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gdi32: Reimplement GetBitmapBits using the GetImage driver function.

This commit is contained in:
Alexandre Julliard 2011-07-25 15:31:46 +02:00
parent d33e0d2c86
commit 1724c73534
1 changed files with 39 additions and 64 deletions
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103
dlls/gdi32/bitmap.c
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@ -382,83 +382,58 @@ LONG WINAPI GetBitmapBits(
LONG count, /* [in] Number of bytes to copy */ LONG count, /* [in] Number of bytes to copy */
LPVOID bits) /* [out] Pointer to buffer to receive bits */ LPVOID bits) /* [out] Pointer to buffer to receive bits */
{ {
char buffer[FIELD_OFFSET( BITMAPINFO, bmiColors[256] )];
BITMAPINFO *info = (BITMAPINFO *)buffer;
struct gdi_image_bits src_bits;
struct bitblt_coords src;
int dst_stride, max, ret;
BITMAPOBJ *bmp = GDI_GetObjPtr( hbitmap, OBJ_BITMAP ); BITMAPOBJ *bmp = GDI_GetObjPtr( hbitmap, OBJ_BITMAP );
LONG height, ret;
if (!bmp) return 0; if (!bmp) return 0;
if (bmp->dib) /* simply copy the bits from the DIB */ if (bmp->dib) dst_stride = get_bitmap_stride( bmp->dib->dsBmih.biWidth, bmp->dib->dsBmih.biBitCount );
else dst_stride = get_bitmap_stride( bmp->bitmap.bmWidth, bmp->bitmap.bmBitsPixel );
ret = max = dst_stride * bmp->bitmap.bmHeight;
if (!bits) goto done;
if (count > max) count = max;
ret = count;
src.visrect.left = 0;
src.visrect.right = bmp->bitmap.bmWidth;
src.visrect.top = 0;
src.visrect.bottom = (count + dst_stride - 1) / dst_stride;
src.x = src.y = 0;
src.width = src.visrect.right - src.visrect.left;
src.height = src.visrect.bottom - src.visrect.top;
if (!bmp->funcs->pGetImage( NULL, hbitmap, info, &src_bits, &src ))
{ {
DIBSECTION *dib = bmp->dib; const char *src_ptr = src_bits.ptr;
const char *src = dib->dsBm.bmBits; int src_stride = get_dib_stride( info->bmiHeader.biWidth, info->bmiHeader.biBitCount );
INT width_bytes = get_bitmap_stride(dib->dsBm.bmWidth, dib->dsBm.bmBitsPixel);
LONG max = width_bytes * bmp->bitmap.bmHeight;
if (!bits) /* GetBitmapBits returns 16-bit aligned data */
if (info->bmiHeader.biHeight > 0)
{ {
ret = max; src_ptr += (info->bmiHeader.biHeight - 1) * src_stride;
goto done; src_stride = -src_stride;
} }
src_ptr += src.visrect.top * src_stride;
if (count > max) count = max; if (src_stride == dst_stride) memcpy( bits, src_ptr, count );
ret = count; else while (count > 0)
/* GetBitmapBits returns not 32-bit aligned data */
if (bmp->dib->dsBmih.biHeight >= 0) /* not top-down, need to flip contents vertically */
{ {
src += dib->dsBm.bmWidthBytes * dib->dsBm.bmHeight; memcpy( bits, src_ptr, min( count, dst_stride ) );
while (count > 0) src_ptr += src_stride;
{ bits = (char *)bits + dst_stride;
src -= dib->dsBm.bmWidthBytes; count -= dst_stride;
memcpy( bits, src, min( count, width_bytes ) );
bits = (char *)bits + width_bytes;
count -= width_bytes;
}
} }
else if (src_bits.free) src_bits.free( &src_bits );
{
while (count > 0)
{
memcpy( bits, src, min( count, width_bytes ) );
src += dib->dsBm.bmWidthBytes;
bits = (char *)bits + width_bytes;
count -= width_bytes;
}
}
goto done;
} }
else ret = 0;
/* If the bits vector is null, the function should return the read size */ done:
if(bits == NULL)
{
ret = bmp->bitmap.bmWidthBytes * bmp->bitmap.bmHeight;
goto done;
}
if (count < 0) {
WARN("(%d): Negative number of bytes passed???\n", count );
count = -count;
}
/* Only get entire lines */
height = count / bmp->bitmap.bmWidthBytes;
if (height > bmp->bitmap.bmHeight) height = bmp->bitmap.bmHeight;
count = height * bmp->bitmap.bmWidthBytes;
if (count == 0)
{
WARN("Less than one entire line requested\n");
ret = 0;
goto done;
}
TRACE("(%p, %d, %p) %dx%d %d colors fetched height: %d\n",
hbitmap, count, bits, bmp->bitmap.bmWidth, bmp->bitmap.bmHeight,
1 << bmp->bitmap.bmBitsPixel, height );
ret = bmp->funcs->pGetBitmapBits( hbitmap, bits, count );
done:
GDI_ReleaseObj( hbitmap ); GDI_ReleaseObj( hbitmap );
return ret; return ret;
} }