diff options
Diffstat (limited to 'common/background-image.c')
| -rw-r--r-- | common/background-image.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/common/background-image.c b/common/background-image.c new file mode 100644 index 00000000..e5fb4433 --- /dev/null +++ b/common/background-image.c @@ -0,0 +1,119 @@ +#include <assert.h> +#include <stdbool.h> +#include <wlr/util/log.h> +#include "background-image.h" +#include "cairo.h" + +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; + } + wlr_log(L_ERROR, "Unsupported background mode: %s", mode); + return BACKGROUND_MODE_INVALID; +} + +cairo_surface_t *load_background_image(const char *path) { + cairo_surface_t *image; +#ifdef HAVE_GDK_PIXBUF + GError *err = NULL; + GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file(path, &err); + if (!pixbuf) { + wlr_log(L_ERROR, "Failed to load background image (%s).", + err->message); + return false; + } + 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) { + wlr_log(L_ERROR, "Failed to read background image."); + return NULL; + } + if (cairo_surface_status(image) != CAIRO_STATUS_SUCCESS) { + wlr_log(L_ERROR, "Failed to read background image: %s." +#ifndef 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); + + 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); +} |