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#include <assert.h>
#include "fitz.h"
fz_path *
fz_new_path(fz_context *ctx)
{
fz_path *path;
path = fz_malloc_struct(ctx, fz_path);
path->len = 0;
path->cap = 0;
path->items = NULL;
return path;
}
fz_path *
fz_clone_path(fz_context *ctx, fz_path *old)
{
fz_path *path;
assert(old);
path = fz_malloc_struct(ctx, fz_path);
fz_try(ctx)
{
path->len = old->len;
path->cap = old->len;
path->items = fz_malloc_array(ctx, path->cap, sizeof(fz_path_item));
memcpy(path->items, old->items, sizeof(fz_path_item) * path->len);
}
fz_catch(ctx)
{
fz_free(ctx, path);
fz_rethrow(ctx);
}
return path;
}
void
fz_free_path(fz_context *ctx, fz_path *path)
{
if (path == NULL)
return;
fz_free(ctx, path->items);
fz_free(ctx, path);
}
static void
grow_path(fz_context *ctx, fz_path *path, int n)
{
int newcap = path->cap;
if (path->len + n <= path->cap)
return;
while (path->len + n > newcap)
newcap = newcap + 36;
path->items = fz_resize_array(ctx, path->items, newcap, sizeof(fz_path_item));
path->cap = newcap;
}
void
fz_moveto(fz_context *ctx, fz_path *path, float x, float y)
{
grow_path(ctx, path, 3);
path->items[path->len++].k = FZ_MOVETO;
path->items[path->len++].v = x;
path->items[path->len++].v = y;
}
void
fz_lineto(fz_context *ctx, fz_path *path, float x, float y)
{
if (path->len == 0)
{
fz_warn(ctx, "lineto with no current point");
return;
}
grow_path(ctx, path, 3);
path->items[path->len++].k = FZ_LINETO;
path->items[path->len++].v = x;
path->items[path->len++].v = y;
}
void
fz_curveto(fz_context *ctx, fz_path *path,
float x1, float y1,
float x2, float y2,
float x3, float y3)
{
if (path->len == 0)
{
fz_warn(ctx, "curveto with no current point");
return;
}
grow_path(ctx, path, 7);
path->items[path->len++].k = FZ_CURVETO;
path->items[path->len++].v = x1;
path->items[path->len++].v = y1;
path->items[path->len++].v = x2;
path->items[path->len++].v = y2;
path->items[path->len++].v = x3;
path->items[path->len++].v = y3;
}
void
fz_curvetov(fz_context *ctx, fz_path *path, float x2, float y2, float x3, float y3)
{
float x1, y1;
if (path->len == 0)
{
fz_warn(ctx, "curvetov with no current point");
return;
}
x1 = path->items[path->len-2].v;
y1 = path->items[path->len-1].v;
fz_curveto(ctx, path, x1, y1, x2, y2, x3, y3);
}
void
fz_curvetoy(fz_context *ctx, fz_path *path, float x1, float y1, float x3, float y3)
{
fz_curveto(ctx, path, x1, y1, x3, y3, x3, y3);
}
void
fz_closepath(fz_context *ctx, fz_path *path)
{
if (path->len == 0)
{
fz_warn(ctx, "closepath with no current point");
return;
}
grow_path(ctx, path, 1);
path->items[path->len++].k = FZ_CLOSE_PATH;
}
static inline fz_rect bound_expand(fz_rect r, fz_point p)
{
if (p.x < r.x0) r.x0 = p.x;
if (p.y < r.y0) r.y0 = p.y;
if (p.x > r.x1) r.x1 = p.x;
if (p.y > r.y1) r.y1 = p.y;
return r;
}
fz_rect
fz_bound_path(fz_path *path, fz_stroke_state *stroke, fz_matrix ctm)
{
fz_point p;
fz_rect r;
int i = 0;
/* If the path is empty, return the empty rectangle here - don't wait
* for it to be expanded in the stroked case below. */
if (path->len == 0)
return fz_empty_rect;
p.x = path->items[1].v;
p.y = path->items[2].v;
p = fz_transform_point(ctm, p);
r.x0 = r.x1 = p.x;
r.y0 = r.y1 = p.y;
while (i < path->len)
{
switch (path->items[i++].k)
{
case FZ_CURVETO:
p.x = path->items[i++].v;
p.y = path->items[i++].v;
r = bound_expand(r, fz_transform_point(ctm, p));
p.x = path->items[i++].v;
p.y = path->items[i++].v;
r = bound_expand(r, fz_transform_point(ctm, p));
p.x = path->items[i++].v;
p.y = path->items[i++].v;
r = bound_expand(r, fz_transform_point(ctm, p));
break;
case FZ_MOVETO:
case FZ_LINETO:
p.x = path->items[i++].v;
p.y = path->items[i++].v;
r = bound_expand(r, fz_transform_point(ctm, p));
break;
case FZ_CLOSE_PATH:
break;
}
}
if (stroke)
{
float expand = stroke->linewidth;
if (expand == 0)
expand = 1.0f;
expand *= fz_matrix_max_expansion(ctm);
expand *= stroke->miterlimit;
r.x0 -= expand;
r.y0 -= expand;
r.x1 += expand;
r.y1 += expand;
}
return r;
}
void
fz_transform_path(fz_path *path, fz_matrix ctm)
{
fz_point p;
int k, i = 0;
while (i < path->len)
{
switch (path->items[i++].k)
{
case FZ_CURVETO:
for (k = 0; k < 3; k++)
{
p.x = path->items[i].v;
p.y = path->items[i+1].v;
p = fz_transform_point(ctm, p);
path->items[i].v = p.x;
path->items[i+1].v = p.y;
i += 2;
}
break;
case FZ_MOVETO:
case FZ_LINETO:
p.x = path->items[i].v;
p.y = path->items[i+1].v;
p = fz_transform_point(ctm, p);
path->items[i].v = p.x;
path->items[i+1].v = p.y;
i += 2;
break;
case FZ_CLOSE_PATH:
break;
}
}
}
void
fz_debug_path(fz_path *path, int indent)
{
float x, y;
int i = 0;
int n;
while (i < path->len)
{
for (n = 0; n < indent; n++)
putchar(' ');
switch (path->items[i++].k)
{
case FZ_MOVETO:
x = path->items[i++].v;
y = path->items[i++].v;
printf("%g %g m\n", x, y);
break;
case FZ_LINETO:
x = path->items[i++].v;
y = path->items[i++].v;
printf("%g %g l\n", x, y);
break;
case FZ_CURVETO:
x = path->items[i++].v;
y = path->items[i++].v;
printf("%g %g ", x, y);
x = path->items[i++].v;
y = path->items[i++].v;
printf("%g %g ", x, y);
x = path->items[i++].v;
y = path->items[i++].v;
printf("%g %g c\n", x, y);
break;
case FZ_CLOSE_PATH:
printf("h\n");
break;
}
}
}
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