AKTIVE: grey.tcl at trunk

File etc/generator/virtual/grey.tcl artifact ad7789bb22 on branch trunk

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## -*- mode: tcl ; fill-column: 90 -*-
# # ## ### ##### ######## ############# #####################
## Generators -- Virtual Image - Left to right gradient, black to white

operator image::grey {
    section generator virtual

    note Returns image containing a left to right black to white gradient.

    example {width 256 height 32}

    uint   width   Width of the returned image
    uint   height  Height of the returned image

    state -fields {
	double w;
    } -setup {
	aktive_geometry_set (domain, 0, 0, param->width, param->height, 1);

	double w = param->width - 1;
	if (w == 0) w = 1;

	state->w = w;
    }

    blit gradient {
	{AH {y AY 1 up} {y SY 1 up}}
	{AW {x AX 1 up} {x SX 1 up}}
	{DD {z  0 1 up} {z  0 1 up}}
    } {point {
	((double) x) / istate->w
    }}

    pixels {
	#define SD (idomain->depth)
	#define SH (idomain->height)
	#define SW (idomain->width)
	#define SX (request->x)
	#define SY (request->y)
	@@gradient@@
    }
}

##
# # ## ### ##### ######## ############# #####################
::return