imagelist.c

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/*
 *  ImageList implementation
 *
 *  Copyright 1998 Eric Kohl
 *  Copyright 2000 Jason Mawdsley
 *  Copyright 2001, 2004 Michael Stefaniuc
 *  Copyright 2001 Charles Loep for CodeWeavers
 *  Copyright 2002 Dimitrie O. Paun
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * NOTE
 * 
 * This code was audited for completeness against the documented features
 * of Comctl32.dll version 6.0 on Sep. 12, 2002, by Dimitrie O. Paun.
 * 
 * Unless otherwise noted, we believe this code to be complete, as per
 * the specification mentioned above.
 * If you discover missing features, or bugs, please note them below.
 * 
 *  TODO:
 *    - Add support for ILD_PRESERVEALPHA, ILD_SCALE, ILD_DPISCALE
 *    - Add support for ILS_GLOW, ILS_SHADOW, ILS_SATURATE, ILS_ALPHA
 *    - Thread-safe locking
 */

#include <stdarg.h>
#include <stdlib.h>
#include <string.h>

#define COBJMACROS

#include "winerror.h"
#include "windef.h"
#include "winbase.h"
#include "objbase.h"
#include "wingdi.h"
#include "winuser.h"
#include "commctrl.h"
#include "comctl32.h"
#include "imagelist.h"
#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL(imagelist);


#define MAX_OVERLAYIMAGE 15

/* internal image list data used for Drag & Drop operations */
typedef struct
{
    HWND	hwnd;
    HIMAGELIST	himl;
    /* position of the drag image relative to the window */
    INT		x;
    INT		y;
    /* offset of the hotspot relative to the origin of the image */
    INT		dxHotspot;
    INT		dyHotspot;
    /* is the drag image visible */
    BOOL	bShow;
    /* saved background */
    HBITMAP	hbmBg;
} INTERNALDRAG;

static INTERNALDRAG InternalDrag = { 0, 0, 0, 0, 0, 0, FALSE, 0 };

static HBITMAP ImageList_CreateImage(HDC hdc, HIMAGELIST himl, UINT width, UINT height);

static inline BOOL is_valid(HIMAGELIST himl)
{
    return himl && himl->magic == IMAGELIST_MAGIC;
}


/*************************************************************************
 * IMAGELIST_InternalExpandBitmaps [Internal]
 *
 * Expands the bitmaps of an image list by the given number of images.
 *
 * PARAMS
 *     himl        [I] handle to image list
 *     nImageCount [I] number of images to add
 *
 * RETURNS
 *     nothing
 *
 * NOTES
 *     This function CANNOT be used to reduce the number of images.
 */
static void
IMAGELIST_InternalExpandBitmaps (HIMAGELIST himl, INT nImageCount, INT cx, INT cy)
{
    HDC     hdcBitmap;
    HBITMAP hbmNewBitmap, hbmNull;
    INT     nNewWidth, nNewCount;

    if ((himl->cCurImage + nImageCount <= himl->cMaxImage)
        && (himl->cy >= cy))
	return;

    if (cy == 0) cy = himl->cy;
    nNewCount = himl->cCurImage + nImageCount + himl->cGrow;
    nNewWidth = nNewCount * himl->cx;

    TRACE("Create expanded bitmaps : himl=%p x=%d y=%d count=%d\n", himl, nNewWidth, cy, nNewCount);
    hdcBitmap = CreateCompatibleDC (0);

    hbmNewBitmap = ImageList_CreateImage(hdcBitmap, himl, nNewWidth, cy);

    if (hbmNewBitmap == 0)
        ERR("creating new image bitmap (x=%d y=%d)!\n", nNewWidth, cy);

    if(himl->cCurImage)
    {
        hbmNull = SelectObject (hdcBitmap, hbmNewBitmap);
        BitBlt (hdcBitmap, 0, 0, himl->cCurImage * himl->cx, cy,
                himl->hdcImage, 0, 0, SRCCOPY);
        SelectObject (hdcBitmap, hbmNull);
    }
    SelectObject (himl->hdcImage, hbmNewBitmap);
    DeleteObject (himl->hbmImage);
    himl->hbmImage = hbmNewBitmap;

    if (himl->flags & ILC_MASK)
    {
        hbmNewBitmap = CreateBitmap (nNewWidth, cy, 1, 1, NULL);

        if (hbmNewBitmap == 0)
            ERR("creating new mask bitmap!\n");

	if(himl->cCurImage)
	{
	    hbmNull = SelectObject (hdcBitmap, hbmNewBitmap);
	    BitBlt (hdcBitmap, 0, 0, himl->cCurImage * himl->cx, cy,
		    himl->hdcMask, 0, 0, SRCCOPY);
	    SelectObject (hdcBitmap, hbmNull);
	}
        SelectObject (himl->hdcMask, hbmNewBitmap);
        DeleteObject (himl->hbmMask);
        himl->hbmMask = hbmNewBitmap;
    }

    himl->cMaxImage = nNewCount;

    DeleteDC (hdcBitmap);
}


/*************************************************************************
 * ImageList_Add [COMCTL32.@]
 *
 * Add an image or images to an image list.
 *
 * PARAMS
 *     himl     [I] handle to image list
 *     hbmImage [I] handle to image bitmap
 *     hbmMask  [I] handle to mask bitmap
 *
 * RETURNS
 *     Success: Index of the first new image.
 *     Failure: -1
 */

INT WINAPI
ImageList_Add (HIMAGELIST himl,	HBITMAP hbmImage, HBITMAP hbmMask)
{
    HDC     hdcBitmap;
    INT     nFirstIndex, nImageCount;
    INT     nStartX;
    BITMAP  bmp;
    HBITMAP hOldBitmap;

    TRACE("himl=%p hbmimage=%p hbmmask=%p\n", himl, hbmImage, hbmMask);
    if (!is_valid(himl))
        return -1;

    GetObjectA (hbmImage, sizeof(BITMAP), (LPVOID)&bmp);
    nImageCount = bmp.bmWidth / himl->cx;

    IMAGELIST_InternalExpandBitmaps (himl, nImageCount, bmp.bmWidth, bmp.bmHeight);

    nStartX = himl->cCurImage * himl->cx;

    hdcBitmap = CreateCompatibleDC(0);

    hOldBitmap = SelectObject(hdcBitmap, hbmImage);

    /* Copy result to the imagelist
    */
    BitBlt (himl->hdcImage, nStartX, 0, bmp.bmWidth, bmp.bmHeight,
        hdcBitmap, 0, 0, SRCCOPY);

    if(himl->hbmMask)
    {
	HDC hdcTemp;
	HBITMAP hOldBitmapTemp;

        hdcTemp   = CreateCompatibleDC(0);
        hOldBitmapTemp = SelectObject(hdcTemp, hbmMask);

        BitBlt (himl->hdcMask,
            nStartX, 0, bmp.bmWidth, bmp.bmHeight,
            hdcTemp,
            0, 0,
            SRCCOPY);

        SelectObject(hdcTemp, hOldBitmapTemp);
        DeleteDC(hdcTemp);

        /* Remove the background from the image
        */
        BitBlt (himl->hdcImage,
            nStartX, 0, bmp.bmWidth, bmp.bmHeight,
            himl->hdcMask,
            nStartX, 0,
            0x220326); /* NOTSRCAND */
    }

    SelectObject(hdcBitmap, hOldBitmap);
    DeleteDC(hdcBitmap);

    nFirstIndex = himl->cCurImage;
    himl->cCurImage += nImageCount;

    return nFirstIndex;
}


/*************************************************************************
 * ImageList_AddIcon [COMCTL32.@]
 *
 * Adds an icon to an image list.
 *
 * PARAMS
 *     himl  [I] handle to image list
 *     hIcon [I] handle to icon
 *
 * RETURNS
 *     Success: index of the new image
 *     Failure: -1
 */
#undef ImageList_AddIcon
INT WINAPI ImageList_AddIcon (HIMAGELIST himl, HICON hIcon)
{
    return ImageList_ReplaceIcon (himl, -1, hIcon);
}


/*************************************************************************
 * ImageList_AddMasked [COMCTL32.@]
 *
 * Adds an image or images to an image list and creates a mask from the
 * specified bitmap using the mask color.
 *
 * PARAMS
 *     himl    [I] handle to image list.
 *     hBitmap [I] handle to bitmap
 *     clrMask [I] mask color.
 *
 * RETURNS
 *     Success: Index of the first new image.
 *     Failure: -1
 */

INT WINAPI
ImageList_AddMasked (HIMAGELIST himl, HBITMAP hBitmap, COLORREF clrMask)
{
    HDC    hdcMask, hdcBitmap;
    INT    nIndex, nImageCount, nMaskXOffset=0;
    BITMAP bmp;
    HBITMAP hOldBitmap;
    HBITMAP hMaskBitmap=0;
    COLORREF bkColor;

    TRACE("himl=%p hbitmap=%p clrmask=%lx\n", himl, hBitmap, clrMask);
    if (!is_valid(himl))
        return -1;

    if (!GetObjectA (hBitmap, sizeof(BITMAP), &bmp))
        return -1;

    if (himl->cx > 0)
	nImageCount = bmp.bmWidth / himl->cx;
    else
	nImageCount = 0;

    IMAGELIST_InternalExpandBitmaps (himl, nImageCount, bmp.bmWidth, bmp.bmHeight);

    nIndex = himl->cCurImage;
    himl->cCurImage += nImageCount;

    hdcBitmap = CreateCompatibleDC(0);


    hOldBitmap = SelectObject(hdcBitmap, hBitmap);
    if(himl->hbmMask)
    {
        hdcMask = himl->hdcMask;
        nMaskXOffset = nIndex * himl->cx;
    }
    else
    {
        /*
            Create a temp Mask so we can remove the background of
            the Image (Windows does this even if there is no mask)
        */
        hdcMask = CreateCompatibleDC(0);
        hMaskBitmap = CreateBitmap(bmp.bmWidth, bmp.bmHeight, 1, 1, NULL);
        SelectObject(hdcMask, hMaskBitmap);
        nMaskXOffset = 0;
    }
    /* create monochrome image to the mask bitmap */
    bkColor = (clrMask != CLR_DEFAULT) ? clrMask :
        GetPixel (hdcBitmap, 0, 0);
    SetBkColor (hdcBitmap, bkColor);
    BitBlt (hdcMask,
        nMaskXOffset, 0, bmp.bmWidth, bmp.bmHeight,
        hdcBitmap, 0, 0,
        SRCCOPY);

    SetBkColor(hdcBitmap, RGB(255,255,255));
    /*Remove the background from the image
    */
    /*
        WINDOWS BUG ALERT!!!!!!
        The statement below should not be done in common practice
        but this is how ImageList_AddMasked works in Windows.
        It overwrites the original bitmap passed, this was discovered
        by using the same bitmap to iterate the different styles
        on windows where it failed (BUT ImageList_Add is OK)
        This is here in case some apps rely on this bug
    */
    BitBlt(hdcBitmap,
        0, 0, bmp.bmWidth, bmp.bmHeight,
        hdcMask,
        nMaskXOffset, 0,
        0x220326); /* NOTSRCAND */
    /* Copy result to the imagelist
    */
    BitBlt (himl->hdcImage,
        nIndex * himl->cx, 0, bmp.bmWidth, bmp.bmHeight,
        hdcBitmap,
        0, 0,
        SRCCOPY);
    /* Clean up
    */
    SelectObject(hdcBitmap, hOldBitmap);
    DeleteDC(hdcBitmap);
    if(!himl->hbmMask)
    {
        DeleteObject(hMaskBitmap);
        DeleteDC(hdcMask);
    }

    return nIndex;
}


/*************************************************************************
 * ImageList_BeginDrag [COMCTL32.@]
 *
 * Creates a temporary image list that contains one image. It will be used
 * as a drag image.
 *
 * PARAMS
 *     himlTrack [I] handle to the source image list
 *     iTrack    [I] index of the drag image in the source image list
 *     dxHotspot [I] X position of the hot spot of the drag image
 *     dyHotspot [I] Y position of the hot spot of the drag image
 *
 * RETURNS
 *     Success: TRUE
 *     Failure: FALSE
 */

BOOL WINAPI
ImageList_BeginDrag (HIMAGELIST himlTrack, INT iTrack,
	             INT dxHotspot, INT dyHotspot)
{
    INT cx, cy;

    TRACE("(himlTrack=%p iTrack=%d dx=%d dy=%d)\n", himlTrack, iTrack,
	  dxHotspot, dyHotspot);

    if (!is_valid(himlTrack))
	return FALSE;

    if (InternalDrag.himl)
        ImageList_EndDrag ();

    cx = himlTrack->cx;
    cy = himlTrack->cy;

    InternalDrag.himl = ImageList_Create (cx, cy, himlTrack->flags, 1, 1);
    if (InternalDrag.himl == NULL) {
        WARN("Error creating drag image list!\n");
        return FALSE;
    }

    InternalDrag.dxHotspot = dxHotspot;
    InternalDrag.dyHotspot = dyHotspot;

    /* copy image */
    BitBlt (InternalDrag.himl->hdcImage, 0, 0, cx, cy, himlTrack->hdcImage, iTrack * cx, 0, SRCCOPY);

    /* copy mask */
    BitBlt (InternalDrag.himl->hdcMask, 0, 0, cx, cy, himlTrack->hdcMask, iTrack * cx, 0, SRCCOPY);

    InternalDrag.himl->cCurImage = 1;

    return TRUE;
}


/*************************************************************************
 * ImageList_Copy [COMCTL32.@]
 *
 *  Copies an image of the source image list to an image of the
 *  destination image list. Images can be copied or swapped.
 *
 * PARAMS
 *     himlDst [I] handle to the destination image list
 *     iDst    [I] destination image index.
 *     himlSrc [I] handle to the source image list
 *     iSrc    [I] source image index
 *     uFlags  [I] flags for the copy operation
 *
 * RETURNS
 *     Success: TRUE
 *     Failure: FALSE
 *
 * NOTES
 *     Copying from one image list to another is possible. The original
 *     implementation just copies or swaps within one image list.
 *     Could this feature become a bug??? ;-)
 */

BOOL WINAPI
ImageList_Copy (HIMAGELIST himlDst, INT iDst,	HIMAGELIST himlSrc,
		INT iSrc, UINT uFlags)
{
    TRACE("himlDst=%p iDst=%d himlSrc=%p iSrc=%d\n", himlDst, iDst, himlSrc, iSrc);