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Create cursors with correct size when DPI changes

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GetIconInfo does not return DPI aware results.
Adjust it to the DPI of the display that shows the cursor.
This commit is contained in:
Maarten Bent
2020-05-31 23:16:20 +02:00
parent e59a5d17da
commit 5166ddea2b
1 changed files with 20 additions and 9 deletions
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29
src/msw/cursor.cpp
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@@ -36,6 +36,8 @@
#include "wx/module.h"
#endif
#include "wx/display.h"
#include "wx/msw/private.h"
#include "wx/msw/missing.h" // IDC_HAND
@@ -263,12 +265,20 @@ wxPoint wxCursor::GetHotSpot() const
namespace
{
void ReverseBitmap(HBITMAP bitmap, int width, int height)
wxSize ScaleAndReverseBitmap(HBITMAP& bitmap, float scale)
{
BITMAP bmp;
if ( !::GetObject(bitmap, sizeof(bmp), &bmp) )
return wxSize();
wxSize cs(bmp.bmWidth * scale, bmp.bmHeight * scale);
MemoryHDC hdc;
SelectInHDC selBitmap(hdc, bitmap);
::StretchBlt(hdc, width - 1, 0, -width, height,
hdc, 0, 0, width, height, SRCCOPY);
if ( scale != 1 )
::SetStretchBltMode(hdc, HALFTONE);
::StretchBlt(hdc, cs.x - 1, 0, -cs.x, cs.y, hdc, 0, 0, bmp.bmWidth, bmp.bmHeight, SRCCOPY);
return cs;
}
HCURSOR CreateReverseCursor(HCURSOR cursor)
@@ -277,14 +287,15 @@ HCURSOR CreateReverseCursor(HCURSOR cursor)
if ( !info.GetFrom(cursor) )
return NULL;
BITMAP bmp;
if ( !::GetObject(info.hbmMask, sizeof(bmp), &bmp) )
return NULL;
const unsigned displayID = (unsigned)wxDisplay::GetFromPoint(wxGetMousePosition());
wxDisplay disp(displayID == 0u || displayID < wxDisplay::GetCount() ? displayID : 0u);
const float scale = (float)disp.GetPPI().y / wxGetDisplayPPI().y;
ReverseBitmap(info.hbmMask, bmp.bmWidth, bmp.bmHeight);
wxSize cursorSize = ScaleAndReverseBitmap(info.hbmMask, scale);
if ( info.hbmColor )
ReverseBitmap(info.hbmColor, bmp.bmWidth, bmp.bmHeight);
info.xHotspot = (DWORD)bmp.bmWidth - 1 - info.xHotspot;
ScaleAndReverseBitmap(info.hbmColor, scale);
info.xHotspot = (DWORD)(cursorSize.x - 1 - info.xHotspot * scale);
info.yHotspot = (DWORD)(info.yHotspot * scale);
return ::CreateIconIndirect(&info);
}