janwas
56bd5b59b4
- factor cursor and clipboard out of sysdep.h - remove empty sysdep.cpp - wcpu: remove profiler code (it's in wprofiler.cpp if we ever need it) - robustify clipboard code - wsysdep: move code to determine app window into wutil; it's now used by the clipboard code This was SVN commit r5364.
108 lines
3.1 KiB
C++
108 lines
3.1 KiB
C++
#include "precompiled.h"
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#include "../cursor.h"
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#include "win.h"
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#include "wutil.h"
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static void* ptr_from_HICON(HICON hIcon)
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{
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return (void*)(uintptr_t)hIcon;
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}
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static void* ptr_from_HCURSOR(HCURSOR hCursor)
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{
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return (void*)(uintptr_t)hCursor;
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}
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static HICON HICON_from_ptr(void* p)
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{
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return (HICON)(uintptr_t)p;
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}
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static HCURSOR HCURSOR_from_ptr(void* p)
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{
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return (HCURSOR)(uintptr_t)p;
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}
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// creates a cursor from the given image.
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// w, h specify image dimensions [pixels]. limit is implementation-
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// dependent; 32x32 is typical and safe.
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// bgra_img is the cursor image (BGRA format, bottom-up).
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// it is no longer needed and can be freed after this call returns.
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// hotspot (hx,hy) is the offset from its upper-left corner to the
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// position where mouse clicks are registered.
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// cursor is only valid when INFO::OK is returned; in that case, it must be
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// sys_cursor_free-ed when no longer needed.
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LibError sys_cursor_create(uint w, uint h, void* bgra_img, uint hx, uint hy, void** cursor)
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{
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// MSDN says selecting this HBITMAP into a DC is slower since we use
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// CreateBitmap; bpp/format must be checked against those of the DC.
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// this is the simplest way and we don't care about slight performance
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// differences because this is typically only called once.
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HBITMAP hbmColour = CreateBitmap(w, h, 1, 32, bgra_img);
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// CreateIconIndirect doesn't access this; we just need to pass
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// an empty bitmap.
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HBITMAP hbmMask = CreateBitmap(w, h, 1, 1, 0);
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// create the cursor (really an icon; they differ only in
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// fIcon and the hotspot definitions).
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ICONINFO ii;
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ii.fIcon = FALSE; // cursor
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ii.xHotspot = hx;
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ii.yHotspot = hy;
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ii.hbmMask = hbmMask;
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ii.hbmColor = hbmColour;
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HICON hIcon = CreateIconIndirect(&ii);
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// CreateIconIndirect makes copies, so we no longer need these.
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DeleteObject(hbmMask);
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DeleteObject(hbmColour);
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if(!hIcon) // not INVALID_HANDLE_VALUE
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WARN_RETURN(ERR::FAIL);
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*cursor = ptr_from_HICON(hIcon);
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return INFO::OK;
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}
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LibError sys_cursor_create_empty(void **cursor)
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{
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u8 bgra_img[] = {0, 0, 0, 0};
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return sys_cursor_create(1, 1, bgra_img, 0, 0, cursor);
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}
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// replaces the current system cursor with the one indicated. need only be
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// called once per cursor; pass 0 to restore the default.
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LibError sys_cursor_set(void* cursor)
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{
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// restore default cursor.
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if(!cursor)
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cursor = ptr_from_HCURSOR(LoadCursor(0, MAKEINTRESOURCE(IDC_ARROW)));
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(void)SetCursor(HCURSOR_from_ptr(cursor));
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// return value (previous cursor) is useless.
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return INFO::OK;
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}
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// destroys the indicated cursor and frees its resources. if it is
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// currently the system cursor, the default cursor is restored first.
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LibError sys_cursor_free(void* cursor)
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{
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// bail now to prevent potential confusion below; there's nothing to do.
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if(!cursor)
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return INFO::OK;
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// if the cursor being freed is active, restore the default arrow
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// (just for safety).
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if(ptr_from_HCURSOR(GetCursor()) == cursor)
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WARN_ERR(sys_cursor_set(0));
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BOOL ok = DestroyIcon(HICON_from_ptr(cursor));
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return LibError_from_win32(ok);
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}
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