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authorAki <please@ignore.pl>2021-08-31 20:35:33 +0200
committerAki <please@ignore.pl>2021-08-31 21:57:52 +0200
commit266f20e8f0b688ba075ee0f5e81cfd9e4b0af18a (patch)
treed3ec4d1fd23c3d95680d07aaff526aadb8a23545
parent74a89676841f37d83c1ec02c9813fec95d773c55 (diff)
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Changed render target to a basic X window
-rw-r--r--Makefile4
-rw-r--r--text.c79
2 files changed, 63 insertions, 20 deletions
diff --git a/Makefile b/Makefile
index b27a35c..d48d49c 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
CFLAGS += -Wall -Wextra -Wpedantic
-CFLAGS += `pkg-config --cflags cairo pango pangocairo`
-LDLIBS += -lm `pkg-config --libs cairo pango pangocairo`
+CFLAGS += `pkg-config --cflags cairo pango pangocairo xcb xcb-util`
+LDLIBS += -lm `pkg-config --libs cairo pango pangocairo xcb xcb-util`
all: text
diff --git a/text.c b/text.c
index 1e488a5..f0bd074 100644
--- a/text.c
+++ b/text.c
@@ -1,12 +1,16 @@
-#include <math.h>
+#include <stdint.h>
#include <stdio.h>
#include <cairo.h>
+#include <cairo-xcb.h>
#include <glib-object.h>
#include <pango/pango.h>
#include <pango/pangocairo.h>
+#include <xcb/xcb.h>
+#include <xcb/xcb_util.h>
void draw_text(cairo_t *, const char *);
+xcb_visualtype_t * find_visual(xcb_screen_t *);
static const int MARGIN = 20;
static const int WIDTH = 800;
@@ -16,36 +20,75 @@ static const char * FONT = "Serif 34";
int main(int argc, const char ** argv)
{
- if (1 >= argc)
+ const char * text = "Lorem ipsum dolor sit amet, consectetur adipiscing elit.";
+ if (2 == argc)
+ text = argv[2];
+ xcb_connection_t * c = xcb_connect(NULL, NULL);
+ if (xcb_connection_has_error(c))
{
- dprintf(2, "Usage: %s OUTPUT [TEXT]\n", argv[0]);
+ dprintf(2, "Could not connect to X11 server");
return 1;
}
- const char * filename = argv[1];
- const char * text = "Lorem ipsum dolor sit amet, consectetur adipiscing elit.";
- if (3 == argc)
- text = argv[2];
- cairo_surface_t * surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, WIDTH, HEIGHT);
+ xcb_screen_t * s = xcb_setup_roots_iterator(xcb_get_setup(c)).data;
+ xcb_window_t w = xcb_generate_id(c);
+ const uint32_t mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK;
+ const uint32_t values[] = {s->white_pixel, XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_KEY_PRESS};
+ xcb_visualtype_t * visual = find_visual(s);
+ xcb_create_window(
+ c, XCB_COPY_FROM_PARENT, w, s->root, 0, 0, WIDTH, HEIGHT, 0, XCB_WINDOW_CLASS_INPUT_OUTPUT,
+ s->root_visual, mask, values);
+ xcb_map_window(c, w);
+ cairo_surface_t * surface = cairo_xcb_surface_create(c, w, visual, WIDTH, HEIGHT);
cairo_t * ctx = cairo_create(surface);
- cairo_scale(ctx, 1, 1);
- cairo_set_source_rgb(ctx, 1., 1., 1.);
- cairo_paint(ctx);
- cairo_set_source_rgb(ctx, 0., 0., 0.);
- draw_text(ctx, text);
+ xcb_flush(c);
+ int done = 0;
+ xcb_generic_event_t * e;
+ while (!done)
+ {
+ e = xcb_wait_for_event(c);
+ if (NULL == e)
+ break;
+ switch (XCB_EVENT_RESPONSE_TYPE(e))
+ {
+ default:
+ break;
+ case XCB_KEY_PRESS:
+ done = 1;
+ break;
+ case XCB_EXPOSE:
+ cairo_set_source_rgb(ctx, 1., 1., 1.);
+ cairo_paint(ctx);
+ cairo_set_source_rgb(ctx, 0., 0., 0.);
+ draw_text(ctx, text);
+ cairo_surface_flush(surface);
+ xcb_flush(c);
+ break;
+ }
+ free(e);
+ }
cairo_destroy(ctx);
- cairo_status_t status = cairo_surface_write_to_png(surface, filename);
cairo_surface_destroy(surface);
- if (CAIRO_STATUS_SUCCESS != status)
+ xcb_disconnect(c);
+}
+
+
+xcb_visualtype_t * find_visual(xcb_screen_t * s)
+{
+ xcb_depth_iterator_t d = xcb_screen_allowed_depths_iterator(s);
+ for (; d.rem; xcb_depth_next(&d))
{
- dprintf(2, "Could not save output to %s\n", filename);
- return 1;
+ xcb_visualtype_iterator_t v = xcb_depth_visuals_iterator(d.data);
+ for (; v.rem; xcb_visualtype_next(&v))
+ if (v.data->visual_id == s->root_visual)
+ return v.data;
}
+ return NULL;
}
void draw_text(cairo_t * ctx, const char * text)
{
- cairo_translate(ctx, MARGIN, MARGIN);
+ cairo_move_to(ctx, MARGIN, MARGIN);
PangoLayout * layout = pango_cairo_create_layout(ctx);
PangoFontDescription * desc = pango_font_description_from_string(FONT);
pango_layout_set_font_description(layout, desc);