libdecor: update from source git repo (commit e87dcfda)

This brings the GTK plugin inside the master libdecor git repo.

2 files changed, 265 insertions, 0 deletions

diff --git a/libdecor/src/plugins/common/libdecor-cairo-blur.c b/libdecor/src/plugins/common/libdecor-cairo-blur.c
new file mode 100644
index 000000000..2cddc7a23
--- /dev/null
+++ b/libdecor/src/plugins/common/libdecor-cairo-blur.c
@@ -0,0 +1,255 @@
+/*
+ * Copyright © 2008 Kristian Høgsberg
+ * Copyright © 2012 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial
+ * portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+/*
+ * functions 'blur_surface' and 'render_shadow' from weston project:
+ * https://gitlab.freedesktop.org/wayland/weston/raw/master/shared/cairo-util.c
+ */
+
+#include "libdecor-cairo-blur.h"
+#include <stdint.h>
+#include <stdlib.h>
+#include <math.h>
+
+/**
+ * Compile-time computation of number of items in a hardcoded array.
+ *
+ * @param a the array being measured.
+ * @return the number of items hardcoded into the array.
+ */
+#ifndef ARRAY_LENGTH
+#define ARRAY_LENGTH(a) (sizeof (a) / sizeof (a)[0])
+#endif
+
+int
+blur_surface(cairo_surface_t *surface, int margin)
+{
+	int32_t width, height, stride, x, y, z, w;
+	uint8_t *src, *dst;
+	uint32_t *s, *d, a, p;
+	int i, j, k, size, half;
+	uint32_t kernel[71];
+	double f;
+
+	size = ARRAY_LENGTH(kernel);
+	width = cairo_image_surface_get_width(surface);
+	height = cairo_image_surface_get_height(surface);
+	stride = cairo_image_surface_get_stride(surface);
+	src = cairo_image_surface_get_data(surface);
+
+	dst = malloc(height * stride);
+	if (dst == NULL)
+		return -1;
+
+	half = size / 2;
+	a = 0;
+	for (i = 0; i < size; i++) {
+		f = (i - half);
+		kernel[i] = exp(- f * f / ARRAY_LENGTH(kernel)) * 10000;
+		a += kernel[i];
+	}
+
+	for (i = 0; i < height; i++) {
+		s = (uint32_t *) (src + i * stride);
+		d = (uint32_t *) (dst + i * stride);
+		for (j = 0; j < width; j++) {
+			if (margin < j && j < width - margin) {
+				d[j] = s[j];
+				continue;
+			}
+
+			x = 0;
+			y = 0;
+			z = 0;
+			w = 0;
+			for (k = 0; k < size; k++) {
+				if (j - half + k < 0 || j - half + k >= width)
+					continue;
+				p = s[j - half + k];
+
+				x += (p >> 24) * kernel[k];
+				y += ((p >> 16) & 0xff) * kernel[k];
+				z += ((p >> 8) & 0xff) * kernel[k];
+				w += (p & 0xff) * kernel[k];
+			}
+			d[j] = (x / a << 24) | (y / a << 16) | (z / a << 8) | w / a;
+		}
+	}
+
+	for (i = 0; i < height; i++) {
+		s = (uint32_t *) (dst + i * stride);
+		d = (uint32_t *) (src + i * stride);
+		for (j = 0; j < width; j++) {
+			if (margin <= i && i < height - margin) {
+				d[j] = s[j];
+				continue;
+			}
+
+			x = 0;
+			y = 0;
+			z = 0;
+			w = 0;
+			for (k = 0; k < size; k++) {
+				if (i - half + k < 0 || i - half + k >= height)
+					continue;
+				s = (uint32_t *) (dst + (i - half + k) * stride);
+				p = s[j];
+
+				x += (p >> 24) * kernel[k];
+				y += ((p >> 16) & 0xff) * kernel[k];
+				z += ((p >> 8) & 0xff) * kernel[k];
+				w += (p & 0xff) * kernel[k];
+			}
+			d[j] = (x / a << 24) | (y / a << 16) | (z / a << 8) | w / a;
+		}
+	}
+
+	free(dst);
+	cairo_surface_mark_dirty(surface);
+
+	return 0;
+}
+
+void
+render_shadow(cairo_t *cr, cairo_surface_t *surface,
+	      int x, int y, int width, int height, int margin, int top_margin)
+{
+	cairo_pattern_t *pattern;
+	cairo_matrix_t matrix;
+	int i, fx, fy, shadow_height, shadow_width;
+
+	cairo_set_source_rgba(cr, 0, 0, 0, 0.45);
+	cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
+	pattern = cairo_pattern_create_for_surface (surface);
+	cairo_pattern_set_filter(pattern, CAIRO_FILTER_NEAREST);
+
+	for (i = 0; i < 4; i++) {
+		/* when fy is set, then we are working with lower corners,
+		 * when fx is set, then we are working with right corners
+		 *
+		 *  00 ------- 01
+		 *   |         |
+		 *   |         |
+		 *  10 ------- 11
+		 */
+		fx = i & 1;
+		fy = i >> 1;
+
+		cairo_matrix_init_translate(&matrix,
+					    -x + fx * (128 - width),
+					    -y + fy * (128 - height));
+		cairo_pattern_set_matrix(pattern, &matrix);
+
+		shadow_width = margin;
+		shadow_height = fy ? margin : top_margin;
+
+		/* if the shadows together are greater than the surface, we need
+		 * to fix it - set the shadow size to the half of
+		 * the size of surface. Also handle the case when the size is
+		 * not divisible by 2. In that case we need one part of the
+		 * shadow to be one pixel greater. !fy or !fx, respectively,
+		 * will do the work.
+		 */
+		if (height < 2 * shadow_height)
+			shadow_height = (height + !fy) / 2;
+
+		if (width < 2 * shadow_width)
+			shadow_width = (width + !fx) / 2;
+
+		cairo_reset_clip(cr);
+		cairo_rectangle(cr,
+				x + fx * (width - shadow_width),
+				y + fy * (height - shadow_height),
+				shadow_width, shadow_height);
+		cairo_clip (cr);
+		cairo_mask(cr, pattern);
+	}
+
+
+	shadow_width = width - 2 * margin;
+	shadow_height = top_margin;
+	if (height < 2 * shadow_height)
+		shadow_height = height / 2;
+
+	if (shadow_width > 0 && shadow_height) {
+		/* Top stretch */
+		cairo_matrix_init_translate(&matrix, 60, 0);
+		cairo_matrix_scale(&matrix, 8.0 / width, 1);
+		cairo_matrix_translate(&matrix, -x - width / 2, -y);
+		cairo_pattern_set_matrix(pattern, &matrix);
+		cairo_rectangle(cr, x + margin, y, shadow_width, shadow_height);
+
+		cairo_reset_clip(cr);
+		cairo_rectangle(cr,
+				x + margin, y,
+				shadow_width, shadow_height);
+		cairo_clip (cr);
+		cairo_mask(cr, pattern);
+
+		/* Bottom stretch */
+		cairo_matrix_translate(&matrix, 0, -height + 128);
+		cairo_pattern_set_matrix(pattern, &matrix);
+
+		cairo_reset_clip(cr);
+		cairo_rectangle(cr, x + margin, y + height - margin,
+				shadow_width, margin);
+		cairo_clip (cr);
+		cairo_mask(cr, pattern);
+	}
+
+	shadow_width = margin;
+	if (width < 2 * shadow_width)
+		shadow_width = width / 2;
+
+	shadow_height = height - margin - top_margin;
+
+	/* if height is smaller than sum of margins,
+	 * then the shadow is already done by the corners */
+	if (shadow_height > 0 && shadow_width) {
+		/* Left stretch */
+		cairo_matrix_init_translate(&matrix, 0, 60);
+		cairo_matrix_scale(&matrix, 1, 8.0 / height);
+		cairo_matrix_translate(&matrix, -x, -y - height / 2);
+		cairo_pattern_set_matrix(pattern, &matrix);
+		cairo_reset_clip(cr);
+		cairo_rectangle(cr, x, y + top_margin,
+				shadow_width, shadow_height);
+		cairo_clip (cr);
+		cairo_mask(cr, pattern);
+
+		/* Right stretch */
+		cairo_matrix_translate(&matrix, -width + 128, 0);
+		cairo_pattern_set_matrix(pattern, &matrix);
+		cairo_rectangle(cr, x + width - shadow_width, y + top_margin,
+				shadow_width, shadow_height);
+		cairo_reset_clip(cr);
+		cairo_clip (cr);
+		cairo_mask(cr, pattern);
+	}
+
+	cairo_pattern_destroy(pattern);
+	cairo_reset_clip(cr);
+}
diff --git a/libdecor/src/plugins/common/libdecor-cairo-blur.h b/libdecor/src/plugins/common/libdecor-cairo-blur.h
new file mode 100644
index 000000000..d48e9dd3d
--- /dev/null
+++ b/libdecor/src/plugins/common/libdecor-cairo-blur.h
@@ -0,0 +1,10 @@
+#pragma once
+
+#include <cairo/cairo.h>
+
+int
+blur_surface(cairo_surface_t *surface, int margin);
+
+void
+render_shadow(cairo_t *cr, cairo_surface_t *surface,
+	      int x, int y, int width, int height, int margin, int top_margin);