From 632bb948b7ffbb08a6e965dabf88347afd0a1fa8 Mon Sep 17 00:00:00 2001
From: Drew DeVault <sir@cmpwn.com>
Date: Tue, 27 Mar 2018 15:25:25 -0400
Subject: Add solid-color rendering to swaybg
---
common/cairo.c | 127 +++++++++++++++++++++++++++++++++++++++++++++++++++++
common/meson.build | 21 ++++++---
2 files changed, 143 insertions(+), 5 deletions(-)
create mode 100644 common/cairo.c
(limited to 'common')
diff --git a/common/cairo.c b/common/cairo.c
new file mode 100644
index 00000000..c6bd0da9
--- /dev/null
+++ b/common/cairo.c
@@ -0,0 +1,127 @@
+#include <stdint.h>
+#include <cairo/cairo.h>
+#include "cairo.h"
+#ifdef WITH_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,
+ (color >> (3*8) & 0xFF) / 255.0,
+ (color >> (2*8) & 0xFF) / 255.0,
+ (color >> (1*8) & 0xFF) / 255.0,
+ (color >> (0*8) & 0xFF) / 255.0);
+}
+
+cairo_surface_t *cairo_image_surface_scale(cairo_surface_t *image,
+ int width, int height) {
+ int image_width = cairo_image_surface_get_width(image);
+ int image_height = cairo_image_surface_get_height(image);
+
+ cairo_surface_t *new =
+ cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
+ cairo_t *cairo = cairo_create(new);
+ cairo_scale(cairo, (double)width / image_width,
+ (double)height / image_height);
+ cairo_set_source_surface(cairo, image, 0, 0);
+
+ cairo_paint(cairo);
+ cairo_destroy(cairo);
+ return new;
+}
+
+#ifdef WITH_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 //WITH_GDK_PIXBUF
diff --git a/common/meson.build b/common/meson.build
index abe0cdcf..01736ca6 100644
--- a/common/meson.build
+++ b/common/meson.build
@@ -1,12 +1,23 @@
-lib_sway_common = static_library('sway-common',
+deps = [
+ cairo,
+ wlroots
+]
+
+if gdk_pixbuf.found()
+ deps += [gdk_pixbuf]
+endif
+
+lib_sway_common = static_library(
+ 'sway-common',
files(
+ 'cairo.c',
+ 'ipc-client.c',
'log.c',
'list.c',
- 'util.c',
- 'stringop.c',
'readline.c',
- 'ipc-client.c'
+ 'stringop.c',
+ 'util.c'
),
- dependencies: [ wlroots ],
+ dependencies: deps,
include_directories: sway_inc
)
--
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