Momentum-Apps/src-fap/views/camera_suite_view_camera.c

#include "../camera_suite.h"
#include <furi.h>
#include <furi_hal.h>
#include <input/input.h>
#include <gui/elements.h>
#include <dolphin/dolphin.h>
#include "../helpers/camera_suite_haptic.h"
#include "../helpers/camera_suite_speaker.h"
#include "../helpers/camera_suite_led.h"

static CameraSuiteViewStyle1* current_instance = NULL;
// Dithering type:
//    0 = Floyd Steinberg (default)
//    1 = Atkinson
static int current_dithering = 0;

struct CameraSuiteViewStyle1 {
    CameraSuiteViewStyle1Callback callback;
    FuriStreamBuffer* rx_stream;
    FuriThread* worker_thread;
    View* view;
    void* context;
};

void camera_suite_view_camera_set_callback(
    CameraSuiteViewStyle1* instance,
    CameraSuiteViewStyle1Callback callback,
    void* context) {
    furi_assert(instance);
    furi_assert(callback);
    instance->callback = callback;
    instance->context = context;
}

static void camera_suite_view_camera_draw(Canvas* canvas, UartDumpModel* model) {
    // Clear the screen.
    canvas_set_color(canvas, ColorBlack);

    // Draw the frame.
    canvas_draw_frame(canvas, 0, 0, FRAME_WIDTH, FRAME_HEIGHT);

    CameraSuite* app = current_instance->context;

    // Draw the pixels with rotation.
    for(size_t p = 0; p < FRAME_BUFFER_LENGTH; ++p) {
        uint8_t x = p % ROW_BUFFER_LENGTH; // 0 .. 15
        uint8_t y = p / ROW_BUFFER_LENGTH; // 0 .. 63

        // Apply rotation
        int16_t rotated_x, rotated_y;
        switch(app->orientation) {
        case 1: // 90 degrees
            rotated_x = y;
            rotated_y = FRAME_WIDTH - 1 - x;
            break;
        case 2: // 180 degrees
            rotated_x = FRAME_WIDTH - 1 - x;
            rotated_y = FRAME_HEIGHT - 1 - y;
            break;
        case 3: // 270 degrees
            rotated_x = FRAME_HEIGHT - 1 - y;
            rotated_y = x;
            break;
        case 0: // 0 degrees
        default:
            rotated_x = x;
            rotated_y = y;
            break;
        }

        for(uint8_t i = 0; i < 8; ++i) {
            if((model->pixels[p] & (1 << i)) != 0) {
                // Adjust the coordinates based on the new screen dimensions
                uint16_t screen_x, screen_y;
                switch(app->orientation) {
                case 1: // 90 degrees
                    screen_x = rotated_x;
                    screen_y = FRAME_HEIGHT - 8 + (rotated_y * 8) + i;
                    break;
                case 2: // 180 degrees
                    screen_x = FRAME_WIDTH - 8 + (rotated_x * 8) + i;
                    screen_y = FRAME_HEIGHT - 1 - rotated_y;
                    break;
                case 3: // 270 degrees
                    screen_x = FRAME_WIDTH - 1 - rotated_x;
                    screen_y = rotated_y * 8 + i;
                    break;
                case 0: // 0 degrees
                default:
                    screen_x = rotated_x * 8 + i;
                    screen_y = rotated_y;
                    break;
                }
                canvas_draw_dot(canvas, screen_x, screen_y);
            }
        }
    }
    // Draw the guide if the camera is not initialized.
    if(!model->initialized) {
        canvas_draw_icon(canvas, 74, 16, &I_DolphinCommon_56x48);
        canvas_set_font(canvas, FontSecondary);
        canvas_draw_str(canvas, 8, 12, "Connect the ESP32-CAM");
        canvas_draw_str(canvas, 20, 24, "VCC - 3V3");
        canvas_draw_str(canvas, 20, 34, "GND - GND");
        canvas_draw_str(canvas, 20, 44, "U0R - TX");
        canvas_draw_str(canvas, 20, 54, "U0T - RX");
    }
}

static void camera_suite_view_camera_model_init(UartDumpModel* const model) {
    for(size_t i = 0; i < FRAME_BUFFER_LENGTH; i++) {
        model->pixels[i] = 0;
    }
}

static bool camera_suite_view_camera_input(InputEvent* event, void* context) {
    furi_assert(context);
    CameraSuiteViewStyle1* instance = context;
    if(event->type == InputTypeRelease) {
        switch(event->key) {
        default: // Stop all sounds, reset the LED.
            with_view_model(
                instance->view,
                UartDumpModel * model,
                {
                    UNUSED(model);
                    camera_suite_play_bad_bump(instance->context);
                    camera_suite_stop_all_sound(instance->context);
                    camera_suite_led_set_rgb(instance->context, 0, 0, 0);
                },
                true);
            break;
        }
        // Send `data` to the ESP32-CAM
    } else if(event->type == InputTypePress) {
        uint8_t data[1];
        switch(event->key) {
        case InputKeyBack:
            // Stop the camera stream.
            data[0] = 's';
            // Go back to the main menu.
            with_view_model(
                instance->view,
                UartDumpModel * model,
                {
                    UNUSED(model);
                    instance->callback(CameraSuiteCustomEventSceneStyle1Back, instance->context);
                },
                true);
            break;
        case InputKeyLeft:
            // Camera: Invert.
            data[0] = '<';
            with_view_model(
                instance->view,
                UartDumpModel * model,
                {
                    UNUSED(model);
                    camera_suite_play_happy_bump(instance->context);
                    camera_suite_play_input_sound(instance->context);
                    camera_suite_led_set_rgb(instance->context, 0, 0, 255);
                    instance->callback(CameraSuiteCustomEventSceneStyle1Left, instance->context);
                },
                true);
            break;
        case InputKeyRight:
            // Camera: Enable/disable dithering.
            data[0] = '>';
            with_view_model(
                instance->view,
                UartDumpModel * model,
                {
                    UNUSED(model);
                    camera_suite_play_happy_bump(instance->context);
                    camera_suite_play_input_sound(instance->context);
                    camera_suite_led_set_rgb(instance->context, 0, 0, 255);
                    instance->callback(CameraSuiteCustomEventSceneStyle1Right, instance->context);
                },
                true);
            break;
        case InputKeyUp:
            // Camera: Increase contrast.
            data[0] = 'C';
            with_view_model(
                instance->view,
                UartDumpModel * model,
                {
                    UNUSED(model);
                    camera_suite_play_happy_bump(instance->context);
                    camera_suite_play_input_sound(instance->context);
                    camera_suite_led_set_rgb(instance->context, 0, 0, 255);
                    instance->callback(CameraSuiteCustomEventSceneStyle1Up, instance->context);
                },
                true);
            break;
        case InputKeyDown:
            // Camera: Reduce contrast.
            data[0] = 'c';
            with_view_model(
                instance->view,
                UartDumpModel * model,
                {
                    UNUSED(model);
                    camera_suite_play_happy_bump(instance->context);
                    camera_suite_play_input_sound(instance->context);
                    camera_suite_led_set_rgb(instance->context, 0, 0, 255);
                    instance->callback(CameraSuiteCustomEventSceneStyle1Down, instance->context);
                },
                true);
            break;
        case InputKeyOk:
            if(current_dithering == 0) {
                data[0] = 'd'; // Update to Floyd Steinberg dithering.
                current_dithering = 1;
            } else {
                data[0] = 'D'; // Update to Atkinson dithering.
                current_dithering = 0;
            }
            with_view_model(
                instance->view,
                UartDumpModel * model,
                {
                    UNUSED(model);
                    camera_suite_play_happy_bump(instance->context);
                    camera_suite_play_input_sound(instance->context);
                    camera_suite_led_set_rgb(instance->context, 0, 0, 255);
                    instance->callback(CameraSuiteCustomEventSceneStyle1Ok, instance->context);
                },
                true);
            break;
        case InputKeyMAX:
            break;
        }
        // Send `data` to the ESP32-CAM
        furi_hal_uart_tx(FuriHalUartIdUSART1, data, 1);
    }
    return true;
}

static void camera_suite_view_camera_exit(void* context) {
    furi_assert(context);
}

static void camera_suite_view_camera_enter(void* context) {
    // Check `context` for null. If it is null, abort program, else continue.
    furi_assert(context);

    // Cast `context` to `CameraSuiteViewStyle1*` and store it in `instance`.
    CameraSuiteViewStyle1* instance = (CameraSuiteViewStyle1*)context;

    // Assign the current instance to the global variable
    current_instance = instance;

    uint8_t data[1];
    data[0] = 'S'; // Uppercase `S` to start the camera
    // Send `data` to the ESP32-CAM
    furi_hal_uart_tx(FuriHalUartIdUSART1, data, 1);

    with_view_model(
        instance->view,
        UartDumpModel * model,
        { camera_suite_view_camera_model_init(model); },
        true);
}

static void camera_on_irq_cb(UartIrqEvent uartIrqEvent, uint8_t data, void* context) {
    // Check `context` for null. If it is null, abort program, else continue.
    furi_assert(context);

    // Cast `context` to `CameraSuiteViewStyle1*` and store it in `instance`.
    CameraSuiteViewStyle1* instance = context;

    // If `uartIrqEvent` is `UartIrqEventRXNE`, send the data to the
    // `rx_stream` and set the `WorkerEventRx` flag.
    if(uartIrqEvent == UartIrqEventRXNE) {
        furi_stream_buffer_send(instance->rx_stream, &data, 1, 0);
        furi_thread_flags_set(furi_thread_get_id(instance->worker_thread), WorkerEventRx);
    }
}

static void process_ringbuffer(UartDumpModel* model, uint8_t byte) {
    // First char has to be 'Y' in the buffer.
    if(model->ringbuffer_index == 0 && byte != 'Y') {
        return;
    }

    // Second char has to be ':' in the buffer or reset.
    if(model->ringbuffer_index == 1 && byte != ':') {
        model->ringbuffer_index = 0;
        process_ringbuffer(model, byte);
        return;
    }

    // Assign current byte to the ringbuffer.
    model->row_ringbuffer[model->ringbuffer_index] = byte;
    // Increment the ringbuffer index.
    ++model->ringbuffer_index;

    // Let's wait 'till the buffer fills.
    if(model->ringbuffer_index < RING_BUFFER_LENGTH) {
        return;
    }

    // Flush the ringbuffer to the framebuffer.
    model->ringbuffer_index = 0; // Reset the ringbuffer
    model->initialized = true; // Established the connection successfully.
    size_t row_start_index =
        model->row_ringbuffer[2] * ROW_BUFFER_LENGTH; // Third char will determine the row number

    if(row_start_index > LAST_ROW_INDEX) { // Failsafe
        row_start_index = 0;
    }

    for(size_t i = 0; i < ROW_BUFFER_LENGTH; ++i) {
        model->pixels[row_start_index + i] =
            model->row_ringbuffer[i + 3]; // Writing the remaining 16 bytes into the frame buffer
    }
}

static int32_t camera_worker(void* context) {
    furi_assert(context);
    CameraSuiteViewStyle1* instance = context;

    while(1) {
        uint32_t events =
            furi_thread_flags_wait(WORKER_EVENTS_MASK, FuriFlagWaitAny, FuriWaitForever);
        furi_check((events & FuriFlagError) == 0);

        if(events & WorkerEventStop) {
            break;
        } else if(events & WorkerEventRx) {
            size_t length = 0;
            do {
                size_t intended_data_size = 64;
                uint8_t data[intended_data_size];
                length =
                    furi_stream_buffer_receive(instance->rx_stream, data, intended_data_size, 0);

                if(length > 0) {
                    with_view_model(
                        instance->view,
                        UartDumpModel * model,
                        {
                            for(size_t i = 0; i < length; i++) {
                                process_ringbuffer(model, data[i]);
                            }
                        },
                        false);
                }
            } while(length > 0);
        }
    }

    return 0;
}

CameraSuiteViewStyle1* camera_suite_view_camera_alloc() {
    CameraSuiteViewStyle1* instance = malloc(sizeof(CameraSuiteViewStyle1));

    instance->view = view_alloc();

    instance->rx_stream = furi_stream_buffer_alloc(2048, 1);

    // Set up views
    view_allocate_model(instance->view, ViewModelTypeLocking, sizeof(UartDumpModel));
    view_set_context(instance->view, instance); // furi_assert crashes in events without this
    view_set_draw_callback(instance->view, (ViewDrawCallback)camera_suite_view_camera_draw);
    view_set_input_callback(instance->view, camera_suite_view_camera_input);
    view_set_enter_callback(instance->view, camera_suite_view_camera_enter);
    view_set_exit_callback(instance->view, camera_suite_view_camera_exit);

    with_view_model(
        instance->view,
        UartDumpModel * model,
        { camera_suite_view_camera_model_init(model); },
        true);

    instance->worker_thread = furi_thread_alloc_ex("UsbUartWorker", 2048, camera_worker, instance);
    furi_thread_start(instance->worker_thread);

    // Enable uart listener
    furi_hal_console_disable();
    furi_hal_uart_set_br(FuriHalUartIdUSART1, 230400);
    furi_hal_uart_set_irq_cb(FuriHalUartIdUSART1, camera_on_irq_cb, instance);

    return instance;
}

void camera_suite_view_camera_free(CameraSuiteViewStyle1* instance) {
    furi_assert(instance);

    with_view_model(
        instance->view, UartDumpModel * model, { UNUSED(model); }, true);
    view_free(instance->view);
    free(instance);
}

View* camera_suite_view_camera_get_view(CameraSuiteViewStyle1* instance) {
    furi_assert(instance);
    return instance->view;
}