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Merge pull request #186 from yshui/malloc-blur-passes 

Lift the MAX_BLUR_PASS limit
This commit is contained in:
yshui 2019-06-07 07:09:51 +01:00 committed by GitHub
parent cbb859ba3c abb089e605
commit dc7050cb00
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
14 changed files with 120 additions and 108 deletions
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17
src/backend/gl/gl_common.c
View File

@ -388,7 +388,6 @@ bool gl_blur(backend_t *base, double opacity, const region_t *reg_blur,
glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, extent->x1, dst_y, width, height);
for (int i = 0; i < gd->npasses; ++i) {
assert(i < MAX_BLUR_PASS - 1);
const gl_blur_shader_t *p = &gd->blur_shader[i];
assert(p->prog);
@ -668,6 +667,9 @@ static bool gl_init_blur(struct gl_data *gd, conv *const *const kernels) {
return true;
}
for (gd->npasses = 0; kernels[gd->npasses]; gd->npasses++);
gd->blur_shader = ccalloc(gd->npasses, gl_blur_shader_t);
char *lc_numeric_old = strdup(setlocale(LC_NUMERIC, NULL));
// Enforce LC_NUMERIC locale "C" here to make sure decimal point is sane
// Thanks to hiciu for reporting.
@ -698,8 +700,7 @@ static bool gl_init_blur(struct gl_data *gd, conv *const *const kernels) {
const char *shader_add = FRAG_SHADER_BLUR_ADD;
char *extension = strdup("");
gl_blur_shader_t *passes = gd->blur_shader;
for (int i = 0; i < MAX_BLUR_PASS && kernels[i]; gd->npasses = ++i) {
for (int i = 0; kernels[i]; i++) {
auto kern = kernels[i];
// Build shader
int width = kern->w, height = kern->h;
@ -728,7 +729,7 @@ static bool gl_init_blur(struct gl_data *gd, conv *const *const kernels) {
}
}
auto pass = passes + i;
auto pass = gd->blur_shader + i;
size_t shader_len = strlen(FRAG_SHADER_BLUR) + strlen(extension) +
strlen(shader_body) + 10 /* sum */ +
1 /* null terminator */;
@ -812,10 +813,6 @@ const char *win_shader_glsl = GLSL(330,
bool gl_init(struct gl_data *gd, session_t *ps) {
// Initialize GLX data structure
for (int i = 0; i < MAX_BLUR_PASS; ++i) {
gd->blur_shader[i] = (gl_blur_shader_t){.prog = 0};
}
glDisable(GL_DEPTH_TEST);
glDepthMask(GL_FALSE);
@ -833,7 +830,6 @@ bool gl_init(struct gl_data *gd, session_t *ps) {
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
gd->npasses = 0;
gl_win_shader_from_string(vertex_shader, win_shader_glsl, &gd->win_shader);
if (!gl_init_blur(gd, ps->o.blur_kerns)) {
return false;
@ -874,9 +870,10 @@ static inline void gl_free_blur_shader(gl_blur_shader_t *shader) {
void gl_deinit(struct gl_data *gd) {
// Free GLSL shaders/programs
for (int i = 0; i < MAX_BLUR_PASS; ++i) {
for (int i = 0; i < gd->npasses; ++i) {
gl_free_blur_shader(&gd->blur_shader[i]);
}
free(gd->blur_shader);
gl_free_prog_main(&gd->win_shader);

2
src/backend/gl/gl_common.h
View File

@ -69,7 +69,7 @@ struct gl_data {
int npasses;
gl_win_shader_t win_shader;
gl_fill_shader_t fill_shader;
gl_blur_shader_t blur_shader[MAX_BLUR_PASS];
gl_blur_shader_t *blur_shader;
// Temporary textures used for blurring. They are always the same size as the
// target, so they are always big enough without resizing.

23
src/backend/xrender/xrender.c
View File

@ -60,9 +60,7 @@ typedef struct _xrender_data {
int target_width, target_height;
/// Blur kernels converted to X format
xcb_render_fixed_t *x_blur_kern[MAX_BLUR_PASS];
/// Number of elements in each blur kernel
int x_blur_kern_size[MAX_BLUR_PASS];
struct x_convolution_kernel **x_blur_kern;
xcb_special_event_t *present_event;
} xrender_data;
@ -178,15 +176,13 @@ static bool blur(backend_t *backend_data, double opacity, const region_t *reg_bl
// back -(pass 1)-> tmp0 -(copy)-> target_buffer
int i;
for (i = 0; xd->x_blur_kern[i]; i++) {
assert(i < MAX_BLUR_PASS - 1);
// Copy from source picture to destination. The filter must
// be applied on source picture, to get the nearby pixels outside the
// window.
// TODO cache converted blur_kerns
xcb_render_set_picture_filter(
c, src_pict, to_u16_checked(strlen(filter)), filter,
to_u32_checked(xd->x_blur_kern_size[i]), xd->x_blur_kern[i]);
to_u32_checked(xd->x_blur_kern[i]->size), xd->x_blur_kern[i]->kernel);
if (xd->x_blur_kern[i + 1] || i == 0) {
// This is not the last pass, or this is the first pass
@ -276,6 +272,7 @@ static void deinit(backend_t *backend_data) {
for (int i = 0; xd->x_blur_kern[i]; i++) {
free(xd->x_blur_kern[i]);
}
free(xd->x_blur_kern);
if (xd->present_event) {
xcb_unregister_for_special_event(xd->base.c, xd->present_event);
}
@ -377,8 +374,8 @@ static bool image_op(backend_t *base, enum image_operations op, void *image,
XCB_NONE, tmp_pict, 0, 0, 0, 0, 0, 0, tmpw, tmph);
xcb_render_composite(base->c, XCB_RENDER_PICT_OP_DIFFERENCE,
xd->white_pixel, XCB_NONE, img->pict, 0, 0, 0,
0, 0, 0, tmpw, tmph);
xd->white_pixel, XCB_NONE, img->pict, 0, 0,
0, 0, 0, 0, tmpw, tmph);
xcb_render_composite(base->c, XCB_RENDER_PICT_OP_IN_REVERSE,
tmp_pict, XCB_NONE, img->pict, 0, 0, 0, 0, 0,
0, tmpw, tmph);
@ -549,10 +546,14 @@ backend_t *backend_xrender_init(session_t *ps) {
xd->root_pict = x_create_picture_with_visual_and_pixmap(
ps->c, ps->vis, root_pixmap, 0, NULL);
}
int npasses = 0;
for (; ps->o.blur_kerns[npasses]; npasses++)
;
// +1 for null terminator
xd->x_blur_kern = ccalloc(npasses + 1, struct x_convolution_kernel *);
for (int i = 0; ps->o.blur_kerns[i]; i++) {
assert(i < MAX_BLUR_PASS - 1);
xd->x_blur_kern_size[i] = x_picture_filter_from_conv(
ps->o.blur_kerns[i], 1, &xd->x_blur_kern[i], (size_t[]){0});
x_create_convolution_kernel(ps->o.blur_kerns[i], 1, &xd->x_blur_kern[i]);
}
return &xd->base;
err:

2
src/common.h
View File

@ -224,7 +224,7 @@ typedef struct session {
/// ignore linked list.
ignore_t **ignore_tail;
// Cached blur convolution kernels.
xcb_render_fixed_t *blur_kerns_cache[MAX_BLUR_PASS];
struct x_convolution_kernel **blur_kerns_cache;
/// Reset program after next paint.
bool reset:1;
/// If compton should quit

4
src/compton.c
View File

@ -2010,10 +2010,10 @@ static void session_destroy(session_t *ps) {
free(ps->o.write_pid_path);
free(ps->o.logpath);
for (int i = 0; i < MAX_BLUR_PASS; ++i) {
for (int i = 0; ps->o.blur_kerns[i]; ++i) {
free(ps->o.blur_kerns[i]);
free(ps->blur_kerns_cache[i]);
}
free(ps->o.blur_kerns);
free(ps->o.glx_fshader_win_str);
free_xinerama_info(ps);

47
src/config.c
View File

@ -193,13 +193,10 @@ err1:
* Parse a list of convolution kernels.
*
* @param[in] src string to parse
* @param[out] dest pointer to an array of kernels, must points to an array
* of `max` elements.
* @param[in] max maximum number of kernels supported
* @param[out] hasneg whether any of the kernels have negative values
* @return if the `src` string is a valid kernel list string
* @return the kernels
*/
bool parse_blur_kern_lst(const char *src, conv **dest, int max, bool *hasneg) {
struct conv **parse_blur_kern_lst(const char *src, bool *hasneg) {
// TODO just return a predefined kernels, not parse predefined strings...
static const struct {
const char *name;
@ -258,26 +255,33 @@ bool parse_blur_kern_lst(const char *src, conv **dest, int max, bool *hasneg) {
for (unsigned int i = 0;
i < sizeof(CONV_KERN_PREDEF) / sizeof(CONV_KERN_PREDEF[0]); ++i) {
if (!strcmp(CONV_KERN_PREDEF[i].name, src))
return parse_blur_kern_lst(CONV_KERN_PREDEF[i].kern_str, dest,
max, hasneg);
return parse_blur_kern_lst(CONV_KERN_PREDEF[i].kern_str, hasneg);
}
int nkernels = 1;
for (int i = 0; src[i]; i++) {
if (src[i] == ';') {
nkernels++;
}
}
struct conv **ret = ccalloc(nkernels+1, struct conv *); // +1 for NULL terminator
int i = 0;
const char *pc = src;
// Free old kernels
for (i = 0; i < max; ++i) {
free(dest[i]);
dest[i] = NULL;
}
// Continue parsing until the end of source string
i = 0;
while (pc && *pc && i < max - 1) {
while (pc && *pc) {
bool tmp_hasneg;
dest[i] = parse_blur_kern(pc, &pc, &tmp_hasneg);
if (!dest[i]) {
return false;
assert(i < nkernels);
ret[i] = parse_blur_kern(pc, &pc, &tmp_hasneg);
if (!ret[i]) {
for (int j = 0; j < i; j++) {
free(ret[j]);
}
free(ret);
return NULL;
}
i++;
*hasneg |= tmp_hasneg;
@ -290,12 +294,7 @@ bool parse_blur_kern_lst(const char *src, conv **dest, int max, bool *hasneg) {
"removed in future releases");
}
if (*pc) {
log_error("Too many blur kernels!");
return false;
}
return true;
return ret;
}
/**
@ -541,7 +540,7 @@ char *parse_config(options_t *opt, const char *config_file, bool *shadow_enable,
.blur_background_frame = false,
.blur_background_fixed = false,
.blur_background_blacklist = NULL,
.blur_kerns = {NULL},
.blur_kerns = NULL,
.inactive_dim = 0.0,
.inactive_dim_fixed = false,
.invert_color_list = NULL,

10
src/config.h
View File

@ -64,12 +64,6 @@ typedef struct win_option {
typedef struct _c2_lptr c2_lptr_t;
// This macro is here because this is the maximum number
// of blur passes options_t can hold, not a limitation of
// rendering.
/// @brief Maximum passes for blur.
#define MAX_BLUR_PASS 5
/// Structure representing all options.
typedef struct options {
// === Debugging ===
@ -203,7 +197,7 @@ typedef struct options {
/// Background blur blacklist. A linked list of conditions.
c2_lptr_t *blur_background_blacklist;
/// Blur convolution kernel.
conv *blur_kerns[MAX_BLUR_PASS];
struct conv **blur_kerns;
/// How much to dim an inactive window. 0.0 - 1.0, 0 to disable.
double inactive_dim;
/// Whether to use fixed inactive dim opacity, instead of deciding
@ -239,7 +233,7 @@ extern const char *const BACKEND_STRS[NUM_BKEND + 1];
bool must_use parse_long(const char *, long *);
bool must_use parse_int(const char *, int *);
bool must_use parse_blur_kern_lst(const char *, conv **, int, bool *hasneg);
struct conv **must_use parse_blur_kern_lst(const char *, bool *hasneg);
bool must_use parse_geometry(session_t *, const char *, region_t *);
bool must_use parse_rule_opacity(c2_lptr_t **, const char *);
enum blur_method must_use parse_blur_method(const char *src);

18
src/config_libconfig.c
View File

@ -379,10 +379,12 @@ char *parse_config_libconfig(options_t *opt, const char *config_file, bool *shad
// --blur-background-fixed
lcfg_lookup_bool(&cfg, "blur-background-fixed", &opt->blur_background_fixed);
// --blur-kern
if (config_lookup_string(&cfg, "blur-kern", &sval) &&
!parse_blur_kern_lst(sval, opt->blur_kerns, MAX_BLUR_PASS, conv_kern_hasneg)) {
log_fatal("Cannot parse \"blur-kern\"");
goto err;
if (config_lookup_string(&cfg, "blur-kern", &sval)) {
opt->blur_kerns = parse_blur_kern_lst(sval, conv_kern_hasneg);
if (!opt->blur_kerns) {
log_fatal("Cannot parse \"blur-kern\"");
goto err;
}
}
// --resize-damage
config_lookup_int(&cfg, "resize-damage", &opt->resize_damage);
@ -448,7 +450,6 @@ char *parse_config_libconfig(options_t *opt, const char *config_file, bool *shad
}
config_setting_t *blur_cfg = config_lookup(&cfg, "blur");
// This is not a loop
if (blur_cfg) {
if (config_setting_lookup_string(blur_cfg, "method", &sval)) {
enum blur_method method = parse_blur_method(sval);
@ -463,12 +464,9 @@ char *parse_config_libconfig(options_t *opt, const char *config_file, bool *shad
config_setting_lookup_int(blur_cfg, "size", &opt->blur_radius);
if (config_setting_lookup_string(blur_cfg, "kernel", &sval)) {
struct conv *kerns[5];
if (!parse_blur_kern_lst(sval, kerns, MAX_BLUR_PASS,
conv_kern_hasneg)) {
opt->blur_kerns = parse_blur_kern_lst(sval, conv_kern_hasneg);
if (!opt->blur_kerns) {
log_warn("Failed to parse blur kernel: %s", sval);
} else {
memcpy(opt->blur_kerns, kerns, sizeof kerns);
}
}

16
src/opengl.c
View File

@ -24,9 +24,9 @@
#include "log.h"
#include "region.h"
#include "string_utils.h"
#include "uthash_extra.h"
#include "utils.h"
#include "win.h"
#include "uthash_extra.h"
#include "opengl.h"
@ -89,7 +89,13 @@ bool glx_init(session_t *ps, bool need_render) {
ps->psglx = cmalloc(glx_session_t);
memcpy(ps->psglx, &CGLX_SESSION_DEF, sizeof(glx_session_t));
for (int i = 0; i < MAX_BLUR_PASS; ++i) {
int npasses;
for (npasses = 0; ps->o.blur_kerns[npasses]; npasses++)
;
// +1 for the zero terminator
ps->psglx->blur_passes = ccalloc(npasses + 1, glx_blur_pass_t);
for (int i = 0; ps->o.blur_kerns[i]; ++i) {
glx_blur_pass_t *ppass = &ps->psglx->blur_passes[i];
ppass->unifm_factor_center = -1;
ppass->unifm_offset_x = -1;
@ -230,13 +236,14 @@ void glx_destroy(session_t *ps) {
}
// Free GLSL shaders/programs
for (int i = 0; i < MAX_BLUR_PASS; ++i) {
for (int i = 0; ps->psglx->blur_passes[i].prog; ++i) {
glx_blur_pass_t *ppass = &ps->psglx->blur_passes[i];
if (ppass->frag_shader)
glDeleteShader(ppass->frag_shader);
if (ppass->prog)
glDeleteProgram(ppass->prog);
}
free(ps->psglx->blur_passes);
glx_free_prog_main(ps, &ps->glx_prog_win);
@ -324,7 +331,7 @@ bool glx_init_blur(session_t *ps) {
extension = strdup("");
}
for (int i = 0; i < MAX_BLUR_PASS && ps->o.blur_kerns[i]; ++i) {
for (int i = 0; ps->o.blur_kerns[i]; ++i) {
auto kern = ps->o.blur_kerns[i];
glx_blur_pass_t *ppass = &ps->psglx->blur_passes[i];
@ -783,7 +790,6 @@ bool glx_blur_dst(session_t *ps, int dx, int dy, int width, int height, float z,
bool last_pass = false;
for (int i = 0; !last_pass; ++i) {
last_pass = !ps->psglx->blur_passes[i + 1].prog;
assert(i < MAX_BLUR_PASS - 1);
const glx_blur_pass_t *ppass = &ps->psglx->blur_passes[i];
assert(ppass->prog);

2
src/opengl.h
View File

@ -48,7 +48,7 @@ typedef struct glx_session {
bool has_texture_non_power_of_two;
/// Current GLX Z value.
int z;
glx_blur_pass_t blur_passes[MAX_BLUR_PASS];
glx_blur_pass_t *blur_passes;
} glx_session_t;
/// @brief Wrapper of a binded GLX texture.

12
src/options.c
View File

@ -710,9 +710,10 @@ void get_cfg(options_t *opt, int argc, char *const *argv, bool shadow_enable,
break;
case 301:
// --blur-kern
if (!parse_blur_kern_lst(optarg, opt->blur_kerns,
MAX_BLUR_PASS, &conv_kern_hasneg))
opt->blur_kerns = parse_blur_kern_lst(optarg, &conv_kern_hasneg);
if (!opt->blur_kerns) {
exit(1);
}
break;
P_CASEINT(302, resize_damage);
case 303:
@ -816,9 +817,10 @@ void get_cfg(options_t *opt, int argc, char *const *argv, bool shadow_enable,
}
// Fill default blur kernel
if (opt->blur_method == BLUR_METHOD_KERNEL && !opt->blur_kerns[0]) {
CHECK(parse_blur_kern_lst("3x3box", opt->blur_kerns, MAX_BLUR_PASS,
&conv_kern_hasneg));
if (opt->blur_method == BLUR_METHOD_KERNEL &&
(!opt->blur_kerns || !opt->blur_kerns[0])) {
opt->blur_kerns = parse_blur_kern_lst("3x3box", &conv_kern_hasneg);
CHECK(opt->blur_kerns);
}
if (opt->resize_damage < 0) {

42
src/render.c
View File

@ -618,7 +618,7 @@ win_paint_shadow(session_t *ps, struct managed_win *w, region_t *reg_paint) {
*/
static bool xr_blur_dst(session_t *ps, xcb_render_picture_t tgt_buffer, int16_t x,
int16_t y, uint16_t wid, uint16_t hei,
xcb_render_fixed_t **blur_kerns, const region_t *reg_clip) {
struct x_convolution_kernel **blur_kerns, const region_t *reg_clip) {
assert(blur_kerns[0]);
// Directly copying from tgt_buffer to it does not work, so we create a
@ -636,8 +636,7 @@ static bool xr_blur_dst(session_t *ps, xcb_render_picture_t tgt_buffer, int16_t
xcb_render_picture_t src_pict = tgt_buffer, dst_pict = tmp_picture;
for (int i = 0; blur_kerns[i]; ++i) {
assert(i < MAX_BLUR_PASS - 1);
xcb_render_fixed_t *convolution_blur = blur_kerns[i];
xcb_render_fixed_t *convolution_blur = blur_kerns[i]->kernel;
// `x / 65536.0` converts from X fixed point to double
int kwid = (int)((double)convolution_blur[0] / 65536.0),
khei = (int)((double)convolution_blur[1] / 65536.0);
@ -675,8 +674,8 @@ static bool xr_blur_dst(session_t *ps, xcb_render_picture_t tgt_buffer, int16_t
* Blur the background of a window.
*/
static inline void
win_blur_background(session_t *ps, struct managed_win *w,
xcb_render_picture_t tgt_buffer, const region_t *reg_paint) {
win_blur_background(session_t *ps, struct managed_win *w, xcb_render_picture_t tgt_buffer,
const region_t *reg_paint) {
const int16_t x = w->g.x;
const int16_t y = w->g.y;
const auto wid = to_u16_checked(w->widthb);
@ -694,30 +693,22 @@ win_blur_background(session_t *ps, struct managed_win *w,
case BKEND_XRENDER:
case BKEND_XR_GLX_HYBRID: {
// Normalize blur kernels
for (int i = 0; i < MAX_BLUR_PASS; ++i) {
for (int i = 0; ps->o.blur_kerns[i]; ++i) {
// Note: `x * 65536` converts double `x` to a X fixed point
// representation. `x / 65536` is the other way.
auto kern_src = ps->o.blur_kerns[i];
xcb_render_fixed_t *kern_dst = ps->blur_kerns_cache[i];
assert(i < MAX_BLUR_PASS);
if (!kern_src) {
assert(!kern_dst);
break;
}
auto kern_dst = ps->blur_kerns_cache[i];
assert(!kern_dst || (kern_src->w == kern_dst[0] / 65536 &&
kern_src->h == kern_dst[1] / 65536));
assert(!kern_dst || (kern_src->w == kern_dst->kernel[0] / 65536 &&
kern_src->h == kern_dst->kernel[1] / 65536));
// Skip for fixed factor_center if the cache exists already
if (ps->o.blur_background_fixed && kern_dst) {
continue;
}
// If kern_dst is allocated, it's always allocated to the right
// size
size_t size = kern_dst ? (size_t)(kern_src->w * kern_src->h + 2) : 0;
x_picture_filter_from_conv(kern_src, factor_center, &kern_dst, &size);
ps->blur_kerns_cache[i] = kern_dst;
x_create_convolution_kernel(kern_src, factor_center,
&ps->blur_kerns_cache[i]);
}
// Minimize the region we try to blur, if the window itself is not
@ -1143,7 +1134,13 @@ bool init_render(session_t *ps) {
}
// Blur filter
if (ps->o.blur_method || ps->o.blur_background_frame) {
if (ps->o.blur_method) {
int npasses;
for (npasses = 0; ps->o.blur_kerns[npasses]; npasses++)
;
// +1 for NULL terminator
ps->blur_kerns_cache = ccalloc(npasses+1, struct x_convolution_kernel *);
bool ret = false;
if (ps->o.backend == BKEND_GLX) {
#ifdef CONFIG_OPENGL
@ -1225,6 +1222,11 @@ void deinit_render(session_t *ps) {
glx_destroy(ps);
}
#endif
for (int i = 0; ps->blur_kerns_cache[i]; i++) {
free(ps->blur_kerns_cache[i]);
}
free(ps->blur_kerns_cache);
}
// vim: set ts=8 sw=8 noet :

23
src/x.c
View File

@ -13,6 +13,7 @@
#include <xcb/xcb_renderutil.h>
#include <xcb/xfixes.h>
#include "atom.h"
#include "backend/gl/glx.h"
#include "common.h"
#include "compiler.h"
@ -20,7 +21,6 @@
#include "log.h"
#include "region.h"
#include "utils.h"
#include "atom.h"
#include "x.h"
/**
@ -528,15 +528,23 @@ bool x_fence_sync(xcb_connection_t *c, xcb_sync_fence_t f) {
* @param[inout] size size of the array pointed to by `ret`, in number of elements
* @return number of elements filled into `*ret`
*/
int x_picture_filter_from_conv(const conv *kernel, double center,
xcb_render_fixed_t **ret, size_t *size) {
if (*size < (size_t)(kernel->w * kernel->h + 2)) {
*size = (size_t)(kernel->w * kernel->h + 2);
*ret = crealloc(*ret, *size);
void x_create_convolution_kernel(const conv *kernel, double center,
struct x_convolution_kernel **ret) {
assert(ret);
if (!*ret || (*ret)->capacity < kernel->w * kernel->h + 2) {
free(*ret);
*ret =
cvalloc(sizeof(struct x_convolution_kernel) +
(size_t)(kernel->w * kernel->h + 2) * sizeof(xcb_render_fixed_t));
(*ret)->capacity = kernel->w * kernel->h + 2;
}
auto buf = *ret;
(*ret)->size = kernel->w * kernel->h + 2;
auto buf = (*ret)->kernel;
buf[0] = DOUBLE_TO_XFIXED(kernel->w);
buf[1] = DOUBLE_TO_XFIXED(kernel->h);
double sum = center;
for (int i = 0; i < kernel->w * kernel->h; i++) {
sum += kernel->data[i];
@ -551,7 +559,6 @@ int x_picture_filter_from_conv(const conv *kernel, double center,
buf[kernel->h / 2 * kernel->w + kernel->w / 2 + 2] =
DOUBLE_TO_XFIXED(center * factor);
return kernel->w * kernel->h + 2;
}
/// Generate a search criteria for fbconfig from a X visual.

10
src/x.h
View File

@ -223,6 +223,12 @@ bool x_is_root_back_pixmap_atom(session_t *ps, xcb_atom_t atom);
bool x_fence_sync(xcb_connection_t *, xcb_sync_fence_t);
struct x_convolution_kernel {
int size;
int capacity;
xcb_render_fixed_t kernel[];
};
/**
* Convert a struct conv to a X picture convolution filter, normalizing the kernel
* in the process. Allow the caller to specify the element at the center of the kernel,
@ -234,8 +240,8 @@ bool x_fence_sync(xcb_connection_t *, xcb_sync_fence_t);
* will be allocated, and `*ret` will be updated.
* @param[inout] size size of the array pointed to by `ret`.
*/
int x_picture_filter_from_conv(const conv *kernel, double center,
xcb_render_fixed_t **ret, size_t *size);
void attr_nonnull(1, 3) x_create_convolution_kernel(const conv *kernel, double center,
struct x_convolution_kernel **ret);
/// Generate a search criteria for fbconfig from a X visual.
/// Returns {-1, -1, -1, -1, -1, -1} on failure