swaybg: split into standalone project

The new upstream is https://github.com/swaywm/swaybg

This commit also refactors our use of gdk-pixbuf a bit, since the only
remaining reverse dependency is swaybar tray support.

2 files changed, 100 insertions, 99 deletions

diff --git a/common/background-image.c b/common/background-image.c
index 4431b725..de42e8e9 100644
--- a/common/background-image.c
+++ b/common/background-image.c
@@ -2,6 +2,9 @@
 #include "background-image.h"
 #include "cairo.h"
 #include "log.h"
+#if HAVE_GDK_PIXBUF
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#endif
 
 enum background_mode parse_background_mode(const char *mode) {
 	if (strcmp(mode, "stretch") == 0) {
@@ -21,6 +24,103 @@ enum background_mode parse_background_mode(const char *mode) {
 	return BACKGROUND_MODE_INVALID;
 }
 
+#if HAVE_GDK_PIXBUF
+static cairo_surface_t* gdk_cairo_image_surface_create_from_pixbuf(
+		const GdkPixbuf *gdkbuf) {
+	int chan = gdk_pixbuf_get_n_channels(gdkbuf);
+	if (chan < 3) {
+		return NULL;
+	}
+
+	const guint8* gdkpix = gdk_pixbuf_read_pixels(gdkbuf);
+	if (!gdkpix) {
+		return NULL;
+	}
+	gint w = gdk_pixbuf_get_width(gdkbuf);
+	gint h = gdk_pixbuf_get_height(gdkbuf);
+	int stride = gdk_pixbuf_get_rowstride(gdkbuf);
+
+	cairo_format_t fmt = (chan == 3) ? CAIRO_FORMAT_RGB24 : CAIRO_FORMAT_ARGB32;
+	cairo_surface_t * cs = cairo_image_surface_create (fmt, w, h);
+	cairo_surface_flush (cs);
+	if ( !cs || cairo_surface_status(cs) != CAIRO_STATUS_SUCCESS) {
+		return NULL;
+	}
+
+	int cstride = cairo_image_surface_get_stride(cs);
+	unsigned char * cpix = cairo_image_surface_get_data(cs);
+
+	if (chan == 3) {
+		int i;
+		for (i = h; i; --i) {
+			const guint8 *gp = gdkpix;
+			unsigned char *cp = cpix;
+			const guint8* end = gp + 3*w;
+			while (gp < end) {
+#if G_BYTE_ORDER == G_LITTLE_ENDIAN
+				cp[0] = gp[2];
+				cp[1] = gp[1];
+				cp[2] = gp[0];
+#else
+				cp[1] = gp[0];
+				cp[2] = gp[1];
+				cp[3] = gp[2];
+#endif
+				gp += 3;
+				cp += 4;
+			}
+			gdkpix += stride;
+			cpix += cstride;
+		}
+	} else {
+		/* premul-color = alpha/255 * color/255 * 255 = (alpha*color)/255
+		 * (z/255) = z/256 * 256/255     = z/256 (1 + 1/255)
+		 *         = z/256 + (z/256)/255 = (z + z/255)/256
+		 *         # recurse once
+		 *         = (z + (z + z/255)/256)/256
+		 *         = (z + z/256 + z/256/255) / 256
+		 *         # only use 16bit uint operations, loose some precision,
+		 *         # result is floored.
+		 *       ->  (z + z>>8)>>8
+		 *         # add 0x80/255 = 0.5 to convert floor to round
+		 *       =>  (z+0x80 + (z+0x80)>>8 ) >> 8
+		 * ------
+		 * tested as equal to lround(z/255.0) for uint z in [0..0xfe02]
+		 */
+#define PREMUL_ALPHA(x,a,b,z) \
+		G_STMT_START { z = a * b + 0x80; x = (z + (z >> 8)) >> 8; } \
+		G_STMT_END
+		int i;
+		for (i = h; i; --i) {
+			const guint8 *gp = gdkpix;
+			unsigned char *cp = cpix;
+			const guint8* end = gp + 4*w;
+			guint z1, z2, z3;
+			while (gp < end) {
+#if G_BYTE_ORDER == G_LITTLE_ENDIAN
+				PREMUL_ALPHA(cp[0], gp[2], gp[3], z1);
+				PREMUL_ALPHA(cp[1], gp[1], gp[3], z2);
+				PREMUL_ALPHA(cp[2], gp[0], gp[3], z3);
+				cp[3] = gp[3];
+#else
+				PREMUL_ALPHA(cp[1], gp[0], gp[3], z1);
+				PREMUL_ALPHA(cp[2], gp[1], gp[3], z2);
+				PREMUL_ALPHA(cp[3], gp[2], gp[3], z3);
+				cp[0] = gp[3];
+#endif
+				gp += 4;
+				cp += 4;
+			}
+			gdkpix += stride;
+			cpix += cstride;
+		}
+#undef PREMUL_ALPHA
+	}
+	cairo_surface_mark_dirty(cs);
+	return cs;
+}
+#endif // HAVE_GDK_PIXBUF
+
 cairo_surface_t *load_background_image(const char *path) {
 	cairo_surface_t *image;
 #if HAVE_GDK_PIXBUF
diff --git a/common/cairo.c b/common/cairo.c
index f2ad54c1..403dcf49 100644
--- a/common/cairo.c
+++ b/common/cairo.c
@@ -1,9 +1,6 @@
 #include <stdint.h>
 #include <cairo/cairo.h>
 #include "cairo.h"
-#if HAVE_GDK_PIXBUF
-#include <gdk-pixbuf/gdk-pixbuf.h>
-#endif
 
 void cairo_set_source_u32(cairo_t *cairo, uint32_t color) {
 	cairo_set_source_rgba(cairo,
@@ -45,99 +42,3 @@ cairo_surface_t *cairo_image_surface_scale(cairo_surface_t *image,
 	cairo_destroy(cairo);
 	return new;
 }
-
-#if HAVE_GDK_PIXBUF
-cairo_surface_t* gdk_cairo_image_surface_create_from_pixbuf(const GdkPixbuf *gdkbuf) {
-	int chan = gdk_pixbuf_get_n_channels(gdkbuf);
-	if (chan < 3) {
-		return NULL;
-	}
-
-	const guint8* gdkpix = gdk_pixbuf_read_pixels(gdkbuf);
-	if (!gdkpix) {
-		return NULL;
-	}
-	gint w = gdk_pixbuf_get_width(gdkbuf);
-	gint h = gdk_pixbuf_get_height(gdkbuf);
-	int stride = gdk_pixbuf_get_rowstride(gdkbuf);
-
-	cairo_format_t fmt = (chan == 3) ? CAIRO_FORMAT_RGB24 : CAIRO_FORMAT_ARGB32;
-	cairo_surface_t * cs = cairo_image_surface_create (fmt, w, h);
-	cairo_surface_flush (cs);
-	if ( !cs || cairo_surface_status(cs) != CAIRO_STATUS_SUCCESS) {
-		return NULL;
-	}
-
-	int cstride = cairo_image_surface_get_stride(cs);
-	unsigned char * cpix = cairo_image_surface_get_data(cs);
-
-	if (chan == 3) {
-		int i;
-		for (i = h; i; --i) {
-			const guint8 *gp = gdkpix;
-			unsigned char *cp = cpix;
-			const guint8* end = gp + 3*w;
-			while (gp < end) {
-#if G_BYTE_ORDER == G_LITTLE_ENDIAN
-				cp[0] = gp[2];
-				cp[1] = gp[1];
-				cp[2] = gp[0];
-#else
-				cp[1] = gp[0];
-				cp[2] = gp[1];
-				cp[3] = gp[2];
-#endif
-				gp += 3;
-				cp += 4;
-			}
-			gdkpix += stride;
-			cpix += cstride;
-		}
-	} else {
-		/* premul-color = alpha/255 * color/255 * 255 = (alpha*color)/255
-		 * (z/255) = z/256 * 256/255     = z/256 (1 + 1/255)
-		 *         = z/256 + (z/256)/255 = (z + z/255)/256
-		 *         # recurse once
-		 *         = (z + (z + z/255)/256)/256
-		 *         = (z + z/256 + z/256/255) / 256
-		 *         # only use 16bit uint operations, loose some precision,
-		 *         # result is floored.
-		 *       ->  (z + z>>8)>>8
-		 *         # add 0x80/255 = 0.5 to convert floor to round
-		 *       =>  (z+0x80 + (z+0x80)>>8 ) >> 8
-		 * ------
-		 * tested as equal to lround(z/255.0) for uint z in [0..0xfe02]
-		 */
-#define PREMUL_ALPHA(x,a,b,z) \
-		G_STMT_START { z = a * b + 0x80; x = (z + (z >> 8)) >> 8; } \
-		G_STMT_END
-		int i;
-		for (i = h; i; --i) {
-			const guint8 *gp = gdkpix;
-			unsigned char *cp = cpix;
-			const guint8* end = gp + 4*w;
-			guint z1, z2, z3;
-			while (gp < end) {
-#if G_BYTE_ORDER == G_LITTLE_ENDIAN
-				PREMUL_ALPHA(cp[0], gp[2], gp[3], z1);
-				PREMUL_ALPHA(cp[1], gp[1], gp[3], z2);
-				PREMUL_ALPHA(cp[2], gp[0], gp[3], z3);
-				cp[3] = gp[3];
-#else
-				PREMUL_ALPHA(cp[1], gp[0], gp[3], z1);
-				PREMUL_ALPHA(cp[2], gp[1], gp[3], z2);
-				PREMUL_ALPHA(cp[3], gp[2], gp[3], z3);
-				cp[0] = gp[3];
-#endif
-				gp += 4;
-				cp += 4;
-			}
-			gdkpix += stride;
-			cpix += cstride;
-		}
-#undef PREMUL_ALPHA
-	}
-	cairo_surface_mark_dirty(cs);
-	return cs;
-}
-#endif // HAVE_GDK_PIXBUF