C++ (Cpp) get_image_from_bitmap Examples

Example #1

File: bitmap.c Project: MortenRoenne/wine

/***********************************************************************
 * 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;
}

Example #2

File: brush.c Project: AlexSteel/wine

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;
}