src/video/windows/SDL_windowsmouse.c
author Sam Lantinga <slouken@libsdl.org>
Mon, 24 Feb 2014 22:37:58 -0800
changeset 8252 3e4846dc97b1
parent 8149 681eb46b8ac4
child 8254 f97b5166c158
permissions -rw-r--r--
Fixed relative mouse mode with multiple windows.
The window cursor clipping will be taken care of when SDL_UpdateWindowGrab() is called.
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../../SDL_internal.h"
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#if SDL_VIDEO_DRIVER_WINDOWS
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#include "SDL_assert.h"
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#include "SDL_windowsvideo.h"
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#include "../../events/SDL_mouse_c.h"
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HCURSOR SDL_cursor = NULL;
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static SDL_Cursor *
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WIN_CreateDefaultCursor()
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{
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    SDL_Cursor *cursor;
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    cursor = SDL_calloc(1, sizeof(*cursor));
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    if (cursor) {
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        cursor->driverdata = LoadCursor(NULL, IDC_ARROW);
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    } else {
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        SDL_OutOfMemory();
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    }
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    return cursor;
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}
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static SDL_Cursor *
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WIN_CreateCursor(SDL_Surface * surface, int hot_x, int hot_y)
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{
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    /* msdn says cursor mask has to be padded out to word alignment. Not sure
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        if that means machine word or WORD, but this handles either case. */
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    const size_t pad = (sizeof (size_t) * 8);  /* 32 or 64, or whatever. */
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    SDL_Cursor *cursor;
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    HICON hicon;
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    HDC hdc;
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    BITMAPV4HEADER bmh;
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    LPVOID pixels;
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    LPVOID maskbits;
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    size_t maskbitslen;
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    ICONINFO ii;
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    SDL_zero(bmh);
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    bmh.bV4Size = sizeof(bmh);
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    bmh.bV4Width = surface->w;
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    bmh.bV4Height = -surface->h; /* Invert the image */
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    bmh.bV4Planes = 1;
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    bmh.bV4BitCount = 32;
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    bmh.bV4V4Compression = BI_BITFIELDS;
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    bmh.bV4AlphaMask = 0xFF000000;
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    bmh.bV4RedMask   = 0x00FF0000;
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    bmh.bV4GreenMask = 0x0000FF00;
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    bmh.bV4BlueMask  = 0x000000FF;
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    maskbitslen = ((surface->w + (pad - (surface->w % pad))) / 8) * surface->h;
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    maskbits = SDL_stack_alloc(Uint8,maskbitslen);
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    if (maskbits == NULL) {
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        SDL_OutOfMemory();
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        return NULL;
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    }
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    /* AND the cursor against full bits: no change. We already have alpha. */
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    SDL_memset(maskbits, 0xFF, maskbitslen);
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    hdc = GetDC(NULL);
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    SDL_zero(ii);
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    ii.fIcon = FALSE;
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    ii.xHotspot = (DWORD)hot_x;
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    ii.yHotspot = (DWORD)hot_y;
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    ii.hbmColor = CreateDIBSection(hdc, (BITMAPINFO*)&bmh, DIB_RGB_COLORS, &pixels, NULL, 0);
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    ii.hbmMask = CreateBitmap(surface->w, surface->h, 1, 1, maskbits);
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    ReleaseDC(NULL, hdc);
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    SDL_stack_free(maskbits);
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    SDL_assert(surface->format->format == SDL_PIXELFORMAT_ARGB8888);
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    SDL_assert(surface->pitch == surface->w * 4);
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    SDL_memcpy(pixels, surface->pixels, surface->h * surface->pitch);
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    hicon = CreateIconIndirect(&ii);
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    DeleteObject(ii.hbmColor);
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    DeleteObject(ii.hbmMask);
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    if (!hicon) {
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        WIN_SetError("CreateIconIndirect()");
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        return NULL;
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    }
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    cursor = SDL_calloc(1, sizeof(*cursor));
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    if (cursor) {
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        cursor->driverdata = hicon;
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    } else {
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        DestroyIcon(hicon);
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        SDL_OutOfMemory();
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    }
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    return cursor;
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}
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static SDL_Cursor *
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WIN_CreateSystemCursor(SDL_SystemCursor id)
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{
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    SDL_Cursor *cursor;
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    LPCTSTR name;
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    switch(id)
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    {
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    default:
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        SDL_assert(0);
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        return NULL;
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    case SDL_SYSTEM_CURSOR_ARROW:     name = IDC_ARROW; break;
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    case SDL_SYSTEM_CURSOR_IBEAM:     name = IDC_IBEAM; break;
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    case SDL_SYSTEM_CURSOR_WAIT:      name = IDC_WAIT; break;
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    case SDL_SYSTEM_CURSOR_CROSSHAIR: name = IDC_CROSS; break;
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    case SDL_SYSTEM_CURSOR_WAITARROW: name = IDC_WAIT; break;
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    case SDL_SYSTEM_CURSOR_SIZENWSE:  name = IDC_SIZENWSE; break;
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    case SDL_SYSTEM_CURSOR_SIZENESW:  name = IDC_SIZENESW; break;
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    case SDL_SYSTEM_CURSOR_SIZEWE:    name = IDC_SIZEWE; break;
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    case SDL_SYSTEM_CURSOR_SIZENS:    name = IDC_SIZENS; break;
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    case SDL_SYSTEM_CURSOR_SIZEALL:   name = IDC_SIZEALL; break;
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    case SDL_SYSTEM_CURSOR_NO:        name = IDC_NO; break;
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    case SDL_SYSTEM_CURSOR_HAND:      name = IDC_HAND; break;
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    }
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    cursor = SDL_calloc(1, sizeof(*cursor));
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    if (cursor) {
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        HICON hicon;
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        hicon = LoadCursor(NULL, name);
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        cursor->driverdata = hicon;
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    } else {
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        SDL_OutOfMemory();
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    }
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    return cursor;
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}
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static void
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WIN_FreeCursor(SDL_Cursor * cursor)
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{
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    HICON hicon = (HICON)cursor->driverdata;
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    DestroyIcon(hicon);
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    SDL_free(cursor);
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}
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static int
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WIN_ShowCursor(SDL_Cursor * cursor)
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{
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    if (cursor) {
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        SDL_cursor = (HCURSOR)cursor->driverdata;
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    } else {
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        SDL_cursor = NULL;
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    }
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    if (SDL_GetMouseFocus() != NULL) {
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        SetCursor(SDL_cursor);
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    }
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    return 0;
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}
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static void
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WIN_WarpMouse(SDL_Window * window, int x, int y)
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{
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    HWND hwnd = ((SDL_WindowData *) window->driverdata)->hwnd;
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    POINT pt;
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    pt.x = x;
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    pt.y = y;
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    ClientToScreen(hwnd, &pt);
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    SetCursorPos(pt.x, pt.y);
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}
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static int
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WIN_SetRelativeMouseMode(SDL_bool enabled)
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{
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    RAWINPUTDEVICE rawMouse = { 0x01, 0x02, 0, NULL }; /* Mouse: UsagePage = 1, Usage = 2 */
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    if (!enabled) {
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        rawMouse.dwFlags |= RIDEV_REMOVE;
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    }
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    /* (Un)register raw input for mice */
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    if (RegisterRawInputDevices(&rawMouse, 1, sizeof(RAWINPUTDEVICE)) == FALSE) {
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        /* Only return an error when registering. If we unregister and fail, then
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        it's probably that we unregistered twice. That's OK. */
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        if (enabled) {
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            return SDL_Unsupported();
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        }
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    }
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    return 0;
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}
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void
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WIN_InitMouse(_THIS)
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{
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    SDL_Mouse *mouse = SDL_GetMouse();
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    mouse->CreateCursor = WIN_CreateCursor;
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    mouse->CreateSystemCursor = WIN_CreateSystemCursor;
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    mouse->ShowCursor = WIN_ShowCursor;
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    mouse->FreeCursor = WIN_FreeCursor;
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    mouse->WarpMouse = WIN_WarpMouse;
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    mouse->SetRelativeMouseMode = WIN_SetRelativeMouseMode;
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    SDL_SetDefaultCursor(WIN_CreateDefaultCursor());
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    SDL_SetDoubleClickTime(GetDoubleClickTime());
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}
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void
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WIN_QuitMouse(_THIS)
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{
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    SDL_Mouse *mouse = SDL_GetMouse();
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    if ( mouse->def_cursor ) {
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        SDL_free(mouse->def_cursor);
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        mouse->def_cursor = NULL;
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        mouse->cur_cursor = NULL;
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    }
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}
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#endif /* SDL_VIDEO_DRIVER_WINDOWS */
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/* vi: set ts=4 sw=4 expandtab: */