/***********************************************************************
* GetBitmapBits [GDI32.@]
*
* Copies bitmap bits of bitmap to buffer.
*
* RETURNS
* Success: Number of bytes copied
* Failure: 0
*/
LONG WINAPI GetBitmapBits(
HBITMAP hbitmap, /* [in] Handle to bitmap */
LONG count, /* [in] Number of bytes to copy */
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 );
if (!bmp) return 0;
dst_stride = get_bitmap_stride( bmp->dib.dsBm.bmWidth, bmp->dib.dsBm.bmBitsPixel );
ret = max = dst_stride * bmp->dib.dsBm.bmHeight;
if (!bits) goto done;
if (count > max) count = max;
ret = count;
src.visrect.left = 0;
src.visrect.right = bmp->dib.dsBm.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 (!get_image_from_bitmap( bmp, info, &src_bits, &src ))
{
const char *src_ptr = src_bits.ptr;
int src_stride = get_dib_stride( info->bmiHeader.biWidth, info->bmiHeader.biBitCount );
/* GetBitmapBits returns 16-bit aligned data */
if (info->bmiHeader.biHeight > 0)
{
src_ptr += (info->bmiHeader.biHeight - 1) * src_stride;
src_stride = -src_stride;
}
src_ptr += src.visrect.top * src_stride;
if (src_stride == dst_stride) memcpy( bits, src_ptr, count );
else while (count > 0)
{
memcpy( bits, src_ptr, min( count, dst_stride ) );
src_ptr += src_stride;
bits = (char *)bits + dst_stride;
count -= dst_stride;
}
if (src_bits.free) src_bits.free( &src_bits );
}
else ret = 0;
done:
GDI_ReleaseObj( hbitmap );
return ret;
}
static BOOL copy_bitmap( struct brush_pattern *brush, HBITMAP bitmap )
{
char buffer[FIELD_OFFSET( BITMAPINFO, bmiColors[256])];
BITMAPINFO *info = (BITMAPINFO *)buffer;
struct gdi_image_bits bits;
struct bitblt_coords src;
BITMAPOBJ *bmp = GDI_GetObjPtr( bitmap, OBJ_BITMAP );
if (!bmp) return FALSE;
src.visrect.left = src.x = 0;
src.visrect.top = src.y = 0;
src.visrect.right = src.width = bmp->dib.dsBm.bmWidth;
src.visrect.bottom = src.height = bmp->dib.dsBm.bmHeight;
if (get_image_from_bitmap( bmp, info, &bits, &src )) goto done;
brush->bits = bits;
if (!bits.free)
{
if (!(brush->bits.ptr = HeapAlloc( GetProcessHeap(), 0, info->bmiHeader.biSizeImage ))) goto done;
memcpy( brush->bits.ptr, bits.ptr, info->bmiHeader.biSizeImage );
brush->bits.free = free_heap_bits;
}
if (!(brush->info = HeapAlloc( GetProcessHeap(), 0, get_dib_info_size( info, DIB_RGB_COLORS ))))
{
if (brush->bits.free) brush->bits.free( &brush->bits );
goto done;
}
memcpy( brush->info, info, get_dib_info_size( info, DIB_RGB_COLORS ));
brush->bits.is_copy = FALSE; /* the bits can't be modified */
brush->usage = DIB_RGB_COLORS;
done:
GDI_ReleaseObj( bitmap );
return brush->info != NULL;
}