screen_ui.cpp - platform/bootable/recovery - Git at Google

 /*
  * Copyright (C) 2011 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include <errno.h>
 #include <fcntl.h>
 #include <linux/input.h>
 #include <pthread.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/stat.h>
 #include <sys/time.h>
 #include <sys/types.h>
 #include <time.h>
 #include <unistd.h>

 #include "common.h"
 #include <cutils/android_reboot.h>
 #include "minui/minui.h"
 #include "ui.h"
 #include "screen_ui.h"
 #include "device.h"

 #define CHAR_WIDTH 10
 #define CHAR_HEIGHT 18

 #define UI_WAIT_KEY_TIMEOUT_SEC    120

 UIParameters ui_parameters = {
     6,       // indeterminate progress bar frames
     20,      // fps
     7,       // installation icon frames (0 == static image)
     13, 190, // installation icon overlay offset
 };

 // There's only (at most) one of these objects, and global callbacks
 // (for pthread_create, and the input event system) need to find it,
 // so use a global variable.
 static ScreenRecoveryUI* self = NULL;

 // Return the current time as a double (including fractions of a second).
 static double now() {
     struct timeval tv;
     gettimeofday(&tv, NULL);
     return tv.tv_sec + tv.tv_usec / 1000000.0;
 }

 ScreenRecoveryUI::ScreenRecoveryUI() :
     currentIcon(NONE),
     installingFrame(0),
     progressBarType(EMPTY),
     progressScopeStart(0),
     progressScopeSize(0),
     progress(0),
     pagesIdentical(false),
     text_cols(0),
     text_rows(0),
     text_col(0),
     text_row(0),
     text_top(0),
     show_text(false),
     show_text_ever(false),
     show_menu(false),
     menu_top(0),
     menu_items(0),
     menu_sel(0),
     key_queue_len(0),
     key_last_down(-1) {
     pthread_mutex_init(&updateMutex, NULL);
     pthread_mutex_init(&key_queue_mutex, NULL);
     pthread_cond_init(&key_queue_cond, NULL);
     self = this;
 }

 // Draw the given frame over the installation overlay animation.  The
 // background is not cleared or draw with the base icon first; we
 // assume that the frame already contains some other frame of the
 // animation.  Does nothing if no overlay animation is defined.
 // Should only be called with updateMutex locked.
 void ScreenRecoveryUI::draw_install_overlay_locked(int frame) {
     if (installationOverlay == NULL) return;
     gr_surface surface = installationOverlay[frame];
     int iconWidth = gr_get_width(surface);
     int iconHeight = gr_get_height(surface);
     gr_blit(surface, 0, 0, iconWidth, iconHeight,
             ui_parameters.install_overlay_offset_x,
             ui_parameters.install_overlay_offset_y);
 }

 // Clear the screen and draw the currently selected background icon (if any).
 // Should only be called with updateMutex locked.
 void ScreenRecoveryUI::draw_background_locked(Icon icon)
 {
     pagesIdentical = false;
     gr_color(0, 0, 0, 255);
     gr_fill(0, 0, gr_fb_width(), gr_fb_height());

     if (icon) {
         gr_surface surface = backgroundIcon[icon];
         int iconWidth = gr_get_width(surface);
         int iconHeight = gr_get_height(surface);
         int iconX = (gr_fb_width() - iconWidth) / 2;
         int iconY = (gr_fb_height() - iconHeight) / 2;
         gr_blit(surface, 0, 0, iconWidth, iconHeight, iconX, iconY);
         if (icon == INSTALLING) {
             draw_install_overlay_locked(installingFrame);
         }
     }
 }

 // Draw the progress bar (if any) on the screen.  Does not flip pages.
 // Should only be called with updateMutex locked.
 void ScreenRecoveryUI::draw_progress_locked()
 {
     if (currentIcon == INSTALLING) {
         draw_install_overlay_locked(installingFrame);
     }

     if (progressBarType != EMPTY) {
         int iconHeight = gr_get_height(backgroundIcon[INSTALLING]);
         int width = gr_get_width(progressBarEmpty);
         int height = gr_get_height(progressBarEmpty);

         int dx = (gr_fb_width() - width)/2;
         int dy = (3*gr_fb_height() + iconHeight - 2*height)/4;

         // Erase behind the progress bar (in case this was a progress-only update)
         gr_color(0, 0, 0, 255);
         gr_fill(dx, dy, width, height);

         if (progressBarType == DETERMINATE) {
             float p = progressScopeStart + progress * progressScopeSize;
             int pos = (int) (p * width);

             if (pos > 0) {
                 gr_blit(progressBarFill, 0, 0, pos, height, dx, dy);
             }
             if (pos < width-1) {
                 gr_blit(progressBarEmpty, pos, 0, width-pos, height, dx+pos, dy);
             }
         }

         if (progressBarType == INDETERMINATE) {
             static int frame = 0;
             gr_blit(progressBarIndeterminate[frame], 0, 0, width, height, dx, dy);
             frame = (frame + 1) % ui_parameters.indeterminate_frames;
         }
     }
 }

 void ScreenRecoveryUI::draw_text_line(int row, const char* t) {
   if (t[0] != '\0') {
     gr_text(0, (row+1)*CHAR_HEIGHT-1, t);
   }
 }

 // Redraw everything on the screen.  Does not flip pages.
 // Should only be called with updateMutex locked.
 void ScreenRecoveryUI::draw_screen_locked()
 {
     draw_background_locked(currentIcon);
     draw_progress_locked();

     if (show_text) {
         gr_color(0, 0, 0, 160);
         gr_fill(0, 0, gr_fb_width(), gr_fb_height());

         int i = 0;
         if (show_menu) {
             gr_color(64, 96, 255, 255);
             gr_fill(0, (menu_top+menu_sel) * CHAR_HEIGHT,
                     gr_fb_width(), (menu_top+menu_sel+1)*CHAR_HEIGHT+1);

             for (; i < menu_top + menu_items; ++i) {
                 if (i == menu_top + menu_sel) {
                     gr_color(255, 255, 255, 255);
                     draw_text_line(i, menu[i]);
                     gr_color(64, 96, 255, 255);
                 } else {
                     draw_text_line(i, menu[i]);
                 }
             }
             gr_fill(0, i*CHAR_HEIGHT+CHAR_HEIGHT/2-1,
                     gr_fb_width(), i*CHAR_HEIGHT+CHAR_HEIGHT/2+1);
             ++i;
         }

         gr_color(255, 255, 0, 255);

         for (; i < text_rows; ++i) {
             draw_text_line(i, text[(i+text_top) % text_rows]);
         }
     }
 }

 // Redraw everything on the screen and flip the screen (make it visible).
 // Should only be called with updateMutex locked.
 void ScreenRecoveryUI::update_screen_locked()
 {
     draw_screen_locked();
     gr_flip();
 }

 // Updates only the progress bar, if possible, otherwise redraws the screen.
 // Should only be called with updateMutex locked.
 void ScreenRecoveryUI::update_progress_locked()
 {
     if (show_text || !pagesIdentical) {
         draw_screen_locked();    // Must redraw the whole screen
         pagesIdentical = true;
     } else {
         draw_progress_locked();  // Draw only the progress bar and overlays
     }
     gr_flip();
 }

 // Keeps the progress bar updated, even when the process is otherwise busy.
 void* ScreenRecoveryUI::progress_thread(void *cookie)
 {
     double interval = 1.0 / ui_parameters.update_fps;
     for (;;) {
         double start = now();
         pthread_mutex_lock(&self->updateMutex);

         int redraw = 0;

         // update the installation animation, if active
         // skip this if we have a text overlay (too expensive to update)
         if (self->currentIcon == INSTALLING &&
             ui_parameters.installing_frames > 0 &&
             !self->show_text) {
             self->installingFrame =
                 (self->installingFrame + 1) % ui_parameters.installing_frames;
             redraw = 1;
         }

         // update the progress bar animation, if active
         // skip this if we have a text overlay (too expensive to update)
         if (self->progressBarType == INDETERMINATE && !self->show_text) {
             redraw = 1;
         }

         // move the progress bar forward on timed intervals, if configured
         int duration = self->progressScopeDuration;
         if (self->progressBarType == DETERMINATE && duration > 0) {
             double elapsed = now() - self->progressScopeTime;
             float progress = 1.0 * elapsed / duration;
             if (progress > 1.0) progress = 1.0;
             if (progress > progress) {
                 progress = progress;
                 redraw = 1;
             }
         }

         if (redraw) self->update_progress_locked();

         pthread_mutex_unlock(&self->updateMutex);
         double end = now();
         // minimum of 20ms delay between frames
         double delay = interval - (end-start);
         if (delay < 0.02) delay = 0.02;
         usleep((long)(delay * 1000000));
     }
     return NULL;
 }

 int ScreenRecoveryUI::input_callback(int fd, short revents, void* data)
 {
     struct input_event ev;
     int ret;

     ret = ev_get_input(fd, revents, &ev);
     if (ret)
         return -1;

     if (ev.type == EV_SYN) {
         return 0;
     } else if (ev.type == EV_REL) {
         if (ev.code == REL_Y) {
             // accumulate the up or down motion reported by
             // the trackball.  When it exceeds a threshold
             // (positive or negative), fake an up/down
             // key event.
             self->rel_sum += ev.value;
             if (self->rel_sum > 3) {
                 self->process_key(KEY_DOWN, 1);   // press down key
                 self->process_key(KEY_DOWN, 0);   // and release it
                 self->rel_sum = 0;
             } else if (self->rel_sum < -3) {
                 self->process_key(KEY_UP, 1);     // press up key
                 self->process_key(KEY_UP, 0);     // and release it
                 self->rel_sum = 0;
             }
         }
     } else {
         self->rel_sum = 0;
     }

     if (ev.type == EV_KEY && ev.code <= KEY_MAX)
         self->process_key(ev.code, ev.value);

     return 0;
 }

 // Process a key-up or -down event.  A key is "registered" when it is
 // pressed and then released, with no other keypresses or releases in
 // between.  Registered keys are passed to CheckKey() to see if it
 // should trigger a visibility toggle, an immediate reboot, or be
 // queued to be processed next time the foreground thread wants a key
 // (eg, for the menu).
 //
 // We also keep track of which keys are currently down so that
 // CheckKey can call IsKeyPressed to see what other keys are held when
 // a key is registered.
 //
 // updown == 1 for key down events; 0 for key up events
 void ScreenRecoveryUI::process_key(int key_code, int updown) {
     bool register_key = false;

     pthread_mutex_lock(&key_queue_mutex);
     key_pressed[key_code] = updown;
     if (updown) {
         key_last_down = key_code;
     } else {
         if (key_last_down == key_code)
             register_key = true;
         key_last_down = -1;
     }
     pthread_mutex_unlock(&key_queue_mutex);

     if (register_key) {
         switch (CheckKey(key_code)) {
           case RecoveryUI::TOGGLE:
             pthread_mutex_lock(&updateMutex);
             show_text = !show_text;
             if (show_text) show_text_ever = true;
             update_screen_locked();
             pthread_mutex_unlock(&updateMutex);
             break;

           case RecoveryUI::REBOOT:
             android_reboot(ANDROID_RB_RESTART, 0, 0);
             break;

           case RecoveryUI::ENQUEUE:
             pthread_mutex_lock(&key_queue_mutex);
             const int queue_max = sizeof(key_queue) / sizeof(key_queue[0]);
             if (key_queue_len < queue_max) {
                 key_queue[key_queue_len++] = key_code;
                 pthread_cond_signal(&key_queue_cond);
             }
             pthread_mutex_unlock(&key_queue_mutex);
             break;
         }
     }
 }

 // Reads input events, handles special hot keys, and adds to the key queue.
 void* ScreenRecoveryUI::input_thread(void *cookie)
 {
     for (;;) {
         if (!ev_wait(-1))
             ev_dispatch();
     }
     return NULL;
 }

 void ScreenRecoveryUI::LoadBitmap(const char* filename, gr_surface* surface) {
     int result = res_create_surface(filename, surface);
     if (result < 0) {
         LOGE("missing bitmap %s\n(Code %d)\n", filename, result);
     }
 }

 void ScreenRecoveryUI::Init()
 {
     gr_init();
     ev_init(input_callback, NULL);

     text_col = text_row = 0;
     text_rows = gr_fb_height() / CHAR_HEIGHT;
     if (text_rows > kMaxRows) text_rows = kMaxRows;
     text_top = 1;

     text_cols = gr_fb_width() / CHAR_WIDTH;
     if (text_cols > kMaxCols - 1) text_cols = kMaxCols - 1;

     LoadBitmap("icon_installing", &backgroundIcon[INSTALLING]);
     LoadBitmap("icon_error", &backgroundIcon[ERROR]);
     LoadBitmap("progress_empty", &progressBarEmpty);
     LoadBitmap("progress_fill", &progressBarFill);

     int i;

     progressBarIndeterminate = (gr_surface*)malloc(ui_parameters.indeterminate_frames *
                                                     sizeof(gr_surface));
     for (i = 0; i < ui_parameters.indeterminate_frames; ++i) {
         char filename[40];
         // "indeterminate01.png", "indeterminate02.png", ...
         sprintf(filename, "indeterminate%02d", i+1);
         LoadBitmap(filename, progressBarIndeterminate+i);
     }

     if (ui_parameters.installing_frames > 0) {
         installationOverlay = (gr_surface*)malloc(ui_parameters.installing_frames *
                                                    sizeof(gr_surface));
         for (i = 0; i < ui_parameters.installing_frames; ++i) {
             char filename[40];
             // "icon_installing_overlay01.png",
             // "icon_installing_overlay02.png", ...
             sprintf(filename, "icon_installing_overlay%02d", i+1);
             LoadBitmap(filename, installationOverlay+i);
         }

         // Adjust the offset to account for the positioning of the
         // base image on the screen.
         if (backgroundIcon[INSTALLING] != NULL) {
             gr_surface bg = backgroundIcon[INSTALLING];
             ui_parameters.install_overlay_offset_x +=
                 (gr_fb_width() - gr_get_width(bg)) / 2;
             ui_parameters.install_overlay_offset_y +=
                 (gr_fb_height() - gr_get_height(bg)) / 2;
         }
     } else {
         installationOverlay = NULL;
     }

     pthread_create(&progress_t, NULL, progress_thread, NULL);
     pthread_create(&input_t, NULL, input_thread, NULL);
 }

 void ScreenRecoveryUI::SetBackground(Icon icon)
 {
     pthread_mutex_lock(&updateMutex);
     currentIcon = icon;
     update_screen_locked();
     pthread_mutex_unlock(&updateMutex);
 }

 void ScreenRecoveryUI::SetProgressType(ProgressType type)
 {
     pthread_mutex_lock(&updateMutex);
     if (progressBarType != type) {
         progressBarType = type;
         update_progress_locked();
     }
     pthread_mutex_unlock(&updateMutex);
 }

 void ScreenRecoveryUI::ShowProgress(float portion, float seconds)
 {
     pthread_mutex_lock(&updateMutex);
     progressBarType = DETERMINATE;
     progressScopeStart += progressScopeSize;
     progressScopeSize = portion;
     progressScopeTime = now();
     progressScopeDuration = seconds;
     progress = 0;
     update_progress_locked();
     pthread_mutex_unlock(&updateMutex);
 }

 void ScreenRecoveryUI::SetProgress(float fraction)
 {
     pthread_mutex_lock(&updateMutex);
     if (fraction < 0.0) fraction = 0.0;
     if (fraction > 1.0) fraction = 1.0;
     if (progressBarType == DETERMINATE && fraction > progress) {
         // Skip updates that aren't visibly different.
         int width = gr_get_width(progressBarIndeterminate[0]);
         float scale = width * progressScopeSize;
         if ((int) (progress * scale) != (int) (fraction * scale)) {
             progress = fraction;
             update_progress_locked();
         }
     }
     pthread_mutex_unlock(&updateMutex);
 }

 void ScreenRecoveryUI::Print(const char *fmt, ...)
 {
     char buf[256];
     va_list ap;
     va_start(ap, fmt);
     vsnprintf(buf, 256, fmt, ap);
     va_end(ap);

     fputs(buf, stdout);

     // This can get called before ui_init(), so be careful.
     pthread_mutex_lock(&updateMutex);
     if (text_rows > 0 && text_cols > 0) {
         char *ptr;
         for (ptr = buf; *ptr != '\0'; ++ptr) {
             if (*ptr == '\n' || text_col >= text_cols) {
                 text[text_row][text_col] = '\0';
                 text_col = 0;
                 text_row = (text_row + 1) % text_rows;
                 if (text_row == text_top) text_top = (text_top + 1) % text_rows;
             }
             if (*ptr != '\n') text[text_row][text_col++] = *ptr;
         }
         text[text_row][text_col] = '\0';
         update_screen_locked();
     }
     pthread_mutex_unlock(&updateMutex);
 }

 void ScreenRecoveryUI::StartMenu(const char* const * headers, const char* const * items,
                                  int initial_selection) {
     int i;
     pthread_mutex_lock(&updateMutex);
     if (text_rows > 0 && text_cols > 0) {
         for (i = 0; i < text_rows; ++i) {
             if (headers[i] == NULL) break;
             strncpy(menu[i], headers[i], text_cols-1);
             menu[i][text_cols-1] = '\0';
         }
         menu_top = i;
         for (; i < text_rows; ++i) {
             if (items[i-menu_top] == NULL) break;
             strncpy(menu[i], items[i-menu_top], text_cols-1);
             menu[i][text_cols-1] = '\0';
         }
         menu_items = i - menu_top;
         show_menu = 1;
         menu_sel = initial_selection;
         update_screen_locked();
     }
     pthread_mutex_unlock(&updateMutex);
 }

 int ScreenRecoveryUI::SelectMenu(int sel) {
     int old_sel;
     pthread_mutex_lock(&updateMutex);
     if (show_menu > 0) {
         old_sel = menu_sel;
         menu_sel = sel;
         if (menu_sel < 0) menu_sel = 0;
         if (menu_sel >= menu_items) menu_sel = menu_items-1;
         sel = menu_sel;
         if (menu_sel != old_sel) update_screen_locked();
     }
     pthread_mutex_unlock(&updateMutex);
     return sel;
 }

 void ScreenRecoveryUI::EndMenu() {
     int i;
     pthread_mutex_lock(&updateMutex);
     if (show_menu > 0 && text_rows > 0 && text_cols > 0) {
         show_menu = 0;
         update_screen_locked();
     }
     pthread_mutex_unlock(&updateMutex);
 }

 bool ScreenRecoveryUI::IsTextVisible()
 {
     pthread_mutex_lock(&updateMutex);
     int visible = show_text;
     pthread_mutex_unlock(&updateMutex);
     return visible;
 }

 bool ScreenRecoveryUI::WasTextEverVisible()
 {
     pthread_mutex_lock(&updateMutex);
     int ever_visible = show_text_ever;
     pthread_mutex_unlock(&updateMutex);
     return ever_visible;
 }

 void ScreenRecoveryUI::ShowText(bool visible)
 {
     pthread_mutex_lock(&updateMutex);
     show_text = visible;
     if (show_text) show_text_ever = 1;
     update_screen_locked();
     pthread_mutex_unlock(&updateMutex);
 }

 // Return true if USB is connected.
 bool ScreenRecoveryUI::usb_connected() {
     int fd = open("/sys/class/android_usb/android0/state", O_RDONLY);
     if (fd < 0) {
         printf("failed to open /sys/class/android_usb/android0/state: %s\n",
                strerror(errno));
         return 0;
     }

     char buf;
     /* USB is connected if android_usb state is CONNECTED or CONFIGURED */
     int connected = (read(fd, &buf, 1) == 1) && (buf == 'C');
     if (close(fd) < 0) {
         printf("failed to close /sys/class/android_usb/android0/state: %s\n",
                strerror(errno));
     }
     return connected;
 }

 int ScreenRecoveryUI::WaitKey()
 {
     pthread_mutex_lock(&key_queue_mutex);

     // Time out after UI_WAIT_KEY_TIMEOUT_SEC, unless a USB cable is
     // plugged in.
     do {
         struct timeval now;
         struct timespec timeout;
         gettimeofday(&now, NULL);
         timeout.tv_sec = now.tv_sec;
         timeout.tv_nsec = now.tv_usec * 1000;
         timeout.tv_sec += UI_WAIT_KEY_TIMEOUT_SEC;

         int rc = 0;
         while (key_queue_len == 0 && rc != ETIMEDOUT) {
             rc = pthread_cond_timedwait(&key_queue_cond, &key_queue_mutex,
                                         &timeout);
         }
     } while (usb_connected() && key_queue_len == 0);

     int key = -1;
     if (key_queue_len > 0) {
         key = key_queue[0];
         memcpy(&key_queue[0], &key_queue[1], sizeof(int) * --key_queue_len);
     }
     pthread_mutex_unlock(&key_queue_mutex);
     return key;
 }

 bool ScreenRecoveryUI::IsKeyPressed(int key)
 {
     pthread_mutex_lock(&key_queue_mutex);
     int pressed = key_pressed[key];
     pthread_mutex_unlock(&key_queue_mutex);
     return pressed;
 }

 void ScreenRecoveryUI::FlushKeys() {
     pthread_mutex_lock(&key_queue_mutex);
     key_queue_len = 0;
     pthread_mutex_unlock(&key_queue_mutex);
 }

 RecoveryUI::KeyAction ScreenRecoveryUI::CheckKey(int key) {
     return RecoveryUI::ENQUEUE;
 }
	/*
	* Copyright (C) 2011 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include <errno.h>
	#include <fcntl.h>
	#include <linux/input.h>
	#include <pthread.h>
	#include <stdarg.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <sys/stat.h>
	#include <sys/time.h>
	#include <sys/types.h>
	#include <time.h>
	#include <unistd.h>

	#include "common.h"
	#include <cutils/android_reboot.h>
	#include "minui/minui.h"
	#include "ui.h"
	#include "screen_ui.h"
	#include "device.h"

	#define CHAR_WIDTH 10
	#define CHAR_HEIGHT 18

	#define UI_WAIT_KEY_TIMEOUT_SEC 120

	UIParameters ui_parameters = {
	6, // indeterminate progress bar frames
	20, // fps
	7, // installation icon frames (0 == static image)
	13, 190, // installation icon overlay offset
	};

	// There's only (at most) one of these objects, and global callbacks
	// (for pthread_create, and the input event system) need to find it,
	// so use a global variable.
	static ScreenRecoveryUI* self = NULL;

	// Return the current time as a double (including fractions of a second).
	static double now() {
	struct timeval tv;
	gettimeofday(&tv, NULL);
	return tv.tv_sec + tv.tv_usec / 1000000.0;
	}

	ScreenRecoveryUI::ScreenRecoveryUI() :
	currentIcon(NONE),
	installingFrame(0),
	progressBarType(EMPTY),
	progressScopeStart(0),
	progressScopeSize(0),
	progress(0),
	pagesIdentical(false),
	text_cols(0),
	text_rows(0),
	text_col(0),
	text_row(0),
	text_top(0),
	show_text(false),
	show_text_ever(false),
	show_menu(false),
	menu_top(0),
	menu_items(0),
	menu_sel(0),
	key_queue_len(0),
	key_last_down(-1) {
	pthread_mutex_init(&updateMutex, NULL);
	pthread_mutex_init(&key_queue_mutex, NULL);
	pthread_cond_init(&key_queue_cond, NULL);
	self = this;
	}

	// Draw the given frame over the installation overlay animation. The
	// background is not cleared or draw with the base icon first; we
	// assume that the frame already contains some other frame of the
	// animation. Does nothing if no overlay animation is defined.
	// Should only be called with updateMutex locked.
	void ScreenRecoveryUI::draw_install_overlay_locked(int frame) {
	if (installationOverlay == NULL) return;
	gr_surface surface = installationOverlay[frame];
	int iconWidth = gr_get_width(surface);
	int iconHeight = gr_get_height(surface);
	gr_blit(surface, 0, 0, iconWidth, iconHeight,
	ui_parameters.install_overlay_offset_x,
	ui_parameters.install_overlay_offset_y);
	}

	// Clear the screen and draw the currently selected background icon (if any).
	// Should only be called with updateMutex locked.
	void ScreenRecoveryUI::draw_background_locked(Icon icon)
	{
	pagesIdentical = false;
	gr_color(0, 0, 0, 255);
	gr_fill(0, 0, gr_fb_width(), gr_fb_height());

	if (icon) {
	gr_surface surface = backgroundIcon[icon];
	int iconWidth = gr_get_width(surface);
	int iconHeight = gr_get_height(surface);
	int iconX = (gr_fb_width() - iconWidth) / 2;
	int iconY = (gr_fb_height() - iconHeight) / 2;
	gr_blit(surface, 0, 0, iconWidth, iconHeight, iconX, iconY);
	if (icon == INSTALLING) {
	draw_install_overlay_locked(installingFrame);
	}
	}
	}

	// Draw the progress bar (if any) on the screen. Does not flip pages.
	// Should only be called with updateMutex locked.
	void ScreenRecoveryUI::draw_progress_locked()
	{
	if (currentIcon == INSTALLING) {
	draw_install_overlay_locked(installingFrame);
	}

	if (progressBarType != EMPTY) {
	int iconHeight = gr_get_height(backgroundIcon[INSTALLING]);
	int width = gr_get_width(progressBarEmpty);
	int height = gr_get_height(progressBarEmpty);

	int dx = (gr_fb_width() - width)/2;
	int dy = (3gr_fb_height() + iconHeight - 2height)/4;

	// Erase behind the progress bar (in case this was a progress-only update)
	gr_color(0, 0, 0, 255);
	gr_fill(dx, dy, width, height);

	if (progressBarType == DETERMINATE) {
	float p = progressScopeStart + progress * progressScopeSize;
	int pos = (int) (p * width);

	if (pos > 0) {
	gr_blit(progressBarFill, 0, 0, pos, height, dx, dy);
	}
	if (pos < width-1) {
	gr_blit(progressBarEmpty, pos, 0, width-pos, height, dx+pos, dy);
	}
	}

	if (progressBarType == INDETERMINATE) {
	static int frame = 0;
	gr_blit(progressBarIndeterminate[frame], 0, 0, width, height, dx, dy);
	frame = (frame + 1) % ui_parameters.indeterminate_frames;
	}
	}
	}

	void ScreenRecoveryUI::draw_text_line(int row, const char* t) {
	if (t[0] != '\0') {
	gr_text(0, (row+1)*CHAR_HEIGHT-1, t);
	}
	}

	// Redraw everything on the screen. Does not flip pages.
	// Should only be called with updateMutex locked.
	void ScreenRecoveryUI::draw_screen_locked()
	{
	draw_background_locked(currentIcon);
	draw_progress_locked();

	if (show_text) {
	gr_color(0, 0, 0, 160);
	gr_fill(0, 0, gr_fb_width(), gr_fb_height());

	int i = 0;
	if (show_menu) {
	gr_color(64, 96, 255, 255);
	gr_fill(0, (menu_top+menu_sel) * CHAR_HEIGHT,
	gr_fb_width(), (menu_top+menu_sel+1)*CHAR_HEIGHT+1);

	for (; i < menu_top + menu_items; ++i) {
	if (i == menu_top + menu_sel) {
	gr_color(255, 255, 255, 255);
	draw_text_line(i, menu[i]);
	gr_color(64, 96, 255, 255);
	} else {
	draw_text_line(i, menu[i]);
	}
	}
	gr_fill(0, i*CHAR_HEIGHT+CHAR_HEIGHT/2-1,
	gr_fb_width(), i*CHAR_HEIGHT+CHAR_HEIGHT/2+1);
	++i;
	}

	gr_color(255, 255, 0, 255);

	for (; i < text_rows; ++i) {
	draw_text_line(i, text[(i+text_top) % text_rows]);
	}
	}
	}

	// Redraw everything on the screen and flip the screen (make it visible).
	// Should only be called with updateMutex locked.
	void ScreenRecoveryUI::update_screen_locked()
	{
	draw_screen_locked();
	gr_flip();
	}

	// Updates only the progress bar, if possible, otherwise redraws the screen.
	// Should only be called with updateMutex locked.
	void ScreenRecoveryUI::update_progress_locked()
	{
	if (show_text \|\| !pagesIdentical) {
	draw_screen_locked(); // Must redraw the whole screen
	pagesIdentical = true;
	} else {
	draw_progress_locked(); // Draw only the progress bar and overlays
	}
	gr_flip();
	}

	// Keeps the progress bar updated, even when the process is otherwise busy.
	void* ScreenRecoveryUI::progress_thread(void *cookie)
	{
	double interval = 1.0 / ui_parameters.update_fps;
	for (;;) {
	double start = now();
	pthread_mutex_lock(&self->updateMutex);

	int redraw = 0;

	// update the installation animation, if active
	// skip this if we have a text overlay (too expensive to update)
	if (self->currentIcon == INSTALLING &&
	ui_parameters.installing_frames > 0 &&
	!self->show_text) {
	self->installingFrame =
	(self->installingFrame + 1) % ui_parameters.installing_frames;
	redraw = 1;
	}

	// update the progress bar animation, if active
	// skip this if we have a text overlay (too expensive to update)
	if (self->progressBarType == INDETERMINATE && !self->show_text) {
	redraw = 1;
	}

	// move the progress bar forward on timed intervals, if configured
	int duration = self->progressScopeDuration;
	if (self->progressBarType == DETERMINATE && duration > 0) {
	double elapsed = now() - self->progressScopeTime;
	float progress = 1.0 * elapsed / duration;
	if (progress > 1.0) progress = 1.0;
	if (progress > progress) {
	progress = progress;
	redraw = 1;
	}
	}

	if (redraw) self->update_progress_locked();

	pthread_mutex_unlock(&self->updateMutex);
	double end = now();
	// minimum of 20ms delay between frames
	double delay = interval - (end-start);
	if (delay < 0.02) delay = 0.02;
	usleep((long)(delay * 1000000));
	}
	return NULL;
	}

	int ScreenRecoveryUI::input_callback(int fd, short revents, void* data)
	{
	struct input_event ev;
	int ret;

	ret = ev_get_input(fd, revents, &ev);
	if (ret)
	return -1;

	if (ev.type == EV_SYN) {
	return 0;
	} else if (ev.type == EV_REL) {
	if (ev.code == REL_Y) {
	// accumulate the up or down motion reported by
	// the trackball. When it exceeds a threshold
	// (positive or negative), fake an up/down
	// key event.
	self->rel_sum += ev.value;
	if (self->rel_sum > 3) {
	self->process_key(KEY_DOWN, 1); // press down key
	self->process_key(KEY_DOWN, 0); // and release it
	self->rel_sum = 0;
	} else if (self->rel_sum < -3) {
	self->process_key(KEY_UP, 1); // press up key
	self->process_key(KEY_UP, 0); // and release it
	self->rel_sum = 0;
	}
	}
	} else {
	self->rel_sum = 0;
	}

	if (ev.type == EV_KEY && ev.code <= KEY_MAX)
	self->process_key(ev.code, ev.value);

	return 0;
	}

	// Process a key-up or -down event. A key is "registered" when it is
	// pressed and then released, with no other keypresses or releases in
	// between. Registered keys are passed to CheckKey() to see if it
	// should trigger a visibility toggle, an immediate reboot, or be
	// queued to be processed next time the foreground thread wants a key
	// (eg, for the menu).
	//
	// We also keep track of which keys are currently down so that
	// CheckKey can call IsKeyPressed to see what other keys are held when
	// a key is registered.
	//
	// updown == 1 for key down events; 0 for key up events
	void ScreenRecoveryUI::process_key(int key_code, int updown) {
	bool register_key = false;

	pthread_mutex_lock(&key_queue_mutex);
	key_pressed[key_code] = updown;
	if (updown) {
	key_last_down = key_code;
	} else {
	if (key_last_down == key_code)
	register_key = true;
	key_last_down = -1;
	}
	pthread_mutex_unlock(&key_queue_mutex);

	if (register_key) {
	switch (CheckKey(key_code)) {
	case RecoveryUI::TOGGLE:
	pthread_mutex_lock(&updateMutex);
	show_text = !show_text;
	if (show_text) show_text_ever = true;
	update_screen_locked();
	pthread_mutex_unlock(&updateMutex);
	break;

	case RecoveryUI::REBOOT:
	android_reboot(ANDROID_RB_RESTART, 0, 0);
	break;

	case RecoveryUI::ENQUEUE:
	pthread_mutex_lock(&key_queue_mutex);
	const int queue_max = sizeof(key_queue) / sizeof(key_queue[0]);
	if (key_queue_len < queue_max) {
	key_queue[key_queue_len++] = key_code;
	pthread_cond_signal(&key_queue_cond);
	}
	pthread_mutex_unlock(&key_queue_mutex);
	break;
	}
	}
	}

	// Reads input events, handles special hot keys, and adds to the key queue.
	void* ScreenRecoveryUI::input_thread(void *cookie)
	{
	for (;;) {
	if (!ev_wait(-1))
	ev_dispatch();
	}
	return NULL;
	}

	void ScreenRecoveryUI::LoadBitmap(const char* filename, gr_surface* surface) {
	int result = res_create_surface(filename, surface);
	if (result < 0) {
	LOGE("missing bitmap %s\n(Code %d)\n", filename, result);
	}
	}

	void ScreenRecoveryUI::Init()
	{
	gr_init();
	ev_init(input_callback, NULL);

	text_col = text_row = 0;
	text_rows = gr_fb_height() / CHAR_HEIGHT;
	if (text_rows > kMaxRows) text_rows = kMaxRows;
	text_top = 1;

	text_cols = gr_fb_width() / CHAR_WIDTH;
	if (text_cols > kMaxCols - 1) text_cols = kMaxCols - 1;

	LoadBitmap("icon_installing", &backgroundIcon[INSTALLING]);
	LoadBitmap("icon_error", &backgroundIcon[ERROR]);
	LoadBitmap("progress_empty", &progressBarEmpty);
	LoadBitmap("progress_fill", &progressBarFill);

	int i;

	progressBarIndeterminate = (gr_surface)malloc(ui_parameters.indeterminate_frames
	sizeof(gr_surface));
	for (i = 0; i < ui_parameters.indeterminate_frames; ++i) {
	char filename[40];
	// "indeterminate01.png", "indeterminate02.png", ...
	sprintf(filename, "indeterminate%02d", i+1);
	LoadBitmap(filename, progressBarIndeterminate+i);
	}

	if (ui_parameters.installing_frames > 0) {
	installationOverlay = (gr_surface)malloc(ui_parameters.installing_frames
	sizeof(gr_surface));
	for (i = 0; i < ui_parameters.installing_frames; ++i) {
	char filename[40];
	// "icon_installing_overlay01.png",
	// "icon_installing_overlay02.png", ...
	sprintf(filename, "icon_installing_overlay%02d", i+1);
	LoadBitmap(filename, installationOverlay+i);
	}

	// Adjust the offset to account for the positioning of the
	// base image on the screen.
	if (backgroundIcon[INSTALLING] != NULL) {
	gr_surface bg = backgroundIcon[INSTALLING];
	ui_parameters.install_overlay_offset_x +=
	(gr_fb_width() - gr_get_width(bg)) / 2;
	ui_parameters.install_overlay_offset_y +=
	(gr_fb_height() - gr_get_height(bg)) / 2;
	}
	} else {
	installationOverlay = NULL;
	}

	pthread_create(&progress_t, NULL, progress_thread, NULL);
	pthread_create(&input_t, NULL, input_thread, NULL);
	}

	void ScreenRecoveryUI::SetBackground(Icon icon)
	{
	pthread_mutex_lock(&updateMutex);
	currentIcon = icon;
	update_screen_locked();
	pthread_mutex_unlock(&updateMutex);
	}

	void ScreenRecoveryUI::SetProgressType(ProgressType type)
	{
	pthread_mutex_lock(&updateMutex);
	if (progressBarType != type) {
	progressBarType = type;
	update_progress_locked();
	}
	pthread_mutex_unlock(&updateMutex);
	}

	void ScreenRecoveryUI::ShowProgress(float portion, float seconds)
	{
	pthread_mutex_lock(&updateMutex);
	progressBarType = DETERMINATE;
	progressScopeStart += progressScopeSize;
	progressScopeSize = portion;
	progressScopeTime = now();
	progressScopeDuration = seconds;
	progress = 0;
	update_progress_locked();
	pthread_mutex_unlock(&updateMutex);
	}

	void ScreenRecoveryUI::SetProgress(float fraction)
	{
	pthread_mutex_lock(&updateMutex);
	if (fraction < 0.0) fraction = 0.0;
	if (fraction > 1.0) fraction = 1.0;
	if (progressBarType == DETERMINATE && fraction > progress) {
	// Skip updates that aren't visibly different.
	int width = gr_get_width(progressBarIndeterminate[0]);
	float scale = width * progressScopeSize;
	if ((int) (progress * scale) != (int) (fraction * scale)) {
	progress = fraction;
	update_progress_locked();
	}
	}
	pthread_mutex_unlock(&updateMutex);
	}

	void ScreenRecoveryUI::Print(const char *fmt, ...)
	{
	char buf[256];
	va_list ap;
	va_start(ap, fmt);
	vsnprintf(buf, 256, fmt, ap);
	va_end(ap);

	fputs(buf, stdout);

	// This can get called before ui_init(), so be careful.
	pthread_mutex_lock(&updateMutex);
	if (text_rows > 0 && text_cols > 0) {
	char *ptr;
	for (ptr = buf; *ptr != '\0'; ++ptr) {
	if (*ptr == '\n' \|\| text_col >= text_cols) {
	text[text_row][text_col] = '\0';
	text_col = 0;
	text_row = (text_row + 1) % text_rows;
	if (text_row == text_top) text_top = (text_top + 1) % text_rows;
	}
	if (ptr != '\n') text[text_row][text_col++] = ptr;
	}
	text[text_row][text_col] = '\0';
	update_screen_locked();
	}
	pthread_mutex_unlock(&updateMutex);
	}

	void ScreenRecoveryUI::StartMenu(const char* const * headers, const char* const * items,
	int initial_selection) {
	int i;
	pthread_mutex_lock(&updateMutex);
	if (text_rows > 0 && text_cols > 0) {
	for (i = 0; i < text_rows; ++i) {
	if (headers[i] == NULL) break;
	strncpy(menu[i], headers[i], text_cols-1);
	menu[i][text_cols-1] = '\0';
	}
	menu_top = i;
	for (; i < text_rows; ++i) {
	if (items[i-menu_top] == NULL) break;
	strncpy(menu[i], items[i-menu_top], text_cols-1);
	menu[i][text_cols-1] = '\0';
	}
	menu_items = i - menu_top;
	show_menu = 1;
	menu_sel = initial_selection;
	update_screen_locked();
	}
	pthread_mutex_unlock(&updateMutex);
	}

	int ScreenRecoveryUI::SelectMenu(int sel) {
	int old_sel;
	pthread_mutex_lock(&updateMutex);
	if (show_menu > 0) {
	old_sel = menu_sel;
	menu_sel = sel;
	if (menu_sel < 0) menu_sel = 0;
	if (menu_sel >= menu_items) menu_sel = menu_items-1;
	sel = menu_sel;
	if (menu_sel != old_sel) update_screen_locked();
	}
	pthread_mutex_unlock(&updateMutex);
	return sel;
	}

	void ScreenRecoveryUI::EndMenu() {
	int i;
	pthread_mutex_lock(&updateMutex);
	if (show_menu > 0 && text_rows > 0 && text_cols > 0) {
	show_menu = 0;
	update_screen_locked();
	}
	pthread_mutex_unlock(&updateMutex);
	}

	bool ScreenRecoveryUI::IsTextVisible()
	{
	pthread_mutex_lock(&updateMutex);
	int visible = show_text;
	pthread_mutex_unlock(&updateMutex);
	return visible;
	}

	bool ScreenRecoveryUI::WasTextEverVisible()
	{
	pthread_mutex_lock(&updateMutex);
	int ever_visible = show_text_ever;
	pthread_mutex_unlock(&updateMutex);
	return ever_visible;
	}

	void ScreenRecoveryUI::ShowText(bool visible)
	{
	pthread_mutex_lock(&updateMutex);
	show_text = visible;
	if (show_text) show_text_ever = 1;
	update_screen_locked();
	pthread_mutex_unlock(&updateMutex);
	}

	// Return true if USB is connected.
	bool ScreenRecoveryUI::usb_connected() {
	int fd = open("/sys/class/android_usb/android0/state", O_RDONLY);
	if (fd < 0) {
	printf("failed to open /sys/class/android_usb/android0/state: %s\n",
	strerror(errno));
	return 0;
	}

	char buf;
	/* USB is connected if android_usb state is CONNECTED or CONFIGURED */
	int connected = (read(fd, &buf, 1) == 1) && (buf == 'C');
	if (close(fd) < 0) {
	printf("failed to close /sys/class/android_usb/android0/state: %s\n",
	strerror(errno));
	}
	return connected;
	}

	int ScreenRecoveryUI::WaitKey()
	{
	pthread_mutex_lock(&key_queue_mutex);

	// Time out after UI_WAIT_KEY_TIMEOUT_SEC, unless a USB cable is
	// plugged in.
	do {
	struct timeval now;
	struct timespec timeout;
	gettimeofday(&now, NULL);
	timeout.tv_sec = now.tv_sec;
	timeout.tv_nsec = now.tv_usec * 1000;
	timeout.tv_sec += UI_WAIT_KEY_TIMEOUT_SEC;

	int rc = 0;
	while (key_queue_len == 0 && rc != ETIMEDOUT) {
	rc = pthread_cond_timedwait(&key_queue_cond, &key_queue_mutex,
	&timeout);
	}
	} while (usb_connected() && key_queue_len == 0);

	int key = -1;
	if (key_queue_len > 0) {
	key = key_queue[0];
	memcpy(&key_queue[0], &key_queue[1], sizeof(int) * --key_queue_len);
	}
	pthread_mutex_unlock(&key_queue_mutex);
	return key;
	}

	bool ScreenRecoveryUI::IsKeyPressed(int key)
	{
	pthread_mutex_lock(&key_queue_mutex);
	int pressed = key_pressed[key];
	pthread_mutex_unlock(&key_queue_mutex);
	return pressed;
	}

	void ScreenRecoveryUI::FlushKeys() {
	pthread_mutex_lock(&key_queue_mutex);
	key_queue_len = 0;
	pthread_mutex_unlock(&key_queue_mutex);
	}

	RecoveryUI::KeyAction ScreenRecoveryUI::CheckKey(int key) {
	return RecoveryUI::ENQUEUE;
	}