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[MSPAINT] Calculate intersection to reduce bits transfer (#5795)

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Drawing lines smoothly on big image.
- In CCanvasWindow::DoDraw, calculate the
  intersection to reduce bits transfer.
- Improve SmoothDrawTool in handling Shift key.
CORE-19094, CORE-19237
This commit is contained in:
Katayama Hirofumi MZ 2023-10-16 09:09:40 +09:00 • committed by GitHub
parent 5c2ec83fa7
commit fd1e158480
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 27 additions and 17 deletions
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26
base/applications/mspaint/canvas.cpp
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@ -91,29 +91,43 @@ HITTEST CCanvasWindow::CanvasHitTest(POINT pt)
VOID CCanvasWindow::DoDraw(HDC hDC, RECT& rcClient, RECT& rcPaint)
{
// This is the target area we have to draw on
CRect rcCanvasDraw;
rcCanvasDraw.IntersectRect(&rcClient, &rcPaint);
// We use a memory bitmap to reduce flickering
HDC hdcMem0 = ::CreateCompatibleDC(hDC);
m_ahbmCached[0] = CachedBufferDIB(m_ahbmCached[0], rcClient.right, rcClient.bottom);
HGDIOBJ hbm0Old = ::SelectObject(hdcMem0, m_ahbmCached[0]);
// Fill the background on hdcMem0
::FillRect(hdcMem0, &rcPaint, (HBRUSH)(COLOR_APPWORKSPACE + 1));
::FillRect(hdcMem0, &rcCanvasDraw, (HBRUSH)(COLOR_APPWORKSPACE + 1));
// Draw the sizeboxes if necessary
RECT rcBase = GetBaseRect();
if (!selectionModel.m_bShow && !::IsWindowVisible(textEditWindow))
drawSizeBoxes(hdcMem0, &rcBase, FALSE, &rcPaint);
drawSizeBoxes(hdcMem0, &rcBase, FALSE, &rcCanvasDraw);
// Calculate image size
CRect rcImage;
GetImageRect(rcImage);
SIZE sizeImage = { imageModel.GetWidth(), imageModel.GetHeight() };
// Calculate the target area on the image
CRect rcImageDraw = rcCanvasDraw;
CanvasToImage(rcImageDraw);
rcImageDraw.IntersectRect(&rcImageDraw, &rcImage);
// Consider rounding down by zooming
rcImageDraw.right += 1;
rcImageDraw.bottom += 1;
// hdcMem1 <-- imageModel
HDC hdcMem1 = ::CreateCompatibleDC(hDC);
m_ahbmCached[1] = CachedBufferDIB(m_ahbmCached[1], sizeImage.cx, sizeImage.cy);
HGDIOBJ hbm1Old = ::SelectObject(hdcMem1, m_ahbmCached[1]);
BitBlt(hdcMem1, 0, 0, sizeImage.cx, sizeImage.cy, imageModel.GetDC(), 0, 0, SRCCOPY);
::BitBlt(hdcMem1, rcImageDraw.left, rcImageDraw.top, rcImageDraw.Width(), rcImageDraw.Height(),
imageModel.GetDC(), rcImageDraw.left, rcImageDraw.top, SRCCOPY);
// Draw overlay #1 on hdcMem1
toolsModel.OnDrawOverlayOnImage(hdcMem1);
@ -158,10 +172,8 @@ VOID CCanvasWindow::DoDraw(HDC hDC, RECT& rcClient, RECT& rcPaint)
DrawXorRect(hdcMem0, &m_rcResizing);
// Transfer the bits (hDC <-- hdcMem0)
::BitBlt(hDC,
rcPaint.left, rcPaint.top,
rcPaint.right - rcPaint.left, rcPaint.bottom - rcPaint.top,
hdcMem0, rcPaint.left, rcPaint.top, SRCCOPY);
::BitBlt(hDC, rcCanvasDraw.left, rcCanvasDraw.top, rcCanvasDraw.Width(), rcCanvasDraw.Height(),
hdcMem0, rcCanvasDraw.left, rcCanvasDraw.top, SRCCOPY);
// Clean up hdcMem0
::SelectObject(hdcMem0, hbm0Old);