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gdi32: Add a helper to sanitize a BITMAPINFO structure.

This commit is contained in:
Huw Davies 2011-07-22 15:09:58 +01:00 committed by Alexandre Julliard
parent 69f9006889
commit 6ce6f890be
1 changed files with 82 additions and 3 deletions
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85
dlls/gdi32/dib.c
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@ -136,6 +136,79 @@ int DIB_GetBitmapInfo( const BITMAPINFOHEADER *header, LONG *width,
return -1;
}
/*******************************************************************************************
* Fill out a true BITMAPINFO from a variable sized BITMAPINFO / BITMAPCOREINFO.
*/
static BOOL bitmapinfo_from_user_bitmapinfo( BITMAPINFO *dst, const BITMAPINFO *info, UINT coloruse )
{
LONG width, height;
WORD planes, bpp;
DWORD compr, size;
void *src_colors = (char *)info + info->bmiHeader.biSize;
unsigned int colors;
int bitmap_type = DIB_GetBitmapInfo( &info->bmiHeader, &width, &height, &planes, &bpp, &compr, &size );
if (bitmap_type == -1) return FALSE;
colors = (bpp > 8) ? 0 : 1 << bpp;
if (bitmap_type == 1)
{
dst->bmiHeader = info->bmiHeader;
dst->bmiHeader.biSize = sizeof(dst->bmiHeader);
if (info->bmiHeader.biClrUsed) colors = info->bmiHeader.biClrUsed;
if (info->bmiHeader.biCompression == BI_BITFIELDS)
/* bitfields are always at bmiColors even in larger structures */
memcpy( dst->bmiColors, info->bmiColors, 3 * sizeof(DWORD) );
else if (colors)
{
unsigned int size;
if (coloruse == DIB_PAL_COLORS)
size = colors * sizeof(WORD);
else
size = colors * sizeof(RGBQUAD);
memcpy( dst->bmiColors, src_colors, size );
}
}
else
{
dst->bmiHeader.biSize = sizeof(dst->bmiHeader);
dst->bmiHeader.biWidth = width;
dst->bmiHeader.biHeight = height;
dst->bmiHeader.biPlanes = planes;
dst->bmiHeader.biBitCount = bpp;
dst->bmiHeader.biCompression = compr;
dst->bmiHeader.biSizeImage = size;
dst->bmiHeader.biXPelsPerMeter = 0;
dst->bmiHeader.biYPelsPerMeter = 0;
dst->bmiHeader.biClrUsed = 0;
dst->bmiHeader.biClrImportant = 0;
if (colors)
{
if (coloruse == DIB_PAL_COLORS)
memcpy( dst->bmiColors, src_colors, colors * sizeof(WORD) );
else
{
unsigned int i;
RGBTRIPLE *triple = (RGBTRIPLE *)src_colors;
for (i = 0; i < colors; i++)
{
dst->bmiColors[i].rgbRed = triple[i].rgbtRed;
dst->bmiColors[i].rgbGreen = triple[i].rgbtGreen;
dst->bmiColors[i].rgbBlue = triple[i].rgbtBlue;
dst->bmiColors[i].rgbReserved = 0;
}
}
}
}
return TRUE;
}
/* nulldrv fallback implementation using SetDIBits/StretchBlt */
INT nulldrv_StretchDIBits( PHYSDEV dev, INT xDst, INT yDst, INT widthDst, INT heightDst,
INT xSrc, INT ySrc, INT widthSrc, INT heightSrc, const void *bits,
@ -256,6 +329,8 @@ INT WINAPI SetDIBits( HDC hdc, HBITMAP hbitmap, UINT startscan,
BOOL delete_hdc = FALSE;
PHYSDEV physdev;
BITMAPOBJ *bitmap;
char src_bmibuf[FIELD_OFFSET( BITMAPINFO, bmiColors[256] )];
BITMAPINFO *src_info = (BITMAPINFO *)src_bmibuf;
INT result = 0;
if (coloruse == DIB_RGB_COLORS && !dc)
@ -276,10 +351,14 @@ INT WINAPI SetDIBits( HDC hdc, HBITMAP hbitmap, UINT startscan,
return 0;
}
physdev = GET_DC_PHYSDEV( dc, pSetDIBits );
if (BITMAP_SetOwnerDC( hbitmap, physdev ))
result = physdev->funcs->pSetDIBits( physdev, hbitmap, startscan, lines, bits, info, coloruse );
if (!bitmapinfo_from_user_bitmapinfo( src_info, info, coloruse )) goto done;
physdev = GET_DC_PHYSDEV( dc, pSetDIBits );
if (!BITMAP_SetOwnerDC( hbitmap, physdev )) goto done;
result = physdev->funcs->pSetDIBits( physdev, hbitmap, startscan, lines, bits, src_info, coloruse );
done:
GDI_ReleaseObj( hbitmap );
release_dc_ptr( dc );
if (delete_hdc) DeleteDC(hdc);