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/* Draw something on every frame of an animated image.
*
* compile with:
*
* gcc -g -Wall annotate-animated.c `pkg-config vips --cflags --libs`
*
* run with:
*
* annotate-animated ~/pics/3198.gif[n=-1] x.webp
*/
#include <vips/vips.h>
static int
annotate_image(VipsObject *context, VipsImage *image, VipsImage **out)
{
int page_height = vips_image_get_page_height(image);
int n_pages = image->Ysize / page_height;
VipsImage **overlay = (VipsImage **)
vips_object_local_array(context, n_pages);
VipsImage **page = (VipsImage **)
vips_object_local_array(context, n_pages);
VipsImage **annotated = (VipsImage **)
vips_object_local_array(context, n_pages);
/* Red as RGBA.
*/
double red[] = { 255, 0, 0, 255 };
double transparent[] = { 0, 0, 0, 0 };
int i;
/* Split the image into frames.
*/
for (i = 0; i < n_pages; i++)
if (vips_crop(image, &page[i],
0, page_height * i, image->Xsize, page_height, NULL))
return -1;
/* Make an overlay ... a solid red square, with a transparent hole.
*/
if (
!(overlay[0] = vips_image_new_from_image(page[0],
red, VIPS_NUMBER(red))) ||
vips_draw_rect(overlay[0],
transparent, VIPS_NUMBER(transparent),
10, 10, overlay[0]->Xsize - 20, overlay[0]->Ysize - 20,
"fill", TRUE,
NULL))
return -1;
/* Draw the overlay on every page.
*/
for (i = 0; i < n_pages; i++)
if (vips_composite2(page[i], overlay[0], &annotated[i],
VIPS_BLEND_MODE_OVER, NULL))
return -1;
/* Reassemble the frames.
*/
if (vips_arrayjoin(annotated, out, n_pages,
"across", 1,
NULL))
return -1;
return 0;
}
int
main(int argc, char **argv)
{
VipsImage *image;
VipsObject *context;
VipsImage *x;
if (VIPS_INIT(argv[0]))
vips_error_exit(NULL);
if (argc != 3)
vips_error_exit("usage: %s xxx.gif[n=-1] yyy.gif", argv[0]);
if (!(image = vips_image_new_from_file(argv[1],
"access", VIPS_ACCESS_SEQUENTIAL,
NULL)))
vips_error_exit(NULL);
context = VIPS_OBJECT(vips_image_new());
if (annotate_image(context, image, &x)) {
g_object_unref(image);
g_object_unref(context);
vips_error_exit(NULL);
}
g_object_unref(image);
g_object_unref(context);
image = x;
if (vips_image_write_to_file(image, argv[2], NULL)) {
g_object_unref(image);
vips_error_exit(NULL);
}
g_object_unref(image);
return 0;
}
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