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Introduce sway_text_node

Browse Source 
This is a helper on top of a wlr_scene_buffer that will handle text
rendering for us.
master
Alexander Orzechowski 1 year ago committed by Kirill Primak
parent 869baff252
commit 946fc80945
3 changed files with 332 additions and 0 deletions
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28
include/sway/sway_text_node.h
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@ -0,0 +1,28 @@
#ifndef _SWAY_BUFFER_H
#define _SWAY_BUFFER_H
#include <wlr/types/wlr_scene.h>
struct sway_text_node {
int width;
int max_width;
int height;
int baseline;
bool pango_markup;
float color[4];
float background[4];
struct wlr_scene_node *node;
};
struct sway_text_node *sway_text_node_create(struct wlr_scene_tree *parent,
char *text, float color[4], bool pango_markup);
void sway_text_node_set_color(struct sway_text_node *node, float color[4]);
void sway_text_node_set_text(struct sway_text_node *node, char *text);
void sway_text_node_set_max_width(struct sway_text_node *node, int max_width);
void sway_text_node_set_background(struct sway_text_node *node, float background[4]);
#endif

1
sway/meson.build
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@ -10,6 +10,7 @@ sway_sources = files(
'realtime.c', 'realtime.c',
'scene_descriptor.c', 'scene_descriptor.c',
'server.c', 'server.c',
'sway_text_node.c',
'swaynag.c', 'swaynag.c',
'xdg_activation_v1.c', 'xdg_activation_v1.c',
'xdg_decoration.c', 'xdg_decoration.c',

303
sway/sway_text_node.c
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@ -0,0 +1,303 @@
#define _POSIX_C_SOURCE 200809L
#include <drm_fourcc.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wlr/types/wlr_buffer.h>
#include <wlr/interfaces/wlr_buffer.h>
#include "cairo_util.h"
#include "log.h"
#include "pango.h"
#include "sway/config.h"
#include "sway/sway_text_node.h"
struct cairo_buffer {
struct wlr_buffer base;
cairo_surface_t *surface;
cairo_t *cairo;
};
static void cairo_buffer_handle_destroy(struct wlr_buffer *wlr_buffer) {
struct cairo_buffer *buffer = wl_container_of(wlr_buffer, buffer, base);
cairo_surface_destroy(buffer->surface);
cairo_destroy(buffer->cairo);
free(buffer);
}
static bool cairo_buffer_handle_begin_data_ptr_access(struct wlr_buffer *wlr_buffer,
uint32_t flags, void **data, uint32_t *format, size_t *stride) {
struct cairo_buffer *buffer = wl_container_of(wlr_buffer, buffer, base);
*data = cairo_image_surface_get_data(buffer->surface);
*stride = cairo_image_surface_get_stride(buffer->surface);
*format = DRM_FORMAT_ARGB8888;
return true;
}
static void cairo_buffer_handle_end_data_ptr_access(struct wlr_buffer *wlr_buffer) {
// This space is intentionally left blank
}
static const struct wlr_buffer_impl cairo_buffer_impl = {
.destroy = cairo_buffer_handle_destroy,
.begin_data_ptr_access = cairo_buffer_handle_begin_data_ptr_access,
.end_data_ptr_access = cairo_buffer_handle_end_data_ptr_access,
};
struct text_buffer {
struct wlr_scene_buffer *buffer_node;
char *text;
struct sway_text_node props;
bool visible;
float scale;
enum wl_output_subpixel subpixel;
struct wl_listener outputs_update;
struct wl_listener destroy;
};
static int get_text_width(struct sway_text_node *props) {
if (props->max_width) {
return MIN(props->max_width, props->width);
}
return props->width;
}
static void update_source_box(struct text_buffer *buffer) {
struct sway_text_node *props = &buffer->props;
struct wlr_fbox source_box = {
.x = 0,
.y = 0,
.width = ceil(get_text_width(props) * buffer->scale),
.height = ceil(props->height * buffer->scale),
};
wlr_scene_buffer_set_source_box(buffer->buffer_node, &source_box);
}
static void render_backing_buffer(struct text_buffer *buffer) {
if (!buffer->visible) {
return;
}
float scale = buffer->scale;
int width = ceil(buffer->props.width * scale);
int height = ceil(buffer->props.height * scale);
float *color = (float *)&buffer->props.color;
float *background = (float *)&buffer->props.background;
PangoContext *pango = NULL;
cairo_font_options_t *fo = cairo_font_options_create();
cairo_font_options_set_hint_style(fo, CAIRO_HINT_STYLE_FULL);
enum wl_output_subpixel subpixel = buffer->subpixel;
if (subpixel == WL_OUTPUT_SUBPIXEL_NONE || subpixel == WL_OUTPUT_SUBPIXEL_UNKNOWN) {
cairo_font_options_set_antialias(fo, CAIRO_ANTIALIAS_GRAY);
} else {
cairo_font_options_set_antialias(fo, CAIRO_ANTIALIAS_SUBPIXEL);
cairo_font_options_set_subpixel_order(fo, to_cairo_subpixel_order(subpixel));
}
cairo_surface_t *surface = cairo_image_surface_create(
CAIRO_FORMAT_ARGB32, width, height);
cairo_status_t status = cairo_surface_status(surface);
if (status != CAIRO_STATUS_SUCCESS) {
sway_log(SWAY_ERROR, "cairo_image_surface_create failed: %s",
cairo_status_to_string(status));
goto err;
}
struct cairo_buffer *cairo_buffer = calloc(1, sizeof(*cairo_buffer));
if (!cairo_buffer) {
sway_log(SWAY_ERROR, "cairo_buffer allocation failed");
goto err;
}
cairo_t *cairo = cairo_create(surface);
if (!cairo) {
sway_log(SWAY_ERROR, "cairo_create failed");
free(cairo_buffer);
goto err;
}
cairo_set_antialias(cairo, CAIRO_ANTIALIAS_BEST);
cairo_set_font_options(cairo, fo);
pango = pango_cairo_create_context(cairo);
cairo_set_source_rgba(cairo, background[0], background[1], background[2], background[3]);
cairo_rectangle(cairo, 0, 0, width, height);
cairo_fill(cairo);
cairo_set_source_rgba(cairo, color[0], color[1], color[2], color[3]);
cairo_move_to(cairo, 0, (config->font_baseline - buffer->props.baseline) * scale);
render_text(cairo, config->font_description, scale, buffer->props.pango_markup,
"%s", buffer->text);
cairo_surface_flush(surface);
wlr_buffer_init(&cairo_buffer->base, &cairo_buffer_impl, width, height);
cairo_buffer->surface = surface;
cairo_buffer->cairo = cairo;
wlr_scene_buffer_set_buffer(buffer->buffer_node, &cairo_buffer->base);
wlr_buffer_drop(&cairo_buffer->base);
update_source_box(buffer);
pixman_region32_t opaque;
pixman_region32_init(&opaque);
if (background[3] == 1) {
pixman_region32_union_rect(&opaque, &opaque, 0, 0,
buffer->props.width, buffer->props.height);
}
wlr_scene_buffer_set_opaque_region(buffer->buffer_node, &opaque);
pixman_region32_fini(&opaque);
err:
if (pango) g_object_unref(pango);
cairo_font_options_destroy(fo);
}
static void handle_outputs_update(struct wl_listener *listener, void *data) {
struct text_buffer *buffer = wl_container_of(listener, buffer, outputs_update);
struct wlr_scene_outputs_update_event *event = data;
float scale = 0;
enum wl_output_subpixel subpixel = WL_OUTPUT_SUBPIXEL_UNKNOWN;
for (size_t i = 0; i < event->size; i++) {
struct wlr_scene_output *output = event->active[i];
if (subpixel == WL_OUTPUT_SUBPIXEL_UNKNOWN) {
subpixel = output->output->subpixel;
} else if (subpixel != output->output->subpixel) {
subpixel = WL_OUTPUT_SUBPIXEL_NONE;
}
if (scale != 0 && scale != output->output->scale) {
// drop down to gray scale if we encounter outputs with different
// scales or else we will have chromatic aberations
subpixel = WL_OUTPUT_SUBPIXEL_NONE;
}
if (scale < output->output->scale) {
scale = output->output->scale;
}
}
buffer->visible = event->size > 0;
if (scale != buffer->scale || subpixel != buffer->subpixel) {
buffer->scale = scale;
buffer->subpixel = subpixel;
render_backing_buffer(buffer);
}
}
static void handle_destroy(struct wl_listener *listener, void *data) {
struct text_buffer *buffer = wl_container_of(listener, buffer, destroy);
wl_list_remove(&buffer->outputs_update.link);
wl_list_remove(&buffer->destroy.link);
free(buffer->text);
free(buffer);
}
static void text_calc_size(struct text_buffer *buffer) {
struct sway_text_node *props = &buffer->props;
cairo_t *c = cairo_create(NULL);
if (!c) {
sway_log(SWAY_ERROR, "cairo_t allocation failed");
return;
}
cairo_set_antialias(c, CAIRO_ANTIALIAS_BEST);
get_text_size(c, config->font_description, &props->width, NULL,
&props->baseline, 1, props->pango_markup, "%s", buffer->text);
cairo_destroy(c);
wlr_scene_buffer_set_dest_size(buffer->buffer_node,
get_text_width(props), props->height);
}
struct sway_text_node *sway_text_node_create(struct wlr_scene_tree *parent,
char *text, float color[4], bool pango_markup) {
struct text_buffer *buffer = calloc(1, sizeof(*buffer));
if (!buffer) {
return NULL;
}
struct wlr_scene_buffer *node = wlr_scene_buffer_create(parent, NULL);
if (!node) {
free(buffer);
return NULL;
}
buffer->buffer_node = node;
buffer->props.node = &node->node;
buffer->text = strdup(text);
if (!buffer->text) {
free(buffer);
wlr_scene_node_destroy(&node->node);
return NULL;
}
buffer->props.height = config->font_height;
buffer->props.pango_markup = pango_markup;
memcpy(&buffer->props.color, color, sizeof(*color) * 4);
buffer->destroy.notify = handle_destroy;
wl_signal_add(&node->node.events.destroy, &buffer->destroy);
buffer->outputs_update.notify = handle_outputs_update;
wl_signal_add(&node->events.outputs_update, &buffer->outputs_update);
text_calc_size(buffer);
return &buffer->props;
}
void sway_text_node_set_color(struct sway_text_node *node, float color[4]) {
if (memcmp(&node->color, color, sizeof(*color) * 4) == 0) {
return;
}
memcpy(&node->color, color, sizeof(*color) * 4);
struct text_buffer *buffer = wl_container_of(node, buffer, props);
render_backing_buffer(buffer);
}
void sway_text_node_set_text(struct sway_text_node *node, char *text) {
struct text_buffer *buffer = wl_container_of(node, buffer, props);
if (strcmp(buffer->text, text) == 0) {
return;
}
char *new_text = strdup(text);
if (!new_text) {
return;
}
free(buffer->text);
buffer->text = new_text;
text_calc_size(buffer);
render_backing_buffer(buffer);
}
void sway_text_node_set_max_width(struct sway_text_node *node, int max_width) {
struct text_buffer *buffer = wl_container_of(node, buffer, props);
buffer->props.max_width = max_width;
wlr_scene_buffer_set_dest_size(buffer->buffer_node,
get_text_width(&buffer->props), buffer->props.height);
update_source_box(buffer);
render_backing_buffer(buffer);
}
void sway_text_node_set_background(struct sway_text_node *node, float background[4]) {
struct text_buffer *buffer = wl_container_of(node, buffer, props);
memcpy(&node->background, background, sizeof(*background) * 4);
render_backing_buffer(buffer);
}
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