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gdi32: Simplify the CreateCompatibleBitmap implementation.

This commit is contained in:
Alexandre Julliard 2012-01-10 21:28:19 +01:00
parent 765fca3417
commit 9ecc1e0702
1 changed files with 23 additions and 67 deletions
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90
dlls/gdi32/bitmap.c
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@ -135,78 +135,34 @@ HBITMAP WINAPI CreateBitmap( INT width, INT height, UINT planes,
*/ */
HBITMAP WINAPI CreateCompatibleBitmap( HDC hdc, INT width, INT height) HBITMAP WINAPI CreateCompatibleBitmap( HDC hdc, INT width, INT height)
{ {
HBITMAP hbmpRet = 0; char buffer[FIELD_OFFSET( BITMAPINFO, bmiColors[256] )];
BITMAPINFO *bi = (BITMAPINFO *)buffer;
DIBSECTION dib;
TRACE("(%p,%d,%d) =\n", hdc, width, height); TRACE("(%p,%d,%d)\n", hdc, width, height);
if (GetObjectType( hdc ) != OBJ_MEMDC) if (GetObjectType( hdc ) != OBJ_MEMDC)
return CreateBitmap( width, height,
GetDeviceCaps(hdc, PLANES), GetDeviceCaps(hdc, BITSPIXEL), NULL );
switch (GetObjectW( GetCurrentObject( hdc, OBJ_BITMAP ), sizeof(dib), &dib ))
{ {
hbmpRet = CreateBitmap(width, height, case sizeof(BITMAP): /* A device-dependent bitmap is selected in the DC */
GetDeviceCaps(hdc, PLANES), return CreateBitmap( width, height, dib.dsBm.bmPlanes, dib.dsBm.bmBitsPixel, NULL );
GetDeviceCaps(hdc, BITSPIXEL),
NULL); case sizeof(DIBSECTION): /* A DIB section is selected in the DC */
bi->bmiHeader = dib.dsBmih;
bi->bmiHeader.biWidth = width;
bi->bmiHeader.biHeight = height;
if (dib.dsBmih.biCompression == BI_BITFIELDS) /* copy the color masks */
memcpy(bi->bmiColors, dib.dsBitfields, sizeof(dib.dsBitfields));
else if (dib.dsBmih.biBitCount <= 8) /* copy the color table */
GetDIBColorTable(hdc, 0, 256, bi->bmiColors);
return CreateDIBSection( hdc, bi, DIB_RGB_COLORS, NULL, NULL, 0 );
default:
return 0;
} }
else /* Memory DC */
{
DIBSECTION dib;
HBITMAP bitmap = GetCurrentObject( hdc, OBJ_BITMAP );
INT size = GetObjectW( bitmap, sizeof(dib), &dib );
if (!size) return 0;
if (size == sizeof(BITMAP))
{
/* A device-dependent bitmap is selected in the DC */
hbmpRet = CreateBitmap(width, height,
dib.dsBm.bmPlanes,
dib.dsBm.bmBitsPixel,
NULL);
}
else
{
/* A DIB section is selected in the DC */
BITMAPINFO *bi;
void *bits;
/* Allocate memory for a BITMAPINFOHEADER structure and a
color table. The maximum number of colors in a color table
is 256 which corresponds to a bitmap with depth 8.
Bitmaps with higher depths don't have color tables. */
bi = HeapAlloc(GetProcessHeap(), 0, sizeof(BITMAPINFOHEADER) + 256 * sizeof(RGBQUAD));
if (bi)
{
bi->bmiHeader.biSize = sizeof(bi->bmiHeader);
bi->bmiHeader.biWidth = width;
bi->bmiHeader.biHeight = height;
bi->bmiHeader.biPlanes = dib.dsBmih.biPlanes;
bi->bmiHeader.biBitCount = dib.dsBmih.biBitCount;
bi->bmiHeader.biCompression = dib.dsBmih.biCompression;
bi->bmiHeader.biSizeImage = 0;
bi->bmiHeader.biXPelsPerMeter = dib.dsBmih.biXPelsPerMeter;
bi->bmiHeader.biYPelsPerMeter = dib.dsBmih.biYPelsPerMeter;
bi->bmiHeader.biClrUsed = dib.dsBmih.biClrUsed;
bi->bmiHeader.biClrImportant = dib.dsBmih.biClrImportant;
if (bi->bmiHeader.biCompression == BI_BITFIELDS)
{
/* Copy the color masks */
CopyMemory(bi->bmiColors, dib.dsBitfields, 3 * sizeof(DWORD));
}
else if (bi->bmiHeader.biBitCount <= 8)
{
/* Copy the color table */
GetDIBColorTable(hdc, 0, 256, bi->bmiColors);
}
hbmpRet = CreateDIBSection(hdc, bi, DIB_RGB_COLORS, &bits, NULL, 0);
HeapFree(GetProcessHeap(), 0, bi);
}
}
}
TRACE("\t\t%p\n", hbmpRet);
return hbmpRet;
} }