winemac: Use GetDIBits to retrieve the bitmap header when exporting a bitmap.
Signed-off-by: Ken Thomases <ken@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>
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1837210159
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@ -410,77 +410,28 @@ static int bitmap_info_size(const BITMAPINFO *info, WORD coloruse)
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*
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* Allocates a packed DIB and copies the bitmap data into it.
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*/
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static HGLOBAL create_dib_from_bitmap(HBITMAP hBmp)
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static HGLOBAL create_dib_from_bitmap(HBITMAP bitmap)
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{
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BITMAP bmp;
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HDC hdc;
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HGLOBAL hPackedDIB;
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LPBYTE pPackedDIB;
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LPBITMAPINFOHEADER pbmiHeader;
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unsigned int cDataSize, cPackedSize, OffsetBits;
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int nLinesCopied;
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HANDLE ret = 0;
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BITMAPINFOHEADER header;
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HDC hdc = GetDC(0);
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DWORD header_size;
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BITMAPINFO *bmi;
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if (!GetObjectW(hBmp, sizeof(bmp), &bmp)) return 0;
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memset(&header, 0, sizeof(header));
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header.biSize = sizeof(header);
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if (!GetDIBits(hdc, bitmap, 0, 0, NULL, (BITMAPINFO *)&header, DIB_RGB_COLORS)) goto done;
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/*
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* A packed DIB contains a BITMAPINFO structure followed immediately by
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* an optional color palette and the pixel data.
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*/
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header_size = bitmap_info_size((BITMAPINFO *)&header, DIB_RGB_COLORS);
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if (!(ret = GlobalAlloc(GMEM_FIXED, header_size + header.biSizeImage))) goto done;
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bmi = (BITMAPINFO *)ret;
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memset(bmi, 0, header_size);
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memcpy(bmi, &header, header.biSize);
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GetDIBits(hdc, bitmap, 0, abs(header.biHeight), (char *)bmi + header_size, bmi, DIB_RGB_COLORS);
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/* Calculate the size of the packed DIB */
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cDataSize = abs(bmp.bmHeight) * (((bmp.bmWidth * bmp.bmBitsPixel + 31) / 8) & ~3);
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cPackedSize = sizeof(BITMAPINFOHEADER)
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+ ((bmp.bmBitsPixel <= 8) ? (sizeof(RGBQUAD) * (1 << bmp.bmBitsPixel)) : 0)
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+ cDataSize;
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/* Get the offset to the bits */
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OffsetBits = cPackedSize - cDataSize;
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/* Allocate the packed DIB */
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TRACE("\tAllocating packed DIB of size %d\n", cPackedSize);
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hPackedDIB = GlobalAlloc(GMEM_FIXED, cPackedSize);
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if (!hPackedDIB)
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{
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WARN("Could not allocate packed DIB!\n");
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return 0;
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}
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/* A packed DIB starts with a BITMAPINFOHEADER */
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pPackedDIB = GlobalLock(hPackedDIB);
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pbmiHeader = (LPBITMAPINFOHEADER)pPackedDIB;
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/* Init the BITMAPINFOHEADER */
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pbmiHeader->biSize = sizeof(BITMAPINFOHEADER);
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pbmiHeader->biWidth = bmp.bmWidth;
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pbmiHeader->biHeight = bmp.bmHeight;
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pbmiHeader->biPlanes = 1;
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pbmiHeader->biBitCount = bmp.bmBitsPixel;
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pbmiHeader->biCompression = BI_RGB;
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pbmiHeader->biSizeImage = 0;
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pbmiHeader->biXPelsPerMeter = pbmiHeader->biYPelsPerMeter = 0;
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pbmiHeader->biClrUsed = 0;
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pbmiHeader->biClrImportant = 0;
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/* Retrieve the DIB bits from the bitmap and fill in the
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* DIB color table if present */
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hdc = GetDC(0);
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nLinesCopied = GetDIBits(hdc, /* Handle to device context */
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hBmp, /* Handle to bitmap */
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0, /* First scan line to set in dest bitmap */
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bmp.bmHeight, /* Number of scan lines to copy */
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pPackedDIB + OffsetBits, /* [out] Address of array for bitmap bits */
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(LPBITMAPINFO) pbmiHeader, /* [out] Address of BITMAPINFO structure */
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0); /* RGB or palette index */
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GlobalUnlock(hPackedDIB);
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done:
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ReleaseDC(0, hdc);
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/* Cleanup if GetDIBits failed */
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if (nLinesCopied != bmp.bmHeight)
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{
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TRACE("\tGetDIBits returned %d. Actual lines=%d\n", nLinesCopied, bmp.bmHeight);
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GlobalFree(hPackedDIB);
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hPackedDIB = 0;
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}
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return hPackedDIB;
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return ret;
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}
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