mirror of
https://github.com/swaywm/sway.git
synced 2024-11-18 22:19:14 +00:00
d45623c2db
For full context, read https://gitlab.freedesktop.org/cairo/cairo/-/issues/479 TL;DR, cairo’s pc file adds `/cairo` to CFLAGS. So namespace cairo shouldn’t be used.
221 lines
6.3 KiB
C
221 lines
6.3 KiB
C
#include <assert.h>
|
|
#include "background-image.h"
|
|
#include "cairo_util.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) {
|
|
return BACKGROUND_MODE_STRETCH;
|
|
} else if (strcmp(mode, "fill") == 0) {
|
|
return BACKGROUND_MODE_FILL;
|
|
} else if (strcmp(mode, "fit") == 0) {
|
|
return BACKGROUND_MODE_FIT;
|
|
} else if (strcmp(mode, "center") == 0) {
|
|
return BACKGROUND_MODE_CENTER;
|
|
} else if (strcmp(mode, "tile") == 0) {
|
|
return BACKGROUND_MODE_TILE;
|
|
} else if (strcmp(mode, "solid_color") == 0) {
|
|
return BACKGROUND_MODE_SOLID_COLOR;
|
|
}
|
|
sway_log(SWAY_ERROR, "Unsupported background mode: %s", 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
|
|
GError *err = NULL;
|
|
GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file(path, &err);
|
|
if (!pixbuf) {
|
|
sway_log(SWAY_ERROR, "Failed to load background image (%s).",
|
|
err->message);
|
|
return NULL;
|
|
}
|
|
image = gdk_cairo_image_surface_create_from_pixbuf(pixbuf);
|
|
g_object_unref(pixbuf);
|
|
#else
|
|
image = cairo_image_surface_create_from_png(path);
|
|
#endif // HAVE_GDK_PIXBUF
|
|
if (!image) {
|
|
sway_log(SWAY_ERROR, "Failed to read background image.");
|
|
return NULL;
|
|
}
|
|
if (cairo_surface_status(image) != CAIRO_STATUS_SUCCESS) {
|
|
sway_log(SWAY_ERROR, "Failed to read background image: %s."
|
|
#if !HAVE_GDK_PIXBUF
|
|
"\nSway was compiled without gdk_pixbuf support, so only"
|
|
"\nPNG images can be loaded. This is the likely cause."
|
|
#endif // !HAVE_GDK_PIXBUF
|
|
, cairo_status_to_string(cairo_surface_status(image)));
|
|
return NULL;
|
|
}
|
|
return image;
|
|
}
|
|
|
|
void render_background_image(cairo_t *cairo, cairo_surface_t *image,
|
|
enum background_mode mode, int buffer_width, int buffer_height) {
|
|
double width = cairo_image_surface_get_width(image);
|
|
double height = cairo_image_surface_get_height(image);
|
|
|
|
cairo_save(cairo);
|
|
switch (mode) {
|
|
case BACKGROUND_MODE_STRETCH:
|
|
cairo_scale(cairo,
|
|
(double)buffer_width / width,
|
|
(double)buffer_height / height);
|
|
cairo_set_source_surface(cairo, image, 0, 0);
|
|
break;
|
|
case BACKGROUND_MODE_FILL: {
|
|
double window_ratio = (double)buffer_width / buffer_height;
|
|
double bg_ratio = width / height;
|
|
|
|
if (window_ratio > bg_ratio) {
|
|
double scale = (double)buffer_width / width;
|
|
cairo_scale(cairo, scale, scale);
|
|
cairo_set_source_surface(cairo, image,
|
|
0, (double)buffer_height / 2 / scale - height / 2);
|
|
} else {
|
|
double scale = (double)buffer_height / height;
|
|
cairo_scale(cairo, scale, scale);
|
|
cairo_set_source_surface(cairo, image,
|
|
(double)buffer_width / 2 / scale - width / 2, 0);
|
|
}
|
|
break;
|
|
}
|
|
case BACKGROUND_MODE_FIT: {
|
|
double window_ratio = (double)buffer_width / buffer_height;
|
|
double bg_ratio = width / height;
|
|
|
|
if (window_ratio > bg_ratio) {
|
|
double scale = (double)buffer_height / height;
|
|
cairo_scale(cairo, scale, scale);
|
|
cairo_set_source_surface(cairo, image,
|
|
(double)buffer_width / 2 / scale - width / 2, 0);
|
|
} else {
|
|
double scale = (double)buffer_width / width;
|
|
cairo_scale(cairo, scale, scale);
|
|
cairo_set_source_surface(cairo, image,
|
|
0, (double)buffer_height / 2 / scale - height / 2);
|
|
}
|
|
break;
|
|
}
|
|
case BACKGROUND_MODE_CENTER:
|
|
cairo_set_source_surface(cairo, image,
|
|
(double)buffer_width / 2 - width / 2,
|
|
(double)buffer_height / 2 - height / 2);
|
|
break;
|
|
case BACKGROUND_MODE_TILE: {
|
|
cairo_pattern_t *pattern = cairo_pattern_create_for_surface(image);
|
|
cairo_pattern_set_extend(pattern, CAIRO_EXTEND_REPEAT);
|
|
cairo_set_source(cairo, pattern);
|
|
break;
|
|
}
|
|
case BACKGROUND_MODE_SOLID_COLOR:
|
|
case BACKGROUND_MODE_INVALID:
|
|
assert(0);
|
|
break;
|
|
}
|
|
cairo_paint(cairo);
|
|
cairo_restore(cairo);
|
|
}
|