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337 lines
6.7 KiB
C
337 lines
6.7 KiB
C
/*
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* layer.h - Separate graphics operations by layers and replay
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*
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* Written 2016 by Werner Almesberger
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* Copyright 2016 by Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stdlib.h>
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#include <limits.h>
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#include <math.h>
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#include "util.h"
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#include "style.h"
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#include "gfx.h"
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#include "text.h"
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#include "layer.h"
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struct layer_obj {
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enum lo_type {
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lo_line,
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lo_rect,
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lo_poly,
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lo_circ,
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lo_arc,
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lo_text,
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} type;
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int x, y;
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int color, fill_color;
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union {
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struct {
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int ex, ey;
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} line;
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struct {
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int ex, ey;
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} rect;
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struct {
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unsigned n;
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int *vx, *vy;
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} poly;
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struct {
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int r;
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} circ;
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struct {
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int r;
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int sa, ea;
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} arc;
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struct {
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char *s;
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unsigned size;
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enum text_align align;
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int rot;
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} text;
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} u;
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struct layer_obj *next;
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};
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static void bb(struct layer *layer, int x, int y)
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{
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if (layer->xmin > x)
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layer->xmin = x;
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if (layer->ymin > y)
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layer->ymin = y;
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if (layer->xmax < x)
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layer->xmax = x;
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if (layer->ymax < y)
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layer->ymax = y;
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}
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static void bb_rot(struct layer *layer, int x, int y, int rot)
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{
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double a = -rot / 180.0 * M_PI;
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// @@@ figure this out later
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return;
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bb(layer, cos(a) * x + sin(a) * y, cos(a) * y - sin(a) * x);
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}
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static struct layer_obj *new_obj(struct layer *lc, enum lo_type type,
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int color, int fill_color, unsigned layer)
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{
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struct layer_objs **objs;
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struct layer_objs *new_objs;
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struct layer_obj *new_obj;
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for (objs = &lc->objs; *objs; objs = &(*objs)->next) {
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if ((*objs)->layer == layer)
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goto this_layer;
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if ((*objs)->layer < layer)
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break;
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}
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new_objs = alloc_type(struct layer_objs);
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new_objs->layer = layer;
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new_objs->obj = NULL;
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new_objs->next_obj = &new_objs->obj;
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new_objs->next = *objs;
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*objs = new_objs;
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this_layer:
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new_obj = alloc_type(struct layer_obj);
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new_obj->type = type;
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new_obj->color = color;
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new_obj->fill_color = fill_color;
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new_obj->next = NULL;
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*(*objs)->next_obj = new_obj;
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(*objs)->next_obj = &new_obj->next;
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return new_obj;
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}
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void layer_line(void *ctx, int sx, int sy, int ex, int ey,
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int color, unsigned layer)
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{
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struct layer *lc = ctx;
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struct layer_obj *obj = new_obj(ctx, lo_line, color, COLOR_NONE, layer);
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bb(lc, sx, sy);
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bb(lc, ex, ey);
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obj->x = sx;
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obj->y = sy;
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obj->u.line.ex = ex;
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obj->u.line.ey = ey;
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}
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void layer_rect(void *ctx, int sx, int sy, int ex, int ey,
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int color, int fill_color, unsigned layer)
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{
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struct layer *lc = ctx;
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struct layer_obj *obj = new_obj(ctx, lo_rect, color, fill_color, layer);
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bb(lc, sx, sy);
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bb(lc, ex, ey);
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obj->x = sx;
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obj->y = sy;
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obj->u.rect.ex = ex;
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obj->u.rect.ey = ey;
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}
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void layer_poly(void *ctx,
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int points, const int x[points], const int y[points],
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int color, int fill_color, unsigned layer)
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{
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struct layer *lc = ctx;
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struct layer_obj *obj = new_obj(ctx, lo_poly, color, fill_color, layer);
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int i;
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unsigned size;
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for (i = 0; i != points; i++)
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bb(lc, x[i], y[i]);
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obj->u.poly.n = points;
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size = sizeof(int) * points;
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obj->u.poly.vx = alloc_size(size);
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obj->u.poly.vy = alloc_size(size);
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memcpy(obj->u.poly.vx, x, size);
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memcpy(obj->u.poly.vy, y, size);
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}
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void layer_circ(void *ctx, int x, int y, int r,
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int color, int fill_color, unsigned layer)
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{
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struct layer *lc = ctx;
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struct layer_obj *obj = new_obj(ctx, lo_circ, color, fill_color, layer);
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bb(lc, x - r, y - r);
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bb(lc, x + r, y + r);
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obj->x = x;
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obj->y = y;
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obj->u.circ.r = r;
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}
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void layer_arc(void *ctx, int x, int y, int r, int sa, int ea,
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int color, int fill_color, unsigned layer)
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{
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struct layer *lc = ctx;
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struct layer_obj *obj = new_obj(ctx, lo_arc, color, fill_color, layer);
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bb(lc, x - r, y - r);
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bb(lc, x + r, y + r);
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obj->x = x;
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obj->y = y;
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obj->u.arc.r = r;
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obj->u.arc.sa = sa;
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obj->u.arc.ea = ea;
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}
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void layer_text(void *ctx, int x, int y, const char *s, unsigned size,
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enum text_align align, int rot, unsigned color, unsigned layer)
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{
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struct layer *lc = ctx;
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struct layer_obj *obj = new_obj(ctx, lo_text, color, COLOR_NONE, layer);
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unsigned width = lc->ops->text_width(lc->user, s, size);
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bb_rot(lc, x, y - size, rot);
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bb_rot(lc, x + width, y, rot);
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obj->x = x;
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obj->y = y;
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obj->u.text.s = stralloc(s);
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obj->u.text.size = size;
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obj->u.text.align = align;
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obj->u.text.rot = rot;
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}
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void layer_init(struct layer *layer, const struct gfx_ops *ops, void *user)
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{
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layer->ops = ops;
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layer->user = user;
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layer->xmin = layer->ymin = INT_MAX;
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layer->xmax = layer->ymax = INT_MIN;
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layer->objs = NULL;
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}
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void layer_wipe(struct layer *layer)
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{
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layer->objs = NULL;
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}
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void layer_replay(const struct layer *layer)
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{
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const struct gfx_ops *ops = layer->ops;
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void *ctx = layer->user;
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const struct layer_objs *objs;
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const struct layer_obj *obj;
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for (objs = layer->objs; objs; objs = objs->next)
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for (obj = objs->obj; obj; obj = obj->next)
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switch (obj->type) {
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case lo_line:
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ops->line(ctx, obj->x, obj->y,
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obj->u.line.ex, obj->u.line.ey,
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obj->color, objs->layer);
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break;
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case lo_rect:
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ops->rect(ctx, obj->x, obj->y,
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obj->u.rect.ex, obj->u.rect.ey,
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obj->color, obj->fill_color, objs->layer);
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break;
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case lo_poly:
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ops->poly(ctx, obj->u.poly.n,
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obj->u.poly.vx, obj->u.poly.vy,
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obj->color, obj->fill_color, objs->layer);
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break;
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case lo_circ:
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ops->circ(ctx, obj->x, obj->y,
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obj->u.circ.r,
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obj->color, obj->fill_color, objs->layer);
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break;
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case lo_arc:
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ops->arc(ctx, obj->x, obj->y, obj->u.arc.r,
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obj->u.arc.sa, obj->u.arc.ea,
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obj->color, obj->fill_color, objs->layer);
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break;
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case lo_text:
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ops->text(ctx, obj->x, obj->y, obj->u.text.s,
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obj->u.text.size, obj->u.text.align,
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obj->u.text.rot,
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obj->color, objs->layer);
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break;
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default:
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abort();
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}
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}
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void layer_bbox(const struct layer *layer, int *x, int *y, int *w, int *h)
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{
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if (x)
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*x = layer->xmin;
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if (y)
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*y = layer->ymin;
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if (w)
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*w = layer->xmax - layer->xmin + 1;
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if (h)
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*h = layer->ymax - layer->ymin + 1;
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}
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static void layer_obj_destroy(struct layer_obj *obj)
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{
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switch (obj->type) {
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case lo_poly:
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free(obj->u.poly.vx);
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free(obj->u.poly.vy);
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break;
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case lo_text:
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free(obj->u.text.s);
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break;
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default:
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break;
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}
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free(obj);
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}
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void layer_destroy(struct layer *layer)
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{
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struct layer_objs *next_objs;
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struct layer_obj *next_obj;
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while (layer->objs) {
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next_objs = layer->objs->next;
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while (layer->objs->obj) {
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next_obj = layer->objs->obj->next;
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layer_obj_destroy(layer->objs->obj);
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layer->objs->obj = next_obj;
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}
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free(layer->objs);
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layer->objs = next_objs;
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}
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}
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