mirror of
https://github.com/labwc/labwc.git
synced 2025-11-04 13:30:07 -05:00
d0aff49c81
...and in preparation for the merge-config patch, avoid building directory lists for empty filenames.
76 lines
1.8 KiB
C
76 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright (C) Johan Malm 2023
|
|
*/
|
|
#define _POSIX_C_SOURCE 200809L
|
|
#include <cairo.h>
|
|
#include <png.h>
|
|
#include <stdbool.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <wlr/util/log.h>
|
|
#include "buffer.h"
|
|
#include "button/button-png.h"
|
|
#include "button/common.h"
|
|
#include "labwc.h"
|
|
|
|
/*
|
|
* cairo_image_surface_create_from_png() does not gracefully handle non-png
|
|
* files, so we verify the header before trying to read the rest of the file.
|
|
*/
|
|
#define PNG_BYTES_TO_CHECK (4)
|
|
static bool
|
|
ispng(const char *filename)
|
|
{
|
|
unsigned char header[PNG_BYTES_TO_CHECK];
|
|
FILE *fp = fopen(filename, "rb");
|
|
if (!fp) {
|
|
return false;
|
|
}
|
|
if (fread(header, 1, PNG_BYTES_TO_CHECK, fp) != PNG_BYTES_TO_CHECK) {
|
|
fclose(fp);
|
|
return false;
|
|
}
|
|
if (png_sig_cmp(header, (png_size_t)0, PNG_BYTES_TO_CHECK)) {
|
|
wlr_log(WLR_ERROR, "file '%s' is not a recognised png file", filename);
|
|
fclose(fp);
|
|
return false;
|
|
}
|
|
fclose(fp);
|
|
return true;
|
|
}
|
|
|
|
#undef PNG_BYTES_TO_CHECK
|
|
|
|
void
|
|
button_png_load(const char *button_name, struct lab_data_buffer **buffer)
|
|
{
|
|
if (*buffer) {
|
|
wlr_buffer_drop(&(*buffer)->base);
|
|
*buffer = NULL;
|
|
}
|
|
if (!button_name || !*button_name) {
|
|
return;
|
|
}
|
|
|
|
char path[4096] = { 0 };
|
|
button_filename(button_name, path, sizeof(path));
|
|
if (!ispng(path)) {
|
|
return;
|
|
}
|
|
|
|
cairo_surface_t *image = cairo_image_surface_create_from_png(path);
|
|
if (cairo_surface_status(image)) {
|
|
wlr_log(WLR_ERROR, "error reading png button '%s'", path);
|
|
cairo_surface_destroy(image);
|
|
return;
|
|
}
|
|
cairo_surface_flush(image);
|
|
|
|
double w = cairo_image_surface_get_width(image);
|
|
double h = cairo_image_surface_get_height(image);
|
|
*buffer = buffer_create_cairo((int)w, (int)h, 1.0, true);
|
|
cairo_t *cairo = (*buffer)->cairo;
|
|
cairo_set_source_surface(cairo, image, 0, 0);
|
|
cairo_paint_with_alpha(cairo, 1.0);
|
|
}
|