/* Copy device parameters back from the target. */
static void
bbox_copy_params(gx_device_bbox * bdev, bool remap_colors)
{
gx_device *tdev = bdev->target;
if (tdev != 0)
gx_device_copy_params((gx_device *)bdev, tdev);
if (remap_colors) {
bdev->black = gx_device_black((gx_device *)bdev);
bdev->white = gx_device_white((gx_device *)bdev);
bdev->transparent =
(bdev->white_is_opaque ? gx_no_color_index : bdev->white);
}
}
/* Initialize a RasterOp source device. */
void
gx_make_rop_texture_device(gx_device_rop_texture * dev, gx_device * target,
gs_logical_operation_t log_op, const gx_device_color * texture)
{
gx_device_init((gx_device *) dev,
(const gx_device *)&gs_rop_texture_device,
NULL, true);
gx_device_set_target((gx_device_forward *)dev, target);
/* Drawing operations are defaulted, non-drawing are forwarded. */
check_device_separable((gx_device *) dev);
gx_device_fill_in_procs((gx_device *) dev);
gx_device_copy_params((gx_device *)dev, target);
dev->log_op = log_op;
dev->texture = *texture;
}
/* Create an alpha compositor. */
static int
c_alpha_create_default_compositor(const gs_composite_t * pcte,
gx_device ** pcdev, gx_device * dev, gs_imager_state * pis,
gs_memory_t * mem)
{
gx_device_composite_alpha *cdev;
if (pacte->params.op == composite_Copy) {
/* Just use the original device. */
*pcdev = dev;
return 0;
}
cdev =
gs_alloc_struct_immovable(mem, gx_device_composite_alpha,
&st_device_composite_alpha,
"create default alpha compositor");
*pcdev = (gx_device *)cdev;
if (cdev == 0)
return_error(gs_error_VMerror);
gx_device_init((gx_device *)cdev,
(const gx_device *)&gs_composite_alpha_device, mem, true);
gx_device_copy_params((gx_device *)cdev, dev);
/*
* Set the color_info and depth to be compatible with the target,
* but using standard chunky color storage, including alpha.
****** CURRENTLY ALWAYS USE 8-BIT COLOR ******
*/
cdev->color_info.depth =
(dev->color_info.num_components == 4 ? 32 /* CMYK, no alpha */ :
(dev->color_info.num_components + 1) * 8);
cdev->color_info.max_gray = cdev->color_info.max_color = 255;
/* No halftoning will occur, but we fill these in anyway.... */
cdev->color_info.dither_grays = cdev->color_info.dither_colors = 256;
/*
* We could speed things up a little by tailoring the procedures in
* the device to the specific num_components, but for simplicity,
* we'll defer considering that until there is a demonstrated need.
*/
gx_device_set_target((gx_device_forward *)cdev, dev);
cdev->params = pacte->params;
return 0;
}
