ImageModel Class Reference

#include <history.h>

Collaboration diagram for ImageModel:

Public Member Functions
	ImageModel ()
virtual	~ImageModel ()
HDC	GetDC ()
BOOL	CanUndo () const
BOOL	CanRedo () const
void	PushImageForUndo ()
void	PushImageForUndo (HBITMAP hbm)
void	PushImageForUndo (const RECT &rcPartial)
void	Undo (BOOL bClearRedo=FALSE)
void	Redo (void)
void	ClearHistory (void)
void	Crop (int nWidth, int nHeight, int nOffsetX=0, int nOffsetY=0)
void	SaveImage (LPCWSTR lpFileName)
BOOL	IsImageSaved () const
void	StretchSkew (int nStretchPercentX, int nStretchPercentY, int nSkewDegX=0, int nSkewDegY=0)
int	GetWidth () const
int	GetHeight () const
HBITMAP	CopyBitmap ()
HBITMAP	LockBitmap ()
void	UnlockBitmap (HBITMAP hbmLocked)
void	InvertColors ()
void	FlipHorizontally ()
void	FlipVertically ()
void	RotateNTimes90Degrees (int iN)
void	Clamp (POINT &pt) const
void	NotifyImageChanged ()
BOOL	IsBlackAndWhite ()
void	PushBlackAndWhite ()

Protected Member Functions
void	SwapPart ()
void	PushDone ()

Protected Attributes
HDC	m_hDrawingDC
HBITMAP	m_hbmMaster
int	m_currInd
int	m_undoSteps
int	m_redoSteps
IMAGE_PART	m_historyItems [HISTORYSIZE]
HGDIOBJ	m_hbmOld

Detailed Description

Definition at line 22 of file history.h.

Constructor & Destructor Documentation

ImageModel()

ImageModel::ImageModel

(

)

Definition at line 35 of file history.cpp.

    : m_hDrawingDC(::CreateCompatibleDC(NULL))
    , m_currInd(0)
    , m_undoSteps(0)
    , m_redoSteps(0)
{
    m_hbmMaster = CreateColorDIB(1, 1, RGB(255, 255, 255));
    m_hbmOld = ::SelectObject(m_hDrawingDC, m_hbmMaster);
 
    g_imageSaved = TRUE;
}

~ImageModel()

ImageModel::~ImageModel ( )

virtual

Definition at line 47 of file history.cpp.

{
    ::SelectObject(m_hDrawingDC, m_hbmOld); // De-select
    ::DeleteDC(m_hDrawingDC);
    ::DeleteObject(m_hbmMaster);
    ClearHistory();
}

Member Function Documentation

CanRedo()

BOOL ImageModel::CanRedo ( ) const

inline

Definition at line 30 of file history.h.

{ return m_redoSteps > 0; }

Referenced by CMainWindow::CanRedo(), and Redo().

CanUndo()

BOOL ImageModel::CanUndo ( ) const

inline

Definition at line 29 of file history.h.

{ return m_undoSteps > 0; }

Referenced by CMainWindow::CanUndo(), and Undo().

Clamp()

void ImageModel::Clamp

(

POINT &

pt

)

const

Definition at line 315 of file history.cpp.

{
    pt.x = max(0, min(pt.x, GetWidth()));
    pt.y = max(0, min(pt.y, GetHeight()));
}

Referenced by SelectionBaseTool::OnButtonDown(), SelectionBaseTool::OnButtonUp(), TextTool::OnButtonUp(), SelectionBaseTool::OnMouseMove(), and TextTool::UpdatePoint().

ClearHistory()

void ImageModel::ClearHistory

(

void

)

Definition at line 114 of file history.cpp.

{
    for (int i = 0; i < HISTORYSIZE; ++i)
    {
        m_historyItems[i].clear();
    }
 
    m_undoSteps = 0;
    m_redoSteps = 0;
}

Referenced by Crop(), DoLoadImageFile(), InitializeImage(), CMainWindow::OnCommand(), CCanvasWindow::OnPaint(), PushImageForUndo(), SetBitmapAndInfo(), and ~ImageModel().

CopyBitmap()

HBITMAP ImageModel::CopyBitmap

(

)

Definition at line 321 of file history.cpp.

{
    HBITMAP hBitmap = LockBitmap();
    HBITMAP ret = CopyDIBImage(hBitmap);
    UnlockBitmap(hBitmap);
    return ret;
}

Referenced by PushImageForUndo().

Crop()

void ImageModel::Crop	(	int	nWidth,
		int	nHeight,
		int	nOffsetX = 0,
		int	nOffsetY = 0
	)

Definition at line 191 of file history.cpp.

{
    // We cannot create bitmaps of size zero
    if (nWidth <= 0)
        nWidth = 1;
    if (nHeight <= 0)
        nHeight = 1;
 
    // Create a white HBITMAP
    HBITMAP hbmNew = CreateColorDIB(nWidth, nHeight, RGB(255, 255, 255));
    if (!hbmNew)
    {
        ShowOutOfMemory();
        ClearHistory();
        return;
    }
 
    // Put the master image as a sub-image
    RECT rcPart = { -nOffsetX, -nOffsetY, GetWidth() - nOffsetX, GetHeight() - nOffsetY };
    HBITMAP hbmOld = imageModel.LockBitmap();
    putSubImage(hbmNew, rcPart, hbmOld);
    imageModel.UnlockBitmap(hbmOld);
 
    // Push it
    PushImageForUndo(hbmNew);
 
    NotifyImageChanged();
}

Referenced by CMainWindow::InsertSelectionFromHBITMAP(), CCanvasWindow::OnButtonUp(), and CMainWindow::OnCommand().

FlipHorizontally()

void ImageModel::FlipHorizontally

(

)

Definition at line 277 of file history.cpp.

{
    PushImageForUndo();
    StretchBlt(m_hDrawingDC, GetWidth() - 1, 0, -GetWidth(), GetHeight(), GetDC(), 0, 0,
               GetWidth(), GetHeight(), SRCCOPY);
    NotifyImageChanged();
}

Referenced by CMainWindow::OnCommand().

FlipVertically()

void ImageModel::FlipVertically

(

)

Definition at line 285 of file history.cpp.

{
    PushImageForUndo();
    StretchBlt(m_hDrawingDC, 0, GetHeight() - 1, GetWidth(), -GetHeight(), GetDC(), 0, 0,
               GetWidth(), GetHeight(), SRCCOPY);
    NotifyImageChanged();
}

Referenced by CMainWindow::OnCommand().

GetDC()

HDC ImageModel::GetDC

(

)

Definition at line 272 of file history.cpp.

{
    return m_hDrawingDC;
}

Referenced by ToolBase::beginEvent(), SelectionModel::DeleteSelection(), CCanvasWindow::DoDraw(), FlipHorizontally(), FlipVertically(), SelectionModel::Landing(), SelectionBaseTool::OnButtonDown(), SelectionBaseTool::OnButtonUp(), CMainWindow::OnCommand(), SelectionBaseTool::OnMouseMove(), CFullscreenWindow::OnPaint(), and CMiniatureWindow::OnPaint().

GetHeight()

int ImageModel::GetHeight

(

)

const

Definition at line 259 of file history.cpp.

{
    return GetDIBHeight(m_hbmMaster);
}

Referenced by Clamp(), Crop(), CCanvasWindow::DoDraw(), ToolsModel::DrawWithMouseTool(), ColorTool::fetchColor(), FlipHorizontally(), FlipVertically(), CCanvasWindow::GetImageRect(), CMainWindow::InsertSelectionFromHBITMAP(), InvertColors(), CCanvasWindow::OnButtonUp(), CMainWindow::OnCommand(), CAttributesDialog::OnDefault(), CAttributesDialog::OnInitDialog(), CCanvasWindow::OnMouseMove(), CFullscreenWindow::OnPaint(), CMiniatureWindow::OnPaint(), PushImageForUndo(), RotateNTimes90Degrees(), ToolsModel::selectAll(), RegistrySettings::Store(), StretchSkew(), and CCanvasWindow::updateScrollRange().

GetWidth()

int ImageModel::GetWidth

(

)

const

Definition at line 254 of file history.cpp.

{
    return GetDIBWidth(m_hbmMaster);
}

Referenced by Clamp(), Crop(), CCanvasWindow::DoDraw(), ToolsModel::DrawWithMouseTool(), ColorTool::fetchColor(), FlipHorizontally(), FlipVertically(), CCanvasWindow::GetImageRect(), CMainWindow::InsertSelectionFromHBITMAP(), InvertColors(), CCanvasWindow::OnButtonUp(), CMainWindow::OnCommand(), CAttributesDialog::OnDefault(), CAttributesDialog::OnInitDialog(), CCanvasWindow::OnMouseMove(), CFullscreenWindow::OnPaint(), CMiniatureWindow::OnPaint(), PushImageForUndo(), RotateNTimes90Degrees(), ToolsModel::selectAll(), RegistrySettings::Store(), StretchSkew(), and CCanvasWindow::updateScrollRange().

InvertColors()

void ImageModel::InvertColors

(

)

Definition at line 264 of file history.cpp.

{
    RECT rect = {0, 0, GetWidth(), GetHeight()};
    PushImageForUndo();
    InvertRect(m_hDrawingDC, &rect);
    NotifyImageChanged();
}

Referenced by CMainWindow::OnCommand().

IsBlackAndWhite()

BOOL ImageModel::IsBlackAndWhite

(

)

Definition at line 329 of file history.cpp.

{
    HBITMAP hBitmap = LockBitmap();
    BOOL bBlackAndWhite = IsBitmapBlackAndWhite(hBitmap);
    UnlockBitmap(hBitmap);
    return bBlackAndWhite;
}

Referenced by CMainWindow::OnCommand(), and CAttributesDialog::OnInitDialog().

IsImageSaved()

BOOL ImageModel::IsImageSaved

(

)

const

Definition at line 225 of file history.cpp.

{
    return g_imageSaved;
}

Referenced by CMainWindow::ConfirmSave(), and OpenMailer().

LockBitmap()

HBITMAP ImageModel::LockBitmap

(

)

Definition at line 346 of file history.cpp.

{
    // NOTE: An app cannot select a bitmap into more than one device context at a time.
    ::SelectObject(m_hDrawingDC, m_hbmOld); // De-select
    HBITMAP hbmLocked = m_hbmMaster;
    m_hbmMaster = NULL;
    return hbmLocked;
}

Referenced by CopyBitmap(), Crop(), SelectionModel::GetSelectionContents(), IsBlackAndWhite(), OpenMailer(), PushBlackAndWhite(), PushImageForUndo(), RegistrySettings::SetWallpaper(), and SwapPart().

NotifyImageChanged()

void ImageModel::NotifyImageChanged

(

)

Definition at line 23 of file history.cpp.

{
    if (canvasWindow.IsWindow())
    {
        canvasWindow.updateScrollRange();
        canvasWindow.Invalidate();
    }
 
    if (miniature.IsWindow())
        miniature.Invalidate();
}

Referenced by Crop(), FlipHorizontally(), FlipVertically(), SelectionModel::HideSelection(), CMainWindow::InsertSelectionFromHBITMAP(), InvertColors(), SelectionModel::Landing(), SelectionModel::NotifyContentChanged(), TwoPointDrawTool::OnButtonDown(), SmoothDrawTool::OnButtonDown(), SelectionBaseTool::OnButtonDown(), BezierTool::OnButtonDown(), ShapeTool::OnButtonDown(), TwoPointDrawTool::OnButtonUp(), SmoothDrawTool::OnButtonUp(), SelectionBaseTool::OnButtonUp(), BezierTool::OnButtonUp(), ShapeTool::OnButtonUp(), CMainWindow::OnCommand(), ToolBase::OnEndDraw(), TwoPointDrawTool::OnMouseMove(), SmoothDrawTool::OnMouseMove(), SelectionBaseTool::OnMouseMove(), BezierTool::OnMouseMove(), ShapeTool::OnMouseMove(), CCanvasWindow::OnPaletteModelColorChanged(), PushDone(), Redo(), RotateNTimes90Degrees(), ToolsModel::SetBackgroundTransparent(), ToolsModel::SetBrushWidth(), ToolsModel::SetLineWidth(), ToolsModel::SetPenWidth(), SelectionModel::StretchSelection(), StretchSkew(), SelectionModel::TakeOff(), Undo(), and TextTool::UpdatePoint().

PushBlackAndWhite()

void ImageModel::PushBlackAndWhite

(

)

Definition at line 337 of file history.cpp.

{
    HBITMAP hBitmap = LockBitmap();
    HBITMAP hNewBitmap = ConvertToBlackAndWhite(hBitmap);
    UnlockBitmap(hBitmap);
 
    PushImageForUndo(hNewBitmap);
}

Referenced by CMainWindow::OnCommand().

PushDone()

void ImageModel::PushDone ( )

protected

Definition at line 179 of file history.cpp.

{
    m_currInd = (m_currInd + 1) % HISTORYSIZE; // Go next
 
    if (m_undoSteps < HISTORYSIZE - 1)
        m_undoSteps++;
    m_redoSteps = 0;
 
    g_imageSaved = FALSE;
    NotifyImageChanged();
}

Referenced by PushImageForUndo().

PushImageForUndo() [1/3]

void ImageModel::PushImageForUndo

(

)

Definition at line 125 of file history.cpp.

{
    HBITMAP hbm = CopyBitmap();
    if (hbm == NULL)
    {
        ShowOutOfMemory();
        ClearHistory();
        return;
    }
 
    PushImageForUndo(hbm);
}

Referenced by Crop(), SelectionModel::DeleteSelection(), FlipHorizontally(), FlipVertically(), InvertColors(), SelectionModel::Landing(), SelectionBaseTool::OnButtonDown(), FillTool::OnButtonDown(), TwoPointDrawTool::OnButtonUp(), SmoothDrawTool::OnButtonUp(), TextTool::OnButtonUp(), CMainWindow::OnCommand(), TextTool::OnEndDraw(), BezierTool::OnEndDraw(), ShapeTool::OnEndDraw(), PushBlackAndWhite(), PushImageForUndo(), RotateNTimes90Degrees(), SetBitmapAndInfo(), and StretchSkew().

PushImageForUndo() [2/3]

void ImageModel::PushImageForUndo

(

const RECT &

rcPartial

)

Definition at line 158 of file history.cpp.

{
    ATLTRACE("%s: %d\n", __FUNCTION__, m_currInd);
 
    IMAGE_PART& part = m_historyItems[m_currInd];
    part.clear();
    part.m_bPartial = TRUE;
    part.m_rcPart = rcPartial;
 
    CRect rcImage = { 0, 0, GetWidth(), GetHeight() };
    CRect& rc = part.m_rcPart;
    if (!rc.IntersectRect(rc, rcImage))
        rc.SetRect(-1, -1, 0, 0);
 
    HBITMAP hbmMaster = LockBitmap();
    part.m_hbmImage = getSubImage(hbmMaster, rc);
    UnlockBitmap(hbmMaster);
 
    PushDone();
}

PushImageForUndo() [3/3]

void ImageModel::PushImageForUndo

(

HBITMAP

hbm

)

Definition at line 138 of file history.cpp.

{
    ATLTRACE("%s: %d\n", __FUNCTION__, m_currInd);
 
    if (hbm == NULL)
    {
        ShowOutOfMemory();
        ClearHistory();
        return;
    }
 
    IMAGE_PART& part = m_historyItems[m_currInd];
    part.clear();
    part.m_hbmImage = m_hbmMaster;
    m_hbmMaster = hbm;
    ::SelectObject(m_hDrawingDC, m_hbmMaster); // Re-select
 
    PushDone();
}

Redo()

void ImageModel::Redo

(

void

)

Definition at line 94 of file history.cpp.

{
    ATLTRACE("%s: %d\n", __FUNCTION__, m_redoSteps);
    if (!CanRedo())
        return;
 
    selectionModel.HideSelection();
 
    ATLASSERT(m_hbmMaster != NULL);
    SwapPart();
    m_currInd = (m_currInd + 1) % HISTORYSIZE; // Go next
    ::SelectObject(m_hDrawingDC, m_hbmMaster); // Re-select
 
    m_redoSteps--;
    if (m_undoSteps < HISTORYSIZE - 1)
        m_undoSteps++;
 
    NotifyImageChanged();
}

Referenced by CMainWindow::OnCommand().

RotateNTimes90Degrees()

void ImageModel::RotateNTimes90Degrees

(

int

iN

)

Definition at line 293 of file history.cpp.

{
    switch (iN)
    {
        case 1:
        case 3:
        {
            HBITMAP hbm = Rotate90DegreeBlt(m_hDrawingDC, GetWidth(), GetHeight(), iN == 1, FALSE);
            PushImageForUndo(hbm);
            break;
        }
        case 2:
        {
            PushImageForUndo();
            ::StretchBlt(m_hDrawingDC, GetWidth() - 1, GetHeight() - 1, -GetWidth(), -GetHeight(),
                         m_hDrawingDC, 0, 0, GetWidth(), GetHeight(), SRCCOPY);
            break;
        }
    }
    NotifyImageChanged();
}

Referenced by CMainWindow::OnCommand().

SaveImage()

void ImageModel::SaveImage

(

LPCWSTR

lpFileName

)

Definition at line 220 of file history.cpp.

{
    SaveDIBToFile(m_hbmMaster, lpFileName, TRUE);
}

Referenced by CMainWindow::saveImage().

StretchSkew()

void ImageModel::StretchSkew	(	int	nStretchPercentX,
		int	nStretchPercentY,
		int	nSkewDegX = 0,
		int	nSkewDegY = 0
	)

Definition at line 230 of file history.cpp.

{
    int oldWidth = GetWidth();
    int oldHeight = GetHeight();
    INT newWidth = oldWidth * nStretchPercentX / 100;
    INT newHeight = oldHeight * nStretchPercentY / 100;
    if (oldWidth != newWidth || oldHeight != newHeight)
    {
        HBITMAP hbm0 = CopyDIBImage(m_hbmMaster, newWidth, newHeight);
        PushImageForUndo(hbm0);
    }
    if (nSkewDegX)
    {
        HBITMAP hbm1 = SkewDIB(m_hDrawingDC, m_hbmMaster, nSkewDegX, FALSE);
        PushImageForUndo(hbm1);
    }
    if (nSkewDegY)
    {
        HBITMAP hbm2 = SkewDIB(m_hDrawingDC, m_hbmMaster, nSkewDegY, TRUE);
        PushImageForUndo(hbm2);
    }
    NotifyImageChanged();
}

Referenced by CMainWindow::OnCommand().

SwapPart()

void ImageModel::SwapPart ( )

protected

Definition at line 55 of file history.cpp.

{
    IMAGE_PART& part = m_historyItems[m_currInd];
    if (!part.m_bPartial)
    {
        Swap(m_hbmMaster, part.m_hbmImage);
        return;
    }
 
    HBITMAP hbmMaster = LockBitmap();
    HBITMAP hbmPart = getSubImage(hbmMaster, part.m_rcPart);
    putSubImage(hbmMaster, part.m_rcPart, part.m_hbmImage);
    ::DeleteObject(part.m_hbmImage);
    part.m_hbmImage = hbmPart;
    UnlockBitmap(hbmMaster);
}

Referenced by Redo(), and Undo().

Undo()

void ImageModel::Undo

(

BOOL

bClearRedo = FALSE

)

Definition at line 72 of file history.cpp.

{
    ATLTRACE("%s: %d\n", __FUNCTION__, m_undoSteps);
    if (!CanUndo())
        return;
 
    selectionModel.HideSelection();
 
    m_currInd = (m_currInd + HISTORYSIZE - 1) % HISTORYSIZE; // Go previous
    ATLASSERT(m_hbmMaster != NULL);
    SwapPart();
    ::SelectObject(m_hDrawingDC, m_hbmMaster); // Re-select
 
    m_undoSteps--;
    if (bClearRedo)
        m_redoSteps = 0;
    else if (m_redoSteps < HISTORYSIZE - 1)
        m_redoSteps++;
 
    NotifyImageChanged();
}

Referenced by CMainWindow::OnCommand().

UnlockBitmap()

void ImageModel::UnlockBitmap

(

HBITMAP

hbmLocked

)

Definition at line 355 of file history.cpp.

{
    m_hbmMaster = hbmLocked;
    m_hbmOld = ::SelectObject(m_hDrawingDC, m_hbmMaster); // Re-select
}

Referenced by CopyBitmap(), Crop(), SelectionModel::GetSelectionContents(), IsBlackAndWhite(), OpenMailer(), PushBlackAndWhite(), PushImageForUndo(), RegistrySettings::SetWallpaper(), and SwapPart().

Member Data Documentation

m_currInd

int ImageModel::m_currInd

protected

Definition at line 58 of file history.h.

Referenced by PushDone(), PushImageForUndo(), Redo(), SwapPart(), and Undo().

m_hbmMaster

HBITMAP ImageModel::m_hbmMaster

protected

Definition at line 57 of file history.h.

Referenced by GetHeight(), GetWidth(), ImageModel(), LockBitmap(), PushImageForUndo(), Redo(), SaveImage(), StretchSkew(), SwapPart(), Undo(), UnlockBitmap(), and ~ImageModel().

m_hbmOld

HGDIOBJ ImageModel::m_hbmOld

protected

Definition at line 62 of file history.h.

Referenced by ImageModel(), LockBitmap(), UnlockBitmap(), and ~ImageModel().

m_hDrawingDC

HDC ImageModel::m_hDrawingDC

protected

Definition at line 56 of file history.h.

Referenced by FlipHorizontally(), FlipVertically(), GetDC(), ImageModel(), InvertColors(), LockBitmap(), PushImageForUndo(), Redo(), RotateNTimes90Degrees(), StretchSkew(), Undo(), UnlockBitmap(), and ~ImageModel().

m_historyItems

IMAGE_PART ImageModel::m_historyItems[HISTORYSIZE]

protected

Definition at line 61 of file history.h.

Referenced by ClearHistory(), PushImageForUndo(), and SwapPart().

m_redoSteps

int ImageModel::m_redoSteps

protected

Definition at line 60 of file history.h.

Referenced by CanRedo(), ClearHistory(), PushDone(), Redo(), and Undo().

m_undoSteps

int ImageModel::m_undoSteps

protected

Definition at line 59 of file history.h.

Referenced by CanUndo(), ClearHistory(), PushDone(), Redo(), and Undo().

---

The documentation for this class was generated from the following files:

• base/applications/mspaint/history.h
• base/applications/mspaint/history.cpp