mirror of
https://github.com/Llewellynvdm/conky.git
synced 2024-11-19 11:35:12 +00:00
b79d465ed3
Unfortunately we can't use logging.h directly from conky as its in C++ and lua bindings only have access to a C compiler. Instead we now have a very simple C implementation of logging.h to use within the bindings. This change also adds NULL checks to catch some extra invalid states
123 lines
3.5 KiB
C
123 lines
3.5 KiB
C
/*
|
|
*
|
|
* Conky, a system monitor, based on torsmo
|
|
*
|
|
* Please see COPYING for details
|
|
*
|
|
* Copyright (c) 2005-2024 Brenden Matthews, Philip Kovacs, et. al.
|
|
* (see AUTHORS)
|
|
* All rights reserved.
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
*/
|
|
|
|
#ifndef _LIBCAIRO_IMAGE_HELPER_H_
|
|
#define _LIBCAIRO_IMAGE_HELPER_H_
|
|
|
|
#include <Imlib2.h>
|
|
#include <cairo.h>
|
|
|
|
#include "logging.h"
|
|
|
|
void cairo_draw_image(const char *file, cairo_surface_t *cs, int x, int y,
|
|
double scale_x, double scale_y, double *return_scale_w,
|
|
double *return_scale_h) {
|
|
int w, h, stride;
|
|
double scaled_w, scaled_h;
|
|
Imlib_Image alpha, premul;
|
|
cairo_surface_t *result;
|
|
cairo_t *cr;
|
|
|
|
if (!file) {
|
|
NORM_ERR("cairoimagehelper: File is NULL\n");
|
|
return;
|
|
}
|
|
|
|
if (!cs) {
|
|
NORM_ERR("cairoimagehelper: Surface is NULL\n");
|
|
return;
|
|
}
|
|
|
|
Imlib_Image *image = imlib_load_image(file);
|
|
if (!image) {
|
|
NORM_ERR("cairoimagehelper: Couldn't load %s\n", file);
|
|
return;
|
|
}
|
|
|
|
if ((scale_x <= 0.0) && (scale_y <= 0.0)) {
|
|
NORM_ERR("cairoimagehelper: Image Scale is 0, %s\n", file);
|
|
return;
|
|
}
|
|
|
|
imlib_context_set_image(image);
|
|
w = imlib_image_get_width();
|
|
h = imlib_image_get_height();
|
|
|
|
if ((w <= 0) && (h <= 0)) {
|
|
NORM_ERR("cairoimagehelper: %s has 0 size\n", file);
|
|
return;
|
|
}
|
|
|
|
scaled_w = *return_scale_w = scale_x * (double)w;
|
|
scaled_h = *return_scale_h = scale_y * (double)h;
|
|
|
|
if ((scaled_w <= 0.0) && (scaled_h <= 0.0)) {
|
|
NORM_ERR("cairoimagehelper: %s scaled image has 0 size\n", file);
|
|
return;
|
|
}
|
|
|
|
/* create scaled version of image to later extract the alpha channel */
|
|
alpha = imlib_create_cropped_scaled_image (0, 0, w, h, scaled_w, scaled_h);
|
|
|
|
/* create temporary image */
|
|
premul = imlib_create_image(scaled_w, scaled_h);
|
|
if (!premul) {
|
|
NORM_ERR("cairoimagehelper: Couldn't create premul image for %s\n", file);
|
|
return;
|
|
}
|
|
|
|
/* fill with opaque black */
|
|
imlib_context_set_image(premul);
|
|
imlib_context_set_color(0, 0, 0, 255);
|
|
imlib_image_fill_rectangle(0, 0, scaled_w, scaled_h);
|
|
|
|
/* blend source image on top -
|
|
* in effect this multiplies the rgb values by alpha */
|
|
imlib_blend_image_onto_image(image, 0, 0, 0, w, h, 0, 0, scaled_w, scaled_h);
|
|
|
|
/* and use the alpha channel of the source image */
|
|
imlib_image_copy_alpha_to_image(alpha, 0, 0);
|
|
|
|
stride = cairo_format_stride_for_width (CAIRO_FORMAT_ARGB32, scaled_w);
|
|
|
|
/* now pass the result to cairo */
|
|
result = cairo_image_surface_create_for_data(
|
|
(void *)imlib_image_get_data_for_reading_only(), CAIRO_FORMAT_ARGB32,
|
|
scaled_w, scaled_h, stride);
|
|
|
|
cr = cairo_create(cs);
|
|
cairo_set_source_surface(cr, result, x, y);
|
|
cairo_paint(cr);
|
|
|
|
imlib_context_set_image(image);
|
|
imlib_free_image();
|
|
imlib_context_set_image(premul);
|
|
imlib_free_image();
|
|
|
|
cairo_destroy(cr);
|
|
cairo_surface_destroy(result);
|
|
}
|
|
|
|
#endif /* _LIBCAIRO_IMAGE_HELPER_H_ */
|