GIFAnimate.cpp

#include "GIFAnimate.h"

CGIFAnimate::CGIFAnimate()
    : m_pImage(NULL),
      m_pDimensionID(NULL),
      m_pItem(NULL),
      m_CurrentFrame(1)
{
    // Initialize GDI+.
    GdiplusStartupInput gdiplusStartupInput;
    GdiplusStartup(&m_gdiplusToken, &gdiplusStartupInput, NULL);
}

CGIFAnimate::~CGIFAnimate()
{
    if(m_pItem != NULL)
        free(m_pItem);

    if(m_pDimensionID != NULL)
        delete[] m_pDimensionID;

    if(m_pImage != NULL)
        delete m_pImage;

    GdiplusShutdown(m_gdiplusToken);
}

void CGIFAnimate::PreCreate(CREATESTRUCT &cs)
{
    // 添加自绘样式 CButton 是BS_OWNERDRAW
    cs.style |= SS_OWNERDRAW;
}

LRESULT CGIFAnimate::WndProc(UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch(uMsg)
    {
    case WM_TIMER: return OnTimer(uMsg, wParam, lParam);
    }
    return WndProcDefault(uMsg, wParam, lParam);
}

LRESULT CGIFAnimate::OnDrawItem(UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    UNREFERENCED_PARAMETER(uMsg);

    LPDRAWITEMSTRUCT pDrawItem = (LPDRAWITEMSTRUCT) lParam;

    assert(m_pImage);

    Graphics graphics(pDrawItem->hDC);
    CRect rcClient = GetClientRect();
    // 绘制当前帧
    graphics.DrawImage(m_pImage, rcClient.left,rcClient.top,rcClient.Width(),
                rcClient.Height());

    return TRUE;
}

LRESULT CGIFAnimate::OnTimer(UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    KillTimer((UINT_PTR)wParam);

    m_pImage->SelectActiveFrame(&FrameDimensionTime, m_CurrentFrame);

    SetTimer(1, getDelay(), NULL);
    // 下一帧
    ++m_CurrentFrame;

    assert(m_FrameCount);
    m_CurrentFrame %= m_FrameCount;

    Invalidate(FALSE);
    return FinalWindowProc(uMsg, wParam, lParam);
}

LRESULT CGIFAnimate::OnMessageReflect(UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    UNREFERENCED_PARAMETER(lParam);

    switch (uMsg)
    {
    case WM_DRAWITEM: return OnDrawItem(uMsg, wParam, lParam);
    }

    return 0L;
}

void CGIFAnimate::Load(LPCWSTR sFileName)
{
    m_pImage = new Image(sFileName);

    // 获取维度数
    UINT count = m_pImage->GetFrameDimensionsCount();
    // 分配GUID数组用于存储维度
    m_pDimensionID = new GUID[count];
    m_pImage->GetFrameDimensionsList(m_pDimensionID, count);

    // 获取该维度多少帧
    m_FrameCount = m_pImage->GetFrameCount(&m_pDimensionID[0]);
    // 获取指定属性的大小 (PropertyTagFrameDelay: 时间间隔)
    UINT size = m_pImage->GetPropertyItemSize(PropertyTagFrameDelay);
    // 分配空间, 获取内容
    m_pItem = (PropertyItem *)malloc(size);
    m_pImage->GetPropertyItem(PropertyTagFrameDelay, size, m_pItem);
}

void CGIFAnimate::Play()
{
    m_CurrentFrame = 0;
    m_pImage->SelectActiveFrame(&FrameDimensionTime, m_CurrentFrame);

    SetTimer(1, getDelay(), NULL);
    // 下一帧
    ++m_CurrentFrame;
    Invalidate(FALSE);
}

void CGIFAnimate::Stop() {}