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Fix cursor size

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This commit is contained in:
Magnus Norddahl 2016-12-10 01:09:20 +01:00 committed by Christoph Oelckers
parent c4ca70101d
commit 54759782b3
1 changed files with 30 additions and 6 deletions
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34
src/win32/i_system.cpp
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@ -1375,10 +1375,16 @@ static HCURSOR CreateAlphaCursor(FTexture *cursorpic)
HBITMAP color, mono;
void *bits;
// Find closest integer scale factor for the monitor DPI
HDC screenDC = GetDC(0);
int dpi = GetDeviceCaps(screenDC, LOGPIXELSX);
int scale = MAX((dpi + 96 / 2 - 1) / 96, 1);
ReleaseDC(0, screenDC);
memset(&bi, 0, sizeof(bi));
bi.bV5Size = sizeof(bi);
bi.bV5Width = 32;
bi.bV5Height = 32;
bi.bV5Width = 32 * scale;
bi.bV5Height = 32 * scale;
bi.bV5Planes = 1;
bi.bV5BitCount = 32;
bi.bV5Compression = BI_BITFIELDS;
@ -1403,7 +1409,7 @@ static HCURSOR CreateAlphaCursor(FTexture *cursorpic)
}
// Create an empty mask bitmap, since CreateIconIndirect requires this.
mono = CreateBitmap(32, 32, 1, 1, NULL);
mono = CreateBitmap(32 * scale, 32 * scale, 1, 1, NULL);
if (mono == NULL)
{
DeleteObject(color);
@ -1413,10 +1419,28 @@ static HCURSOR CreateAlphaCursor(FTexture *cursorpic)
// Copy cursor to the color bitmap. Note that GDI bitmaps are upside down compared
// to normal conventions, so we create the FBitmap pointing at the last row and use
// a negative pitch so that CopyTrueColorPixels will use GDI's orientation.
FBitmap bmp((BYTE *)bits + 31*32*4, -32*4, 32, 32);
if (scale == 1)
{
FBitmap bmp((BYTE *)bits + 31 * 32 * 4, -32 * 4, 32, 32);
cursorpic->CopyTrueColorPixels(&bmp, 0, 0);
}
else
{
std::vector<uint32_t> unscaled;
unscaled.resize(32 * 32);
FBitmap bmp((BYTE *)unscaled.data() + 31 * 32 * 4, -32 * 4, 32, 32);
cursorpic->CopyTrueColorPixels(&bmp, 0, 0);
uint32_t *scaled = (uint32_t*)bits;
for (int y = 0; y < 32 * scale; y++)
{
for (int x = 0; x < 32 * scale; x++)
{
scaled[x + y * 32 * scale] = unscaled[x / scale + y / scale * 32];
}
}
}
return CreateBitmapCursor(cursorpic->LeftOffset, cursorpic->TopOffset, mono, color);
return CreateBitmapCursor(cursorpic->LeftOffset * scale, cursorpic->TopOffset * scale, mono, color);
}
//==========================================================================