draw.c

这是一个开放源代码的与WINNT/WIN2K/WIN2003兼容的操作系统

                if (!UXTHEME_Blt (hdcDst, xOfs, yOfs, bltWidth, bltHeight,
                                  hdcSrc, nXOriginSrc, nYOriginSrc, 
                                  transparent, transcolor))
                    return FALSE;
                xOfs += nWidthSrc;
                xRemaining -= nWidthSrc;
            }
            yOfs += nHeightSrc;
            yRemaining -= nHeightSrc;
        }
        return TRUE;
    }
    else
    {
        return UXTHEME_StretchBlt (hdcDst, nXOriginDst, nYOriginDst, nWidthDst, nHeightDst,
                                   hdcSrc, nXOriginSrc, nYOriginSrc, nWidthSrc, nHeightSrc,
                                   transparent, transcolor);
    }
}

/* Get transparency parameters passed to UXTHEME_StretchBlt() - the parameters 
 * depend on whether the image has full alpha  or whether it is 
 * color-transparent or just opaque. */
static inline void get_transparency (HTHEME hTheme, int iPartId, int iStateId, 
                                     BOOL hasImageAlpha, INT* transparent,
                                     COLORREF* transparentcolor, BOOL glyph)
{
    if (hasImageAlpha)
    {
        *transparent = ALPHABLEND_FULL;
        *transparentcolor = RGB (255, 0, 255);
    }
    else
    {
        BOOL trans = FALSE;
        GetThemeBool(hTheme, iPartId, iStateId, 
            glyph ? TMT_GLYPHTRANSPARENT : TMT_TRANSPARENT, &trans);
        if(trans) {
            *transparent = ALPHABLEND_BINARY;
            if(FAILED(GetThemeColor(hTheme, iPartId, iStateId, 
                glyph ? TMT_GLYPHTRANSPARENTCOLOR : TMT_TRANSPARENTCOLOR, 
                transparentcolor))) {
                /* If image is transparent, but no color was specified, use magenta */
                *transparentcolor = RGB(255, 0, 255);
            }
        }
        else
            *transparent = ALPHABLEND_NONE;
    }
}

/***********************************************************************
 *      UXTHEME_DrawImageGlyph
 *
 * Draw an imagefile glyph
 */
static HRESULT UXTHEME_DrawImageGlyph(HTHEME hTheme, HDC hdc, int iPartId,
                               int iStateId, RECT *pRect,
                               const DTBGOPTS *pOptions)
{
    HRESULT hr;
    HBITMAP bmpSrc = NULL;
    HDC hdcSrc = NULL;
    HGDIOBJ oldSrc = NULL;
    RECT rcSrc;
    INT transparent = FALSE;
    COLORREF transparentcolor;
    int valign = VA_CENTER;
    int halign = HA_CENTER;
    POINT dstSize;
    POINT srcSize;
    POINT topleft;
    BOOL hasAlpha;

    hr = UXTHEME_LoadImage(hTheme, hdc, iPartId, iStateId, pRect, TRUE, 
        &bmpSrc, &rcSrc, &hasAlpha);
    if(FAILED(hr)) return hr;
    hdcSrc = CreateCompatibleDC(hdc);
    if(!hdcSrc) {
        hr = HRESULT_FROM_WIN32(GetLastError());
        return hr;
    }
    oldSrc = SelectObject(hdcSrc, bmpSrc);

    dstSize.x = pRect->right-pRect->left;
    dstSize.y = pRect->bottom-pRect->top;
    srcSize.x = rcSrc.right-rcSrc.left;
    srcSize.y = rcSrc.bottom-rcSrc.top;

    get_transparency (hTheme, iPartId, iStateId, hasAlpha, &transparent,
        &transparentcolor, TRUE);
    GetThemeEnumValue(hTheme, iPartId, iStateId, TMT_VALIGN, &valign);
    GetThemeEnumValue(hTheme, iPartId, iStateId, TMT_HALIGN, &halign);

    topleft.x = pRect->left;
    topleft.y = pRect->top;
    if(halign == HA_CENTER)      topleft.x += (dstSize.x/2)-(srcSize.x/2);
    else if(halign == HA_RIGHT)  topleft.x += dstSize.x-srcSize.x;
    if(valign == VA_CENTER)      topleft.y += (dstSize.y/2)-(srcSize.y/2);
    else if(valign == VA_BOTTOM) topleft.y += dstSize.y-srcSize.y;

    if(!UXTHEME_Blt(hdc, topleft.x, topleft.y, srcSize.x, srcSize.y,
                    hdcSrc, rcSrc.left, rcSrc.top,
                    transparent, transparentcolor)) {
        hr = HRESULT_FROM_WIN32(GetLastError());
    }

    SelectObject(hdcSrc, oldSrc);
    DeleteDC(hdcSrc);
    return hr;
}

/***********************************************************************
 *      UXTHEME_DrawImageGlyph
 *
 * Draw glyph on top of background, if appropriate
 */
static HRESULT UXTHEME_DrawGlyph(HTHEME hTheme, HDC hdc, int iPartId,
                                    int iStateId, RECT *pRect,
                                    const DTBGOPTS *pOptions)
{
    int glyphtype = GT_NONE;

    GetThemeEnumValue(hTheme, iPartId, iStateId, TMT_GLYPHTYPE, &glyphtype);

    if(glyphtype == GT_IMAGEGLYPH) {
        return UXTHEME_DrawImageGlyph(hTheme, hdc, iPartId, iStateId, pRect, pOptions);
    }
    else if(glyphtype == GT_FONTGLYPH) {
        /* I don't know what a font glyph is, I've never seen it used in any themes */
        FIXME("Font glyph\n");
    }
    return S_OK;
}

/***********************************************************************
 * get_image_part_size
 *
 * Used by GetThemePartSize and UXTHEME_DrawImageBackground
 */
static HRESULT get_image_part_size (HTHEME hTheme, HDC hdc, int iPartId,
                                    int iStateId, RECT *prc, THEMESIZE eSize,
                                    POINT *psz)
{
    HRESULT hr = S_OK;
    HBITMAP bmpSrc;
    RECT rcSrc;
    BOOL hasAlpha;

    hr = UXTHEME_LoadImage(hTheme, hdc, iPartId, iStateId, prc, FALSE, 
        &bmpSrc, &rcSrc, &hasAlpha);
    if (FAILED(hr)) return hr;

    switch (eSize)
    {
        case TS_DRAW:
            if (prc != NULL)
            {
                RECT rcDst;
                POINT dstSize;
                POINT srcSize;
                int sizingtype = ST_STRETCH;
                BOOL uniformsizing = FALSE;

                CopyRect(&rcDst, prc);

                dstSize.x = rcDst.right-rcDst.left;
                dstSize.y = rcDst.bottom-rcDst.top;
                srcSize.x = rcSrc.right-rcSrc.left;
                srcSize.y = rcSrc.bottom-rcSrc.top;
            
                GetThemeBool(hTheme, iPartId, iStateId, TMT_UNIFORMSIZING, &uniformsizing);
                if(uniformsizing) {
                    /* Scale height and width equally */
                    if (dstSize.x*srcSize.y < dstSize.y*srcSize.x)
                    {
                        dstSize.y = MulDiv (srcSize.y, dstSize.x, srcSize.x);
                        rcDst.bottom = rcDst.top + dstSize.y;
                    }
                    else
                    {
                        dstSize.x = MulDiv (srcSize.x, dstSize.y, srcSize.y);
                        rcDst.right = rcDst.left + dstSize.x;
                    }
                }
            
                GetThemeEnumValue(hTheme, iPartId, iStateId, TMT_SIZINGTYPE, &sizingtype);
                if(sizingtype == ST_TRUESIZE) {
                    int truesizestretchmark = 100;
            
                    if(dstSize.x < 0 || dstSize.y < 0) {
                        BOOL mirrorimage = TRUE;
                        GetThemeBool(hTheme, iPartId, iStateId, TMT_MIRRORIMAGE, &mirrorimage);
                        if(mirrorimage) {
                            if(dstSize.x < 0) {
                                rcDst.left += dstSize.x;
                                rcDst.right += dstSize.x;
                            }
                            if(dstSize.y < 0) {
                                rcDst.top += dstSize.y;
                                rcDst.bottom += dstSize.y;
                            }
                        }
                    }
                    /* Whatever TrueSizeStretchMark does - it does not seem to
                     * be what's outlined below. It appears as if native 
                     * uxtheme always stretches if dest is smaller than source
                     * (ie as if TrueSizeStretchMark==100 with the code below) */
#if 0
                    /* Only stretch when target exceeds source by truesizestretchmark percent */
                    GetThemeInt(hTheme, iPartId, iStateId, TMT_TRUESIZESTRETCHMARK, &truesizestretchmark);
#endif
                    if(dstSize.x < 0 || dstSize.y < 0 ||
                      (MulDiv(srcSize.x, 100, dstSize.x) > truesizestretchmark &&
                      MulDiv(srcSize.y, 100, dstSize.y) > truesizestretchmark)) {
                        memcpy (psz, &dstSize, sizeof (SIZE));
                    }
                    else {
                        memcpy (psz, &srcSize, sizeof (SIZE));
                    }
                }
                else
                {
                    psz->x = abs(dstSize.x);
                    psz->y = abs(dstSize.y);
                }
                break;
            }
            /* else fall through */
        case TS_MIN:
            /* FIXME: couldn't figure how native uxtheme computes min size */
        case TS_TRUE:
            psz->x = rcSrc.right - rcSrc.left;
            psz->y = rcSrc.bottom - rcSrc.top;
            break;
    }
    return hr;
}

/***********************************************************************
 *      UXTHEME_DrawImageBackground
 *
 * Draw an imagefile background
 */
static HRESULT UXTHEME_DrawImageBackground(HTHEME hTheme, HDC hdc, int iPartId,
                                    int iStateId, RECT *pRect,
                                    const DTBGOPTS *pOptions)
{
    HRESULT hr = S_OK;
    HBITMAP bmpSrc;
    HGDIOBJ oldSrc;
    HDC hdcSrc;
    RECT rcSrc;
    RECT rcDst;
    POINT dstSize;
    POINT srcSize;
    POINT drawSize;
    int sizingtype = ST_STRETCH;
    INT transparent;
    COLORREF transparentcolor = 0;
    BOOL hasAlpha;

    hr = UXTHEME_LoadImage(hTheme, hdc, iPartId, iStateId, pRect, FALSE, 
        &bmpSrc, &rcSrc, &hasAlpha);
    if(FAILED(hr)) return hr;
    hdcSrc = CreateCompatibleDC(hdc);
    if(!hdcSrc) {
        hr = HRESULT_FROM_WIN32(GetLastError());
        return hr;
    }
    oldSrc = SelectObject(hdcSrc, bmpSrc);

    CopyRect(&rcDst, pRect);
    
    get_transparency (hTheme, iPartId, iStateId, hasAlpha, &transparent,
        &transparentcolor, FALSE);

    dstSize.x = rcDst.right-rcDst.left;
    dstSize.y = rcDst.bottom-rcDst.top;
    srcSize.x = rcSrc.right-rcSrc.left;
    srcSize.y = rcSrc.bottom-rcSrc.top;

    GetThemeEnumValue(hTheme, iPartId, iStateId, TMT_SIZINGTYPE, &sizingtype);
    if(sizingtype == ST_TRUESIZE) {
        int valign = VA_CENTER, halign = HA_CENTER;

        get_image_part_size (hTheme, hdc, iPartId, iStateId, pRect, TS_DRAW, &drawSize);
        GetThemeEnumValue(hTheme, iPartId, iStateId, TMT_VALIGN, &valign);
        GetThemeEnumValue(hTheme, iPartId, iStateId, TMT_HALIGN, &halign);

        if (halign == HA_CENTER)
            rcDst.left += (dstSize.x/2)-(drawSize.x/2);
        else if (halign == HA_RIGHT)
            rcDst.left = rcDst.right - drawSize.x;
        if (valign == VA_CENTER)
            rcDst.top  += (dstSize.y/2)-(drawSize.y/2);
        else if (valign == VA_BOTTOM)
            rcDst.top = rcDst.bottom - drawSize.y;
        rcDst.right = rcDst.left + drawSize.x;
        rcDst.bottom = rcDst.top + drawSize.y;
        if(!UXTHEME_StretchBlt(hdc, rcDst.left, rcDst.top, drawSize.x, drawSize.y,
                                hdcSrc, rcSrc.left, rcSrc.top, srcSize.x, srcSize.y,
                                transparent, transparentcolor))
            hr = HRESULT_FROM_WIN32(GetLastError());
    }
    else {
        HDC hdcDst = NULL;
        MARGINS sm;
        POINT org;

        dstSize.x = abs(dstSize.x);
        dstSize.y = abs(dstSize.y);

        GetThemeMargins(hTheme, hdc, iPartId, iStateId, TMT_SIZINGMARGINS, NULL, &sm);

        hdcDst = hdc;
        OffsetViewportOrgEx(hdcDst, rcDst.left, rcDst.top, &org);

        /* Upper left corner */
        if(!UXTHEME_Blt(hdcDst, 0, 0, sm.cxLeftWidth, sm.cyTopHeight,
                        hdcSrc, rcSrc.left, rcSrc.top, 
                        transparent, transparentcolor)) {
            hr = HRESULT_FROM_WIN32(GetLastError());
            goto draw_error; 
        }
        /* Upper right corner */
        if(!UXTHEME_Blt (hdcDst, dstSize.x-sm.cxRightWidth, 0, 
                         sm.cxRightWidth, sm.cyTopHeight,
                         hdcSrc, rcSrc.right-sm.cxRightWidth, rcSrc.top, 
                         transparent, transparentcolor)) {
            hr = HRESULT_FROM_WIN32(GetLastError());
            goto draw_error; 
        }
        /* Lower left corner */
        if(!UXTHEME_Blt (hdcDst, 0, dstSize.y-sm.cyBottomHeight, 
                         sm.cxLeftWidth, sm.cyBottomHeight,
                         hdcSrc, rcSrc.left, rcSrc.bottom-sm.cyBottomHeight, 
                         transparent, transparentcolor)) {
            hr = HRESULT_FROM_WIN32(GetLastError());
            goto draw_error; 
        }
        /* Lower right corner */
        if(!UXTHEME_Blt (hdcDst, dstSize.x-sm.cxRightWidth, dstSize.y-sm.cyBottomHeight, 
                         sm.cxRightWidth, sm.cyBottomHeight,
                         hdcSrc, rcSrc.right-sm.cxRightWidth, rcSrc.bottom-sm.cyBottomHeight, 
                         transparent, transparentcolor)) {
            hr = HRESULT_FROM_WIN32(GetLastError());
            goto draw_error; 
        }

        if ((sizingtype == ST_STRETCH) || (sizingtype == ST_TILE)) {
            int destCenterWidth  = dstSize.x - (sm.cxLeftWidth + sm.cxRightWidth);