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user32: Fixed CURSORICON_CreateIconFromBMI to preserve the alpha channel.

This commit is contained in:
Joel Holdsworth 2009-06-29 19:10:36 +01:00 committed by Alexandre Julliard
parent ee09534c27
commit c2202929ab
1 changed files with 88 additions and 61 deletions
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141
dlls/user32/cursoricon.c
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@ -659,6 +659,39 @@ static CURSORICONFILEDIRENTRY *CURSORICON_FindBestIconFile( CURSORICONFILEDIR *d
return &dir->idEntries[n];
}
/***********************************************************************
* stretch_blt_icon
*
* A helper function that stretches a bitmap buffer into an HBITMAP.
*
* PARAMS
* hDest [I] The handle of the destination bitmap.
* pDestInfo [I] The BITMAPINFO of the destination bitmap.
* pSrcInfo [I] The BITMAPINFO of the source bitmap.
* pSrcBits [I] A pointer to the source bitmap buffer.
**/
static BOOL stretch_blt_icon(HBITMAP hDest, BITMAPINFO *pDestInfo, BITMAPINFO *pSrcInfo, char *pSrcBits)
{
HBITMAP hOld;
BOOL res = FALSE;
static HDC hdcMem = NULL;
if (!hdcMem)
hdcMem = CreateCompatibleDC(screen_dc);
if (hdcMem)
{
hOld = SelectObject(hdcMem, hDest);
res = StretchDIBits(hdcMem,
0, 0, pDestInfo->bmiHeader.biWidth, pDestInfo->bmiHeader.biHeight,
0, 0, pSrcInfo->bmiHeader.biWidth, pSrcInfo->bmiHeader.biHeight,
pSrcBits, pSrcInfo, DIB_RGB_COLORS, SRCCOPY);
SelectObject(hdcMem, hOld);
}
return res;
}
static HICON CURSORICON_CreateIconFromBMI( BITMAPINFO *bmi,
POINT16 hotspot, BOOL bIcon,
DWORD dwVersion,
@ -666,12 +699,11 @@ static HICON CURSORICON_CreateIconFromBMI( BITMAPINFO *bmi,
UINT cFlag )
{
HGLOBAL16 hObj;
static HDC hdcMem;
int sizeAnd, sizeXor;
HBITMAP hAndBits = 0, hXorBits = 0; /* error condition for later */
BITMAP bmpXor, bmpAnd;
BOOL DoStretch;
INT size;
BITMAPINFO *pSrcInfo, *pDestInfo;
if (dwVersion == 0x00020000)
{
@ -693,11 +725,10 @@ static HICON CURSORICON_CreateIconFromBMI( BITMAPINFO *bmi,
if (!width) width = bmi->bmiHeader.biWidth;
if (!height) height = bmi->bmiHeader.biHeight/2;
DoStretch = (bmi->bmiHeader.biHeight/2 != height) ||
(bmi->bmiHeader.biWidth != width);
/* Scale the hotspot */
if (DoStretch && hotspot.x != ICON_HOTSPOT && hotspot.y != ICON_HOTSPOT)
if (((bmi->bmiHeader.biHeight/2 != height) || (bmi->bmiHeader.biWidth != width)) &&
hotspot.x != ICON_HOTSPOT && hotspot.y != ICON_HOTSPOT)
{
hotspot.x = (hotspot.x * width) / bmi->bmiHeader.biWidth;
hotspot.y = (hotspot.y * height) / (bmi->bmiHeader.biHeight / 2);
@ -706,8 +737,6 @@ static HICON CURSORICON_CreateIconFromBMI( BITMAPINFO *bmi,
if (!screen_dc) screen_dc = CreateDCW( DISPLAYW, NULL, NULL, NULL );
if (screen_dc)
{
BITMAPINFO* pInfo;
/* Make sure we have room for the monochrome bitmap later on.
* Note that BITMAPINFOINFO and BITMAPCOREHEADER are the same
* up to and including the biBitCount. In-memory icon resource
@ -719,40 +748,47 @@ static HICON CURSORICON_CreateIconFromBMI( BITMAPINFO *bmi,
* BYTE icAND[] // DIB bits for AND mask
*/
if ((pInfo = HeapAlloc( GetProcessHeap(), 0,
max(size, sizeof(BITMAPINFOHEADER) + 2*sizeof(RGBQUAD)))))
pSrcInfo = HeapAlloc( GetProcessHeap(), 0,
max(size, sizeof(BITMAPINFOHEADER) + 2*sizeof(RGBQUAD)));
pDestInfo = HeapAlloc( GetProcessHeap(), 0,
max(size, sizeof(BITMAPINFOHEADER) + 2*sizeof(RGBQUAD)));
if (pSrcInfo && pDestInfo)
{
memcpy( pInfo, bmi, size );
pInfo->bmiHeader.biHeight /= 2;
memcpy( pSrcInfo, bmi, size );
pSrcInfo->bmiHeader.biHeight /= 2;
memcpy( pDestInfo, bmi, size );
pDestInfo->bmiHeader.biWidth = width;
pDestInfo->bmiHeader.biHeight = height;
pDestInfo->bmiHeader.biSizeImage = 0;
/* Create the XOR bitmap */
if(pSrcInfo->bmiHeader.biBitCount == 32)
{
void *pDIBBuffer = NULL;
hXorBits = CreateDIBSection(screen_dc, pDestInfo, DIB_RGB_COLORS, &pDIBBuffer, NULL, 0);
if (DoStretch) {
hXorBits = CreateCompatibleBitmap(screen_dc, width, height);
if(hXorBits)
{
HBITMAP hOld;
BOOL res = FALSE;
if (!hdcMem) hdcMem = CreateCompatibleDC(screen_dc);
if (hdcMem) {
hOld = SelectObject(hdcMem, hXorBits);
res = StretchDIBits(hdcMem, 0, 0, width, height, 0, 0,
bmi->bmiHeader.biWidth, bmi->bmiHeader.biHeight/2,
(char*)bmi + size, pInfo, DIB_RGB_COLORS, SRCCOPY);
SelectObject(hdcMem, hOld);
if (!stretch_blt_icon(hXorBits, pDestInfo, pSrcInfo, (char*)bmi + size))
{
DeleteObject(hXorBits);
hXorBits = 0;
}
if (!res) { DeleteObject(hXorBits); hXorBits = 0; }
}
} else {
if (is_dib_monochrome(bmi)) {
hXorBits = CreateBitmap(width, height, 1, 1, NULL);
SetDIBits(screen_dc, hXorBits, 0, height,
(char*)bmi + size, pInfo, DIB_RGB_COLORS);
}
else
hXorBits = CreateDIBitmap(screen_dc, &pInfo->bmiHeader,
CBM_INIT, (char*)bmi + size, pInfo, DIB_RGB_COLORS);
{
hXorBits = CreateCompatibleBitmap(screen_dc, width, height);
if(hXorBits)
{
if(!stretch_blt_icon(hXorBits, pDestInfo, pSrcInfo, (char*)bmi + size))
{
DeleteObject(hXorBits);
hXorBits = 0;
}
}
}
if( hXorBits )
@ -761,51 +797,42 @@ static HICON CURSORICON_CreateIconFromBMI( BITMAPINFO *bmi,
get_dib_width_bytes( bmi->bmiHeader.biWidth,
bmi->bmiHeader.biBitCount ) * abs( bmi->bmiHeader.biHeight ) / 2;
pInfo->bmiHeader.biBitCount = 1;
if (pInfo->bmiHeader.biSize != sizeof(BITMAPCOREHEADER))
pSrcInfo->bmiHeader.biBitCount = 1;
if (pSrcInfo->bmiHeader.biSize != sizeof(BITMAPCOREHEADER))
{
RGBQUAD *rgb = pInfo->bmiColors;
RGBQUAD *rgb = pSrcInfo->bmiColors;
pInfo->bmiHeader.biClrUsed = pInfo->bmiHeader.biClrImportant = 2;
pSrcInfo->bmiHeader.biClrUsed = pSrcInfo->bmiHeader.biClrImportant = 2;
rgb[0].rgbBlue = rgb[0].rgbGreen = rgb[0].rgbRed = 0x00;
rgb[1].rgbBlue = rgb[1].rgbGreen = rgb[1].rgbRed = 0xff;
rgb[0].rgbReserved = rgb[1].rgbReserved = 0;
}
else
{
RGBTRIPLE *rgb = (RGBTRIPLE *)(((BITMAPCOREHEADER *)pInfo) + 1);
RGBTRIPLE *rgb = (RGBTRIPLE *)(((BITMAPCOREHEADER *)pSrcInfo) + 1);
rgb[0].rgbtBlue = rgb[0].rgbtGreen = rgb[0].rgbtRed = 0x00;
rgb[1].rgbtBlue = rgb[1].rgbtGreen = rgb[1].rgbtRed = 0xff;
}
/* Create the AND bitmap */
if (DoStretch) {
if ((hAndBits = CreateBitmap(width, height, 1, 1, NULL))) {
HBITMAP hOld;
BOOL res = FALSE;
if (!hdcMem) hdcMem = CreateCompatibleDC(screen_dc);
if (hdcMem) {
hOld = SelectObject(hdcMem, hAndBits);
res = StretchDIBits(hdcMem, 0, 0, width, height, 0, 0,
pInfo->bmiHeader.biWidth, pInfo->bmiHeader.biHeight,
xbits, pInfo, DIB_RGB_COLORS, SRCCOPY);
SelectObject(hdcMem, hOld);
}
if (!res) { DeleteObject(hAndBits); hAndBits = 0; }
}
} else {
hAndBits = CreateBitmap(width, height, 1, 1, NULL);
if (hAndBits) SetDIBits(screen_dc, hAndBits, 0, height,
xbits, pInfo, DIB_RGB_COLORS);
if(!stretch_blt_icon(hAndBits, pDestInfo, pSrcInfo, xbits))
{
DeleteObject(hAndBits);
hAndBits = 0;
}
if( !hAndBits )
{
DeleteObject( hXorBits );
hXorBits = 0;
}
if( !hAndBits ) DeleteObject( hXorBits );
}
HeapFree( GetProcessHeap(), 0, pInfo );
HeapFree( GetProcessHeap(), 0, pSrcInfo );
HeapFree( GetProcessHeap(), 0, pDestInfo );
}
}