dwm picom added

dwm/picom/src/backend/backend_common.h

@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: MPL-2.0
+// Copyright (c) Yuxuan Shui <yshuiv7@gmail.com>
+#pragma once
+
+#include <xcb/render.h>
+#include <xcb/xcb_image.h>
+
+#include <stdbool.h>
+
+#include "backend.h"
+#include "config.h"
+#include "region.h"
+
+typedef struct session session_t;
+typedef struct win win;
+typedef struct conv conv;
+typedef struct backend_base backend_t;
+struct backend_operations;
+
+struct dual_kawase_params {
+	/// Number of downsample passes
+	int iterations;
+	/// Pixel offset for down- and upsample
+	float offset;
+	/// Save area around blur target (@ref resize_width, @ref resize_height)
+	int expand;
+};
+
+struct backend_image_inner_base {
+	int refcount;
+	bool has_alpha;
+};
+
+struct backend_image {
+	// Backend dependent inner image data
+	struct backend_image_inner_base *inner;
+	double opacity;
+	double dim;
+	double max_brightness;
+	double corner_radius;
+	// Effective size of the image
+	int ewidth, eheight;
+	bool color_inverted;
+	int border_width;
+};
+
+bool build_shadow(xcb_connection_t *, xcb_drawable_t, double opacity, int width,
+                  int height, const conv *kernel, xcb_render_picture_t shadow_pixel,
+                  xcb_pixmap_t *pixmap, xcb_render_picture_t *pict);
+
+xcb_render_picture_t solid_picture(xcb_connection_t *, xcb_drawable_t, bool argb,
+                                   double a, double r, double g, double b);
+
+xcb_image_t *
+make_shadow(xcb_connection_t *c, const conv *kernel, double opacity, int width, int height);
+
+/// The default implementation of `is_win_transparent`, it simply looks at win::mode. So
+/// this is not suitable for backends that alter the content of windows
+bool default_is_win_transparent(void *, win *, void *);
+
+/// The default implementation of `is_frame_transparent`, it uses win::frame_opacity. Same
+/// caveat as `default_is_win_transparent` applies.
+bool default_is_frame_transparent(void *, win *, void *);
+
+void *
+default_backend_render_shadow(backend_t *backend_data, int width, int height,
+                              const conv *kernel, double r, double g, double b, double a);
+
+void init_backend_base(struct backend_base *base, session_t *ps);
+
+struct conv **generate_blur_kernel(enum blur_method method, void *args, int *kernel_count);
+struct dual_kawase_params *generate_dual_kawase_params(void *args);
+
+void *default_clone_image(backend_t *base, const void *image_data, const region_t *reg);
+void *default_resize_image(backend_t *base, const void *image_data, uint16_t desired_width,
+			   uint16_t desired_height, const region_t *reg);
+bool default_is_image_transparent(backend_t *base attr_unused, void *image_data);
+bool default_set_image_property(backend_t *base attr_unused, enum image_properties op,
+                                void *image_data, void *arg);
+struct backend_image *default_new_backend_image(int w, int h);