Alexandre Julliard : user32: Store a pre-computed alpha bitmap for 32-bpp icons with an alpha channel.
Module: wine Branch: master Commit: bb33cebe3f7b24759aa47238a33197bbf73cfcb1 URL: http://source.winehq.org/git/wine.git/?a=commit;h=bb33cebe3f7b24759aa47238a3...
Author: Alexandre Julliard julliard@winehq.org Date: Wed May 19 12:14:03 2010 +0200
user32: Store a pre-computed alpha bitmap for 32-bpp icons with an alpha channel.
---
dlls/user32/cursoricon.c | 104 ++++++++++++++++++++++++++++++++++++++++++++-- 1 files changed, 100 insertions(+), 4 deletions(-)
diff --git a/dlls/user32/cursoricon.c b/dlls/user32/cursoricon.c index 24099a8..1454260 100644 --- a/dlls/user32/cursoricon.c +++ b/dlls/user32/cursoricon.c @@ -136,6 +136,7 @@ struct cursoricon_object struct user_object obj; /* object header */ ULONG_PTR param; /* opaque param used by 16-bit code */ HBITMAP color; /* color bitmap */ + HBITMAP alpha; /* pre-multiplied alpha bitmap for 32-bpp icons */ HBITMAP mask; /* mask bitmap (followed by color for 1-bpp icons) */ CURSORICONINFO data; /* followed by cursor bits in CURSORICONINFO format */ @@ -147,6 +148,7 @@ static HICON alloc_icon_handle( unsigned int size ) if (!obj) return 0; obj->param = 0; obj->color = 0; + obj->alpha = 0; obj->mask = 0; return alloc_user_handle( &obj->obj, USER_ICON ); } @@ -176,6 +178,7 @@ static BOOL free_icon_handle( HICON handle ) { ULONG_PTR param = obj->param; if (obj->color) DeleteObject( obj->color ); + if (obj->alpha) DeleteObject( obj->alpha ); DeleteObject( obj->mask ); HeapFree( GetProcessHeap(), 0, obj ); if (wow_handlers.free_icon_param && param) wow_handlers.free_icon_param( param ); @@ -775,12 +778,96 @@ static BOOL stretch_blt_icon(HBITMAP hDest, BITMAPINFO *pDestInfo, BITMAPINFO *p }
/*********************************************************************** + * bmi_has_alpha + */ +static BOOL bmi_has_alpha( const BITMAPINFO *info, const void *bits ) +{ + int i; + BOOL has_alpha = FALSE; + const unsigned char *ptr = bits; + + if (info->bmiHeader.biBitCount != 32) return FALSE; + for (i = 0; i < info->bmiHeader.biWidth * abs(info->bmiHeader.biHeight); i++, ptr += 4) + if ((has_alpha = (ptr[3] != 0))) break; + return has_alpha; +} + +/*********************************************************************** + * create_alpha_bitmap + * + * Create the alpha bitmap for a 32-bpp icon that has an alpha channel. + */ +static HBITMAP create_alpha_bitmap( HBITMAP color, HBITMAP mask, + const BITMAPINFO *src_info, const void *color_bits ) +{ + HBITMAP alpha = 0; + BITMAPINFO *info = NULL; + BITMAP bm; + HDC hdc; + void *bits; + unsigned char *ptr; + int i; + + if (!GetObjectW( color, sizeof(bm), &bm )) return 0; + if (bm.bmBitsPixel != 32) return 0; + + if (!(hdc = CreateCompatibleDC( 0 ))) return 0; + if (!(info = HeapAlloc( GetProcessHeap(), 0, FIELD_OFFSET( BITMAPINFO, bmiColors[256] )))) goto done; + info->bmiHeader.biSize = sizeof(BITMAPINFOHEADER); + info->bmiHeader.biWidth = bm.bmWidth; + info->bmiHeader.biHeight = -bm.bmHeight; + info->bmiHeader.biPlanes = 1; + info->bmiHeader.biBitCount = 32; + info->bmiHeader.biCompression = BI_RGB; + info->bmiHeader.biSizeImage = bm.bmWidth * bm.bmHeight * 4; + info->bmiHeader.biXPelsPerMeter = 0; + info->bmiHeader.biYPelsPerMeter = 0; + info->bmiHeader.biClrUsed = 0; + info->bmiHeader.biClrImportant = 0; + if (!(alpha = CreateDIBSection( hdc, info, DIB_RGB_COLORS, &bits, NULL, 0 ))) goto done; + + if (src_info) + { + SelectObject( hdc, alpha ); + StretchDIBits( hdc, 0, 0, bm.bmWidth, bm.bmHeight, + 0, 0, src_info->bmiHeader.biWidth, src_info->bmiHeader.biHeight, + color_bits, src_info, DIB_RGB_COLORS, SRCCOPY ); + + } + else + { + GetDIBits( hdc, color, 0, bm.bmHeight, bits, info, DIB_RGB_COLORS ); + if (!bmi_has_alpha( info, bits )) + { + DeleteObject( alpha ); + alpha = 0; + goto done; + } + } + + /* pre-multiply by alpha */ + for (i = 0, ptr = bits; i < bm.bmWidth * bm.bmHeight; i++, ptr += 4) + { + unsigned int alpha = ptr[3]; + ptr[0] = ptr[0] * alpha / 255; + ptr[1] = ptr[1] * alpha / 255; + ptr[2] = ptr[2] * alpha / 255; + } + +done: + DeleteDC( hdc ); + HeapFree( GetProcessHeap(), 0, info ); + return alpha; +} + + +/*********************************************************************** * create_icon_bitmaps * - * Create the color and mask bitmaps from the DIB info. + * Create the color, mask and alpha bitmaps from the DIB info. */ static BOOL create_icon_bitmaps( const BITMAPINFO *bmi, int width, int height, - HBITMAP *color, HBITMAP *mask ) + HBITMAP *color, HBITMAP *mask, HBITMAP *alpha ) { BOOL monochrome = is_dib_monochrome( bmi ); unsigned int size = bitmap_info_size( bmi, DIB_RGB_COLORS ); @@ -801,6 +888,7 @@ static BOOL create_icon_bitmaps( const BITMAPINFO *bmi, int width, int height, get_dib_width_bytes( bmi->bmiHeader.biWidth, bmi->bmiHeader.biBitCount ) * abs(info->bmiHeader.biHeight);
+ *alpha = 0; if (monochrome) { if (!(*mask = CreateBitmap( width, height * 2, 1, 1, NULL ))) goto done; @@ -826,6 +914,9 @@ static BOOL create_icon_bitmaps( const BITMAPINFO *bmi, int width, int height, 0, 0, info->bmiHeader.biWidth, info->bmiHeader.biHeight, color_bits, info, DIB_RGB_COLORS, SRCCOPY );
+ if (bmi_has_alpha( info, color_bits )) + *alpha = create_alpha_bitmap( *color, *mask, info, color_bits ); + /* convert info to monochrome to copy the mask */ info->bmiHeader.biBitCount = 1; if (info->bmiHeader.biSize != sizeof(BITMAPCOREHEADER)) @@ -866,7 +957,7 @@ static HICON CURSORICON_CreateIconFromBMI( BITMAPINFO *bmi, { HICON hObj; int sizeAnd, sizeXor; - HBITMAP color = 0, mask = 0, hAndBits = 0, hXorBits = 0; /* error condition for later */ + HBITMAP color = 0, mask = 0, alpha = 0, hAndBits = 0, hXorBits = 0; /* error condition for later */ BITMAP bmpXor, bmpAnd; BOOL do_stretch; INT size; @@ -905,7 +996,7 @@ static HICON CURSORICON_CreateIconFromBMI( BITMAPINFO *bmi, if (!screen_dc) screen_dc = CreateDCW( DISPLAYW, NULL, NULL, NULL ); if (!screen_dc) return 0;
- if (create_icon_bitmaps( bmi, width, height, &color, &mask )) + if (create_icon_bitmaps( bmi, width, height, &color, &mask, &alpha )) { /* Make sure we have room for the monochrome bitmap later on. * Note that BITMAPINFOINFO and BITMAPCOREHEADER are the same @@ -1033,6 +1124,7 @@ static HICON CURSORICON_CreateIconFromBMI( BITMAPINFO *bmi, { WARN_(cursor)("\tunable to create an icon bitmap.\n"); DeleteObject( color ); + DeleteObject( alpha ); DeleteObject( mask ); return 0; } @@ -1050,6 +1142,7 @@ static HICON CURSORICON_CreateIconFromBMI( BITMAPINFO *bmi,
info->color = color; info->mask = mask; + info->alpha = alpha; info->data.ptHotSpot.x = hotspot.x; info->data.ptHotSpot.y = hotspot.y; info->data.nWidth = bmpXor.bmWidth; @@ -1068,6 +1161,7 @@ static HICON CURSORICON_CreateIconFromBMI( BITMAPINFO *bmi, else { DeleteObject( color ); + DeleteObject( alpha ); DeleteObject( mask ); }
@@ -1678,6 +1772,7 @@ HICON WINAPI CopyIcon( HICON hIcon ) ptrNew = get_icon_ptr( hNew ); memcpy( &ptrNew->data, &ptrOld->data, sizeof(ptrNew->data) + size ); ptrNew->color = copy_bitmap( ptrOld->color ); + ptrNew->alpha = copy_bitmap( ptrOld->alpha ); ptrNew->mask = copy_bitmap( ptrOld->mask ); release_icon_ptr( hIcon, ptrOld ); release_icon_ptr( hNew, ptrNew ); @@ -2149,6 +2244,7 @@ HICON WINAPI CreateIconIndirect(PICONINFO iconinfo)
info->color = color; info->mask = mask; + info->alpha = create_alpha_bitmap( iconinfo->hbmColor, mask, NULL, NULL );
/* If we are creating an icon, the hotspot is unused */ if (iconinfo->fIcon)
-
Alexandre Julliard