Megapixels/src/main.c

#include "main.h"

#include "camera_config.h"
#include "flash.h"
#include "gl_util.h"
#include "io_pipeline.h"
#include "process_pipeline.h"
#include <asm/errno.h>
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <gtk/gtk.h>
#include <limits.h>
#include <linux/kdev_t.h>
#include <linux/media.h>
#include <linux/v4l2-subdev.h>
#include <linux/videodev2.h>
#include <locale.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/sysmacros.h>
#include <time.h>
#include <wordexp.h>
#include <zbar.h>

// #define RENDERDOC

#ifdef RENDERDOC
#include <dlfcn.h>
#include <renderdoc/app.h>
RENDERDOC_API_1_1_2 *rdoc_api = NULL;
#endif

enum user_control { USER_CONTROL_ISO, USER_CONTROL_SHUTTER };

static bool camera_is_initialized = false;
static const struct mp_camera_config *camera = NULL;
static MPCameraMode mode;

static int preview_width = -1;
static int preview_height = -1;

static int device_rotation = 0;

static bool gain_is_manual = false;
static int gain;
static int gain_max;

static bool exposure_is_manual = false;
static int exposure;

static bool has_auto_focus_continuous;
static bool has_auto_focus_start;

static bool flash_enabled = true;

static bool setting_save_dng;

static MPProcessPipelineBuffer *current_preview_buffer = NULL;
static int preview_buffer_width = -1;
static int preview_buffer_height = -1;

static char last_path[260] = "";

static MPZBarScanResult *zbar_result = NULL;

static int burst_length = 3;

// Widgets
GtkWidget *preview;
GtkWidget *main_stack;
GtkWidget *open_last_stack;
GtkWidget *thumb_last;
GtkWidget *process_spinner;
GtkWidget *scanned_codes;
GtkWidget *preview_top_box;
GtkWidget *preview_bottom_box;
GtkWidget *flash_button;

GSettings *settings;

int
remap(int value, int input_min, int input_max, int output_min, int output_max)
{
        const long long factor = 1000000000;
        long long output_spread = output_max - output_min;
        long long input_spread = input_max - input_min;

        long long zero_value = value - input_min;
        zero_value *= factor;
        long long percentage = zero_value / input_spread;

        long long zero_output = percentage * output_spread / factor;

        long long result = output_min + zero_output;
        return (int)result;
}

static void
update_io_pipeline()
{
        struct mp_io_pipeline_state io_state = {
                .camera = camera,
                .burst_length = burst_length,
                .preview_width = preview_width,
                .preview_height = preview_height,
                .device_rotation = device_rotation,
                .gain_is_manual = gain_is_manual,
                .gain = gain,
                .exposure_is_manual = exposure_is_manual,
                .exposure = exposure,
                .save_dng = setting_save_dng,
                .flash_enabled = flash_enabled,
        };
        mp_io_pipeline_update_state(&io_state);

        // Make the right settings available for the camera
        gtk_widget_set_visible(flash_button, camera->has_flash);
}

static bool
update_state(const struct mp_main_state *state)
{
        if (!camera_is_initialized) {
                camera_is_initialized = true;
        }

        if (camera == state->camera) {
                mode = state->mode;

                if (!gain_is_manual) {
                        gain = state->gain;
                }
                gain_max = state->gain_max;

                if (!exposure_is_manual) {
                        exposure = state->exposure;
                }

                has_auto_focus_continuous = state->has_auto_focus_continuous;
                has_auto_focus_start = state->has_auto_focus_start;
        }

        preview_buffer_width = state->image_width;
        preview_buffer_height = state->image_height;

        return false;
}

void
mp_main_update_state(const struct mp_main_state *state)
{
        struct mp_main_state *state_copy = malloc(sizeof(struct mp_main_state));
        *state_copy = *state;

        g_main_context_invoke_full(g_main_context_default(),
                                   G_PRIORITY_DEFAULT_IDLE,
                                   (GSourceFunc)update_state,
                                   state_copy,
                                   free);
}

static bool
set_zbar_result(MPZBarScanResult *result)
{
        if (zbar_result) {
                for (uint8_t i = 0; i < zbar_result->size; ++i) {
                        free(zbar_result->codes[i].data);
                }

                free(zbar_result);
        }

        zbar_result = result;
        gtk_widget_queue_draw(preview);

        return false;
}

void
mp_main_set_zbar_result(MPZBarScanResult *result)
{
        g_main_context_invoke_full(g_main_context_default(),
                                   G_PRIORITY_DEFAULT_IDLE,
                                   (GSourceFunc)set_zbar_result,
                                   result,
                                   NULL);
}

static bool
set_preview(MPProcessPipelineBuffer *buffer)
{
        if (current_preview_buffer) {
                mp_process_pipeline_buffer_unref(current_preview_buffer);
        }
        current_preview_buffer = buffer;
        gtk_widget_queue_draw(preview);
        return false;
}

void
mp_main_set_preview(MPProcessPipelineBuffer *buffer)
{
        g_main_context_invoke_full(g_main_context_default(),
                                   G_PRIORITY_DEFAULT_IDLE,
                                   (GSourceFunc)set_preview,
                                   buffer,
                                   NULL);
}

struct capture_completed_args {
        GdkTexture *thumb;
        char *fname;
};

static bool
capture_completed(struct capture_completed_args *args)
{
        strncpy(last_path, args->fname, 259);

        gtk_image_set_from_paintable(GTK_IMAGE(thumb_last),
                                     GDK_PAINTABLE(args->thumb));

        gtk_spinner_stop(GTK_SPINNER(process_spinner));
        gtk_stack_set_visible_child(GTK_STACK(open_last_stack), thumb_last);

        g_object_unref(args->thumb);
        g_free(args->fname);

        return false;
}

void
mp_main_capture_completed(GdkTexture *thumb, const char *fname)
{
        struct capture_completed_args *args =
                malloc(sizeof(struct capture_completed_args));
        args->thumb = thumb;
        args->fname = g_strdup(fname);
        g_main_context_invoke_full(g_main_context_default(),
                                   G_PRIORITY_DEFAULT_IDLE,
                                   (GSourceFunc)capture_completed,
                                   args,
                                   free);
}

static GLuint blit_program;
static GLuint blit_uniform_transform;
static GLuint blit_uniform_texture;
static GLuint solid_program;
static GLuint solid_uniform_color;
static GLuint quad;

static void
preview_realize(GtkGLArea *area)
{
        gtk_gl_area_make_current(area);

        if (gtk_gl_area_get_error(area) != NULL) {
                return;
        }

        // Make a VAO for OpenGL
        if (!gtk_gl_area_get_use_es(area)) {
                GLuint vao;
                glGenVertexArrays(1, &vao);
                glBindVertexArray(vao);
                check_gl();
        }

        GLuint blit_shaders[] = {
                gl_util_load_shader("/org/postmarketos/Megapixels/blit.vert",
                                    GL_VERTEX_SHADER,
                                    NULL,
                                    0),
                gl_util_load_shader("/org/postmarketos/Megapixels/blit.frag",
                                    GL_FRAGMENT_SHADER,
                                    NULL,
                                    0),
        };

        blit_program = gl_util_link_program(blit_shaders, 2);
        glBindAttribLocation(blit_program, GL_UTIL_VERTEX_ATTRIBUTE, "vert");
        glBindAttribLocation(blit_program, GL_UTIL_TEX_COORD_ATTRIBUTE, "tex_coord");
        check_gl();

        blit_uniform_transform = glGetUniformLocation(blit_program, "transform");
        blit_uniform_texture = glGetUniformLocation(blit_program, "texture");

        GLuint solid_shaders[] = {
                gl_util_load_shader("/org/postmarketos/Megapixels/solid.vert",
                                    GL_VERTEX_SHADER,
                                    NULL,
                                    0),
                gl_util_load_shader("/org/postmarketos/Megapixels/solid.frag",
                                    GL_FRAGMENT_SHADER,
                                    NULL,
                                    0),
        };

        solid_program = gl_util_link_program(solid_shaders, 2);
        glBindAttribLocation(solid_program, GL_UTIL_VERTEX_ATTRIBUTE, "vert");
        check_gl();

        solid_uniform_color = glGetUniformLocation(solid_program, "color");

        quad = gl_util_new_quad();
}

static void
position_preview(float *offset_x, float *offset_y, float *size_x, float *size_y)
{
        int buffer_width, buffer_height;
        if (device_rotation == 0 || device_rotation == 180) {
                buffer_width = preview_buffer_width;
                buffer_height = preview_buffer_height;
        } else {
                buffer_width = preview_buffer_height;
                buffer_height = preview_buffer_width;
        }

        int scale_factor = gtk_widget_get_scale_factor(preview);
        int top_height =
                gtk_widget_get_allocated_height(preview_top_box) * scale_factor;
        int bottom_height =
                gtk_widget_get_allocated_height(preview_bottom_box) * scale_factor;
        int inner_height = preview_height - top_height - bottom_height;

        double scale = MIN(preview_width / (float)buffer_width,
                           preview_height / (float)buffer_height);

        *size_x = scale * buffer_width;
        *size_y = scale * buffer_height;

        *offset_x = (preview_width - *size_x) / 2.0;

        if (*size_y > inner_height) {
                *offset_y = (preview_height - *size_y) / 2.0;
        } else {
                *offset_y = top_height + (inner_height - *size_y) / 2.0;
        }
}

static gboolean
preview_draw(GtkGLArea *area, GdkGLContext *ctx, gpointer data)
{
        if (gtk_gl_area_get_error(area) != NULL) {
                return FALSE;
        }

        if (!camera_is_initialized) {
                return FALSE;
        }

#ifdef RENDERDOC
        if (rdoc_api) {
                rdoc_api->StartFrameCapture(NULL, NULL);
        }
#endif

        glClearColor(0, 0, 0, 1);
        glClear(GL_COLOR_BUFFER_BIT);

        float offset_x, offset_y, size_x, size_y;
        position_preview(&offset_x, &offset_y, &size_x, &size_y);
        glViewport(offset_x, preview_height - size_y - offset_y, size_x, size_y);

        if (current_preview_buffer) {
                glUseProgram(blit_program);

                GLfloat rotation_list[4] = { 0, -1, 0, 1 };
                int rotation_index = device_rotation / 90;

                GLfloat sin_rot = rotation_list[rotation_index];
                GLfloat cos_rot = rotation_list[(4 + rotation_index - 1) % 4];
                GLfloat matrix[9] = {
                        // clang-format off
			cos_rot,  sin_rot, 0,
			-sin_rot, cos_rot, 0,
			0,              0, 1,
                        // clang-format on
                };
                glUniformMatrix3fv(blit_uniform_transform, 1, GL_FALSE, matrix);
                check_gl();

                glActiveTexture(GL_TEXTURE0);
                glBindTexture(GL_TEXTURE_2D,
                              mp_process_pipeline_buffer_get_texture_id(
                                      current_preview_buffer));
                glUniform1i(blit_uniform_texture, 0);
                check_gl();

                gl_util_bind_quad(quad);
                gl_util_draw_quad(quad);
        }

        if (zbar_result) {
                GLuint buffer;
                if (!gtk_gl_area_get_use_es(area)) {
                        glGenBuffers(1, &buffer);
                        glBindBuffer(GL_ARRAY_BUFFER, buffer);
                        check_gl();
                }

                glUseProgram(solid_program);
                glEnable(GL_BLEND);
                glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

                glUniform4f(solid_uniform_color, 1, 0, 0, 0.5);

                for (uint8_t i = 0; i < zbar_result->size; ++i) {
                        MPZBarCode *code = &zbar_result->codes[i];

                        GLfloat vertices[] = {
                                code->bounds_x[0], code->bounds_y[0],
                                code->bounds_x[1], code->bounds_y[1],
                                code->bounds_x[3], code->bounds_y[3],
                                code->bounds_x[2], code->bounds_y[2],
                        };

                        for (int i = 0; i < 4; ++i) {
                                vertices[i * 2] =
                                        2 * vertices[i * 2] / preview_buffer_width -
                                        1.0;
                                vertices[i * 2 + 1] =
                                        1.0 - 2 * vertices[i * 2 + 1] /
                                                      preview_buffer_height;
                        }

                        if (gtk_gl_area_get_use_es(area)) {
                                glVertexAttribPointer(GL_UTIL_VERTEX_ATTRIBUTE,
                                                      2,
                                                      GL_FLOAT,
                                                      0,
                                                      0,
                                                      vertices);
                                check_gl();
                                glEnableVertexAttribArray(GL_UTIL_VERTEX_ATTRIBUTE);
                                check_gl();
                        } else {
                                glBufferData(GL_ARRAY_BUFFER,
                                             sizeof(vertices),
                                             vertices,
                                             GL_STREAM_DRAW);
                                check_gl();

                                glVertexAttribPointer(GL_UTIL_VERTEX_ATTRIBUTE,
                                                      2,
                                                      GL_FLOAT,
                                                      GL_FALSE,
                                                      0,
                                                      0);
                                glEnableVertexAttribArray(GL_UTIL_VERTEX_ATTRIBUTE);
                                check_gl();
                        }

                        glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
                        check_gl();
                }

                glDisable(GL_BLEND);
                glBindBuffer(GL_ARRAY_BUFFER, 0);
        }

        glFlush();

#ifdef RENDERDOC
        if (rdoc_api) {
                rdoc_api->EndFrameCapture(NULL, NULL);
        }
#endif

        return FALSE;
}

static gboolean
preview_resize(GtkWidget *widget, int width, int height, gpointer data)
{
        if (preview_width != width || preview_height != height) {
                preview_width = width;
                preview_height = height;
                update_io_pipeline();
        }

        return TRUE;
}

void
run_open_last_action(GSimpleAction *action, GVariant *param, gpointer user_data)
{
        char uri[275];
        GError *error = NULL;

        if (strlen(last_path) == 0) {
                return;
        }
        sprintf(uri, "file://%s", last_path);
        if (!g_app_info_launch_default_for_uri(uri, NULL, &error)) {
                g_printerr("Could not launch image viewer for '%s': %s\n",
                           uri,
                           error->message);
                g_error_free(error);
        }
}

void
run_open_photos_action(GSimpleAction *action, GVariant *param, gpointer user_data)
{
        char uri[270];
        GError *error = NULL;
        sprintf(uri, "file://%s", g_get_user_special_dir(G_USER_DIRECTORY_PICTURES));
        if (!g_app_info_launch_default_for_uri(uri, NULL, &error)) {
                g_printerr("Could not launch image viewer: %s\n", error->message);
                g_error_free(error);
        }
}

void
run_capture_action(GSimpleAction *action, GVariant *param, gpointer user_data)
{
        gtk_spinner_start(GTK_SPINNER(process_spinner));
        gtk_stack_set_visible_child(GTK_STACK(open_last_stack), process_spinner);
        mp_io_pipeline_capture();
}

void
run_about_action(GSimpleAction *action, GVariant *param, GApplication *app)
{
        gtk_show_about_dialog(NULL,
                              "program-name",
                              "Megapixels",
                              "title",
                              "Megapixels",
                              "logo-icon-name",
                              "org.postmarketos.Megapixels",
                              "comments",
                              "The postmarketOS camera application",
                              "website",
                              "https://sr.ht/~martijnbraam/megapixels",
                              "version",
                              VERSION,
                              "license-type",
                              GTK_LICENSE_GPL_3_0_ONLY,
                              NULL);
}

void
run_quit_action(GSimpleAction *action, GVariant *param, GApplication *app)
{
        g_application_quit(app);
}

static bool
check_point_inside_bounds(int x, int y, int *bounds_x, int *bounds_y)
{
        bool right = false, left = false, top = false, bottom = false;

        for (int i = 0; i < 4; ++i) {
                if (x <= bounds_x[i])
                        left = true;
                if (x >= bounds_x[i])
                        right = true;
                if (y <= bounds_y[i])
                        top = true;
                if (y >= bounds_y[i])
                        bottom = true;
        }

        return right && left && top && bottom;
}

static void
on_zbar_dialog_response(GtkDialog *dialog, int response, char *data)
{
        GError *error = NULL;
        switch (response) {
        case GTK_RESPONSE_YES:
                if (!g_app_info_launch_default_for_uri(data, NULL, &error)) {
                        g_printerr("Could not launch application: %s\n",
                                   error->message);
                        g_error_free(error);
                }
        case GTK_RESPONSE_ACCEPT: {
                GdkDisplay *display = gtk_widget_get_display(GTK_WIDGET(dialog));
                gdk_clipboard_set_text(gdk_display_get_clipboard(display), data);
        }
        case GTK_RESPONSE_CANCEL:
                break;
        default:
                g_printerr("Wrong dialog response: %d\n", response);
        }

        g_free(data);
        gtk_window_destroy(GTK_WINDOW(dialog));
}

static void
on_zbar_code_tapped(GtkWidget *widget, const MPZBarCode *code)
{
        GtkWidget *dialog;
        GtkDialogFlags flags = GTK_DIALOG_MODAL | GTK_DIALOG_DESTROY_WITH_PARENT;
        bool data_is_url =
                g_uri_is_valid(code->data, G_URI_FLAGS_PARSE_RELAXED, NULL);

        char *data = strdup(code->data);

        if (data_is_url) {
                dialog = gtk_message_dialog_new(
                        GTK_WINDOW(gtk_widget_get_root(widget)),
                        flags,
                        GTK_MESSAGE_QUESTION,
                        GTK_BUTTONS_NONE,
                        "Found a URL '%s' encoded in a %s.",
                        code->data,
                        code->type);
                gtk_dialog_add_buttons(
                        GTK_DIALOG(dialog), "_Open URL", GTK_RESPONSE_YES, NULL);
        } else {
                dialog = gtk_message_dialog_new(
                        GTK_WINDOW(gtk_widget_get_root(widget)),
                        flags,
                        GTK_MESSAGE_QUESTION,
                        GTK_BUTTONS_NONE,
                        "Found data encoded in a %s.",
                        code->type);
                gtk_message_dialog_format_secondary_markup(
                        GTK_MESSAGE_DIALOG(dialog), "<small>%s</small>", code->data);
        }
        gtk_dialog_add_buttons(GTK_DIALOG(dialog),
                               "_Copy",
                               GTK_RESPONSE_ACCEPT,
                               "_Cancel",
                               GTK_RESPONSE_CANCEL,
                               NULL);

        g_signal_connect(
                dialog, "response", G_CALLBACK(on_zbar_dialog_response), data);

        gtk_widget_show(GTK_WIDGET(dialog));
}

static void
preview_pressed(GtkGestureClick *gesture, int n_press, double x, double y)
{
        GtkWidget *widget =
                gtk_event_controller_get_widget(GTK_EVENT_CONTROLLER(gesture));
        int scale_factor = gtk_widget_get_scale_factor(widget);

        // Tapped zbar result
        if (zbar_result) {
                // Transform the event coordinates to the image
                float offset_x, offset_y, size_x, size_y;
                position_preview(&offset_x, &offset_y, &size_x, &size_y);

                int zbar_x = (x - offset_x) * scale_factor / size_x *
                             preview_buffer_width;
                int zbar_y = (y - offset_y) * scale_factor / size_y *
                             preview_buffer_height;

                for (uint8_t i = 0; i < zbar_result->size; ++i) {
                        MPZBarCode *code = &zbar_result->codes[i];

                        if (check_point_inside_bounds(zbar_x,
                                                      zbar_y,
                                                      code->bounds_x,
                                                      code->bounds_y)) {
                                on_zbar_code_tapped(widget, code);
                                return;
                        }
                }
        }

        // Tapped preview image itself, try focussing
        if (has_auto_focus_start) {
                mp_io_pipeline_focus();
        }
}

static void
run_camera_switch_action(GSimpleAction *action, GVariant *param, gpointer user_data)
{
        size_t next_index = camera->index + 1;
        const struct mp_camera_config *next_camera =
                mp_get_camera_config(next_index);

        if (!next_camera) {
                next_index = 0;
                next_camera = mp_get_camera_config(next_index);
        }

        camera = next_camera;
        update_io_pipeline();
}

static void
run_open_settings_action(GSimpleAction *action, GVariant *param, gpointer user_data)
{
        gtk_stack_set_visible_child_name(GTK_STACK(main_stack), "settings");
}

static void
run_close_settings_action(GSimpleAction *action, GVariant *param, gpointer user_data)
{
        gtk_stack_set_visible_child_name(GTK_STACK(main_stack), "main");

        // Update settings
        bool save_dng = g_settings_get_boolean(settings, "save-raw");

        if (save_dng != setting_save_dng) {
                setting_save_dng = save_dng;
                update_io_pipeline();
        }
}

static void
on_controls_scale_changed(GtkAdjustment *adjustment, void (*set_fn)(double))
{
        set_fn(gtk_adjustment_get_value(adjustment));
}

static void
update_value(GtkAdjustment *adjustment, GtkLabel *label)
{
        char buf[12];
        snprintf(buf, 12, "%.0f", gtk_adjustment_get_value(adjustment));
        gtk_label_set_label(label, buf);
}

static void
on_auto_controls_toggled(GtkToggleButton *button, void (*set_auto_fn)(bool))
{
        set_auto_fn(gtk_toggle_button_get_active(button));
}

static void
update_scale(GtkToggleButton *button, GtkScale *scale)
{
        gtk_widget_set_sensitive(GTK_WIDGET(scale),
                                 !gtk_toggle_button_get_active(button));
}

static void
open_controls(GtkWidget *parent,
              const char *title_name,
              double min_value,
              double max_value,
              double current,
              bool auto_enabled,
              void (*set_fn)(double),
              void (*set_auto_fn)(bool))
{
        GtkBuilder *builder = gtk_builder_new_from_resource(
                "/org/postmarketos/Megapixels/controls-popover.ui");
        GtkPopover *popover =
                GTK_POPOVER(gtk_builder_get_object(builder, "controls"));
        GtkScale *scale = GTK_SCALE(gtk_builder_get_object(builder, "scale"));
        GtkLabel *title = GTK_LABEL(gtk_builder_get_object(builder, "title"));
        GtkLabel *value_label =
                GTK_LABEL(gtk_builder_get_object(builder, "value-label"));
        GtkToggleButton *auto_button =
                GTK_TOGGLE_BUTTON(gtk_builder_get_object(builder, "auto-button"));

        gtk_label_set_label(title, title_name);

        GtkAdjustment *adjustment = gtk_range_get_adjustment(GTK_RANGE(scale));
        gtk_adjustment_set_lower(adjustment, min_value);
        gtk_adjustment_set_upper(adjustment, max_value);
        gtk_adjustment_set_value(adjustment, current);
        update_value(adjustment, value_label);

        gtk_toggle_button_set_active(auto_button, auto_enabled);
        update_scale(auto_button, scale);

        g_signal_connect(adjustment,
                         "value-changed",
                         G_CALLBACK(on_controls_scale_changed),
                         set_fn);
        g_signal_connect(
                adjustment, "value-changed", G_CALLBACK(update_value), value_label);
        g_signal_connect(auto_button,
                         "toggled",
                         G_CALLBACK(on_auto_controls_toggled),
                         set_auto_fn);
        g_signal_connect(auto_button, "toggled", G_CALLBACK(update_scale), scale);

        gtk_widget_set_parent(GTK_WIDGET(popover), parent);
        gtk_popover_popup(popover);
        // g_object_unref(popover);
}

static void
set_gain(double value)
{
        if (gain != (int)value) {
                gain = value;
                update_io_pipeline();
        }
}

static void
set_gain_auto(bool is_auto)
{
        if (gain_is_manual != !is_auto) {
                gain_is_manual = !is_auto;
                update_io_pipeline();
        }
}

static void
open_iso_controls(GtkWidget *button, gpointer user_data)
{
        open_controls(button,
                      "ISO",
                      0,
                      gain_max,
                      gain,
                      !gain_is_manual,
                      set_gain,
                      set_gain_auto);
}

static void
set_shutter(double value)
{
        int new_exposure = (int)(value / 360.0 * camera->capture_mode.height);
        if (new_exposure != exposure) {
                exposure = new_exposure;
                update_io_pipeline();
        }
}

static void
set_shutter_auto(bool is_auto)
{
        if (exposure_is_manual != !is_auto) {
                exposure_is_manual = !is_auto;
                update_io_pipeline();
        }
}

static void
open_shutter_controls(GtkWidget *button, gpointer user_data)
{
        open_controls(button,
                      "Shutter",
                      1.0,
                      360.0,
                      exposure,
                      !exposure_is_manual,
                      set_shutter,
                      set_shutter_auto);
}

static void
flash_button_clicked(GtkWidget *button, gpointer user_data)
{
        flash_enabled = !flash_enabled;
        update_io_pipeline();

        const char *icon_name =
                flash_enabled ? "flash-enabled-symbolic" : "flash-disabled-symbolic";
        gtk_button_set_icon_name(GTK_BUTTON(button), icon_name);
}

static void
on_realize(GtkWidget *window, gpointer *data)
{
        GtkNative *native = gtk_widget_get_native(window);
        mp_process_pipeline_init_gl(gtk_native_get_surface(native));

        camera = mp_get_camera_config(0);
        update_io_pipeline();
}

static GSimpleAction *
create_simple_action(GtkApplication *app, const char *name, GCallback callback)
{
        GSimpleAction *action = g_simple_action_new(name, NULL);
        g_signal_connect(action, "activate", callback, app);
        g_action_map_add_action(G_ACTION_MAP(app), G_ACTION(action));
        return action;
}

static void
update_ui_rotation()
{
        if (device_rotation == 0 || device_rotation == 180) {
                // Portrait
                gtk_widget_set_halign(preview_top_box, GTK_ALIGN_FILL);
                gtk_orientable_set_orientation(GTK_ORIENTABLE(preview_top_box),
                                               GTK_ORIENTATION_VERTICAL);

                gtk_widget_set_halign(preview_bottom_box, GTK_ALIGN_FILL);
                gtk_orientable_set_orientation(GTK_ORIENTABLE(preview_bottom_box),
                                               GTK_ORIENTATION_HORIZONTAL);

                if (device_rotation == 0) {
                        gtk_widget_set_valign(preview_top_box, GTK_ALIGN_START);
                        gtk_widget_set_valign(preview_bottom_box, GTK_ALIGN_END);
                } else {
                        gtk_widget_set_valign(preview_top_box, GTK_ALIGN_END);
                        gtk_widget_set_valign(preview_bottom_box, GTK_ALIGN_START);
                }
        } else {
                // Landscape
                gtk_widget_set_valign(preview_top_box, GTK_ALIGN_FILL);
                gtk_orientable_set_orientation(GTK_ORIENTABLE(preview_top_box),
                                               GTK_ORIENTATION_HORIZONTAL);

                gtk_widget_set_valign(preview_bottom_box, GTK_ALIGN_FILL);
                gtk_orientable_set_orientation(GTK_ORIENTABLE(preview_bottom_box),
                                               GTK_ORIENTATION_VERTICAL);

                if (device_rotation == 90) {
                        gtk_widget_set_halign(preview_top_box, GTK_ALIGN_END);
                        gtk_widget_set_halign(preview_bottom_box, GTK_ALIGN_START);
                } else {
                        gtk_widget_set_halign(preview_top_box, GTK_ALIGN_START);
                        gtk_widget_set_halign(preview_bottom_box, GTK_ALIGN_END);
                }
        }
}

static void
display_config_received(GDBusConnection *conn, GAsyncResult *res, gpointer user_data)
{
        GError *error = NULL;
        GVariant *result = g_dbus_connection_call_finish(conn, res, &error);

        if (!result) {
                printf("Failed to get display configuration: %s\n", error->message);
                g_error_free(error);
                return;
        }

        GVariant *configs = g_variant_get_child_value(result, 1);
        if (g_variant_n_children(configs) == 0) {
                return;
        }

        GVariant *config = g_variant_get_child_value(configs, 0);
        GVariant *rot_config = g_variant_get_child_value(config, 7);
        uint32_t rotation_index = g_variant_get_uint32(rot_config);

        assert(rotation_index < 4);
        int new_rotation = rotation_index * 90;

        if (new_rotation != device_rotation) {
                device_rotation = new_rotation;
                update_io_pipeline();
                update_ui_rotation();
        }

        g_variant_unref(result);
}

static void
update_screen_rotation(GDBusConnection *conn)
{
        g_dbus_connection_call(conn,
                               "org.gnome.Mutter.DisplayConfig",
                               "/org/gnome/Mutter/DisplayConfig",
                               "org.gnome.Mutter.DisplayConfig",
                               "GetResources",
                               NULL,
                               NULL,
                               G_DBUS_CALL_FLAGS_NO_AUTO_START,
                               -1,
                               NULL,
                               (GAsyncReadyCallback)display_config_received,
                               NULL);
}

static void
on_screen_rotate(GDBusConnection *conn,
                 const gchar *sender_name,
                 const gchar *object_path,
                 const gchar *interface_name,
                 const gchar *signal_name,
                 GVariant *parameters,
                 gpointer user_data)
{
        update_screen_rotation(conn);
}

static void
activate(GtkApplication *app, gpointer data)
{
        g_object_set(gtk_settings_get_default(),
                     "gtk-application-prefer-dark-theme",
                     TRUE,
                     NULL);

        GdkDisplay *display = gdk_display_get_default();
        GtkIconTheme *icon_theme = gtk_icon_theme_get_for_display(display);
        gtk_icon_theme_add_resource_path(icon_theme, "/org/postmarketos/Megapixels");

        GtkCssProvider *provider = gtk_css_provider_new();
        gtk_css_provider_load_from_resource(
                provider, "/org/postmarketos/Megapixels/camera.css");
        gtk_style_context_add_provider_for_display(
                display,
                GTK_STYLE_PROVIDER(provider),
                GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);

        GtkBuilder *builder = gtk_builder_new_from_resource(
                "/org/postmarketos/Megapixels/camera.ui");

        GtkWidget *window = GTK_WIDGET(gtk_builder_get_object(builder, "window"));
        GtkWidget *iso_button =
                GTK_WIDGET(gtk_builder_get_object(builder, "iso-controls-button"));
        GtkWidget *shutter_button = GTK_WIDGET(
                gtk_builder_get_object(builder, "shutter-controls-button"));
        flash_button =
                GTK_WIDGET(gtk_builder_get_object(builder, "flash-controls-button"));
        GtkWidget *setting_dng_button =
                GTK_WIDGET(gtk_builder_get_object(builder, "setting-raw"));
        preview = GTK_WIDGET(gtk_builder_get_object(builder, "preview"));
        main_stack = GTK_WIDGET(gtk_builder_get_object(builder, "main_stack"));
        open_last_stack =
                GTK_WIDGET(gtk_builder_get_object(builder, "open_last_stack"));
        thumb_last = GTK_WIDGET(gtk_builder_get_object(builder, "thumb_last"));
        process_spinner =
                GTK_WIDGET(gtk_builder_get_object(builder, "process_spinner"));
        scanned_codes = GTK_WIDGET(gtk_builder_get_object(builder, "scanned-codes"));
        preview_top_box = GTK_WIDGET(gtk_builder_get_object(builder, "top-box"));
        preview_bottom_box =
                GTK_WIDGET(gtk_builder_get_object(builder, "bottom-box"));

        g_signal_connect(window, "realize", G_CALLBACK(on_realize), NULL);

        g_signal_connect(preview, "realize", G_CALLBACK(preview_realize), NULL);
        g_signal_connect(preview, "render", G_CALLBACK(preview_draw), NULL);
        g_signal_connect(preview, "resize", G_CALLBACK(preview_resize), NULL);
        GtkGesture *click = gtk_gesture_click_new();
        g_signal_connect(click, "pressed", G_CALLBACK(preview_pressed), NULL);
        gtk_widget_add_controller(preview, GTK_EVENT_CONTROLLER(click));

        g_signal_connect(iso_button, "clicked", G_CALLBACK(open_iso_controls), NULL);
        g_signal_connect(
                shutter_button, "clicked", G_CALLBACK(open_shutter_controls), NULL);
        g_signal_connect(
                flash_button, "clicked", G_CALLBACK(flash_button_clicked), NULL);

        // Setup actions
        create_simple_action(app, "capture", G_CALLBACK(run_capture_action));
        create_simple_action(
                app, "switch-camera", G_CALLBACK(run_camera_switch_action));
        create_simple_action(
                app, "open-settings", G_CALLBACK(run_open_settings_action));
        create_simple_action(
                app, "close-settings", G_CALLBACK(run_close_settings_action));
        create_simple_action(app, "open-last", G_CALLBACK(run_open_last_action));
        create_simple_action(app, "open-photos", G_CALLBACK(run_open_photos_action));
        create_simple_action(app, "about", G_CALLBACK(run_about_action));
        create_simple_action(app, "quit", G_CALLBACK(run_quit_action));

        // Setup shortcuts
        const char *capture_accels[] = { "space", NULL };
        gtk_application_set_accels_for_action(app, "app.capture", capture_accels);

        const char *quit_accels[] = { "<Ctrl>q", "<Ctrl>w", NULL };
        gtk_application_set_accels_for_action(app, "app.quit", quit_accels);

        // Setup settings
        settings = g_settings_new("org.postmarketos.Megapixels");
        g_settings_bind(settings,
                        "save-raw",
                        setting_dng_button,
                        "active",
                        G_SETTINGS_BIND_DEFAULT);

        setting_save_dng = g_settings_get_boolean(settings, "save-raw");

        // Listen for phosh rotation
        GDBusConnection *conn =
                g_application_get_dbus_connection(G_APPLICATION(app));
        g_dbus_connection_signal_subscribe(conn,
                                           NULL,
                                           "org.gnome.Mutter.DisplayConfig",
                                           "MonitorsChanged",
                                           "/org/gnome/Mutter/DisplayConfig",
                                           NULL,
                                           G_DBUS_SIGNAL_FLAGS_NONE,
                                           &on_screen_rotate,
                                           NULL,
                                           NULL);
        update_screen_rotation(conn);

        // Initialize display flash
        mp_flash_gtk_init(conn);

        mp_io_pipeline_start();

        gtk_application_add_window(app, GTK_WINDOW(window));
        gtk_widget_show(window);
}

static void
shutdown(GApplication *app, gpointer data)
{
        // Only do cleanup in development, let the OS clean up otherwise
#ifdef DEBUG
        mp_io_pipeline_stop();
        mp_flash_gtk_clean();
#endif
}

int
main(int argc, char *argv[])
{
#ifdef RENDERDOC
        {
                void *mod = dlopen("librenderdoc.so", RTLD_NOW | RTLD_NOLOAD);
                if (mod) {
                        pRENDERDOC_GetAPI RENDERDOC_GetAPI =
                                (pRENDERDOC_GetAPI)dlsym(mod, "RENDERDOC_GetAPI");
                        int ret = RENDERDOC_GetAPI(eRENDERDOC_API_Version_1_1_2,
                                                   (void **)&rdoc_api);
                        assert(ret == 1);
                } else {
                        printf("Renderdoc not found\n");
                }
        }
#endif

        if (!mp_load_config())
                return 1;

        setenv("LC_NUMERIC", "C", 1);

        GtkApplication *app = gtk_application_new("org.postmarketos.Megapixels", 0);

        g_signal_connect(app, "activate", G_CALLBACK(activate), NULL);
        g_signal_connect(app, "shutdown", G_CALLBACK(shutdown), NULL);

        g_application_run(G_APPLICATION(app), argc, argv);

        return 0;
}