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Use DDBLT_COLORFILL to clear screen (#505)

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Anders Jenbo 2025-07-03 20:12:55 +02:00 committed by GitHub
parent 0191be7461
commit 3868071fb8
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1 changed files with 7 additions and 17 deletions
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24
LEGO1/mxdirectx/mxdirectdraw.cpp
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@ -519,35 +519,25 @@ BOOL MxDirectDraw::DDCreateSurfaces()
void MxDirectDraw::ClearBackBuffers() void MxDirectDraw::ClearBackBuffers()
{ {
HRESULT result; HRESULT result;
byte* line; DDBLTFX ddbltfx;
DDSURFACEDESC ddsd;
int count = m_bFlipSurfaces ? 2 : 1; int count = m_bFlipSurfaces ? 2 : 1;
int value = 0;
for (int i = 0; i < count; i++) { for (int i = 0; i < count; i++) {
memset(&ddsd, 0, sizeof(ddsd)); memset(&ddbltfx, 0, sizeof(ddbltfx));
ddsd.dwSize = sizeof(ddsd); ddbltfx.dwSize = sizeof(ddbltfx);
ddbltfx.dwFillColor = 0;
result = m_pBackBuffer->Lock(NULL, &ddsd, DDLOCK_WAIT | DDLOCK_WRITEONLY, NULL); result = m_pBackBuffer->Blt(NULL, NULL, NULL, DDBLT_COLORFILL | DDBLT_WAIT, &ddbltfx);
if (result == DDERR_SURFACELOST) { if (result == DDERR_SURFACELOST) {
m_pBackBuffer->Restore(); m_pBackBuffer->Restore();
result = m_pBackBuffer->Lock(NULL, &ddsd, DDLOCK_WAIT | DDLOCK_WRITEONLY, NULL); result = m_pBackBuffer->Blt(NULL, NULL, NULL, DDBLT_COLORFILL | DDBLT_WAIT, &ddbltfx);
} }
if (result != DD_OK) { if (result != DD_OK) {
// lock failed // blt failed
return; return;
} }
// clear backBuffer
line = (byte*) ddsd.lpSurface;
for (int j = ddsd.dwHeight; j--;) {
memset(line, value, ddsd.dwWidth);
line += ddsd.lPitch;
}
m_pBackBuffer->Unlock(ddsd.lpSurface);
if (m_bFlipSurfaces) { if (m_bFlipSurfaces) {
m_pFrontBuffer->Flip(NULL, DDFLIP_WAIT); m_pFrontBuffer->Flip(NULL, DDFLIP_WAIT);
} }