mirror of https://github.com/swaywm/sway.git
101 lines
3.0 KiB
C
101 lines
3.0 KiB
C
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#include <assert.h>
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#include <stdbool.h>
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#include <wlr/util/log.h>
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#include "background-image.h"
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#include "cairo.h"
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cairo_surface_t *load_background_image(const char *path) {
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cairo_surface_t *image;
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#ifdef HAVE_GDK_PIXBUF
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GError *err = NULL;
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GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file(path, &err);
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if (!pixbuf) {
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wlr_log(L_ERROR, "Failed to load background image.");
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return false;
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}
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image = gdk_cairo_image_surface_create_from_pixbuf(pixbuf);
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g_object_unref(pixbuf);
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#else
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image = cairo_image_surface_create_from_png(path);
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#endif //HAVE_GDK_PIXBUF
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if (!image) {
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wlr_log(L_ERROR, "Failed to read background image.");
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return NULL;
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}
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if (cairo_surface_status(image) != CAIRO_STATUS_SUCCESS) {
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wlr_log(L_ERROR, "Failed to read background image: %s."
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#ifndef HAVE_GDK_PIXBUF
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"\nSway was compiled without gdk_pixbuf support, so only"
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"\nPNG images can be loaded. This is the likely cause."
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#endif //HAVE_GDK_PIXBUF
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, cairo_status_to_string(cairo_surface_status(image)));
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return NULL;
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}
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return image;
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}
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void render_background_image(cairo_t *cairo, cairo_surface_t *image,
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enum background_mode mode, int buffer_width, int buffer_height,
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int buffer_scale) {
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double width = cairo_image_surface_get_width(image);
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double height = cairo_image_surface_get_height(image);
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switch (mode) {
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case BACKGROUND_MODE_STRETCH:
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cairo_scale(cairo,
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(double)buffer_width / width,
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(double)buffer_height / height);
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cairo_set_source_surface(cairo, image, 0, 0);
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break;
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case BACKGROUND_MODE_FILL: {
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double window_ratio = (double)buffer_width / buffer_height;
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double bg_ratio = width / height;
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if (window_ratio > bg_ratio) {
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double scale = (double)buffer_width / width;
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cairo_scale(cairo, scale, scale);
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cairo_set_source_surface(cairo, image,
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0, (double)buffer_height / 2 / scale - height / 2);
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} else {
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double scale = (double)buffer_height / height;
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cairo_scale(cairo, scale, scale);
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cairo_set_source_surface(cairo, image,
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(double)buffer_width / 2 / scale - width / 2, 0);
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}
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break;
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}
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case BACKGROUND_MODE_FIT: {
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double window_ratio = (double)buffer_width / buffer_height;
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double bg_ratio = width / height;
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if (window_ratio > bg_ratio) {
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double scale = (double)buffer_height / height;
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cairo_scale(cairo, scale, scale);
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cairo_set_source_surface(cairo, image,
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(double)buffer_width / 2 / scale - width / 2, 0);
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} else {
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double scale = (double)buffer_width / width;
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cairo_scale(cairo, scale, scale);
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cairo_set_source_surface(cairo, image,
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0, (double)buffer_height / 2 / scale - height / 2);
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}
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break;
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}
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case BACKGROUND_MODE_CENTER:
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cairo_set_source_surface(cairo, image,
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(double)buffer_width / 2 - width / 2,
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(double)buffer_height / 2 - height / 2);
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break;
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case BACKGROUND_MODE_TILE: {
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cairo_pattern_t *pattern = cairo_pattern_create_for_surface(image);
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cairo_pattern_set_extend(pattern, CAIRO_EXTEND_REPEAT);
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cairo_set_source(cairo, pattern);
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break;
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}
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case BACKGROUND_MODE_SOLID_COLOR:
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assert(0);
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break;
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}
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cairo_paint(cairo);
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}
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