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eeshow/diff.c (diff_to_canvas): draw pixel differences to canvas (WIP)

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Offsets still aren't right.
This commit is contained in:
Werner Almesberger 2016-08-09 10:14:36 -03:00
parent bcec5c005f
commit e59fff3363
2 changed files with 85 additions and 0 deletions
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78
eeshow/diff.c
View File

@ -17,12 +17,15 @@
#include <stdio.h>
#include <unistd.h>
#include <cairo/cairo.h>
#include "util.h"
#include "main.h"
#include "cro.h"
#include "file.h"
#include "sch.h"
#include "lib.h"
#include "record.h"
#include "diff.h"
@ -278,6 +281,81 @@ static void diff_end(void *ctx)
}
/* ----- Diff to canvas ---------------------------------------------------- */
static void merge_coord(int pos_a, int pos_b, int dim_a, int dim_b,
int *pos_res, int *res_dim)
{
if (pos_a < pos_b) {
*pos_res = pos_a;
dim_b += pos_b - pos_a;
} else {
*pos_res = pos_a;
dim_a += pos_a - pos_b;
}
*res_dim = dim_a > dim_b ? dim_a : dim_b;
}
void diff_to_canvas(cairo_t *cr, int cx, int cy, float scale,
struct cro_ctx *old, struct cro_ctx *new)
{
int old_xmin, old_ymin, old_w, old_h;
int new_xmin, new_ymin, new_w, new_h;
int xmin, ymin, w, h, stride;
uint32_t *img_old, *img_new;
double x1, y1, x2, y2;
int sw, sh;
cairo_t *old_cr;
cairo_surface_t *s;
cairo_clip_extents(cr, &x1, &y1, &x2, &y2);
sw = x2 - x1;
sh = y2 - y1;
/* @@@ baeh ! */
record_bbox((const struct record *) old,
&old_xmin, &old_ymin, &old_w, &old_h);
record_bbox((const struct record *) new,
&new_xmin, &new_ymin, &new_w, &new_h);
merge_coord(old_xmin, new_xmin, old_w, new_w, &xmin, &w);
merge_coord(old_ymin, new_ymin, old_h, new_h, &ymin, &h);
img_old = cro_img(old,
-scale * cx + sw / 2.0 - (xmin - old_xmin) * scale,
-scale * cy + sh / 2.0 - (ymin - old_ymin) * scale,
sw, sh, scale, &old_cr, &stride);
img_new = cro_img(new,
-scale * cx + sw / 2.0 - (xmin - new_xmin) * scale,
-scale * cy + sh / 2.0 - (ymin - new_ymin) * scale,
sw, sh, scale, NULL, NULL);
struct diff diff = {
.w = sw,
.h = sh,
.stride = stride,
.frame_radius = DEFAULT_FRAME_RADIUS,
.areas = NULL,
};
s = cairo_get_target(old_cr);
cairo_surface_flush(s);
differences(&diff, img_old, img_new);
show_areas(&diff, img_old);
cairo_surface_mark_dirty(s);
cairo_set_source_surface(cr, s, 0, 0);
cairo_paint(cr);
cairo_surface_destroy(s);
cairo_destroy(old_cr);
free(img_old);
free(img_new);
}
/* ----- Operations -------------------------------------------------------- */

7
eeshow/diff.h
View File

@ -14,9 +14,16 @@
#ifndef DIFF_H
#define DIFF_H
#include <cairo/cairo.h>
#include "gfx.h"
#include "cro.h"
extern const struct gfx_ops diff_ops;
void diff_to_canvas(cairo_t *cr, int cx, int cy, float scale,
struct cro_ctx *old, struct cro_ctx *new);
#endif /* !DIFF_H */