Last piece to connect client to provider: actually downloading the image and displaying it
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@@ -0,0 +1,235 @@
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// GET /api/devices/screen.bin?mac=XX — Render and return a raw 2bpp grayscale
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// bitmap for the device's current screen.
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// Uses LVGL to render the device's XML layout, quantizes to 4 grayscale levels,
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// and packs into 2 bits per pixel (96,000 bytes for 800×480).
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#include "esp_heap_caps.h"
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#include "esp_http_server.h"
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#include "esp_log.h"
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#include "lv_setup.hpp"
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#include "lvgl.h"
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#include <string.h>
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#include "device.hpp"
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#include "types.hpp"
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internal const char *kTagDeviceScreenBitmap = "API_DEV_SCREEN_BMP";
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internal esp_err_t api_devices_screen_bitmap_handler(httpd_req_t *req)
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{
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httpd_resp_set_hdr(req, "Access-Control-Allow-Origin", "*");
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httpd_resp_set_hdr(req, "Cache-Control",
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"no-cache, no-store, must-revalidate");
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httpd_resp_set_type(req, "application/octet-stream");
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// Extract mac query parameter
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char mac[18] = {};
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size_t buf_len = httpd_req_get_url_query_len(req) + 1;
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if (buf_len > 1)
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{
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char query[64] = {};
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if (httpd_req_get_url_query_str(req, query, sizeof(query)) == ESP_OK)
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{
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httpd_query_key_value(query, "mac", mac, sizeof(mac));
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}
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}
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if (mac[0] == '\0')
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{
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httpd_resp_send_err(req, HTTPD_400_BAD_REQUEST,
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"Missing 'mac' query param");
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return ESP_FAIL;
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}
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device_t *dev = find_device(mac);
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if (!dev)
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{
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httpd_resp_send_err(req, HTTPD_404_NOT_FOUND, "Device not registered");
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return ESP_FAIL;
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}
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// --- LVGL rendering (mutex-protected) ---
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if (xSemaphoreTake(g_LvglMutex, pdMS_TO_TICKS(5000)) != pdTRUE)
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{
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ESP_LOGE(kTagDeviceScreenBitmap, "Failed to get LVGL mutex");
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httpd_resp_send_err(req, HTTPD_500_INTERNAL_SERVER_ERROR, "LVGL busy");
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return ESP_FAIL;
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}
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lv_obj_t *scr = lv_screen_active();
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// Clear all children from the active screen
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lv_obj_clean(scr);
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// White background for grayscale
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lv_obj_set_style_bg_color(scr, lv_color_white(), LV_PART_MAIN);
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// Setup the MAC address subject so the XML can bind to it
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static lv_subject_t mac_subject;
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static char mac_buf[18];
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static char mac_prev_buf[18];
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strncpy(mac_buf, mac, sizeof(mac_buf));
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strncpy(mac_prev_buf, mac, sizeof(mac_prev_buf));
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lv_subject_init_string(&mac_subject, mac_buf, mac_prev_buf, sizeof(mac_buf),
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mac);
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// Register the subject in the global XML scope under the name "device_mac"
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lv_xml_component_scope_t *global_scope =
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lv_xml_component_get_scope("globals");
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if (global_scope)
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{
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lv_xml_register_subject(global_scope, "device_mac", &mac_subject);
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ESP_LOGI(kTagDeviceScreenBitmap,
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"Registered subject 'device_mac' with value: %s", mac);
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}
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bool render_success = false;
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// 1. Prepare the XML payload
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const char *xml_to_register = NULL;
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if (dev->xml_layout[0] == '\0')
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{
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ESP_LOGI(kTagDeviceScreenBitmap, "Device %s has no layout xml.", mac);
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xSemaphoreGive(g_LvglMutex);
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httpd_resp_send_err(req, HTTPD_404_NOT_FOUND, "No layout configured");
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return ESP_FAIL;
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}
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if (strstr(dev->xml_layout, "<screen") != NULL)
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{
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xml_to_register = dev->xml_layout;
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ESP_LOGI(kTagDeviceScreenBitmap,
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"XML already contains <screen>, passing directly to parser.");
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}
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// 2. Register the XML payload as a component
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lv_result_t res =
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lv_xml_register_component_from_data("current_device", xml_to_register);
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if (res == LV_RESULT_OK)
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{
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ESP_LOGI(kTagDeviceScreenBitmap,
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"Successfully registered XML for device %s", mac);
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lv_obj_t *new_scr = lv_xml_create_screen("current_device");
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if (new_scr)
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{
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lv_screen_load(new_scr);
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scr = new_scr;
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render_success = true;
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}
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else
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{
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ESP_LOGE(kTagDeviceScreenBitmap,
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"lv_xml_create_screen failed for device %s", mac);
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}
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}
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else
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{
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ESP_LOGE(kTagDeviceScreenBitmap,
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"lv_xml_register_component_from_data failed for device %s", mac);
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}
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// 3. Fallback if LVGL XML parsing or creation failed
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if (!render_success)
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{
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ESP_LOGW(kTagDeviceScreenBitmap,
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"XML render failed, falling back to raw text layout");
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lv_obj_t *label = lv_label_create(scr);
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lv_label_set_text(label, "XML Parsing Error\nSee serial log");
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lv_obj_set_style_text_color(label, lv_color_black(), LV_PART_MAIN);
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lv_obj_align(label, LV_ALIGN_CENTER, 0, 0);
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}
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// Force LVGL to fully render the screen
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lv_refr_now(g_LvglDisplay);
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lv_draw_buf_t *draw_buf = lv_display_get_buf_active(g_LvglDisplay);
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if (!draw_buf)
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{
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xSemaphoreGive(g_LvglMutex);
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ESP_LOGE(kTagDeviceScreenBitmap, "No active draw buffer");
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httpd_resp_send_err(req, HTTPD_500_INTERNAL_SERVER_ERROR,
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"Display uninitialized");
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return ESP_FAIL;
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}
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uint32_t width = CONFIG_CALENDINK_DISPLAY_WIDTH;
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uint32_t height = CONFIG_CALENDINK_DISPLAY_HEIGHT;
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// Output: 2 bits per pixel, 4 pixels per byte → width*height/4 bytes
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constexpr uint32_t kBitmapSize = 96000; // 800 * 480 / 4
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uint8_t *bitmap = (uint8_t *)heap_caps_malloc(kBitmapSize, MALLOC_CAP_SPIRAM);
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if (!bitmap)
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{
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bitmap = (uint8_t *)malloc(kBitmapSize);
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if (!bitmap)
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{
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xSemaphoreGive(g_LvglMutex);
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ESP_LOGE(kTagDeviceScreenBitmap, "Failed to allocate bitmap buffer");
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httpd_resp_send_err(req, HTTPD_500_INTERNAL_SERVER_ERROR,
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"Out of memory");
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return ESP_FAIL;
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}
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}
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// LVGL renders into RGB565 (2 bytes per pixel).
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// Quantize to 4 grayscale levels and pack 4 pixels per byte (2bpp).
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// Pixel encoding (MSB first):
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// 0b00 = BLACK (lum 0)
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// 0b01 = DARK_GRAY (lum 85)
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// 0b10 = LIGHT_GRAY (lum 170)
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// 0b11 = WHITE (lum 255)
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uint32_t bitmap_idx = 0;
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for (uint32_t y = 0; y < height; ++y)
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{
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const uint16_t *src_row =
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(const uint16_t *)((const uint8_t *)draw_buf->data +
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(y * draw_buf->header.stride));
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for (uint32_t x = 0; x < width; x += 4)
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{
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uint8_t packed = 0;
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for (int p = 0; p < 4; ++p)
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{
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uint16_t c = src_row[x + p];
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// Expand 5/6/5 components
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uint8_t r_5 = (c >> 11) & 0x1F;
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uint8_t g_6 = (c >> 5) & 0x3F;
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uint8_t b_5 = c & 0x1F;
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// Unpack to 8-bit
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uint8_t r = (r_5 << 3) | (r_5 >> 2);
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uint8_t g = (g_6 << 2) | (g_6 >> 4);
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uint8_t b = (b_5 << 3) | (b_5 >> 2);
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// Luminance → 2-bit quantized level (0..3)
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uint8_t lum = (r * 77 + g * 150 + b * 29) >> 8;
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uint8_t level = lum >> 6; // 0,1,2,3
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packed |= (level << (6 - p * 2));
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}
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bitmap[bitmap_idx++] = packed;
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}
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}
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xSemaphoreGive(g_LvglMutex);
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ESP_LOGI(kTagDeviceScreenBitmap, "Bitmap ready: %lu bytes. Sending...",
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(unsigned long)bitmap_idx);
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esp_err_t sendRes = httpd_resp_send(req, (const char *)bitmap, bitmap_idx);
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free(bitmap);
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return sendRes;
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}
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internal const httpd_uri_t api_devices_screen_bitmap_uri = {
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.uri = "/api/devices/screen.bin",
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.method = HTTP_GET,
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.handler = api_devices_screen_bitmap_handler,
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.user_ctx = NULL};
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@@ -6,4 +6,5 @@
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#include "api/devices/layout.cpp"
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#include "api/devices/screen.cpp"
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#include "api/devices/screen_image.cpp"
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#include "api/devices/screen_bitmap.cpp"
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// clang-format on
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@@ -308,6 +308,7 @@ internal httpd_handle_t start_webserver(void)
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httpd_register_uri_handler(server, &api_devices_layout_uri);
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httpd_register_uri_handler(server, &api_devices_screen_info_uri);
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httpd_register_uri_handler(server, &api_devices_screen_image_uri);
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httpd_register_uri_handler(server, &api_devices_screen_bitmap_uri);
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// Populate dummy data for development (debug builds only)
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#ifndef NDEBUG
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