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backend_common: add blur kernel generation functions 

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
This commit is contained in:
Yuxuan Shui 2019-06-06 06:53:41 +01:00
parent b79266694b
commit b947a45d71
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GPG Key ID: 37C999F617EA1A47
1 changed files with 48 additions and 0 deletions
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48
src/backend/backend_common.c
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@ -280,6 +280,54 @@ default_backend_render_shadow(backend_t *backend_data, int width, int height,
return ret;
}
static struct conv **
generate_box_blur_kernel(int blur_size) {
int r = blur_size * 2 + 1;
assert(r > 0);
auto ret = ccalloc(3, struct conv *);
ret[0] = cvalloc(sizeof(struct conv) + sizeof(double) * (size_t)r);
ret[1] = cvalloc(sizeof(struct conv) + sizeof(double) * (size_t)r);
ret[0]->w = r; ret[0]->h = 1;
ret[1]->w = 1; ret[1]->h = r;
for (int i = 0; i < r; i++) {
ret[0]->data[i] = 1;
ret[1]->data[i] = 1;
}
return ret;
}
static struct conv **
generate_gaussian_blur_kernel(int blur_size, double blur_deviation) {
int r = blur_size * 2 + 1;
assert(r > 0);
auto ret = ccalloc(3, struct conv *);
ret[0] = cvalloc(sizeof(struct conv) + sizeof(double) * (size_t)r);
ret[1] = cvalloc(sizeof(struct conv) + sizeof(double) * (size_t)r);
ret[0]->w = r; ret[0]->h = 1;
ret[1]->w = 1; ret[1]->h = r;
for (int i = 0; i < r; i++) {
ret[0]->data[i] = 1;
ret[1]->data[i] = 1;
}
return ret;
}
/// Generate blur kernels for gaussian and box blur methods. Generated kernel is not
/// normalized, and the center element will always be 1.
struct conv **
generate_blur_kernel(enum blur_method method, int blur_size, double blur_deviation) {
assert(blur_size >= 0);
switch (method) {
case BLUR_METHOD_BOX:
return generate_box_blur_kernel(blur_size);
case BLUR_METHOD_GAUSSIAN:
return generate_gaussian_blur_kernel(blur_size, blur_deviation);
default:
break;
}
return NULL;
}
void init_backend_base(struct backend_base *base, session_t *ps) {
base->c = ps->c;
base->loop = ps->loop;