C++ (Cpp) gs_make_mem_abuf_device示例

示例#1

文件： gspaint.c 项目： computersforpeace/ghostpdl

static int
alpha_buffer_init(gs_state * pgs, fixed extra_x, fixed extra_y, int alpha_bits, 
                  bool devn)
{
    gx_device *dev = gs_currentdevice_inline(pgs);
    int log2_alpha_bits = ilog2(alpha_bits);
    gs_fixed_rect bbox;
    gs_int_rect ibox;
    uint width, raster, band_space;
    uint height;
    gs_log2_scale_point log2_scale;
    gs_memory_t *mem;
    gx_device_memory *mdev;

    log2_scale.x = log2_scale.y = log2_alpha_bits;
    gx_path_bbox(pgs->path, &bbox);
    ibox.p.x = fixed2int(bbox.p.x - extra_x) - 1;
    ibox.p.y = fixed2int(bbox.p.y - extra_y) - 1;
    ibox.q.x = fixed2int_ceiling(bbox.q.x + extra_x) + 1;
    ibox.q.y = fixed2int_ceiling(bbox.q.y + extra_y) + 1;
    width = (ibox.q.x - ibox.p.x) << log2_scale.x;
    raster = bitmap_raster(width);
    band_space = raster << log2_scale.y;
    height = (abuf_nominal / band_space) << log2_scale.y;
    if (height == 0)
        height = 1 << log2_scale.y;
    mem = pgs->memory;
    mdev = gs_alloc_struct(mem, gx_device_memory, &st_device_memory,
                           "alpha_buffer_init");
    if (mdev == 0)
        return 0;		/* if no room, don't buffer */
    /* We may have to update the marking parameters if we have a pdf14 device
       as our target.  Need to do while dev is still active in pgs */
    if (dev_proc(dev, dev_spec_op)(dev, gxdso_is_pdf14_device, NULL, 0) > 0) {
        gs_update_trans_marking_params(pgs);
    }
    gs_make_mem_abuf_device(mdev, mem, dev, &log2_scale,
                            alpha_bits, ibox.p.x << log2_scale.x, devn);
    mdev->width = width;
    mdev->height = height;
    mdev->bitmap_memory = mem;
    if ((*dev_proc(mdev, open_device)) ((gx_device *) mdev) < 0) {
        /* No room for bits, punt. */
        gs_free_object(mem, mdev, "alpha_buffer_init");
        return 0;
    }
    gx_set_device_only(pgs, (gx_device *) mdev);
    scale_paths(pgs, log2_scale.x, log2_scale.y, true);
    return 1;
}

示例#2

文件： gspaint.c 项目： MasterPlexus/vendor_goldenve

static int
alpha_buffer_init(gs_state * pgs, fixed extra_x, fixed extra_y, int alpha_bits)
{
    gx_device *dev = gs_currentdevice_inline(pgs);
    int log2_alpha_bits = ilog2(alpha_bits);
    gs_fixed_rect bbox;
    gs_int_rect ibox;
    uint width, raster, band_space;
    uint height;
    gs_log2_scale_point log2_scale;
    gs_memory_t *mem;
    gx_device_memory *mdev;

    log2_scale.x = log2_scale.y = log2_alpha_bits;
    gx_path_bbox(pgs->path, &bbox);
    ibox.p.x = fixed2int(bbox.p.x - extra_x) - 1;
    ibox.p.y = fixed2int(bbox.p.y - extra_y) - 1;
    ibox.q.x = fixed2int_ceiling(bbox.q.x + extra_x) + 1;
    ibox.q.y = fixed2int_ceiling(bbox.q.y + extra_y) + 1;
    width = (ibox.q.x - ibox.p.x) << log2_scale.x;
    raster = bitmap_raster(width);
    band_space = raster << log2_scale.y;
    height = (abuf_nominal / band_space) << log2_scale.y;
    if (height == 0)
	height = 1 << log2_scale.y;
    mem = pgs->memory;
    mdev = gs_alloc_struct(mem, gx_device_memory, &st_device_memory,
			   "alpha_buffer_init");
    if (mdev == 0)
	return 0;		/* if no room, don't buffer */
    gs_make_mem_abuf_device(mdev, mem, dev, &log2_scale,
			    alpha_bits, ibox.p.x << log2_scale.x);
    mdev->width = width;
    mdev->height = height;
    mdev->bitmap_memory = mem;
    if ((*dev_proc(mdev, open_device)) ((gx_device *) mdev) < 0) {
	/* No room for bits, punt. */
	gs_free_object(mem, mdev, "alpha_buffer_init");
	return 0;
    }
    gx_set_device_only(pgs, (gx_device *) mdev);
    scale_paths(pgs, log2_scale.x, log2_scale.y, true);
    return 1;
}