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comctl32/imagelist: Add support for 25% and 50% blending when using an alpha channel.

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This commit is contained in:
Alexandre Julliard 2010-05-26 15:39:17 +02:00
parent 7ea98f680d
commit 5572fc57ef
1 changed files with 36 additions and 4 deletions
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40
dlls/comctl32/imagelist.c
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@ -1157,7 +1157,8 @@ ImageList_DrawEx (HIMAGELIST himl, INT i, HDC hdc, INT x, INT y,
static BOOL alpha_blend_image( HIMAGELIST himl, HDC dest_dc, int dest_x, int dest_y,
int src_x, int src_y, int cx, int cy, BLENDFUNCTION func )
int src_x, int src_y, int cx, int cy, BLENDFUNCTION func,
UINT style, COLORREF blend_col )
{
BOOL ret = FALSE;
HDC hdc;
@ -1184,6 +1185,30 @@ static BOOL alpha_blend_image( HIMAGELIST himl, HDC dest_dc, int dest_x, int des
SelectObject( hdc, bmp );
BitBlt( hdc, 0, 0, cx, cy, himl->hdcImage, src_x, src_y, SRCCOPY );
if (blend_col != CLR_NONE)
{
BYTE r = GetRValue( blend_col );
BYTE g = GetGValue( blend_col );
BYTE b = GetBValue( blend_col );
if (style & ILD_BLEND25)
{
for (i = 0, ptr = bits; i < cx * cy; i++, ptr++)
*ptr = ((*ptr & 0xff000000) |
((((*ptr & 0x00ff0000) * 3 + (r << 16)) / 4) & 0x00ff0000) |
((((*ptr & 0x0000ff00) * 3 + (g << 8)) / 4) & 0x0000ff00) |
((((*ptr & 0x000000ff) * 3 + (b << 0)) / 4) & 0x000000ff));
}
else if (style & ILD_BLEND50)
{
for (i = 0, ptr = bits; i < cx * cy; i++, ptr++)
*ptr = ((*ptr & 0xff000000) |
((((*ptr & 0x00ff0000) + (r << 16)) / 2) & 0x00ff0000) |
((((*ptr & 0x0000ff00) + (g << 8)) / 2) & 0x0000ff00) |
((((*ptr & 0x000000ff) + (b << 0)) / 2) & 0x000000ff));
}
}
if (himl->uBitsPixel == 32) /* we already have an alpha channel in this case */
{
/* pre-multiply by the alpha channel */
@ -1302,9 +1327,16 @@ ImageList_DrawIndirect (IMAGELISTDRAWPARAMS *pimldp)
has_alpha = (himl->has_alpha && himl->has_alpha[pimldp->i]);
if (!bMask && (has_alpha || (fState & ILS_ALPHA)))
{
COLORREF colour;
COLORREF colour, blend_col = CLR_NONE;
BLENDFUNCTION func;
if (bBlend)
{
blend_col = pimldp->rgbFg;
if (blend_col == CLR_DEFAULT) blend_col = GetSysColor( COLOR_HIGHLIGHT );
else if (blend_col == CLR_NONE) blend_col = GetTextColor( pimldp->hdcDst );
}
func.BlendOp = AC_SRC_OVER;
func.BlendFlags = 0;
func.SourceConstantAlpha = (fState & ILS_ALPHA) ? pimldp->Frame : 255;
@ -1313,7 +1345,7 @@ ImageList_DrawIndirect (IMAGELISTDRAWPARAMS *pimldp)
if (bIsTransparent)
{
bResult = alpha_blend_image( himl, pimldp->hdcDst, pimldp->x, pimldp->y,
pt.x, pt.y, cx, cy, func );
pt.x, pt.y, cx, cy, func, fStyle, blend_col );
goto end;
}
colour = pimldp->rgbBk;
@ -1322,7 +1354,7 @@ ImageList_DrawIndirect (IMAGELISTDRAWPARAMS *pimldp)
hOldBrush = SelectObject (hImageDC, CreateSolidBrush (colour));
PatBlt( hImageDC, 0, 0, cx, cy, PATCOPY );
alpha_blend_image( himl, hImageDC, 0, 0, pt.x, pt.y, cx, cy, func );
alpha_blend_image( himl, hImageDC, 0, 0, pt.x, pt.y, cx, cy, func, fStyle, blend_col );
DeleteObject (SelectObject (hImageDC, hOldBrush));
bResult = BitBlt( pimldp->hdcDst, pimldp->x, pimldp->y, cx, cy, hImageDC, 0, 0, SRCCOPY );
goto end;