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tools/libtxt/: add image drawing (future <IMG name> directive)

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This commit is contained in:
Werner Almesberger 2012-06-30 12:01:24 -03:00
parent e2eced62a2
commit 2a83110369
3 changed files with 47 additions and 19 deletions
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12
tools/libtxt/edit.c
View File

@ -17,7 +17,7 @@
#include "libtxt.h"
static int *do_edit(uint8_t *canvas, int width, int height,
static int do_edit(uint8_t *canvas, int width, int height,
const struct edit *e, const char **error)
{
struct image *img;
@ -48,6 +48,14 @@ static int *do_edit(uint8_t *canvas, int width, int height,
if (!font)
goto fail;
break;
case edit_img:
img = load_image(e->u.s, error);
if (!img)
return 0;
xo = draw_image(canvas, width, height, img, x, y);
free_image(img);
x += xo;
break;
case edit_spc:
spc = e->u.n;
break;
@ -73,9 +81,9 @@ static int *do_edit(uint8_t *canvas, int width, int height,
}
e = e->next;
}
return 1;
fail:
free_image(img);
free_font(font);
return 0;
}

50
tools/libtxt/font.c
View File

@ -246,34 +246,50 @@ void free_font(struct font *font)
/* ----- Drawing on a canvas ----------------------------------------------- */
static void do_draw(uint8_t *canvas, int width, int heigth,
const struct image *img, int ox, int oy, int w, int h, int x, int y)
{
int ix, iy, xt;
for (ix = 0; ix != w; ix++) {
if (x+ix >= width)
continue;
for (iy = 0; iy != h; iy++) {
if (y+iy >= heigth)
continue;
xt = ox+ix;
if (img->data[(oy+iy)*img->span+(xt >> 3)] &
(1 << (xt & 7))) {
xt = x+ix;
canvas[((y+iy)*width+xt) >> 3] |= 1 << (xt & 7);
}
}
}
}
int draw_image(void *canvas, int width, int height,
const struct image *img, int x, int y)
{
do_draw(canvas, width, height, img, 0, 0, img->w, img->h, x, y);
return img->w;
}
int draw_char(void *canvas, int width, int height,
const struct font *font, char c, int x, int y)
{
const struct image *img = font->img;
uint8_t *p = canvas;
const char *cp;
const struct sym *sym;
int ix, iy, xt;
cp = strchr(charset, c);
if (!cp)
return 0;
sym = font->sym+(cp-charset);
for (ix = 0; ix != sym->w; ix++) {
if (x+ix >= width)
continue;
for (iy = 0; iy != sym->h; iy++) {
if (y+iy >= height)
continue;
xt = sym->x+ix;
if (img->data[(sym->y+iy)*img->span+(xt >> 3)] &
(1 << (xt & 7))) {
xt = x+ix;
p[((y+iy)*width+xt) >> 3] |= 1 << (xt & 7);
}
}
}
do_draw(canvas, width, height,
font->img, sym->x, sym->y, sym->w, sym->h, x, y);
return sym->w;
}

4
tools/libtxt/libtxt.h
View File

@ -21,6 +21,7 @@ struct edit {
enum edit_type {
edit_string,
edit_font,
edit_img,
edit_spc,
edit_xoff,
edit_xpos,
@ -53,6 +54,9 @@ struct edit {
struct image *load_image(const char *name, const char **error);
void free_image(struct image *img);
int draw_image(void *canvas, int width, int height,
const struct image *img, int x, int y);
struct font *make_font(struct image *img, const char **error);
void free_font(struct font *font);