§ 13.9 - plugin_demo.c

// plugin_demo.c
// -------------
// tab stops every 4 columns

#include <math.h>
#include <string.h>
#include "developer.h"

void pengine(struct plug *p,long start,long finish,struct pkg *(*service)(struct req *p))   // sets 64K remap
{
long i,v,b;

    b = (p->f[0] - 100.0f) * 655.35f;   // b is now [-65535...65535]
    for (i = start; i < finish; i++)    // we set this range to [0...65536]
    {
        v = i + b;                  // temp brightness adjust;
        if (v < 0) v = 0;           // now limit remap range...
        if (v > 65535) v = 65535;   // ...to acceptable bounds
        p->lr[i] = v;               // install in remap channel
    }
}

void dengine(struct plug *p,long start,long finish,struct pkg *(*service)(struct req *p))   // generates output
{
long i;

    for (i = start; i < finish; i++) // 1-dimensional pixel processing
    {
        p->sr[i] = p->lr[p->mr[i]]; // remap pixel brightness
        p->sg[i] = p->lr[p->mg[i]]; // ...using 64k table in layer
        p->sb[i] = p->lr[p->mb[i]]; // ...
    }
}

void setup(struct plugin *p)    // NOTE: most struct elements are preset to 0,
{                               // if that is the setting you need, it's there.
#include "ak_pu_date.txt"               // this inserts the current date in the plugin

    p->layer_pri    = 9500;             // layer priority (posit in fx stack - see developer.h)
    strcpy(p->panel.n,"Brightness");    // name appearing on panel
    p->pthread[0]   = 1;                // plugin desires pengine() threading
    p->prange_methods[0]= 2;            // custom range for pengine()
    p->pfinish[0]   = 65536;            // end+1 range for pengine() to process
    p->dthread[0]   = 1;                // plugin desires dengine() threading
    p->promotable   = 1;                // BUT user can add alpha, paint
    p->req_lr       = 65536;            // we'd like 1 layer of this size in lr
    p->slider_req   = 1;                // we'd like 1 slider (#0)
    strcpy(p->sliders[0].n,"Intensity");// legend for slider
    p->forder[0]    = 20;               // position on line zero
    p->svalues[0]   = 100.0f;           // initial value
    p->zvalues[0]   = 200.0f;           // initial hi value (user settable)
    p->ticks[0] = 21;                   // Ten ticks per hundred
}                                       // (low values default to 0.0f)

void init(struct plug *pl,struct pkg *(*service)(struct req *p)) // called before pengine() and dengine()
{
struct req r;
struct pkg *p;
char *msg = "demo plugin init";
    // the following just demonstrates using the service function
    r.svc = REQ_STATUS;     // request status line message service
    r.p1 = msg;             // set up request with proper parameter
    p = service(&r);        // send msg to status line, get package back
}

void cleanup(struct plug *pl,struct pkg *(*service)(struct req *p)) // called after all pengine() and dengine threads complete
{
struct req r;
struct pkg *p;
char *msg = "demo plugin cleanup";
    // the following just demonstrates using the service function
    r.svc = REQ_STATUS;     // request status line message service
    r.p1 = msg;             // set up request with proper parameter
    p = service(&r);        // send msg to status line, get package back
}

 

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