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comctl32: Apply the imagelist mask when alpha blending.

This commit is contained in:
Alexandre Julliard 2010-05-10 17:46:05 +02:00
parent 0f82f68734
commit 8ea1f3385a
1 changed files with 66 additions and 12 deletions
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78
dlls/comctl32/imagelist.c
View File

@ -815,10 +815,7 @@ ImageList_InternalDragDraw (HDC hdc, INT x, INT y)
imldp.rgbFg = CLR_DEFAULT;
imldp.fStyle = ILD_NORMAL;
imldp.fState = ILS_ALPHA;
imldp.Frame = 128;
/* FIXME: instead of using the alpha blending, we should
* create a 50% mask, and draw it semitransparantly that way */
imldp.Frame = 192;
ImageList_DrawIndirect (&imldp);
}
@ -1064,6 +1061,68 @@ 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, int alpha )
{
BLENDFUNCTION func;
BOOL ret = FALSE;
HDC hdc;
HBITMAP bmp = 0, mask = 0;
BITMAPINFO *info;
void *bits, *mask_bits;
unsigned int *ptr;
int i, j, has_alpha = 0;
if (!(hdc = CreateCompatibleDC( 0 ))) return FALSE;
if (!(info = HeapAlloc( GetProcessHeap(), 0, FIELD_OFFSET( BITMAPINFO, bmiColors[256] )))) goto done;
info->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
info->bmiHeader.biWidth = cx;
info->bmiHeader.biHeight = cy;
info->bmiHeader.biPlanes = 1;
info->bmiHeader.biBitCount = 32;
info->bmiHeader.biCompression = BI_RGB;
info->bmiHeader.biSizeImage = cx * cy * 4;
info->bmiHeader.biXPelsPerMeter = 0;
info->bmiHeader.biYPelsPerMeter = 0;
info->bmiHeader.biClrUsed = 0;
info->bmiHeader.biClrImportant = 0;
if (!(bmp = CreateDIBSection( himl->hdcImage, info, DIB_RGB_COLORS, &bits, 0, 0 ))) goto done;
SelectObject( hdc, bmp );
BitBlt( hdc, 0, 0, cx, cy, himl->hdcImage, src_x, src_y, SRCCOPY );
for (i = 0, ptr = bits; i < cx * cy; i++) if ((has_alpha = (ptr[i] & 0xff000000) != 0)) break;
if (himl->hbmMask)
{
unsigned int width_bytes = (cx + 31) / 32 * 4;
/* generate alpha channel from the mask */
info->bmiHeader.biBitCount = 1;
info->bmiHeader.biSizeImage = width_bytes * cy;
if (!(mask = CreateDIBSection( himl->hdcMask, info, DIB_RGB_COLORS, &mask_bits, 0, 0 )))
goto done;
SelectObject( hdc, mask );
BitBlt( hdc, 0, 0, cx, cy, himl->hdcMask, src_x, src_y, SRCCOPY );
SelectObject( hdc, bmp );
for (i = 0, ptr = bits; i < cy; i++)
for (j = 0; j < cx; j++, ptr++)
if ((((BYTE *)mask_bits)[i * width_bytes + j / 8] << (j % 8)) & 0x80) *ptr = 0;
else if (!has_alpha) *ptr |= 0xff000000;
}
func.BlendOp = AC_SRC_OVER;
func.BlendFlags = 0;
func.SourceConstantAlpha = alpha;
func.AlphaFormat = AC_SRC_ALPHA;
ret = GdiAlphaBlend( dest_dc, dest_x, dest_y, cx, cy, hdc, 0, 0, cx, cy, func );
done:
DeleteDC( hdc );
if (bmp) DeleteObject( bmp );
if (mask) DeleteObject( mask );
HeapFree( GetProcessHeap(), 0, info );
return ret;
}
/*************************************************************************
* ImageList_DrawIndirect [COMCTL32.@]
*
@ -1141,17 +1200,12 @@ ImageList_DrawIndirect (IMAGELISTDRAWPARAMS *pimldp)
if (fState & ILS_ALPHA)
{
BLENDFUNCTION func;
COLORREF colour;
func.BlendOp = AC_SRC_OVER;
func.BlendFlags = 0;
func.SourceConstantAlpha = pimldp->Frame;
func.AlphaFormat = AC_SRC_ALPHA;
if (bIsTransparent)
{
bResult = GdiAlphaBlend( pimldp->hdcDst, pimldp->x, pimldp->y, cx, cy,
hImageListDC, pt.x, pt.y, cx, cy, func );
bResult = alpha_blend_image( himl, pimldp->hdcDst, pimldp->x, pimldp->y,
pt.x, pt.y, cx, cy, pimldp->Frame );
goto end;
}
colour = pimldp->rgbBk;
@ -1160,7 +1214,7 @@ ImageList_DrawIndirect (IMAGELISTDRAWPARAMS *pimldp)
hOldBrush = SelectObject (hImageDC, CreateSolidBrush (colour));
PatBlt( hImageDC, 0, 0, cx, cy, PATCOPY );
GdiAlphaBlend( hImageDC, 0, 0, cx, cy, hImageListDC, pt.x, pt.y, cx, cy, func );
alpha_blend_image( himl, hImageDC, 0, 0, pt.x, pt.y, cx, cy, pimldp->Frame );
DeleteObject (SelectObject (hImageDC, hOldBrush));
bResult = BitBlt( pimldp->hdcDst, pimldp->x, pimldp->y, cx, cy, hImageDC, 0, 0, SRCCOPY );
goto end;