgl_tick_task, "LVGL Tick", 4096, nullptr, 5, nullptr);
// Draw the sample UI
if (xSemaphoreTake(g_LvglMutex, portMAX_DELAY) == pdTRUE)
{
lv_draw_sample_ui();
xSemaphoreGive(g_LvglMutex);
}
ESP_LOGI(kTagLvgl, "LVGL fully initialized. Display %lux%lu created.", width,
height);
}