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[MSPAINT] Add CachedBufferDIB function and use it

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We do caching on buffering paint.
This will improve performance a little.
CORE-18867
This commit is contained in:
Katayama Hirofumi MZ 2023-06-16 08:05:23 +09:00
parent c706222f3f
commit 2f856f6f0d
8 changed files with 73 additions and 9 deletions
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17
base/applications/mspaint/palette.cpp
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@ -21,6 +21,17 @@ CPaletteWindow paletteWindow;
/* FUNCTIONS ********************************************************/
CPaletteWindow::CPaletteWindow()
: m_hbmCached(NULL)
{
}
CPaletteWindow::~CPaletteWindow()
{
if (m_hbmCached)
::DeleteObject(m_hbmCached);
}
static VOID drawColorBox(HDC hDC, LPCRECT prc, COLORREF rgbColor, UINT nBorder)
{
RECT rc = *prc;
@ -76,8 +87,8 @@ LRESULT CPaletteWindow::OnPaint(UINT nMsg, WPARAM wParam, LPARAM lParam, BOOL& b
/* To avoid flickering, we use a memory bitmap.
The left and top values are zeros in client rectangle */
HDC hMemDC = ::CreateCompatibleDC(hDC);
HBITMAP hbm = ::CreateCompatibleBitmap(hDC, rcClient.right, rcClient.bottom);
HGDIOBJ hbmOld = ::SelectObject(hMemDC, hbm);
m_hbmCached = CachedBufferDIB(m_hbmCached, rcClient.right, rcClient.bottom);
HGDIOBJ hbmOld = ::SelectObject(hMemDC, m_hbmCached);
/* Fill the background (since WM_ERASEBKGND handling is disabled) */
::FillRect(hMemDC, &rcClient, (HBRUSH)(COLOR_3DFACE + 1));
@ -121,7 +132,7 @@ LRESULT CPaletteWindow::OnPaint(UINT nMsg, WPARAM wParam, LPARAM lParam, BOOL& b
/* Transfer bits (hDC <-- hMemDC) */
::BitBlt(hDC, 0, 0, rcClient.right, rcClient.bottom, hMemDC, 0, 0, SRCCOPY);
::DeleteObject(::SelectObject(hMemDC, hbmOld));
::SelectObject(hMemDC, hbmOld);
::DeleteDC(hMemDC);
EndPaint(&ps);
return 0;