user32: Use the stored color and mask bitmaps instead of the raw bits in DrawIconEx.
This commit is contained in:
Alexandre Julliard
parent
bb33cebe3f
commit
072d0b3483
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@ -1807,74 +1807,6 @@ BOOL WINAPI DestroyCursor( HCURSOR hCursor )
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return DestroyIcon( hCursor );
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}
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/***********************************************************************
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* bitmap_has_alpha_channel
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*
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* Analyses bits bitmap to determine if alpha data is present.
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*
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* PARAMS
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* bpp [I] The bits-per-pixel of the bitmap
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* bitmapBits [I] A pointer to the bitmap data
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* bitmapLength [I] The length of the bitmap in bytes
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*
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* RETURNS
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* TRUE if an alpha channel is discovered, FALSE
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*
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* NOTE
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* Windows' behaviour is that if the icon bitmap is 32-bit and at
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* least one pixel has a non-zero alpha, then the bitmap is a
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* treated as having an alpha channel transparentcy. Otherwise,
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* it's treated as being completely opaque.
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*
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*/
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static BOOL bitmap_has_alpha_channel( int bpp, unsigned char *bitmapBits,
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unsigned int bitmapLength )
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{
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/* Detect an alpha channel by looking for non-zero alpha pixels */
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if(bpp == 32)
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{
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unsigned int offset;
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for(offset = 3; offset < bitmapLength; offset += 4)
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{
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if(bitmapBits[offset] != 0)
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{
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return TRUE;
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}
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}
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}
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return FALSE;
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}
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/***********************************************************************
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* premultiply_alpha_channel
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*
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* Premultiplies the color channels of a 32-bit bitmap by the alpha
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* channel. This is a necessary step that must be carried out on
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* the image before it is passed to GdiAlphaBlend
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*
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* PARAMS
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* destBitmap [I] The destination bitmap buffer
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* srcBitmap [I] The source bitmap buffer
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* bitmapLength [I] The length of the bitmap in bytes
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*
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*/
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static void premultiply_alpha_channel( unsigned char *destBitmap,
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unsigned char *srcBitmap,
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unsigned int bitmapLength )
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{
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unsigned char *destPixel = destBitmap;
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unsigned char *srcPixel = srcBitmap;
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while(destPixel < destBitmap + bitmapLength)
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{
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unsigned char alpha = srcPixel[3];
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*(destPixel++) = *(srcPixel++) * alpha / 255;
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*(destPixel++) = *(srcPixel++) * alpha / 255;
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*(destPixel++) = *(srcPixel++) * alpha / 255;
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*(destPixel++) = *(srcPixel++);
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}
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}
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/***********************************************************************
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* DrawIcon (USER32.@)
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*/
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@ -2357,12 +2289,11 @@ BOOL WINAPI DrawIconEx( HDC hdc, INT x0, INT y0, HICON hIcon,
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HBRUSH hbr, UINT flags )
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{
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struct cursoricon_object *ptr;
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HDC hDC_off = 0, hMemDC;
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HDC hdc_dest, hMemDC;
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BOOL result = FALSE, DoOffscreen;
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HBITMAP hB_off = 0, hOld = 0;
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unsigned char *xorBitmapBits;
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unsigned int xorLength;
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BOOL has_alpha = FALSE;
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HBITMAP hB_off = 0;
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COLORREF oldFg, oldBg;
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INT x, y, nStretchMode;
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TRACE_(icon)("(hdc=%p,pos=%d.%d,hicon=%p,extend=%d.%d,istep=%d,br=%p,flags=0x%08x)\n",
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hdc,x0,y0,hIcon,cxWidth,cyWidth,istep,hbr,flags );
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@ -2379,15 +2310,6 @@ BOOL WINAPI DrawIconEx( HDC hdc, INT x0, INT y0, HICON hIcon,
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if (flags & DI_NOMIRROR)
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FIXME_(icon)("Ignoring flag DI_NOMIRROR\n");
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xorLength = ptr->data.nHeight * get_bitmap_width_bytes(
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ptr->data.nWidth, ptr->data.bBitsPerPixel);
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xorBitmapBits = (unsigned char *)(ptr + 1) + ptr->data.nHeight *
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get_bitmap_width_bytes(ptr->data.nWidth, 1);
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if (flags & DI_IMAGE)
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has_alpha = bitmap_has_alpha_channel(
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ptr->data.bBitsPerPixel, xorBitmapBits, xorLength);
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/* Calculate the size of the destination image. */
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if (cxWidth == 0)
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{
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@ -2414,121 +2336,71 @@ BOOL WINAPI DrawIconEx( HDC hdc, INT x0, INT y0, HICON hIcon,
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r.right = cxWidth;
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r.bottom = cxWidth;
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hDC_off = CreateCompatibleDC(hdc);
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hB_off = CreateCompatibleBitmap(hdc, cxWidth, cyWidth);
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if (hDC_off && hB_off) {
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hOld = SelectObject(hDC_off, hB_off);
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FillRect(hDC_off, &r, hbr);
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}
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}
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if (hMemDC && (!DoOffscreen || (hDC_off && hB_off)))
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if (!(hdc_dest = CreateCompatibleDC(hdc))) goto done;
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if (!(hB_off = CreateCompatibleBitmap(hdc, cxWidth, cyWidth)))
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{
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HBITMAP hBitTemp;
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HBITMAP hXorBits = NULL, hAndBits = NULL;
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COLORREF oldFg, oldBg;
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INT nStretchMode;
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DeleteDC( hdc_dest );
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goto done;
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}
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SelectObject(hdc_dest, hB_off);
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FillRect(hdc_dest, &r, hbr);
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x = y = 0;
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}
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else
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{
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hdc_dest = hdc;
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x = x0;
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y = y0;
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}
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nStretchMode = SetStretchBltMode (hdc, STRETCH_DELETESCANS);
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oldFg = SetTextColor( hdc, RGB(0,0,0) );
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oldBg = SetBkColor( hdc, RGB(255,255,255) );
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if ((flags & DI_MASK) && !has_alpha)
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if ((flags & DI_MASK) && (!ptr->alpha || !(flags & DI_IMAGE)))
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{
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hAndBits = CreateBitmap ( ptr->data.nWidth, ptr->data.nHeight, 1, 1, ptr + 1 );
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if (hAndBits)
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{
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hBitTemp = SelectObject( hMemDC, hAndBits );
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if (DoOffscreen)
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StretchBlt (hDC_off, 0, 0, cxWidth, cyWidth,
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hMemDC, 0, 0, ptr->data.nWidth, ptr->data.nHeight, SRCAND);
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else
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StretchBlt (hdc, x0, y0, cxWidth, cyWidth,
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hMemDC, 0, 0, ptr->data.nWidth, ptr->data.nHeight, SRCAND);
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SelectObject( hMemDC, hBitTemp );
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}
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SelectObject( hMemDC, ptr->mask );
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StretchBlt( hdc_dest, x, y, cxWidth, cyWidth,
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hMemDC, 0, 0, ptr->data.nWidth, ptr->data.nHeight, SRCAND );
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}
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if (flags & DI_IMAGE)
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{
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if (ptr->data.bPlanes * ptr->data.bBitsPerPixel == 1)
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{
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hXorBits = CreateBitmap( ptr->data.nWidth, ptr->data.nHeight, 1, 1, xorBitmapBits );
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}
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else
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{
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unsigned char *dibBits;
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BITMAPINFO *bmi = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY,
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FIELD_OFFSET( BITMAPINFO, bmiColors[256] ));
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bmi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
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bmi->bmiHeader.biWidth = ptr->data.nWidth;
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bmi->bmiHeader.biHeight = -ptr->data.nHeight;
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bmi->bmiHeader.biPlanes = ptr->data.bPlanes;
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bmi->bmiHeader.biBitCount = ptr->data.bBitsPerPixel;
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bmi->bmiHeader.biCompression = BI_RGB;
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/* FIXME: color table */
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hXorBits = CreateDIBSection(hdc, bmi, DIB_RGB_COLORS, (void*)&dibBits, NULL, 0);
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if (hXorBits)
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{
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if(has_alpha)
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premultiply_alpha_channel(dibBits, xorBitmapBits, xorLength);
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else
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memcpy(dibBits, xorBitmapBits, xorLength);
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}
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}
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if (hXorBits)
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{
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if(has_alpha)
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if (ptr->alpha)
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{
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BLENDFUNCTION pixelblend = { AC_SRC_OVER, 0, 255, AC_SRC_ALPHA };
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/* Do the alpha blending render */
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hBitTemp = SelectObject( hMemDC, hXorBits );
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if (DoOffscreen)
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GdiAlphaBlend(hDC_off, 0, 0, cxWidth, cyWidth, hMemDC,
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0, 0, ptr->data.nWidth, ptr->data.nHeight, pixelblend);
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else
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GdiAlphaBlend(hdc, x0, y0, cxWidth, cyWidth, hMemDC,
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0, 0, ptr->data.nWidth, ptr->data.nHeight, pixelblend);
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SelectObject( hMemDC, hBitTemp );
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SelectObject( hMemDC, ptr->alpha );
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GdiAlphaBlend( hdc_dest, x, y, cxWidth, cyWidth, hMemDC,
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0, 0, ptr->data.nWidth, ptr->data.nHeight, pixelblend );
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}
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else if (ptr->color)
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{
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DWORD rop = (flags & DI_MASK) ? SRCINVERT : SRCCOPY;
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SelectObject( hMemDC, ptr->color );
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StretchBlt( hdc_dest, x, y, cxWidth, cyWidth,
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hMemDC, 0, 0, ptr->data.nWidth, ptr->data.nHeight, rop );
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}
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else
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{
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DWORD rop = (flags & DI_MASK) ? SRCINVERT : SRCCOPY;
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hBitTemp = SelectObject( hMemDC, hXorBits );
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if (DoOffscreen)
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StretchBlt (hDC_off, 0, 0, cxWidth, cyWidth,
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hMemDC, 0, 0, ptr->data.nWidth, ptr->data.nHeight, rop);
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else
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StretchBlt (hdc, x0, y0, cxWidth, cyWidth,
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hMemDC, 0, 0, ptr->data.nWidth, ptr->data.nHeight, rop);
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SelectObject( hMemDC, hBitTemp );
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}
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DeleteObject( hXorBits );
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SelectObject( hMemDC, ptr->mask );
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StretchBlt( hdc_dest, x, y, cxWidth, cyWidth,
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hMemDC, 0, ptr->data.nHeight, ptr->data.nWidth, ptr->data.nHeight, rop );
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}
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}
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result = TRUE;
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if (DoOffscreen) BitBlt( hdc, x0, y0, cxWidth, cyWidth, hdc_dest, 0, 0, SRCCOPY );
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SetTextColor( hdc, oldFg );
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SetBkColor( hdc, oldBg );
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if (hAndBits) DeleteObject( hAndBits );
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SetStretchBltMode (hdc, nStretchMode);
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if (DoOffscreen) {
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BitBlt(hdc, x0, y0, cxWidth, cyWidth, hDC_off, 0, 0, SRCCOPY);
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SelectObject(hDC_off, hOld);
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}
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}
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if (hMemDC) DeleteDC( hMemDC );
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if (hDC_off) DeleteDC(hDC_off);
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result = TRUE;
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if (hdc_dest != hdc) DeleteDC( hdc_dest );
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if (hB_off) DeleteObject(hB_off);
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done:
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DeleteDC( hMemDC );
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release_icon_ptr( hIcon, ptr );
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return result;
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}
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