Peter M. Groen / dali-demo

image-scaling-and-filtering-example.cpp 27.6 KB
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/*
 * Copyright (c) 2021 Samsung Electronics Co., Ltd.
 *
 * 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 <dali-toolkit/dali-toolkit.h>
#include <dali-toolkit/devel-api/controls/popup/popup.h>
#include <dali-toolkit/devel-api/controls/table-view/table-view.h>
#include <dali/dali.h>
#include <dali/devel-api/actors/actor-devel.h>
#include <iostream>
#include "shared/view.h"

using namespace Dali;
using Toolkit::TextLabel;

namespace
{
const char*   BACKGROUND_IMAGE(DEMO_IMAGE_DIR "background-gradient.jpg");
const Vector4 BACKGROUND_COLOUR(1.0f, 1.0f, 1.0f, 0.15f);

const char* BORDER_IMAGE(DEMO_IMAGE_DIR "border-4px.9.png");
const int   BORDER_WIDTH = (11.0f + 4.0f); // Shadow size = 11, border size = 4.
const char* RESIZE_HANDLE_IMAGE(DEMO_IMAGE_DIR "resize-handle.png");

const int MARGIN_SIZE = 10;

const char* const NEXT_BUTTON_ID     = "NEXT_BUTTON";
const char* const PREVIOUS_BUTTON_ID = "PREVIOUS_BUTTON";
const char* const DALI_ICON_PLAY     = DEMO_IMAGE_DIR "icon-play.png";

const char* const FITTING_BUTTON_ID    = "FITTING_BUTTON";
const char* const SAMPLING_BUTTON_ID   = "SAMPLING_BUTTON";
const char* const FITTING_BUTTON_TEXT  = "Fitting";
const char* const SAMPLING_BUTTON_TEXT = "Sampling";

const char* const STYLE_LABEL_TEXT  = "ImageScalingGroupLabel";
const char* const STYLE_BUTTON_TEXT = "ImageScalingButton";

const char* IMAGE_PATHS[] =
  {
    // Variety of sizes, shapes and formats:
    DEMO_IMAGE_DIR "dali-logo.png",
    DEMO_IMAGE_DIR "layer1.png",
    DEMO_IMAGE_DIR "layer2.png",
    DEMO_IMAGE_DIR "animation-list.png",
    DEMO_IMAGE_DIR "music-libray-main-screen.png",
    DEMO_IMAGE_DIR "music-libray-record-cover.png",
    DEMO_IMAGE_DIR "contacts-background.png",
    DEMO_IMAGE_DIR "portrait_screen_primitive_shapes.gif",
    DEMO_IMAGE_DIR "landscape_screen_primitive_shapes.gif",
    DEMO_IMAGE_DIR "square_primitive_shapes.bmp",
    DEMO_IMAGE_DIR "gallery-large-14.jpg",
    DEMO_IMAGE_DIR "book-landscape-cover.jpg",
    DEMO_IMAGE_DIR "book-portrait-p1.jpg",
    DEMO_IMAGE_DIR "book-landscape-cover-back.jpg",

    // Worst case for aliasing in downscaling, 2k x 2k 1 bit per pixel dithered
    // black and white image:
    DEMO_IMAGE_DIR "gallery-large-14.wbmp",

    DEMO_IMAGE_DIR "background-1.jpg",
    DEMO_IMAGE_DIR "background-blocks.jpg",
    DEMO_IMAGE_DIR "background-magnifier.jpg",
    DEMO_IMAGE_DIR "gallery-large-14.jpg",
    NULL};
const int NUM_IMAGE_PATHS = sizeof(IMAGE_PATHS) / sizeof(IMAGE_PATHS[0]) - 1u;

/** Cycle the scaling mode options. */
FittingMode::Type NextScalingMode(FittingMode::Type oldMode)
{
  FittingMode::Type newMode = FittingMode::SHRINK_TO_FIT;
  switch(oldMode)
  {
    case FittingMode::SHRINK_TO_FIT:
      newMode = FittingMode::SCALE_TO_FILL;
      break;
    case FittingMode::SCALE_TO_FILL:
      newMode = FittingMode::FIT_WIDTH;
      break;
    case FittingMode::FIT_WIDTH:
      newMode = FittingMode::FIT_HEIGHT;
      break;
    case FittingMode::FIT_HEIGHT:
      newMode = FittingMode::VISUAL_FITTING;
      break;
    case FittingMode::VISUAL_FITTING:
      newMode = FittingMode::SHRINK_TO_FIT;
      break;
  }
  return newMode;
}

/** Cycle through filter mode options. */
SamplingMode::Type NextFilterMode(SamplingMode::Type oldMode)
{
  SamplingMode::Type newMode = SamplingMode::BOX;

  switch(oldMode)
  {
    case SamplingMode::BOX:
      newMode = SamplingMode::NEAREST;
      break;
    case SamplingMode::NEAREST:
      newMode = SamplingMode::LINEAR;
      break;
    case SamplingMode::LINEAR:
      newMode = SamplingMode::BOX_THEN_NEAREST;
      break;
    case SamplingMode::BOX_THEN_NEAREST:
      newMode = SamplingMode::BOX_THEN_LINEAR;
      break;
    case SamplingMode::BOX_THEN_LINEAR:
      newMode = SamplingMode::NO_FILTER;
      break;
    case SamplingMode::NO_FILTER:
      newMode = SamplingMode::BOX;
      break;
    case SamplingMode::DONT_CARE:
      newMode = SamplingMode::BOX;
      break;
  }
  return newMode;
}

const char* StringFromScalingMode(FittingMode::Type scalingMode)
{
  return scalingMode == FittingMode::SCALE_TO_FILL ? "SCALE_TO_FILL" : scalingMode == FittingMode::SHRINK_TO_FIT ? "SHRINK_TO_FIT"
                                                                     : scalingMode == FittingMode::FIT_WIDTH     ? "FIT_WIDTH"
                                                                     : scalingMode == FittingMode::FIT_HEIGHT    ? "FIT_HEIGHT"
                                                                                                                 : "UnknownScalingMode";
}

const char* StringFromFilterMode(SamplingMode::Type filterMode)
{
  return filterMode == SamplingMode::BOX ? "BOX" : filterMode == SamplingMode::BOX_THEN_NEAREST ? "BOX_THEN_NEAREST"
                                                 : filterMode == SamplingMode::BOX_THEN_LINEAR  ? "BOX_THEN_LINEAR"
                                                 : filterMode == SamplingMode::NEAREST          ? "NEAREST"
                                                 : filterMode == SamplingMode::LINEAR           ? "LINEAR"
                                                 : filterMode == SamplingMode::NO_FILTER        ? "NO_FILTER"
                                                 : filterMode == SamplingMode::DONT_CARE        ? "DONT_CARE"
                                                                                                : "UnknownFilterMode";
}

} // namespace

// This example shows the load-time image scaling and filtering features.
//
class ImageScalingAndFilteringController : public ConnectionTracker
{
public:
  ImageScalingAndFilteringController(Application& application)
  : mApplication(application),
    mLastPinchScale(1.0f),
    mImageWindowScale(0.5f, 0.5f),
    mCurrentPath(0),
    mFittingMode(FittingMode::FIT_WIDTH),
    mSamplingMode(SamplingMode::BOX_THEN_LINEAR),
    mImageLoading(false),
    mQueuedImageLoad(false)
  {
    // Connect to the Application's Init signal
    mApplication.InitSignal().Connect(this, &ImageScalingAndFilteringController::Create);
  }

  ~ImageScalingAndFilteringController()
  {
    // Nothing to do here;
  }

  // The Init signal is received once (only) during the Application lifetime
  void Create(Application& application)
  {
    // Get a handle to the window
    Window  window     = application.GetWindow();
    Vector2 windowSize = window.GetSize();

    // Background image:
    Dali::Property::Map backgroundImage;
    backgroundImage.Insert(Toolkit::Visual::Property::TYPE, Toolkit::Visual::IMAGE);
    backgroundImage.Insert(Toolkit::ImageVisual::Property::URL, BACKGROUND_IMAGE);
    backgroundImage.Insert(Toolkit::ImageVisual::Property::DESIRED_WIDTH, windowSize.width);
    backgroundImage.Insert(Toolkit::ImageVisual::Property::DESIRED_HEIGHT, windowSize.height);
    backgroundImage.Insert(Toolkit::ImageVisual::Property::FITTING_MODE, FittingMode::SCALE_TO_FILL);
    backgroundImage.Insert(Toolkit::ImageVisual::Property::SAMPLING_MODE, SamplingMode::BOX_THEN_NEAREST);

    Toolkit::ImageView background = Toolkit::ImageView::New();
    background.SetProperty(Toolkit::ImageView::Property::IMAGE, backgroundImage);
    background.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_LEFT);
    background.SetProperty(Actor::Property::SIZE, windowSize);
    window.Add(background);

    mDesiredBox = Toolkit::ImageView::New(BORDER_IMAGE);
    background.Add(mDesiredBox);

    mDesiredBox.SetProperty(Actor::Property::SIZE, windowSize * mImageWindowScale);
    mDesiredBox.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER);
    mDesiredBox.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::CENTER);

    // Initialize the actor
    mImageView = Toolkit::ImageView::New(IMAGE_PATHS[0]);

    // Reposition the actor
    mImageView.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER);
    mImageView.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::CENTER);

    // Display the actor on the window
    mDesiredBox.Add(mImageView);

    mImageView.SetProperty(Actor::Property::SIZE, windowSize * mImageWindowScale);

    // Setup the pinch detector for scaling the desired image load dimensions:
    mPinchDetector = PinchGestureDetector::New();
    mPinchDetector.Attach(mImageView);
    mPinchDetector.DetectedSignal().Connect(this, &ImageScalingAndFilteringController::OnPinch);

    mGrabCorner = Toolkit::ImageView::New(RESIZE_HANDLE_IMAGE);
    mGrabCorner.SetResizePolicy(ResizePolicy::USE_NATURAL_SIZE, Dimension::ALL_DIMENSIONS);
    mGrabCorner.SetProperty(Dali::Actor::Property::NAME, "GrabCorner");
    mGrabCorner.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::BOTTOM_RIGHT);
    mGrabCorner.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::BOTTOM_RIGHT);
    mGrabCorner.SetProperty(Actor::Property::POSITION, Vector2(-BORDER_WIDTH, -BORDER_WIDTH));
    mGrabCorner.SetProperty(Actor::Property::OPACITY, 0.6f);

    Layer grabCornerLayer = Layer::New();
    grabCornerLayer.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::BOTTOM_RIGHT);
    grabCornerLayer.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::BOTTOM_RIGHT);
    grabCornerLayer.Add(mGrabCorner);
    mDesiredBox.Add(grabCornerLayer);

    mPanGestureDetector = PanGestureDetector::New();
    mPanGestureDetector.Attach(mGrabCorner);
    mPanGestureDetector.DetectedSignal().Connect(this, &ImageScalingAndFilteringController::OnPan);

    // Tie-in input event handlers:
    window.KeyEventSignal().Connect(this, &ImageScalingAndFilteringController::OnKeyEvent);

    CreateControls();

    ResizeImage();
  }

  /**
   * Create the GUI controls which float above the scene
   */
  void CreateControls()
  {
    Window  window     = mApplication.GetWindow();
    Vector2 windowSize = window.GetSize();

    Dali::Layer controlsLayer = Dali::Layer::New();
    controlsLayer.SetResizePolicy(ResizePolicy::SIZE_RELATIVE_TO_PARENT, Dimension::ALL_DIMENSIONS);
    controlsLayer.SetProperty(Actor::Property::SIZE_MODE_FACTOR, Vector3(1.0f, 1.0f, 1.0f));
    controlsLayer.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_LEFT);
    controlsLayer.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::TOP_LEFT);
    window.Add(controlsLayer);

    // Back and next image buttons in corners of window:
    unsigned int       playWidth     = std::min(windowSize.x * (1 / 5.0f), 58.0f);
    Toolkit::ImageView imagePrevious = Toolkit::ImageView::New(DALI_ICON_PLAY, ImageDimensions(playWidth, playWidth));

    // Last image button:
    imagePrevious.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_LEFT);
    imagePrevious.RotateBy(Radian(3.14159265358979323846f), Vector3(0, 1.0f, 0));
    imagePrevious.SetProperty(Actor::Property::POSITION_Y, playWidth * 0.5f);
    imagePrevious.SetProperty(Actor::Property::POSITION_X, playWidth + playWidth * 0.5f);
    imagePrevious.SetProperty(Actor::Property::OPACITY, 0.6f);
    controlsLayer.Add(imagePrevious);
    imagePrevious.SetProperty(Dali::Actor::Property::NAME, PREVIOUS_BUTTON_ID);
    imagePrevious.TouchedSignal().Connect(this, &ImageScalingAndFilteringController::OnControlTouched);

    // Next image button:
    Toolkit::ImageView imageNext = Toolkit::ImageView::New(DALI_ICON_PLAY, ImageDimensions(playWidth, playWidth));
    imageNext.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_RIGHT);
    imageNext.SetProperty(Actor::Property::POSITION_Y, playWidth * 0.5f);
    imageNext.SetProperty(Actor::Property::POSITION_X, windowSize.x - playWidth * 0.5f);
    imageNext.SetProperty(Actor::Property::OPACITY, 0.6f);
    controlsLayer.Add(imageNext);
    imageNext.SetProperty(Dali::Actor::Property::NAME, NEXT_BUTTON_ID);
    imageNext.TouchedSignal().Connect(this, &ImageScalingAndFilteringController::OnControlTouched);

    // Buttons to popup selectors for fitting and sampling modes:

    // Wrapper table to hold two buttons side by side:
    Toolkit::TableView modesGroupBackground = Toolkit::TableView::New(1, 2);
    modesGroupBackground.SetResizePolicy(ResizePolicy::FILL_TO_PARENT, Dimension::WIDTH);
    modesGroupBackground.SetResizePolicy(ResizePolicy::USE_NATURAL_SIZE, Dimension::HEIGHT);
    modesGroupBackground.SetBackgroundColor(BACKGROUND_COLOUR);
    modesGroupBackground.SetCellPadding(Size(MARGIN_SIZE * 0.5f, MARGIN_SIZE));
    modesGroupBackground.SetFitHeight(0);

    modesGroupBackground.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::BOTTOM_LEFT);
    modesGroupBackground.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::BOTTOM_LEFT);
    modesGroupBackground.SetProperty(Actor::Property::POSITION, Vector2(0.0f, 0.0f));

    controlsLayer.Add(modesGroupBackground);

    {
      // Vertical table to hold label and button:
      Toolkit::TableView fittingModeGroup = Toolkit::TableView::New(2, 1);
      fittingModeGroup.SetResizePolicy(ResizePolicy::FILL_TO_PARENT, Dimension::WIDTH);
      fittingModeGroup.SetResizePolicy(ResizePolicy::USE_NATURAL_SIZE, Dimension::HEIGHT);
      fittingModeGroup.SetBackgroundColor(BACKGROUND_COLOUR);
      fittingModeGroup.SetCellPadding(Size(MARGIN_SIZE * 0.5f, MARGIN_SIZE * 0.5f));
      fittingModeGroup.SetFitHeight(0);
      fittingModeGroup.SetFitHeight(1);

      TextLabel label = TextLabel::New("Image fitting mode:");
      label.SetStyleName(STYLE_LABEL_TEXT);
      fittingModeGroup.Add(label);

      Toolkit::PushButton button = CreateButton(FITTING_BUTTON_ID, StringFromScalingMode(mFittingMode));
      fittingModeGroup.Add(button);
      mFittingModeButton = button;

      modesGroupBackground.Add(fittingModeGroup);
    }

    {
      // Vertical table to hold label and button:
      Toolkit::TableView samplingModeGroup = Toolkit::TableView::New(2, 1);
      samplingModeGroup.SetResizePolicy(ResizePolicy::FILL_TO_PARENT, Dimension::WIDTH);
      samplingModeGroup.SetResizePolicy(ResizePolicy::USE_NATURAL_SIZE, Dimension::HEIGHT);
      samplingModeGroup.SetBackgroundColor(BACKGROUND_COLOUR);
      samplingModeGroup.SetCellPadding(Size(MARGIN_SIZE * 0.5f, MARGIN_SIZE * 0.5f));
      samplingModeGroup.SetFitHeight(0);
      samplingModeGroup.SetFitHeight(1);

      TextLabel label = TextLabel::New("Image sampling mode:");
      label.SetStyleName(STYLE_LABEL_TEXT);
      samplingModeGroup.Add(label);

      Toolkit::PushButton button = CreateButton(SAMPLING_BUTTON_ID, StringFromFilterMode(mSamplingMode));
      samplingModeGroup.Add(button);
      mSamplingModeButton = button;

      modesGroupBackground.Add(samplingModeGroup);
    }
  }

  Toolkit::PushButton CreateButton(const char* id, const char* label)
  {
    Toolkit::PushButton button = Toolkit::PushButton::New();
    button.SetStyleName(STYLE_BUTTON_TEXT);
    button.SetProperty(Dali::Actor::Property::NAME, id);
    button.SetProperty(Toolkit::Button::Property::LABEL, label);
    button.SetResizePolicy(ResizePolicy::FILL_TO_PARENT, Dimension::WIDTH);
    button.SetResizePolicy(ResizePolicy::USE_NATURAL_SIZE, Dimension::HEIGHT);
    button.ClickedSignal().Connect(this, &ImageScalingAndFilteringController::OnButtonClicked);
    return button;
  }

  Toolkit::Popup CreatePopup()
  {
    Window      window         = mApplication.GetWindow();
    const float POPUP_WIDTH_DP = window.GetSize().GetWidth() * 0.75f;

    Toolkit::Popup popup = Toolkit::Popup::New();
    popup.SetProperty(Dali::Actor::Property::NAME, "POPUP");
    popup.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER);
    popup.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::CENTER);
    popup.SetProperty(Actor::Property::SIZE, Vector2(POPUP_WIDTH_DP, 0.0f));

    popup.OutsideTouchedSignal().Connect(this, &ImageScalingAndFilteringController::OnPopupOutsideTouched);

    return popup;
  }

  Toolkit::PushButton CreatePopupButton(Actor parent, const char* id)
  {
    Toolkit::PushButton button = Toolkit::PushButton::New();
    button.SetProperty(Dali::Actor::Property::NAME, id);
    button.SetProperty(Toolkit::Button::Property::LABEL, id);

    button.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_LEFT);
    button.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::BOTTOM_LEFT);
    button.SetResizePolicy(ResizePolicy::FILL_TO_PARENT, Dimension::WIDTH);
    button.SetResizePolicy(ResizePolicy::USE_NATURAL_SIZE, Dimension::HEIGHT);

    button.ClickedSignal().Connect(this, &ImageScalingAndFilteringController::OnButtonClicked);

    parent.Add(button);
    return button;
  }

  bool OnButtonClicked(Toolkit::Button button)
  {
    if(button.GetProperty<std::string>(Dali::Actor::Property::NAME) == FITTING_BUTTON_ID)
    {
      mPopup = CreatePopup();

      // Four-row table to hold buttons:
      Toolkit::TableView fittingModes = Toolkit::TableView::New(4, 1);
      fittingModes.SetResizePolicy(ResizePolicy::FILL_TO_PARENT, Dimension::WIDTH);
      fittingModes.SetResizePolicy(ResizePolicy::USE_NATURAL_SIZE, Dimension::HEIGHT);
      fittingModes.SetCellPadding(Size(MARGIN_SIZE, MARGIN_SIZE * 0.5));
      fittingModes.SetFitHeight(0);
      fittingModes.SetFitHeight(1);
      fittingModes.SetFitHeight(2);
      fittingModes.SetFitHeight(3);

      CreatePopupButton(fittingModes, StringFromScalingMode(FittingMode::SCALE_TO_FILL));
      CreatePopupButton(fittingModes, StringFromScalingMode(FittingMode::SHRINK_TO_FIT));
      CreatePopupButton(fittingModes, StringFromScalingMode(FittingMode::FIT_WIDTH));
      CreatePopupButton(fittingModes, StringFromScalingMode(FittingMode::FIT_HEIGHT));

      mPopup.SetContent(fittingModes);
      mApplication.GetWindow().Add(mPopup);
      mPopup.SetDisplayState(Toolkit::Popup::SHOWN);
    }
    else if(button.GetProperty<std::string>(Dali::Actor::Property::NAME) == SAMPLING_BUTTON_ID)
    {
      mPopup = CreatePopup();

      // Table to hold buttons for each sampling mode:
      Toolkit::TableView samplingModes = Toolkit::TableView::New(6, 1);
      samplingModes.SetResizePolicy(ResizePolicy::FILL_TO_PARENT, Dimension::WIDTH);
      samplingModes.SetResizePolicy(ResizePolicy::USE_NATURAL_SIZE, Dimension::HEIGHT);
      samplingModes.SetCellPadding(Size(MARGIN_SIZE, MARGIN_SIZE * 0.5));
      samplingModes.SetFitHeight(0);
      samplingModes.SetFitHeight(1);
      samplingModes.SetFitHeight(2);
      samplingModes.SetFitHeight(3);
      samplingModes.SetFitHeight(4);
      samplingModes.SetFitHeight(5);

      CreatePopupButton(samplingModes, StringFromFilterMode(SamplingMode::NEAREST));
      CreatePopupButton(samplingModes, StringFromFilterMode(SamplingMode::LINEAR));
      CreatePopupButton(samplingModes, StringFromFilterMode(SamplingMode::BOX));
      CreatePopupButton(samplingModes, StringFromFilterMode(SamplingMode::BOX_THEN_NEAREST));
      CreatePopupButton(samplingModes, StringFromFilterMode(SamplingMode::BOX_THEN_LINEAR));
      CreatePopupButton(samplingModes, StringFromFilterMode(SamplingMode::NO_FILTER));

      mPopup.SetContent(samplingModes);
      mApplication.GetWindow().Add(mPopup);
      mPopup.SetDisplayState(Toolkit::Popup::SHOWN);
    }
    else if(CheckFittingModeButton(button, FittingMode::SCALE_TO_FILL) ||
            CheckFittingModeButton(button, FittingMode::SHRINK_TO_FIT) ||
            CheckFittingModeButton(button, FittingMode::FIT_WIDTH) ||
            CheckFittingModeButton(button, FittingMode::FIT_HEIGHT))
    {
    }
    else if(CheckSamplingModeButton(button, SamplingMode::NEAREST) ||
            CheckSamplingModeButton(button, SamplingMode::LINEAR) ||
            CheckSamplingModeButton(button, SamplingMode::BOX) ||
            CheckSamplingModeButton(button, SamplingMode::LINEAR) ||
            CheckSamplingModeButton(button, SamplingMode::BOX_THEN_NEAREST) ||
            CheckSamplingModeButton(button, SamplingMode::BOX_THEN_LINEAR) ||
            CheckSamplingModeButton(button, SamplingMode::NO_FILTER))
    {
    }
    return true;
  }

  bool CheckFittingModeButton(Actor& button, FittingMode::Type mode)
  {
    const char* const modeName = StringFromScalingMode(mode);
    if(button.GetProperty<std::string>(Dali::Actor::Property::NAME) == modeName)
    {
      mFittingMode = mode;
      mFittingModeButton.SetProperty(Toolkit::Button::Property::LABEL, modeName);
      ResizeImage();
      mPopup.SetDisplayState(Toolkit::Popup::HIDDEN);
      mPopup.Reset();
      return true;
    }
    return false;
  }

  bool CheckSamplingModeButton(Actor& button, SamplingMode::Type mode)
  {
    const char* const modeName = StringFromFilterMode(mode);
    if(button.GetProperty<std::string>(Dali::Actor::Property::NAME) == modeName)
    {
      mSamplingMode = mode;
      mSamplingModeButton.SetProperty(Toolkit::Button::Property::LABEL, modeName);
      ResizeImage();
      mPopup.SetDisplayState(Toolkit::Popup::HIDDEN);
      mPopup.Reset();
      return true;
    }
    return false;
  }

  void OnPopupOutsideTouched()
  {
    if(mPopup)
    {
      mPopup.SetDisplayState(Toolkit::Popup::HIDDEN);
      mPopup.Reset();
    }
  }

  bool OnControlTouched(Actor actor, const TouchEvent& event)
  {
    if(event.GetPointCount() > 0)
    {
      switch(event.GetState(0))
      {
        case PointState::UP:
        {
          const std::string& name = actor.GetProperty<std::string>(Dali::Actor::Property::NAME);
          if(name == NEXT_BUTTON_ID)
          {
            mCurrentPath = mCurrentPath + 1;
            mCurrentPath = mCurrentPath < NUM_IMAGE_PATHS ? mCurrentPath : 0;
            ResizeImage();
          }
          else if(name == PREVIOUS_BUTTON_ID)
          {
            mCurrentPath = mCurrentPath - 1;
            mCurrentPath = mCurrentPath >= 0 ? mCurrentPath : NUM_IMAGE_PATHS - 1;
            ResizeImage();
          }
          break;
        }
        default:
        {
          break;
        }
      } // end switch
    }

    return false;
  }

  void OnPinch(Actor actor, const PinchGesture& pinch)
  {
    if(pinch.GetState() == GestureState::STARTED)
    {
      mLastPinchScale = pinch.GetScale();
    }
    const float scale = pinch.GetScale();

    if(!Equals(scale, mLastPinchScale))
    {
      if(scale < mLastPinchScale)
      {
        mImageWindowScale.x = std::max(0.05f, mImageWindowScale.x * 0.9f);
        mImageWindowScale.y = std::max(0.05f, mImageWindowScale.y * 0.9f);
      }
      else
      {
        mImageWindowScale.x = std::max(0.05f, std::min(1.0f, mImageWindowScale.x * 1.1f));
        mImageWindowScale.y = std::max(0.05f, std::min(1.0f, mImageWindowScale.y * 1.1f));
      }
      ResizeImage();
    }
    mLastPinchScale = scale;
  }

  void OnPan(Actor actor, const PanGesture& gesture)
  {
    Window         window       = mApplication.GetWindow();
    Vector2        windowSize   = window.GetSize();
    const Vector2& displacement = gesture.GetDisplacement();

    // 1.0f and 0.75f are the maximum size caps of the resized image, as a factor of window-size.
    mImageWindowScale.x = std::max(0.05f, std::min(0.95f, mImageWindowScale.x + (displacement.x * 2.0f / windowSize.width)));
    mImageWindowScale.y = std::max(0.05f, std::min(0.70f, mImageWindowScale.y + (displacement.y * 2.0f / windowSize.height)));

    ResizeImage();
  }

  void OnKeyEvent(const KeyEvent& event)
  {
    if(event.GetState() == KeyEvent::DOWN)
    {
      if(IsKey(event, Dali::DALI_KEY_ESCAPE) || IsKey(event, Dali::DALI_KEY_BACK))
      {
        if(mPopup && mPopup.GetCurrentProperty<bool>(Actor::Property::VISIBLE))
        {
          mPopup.SetDisplayState(Toolkit::Popup::HIDDEN);
          mPopup.Reset();
        }
        else
        {
          mApplication.Quit();
        }
      }
      else if(event.GetKeyName() == "Right")
      {
        mImageWindowScale.x = std::max(0.05f, std::min(1.0f, mImageWindowScale.x * 1.1f));
      }
      else if(event.GetKeyName() == "Left")
      {
        mImageWindowScale.x = std::max(0.05f, mImageWindowScale.x * 0.9f);
      }
      else if(event.GetKeyName() == "Up")
      {
        mImageWindowScale.y = std::max(0.05f, std::min(1.0f, mImageWindowScale.y * 1.1f));
      }
      else if(event.GetKeyName() == "Down")
      {
        mImageWindowScale.y = std::max(0.05f, mImageWindowScale.y * 0.9f);
      }
      else if(event.GetKeyName() == "o")
      {
        mImageWindowScale.x = std::max(0.05f, mImageWindowScale.x * 0.9f);
        mImageWindowScale.y = std::max(0.05f, mImageWindowScale.y * 0.9f);
      }
      else if(event.GetKeyName() == "p")
      {
        mImageWindowScale.x = std::max(0.05f, std::min(1.0f, mImageWindowScale.x * 1.1f));
        mImageWindowScale.y = std::max(0.05f, std::min(1.0f, mImageWindowScale.y * 1.1f));
      }
      else if(event.GetKeyName() == "n")
      {
        mCurrentPath = mCurrentPath + 1;
        mCurrentPath = mCurrentPath < NUM_IMAGE_PATHS ? mCurrentPath : 0;
      }
      else if(event.GetKeyName() == "b")
      {
        mCurrentPath = mCurrentPath - 1;
        mCurrentPath = mCurrentPath >= 0 ? mCurrentPath : NUM_IMAGE_PATHS - 1;
      }
      // Cycle filter and scaling modes:
      else if(event.GetKeyName() == "f")
      {
        mSamplingMode = NextFilterMode(mSamplingMode);
        mSamplingModeButton.SetProperty(Toolkit::Button::Property::LABEL, StringFromFilterMode(mSamplingMode));
      }
      // Cycle filter and scaling modes:
      else if(event.GetKeyName() == "s")
      {
        mFittingMode = NextScalingMode(mFittingMode);
        mFittingModeButton.SetProperty(Toolkit::Button::Property::LABEL, StringFromScalingMode(mFittingMode));
      }
      else
      {
        return;
      }

      ResizeImage();
    }
  }

private:
  void LoadImage()
  {
    mImageLoading = true;

    const char* const path      = IMAGE_PATHS[mCurrentPath];
    Window            window    = mApplication.GetWindow();
    Size              imageSize = Vector2(window.GetSize()) * mImageWindowScale;
    mImageView.SetProperty(Actor::Property::SIZE, imageSize);

    Property::Map map;
    map[Toolkit::ImageVisual::Property::URL]            = path;
    map[Toolkit::ImageVisual::Property::DESIRED_WIDTH]  = imageSize.x;
    map[Toolkit::ImageVisual::Property::DESIRED_HEIGHT] = imageSize.y;
    map[Toolkit::ImageVisual::Property::FITTING_MODE]   = mFittingMode;
    map[Toolkit::ImageVisual::Property::SAMPLING_MODE]  = mSamplingMode;

    mImageView.SetProperty(Toolkit::ImageView::Property::IMAGE, map);
  }

  void ResizeImage()
  {
    Window  window     = mApplication.GetWindow();
    Vector2 windowSize = window.GetSize();
    Size    imageSize  = windowSize * mImageWindowScale;

    LoadImage();

    // Border size needs to be modified to take into account the width of the frame.
    Vector2 borderScale((imageSize + Vector2(BORDER_WIDTH * 2.0f, BORDER_WIDTH * 2.0f)) / windowSize);
    mDesiredBox.SetProperty(Actor::Property::SIZE, windowSize * borderScale);
  }

private:
  Application&         mApplication;
  Toolkit::ImageView   mDesiredBox; //< Background rectangle to show requested image size.
  Toolkit::PushButton  mFittingModeButton;
  Toolkit::PushButton  mSamplingModeButton;
  Toolkit::Popup       mPopup;
  PinchGestureDetector mPinchDetector;
  float                mLastPinchScale;
  Toolkit::ImageView   mGrabCorner;
  PanGestureDetector   mPanGestureDetector;
  Toolkit::ImageView   mImageView;
  Vector2              mImageWindowScale;
  int                  mCurrentPath;
  FittingMode::Type    mFittingMode;
  SamplingMode::Type   mSamplingMode;
  bool                 mImageLoading;
  bool                 mQueuedImageLoad;
};

int DALI_EXPORT_API main(int argc, char** argv)
{
  Application                        application = Application::New(&argc, &argv, DEMO_THEME_PATH);
  ImageScalingAndFilteringController test(application);
  application.MainLoop();
  return 0;
}