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CreateDIBitmap creates a monochrome bitmap only when the first color of the 

colormap is black followed by white. Otherwise it creates a color bitmap.
This commit is contained in:
Francois Boisvert 1999-09-23 11:40:38 +00:00 committed by Alexandre Julliard
parent 5a3505c985
commit 3d696d93de
1 changed files with 11 additions and 5 deletions
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16
objects/dib.c
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@ -800,7 +800,7 @@ HBITMAP WINAPI CreateDIBitmap( HDC hdc, const BITMAPINFOHEADER *header,
/* Check if we should create a monochrome or color bitmap. */
/* We create a monochrome bitmap only if it has exactly 2 */
/* colors, which are either black or white, nothing else. */
/* colors, which are black followed by white, nothing else. */
/* In all other cases, we create a color bitmap. */
if (bpp != 1) fColor = TRUE;
@ -812,23 +812,29 @@ HBITMAP WINAPI CreateDIBitmap( HDC hdc, const BITMAPINFOHEADER *header,
{
RGBQUAD *rgb = data->bmiColors;
DWORD col = RGB( rgb->rgbRed, rgb->rgbGreen, rgb->rgbBlue );
if ((col == RGB(0,0,0)) || (col == RGB(0xff,0xff,0xff)))
/* Check if the first color of the colormap is black */
if ((col == RGB(0,0,0)))
{
rgb++;
col = RGB( rgb->rgbRed, rgb->rgbGreen, rgb->rgbBlue );
fColor = ((col != RGB(0,0,0)) && (col != RGB(0xff,0xff,0xff)));
/* If the second color is white, create a monochrome bitmap */
fColor = (col != RGB(0xff,0xff,0xff));
}
/* Note : If the first color of the colormap is white
followed by black, we have to create a color bitmap.
If we don't the white will be displayed in black later on!*/
else fColor = TRUE;
}
else if (data->bmiHeader.biSize == sizeof(BITMAPCOREHEADER))
{
RGBTRIPLE *rgb = ((BITMAPCOREINFO *)data)->bmciColors;
DWORD col = RGB( rgb->rgbtRed, rgb->rgbtGreen, rgb->rgbtBlue );
if ((col == RGB(0,0,0)) || (col == RGB(0xff,0xff,0xff)))
if ((col == RGB(0,0,0)))
{
rgb++;
col = RGB( rgb->rgbtRed, rgb->rgbtGreen, rgb->rgbtBlue );
fColor = ((col != RGB(0,0,0)) && (col != RGB(0xff,0xff,0xff)));
fColor = (col != RGB(0xff,0xff,0xff));
}
else fColor = TRUE;
}