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Manual doublebuffering. Hopefully fixes flickering.

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itycodes 2023-02-26 10:04:53 +01:00
parent 0d40df404e
commit 725ad80d90
1 changed files with 36 additions and 27 deletions
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59
main.c
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@ -12,7 +12,7 @@
*/ */
// -------------- // --------------
// TextBar v0.1.1 // TextBar v0.1.2
// -------------- // --------------
// Usage: <text generator> | textbar | <input handler> // Usage: <text generator> | textbar | <input handler>
// //
@ -23,9 +23,6 @@
// Line buffered // Line buffered
// Prints all mouse clicks to stdout // Prints all mouse clicks to stdout
// In the format of `X Y` (without the '`') // In the format of `X Y` (without the '`')
//
// When the X server is lagging, the bar will set the background color to 0,0,0,0 for a single frame in a given frequency. The more X is lagging, the more frequently it will do so.
// I swear this is an intented feature.
#include <pthread.h> #include <pthread.h>
@ -48,7 +45,9 @@
Display* dpy; Display* dpy;
Window win; Window win;
cairo_surface_t* sfc; cairo_surface_t* sfc;
cairo_surface_t* sfc2;
cairo_t* ctx; cairo_t* ctx;
cairo_t* ctx2;
char text[256] = {0}; char text[256] = {0};
char text_other[256] = {0}; char text_other[256] = {0};
int width; int width;
@ -102,35 +101,46 @@ void init() {
XMapWindow(dpy, win); XMapWindow(dpy, win);
sfc = cairo_xlib_surface_create(dpy, win, visualinfo.visual, DisplayWidth(dpy, screen), HEIGHT); sfc = cairo_xlib_surface_create(dpy, win, visualinfo.visual, DisplayWidth(dpy, screen), HEIGHT);
sfc2 = cairo_surface_create_similar(sfc, CAIRO_CONTENT_COLOR_ALPHA, DisplayWidth(dpy, screen), HEIGHT);
ctx = cairo_create(sfc); ctx = cairo_create(sfc);
ctx2 = cairo_create(sfc2);
} }
pthread_mutex_t do_paint; pthread_mutex_t do_paint;
void paint(Display* dpy) { void paint(Display* dpy) {
if(!pthread_mutex_lock(&do_paint)) { if(!pthread_mutex_lock(&do_paint)) {
//cairo_set_source_rgba(ctx, 0.0, 0.0, 0.0, 0.0); // Clear
//cairo_set_operator(ctx, CAIRO_OPERATOR_SOURCE); cairo_set_source_rgba(ctx2, 0.0, 0.0, 0.0, 0.0);
//cairo_paint(ctx); cairo_set_operator(ctx2, CAIRO_OPERATOR_SOURCE);
//TODO: fix alpha cairo_paint(ctx2);
//NOTE: comment the following line if you do not use transparency. cairo_set_operator(ctx2, CAIRO_OPERATOR_OVER);
XClearWindow(dpy, win);
cairo_push_group(ctx); // Background
cairo_set_operator(ctx, CAIRO_OPERATOR_OVER); cairo_set_source_rgba(ctx2, BG_COLOR);
cairo_set_source_rgba(ctx, BG_COLOR); cairo_paint(ctx2);
cairo_paint(ctx);
cairo_move_to(ctx, FONT_SIZE / 2, FONT_POS); // Left text
cairo_select_font_face(ctx, FONT, CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL); cairo_move_to(ctx2, FONT_SIZE / 2, FONT_POS);
cairo_set_font_size(ctx, FONT_SIZE); cairo_select_font_face(ctx2, FONT, CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
cairo_set_source_rgba(ctx, FG_COLOR); cairo_set_font_size(ctx2, FONT_SIZE);
cairo_show_text(ctx, text); cairo_set_source_rgba(ctx2, FG_COLOR);
cairo_show_text(ctx2, text);
// Right text
cairo_text_extents_t extents; cairo_text_extents_t extents;
cairo_text_extents(ctx, text_other, &extents); cairo_text_extents(ctx2, text_other, &extents);
cairo_move_to(ctx, (width-extents.width) - FONT_SIZE / 2, FONT_POS); cairo_move_to(ctx2, (width-extents.width) - FONT_SIZE / 2, FONT_POS);
cairo_show_text(ctx, text_other); cairo_show_text(ctx2, text_other);
cairo_pop_group_to_source(ctx);
// Backbuffer -> Frontbuffer
cairo_set_source_surface(ctx, sfc2, 0, 0);
cairo_set_operator(ctx, CAIRO_OPERATOR_SOURCE);
cairo_paint(ctx); cairo_paint(ctx);
// Flushing
cairo_surface_flush(sfc); cairo_surface_flush(sfc);
XFlush(dpy); XFlush(dpy);
pthread_mutex_unlock(&do_paint); pthread_mutex_unlock(&do_paint);
} }
} }
@ -156,8 +166,7 @@ void x_loop() {
if(e.type == ButtonPress) { if(e.type == ButtonPress) {
printf("%d %d\n", e.xbutton.x, e.xbutton.y); printf("%d %d\n", e.xbutton.x, e.xbutton.y);
fflush(stdout); fflush(stdout);
} else } else if(e.type == ConfigureNotify) {
if(e.type == ConfigureNotify) {
cairo_xlib_surface_set_size(sfc, e.xconfigure.width, e.xconfigure.height); cairo_xlib_surface_set_size(sfc, e.xconfigure.width, e.xconfigure.height);
} else } else
if(e.type == Expose) { if(e.type == Expose) {