Пересобранный и видоизмененный conky для ОСГОС

lua/libcairo_imlib2_helper.h

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+/*
+ *
+ * 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_place_image(const char *file, cairo_t *cr, int x, int y,
+                       int width, int height, double alpha) {
+  int w, h, stride;
+  Imlib_Image alpha_image, image, premul;
+  cairo_surface_t *result;
+
+  if (!file) {
+    NORM_ERR("cairoimagehelper: File is NULL\n");
+    return;
+  }
+
+  if (!cr) {
+    NORM_ERR("cairoimagehelper: cairo_t is NULL\n");
+    return;
+  }
+
+  image = (Imlib_Image *)imlib_load_image(file);
+  if (!image) {
+    NORM_ERR("cairoimagehelper: Couldn't load %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;
+  }
+
+  /* create scaled version of image to later extract the alpha channel */
+  alpha_image = imlib_create_cropped_scaled_image(0, 0, w, h, width, height);
+
+  /* create temporary image */
+  premul = imlib_create_image(width, height);
+  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, width, height);
+
+  /* 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, width, height);
+
+  /* and use the alpha channel of the source image */
+  imlib_image_copy_alpha_to_image(alpha_image, 0, 0);
+
+  stride = cairo_format_stride_for_width (CAIRO_FORMAT_ARGB32, width);
+
+  /* now pass the result to cairo */
+  result = cairo_image_surface_create_for_data(
+      (unsigned char  *)imlib_image_get_data_for_reading_only(), CAIRO_FORMAT_ARGB32,
+      width, height, stride);
+
+  cairo_set_source_surface(cr, result, x, y);
+  cairo_paint_with_alpha(cr, alpha);
+
+  imlib_context_set_image(alpha_image);
+  imlib_free_image();
+  imlib_context_set_image(image);
+  imlib_free_image();
+  imlib_context_set_image(premul);
+  imlib_free_image();
+
+  cairo_surface_destroy(result);
+
+}
+
+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) {
+  cairo_t *cr;
+  int w, h;
+  double scaled_w, scaled_h;
+
+  if (!file) {
+    NORM_ERR("cairoimagehelper: File is NULL\n");
+    return;
+  }
+
+  if (!cs) {
+    NORM_ERR("cairoimagehelper: Surface is NULL\n");
+    return;
+  }
+
+  if ((scale_x <= 0.0) && (scale_y <= 0.0)) {
+    NORM_ERR("cairoimagehelper: Image Scale is 0, %s\n", file);
+    return;
+  }
+
+  Imlib_Image *image = (Imlib_Image *)imlib_load_image(file);
+  if (!image) {
+    NORM_ERR("cairoimagehelper: Couldn't load %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;
+  }
+
+  cr = cairo_create(cs);
+  cairo_place_image(file, cr, x, y, scaled_w, scaled_h, 1.0);
+
+  cairo_destroy(cr);
+}
+
+#endif /* _LIBCAIRO_IMAGE_HELPER_H_ */