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img: remove "theme" member from lab_img

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lab_img.theme member was referenced by "modifier" functions when drawing a
hover effect on button buffers or rounding the button buffer for corner
buttons, but this can be prone to use-after-free and was not very clean
because theme and lab_img were referencing each other.

Instead, let's just reference rc.theme in the modifier functions and
remove theme from lab_img.
This commit is contained in:
tokyo4j 2025-01-03 23:57:40 +09:00 • committed by Consolatis
parent 956b271f9b
commit 90a8c3e793
3 changed files with 15 additions and 20 deletions
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7
include/img/img.h
View file

@ -16,7 +16,6 @@ enum lab_img_type {
};
struct lab_img {
struct theme *theme; /* Used by modifier functions */
struct wl_array modifiers; /* lab_img_modifier_func_t */
struct lab_img_cache *cache;
};
@ -33,8 +32,7 @@ struct lab_img *lab_img_load(enum lab_img_type type, const char *path,
*/
struct lab_img *lab_img_load_from_bitmap(const char *bitmap, float *rgba);
typedef void (*lab_img_modifier_func_t)(struct theme *theme, cairo_t *cairo,
int w, int h);
typedef void (*lab_img_modifier_func_t)(cairo_t *cairo, int w, int h);
/**
* lab_img_copy() - Copy lab_img
@ -55,8 +53,7 @@ struct lab_img *lab_img_copy(struct lab_img *img);
* after the image is rendered on a buffer with lab_img_render(). For example,
* hover effects for window buttons can be drawn over the rendered image.
*/
void lab_img_add_modifier(struct lab_img *img, lab_img_modifier_func_t modifier,
struct theme *theme);
void lab_img_add_modifier(struct lab_img *img, lab_img_modifier_func_t modifier);
/**
* lab_img_render() - Render lab_img to a buffer

6
src/img/img.c
View file

@ -106,10 +106,8 @@ lab_img_copy(struct lab_img *img)
}
void
lab_img_add_modifier(struct lab_img *img, lab_img_modifier_func_t modifier,
struct theme *theme)
lab_img_add_modifier(struct lab_img *img, lab_img_modifier_func_t modifier)
{
img->theme = theme;
lab_img_modifier_func_t *mod = wl_array_add(&img->modifiers, sizeof(*mod));
*mod = modifier;
}
@ -185,7 +183,7 @@ lab_img_render(struct lab_img *img, int width, int height, int padding,
lab_img_modifier_func_t *modifier;
wl_array_for_each(modifier, &img->modifiers) {
cairo_save(cairo);
(*modifier)(img->theme, cairo, width, height);
(*modifier)(cairo, width, height);
cairo_restore(cairo);
}

22
src/theme.c
View file

@ -76,12 +76,12 @@ zdrop(struct lab_data_buffer **buffer)
/* Draw rounded-rectangular hover overlay on the button buffer */
static void
draw_hover_overlay_on_button(struct theme *theme, cairo_t *cairo, int w, int h)
draw_hover_overlay_on_button(cairo_t *cairo, int w, int h)
{
/* Overlay (pre-multiplied alpha) */
float overlay_color[4] = { 0.15f, 0.15f, 0.15f, 0.3f};
set_cairo_color(cairo, overlay_color);
int r = theme->window_button_hover_bg_corner_radius;
int r = rc.theme->window_button_hover_bg_corner_radius;
cairo_new_sub_path(cairo);
cairo_arc(cairo, r, r, r, 180 * deg, 270 * deg);
@ -97,16 +97,16 @@ draw_hover_overlay_on_button(struct theme *theme, cairo_t *cairo, int w, int h)
/* Round the buffer for the leftmost button in the titlebar */
static void
round_left_corner_button(struct theme *theme, cairo_t *cairo, int w, int h)
round_left_corner_button(cairo_t *cairo, int w, int h)
{
/*
* Position of the topleft corner of the titlebar relative to the
* leftmost button
*/
double x = -theme->window_titlebar_padding_width;
double y = -(theme->titlebar_height - theme->window_button_height) / 2;
double x = -rc.theme->window_titlebar_padding_width;
double y = -(rc.theme->titlebar_height - rc.theme->window_button_height) / 2;
double r = rc.corner_radius - (double)theme->border_width / 2.0;
double r = rc.corner_radius - (double)rc.theme->border_width / 2.0;
cairo_new_sub_path(cairo);
cairo_arc(cairo, x + r, y + r, r, deg * 180, deg * 270);
@ -122,7 +122,7 @@ round_left_corner_button(struct theme *theme, cairo_t *cairo, int w, int h)
/* Round the buffer for the rightmost button in the titlebar */
static void
round_right_corner_button(struct theme *theme, cairo_t *cairo, int w, int h)
round_right_corner_button(cairo_t *cairo, int w, int h)
{
/*
* Horizontally flip the cairo context so we can reuse
@ -130,7 +130,7 @@ round_right_corner_button(struct theme *theme, cairo_t *cairo, int w, int h)
*/
cairo_scale(cairo, -1, 1);
cairo_translate(cairo, -w, 0);
round_left_corner_button(theme, cairo, w, h);
round_left_corner_button(cairo, w, h);
}
/*
@ -223,7 +223,7 @@ load_button(struct theme *theme, struct button *b, int active)
button_imgs[b->type][b->state_set & ~LAB_BS_HOVERD];
*img = lab_img_copy(non_hover_img);
lab_img_add_modifier(*img,
draw_hover_overlay_on_button, theme);
draw_hover_overlay_on_button);
}
/*
@ -239,7 +239,7 @@ load_button(struct theme *theme, struct button *b, int active)
if (leftmost_button->type == b->type) {
*rounded_img = lab_img_copy(*img);
lab_img_add_modifier(*rounded_img,
round_left_corner_button, theme);
round_left_corner_button);
}
break;
}
@ -249,7 +249,7 @@ load_button(struct theme *theme, struct button *b, int active)
if (rightmost_button->type == b->type) {
*rounded_img = lab_img_copy(*img);
lab_img_add_modifier(*rounded_img,
round_right_corner_button, theme);
round_right_corner_button);
}
break;
}